Roxen.git/server/etc/modules/RXML.pmod/module.pmod:9d2646cb3fda1b5a74faf24ec23c07de1ebf3d85

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5622 5623 5624 5625 5626 5627 5628 5629 5630 5631 5632 5633 5634 5635 5636 5637 5638 5639 5640 5641 5642 5643 5644 5645 5646 5647 5648 5649 5650 5651 5652 5653 5654 5655 5656 5657 5658 5659 5660 5661 5662 5663 5664 5665 5666 5667 5668 5669 5670 5671 5672 5673 5674 5675 5676 5677 5678 5679 5680 5681 5682 5683 5684 5685 5686 5687 5688 5689 5690 5691 5692 5693 5694 5695 5696 5697 5698 5699 5700 5701 5702 5703 5704 5705 5706 5707 5708 5709 5710 5711 5712 5713 5714 5715 5716 5717 5718 5719 5720 5721 5722 5723 5724 5725 5726 5727 5728 5729 5730 5731 5732 5733 5734 5735 5736 5737 5738 5739 5740 5741 5742 5743 5744 5745 5746 5747 5748 5749 5750 5751 5752 5753 // $Id: module.pmod,v 1.166 2001/06/13 13:51:49 mast Exp $ // Kludge: Must use "RXML.refs" somewhere for the whole module to be // loaded correctly. static object Roxen; class RequestID { }; //(!) FIXME: This was not legal autodoc; do we need some form of markup //(!) to do what it tried to do? I'm not sure I fully understand what the //(!) (now) (!) marked lines were meant to do; if it's just a comment //(!) worth reading when browsing the source, please remove this and turn //(!) these comments into normal "//" comments. / jhs //! RXML parser and compiler framework. //! //! Created 1999-07-30 by Martin Stjernholm. //! //! API stability notes: //! //! The API in this file regarding the global functions and the Tag, //! TagSet, Context, Frame and Type classes and their descendants is //! intended to not change in incompatible ways. There are however //! some areas where incompatible changes still must be expected: //! //! @list ul //! @item //! The namespace handling will likely change to conform to XML //! namespaces. The currently implemented system is inadequate then //! and will probably be removed. //! @item //! The semantics for caching and reuse of Frame objects is //! deliberatily documented vaguely (see the class doc for the //! Frame class). The currently implemented behavior will change //! when the cache system becomes reality. So never assume that //! you'll always get fresh Frame instances every time a tag is //! evaluated. //! @item //! The parser currently doesn't stream data according to the //! interface for streaming tags (but the implementation still //! follows the documented API for it). Therefore there's a risk //! that incompatible changes must be made in it due to design bugs //! when it's tested out. That is considered very unlikely, though. //! @item //! The type system will be developed further, and the API in the //! Type class might change as advanced types gets implemented. //! Don't make assumptions about undocumented behavior. Declare //! data properly with the types RXML.t_xml, RXML.t_html and //! RXML.t_text to let the parser handle the necessary conversions //! instead of doing it yourself. Try to avoid implementing types. //! @item //! Various utilities have FIXME's in their documentation. Needless //! to say they don't work as documented yet, and the doc should be //! considered as ideas only; it might work differently when it's //! actually implemented. //! @endlist //! //! @note //! The API for parsers, p-code evaluators etc is not part of the //! "official" API. (The syntax _parsed_ by the currently implemented //! parsers is well defined, of course.) //#pragma strict_types // Disabled for now since it doesn't work well enough. #include <config.h> #include <request_trace.h> #define MAGIC_HELP_ARG // #define OBJ_COUNT_DEBUG // #define RXML_VERBOSE // #define PROFILE_PARSER #ifdef RXML_OBJ_DEBUG # define MARK_OBJECT \ Debug.ObjectMarker __object_marker = Debug.ObjectMarker (this_object()) # define MARK_OBJECT_ONLY \ Debug.ObjectMarker __object_marker = Debug.ObjectMarker (0) #else # define MARK_OBJECT # define MARK_OBJECT_ONLY #endif #ifdef OBJ_COUNT_DEBUG // This debug mode gives every object a unique number in the // _sprintf() string. # ifndef RXML_OBJ_DEBUG # undef MARK_OBJECT # undef MARK_OBJECT_ONLY # define MARK_OBJECT \ mapping __object_marker = (["count": ++all_constants()->_obj_count]) # define MARK_OBJECT_ONLY \ mapping __object_marker = (["count": ++all_constants()->_obj_count]) # endif # define OBJ_COUNT (__object_marker ? "[" + __object_marker->count + "]" : "") #else # define OBJ_COUNT "" #endif #ifdef PROFILE_PARSER #define PROFILE_ENTER(ctx, what) do { \ ctx->profile[what] -= gethrtime(); \ /* if (what == "rxml internal") trace (1); */ \ } while (0) #define PROFILE_LEAVE(ctx, what) do { \ /* if (what == "rxml internal") trace (0); */ \ ctx->profile[what] += gethrtime(); \ } while (0) #define PROFILE_SWITCH(ctx, from, to) do { \ /* if (from == "rxml internal") trace (0); */ \ int now = gethrtime(); \ ctx->profile[from] += now; \ ctx->profile[to] -= now; \ /* if (to == "rxml internal") trace (1); */ \ } while (0) #else # define PROFILE_ENTER(ctx, what) do ; while (0) # define PROFILE_LEAVE(ctx, what) do ; while (0) # define PROFILE_SWITCH(ctx, from, to) do ; while (0) #endif #ifdef RXML_VERBOSE # define TAG_DEBUG_TEST(flags) 1 #elif defined (DEBUG) # define TAG_DEBUG_TEST(flags) ((flags) & FLAG_DEBUG) #else # define TAG_DEBUG_TEST(flags) 0 #endif #ifdef DEBUG # define TAG_DEBUG(frame, msg, args...) \ (TAG_DEBUG_TEST(frame->flags) && report_debug ("%O: " + (msg), (frame), args), 0) # define DO_IF_DEBUG(code...) code #else # define TAG_DEBUG(frame, msg, args...) 0 # define DO_IF_DEBUG(code...) #endif #ifdef MODULE_DEBUG # define DO_IF_MODULE_DEBUG(code...) code #else # define DO_IF_MODULE_DEBUG(code...) #endif #define HASH_INT2(m, n) (n < 65536 ? (m << 16) + n : sprintf ("%x,%x", m, n)) // Use defines since typedefs doesn't work in soft casts yet. #define SCOPE_TYPE mapping(string:mixed)|object(Scope) #define UNWIND_STATE mapping(string|object:mixed|array) #define EVAL_ARGS_FUNC function(Context:mapping(string:mixed)) class Tag //! Interface class for the static information about a tag. { constant is_RXML_Tag = 1; //(!) Interface: //! @decl string name; //! //! The name of the tag. Required and considered constant. /*extern*/ int flags; //! Various bit flags that affect parsing; see the FLAG_* constants. //! @[RXML.Frame.flags] is initialized from this. mapping(string:Type) req_arg_types = ([]); mapping(string:Type) opt_arg_types = ([]); //! The names and types of the required and optional arguments. If a //! type specifies a parser, it'll be used on the argument value. //! Note that the order in which arguments are parsed is arbitrary. Type def_arg_type = t_text (PEnt); //! The type used for arguments that isn't present in neither //! @[req_arg_types] nor @[opt_arg_types]. This default is a parser //! that only parses XML-style entities. Type content_type = t_same (PXml); //! The handled type of the content, if the tag gets any. //! //! The default is the special type @[RXML.t_same], which means the //! type is taken from the effective type of the result. The //! argument to the type is @[RXML.PXml], which causes that parser, //! i.e. the standard XML parser, to be used to read it. The effect //! is that the content is preparsed with XML syntax. Use no parser, //! or @[RXML.PNone], to get the raw text. //! //! Note: You probably want to change this to @[RXML.t_text] //! (without parser) if the tag is a processing instruction (see //! @[FLAG_PROC_INSTR]). array(Type) result_types = ({t_xml, t_html, t_text}); //! The possible types of the result, in order of precedence. If a //! result type has a parser, it'll be used to parse any strings in //! the exec array returned from @[Frame.do_enter] and similar //! callbacks. //! //! When the tag is used in content of some type, the content type //! may be a supertype of any type in @[result_types], but it may //! also be a subtype of any of them. The tag must therefore be //! prepared to produce result of more specific types than those //! declared here. I.e. the extreme case, @[RXML.t_any], means that //! this tag takes the responsibility to produce result of any type //! that's asked for, not that it has the liberty to produce results //! of any type it chooses. //! @decl program Frame; //! @decl object(Frame) Frame(); //! //! This program/function is used to clone the objects used as //! frames. A frame object must (in practice) inherit @[RXML.Frame]. //! (It can, of course, be any function that requires no arguments //! and returns a new frame object.) This is not used for plugin //! tags. //! @decl string plugin_name; //! //! If this is defined, this is a so-called plugin tag. That means //! it plugs in some sort of functionality in another @[RXML.Tag] //! object instead of handling the actual tags of its own. It works //! as follows: //! //! @list ul //! @item //! Instead of installing the callbacks for this tag, the parser //! uses another registered "socket" @[Tag] object that got the //! same name as this one. Socket tags have the @[FLAG_SOCKET_TAG] //! flag set to signify that they accept plugins. //! @item //! When the socket tag is parsed or evaluated, it can get the //! @[Tag] objects for the registered plugins with the function //! @[Frame.get_plugins]. It's then up to the socket tag to use //! the plugins according to some API it defines. //! @item //! @[plugin_name] is the name of the plugin. It's used as index //! in the mapping that the @[Frame.get_plugins] returns. //! @item //! The plugin tag is registered in the tag set with the //! identifier @code{@[name] + "#" + @[plugin_name]@}. //! //! It overrides other plugin tags with that name according to //! the normal tag set rules, but, as said above, is never //! registered for actual parsing at all. //! //! It's undefined whether plugin tags override normal tags -- //! @tt{#@} should never be used in normal tag names. //! @item //! It's not an error to register a plugin for which there is no //! socket. Such plugins are simply ignored. //! @endlist //(!) Services: inline final object/*(Frame)HMM*/ `() (mapping(string:mixed) args, void|mixed content) //! Make an initialized frame for the tag. Typically useful when //! returning generated tags from e.g. @[RXML.Frame.do_process]. The //! argument values and the content are normally not parsed. { Tag this = this_object(); object/*(Frame)HMM*/ frame = ([function(:object/*(Frame)HMM*/)] this->Frame)(); frame->tag = this; frame->flags = flags; frame->args = args; frame->content = zero_type (content) ? nil : content; frame->result = nil; return frame; } int eval_args (mapping(string:mixed) args, void|int dont_throw, void|Context ctx, void|array(string) ignore_args) //! Parses and evaluates the tag arguments according to //! @[req_arg_types] and @[opt_arg_types]. The @[args] mapping //! contains the unparsed arguments on entry, and they get replaced //! by the parsed results. Arguments not mentioned in //! @[req_arg_types] or @[opt_arg_types] are evaluated with the default //! argument type, unless listed in @[ignore_args]. RXML errors, such //! as missing argument, are thrown if @[dont_throw] is zero or left //! out, otherwise zero is returned when any such error occurs. @[ctx] //! specifies the context to use; it defaults to the current context. { // Note: Code duplication in Frame._eval_args and Frame._prepare. mapping(string:Type) atypes = args & req_arg_types; if (sizeof (atypes) < sizeof (req_arg_types)) if (dont_throw) return 0; else { array(string) missing = sort (indices (req_arg_types - atypes)); parse_error ("Required " + (sizeof (missing) > 1 ? "arguments " + String.implode_nicely (missing) + " are" : "argument " + missing[0] + " is") + " missing.\n"); } atypes += args & opt_arg_types; #ifdef MODULE_DEBUG if (mixed err = catch { #endif foreach (indices (args) - ( ignore_args||({}) ), string arg) args[arg] = (atypes[arg] || def_arg_type)->eval ( args[arg], ctx); // Should not unwind. #ifdef MODULE_DEBUG }) { if (objectp (err) && ([object] err)->thrown_at_unwind) fatal_error ("Can't save parser state when evaluating arguments.\n"); throw_fatal (err); } #endif return 1; } //(!) Internals: #define MAKE_FRAME(_frame, _ctx, _parser, _args) \ make_new_frame: do { \ if (UNWIND_STATE ustate = _ctx->unwind_state) \ if (ustate[_parser]) { \ _frame = [object/*(Frame)HMM*/] ustate[_parser][0]; \ m_delete (ustate, _parser); \ if (!sizeof (ustate)) _ctx->unwind_state = 0; \ break make_new_frame; \ } \ _frame = `() (0, nil); \ DO_IF_DEBUG( \ if (_args && ([mapping] (mixed) _args)["-debug-tag-"]) { \ _frame->flags |= FLAG_DEBUG; \ m_delete (_args, "-debug-tag-"); \ } \ ); \ TAG_DEBUG (_frame, "New frame\n"); \ } while (0) #define EVAL_FRAME(_frame, _ctx, _parser, _type, _args, _content, _res) \ eval_frame: do { \ mixed err = catch { \ EVAL_ARGS_FUNC argfunc; \ if (!_frame->args) \ argfunc = _frame->_prepare (_ctx, _type, _args); \ _res = _frame->_eval (_ctx, _parser, _type, _content || ""); \ if (_parser->p_code) { \ _frame->args = argfunc; \ _parser->p_code->add (_frame); \ } \ break eval_frame; \ }; \ \ if (objectp (err) && ([object] err)->thrown_at_unwind) { \ UNWIND_STATE ustate = _ctx->unwind_state; \ if (!ustate) ustate = _ctx->unwind_state = ([]); \ DO_IF_DEBUG ( \ if (err != _frame) \ fatal_error ("Unexpected unwind object catched.\n"); \ if (ustate[_parser]) \ fatal_error ("Clobbering unwind state for parser.\n"); \ ); \ ustate[_parser] = ({_frame}); \ throw (_parser); \ } \ else { \ /* Will rethrow unknown errors. */ \ _ctx->handle_exception (err, _parser); \ _res = nil; \ } \ } while (0) final mixed handle_tag (TagSetParser parser, mapping(string:string) args, void|string content) // Callback for tag set parsers to handle tags. Note that this // function handles an unwind frame for the parser. { // Note: args may be zero when this is called for PI tags. Context ctx = parser->context; object/*(Frame)HMM*/ frame; MAKE_FRAME (frame, ctx, parser, args); if (!zero_type (frame->raw_tag_text)) frame->raw_tag_text = parser->raw_tag_text(); mixed result; EVAL_FRAME (frame, ctx, parser, parser->type, args, content, result); return result; } final array _p_xml_handle_tag (object/*(PXml)*/ parser, mapping(string:string) args, void|string content) { Type type = parser->type; if (type->handle_literals) parser->handle_literal(); else if (parser->p_code) parser->p_code_literal(); Context ctx = parser->context; object/*(Frame)HMM*/ frame; MAKE_FRAME (frame, ctx, parser, args); if (!zero_type (frame->raw_tag_text)) frame->raw_tag_text = parser->current_input(); mixed result; EVAL_FRAME (frame, ctx, parser, type, args, content, result); if (result != nil) { if (type->free_text && !parser->p_code) return ({result}); parser->add_value (result); } return ({}); } final array _p_xml_handle_pi_tag (object/*(PXml)*/ parser, string content) { Type type = parser->type; if (type->handle_literals) parser->handle_literal(); else if (parser->p_code) parser->p_code_literal(); sscanf (content, "%[ \t\n\r]%s", string ws, string rest); if (ws == "" && rest != "") { // The parser didn't match a complete name, so this is a false // alarm for an unknown PI tag. if (!type->free_text) return utils->unknown_pi_tag_error (parser, content); return 0; } Context ctx = parser->context; object/*(Frame)HMM*/ frame; MAKE_FRAME (frame, ctx, parser, 0); if (!zero_type (frame->raw_tag_text)) frame->raw_tag_text = parser->current_input(); mixed result; EVAL_FRAME (frame, ctx, parser, type, 0, content, result); if (result != nil) { if (type->free_text && !parser->p_code) return ({result}); parser->add_value (result); } return ({}); } MARK_OBJECT; string _sprintf() { return "RXML.Tag(" + [string] this_object()->name + (this_object()->plugin_name ? "#" + [string] this_object()->plugin_name : "") + ([int] this_object()->flags & FLAG_PROC_INSTR ? " [PI]" : "") + ")" + OBJ_COUNT; } } class TagSet //! Contains a set of tags. Tag sets can import other tag sets, and //! later changes in them are propagated. Parser instances (contexts) //! to parse data are created from this. @[TagSet] objects may //! somewhat safely be destructed explicitly; the tags in a destructed //! tag set will not be active in parsers that are instantiated later, //! but will work in current instances. Element (i.e. non-PI) tags and //! PI tags have separate namespaces. //! //! @note //! An @[RXML.Tag] object may not be registered in more than one tag //! set at the same time. { string name; //! Used for identification only. string prefix; //! A namespace prefix that may precede the tags. If it's zero, it's //! up to the importing tag set(s). A @tt{:@} is always inserted //! between the prefix and the tag name. //! //! @note //! This namespace scheme is not compliant with the XML namespaces //! standard. Since the intention is to implement XML namespaces at //! some point, this way of specifying tag prefixes will probably //! change. int prefix_req; //! The prefix must precede the tags. array(TagSet) imported = ({}); //! Other tag sets that will be used. The precedence is local tags //! first, then imported from left to right. It's not safe to //! destructively change entries in this array. function(Context:void) prepare_context; //! If set, this is a function that will be called before a new //! @[RXML.Context] object is taken into use. It'll typically //! prepare predefined scopes and variables. The functions will be //! called in order of precedence; highest last. int generation = 1; //! A number that is increased every time something changes in this //! object or in some tag set it imports. int id_number; //! Unique number identifying this tag set. static void create (string _name, void|array(Tag) _tags) //! { id_number = ++tag_set_count; name = _name; if (_tags) add_tags (_tags); #ifdef RXML_OBJ_DEBUG __object_marker->create (this_object()); #endif } void add_tag (Tag tag) //! { #ifdef MODULE_DEBUG if (!stringp (tag->name)) error ("Trying to register a tag %O without a name.\n", tag); if (!callablep (tag->Frame) && !tag->plugin_name) error ("Trying to register a tag %O without a Frame class or function.\n", tag); if (tag->name[..3] != "!--#" && // Ugly special case for SSI tags. replace (tag->name, "#<>& \t\n\r" / "", ({""}) * 8) != tag->name) error ("Invalid character(s) in name for tag %O.\n", tag); #endif if (tag->flags & FLAG_PROC_INSTR) { if (!proc_instrs) proc_instrs = ([]); if (tag->plugin_name) proc_instrs[tag->name + "#" + tag->plugin_name] = tag; else proc_instrs[tag->name] = tag; } else if (tag->plugin_name) tags[tag->name + "#" + tag->plugin_name] = tag; else tags[tag->name] = tag; changed(); } void add_tags (array(Tag) _tags) //! { foreach (_tags, Tag tag) { #ifdef MODULE_DEBUG if (!stringp (tag->name)) error ("Trying to register a tag %O without a name.\n", tag); if (!callablep (tag->Frame)&& !tag->plugin_name) error ("Trying to register a tag %O without a Frame class or function.\n", tag); if (tag->name[..3] != "!--#" && // Ugly special case for SSI tags. replace (tag->name, "#<>& \t\n\r" / "", ({""}) * 8) != tag->name) error ("Invalid character(s) in name for tag %O.\n", tag); #endif if (tag->flags & FLAG_PROC_INSTR) { if (!proc_instrs) proc_instrs = ([]); if (tag->plugin_name) proc_instrs[tag->name + "#" + tag->plugin_name] = tag; else proc_instrs[tag->name] = tag; } else if (tag->plugin_name) tags[tag->name + "#" + tag->plugin_name] = tag; else tags[tag->name] = tag; } changed(); } void remove_tag (string|Tag tag, void|int proc_instr) //! If tag is an @[RXML.Tag] object, it's removed if this tag set //! contains it. If tag is a string, the tag with that name is //! removed. In the latter case, if @[proc_instr] is nonzero the set //! of PI tags is searched, else the set of normal element tags. { if (stringp (tag)) if (proc_instr) { if (proc_instrs) m_delete (proc_instrs, tag); } else m_delete (tags, tag); else { string n; if (tag->flags & FLAG_PROC_INSTR) { if (proc_instrs && !zero_type (n = search (tags, [object(Tag)] tag))) m_delete (proc_instrs, n); } else if (!zero_type (n = search (tags, [object(Tag)] tag))) m_delete (tags, n); } changed(); } local Tag get_local_tag (string name, void|int proc_instr) //! Returns the @[RXML.Tag] object for the given name in this tag //! set, if any. If @[proc_instr] is nonzero the set of PI tags is //! searched, else the set of normal element tags. { return proc_instr ? proc_instrs && proc_instrs[name] : tags[name]; } local array(Tag) get_local_tags() //! Returns all the @[RXML.Tag] objects in this tag set. { array(Tag) res = values (tags); if (proc_instrs) res += values (proc_instrs); return res; } local Tag get_tag (string name, void|int proc_instr) //! Returns the @[RXML.Tag] object for the given name, if any, //! that's defined by this tag set (including its imported tag //! sets). If @[proc_instr] is nonzero the set of PI tags is //! searched, else the set of normal element tags. { if (object(Tag) def = get_local_tag (name, proc_instr)) return def; foreach (imported, TagSet tag_set) if (object(Tag) tag = [object(Tag)] tag_set->get_tag (name, proc_instr)) return tag; return 0; } local int has_tag (Tag tag) //! Returns nonzero if the given tag is contained in this tag set //! (including its imported tag sets). { return !!get_tag (tag->name, tag->flags & FLAG_PROC_INSTR); } local multiset(string) get_tag_names() //! Returns the names of all non-PI tags that this tag set defines. { return `| ((multiset) indices (tags), @imported->get_tag_names()); } local multiset(string) get_proc_instr_names() //! Returns the names of all PI tags that this tag set defines. { return `| (proc_instrs ? (multiset) indices (proc_instrs) : (<>), @imported->get_proc_instr_names()); } local Tag get_overridden_tag (Tag overrider) //! Returns the tag definition that the given one overrides, or zero //! if none. { if (!mappingp (overridden_tag_lookup)) overridden_tag_lookup = set_weak_flag (([]), 1); Tag tag; if (zero_type (tag = overridden_tag_lookup[overrider])) { string overrider_name = overrider->plugin_name ? overrider->plugin_name + "#" + overrider->name : overrider->name; tag = overridden_tag_lookup[overrider] = overrider->flags & FLAG_PROC_INSTR ? find_overridden_proc_instr (overrider, overrider_name) : find_overridden_tag (overrider, overrider_name); } return tag; } local array(Tag) get_overridden_tags (string name, void|int proc_instr) //! Returns all tag definitions for the given name, i.e. including //! the overridden ones. A tag to the left overrides one to the //! right. If @[proc_instr] is nonzero the set of PI tags is //! searched, else the set of normal element tags. { if (object(Tag) def = get_local_tag (name, proc_instr)) return ({def}) + imported->get_overridden_tags (name, proc_instr) * ({}); else return imported->get_overridden_tags (name, proc_instr) * ({}); } void add_string_entities (mapping(string:string) entities) //! Adds a set of entity replacements that are used foremost by the //! @[RXML.PXml] parser to decode simple entities like @tt{&@}. //! The indices are the entity names without @tt{&@} and @tt{;@}. { if (string_entities) string_entities |= entities; else string_entities = entities + ([]); changed(); } void clear_string_entities() //! { string_entities = 0; changed(); } local mapping(string:string) get_string_entities() //! Returns the set of entity replacements, including those from //! imported tag sets. { if (string_entities) return `+(@imported->get_string_entities(), string_entities); else return `+(@imported->get_string_entities(), ([])); } local mapping(string:Tag) get_plugins (string name, void|int proc_instr) //! Returns the registered plugins for the given tag name. If //! @[proc_instr] is nonzero, the function searches for processing //! instruction plugins, otherwise it searches for plugins to normal //! element tags. Don't be destructive on the returned mapping. { mapping(string:Tag) res; if (proc_instr) { if (!pi_plugins) pi_plugins = ([]); if ((res = pi_plugins[name])) return res; low_get_pi_plugins (name + "#", res = ([])); return pi_plugins[name] = res; } else { if (!plugins) plugins = ([]); if ((res = plugins[name])) return res; low_get_plugins (name + "#", res = ([])); return plugins[name] = res; } } local int has_effective_tags (TagSet tset) //! This one deserves some explanation. { return tset == top_tag_set && !got_local_tags; } local mixed `->= (string var, mixed val) { switch (var) { case "imported": if (!val) return val; // Pike can call us with 0 as part of an optimization. filter (imported, "dont_notify", changed); imported = [array(TagSet)] val; imported->do_notify (changed); top_tag_set = sizeof (imported) && imported[0]; break; default: ::`->= (var, val); } changed(); return val; } local mixed `[]= (string var, mixed val) {return `->= (var, val);} Parser `() (Type top_level_type, void|RequestID id) //! Creates a new context for parsing content of the specified type, //! and returns the parser object for it. id is put into the //! context. { Context ctx = Context (this_object(), id); if (!prepare_funs) prepare_funs = get_prepare_funs(); (prepare_funs -= ({0})) (ctx); return ctx->new_parser (top_level_type); } void changed() //! Should be called whenever something is changed. Done //! automatically most of the time, however. { generation++; prepare_funs = 0; overridden_tag_lookup = 0; plugins = pi_plugins = 0; (notify_funcs -= ({0}))(); set_weak_flag (notify_funcs, 1); got_local_tags = sizeof (tags) || (proc_instrs && sizeof (proc_instrs)); } function(Backtrace,Type:string) handle_run_error = lambda (Backtrace err, Type type) //! Formats the run error backtrace. // This wrapper function however only search for a // "real" handle_run_error function. { string result; foreach(imported, TagSet tag_set) { result = tag_set->handle_run_error(err, type); if(result) return result; } return 0; }; function(Backtrace,Type:string) handle_parse_error = lambda (Backtrace err, Type type) //! Formats the parse error backtrace. // This wrapper function however only search for a // "real" handle_parse_error function. { string result; foreach(imported, TagSet tag_set) { result = tag_set->handle_parse_error(err, type); if(result) return result; } return 0; }; //(!) Internals: void do_notify (function(:void) func) { notify_funcs |= ({func}); set_weak_flag (notify_funcs, 1); } void dont_notify (function(:void) func) { notify_funcs -= ({func}); set_weak_flag (notify_funcs, 1); } void destroy() { catch (changed()); } static mapping(string:Tag) tags = ([]), proc_instrs; // Static since we want to track changes in these. static mapping(string:string) string_entities; // Used by e.g. PXml to hold normal entities that should be replaced // during parsing. static TagSet top_tag_set; // The imported tag set with the highest priority. static int got_local_tags; // Nonzero if there are local element tags or PI tags. static array(function(:void)) notify_funcs = ({}); // Weak (when nonempty). static array(function(Context:void)) prepare_funs; /*static*/ array(function(Context:void)) get_prepare_funs() { if (prepare_funs) return prepare_funs; array(function(Context:void)) funs = ({}); for (int i = sizeof (imported) - 1; i >= 0; i--) funs += imported[i]->get_prepare_funs(); if (prepare_context) funs += ({prepare_context}); // We don't cache in prepare_funs; do that only at the top level. return funs; } static mapping(Tag:Tag) overridden_tag_lookup; /*static*/ Tag find_overridden_tag (Tag overrider, string overrider_name) { if (tags[overrider_name] == overrider) { foreach (imported, TagSet tag_set) if (object(Tag) overrider = tag_set->get_tag (overrider_name)) return overrider; } else { int found = 0; foreach (imported, TagSet tag_set) if (object(Tag) subtag = tag_set->get_tag (overrider_name)) if (found) return subtag; else if (subtag == overrider) if ((subtag = tag_set->find_overridden_tag ( overrider, overrider_name))) return subtag; else found = 1; } return 0; } /*static*/ Tag find_overridden_proc_instr (Tag overrider, string overrider_name) { if (proc_instrs && proc_instrs[overrider_name] == overrider) { foreach (imported, TagSet tag_set) if (object(Tag) overrider = tag_set->get_tag (overrider_name, 1)) return overrider; } else { int found = 0; foreach (imported, TagSet tag_set) if (object(Tag) subtag = tag_set->get_tag (overrider_name, 1)) if (found) return subtag; else if (subtag == overrider) if ((subtag = tag_set->find_overridden_proc_instr ( overrider, overrider_name))) return subtag; else found = 1; } return 0; } void call_prepare_funs (Context ctx) // Kludge function used from rxml.pike. { if (!prepare_funs) prepare_funs = get_prepare_funs(); (prepare_funs -= ({0})) (ctx); } static mapping(string:mapping(string:Tag)) plugins, pi_plugins; /*static*/ void low_get_plugins (string prefix, mapping(string:Tag) res) { for (int i = sizeof (imported) - 1; i >= 0; i--) imported[i]->low_get_plugins (prefix, res); foreach (indices (tags), string name) if (name[..sizeof (prefix) - 1] == prefix) { Tag tag = tags[name]; if (tag->plugin_name) res[[string] tag->plugin_name] = tag; } // We don't cache in plugins; do that only at the top level. } /*static*/ void low_get_pi_plugins (string prefix, mapping(string:Tag) res) { for (int i = sizeof (imported) - 1; i >= 0; i--) imported[i]->low_get_pi_plugins (prefix, res); if (proc_instrs) foreach (indices (proc_instrs), string name) if (name[..sizeof (prefix) - 1] == prefix) { Tag tag = proc_instrs[name]; if (tag->plugin_name) res[[string] tag->plugin_name] = tag; } // We don't cache in pi_plugins; do that only at the top level. } string _sprintf() { return sprintf ("RXML.TagSet(%O,%d)%s", name, id_number, OBJ_COUNT); } MARK_OBJECT_ONLY; } TagSet empty_tag_set; //! The empty tag set. class Value //! Interface for objects used as variable values that are evaluated //! when referenced. { mixed rxml_var_eval (Context ctx, string var, string scope_name, void|Type type) //! This is called to get the value of the variable. @[ctx], @[var] //! and @[scope_name] are set to where this @[Value] object was //! found. Note that @[scope_name] can be on the form //! @tt{"scope.index1.index2..."@} when this object was encountered //! through subindexing. Either @[RXML.nil] or the undefined value //! may be returned if the variable doesn't have a value. //! //! If the @[type] argument is given, it's the type the returned //! value should have. If the value can't be converted to that type, //! an RXML error should be thrown. If you don't want to do any //! special handling of this, it's enough to call //! @code{@[type]->encode(value)@}, since the encode functions does //! just that. //! //! Some design discussion follows to justify the last paragraph; //! there are no more interface rules below. //! //! It may seem like forcing a lot of overhead upon the //! implementations having to call encode functions, but that's //! really not the case. In the case when a type check and //! conversion is wanted, i.e. when @[type] isn't zero, that work //! have to be done somewhere anyway, so letting the producer of the //! value do it instead of the caller both improves the chances for //! doing optimizations and gives more power to the producer. //! //! By using knowledge about the actual value, the producer can in //! many cases avoid the call to the encode function. A typical case //! is when the value is known to be an arbitrary literal string //! (not zero), which is preferably optimized like this: //! //! @example //! return type && type != RXML.t_text ? //! type->encode (my_string, RXML.t_text) : my_string; //! @endexample //! //! Also, by letting the producer know the type context of the value //! and handle the type conversion, it's possible for the producer //! to adapt the value according to the context it'll be used in, //! e.g. to return a powerful object if no type conversion is //! wanted, a simple text representation of it when the type is //! @[RXML.t_text], and a more nicely formatted representation when //! it's @[RXML.t_html]. //! //! @note //! The @[type] argument being @tt{void|Type@} means that the caller //! is free to leave out that argument, not that the function //! implementor is free to ignore it. { mixed val = rxml_const_eval (ctx, var, scope_name, type); ctx->set_var(var, val, scope_name); return val; } mixed rxml_const_eval (Context ctx, string var, string scope_name, void|Type type); //! If the variable value is the same throughout the life of the //! context, this method should be used instead of @[rxml_var_eval]. string _sprintf() {return "RXML.Value";} } class Scope //! Interface for objects that emulate a scope mapping. //! //! @note //! The @tt{scope_name@} argument to the functions can be on the form //! @tt{"scope.index1.index2..."@} when this object was encountered //! through subindexing. { mixed `[] (string var, void|Context ctx, void|string scope_name, void|Type type) //! Called to get the value of a variable in the scope. @[var] is //! the name of it, @[ctx] and @[scope_name] are set to where this //! @[Scope] object was found. Either @[RXML.nil] or the undefined //! value may be returned if the variable doesn't exist in the //! scope. //! //! If the @[type] argument is given, it's the type the returned //! value should have, unless it's an object which implements //! @[Value.rxml_var_eval]. If the value can't be converted to that //! type, an RXML error should be thrown. If you don't want to do //! any special handling of this, it's enough to call //! @tt{@[type]->encode(value)@}, since the encode functions does //! just that. See @[Value.rxml_var_eval] for more discussion about //! this. //! //! @note //! The @[type] argument being @tt{void|Type@} means that the caller //! is free to leave out that argument, not that the function //! implementor is free to ignore it. {parse_error ("Cannot query variable" + _in_the_scope (scope_name) + ".\n");} mixed `[]= (string var, mixed val, void|Context ctx, void|string scope_name) //! Called to set the value of a variable in the scope. @[var] is //! the name of it, @[ctx] and @[scope_name] are set to where this //! @[Scope] object was found. //! //! An RXML error may be thrown if the value is not acceptable for //! the variable. It's undefined what happens if a variable is set //! to @[RXML.nil]; it should be avoided. {parse_error ("Cannot set variable" + _in_the_scope (scope_name) + ".\n");} array(string) _indices (void|Context ctx, void|string scope_name) //! Called to get a list of all defined variables in the scope. //! @[ctx] and @[scope_name] are set to where this @[Scope] object //! was found. //! //! There's no guarantee that the returned variable names produce a //! value (i.e. neither @[RXML.nil] nor the undefined value) when //! indexed. {parse_error ("Cannot list variables" + _in_the_scope (scope_name) + ".\n");} void _m_delete (string var, void|Context ctx, void|string scope_name) //! Called to delete a variable in the scope. @[var] is the name of //! it, @[ctx] and @[scope_name] are set to where this @[Scope] //! object was found. { if (m_delete != local::m_delete) m_delete (var, ctx, scope_name); // For compatibility with 2.1. else parse_error ("Cannot delete variable" + _in_the_scope (scope_name) + ".\n"); } void m_delete (string var, void|Context ctx, void|string scope_name) // For compatibility with 2.1. {_m_delete (var, ctx, scope_name);} private string _in_the_scope (string scope_name) { if (scope_name) if (scope_name != "_") return " in the scope " + scope_name; else return " in the current scope"; else return ""; } string _sprintf() {return "RXML.Scope";} } class Context //! A parser context. This contains the current variable bindings and //! so on. The current context can always be retrieved with //! @[RXML.get_context]. //! //! @note //! Don't store pointers to this object since that will likely //! introduce circular references. It can be retrieved easily through //! @[RXML.get_context]. { Frame frame; //! The currently evaluating frame. int frame_depth; //! Number of frames currently on the frame stack. int max_frame_depth = 100; //! Maximum number of frames allowed on the frame stack. RequestID id; //! int type_check; //! Whether to do type checking. int error_count; //! Number of RXML errors that has occurred. TagSet tag_set; //! The current tag set that will be inherited by subparsers. #ifdef OLD_RXML_COMPAT int compatible_scope = 0; //! If set, the @tt{user_*_var@} functions access the variables in //! the scope "form" by default, and there's no subindex splitting //! or ".." decoding is done (see @[parse_user_var]). //! //! @note //! This is only present when the @tt{OLD_RXML_COMPAT@} define is //! set. #endif #ifdef PROFILE_PARSER mapping(string:int) profile = ([]); #endif array(string|int) parse_user_var (string var, void|string|int scope_name) //! Parses the var string for scope and/or subindexes according to //! the RXML rules, e.g. @tt{"scope.var.1.foo"@}. Returns an array //! where the first entry is the scope, and the remaining entries //! are the list of indexes. If @[scope_name] is a string, it's used //! as the scope and the var string is only used for subindexes. A //! default scope is chosen as appropriate if var cannot be split, //! unless @[scope_name] is a nonzero integer in which case it's //! returned in the scope position in the array (useful to detect //! whether @[var] actually was splitted or not). //! //! @tt{".."@} in the var string quotes a literal @tt{"."@}, e.g. //! @tt{"yow...cons..yet"@} is separated into @tt{"yow."@} and //! @tt{"cons.yet"@}. Any subindex that can be parsed as a signed //! integer is converted to it. Note that it doesn't happen for the //! first index, since a variable in a scope always is a string. { #ifdef OLD_RXML_COMPAT if (compatible_scope && !intp(scope_name)) return ({scope_name || "form", var}); #endif array(string|int) splitted; if(has_value(var, "..")) { // The \0 stuff is really here for a reason: The _only_ special // character is '.'. string coded = replace (var, "\0", "\0\0"); if (coded != var) splitted = map (replace (coded, "..", "\0p") / ".", replace, ({"\0p", "\0\0"}), ({".", "\0"})); else splitted = map (replace (var, "..", "\0") / ".", replace, "\0", "."); } else splitted = var / "."; if (stringp (scope_name)) splitted = ({scope_name}) + splitted; else if (sizeof (splitted) == 1) splitted = ({scope_name || "_"}) + splitted; for (int i = 2; i < sizeof (splitted); i++) if (sscanf (splitted[i], "%d%*c", int d) == 1) splitted[i] = d; return splitted; } local mixed get_var (string|array(string|int) var, void|string scope_name, void|Type want_type) //! Returns the value of the given variable in the specified scope, //! or the current scope if none is given. Returns undefined (zero //! with zero type 1) if there's no such variable (or it's //! @[RXML.nil]). //! //! If @[var] is an array, it's used to successively index the value //! to get subvalues (see @[rxml_index] for details). //! //! If the @[want_type] argument is set, the result value is //! converted to that type with @[Type.encode]. If the value can't //! be converted, an RXML error is thrown. { #ifdef MODULE_DEBUG if (arrayp (var) ? !sizeof (var) : !stringp (var)) fatal_error ("Invalid variable specifier.\n"); #endif if (!scope_name) scope_name = "_"; if (SCOPE_TYPE vars = scopes[scope_name]) return rxml_index (vars, var, scope_name, this_object(), want_type); else if (scope_name == "_") parse_error ("No current scope.\n"); else parse_error ("Unknown scope %O.\n", scope_name); } mixed user_get_var (string var, void|string scope_name, void|Type want_type) //! As @[get_var], but parses the var string for scope and/or //! subindexes, e.g. @tt{"scope.var.1.foo"@} (see @[parse_user_var] //! for details). //! //! @note //! This is intended for situations where you get a variable //! reference on the dot form in e.g. user input. In other cases, //! when the scope and variable is known, it's more efficient to use //! @[get_var]. { if(!var || !sizeof(var)) return ([])[0]; array(string|int) splitted = parse_user_var (var, scope_name); return get_var (splitted[1..], splitted[0], want_type); } local mixed set_var (string|array(string|int) var, mixed val, void|string scope_name) //! Sets the value of a variable in the specified scope, or the //! current scope if none is given. Returns @[val]. //! //! If @[var] is an array, it's used to successively index the value //! to get subvalues (see @[rxml_index] for details). { #ifdef MODULE_DEBUG if (arrayp (var) ? !sizeof (var) : !stringp (var)) fatal_error ("Invalid variable specifier.\n"); #endif if (!scope_name) scope_name = "_"; if (SCOPE_TYPE vars = scopes[scope_name]) { string|int index; if (arrayp (var)) if (sizeof (var) > 1) { index = var[-1]; var = var[..sizeof (var) - 1]; vars = rxml_index (vars, var, scope_name, this_object()); scope_name += "." + (array(string)) var * "."; } else index = var[0]; else index = var; if (objectp (vars) && vars->`[]=) return ([object(Scope)] vars)->`[]= (index, val, this_object(), scope_name); else if (mappingp (vars) || multisetp (vars)) return vars[index] = val; else if (arrayp (vars)) if (intp (index) && index) if ((index < 0 ? -index : index) > sizeof (vars)) parse_error( "Index %d out of range for array of size %d in %s.\n", index, sizeof (val), scope_name ); else if (index < 0) return vars[index] = val; else return vars[index - 1] = val; else parse_error( "Cannot index the array in %s with %O.\n", scope_name, index ); else parse_error ("%s is %O which cannot be indexed with %O.\n", scope_name, vars, index); } else if (scope_name == "_") parse_error ("No current scope.\n"); else parse_error ("Unknown scope %O.\n", scope_name); } mixed user_set_var (string var, mixed val, void|string scope_name) //! As @[set_var], but parses the var string for scope and/or //! subindexes, e.g. @tt{"scope.var.1.foo"@} (see @[parse_user_var] //! for details). //! //! @note //! This is intended for situations where you get a variable //! reference on the dot form in e.g. user input. In other cases, //! when the scope and variable is known, it's more efficient to use //! @[set_var]. { if(!var || !sizeof(var)) parse_error ("No variable specified.\n"); array(string|int) splitted = parse_user_var (var, scope_name); return set_var(splitted[1..], val, splitted[0]); } local void delete_var (string|array(string|int) var, void|string scope_name) //! Removes a variable in the specified scope, or the current scope //! if none is given. //! //! If @[var] is an array, it's used to successively index the value //! to get subvalues (see @[rxml_index] for details). { #ifdef MODULE_DEBUG if (arrayp (var) ? !sizeof (var) : !stringp (var)) fatal_error ("Invalid variable specifier.\n"); #endif if (!scope_name) scope_name = "_"; if (SCOPE_TYPE vars = scopes[scope_name]) { if (arrayp (var)) if (sizeof (var) > 1) { string|int last = var[-1]; var = var[..sizeof (var) - 1]; vars = rxml_index (vars, var, scope_name, this_object()); scope_name += "." + (array(string)) var * "."; var = last; } else var = var[0]; if (objectp (vars) && vars->_m_delete) ([object(Scope)] vars)->_m_delete (var, this_object(), scope_name); else if (mappingp (vars)) m_delete ([mapping(string:mixed)] vars, var); else if (multisetp (vars)) vars[var] = 0; else parse_error ("Cannot remove the index %O from the %t in %s.\n", var, vars, scope_name); } else if (scope_name == "_") parse_error ("No current scope.\n"); else parse_error ("Unknown scope %O.\n", scope_name); } void user_delete_var (string var, void|string scope_name) //! As @[delete_var], but parses the var string for scope and/or //! subindexes, e.g. @tt{"scope.var.1.foo"@} (see @[parse_user_var] //! for details). //! //! @note //! This is intended for situations where you get a variable //! reference on the dot form in e.g. user input. In other cases, //! when the scope and variable is known, it's more efficient to use //! @[delete_var]. { if(!var || !sizeof(var)) return; array(string|int) splitted = parse_user_var (var, scope_name); delete_var(splitted[1..], splitted[0]); } array(string) list_var (void|string scope_name) //! Returns the names of all variables in the specified scope, or //! the current scope if none is given. { if (SCOPE_TYPE vars = scopes[scope_name || "_"]) if (objectp (vars)) return ([object(Scope)] vars)->_indices (this_object(), scope_name || "_"); else return indices ([mapping(string:mixed)] vars); else if ((<0, "_">)[scope_name]) parse_error ("No current scope.\n"); else parse_error ("Unknown scope %O.\n", scope_name); } array(string) list_scopes() //! Returns the names of all defined scopes. { return indices (scopes) - ({"_"}); } int exist_scope (void|string scope_name) //! { return !!scopes[scope_name || "_"]; } void add_scope (string scope_name, SCOPE_TYPE vars) //! Adds or replaces the specified scope at the global level. A //! scope can be a mapping or an @[RXML.Scope] object. A global //! @tt{"_"@} scope may also be defined this way. { if (scopes[scope_name]) if (scope_name == "_") { array(SCOPE_TYPE) hid; for (Frame f = frame; f; f = f->up) if (array(SCOPE_TYPE) h = hidden[f]) hid = h; if (hid) hid[0] = vars; else scopes["_"] = vars; } else { Frame outermost; for (Frame f = frame; f; f = f->up) if (f->scope_name == scope_name) outermost = f; if (outermost) hidden[outermost][1] = vars; else scopes[scope_name] = vars; } else scopes[scope_name] = vars; } int extend_scope (string scope_name, SCOPE_TYPE vars) //! Adds or extends the specified scope at the global level. //! Returns 1 on success and 0 on failure. { if (scopes[scope_name]) { SCOPE_TYPE oldvars; if (scope_name == "_") { array(SCOPE_TYPE) hid; for (Frame f = frame; f; f = f->up) if (array(SCOPE_TYPE) h = hidden[f]) hid = h; if (hid) oldvars = hid[0]; else oldvars = scopes["_"]; } else { Frame outermost; for (Frame f = frame; f; f = f->up) if (f->scope_name == scope_name) outermost = f; if (outermost) oldvars = hidden[outermost][1]; else oldvars = scopes[scope_name]; } #ifdef DEBUG if (!oldvars) fatal_error ("I before e except after c.\n"); #endif if (!mappingp(vars)) { return 0; } foreach (indices(vars), string var) set_var(var, vars[var], scope_name); } else scopes[scope_name] = vars; return 1; } void remove_scope (string scope_name) //! Removes the named scope from the global level, if it exists. { #ifdef MODULE_DEBUG if (scope_name == "_") fatal_error ("Cannot remove current scope.\n"); #endif Frame outermost; for (Frame f = frame; f; f = f->up) if (f->scope_name == scope_name) outermost = f; if (outermost) m_delete (hidden, outermost); else m_delete (scopes, scope_name); } string current_scope() //! Returns the name of the current scope, if it has any. { if (SCOPE_TYPE vars = scopes["_"]) { string scope_name = search (scopes, vars); do if (scope_name != "_") return scope_name; while ((scope_name = search (scopes, vars, scope_name))); } return 0; } void add_runtime_tag (Tag tag) //! Adds a tag that will exist from this point forward in the //! current context only. { #ifdef MODULE_DEBUG if (tag->plugin_name) fatal_error ("Can't currently handle adding of plugin tags at runtime.\n"); #endif if (!new_runtime_tags) new_runtime_tags = NewRuntimeTags(); new_runtime_tags->add_tag (tag); } void remove_runtime_tag (string|Tag tag, void|int proc_instr) //! If @[tag] is an @[RXML.Tag] object, it's removed from the set of //! runtime tags. If @[tag] is a string, the tag with that name is //! removed. In the latter case, if @[proc_instr] is nonzero the set //! of runtime PI tags is searched, else the set of normal element //! runtime tags. { if (!new_runtime_tags) new_runtime_tags = NewRuntimeTags(); if (objectp (tag)) tag = tag->name; new_runtime_tags->remove_tag (tag); } multiset(Tag) get_runtime_tags() //! Returns all currently active runtime tags. { mapping(string:Tag) tags = runtime_tags; if (new_runtime_tags) tags = new_runtime_tags->filter_tags (tags); return mkmultiset (values (tags)); } void handle_exception (mixed err, PCode|Parser evaluator) //! This function gets any exception that is catched during //! evaluation. evaluator is the object that catched the error. { error_count++; if (objectp (err) && err->is_RXML_Backtrace) { evaluator->error_count++; if (evaluator->report_error && evaluator->recover_errors && evaluator->type->free_text) { string msg; if (id && id->conf) { msg = err->type == "help" ? err->msg : (err->type == "run" ? ([function(Backtrace,Type:string)] tag_set->handle_run_error) : ([function(Backtrace,Type:string)] tag_set->handle_parse_error) ) ([object(Backtrace)] err, evaluator->type); if(!msg) msg = describe_error(err); } else msg = err->msg; if (evaluator->report_error (msg)) return; } throw (err); } else throw_fatal (err); } //(!) Internals: string current_var; // Used to get the parsed variable into the RXML error backtrace. Parser new_parser (Type top_level_type) // Returns a new parser object to start parsing with this context. // Normally TagSet.`() should be used instead of this. { #ifdef MODULE_DEBUG if (in_use || frame) fatal_error ("Context already in use.\n"); #endif return top_level_type->get_parser (this_object()); } mapping(string:SCOPE_TYPE) scopes = ([]); // The variable mappings for every currently visible scope. A // special entry "_" points to the current local scope. mapping(Frame:array(SCOPE_TYPE)) hidden = ([]); // The currently hidden scopes. The indices are frame objects which // introduce scopes. The values are tuples of the current scope and // the named scope they hide. void enter_scope (Frame frame) { #ifdef DEBUG if (!frame->vars) fatal_error ("Frame has no variables.\n"); #endif if (string scope_name = [string] frame->scope_name) { if (!hidden[frame]) hidden[frame] = ({scopes["_"], scopes[scope_name]}); scopes["_"] = scopes[scope_name] = [SCOPE_TYPE] frame->vars; } else { if (!hidden[frame]) hidden[frame] = ({scopes["_"], 0}); scopes["_"] = [SCOPE_TYPE] frame->vars; } } void leave_scope (Frame frame) { if (array(SCOPE_TYPE) back = hidden[frame]) { if (SCOPE_TYPE cur = back[0]) scopes["_"] = cur; else m_delete (scopes, "_"); if (SCOPE_TYPE named = back[1]) { #ifdef MODULE_DEBUG if (!stringp (frame->scope_name)) fatal_error ("Scope named changed to %O during parsing.\n", frame->scope_name); #endif scopes[[string] frame->scope_name] = named; } else m_delete (scopes, [string] frame->scope_name); m_delete (hidden, frame); } } #define ENTER_SCOPE(ctx, frame) \ (frame->vars && frame->vars != ctx->scopes["_"] && ctx->enter_scope (frame)) #define LEAVE_SCOPE(ctx, frame) \ (frame->vars && ctx->leave_scope (frame)) mapping(string:Tag) runtime_tags = ([]); // The active runtime tags. PI tags are stored in the same mapping // with their names prefixed by '?'. NewRuntimeTags new_runtime_tags; // Used to record the result of any add_runtime_tag() and // remove_runtime_tag() calls since the last time the parsers ran. void create (TagSet _tag_set, void|RequestID _id) // Normally TagSet.`() should be used instead of this. { tag_set = _tag_set; id = _id; #ifdef RXML_OBJ_DEBUG __object_marker->create (this_object()); #endif } UNWIND_STATE unwind_state; // If this is a mapping, we have an unwound stack state. It contains // strings with arbitrary exception info, and the objects being // unwound with arrays containing the extra state info they need. // The first entry in these arrays are always the subobject. The // special entries are: // // "top": ({Frame|Parser|PCode (top object)}) // "stream_piece": mixed (When continuing, do a streaming // do_process() with this stream piece.) // "exec_left": array (Exec array left to evaluate. Only used // between Frame._exec_array() and Frame._eval().) MARK_OBJECT_ONLY; string _sprintf() {return "RXML.Context" + OBJ_COUNT;} #ifdef MODULE_DEBUG #if constant (thread_create) Thread.Thread in_use; #else int in_use; #endif #endif } static class NewRuntimeTags // Tool class used to track runtime tags in Context. { static mapping(string:Tag) add_tags; static mapping(string:int|string) remove_tags; void add_tag (Tag tag) { if (!add_tags) add_tags = ([]); if (tag->flags & FLAG_PROC_INSTR) { add_tags["?" + tag->name] = tag; // By doing the following, we can let remove_proc_instrs take precedence. if (remove_tags) m_delete (remove_tags, "?" + tag->name); } else { add_tags[tag->name] = tag; if (remove_tags) m_delete (remove_tags, tag->name); } } void remove_tag (string name, int proc_instr) { if (!remove_tags) remove_tags = ([]); if (proc_instr) remove_tags["?" + name] = name; else remove_tags[name] = 1; } array(Tag) added_tags() { if (!add_tags) return ({}); if (remove_tags) return values (add_tags - remove_tags); return values (add_tags); } array(string) removed_tags() { return remove_tags ? indices (filter (remove_tags, intp)) : ({}); } array(string) removed_pi_tags() { return remove_tags ? values (remove_tags) - ({1}) : ({}); } mapping(string:Tag) filter_tags (mapping(string:Tag) tags) { if (add_tags) tags |= add_tags; if (remove_tags) tags -= remove_tags; return tags; } } class Backtrace //! The object used to throw RXML errors. { constant is_generic_error = 1; constant is_RXML_Backtrace = 1; string type; // Currently "run" or "parse". string msg; Context context; Frame frame; string current_var; array backtrace; void create (void|string _type, void|string _msg, void|Context _context, void|array _backtrace) { type = _type; msg = _msg; if (context = _context || get_context()) { frame = context->frame; current_var = context->current_var; } if (_backtrace) backtrace = _backtrace; else { backtrace = predef::backtrace(); backtrace = backtrace[..sizeof (backtrace) - 2]; } } string describe_rxml_backtrace (void|int no_msg) //! Returns a formatted RXML frame backtrace. { String.Buffer txt = String.Buffer(); txt->add (no_msg ? "" : "RXML" + (type ? " " + type : "") + " error"); if (context) { if (!no_msg) txt->add (": " + (msg || "(no error message)\n")); if (current_var) txt->add (" | &" + current_var + ";\n"); for (Frame f = frame; f; f = f->up) { string name; if (f->tag) name = f->tag->name; else if (!f->up) break; else name = "(unknown)"; if (f->flags & FLAG_PROC_INSTR) txt->add (" | <?" + name + "?>\n"); else { txt->add (" | <" + name); if (mappingp (f->args)) foreach (sort (indices (f->args)), string arg) { mixed val = f->args[arg]; txt->add (" " + arg + "="); if (arrayp (val)) txt->add (map (val, error_print_val) * ","); else txt->add (error_print_val (val)); } else txt->add (" (no argmap)"); txt->add (">\n"); } } } else if (!no_msg) txt->add (" (no context): " + (msg || "(no error message)\n")); return txt->get(); } private string error_print_val (mixed val) { if (arrayp (val)) return "array"; else if (mappingp (val)) return "mapping"; else if (multisetp (val)) return "multiset"; else return sprintf ("%O", val); } string|array `[] (int i) { switch (i) { case 0: return describe_rxml_backtrace(); case 1: return backtrace; } } string _sprintf() {return "RXML.Backtrace(" + (type || "") + ")";} } //(!) Current context: //(!) It's set before any function in RXML.Tag or RXML.Frame is called. #if constant (thread_create) private Thread.Local _context = Thread.Local(); local void set_context (Context ctx) {_context->set (ctx);} local Context get_context() {return [object(Context)] _context->get();} #else private Context _context; local void set_context (Context ctx) {_context = ctx;} local Context get_context() {return _context;} #endif #if defined (MODULE_DEBUG) && constant (thread_create) // Got races in this debug check, but looks like we have to live with that. :\ #define ENTER_CONTEXT(ctx) \ Context __old_ctx = get_context(); \ set_context (ctx); \ if (ctx) { \ if (ctx->in_use && ctx->in_use != this_thread()) \ fatal_error ("Attempt to use context asynchronously.\n"); \ ctx->in_use = this_thread(); \ } \ PROFILE_ENTER (ctx, "rxml internal"); #define LEAVE_CONTEXT() \ PROFILE_LEAVE (get_context(), "rxml internal"); \ if (Context ctx = get_context()) \ if (__old_ctx != ctx) ctx->in_use = 0; \ set_context (__old_ctx); #else #define ENTER_CONTEXT(ctx) \ Context __old_ctx = get_context(); \ set_context (ctx); \ PROFILE_ENTER (ctx, "rxml internal"); #define LEAVE_CONTEXT() \ PROFILE_LEAVE (get_context(), "rxml internal"); \ set_context (__old_ctx); #endif //(!) Constants for the bit field RXML.Frame.flags. constant FLAG_NONE = 0x00000000; //! The no-flags flag. In case you think 0 is too ugly. ;) constant FLAG_DEBUG = 0x40000000; //! Write a lot of debug during the execution of the tag, showing what //! type conversions are done, what callbacks are being called etc. //! Note that @tt{DEBUG@} must be defined for the debug printouts to //! be compiled in (normally enabled with the @tt{--debug@} flag to //! Roxen). //(!) Static flags (i.e. tested in the Tag object): constant FLAG_PROC_INSTR = 0x00000010; //! Flags this as a processing instruction tag (i.e. one parsed with //! the @tt{<?name ... ?>@} syntax in XML). The string after the tag //! name to the ending separator constitutes the content of the tag. //! Arguments are not used. constant FLAG_COMPAT_PARSE = 0x00000002; //! Makes the @[RXML.PXml] parser parse the tag in an HTML compatible //! way: If @[FLAG_EMPTY_ELEMENT] is set and the tag doesn't end with //! @tt{"/>"@}, it will be parsed as an empty element. The effect of //! this flag in other parsers is currently undefined. constant FLAG_NO_PREFIX = 0x00000004; //! Never apply any prefix to this tag. constant FLAG_SOCKET_TAG = 0x00000008; //! Declare the tag to be a socket tag, which accepts plugin tags (see //! @[RXML.Tag.plugin_name] for details). constant FLAG_DONT_PREPARSE = 0x00000040; //! Don't preparse the content with the @[RXML.PXml] parser. This is //! always the case for PI tags, so this flag doesn't have any effect //! for those. This is only used in the simple tag wrapper. Defined //! here as placeholder. constant FLAG_POSTPARSE = 0x00000080; //! Postparse the result with the @[RXML.PXml] parser. This is only //! used in the simple tag wrapper. Defined here as placeholder. //(!) The rest of the flags are dynamic (i.e. tested in the Frame object): constant FLAG_EMPTY_ELEMENT = 0x00000001; //! If set, the tag does not use any content. E.g. with an HTML parser //! this defines whether the tag is a container or not, and in XML //! parsing the parser will signal an error if the tag have anything //! but "" as content. Should not be changed after //! @[RXML.Frame.do_enter] has returned. constant FLAG_PARENT_SCOPE = 0x00000100; //! If set, exec arrays will be interpreted in the scope of the parent //! tag, rather than in the current one. constant FLAG_NO_IMPLICIT_ARGS = 0x00000200; //! If set, the parser won't apply any implicit arguments. FIXME: Not //! yet implemented. constant FLAG_STREAM_RESULT = 0x00000400; //! If set, the @[do_process] function will be called repeatedly until //! it returns 0 or no more content is wanted. constant FLAG_STREAM_CONTENT = 0x00000800; //! If set, the tag supports getting its content in streaming mode: //! @[do_process] will be called repeatedly with successive parts of //! the content then. Can't be changed from @[do_process]. //! //! @note //! It might be obvious, but using streaming is significantly less //! effective than nonstreaming, so it should only be done when big //! delays are expected. constant FLAG_STREAM = FLAG_STREAM_RESULT | FLAG_STREAM_CONTENT; constant FLAG_UNPARSED = 0x00001000; //! If set, @[RXML.Frame.args] and @[RXML.Frame.content] contain //! unparsed strings. The frame will be parsed before it's evaluated. //! This flag should never be set in @[RXML.Tag.flags], but it's //! useful when creating frames directly (see @[make_unparsed_tag]). constant FLAG_DONT_RECOVER = 0x00002000; //! If set, RXML errors are never recovered when parsing the content //! in the tag. If any occurs, it will instead abort the execution of //! this tag too to propagate the error to the parent tag. //! //! When an error occurs, the parser aborts tags upward in the frame //! stack until it comes to one which looks like it can accept an //! error report in its content. The parser then reports the error //! there and continues. //! //! The criteria for the frame which will handle the error recovery is //! that its content type has the @[RXML.Type.free_text] property, and //! that the parser that parses it has an @[RXML.Parser.report_error] //! function (which e.g. @[RXML.PXml] has). With this flag, a frame //! can declare that it isn't suitable to receive error reports even //! if it satisfies this. constant FLAG_DONT_REPORT_ERRORS = FLAG_DONT_RECOVER; // For compatibility. constant FLAG_RAW_ARGS = 0x00004000; //! Special flag to @[RXML.t_xml.format_tag]; only defined here as a //! placeholder. When this is given to @[RXML.t_xml.format_tag], it //! only encodes the argument quote character with the "Roxen //! encoding" when writing argument values, instead of encoding with //! entity references. It's intended for reformatting a tag which has //! been parsed by @[Parser.HTML] (or @[parse_html]) but hasn't been //! processed further. //(!) The following flags specifies whether certain conditions must be //(!) met for a cached frame to be considered (if RXML.Frame.is_valid() //(!) is defined). They may be read directly after do_return() returns. //(!) The tag name is always the same. FIXME: These are ideas only; //(!) nothing is currently implemented and they might change //(!) arbitrarily. constant FLAG_CACHE_DIFF_ARGS = 0x00010000; //(!) If set, the arguments to the tag need not be the same (using //(!) @[equal]) as the cached args. constant FLAG_CACHE_DIFF_CONTENT = 0x00020000; //(!) If set, the content need not be the same. constant FLAG_CACHE_DIFF_RESULT_TYPE = 0x00040000; //(!) If set, the result type need not be the same. (Typically //(!) not useful unless @[cached_return] is used.) constant FLAG_CACHE_DIFF_VARS = 0x00080000; //(!) If set, the variables with external scope in vars (i.e. normally //(!) those that has been accessed with @[get_var]) need not have the //(!) same values (using @[equal]) as the actual variables. constant FLAG_CACHE_DIFF_TAG_INSTANCE = 0x00100000; //(!) If set, the tag in the source document needs to be the same, so //(!) the same frame may be used when the tag occurs in another context. constant FLAG_CACHE_EXECUTE_RESULT = 0x00200000; //(!) If set, an exec array will be stored in the frame instead of the //(!) final result. On a cache hit it'll be executed to produce the //(!) result. class Frame //! A tag instance. A new frame is normally created for every parsed //! tag in the source document. It might be reused both when the //! document is requested again and when the tag is reevaluated in a //! loop, but it's not certain in either case. Therefore, be careful //! about using variable initializers. { constant is_RXML_Frame = 1; constant thrown_at_unwind = 1; //(!) Interface: Frame up; //! The parent frame. This frame is either created from the content //! inside the up frame, or it's in an exec array produced by the up //! frame. Tag tag; //! The @[RXML.Tag] object this frame was created from. int flags; //! Various bit flags that affect parsing. See the @tt{FLAG_*@} //! constants. It's copied from @[Tag.flag] when the frame is //! created. mapping(string:mixed)|EVAL_ARGS_FUNC args; //! The (parsed and evaluated) arguments passed to the tag. Set //! every time the frame is executed, before any frame callbacks are //! called. Not set for processing instruction (@[FLAG_PROC_INSTR]) //! tags. //! //! This variable is also used to hold a function that generates the //! argument mapping between evaluations of the frame. It never does //! when any of the callbacks except @[cached_return] are called, //! though. Type content_type; //! The type of the content. mixed|PCode content = nil; //! The content, if any. Set before @[do_process] and @[do_return] //! are called. Initialized to @[RXML.nil] every time the frame //! executed. //! //! This variable is also used to hold an unevaluated representation //! of the content between evaluations of the frame. It never does //! when any of the callbacks except @[cached_return] are called, //! though. Type result_type; //! The required result type. If it has a parser, it will affect how //! execution arrays are handled; see the return value for //! @[do_return] for details. //! //! This is set by the type inference from @[Tag.result_types] before //! any frame callbacks are called. The frame may change this type, //! but it must produce a result value which matches it. The value //! is converted before being inserted into the parent content if //! necessary. An exception (which this frame can't catch) is thrown //! if conversion is impossible. mixed result = nil; //! The result, which is assumed to be either @[RXML.nil] or a valid //! value according to result_type. The exec arrays returned by e.g. //! @[do_return] changes this. It may also be set directly. //! Initialized to @[RXML.nil] every time the frame executed. //! //! If @[result_type] has a parser set, it will be used by //! @[do_return] etc before assigning to this variable. Thus it //! contains the value after any parsing and will not be parsed //! again. //! @decl optional mapping(string:mixed) vars; //! //! Set this to introduce a new variable scope that will be active //! during parsing of the content and return values (but see also //! @[FLAG_PARENT_SCOPE]). //! @decl optional string scope_name; //! //! The scope name for the variables. Must be set before the scope //! is used for the first time, and can't be changed after that. //! @decl optional TagSet additional_tags; //! //! If set, the tags in this tag set will be used in addition to the //! tags inherited from the surrounding parser. The additional tags //! will in turn be inherited by subparsers. //! @decl optional TagSet local_tags; //! //! If set, the tags in this tag set will be used in the parser for //! the content, instead of the one inherited from the surrounding //! parser. The tags are not inherited by subparsers. //! @decl optional Frame parent_frame; //! //! If this variable exists, it gets set to the frame object of the //! closest surrounding tag that defined this tag in its //! @[additional_tags] or @[local_tags]. Useful to access the //! "mother tag" from the subtags it defines. //! @decl optional string raw_tag_text; //! //! If this variable exists, it gets the raw text representation of //! the tag, if there is any. Note that it's after parsing of any //! splice argument. //! @decl optional array do_enter (RequestID id); //! @decl optional array do_process (RequestID id, void|mixed piece); //! @decl optional array do_return (RequestID id); //! //! @[do_enter] is called first thing when processing the tag. //! @[do_process] is called after (some of) the content has been //! processed. @[do_return] is called lastly before leaving the tag. //! //! For tags that loops more than one time (see @[do_iterate]): //! @[do_enter] is only called initially before the first call to //! @[do_iterate]. @[do_process] is called after each iteration. //! @[do_return] is called after the last call to @[do_process]. //! //! The @[result_type] variable is set to the type of result the //! parser wants. The tag may change it; the value will then be //! converted to the type that the parser wants. If the result type //! is sequential, it's added to the surrounding content, otherwise //! it is used as value of the content, and there's an error of the //! content has a value already. If the result is @[RXML.nil], it //! does not affect the surrounding content at all. //! //! Return values: //! @list dl //! @item array //! A so-called exec array to be handled by the parser. The //! elements are processed in order, and have the following usage: //! @list dl //! @item string //! Added or put into the result. If the result type has a //! parser, the string will be parsed with it before it's //! assigned to the result variable and passed on. //! @item RXML.Frame //! Already initialized frame to process. Neither arguments nor //! content will be parsed. It's result is added or put into the //! result of this tag. //! @item mapping(string:mixed) //! A response mapping which will be returned instead of the //! evaluated page. The evaluation is stopped immediately after //! this. FIXME: Not yet implemented. //! @item object //! Treated as a file object to read in blocking or nonblocking //! mode. FIXME: Not yet implemented, details not decided. //! @item multiset(mixed) //! Should only contain one element that'll be added or put into //! the result. Normally not necessary; assign it directly to //! the result variable instead. //! @item propagate_tag() //! Use a call to this function to propagate the tag to be //! handled by an overridden tag definition, if any exists. If //! this is used, it's probably necessary to define the //! @[raw_tag_text] variable. For further details see the doc //! for @[propagate_tag] in this class. //! @endlist //! @item 0 //! Do nothing special. Exits the tag when used from //! @[do_process] and @[FLAG_STREAM_RESULT] is set. //! @endlist //! //! Note that the intended use is not to postparse by setting a //! parser on the result type, but instead to return an array with //! literal strings and @[RXML.Frame] objects where parsing (or, //! more accurately, evaluation) needs to be done. //! //! If an array instead of a function is given, the array is handled //! as above. If the result variable is @[RXML.nil] (which it //! defaults to), @[content] is used as @[result] if it's of a //! compatible type. //! //! If there is no @[do_return] and the result from parsing the //! content is not @[RXML.nil], it's assigned to or added to the //! @[result] variable. Assignment is used if the content type is //! nonsequential, addition otherwise. //! //! Regarding @[do_process] only: //! //! Normally the @[content] variable is set to the parsed content of //! the tag before @[do_process] is called. This may be @[RXML.nil] //! if the content parsing didn't produce any result. //! //! @[piece] is used when the tag is operating in streaming mode //! (i.e. @[FLAG_STREAM_CONTENT] is set). It's then set to each //! successive part of the content in the stream, and the @[content] //! variable is never touched. @[do_process] is also called //! "normally" with no @[piece] argument afterwards. Note that tags //! that support streaming mode might still be used nonstreaming (it //! might also vary between iterations). //! //! As long as @[FLAG_STREAM_RESULT] is set, @[do_process] will be //! called repeatedly until it returns 0. It's only the result piece //! from the execution array that is propagated after each turn; the //! result variable only accumulates all these pieces. //! @decl optional int do_iterate (RequestID id); //! //! Controls the number of passes in the tag done by the parser. In //! every pass, the content of the tag (if any) is processed, then //! @[do_process] is called. //! //! Before doing any pass, @[do_iterate] is called. If the return //! value is nonzero, that many passes is done, then @[do_iterate] //! is called again and the process repeats. If the return value is //! zero, the tag exits and the value in @[result] is used in the //! surrounding content as described above. //! //! The most common way to iterate is to do the setup before every //! pass (e.g. setup the variable scope) and return 1 to do one pass //! through the content. This will repeat until 0 is returned. //! //! If @[do_iterate] is a positive integer, that many passes is done //! and then the tag exits. If @[do_iterate] is zero or missing, one //! pass is done. If @[do_iterate] is negative, no pass is done. //! @decl optional int|function(RequestID:int) is_valid; //! //! When defined, the frame may be cached. First the name of the tag //! must be the same. Then the conditions specified by the cache //! bits in flag are checked. Then, if this is a function, it's //! called. If it returns 1, the frame is reused. FIXME: Not yet //! implemented. optional array cached_return (Context ctx, void|mixed piece); //! If defined, this will be called to get the value from a cached //! frame (that's still valid) instead of using the cached result. //! It's otherwise handled like @[do_return]. Note that the cached //! frame may be used from several threads. FIXME: Not yet //! implemented. //(!) Services: final mixed get_var (string var, void|string scope_name, void|Type want_type) //! A wrapper for easy access to @[RXML.Context.get_var]. { return get_context()->get_var (var, scope_name, want_type); } final mixed set_var (string var, mixed val, void|string scope_name) //! A wrapper for easy access to @[RXML.Context.set_var]. { return get_context()->set_var (var, val, scope_name); } final void delete_var (string var, void|string scope_name) //! A wrapper for easy access to @[RXML.Context.delete_var]. { get_context()->delete_var (var, scope_name); } void run_error (string msg, mixed... args) //! A wrapper for easy access to @[RXML.run_error]. { _run_error (msg, @args); } void parse_error (string msg, mixed... args) //! A wrapper for easy access to @[RXML.parse_error]. { _parse_error (msg, @args); } void tag_debug (string msg, mixed... args) //! Writes the message to the debug log if this tag has //! @[FLAG_DEBUG] set. { if (flags & FLAG_DEBUG) report_debug (msg, @args); } void terminate() //! Makes the parser abort. The data parsed so far will be returned. //! Does not return; throws a special exception instead. { fatal_error ("FIXME\n"); } void suspend() //! Used together with @[resume] for nonblocking mode. May be called //! from any frame callback to suspend the parser: The parser will //! just stop, leaving the context intact. If this function returns, //! the parser is used in a place that doesn't support nonblocking, //! so it's then ok to go ahead and block. { fatal_error ("FIXME\n"); } void resume() //! Makes the parser continue where it left off. The function that //! called @[suspend] will be called again. { fatal_error ("FIXME\n"); } mapping(string:Tag) get_plugins() //! Returns the plugins registered for this tag, which is assumed to //! be a socket tag, i.e. to have @[FLAG_SOCKET_TAG] set (see //! @[Tag.plugin_name] for details). Indices are the //! @tt{plugin_name@} values for the plugin @[RXML.Tag] objects, //! values are the plugin objects themselves. Don't be destructive //! on the returned mapping. { #ifdef MODULE_DEBUG if (!(tag->flags & FLAG_SOCKET_TAG)) fatal_error ("This tag is not a socket tag.\n"); #endif return get_context()->tag_set->get_plugins (tag->name, tag->flags & FLAG_PROC_INSTR); } final Tag get_overridden_tag() //! Returns the @[RXML.Tag] object the tag for this frame overrides, //! if any. { return get_context()->tag_set->get_overridden_tag (tag); } Frame|string propagate_tag (void|mapping(string:string) args, void|string content) //! This function is intended to be used in the execution array from //! @[do_return] etc to propagate the tag to the next overridden tag //! definition, if any exists. It either returns a frame from the //! overridden tag or, if no overridden tag exists, a string //! containing a formatted tag (which requires that the result type //! supports formatted tags, i.e. has a working @[format_tag] //! function). If @[args] and @[content] are given, they will be //! used in the tag after parsing, otherwise the @[raw_tag_text] //! variable is used, which must have a string value. { Frame this = this_object(); #ifdef MODULE_DEBUG #define CHECK_RAW_TEXT \ if (zero_type (this->raw_tag_text)) \ fatal_error ("The variable raw_tag_text must be defined.\n"); \ if (!stringp (this->raw_tag_text)) \ fatal_error ("raw_tag_text must have a string value.\n"); #else #define CHECK_RAW_TEXT #endif // FIXME: This assumes an xml-like parser. if (object(Tag) overridden = get_overridden_tag()) { Frame frame; if (flags & FLAG_PROC_INSTR) { if (!content) { CHECK_RAW_TEXT; content = t_xml->parse_tag (this->raw_tag_text)[2]; #ifdef DEBUG if (!stringp (content)) fatal_error ("Failed to parse PI tag content for <?%s?> from %O.\n", tag->name, this->raw_tag_text); #endif } } else if (!args || !content && !(flags & FLAG_EMPTY_ELEMENT)) { CHECK_RAW_TEXT; string ignored; [ignored, args, content] = t_xml->parse_tag (this->raw_tag_text); #ifdef DEBUG if (!mappingp (args)) fatal_error ("Failed to parse tag args for <%s> from %O.\n", tag->name, this->raw_tag_text); if (!stringp (content) && !(flags & FLAG_EMPTY_ELEMENT)) fatal_error ("Failed to parse tag content for <%s> from %O.\n", tag->name, this->raw_tag_text); #endif } frame = overridden (args, content || ""); frame->flags |= FLAG_UNPARSED; return frame; } else { CHECK_RAW_TEXT; // Format a new tag, as like the original as possible. if (flags & FLAG_PROC_INSTR) { if (content) { string name; [name, args, content] = t_xml->parse_tag (this->raw_tag_text); return result_type->format_tag (name, 0, content, tag->flags); } else return this->raw_tag_text; } else { string s; if (!args || !content && !(flags & FLAG_EMPTY_ELEMENT)) { #ifdef MODULE_DEBUG if (mixed err = catch { #endif s = t_xml (PXml)->eval (this->raw_tag_text, get_context(), empty_tag_set); #ifdef MODULE_DEBUG }) { if (objectp (err) && ([object] err)->thrown_at_unwind) fatal_error ("Can't save parser state when evaluating arguments.\n"); throw_fatal (err); } #endif if (!args && !content) return s; } else s = this->raw_tag_text; [string name, mapping(string:string) parsed_args, string parsed_content] = t_xml->parse_tag (this->raw_tag_text); #ifdef DEBUG if (!mappingp (parsed_args)) fatal_error ("Failed to parse tag args for <%s> from %O.\n", tag->name, this->raw_tag_text); if (!stringp (parsed_content)) fatal_error ("Failed to parse tag content for <%s> from %O.\n", tag->name, this->raw_tag_text); #endif if (!args) args = parsed_args; if (!content && !(flags & FLAG_EMPTY_ELEMENT)) content = parsed_content; return result_type->format_tag (name, args, content, tag->flags); } #undef CHECK_RAW_TEXT } } //(!) Internals: #ifdef DEBUG # define THIS_TAG_TOP_DEBUG(msg, args...) \ (TAG_DEBUG_TEST (flags) && report_debug ("%O: " + (msg), this_object(), args), 0) # define THIS_TAG_DEBUG(msg, args...) \ (TAG_DEBUG_TEST (flags) && report_debug ("%O: " + (msg), this_object(), args), 0) # define THIS_TAG_DEBUG_ENTER_SCOPE(ctx, this) \ if (this->vars && ctx->scopes["_"] != this->vars) \ THIS_TAG_DEBUG ("(Re)entering scope %O\n", this->scope_name) # define THIS_TAG_DEBUG_LEAVE_SCOPE(ctx, this) \ if (this->vars && ctx->scopes["_"] == this->vars) \ THIS_TAG_DEBUG ("Leaving scope %O\n", this->scope_name) #else # define THIS_TAG_TOP_DEBUG(msg, args...) 0 # define THIS_TAG_DEBUG(msg, args...) 0 # define THIS_TAG_DEBUG_ENTER_SCOPE(ctx, this) 0 # define THIS_TAG_DEBUG_LEAVE_SCOPE(ctx, this) 0 #endif #define SET_SEQUENTIAL(from, to, desc) \ do { \ THIS_TAG_DEBUG ("Adding %s to " desc "\n", \ utils->format_short (from)); \ to += from; \ } while (0) #define SET_NONSEQUENTIAL(from, to, to_type, desc) \ do { \ if (from != nil) { \ if (to != nil) \ parse_error ( \ "Cannot append another value %s to non-sequential " desc \ " of type %s.\n", utils->format_short (from), \ to_type->name); \ THIS_TAG_DEBUG ("Setting " desc " to %s\n", \ utils->format_short (from)); \ to = from; \ } \ } while (0) #define CONV_RESULT(from, from_type, to, to_type) \ do { \ if (from_type->name != to_type->name) { \ THIS_TAG_DEBUG ("Converting result from %s to %s of " \ "surrounding content\n", \ from_type->name, to_type->name); \ to = to_type->encode (from, from_type); \ } \ else to = from; \ } while (0) private void _exec_array_fatal (string where, int pos, mixed elem, string msg, mixed... args) { if (sizeof (args)) msg = sprintf (msg, args); fatal_error ("Position %d in exec array from %s is %s: %s", pos, where, elem, msg); }; mixed _exec_array (Context ctx, TagSetParser|PCode evaler, array exec, string where) { Frame this = this_object(); int i = 0, parent_scope = flags & FLAG_PARENT_SCOPE; mixed res = nil; Parser subparser = 0; mixed err = catch { if (parent_scope) { THIS_TAG_DEBUG_LEAVE_SCOPE (ctx, this); LEAVE_SCOPE (ctx, this); } for (; i < sizeof (exec); i++) { mixed elem = exec[i], piece = nil; switch (sprintf ("%t", elem)) { case "string": if (result_type->parser_prog == PNone) { THIS_TAG_DEBUG ("Exec[%d]: String %s\n", i, utils->format_short (elem)); piece = elem; } else { subparser = result_type->get_parser (ctx, 0, evaler); if (evaler->recover_errors && !(flags & FLAG_DONT_RECOVER)) subparser->recover_errors = 1; THIS_TAG_DEBUG ("Exec[%d]: Parsing string %s with %O\n", i, utils->format_short (elem), subparser); subparser->finish ([string] elem); // Might unwind. piece = subparser->eval(); // Might unwind. subparser = 0; } break; case "mapping": THIS_TAG_DEBUG ("Exec[%d]: Response mapping\n", i); _exec_array_fatal (where, i, elem, "Response mappings not yet implemented.\n"); break; case "multiset": if (sizeof ([multiset] elem) == 1) { piece = ((array) elem)[0]; THIS_TAG_DEBUG ("Exec[%d]: Verbatim value %s\n", i, utils->format_short (piece)); } else _exec_array_fatal (where, i, elem, "Not exactly one value in multiset.\n"); break; default: if (objectp (elem)) // Can't count on that sprintf ("%t", ...) on an object // returns "object". if (([object] elem)->is_RXML_Frame) { THIS_TAG_DEBUG ("Exec[%d]: Evaluating frame %O\n", i, ([object] elem)); piece = ([object(Frame)] elem)->_eval ( ctx, evaler, result_type); // Might unwind. break; } else if (([object] elem)->is_RXML_Parser) { // The subparser above unwound. THIS_TAG_DEBUG ("Exec[%d]: Continuing eval of frame %O\n", i, ([object] elem)); ([object(Parser)] elem)->finish(); // Might unwind. piece = ([object(Parser)] elem)->eval(); // Might unwind. break; } _exec_array_fatal (where, i, elem, "Not a valid type.\n"); } if (result_type->sequential) SET_SEQUENTIAL (piece, res, "result"); else SET_NONSEQUENTIAL (piece, result, result_type, "result"); } if (result_type->sequential) result += res; else res = result; if (parent_scope) { THIS_TAG_DEBUG_ENTER_SCOPE (ctx, this); ENTER_SCOPE (ctx, this); } return res; }; if (result_type->sequential) result += res; if (parent_scope) { THIS_TAG_DEBUG_ENTER_SCOPE (ctx, this); ENTER_SCOPE (ctx, this); } if (objectp (err) && ([object] err)->thrown_at_unwind) { THIS_TAG_DEBUG ("Exec: Interrupted at position %d\n", i); UNWIND_STATE ustate; if ((ustate = ctx->unwind_state) && !zero_type (ustate->stream_piece)) { // Subframe wants to stream. Update stream_piece and send it on. if (result_type->name != evaler->type->name) res = evaler->type->encode (res, result_type); if (result_type->sequential) SET_SEQUENTIAL (ustate->stream_piece, res, "stream piece"); else SET_NONSEQUENTIAL (ustate->stream_piece, res, result_type, "stream piece"); ustate->stream_piece = res; } ustate->exec_left = exec[i..]; // Left to execute. if (subparser) // Replace the string with the subparser object so that we'll // continue in it later. It's done here to keep the original // exec array untouched. ([array] ustate->exec_left)[0] = subparser; throw (err); } throw_fatal (err); } private void _handle_runtime_tags (Context ctx, TagSetParser parser) { // FIXME: PCode handling. array(Tag) arr_add_tags = ctx->new_runtime_tags->added_tags(); array(string) arr_rem_tags = ctx->new_runtime_tags->removed_tags(); array(string) arr_rem_pi_tags = ctx->new_runtime_tags->removed_pi_tags(); for (Parser p = parser; p; p = p->_parent) if (p->tag_set_eval && !p->_local_tag_set && p->add_runtime_tag) { foreach (arr_add_tags, Tag tag) { THIS_TAG_DEBUG ("Adding runtime tag %O\n", tag); ([object(TagSetParser)] p)->add_runtime_tag (tag); } foreach (arr_rem_tags, string tag) { THIS_TAG_DEBUG ("Removing runtime tag %s\n", tag); ([object(TagSetParser)] p)->remove_runtime_tag (tag); } foreach (arr_rem_pi_tags, string tag) { THIS_TAG_DEBUG ("Removing runtime tag %s\n", tag); ([object(TagSetParser)] p)->remove_runtime_tag (tag, 1); } } ctx->runtime_tags = ctx->new_runtime_tags->filter_tags (ctx->runtime_tags); ctx->new_runtime_tags = 0; } #define LOW_CALL_CALLBACK(res, cb, args...) \ do { \ THIS_TAG_DEBUG ("Calling " #cb "\n"); \ PROFILE_SWITCH (ctx, "rxml internal", "tag:" + tag->name); \ COND_PROF_ENTER(tag,tag->name,"tag"); \ res = (cb) (args); /* Might unwind. */ \ COND_PROF_LEAVE(tag,tag->name,"tag"); \ PROFILE_SWITCH (ctx, "tag:" + tag->name, "rxml internal"); \ } while (0) #define EXEC_CALLBACK(ctx, evaler, exec, cb, args...) \ do { \ if (!exec) \ if (arrayp (cb)) { \ THIS_TAG_DEBUG ("Getting exec array from " #cb "\n"); \ exec = [array] cb; \ } \ else { \ LOW_CALL_CALLBACK (exec, cb, args); \ THIS_TAG_DEBUG ((exec ? "Exec array of length " + \ sizeof (exec) : "Zero") + \ " returned from " #cb "\n"); \ THIS_TAG_DEBUG_ENTER_SCOPE (ctx, this); \ ENTER_SCOPE (ctx, this); \ if (evaler->is_RXML_Parser && ctx->new_runtime_tags) \ /* FIXME: When the evaler is a PCode object we should have a \ * debug check here that ensures that the same runtime tag \ * changes are done as in the first eval. */ \ _handle_runtime_tags (ctx, evaler); \ } \ } while (0) #define EXEC_ARRAY(ctx, evaler, exec, cb) \ do { \ if (exec) { \ mixed res = \ _exec_array (ctx, evaler, exec, #cb); /* Might unwind. */ \ if (flags & FLAG_STREAM_RESULT) { \ DO_IF_DEBUG ( \ if (ctx->unwind_state) \ fatal_error ("Clobbering unwind_state to do streaming.\n"); \ if (piece != nil) \ fatal_error ("Thanks, we think about how nice it must be " \ "to play the harmonica...\n"); \ ); \ CONV_RESULT (res, result_type, res, type); \ ctx->unwind_state = (["stream_piece": res]); \ THIS_TAG_DEBUG ("Streaming %s from " #cb "\n", \ utils->format_short (res)); \ throw (this); \ } \ exec = 0; \ } \ } while (0) private mapping(string:mixed) _eval_args (Context ctx, mapping(string:string) raw_args, mapping(string:Type) my_req_args) // Used for evaluating the dynamic arguments in the splice argument. // Destructive on raw_args. { // Note: Approximate code duplication in _prepare and Tag.eval_args(). mapping(string:Type) atypes = raw_args & (tag->req_arg_types | tag->opt_arg_types); if (my_req_args) { mapping(string:Type) missing = my_req_args - atypes; if (sizeof (missing)) parse_error ("Required " + (sizeof (missing) > 1 ? "arguments " + String.implode_nicely ( sort (indices (missing))) + " are" : "argument " + indices (missing)[0] + " is") + " missing.\n"); } #ifdef MODULE_DEBUG if (mixed err = catch { #endif foreach (indices (raw_args), string arg) { Type t = atypes[arg] || tag->def_arg_type; if (t->parser_prog != PNone) { Parser parser = t->get_parser (ctx, 0, 0); THIS_TAG_DEBUG ("Evaluating argument value %s with %O\n", utils->format_short (raw_args[arg]), parser); parser->finish (raw_args[arg]); // Should not unwind. raw_args[arg] = parser->eval(); // Should not unwind. THIS_TAG_DEBUG ("Setting dynamic argument %s to %s\n", utils->format_short (arg), utils->format_short (raw_args[arg])); t->give_back (parser); } } #ifdef MODULE_DEBUG }) { if (objectp (err) && ([object] err)->thrown_at_unwind) fatal_error ("Can't save parser state when evaluating dynamic arguments.\n"); throw_fatal (err); } #endif return raw_args; } EVAL_ARGS_FUNC _prepare (Context ctx, Type type, mapping(string:string) raw_args) // Evaluates raw_args simultaneously as generating the // EVAL_ARGS_FUNC function. The result of the evaluations is stored // in args. Might be destructive on raw_args. { Frame this = this_object(); mixed err = catch { #ifdef DEBUG if (!up) #endif up = ctx->frame; ctx->frame = this; // Push the frame to get proper backtraces. if (++ctx->frame_depth >= ctx->max_frame_depth) { ctx->frame_depth--; _run_error ("Too deep recursion -- exceeding %d nested tags.\n", ctx->max_frame_depth); } EVAL_ARGS_FUNC func; if (raw_args) { #ifdef MODULE_DEBUG if (flags & FLAG_PROC_INSTR) fatal_error ("Can't pass arguments to a processing instruction tag.\n"); #endif #ifdef MAGIC_HELP_ARG if (raw_args->help) { func = utils->return_help_arg; args = raw_args; } else #endif if (sizeof (raw_args)) { // Note: Approximate code duplication in _eval_args and Tag.eval_args(). string splice_arg = raw_args["::"]; if (splice_arg) m_delete (raw_args, "::"); else splice_arg = 0; mapping(string:Type) splice_req_types; mapping(string:Type) atypes = raw_args & tag->req_arg_types; if (sizeof (atypes) < sizeof (tag->req_arg_types)) if (splice_arg) splice_req_types = tag->req_arg_types - atypes; else { array(string) missing = sort (indices (tag->req_arg_types - atypes)); parse_error ("Required " + (sizeof (missing) > 1 ? "arguments " + String.implode_nicely (missing) + " are" : "argument " + missing[0] + " is") + " missing.\n"); } atypes += raw_args & tag->opt_arg_types; PikeCompile comp = PikeCompile(); String.Buffer fn_text = String.Buffer(); if (splice_arg) { // Note: This assumes an XML-like parser. Parser p = splice_arg_type->get_pcode_parser (ctx, 0, 0); THIS_TAG_DEBUG ("Evaluating splice argument %s\n", utils->format_short (splice_arg)); #ifdef MODULE_DEBUG if (mixed err = catch { #endif p->finish (splice_arg); // Should not unwind. splice_arg = p->eval(); // Should not unwind. #ifdef MODULE_DEBUG }) { if (objectp (err) && ([object] err)->thrown_at_unwind) fatal_error ("Can't save parser state when " "evaluating splice argument.\n"); throw_fatal (err); } #endif fn_text->add ( sprintf ("return %s (context, " "RXML.xml_tag_parser->parse_tag_args ((%s) || \"\"), %s) + ([\n", comp->bind (_eval_args), p->p_code->_compile_text (comp), comp->bind (splice_req_types))); p->p_code = 0; splice_arg_type->give_back (p); args = _eval_args (ctx, xml_tag_parser->parse_tag_args (splice_arg || ""), splice_req_types); } else { args = raw_args; fn_text->add ("return ([\n"); } #ifdef MODULE_DEBUG if (mixed err = catch { #endif foreach (indices (raw_args), string arg) { Type t = atypes[arg] || tag->def_arg_type; if (t->parser_prog != PNone) { Parser parser = t->get_pcode_parser (ctx, 0, 0); THIS_TAG_DEBUG ("Evaluating argument value %s with %O\n", utils->format_short (raw_args[arg]), parser); parser->finish (raw_args[arg]); // Should not unwind. args[arg] = parser->eval(); // Should not unwind. THIS_TAG_DEBUG ("Setting argument %s to %s\n", utils->format_short (arg), utils->format_short (args[arg])); fn_text->add (sprintf ("%O: %s,\n", arg, parser->p_code->_compile_text (comp))); parser->p_code = 0; t->give_back (parser); } else { args[arg] = raw_args[arg]; fn_text->add (sprintf ("%O: %s,\n", arg, comp->bind (raw_args[arg]))); } } #ifdef MODULE_DEBUG }) { if (objectp (err) && ([object] err)->thrown_at_unwind) fatal_error ("Can't save parser state when evaluating arguments.\n"); throw_fatal (err); } #endif fn_text->add ("]);\n"); string fn = comp->decl_func ( "mapping(string:mixed)", "RXML.Context context", fn_text->get()); func = comp->compile()()[fn]; } else { func = utils->return_empty_mapping; args = raw_args; } } else func = utils->return_zero; if (!zero_type (this->parent_frame)) if (up->local_tags && up->local_tags->has_tag (tag)) { THIS_TAG_DEBUG ("Setting parent_frame to %O from local_tags\n", up); this->parent_frame = up; } else { int nest = 1; Frame frame = up; for (; frame; frame = frame->up) if (frame->additional_tags && frame->additional_tags->has_tag (tag)) { if (!--nest) break; } else if (frame->tag == tag) nest++; THIS_TAG_DEBUG ("Setting parent_frame to %O from additional_tags\n", frame); this->parent_frame = frame; break; } if (!result_type) { #ifdef MODULE_DEBUG if (!tag) fatal_error ("result_type not set in Frame object %O, " "and it has no Tag object to use for inferring it.\n", this); #endif find_result_type: { // First check if any of the types is a subtype of the // wanted type. If so, we can use it directly. foreach (tag->result_types, Type rtype) if (rtype->subtype_of (type)) { result_type = rtype; break find_result_type; } // Then check if any of the types is a supertype of the // wanted type. If so, set the result type to the wanted // type, since the tag has the responsibility to produce a // value of that type. foreach (tag->result_types, Type rtype) if (type->subtype_of (rtype)) { result_type = type (rtype->parser_prog, @rtype->parser_args); break find_result_type; } parse_error ( "Tag returns %s but %s is expected.\n", String.implode_nicely ([array(string)] tag->result_types->name, "or"), type->name); } THIS_TAG_DEBUG ("Resolved result_type to %s from surrounding %s\n", result_type->name, type->name); } else THIS_TAG_DEBUG ("Keeping result_type %s\n", result_type->name); if (!content_type) { #ifdef MODULE_DEBUG if (!tag) fatal_error ("content_type not set in Frame object %O, " "and it has no Tag object to use for inferring it.\n", this); #endif content_type = tag->content_type; if (content_type == t_same) { content_type = result_type (content_type->parser_prog, @content_type->parser_args); THIS_TAG_DEBUG ("Resolved t_same to content_type %O\n", content_type); } else THIS_TAG_DEBUG ("Setting content_type to %O from tag\n", content_type); } else THIS_TAG_DEBUG ("Keeping content_type %O\n", content_type); ctx->frame = up; return func; }; ctx->frame = up; throw (err); } mixed _eval (Context ctx, TagSetParser|PCode evaler, Type type, void|string|PCode in_content) // Note: It might be somewhat tricky to override this function, // since it handles unwinding through exceptions. { Frame this = this_object(); RequestID id = ctx->id; // Unwind state data: #define EVSTAT_BEGIN 0 #define EVSTAT_ENTERED 1 #define EVSTAT_LAST_ITER 2 #define EVSTAT_ITER_DONE 3 int eval_state = EVSTAT_BEGIN; EVAL_ARGS_FUNC in_args; //in_content; int iter; #ifdef DEBUG int debug_iter = 1; #endif object(Parser)|object(PCode) subevaler; mixed piece; array exec = 0; TagSet orig_tag_set; // Flags that we added additional_tags to ctx->tag_set. //ctx->new_runtime_tags #define PRE_INIT_ERROR(X...) (ctx->frame = this, fatal_error (X)) #ifdef DEBUG // Internal sanity checks. if (ctx != get_context()) PRE_INIT_ERROR ("Context not current.\n"); if (!evaler->tag_set_eval) PRE_INIT_ERROR ("Calling _eval() with non-tag set parser.\n"); Frame prev_ctx_frame = ctx->frame; #endif #ifdef MODULE_DEBUG if (ctx->new_runtime_tags) PRE_INIT_ERROR ("Looks like Context.add_runtime_tag() or " "Context.remove_runtime_tag() was used outside any parser.\n"); #endif #undef PRE_INIT_ERROR mixed conv_result = nil; // Result converted to the expected type. mixed err1 = 0; process_tag: do { if ((err1 = catch { // Catch errors but don't allow unwinds. if (array state = ctx->unwind_state && ctx->unwind_state[this]) { #ifdef DEBUG if (in_content) fatal_error ("Can't feed new content when resuming parse.\n"); #endif ctx->frame = this; object ignored; [ignored, eval_state, in_args, in_content, iter, subevaler, piece, exec, orig_tag_set, ctx->new_runtime_tags #ifdef DEBUG , debug_iter #endif ] = state; m_delete (ctx->unwind_state, this); if (!sizeof (ctx->unwind_state)) ctx->unwind_state = 0; THIS_TAG_TOP_DEBUG ("Continuing evaluation" + (piece ? " with stream piece\n" : "\n")); } else { // Initialize a new evaluation. if (tag) { TRACE_ENTER("tag <" + tag->name + ">", tag); #ifdef MODULE_LEVEL_SECURITY if (id->conf->check_security (tag, id, id->misc->seclevel)) { THIS_TAG_TOP_DEBUG ("Access denied - exiting\n"); TRACE_LEAVE("access denied"); break process_tag; } #endif } if (in_content) { THIS_TAG_TOP_DEBUG ("Evaluating\n"); ctx->frame = this; if (functionp (args)) { THIS_TAG_DEBUG ("Evaluating compiled arguments\n"); in_args = args; args = in_args (ctx); } content = nil; } else if (flags & FLAG_UNPARSED) { #ifdef DEBUG if (args && !mappingp (args)) fatal_error ("args is not a mapping in unparsed frame.\n"); if (!stringp (content)) fatal_error ("content is not a string in unparsed frame.\n"); #endif THIS_TAG_TOP_DEBUG ("Evaluating unparsed\n"); in_args = _prepare (ctx, type, args); ctx->frame = this; in_content = content; content = nil; flags &= ~FLAG_UNPARSED; } else { _prepare (ctx, type, 0); ctx->frame = this; THIS_TAG_TOP_DEBUG ("Evaluating with constant arguments and content.\n"); } piece = result = nil; } #ifdef DEBUG if (up != prev_ctx_frame) fatal_error ("Frame probably mixed between different simultaneous contexts " "(up: %O, previous ctx->frame: %O).\n", up, prev_ctx_frame); #endif })) { #ifdef MODULE_DEBUG if (objectp (err1) && ([object] err1)->thrown_at_unwind) err1 = catch ( fatal_error ("Can't save parser state when evaluating arguments.\n")); #endif break process_tag; } if (mixed err2 = catch { // Catch errors and allow for unwinds. #ifdef MAGIC_HELP_ARG if (tag && (args || ([]))->help) { TRACE_ENTER ("tag <" + tag->name + " help>", tag); string help = id->conf->find_tag_doc (tag->name, id); TRACE_LEAVE (""); THIS_TAG_TOP_DEBUG ("Reporting help - frame done\n"); ctx->handle_exception ( // Will throw if necessary. Backtrace ("help", help, ctx), evaler); break process_tag; } #endif switch (eval_state) { case EVSTAT_BEGIN: if (array|function(RequestID:array) do_enter = [array|function(RequestID:array)] this->do_enter) { EXEC_CALLBACK (ctx, evaler, exec, do_enter, id); EXEC_ARRAY (ctx, evaler, exec, do_enter); } else { THIS_TAG_DEBUG_ENTER_SCOPE (ctx, this); ENTER_SCOPE (ctx, this); } eval_state = EVSTAT_ENTERED; /* Fall through. */ case EVSTAT_ENTERED: case EVSTAT_LAST_ITER: int|function(RequestID:int) do_iterate = [int|function(RequestID:int)] this->do_iterate; array|function(RequestID:array) do_process = [array|function(RequestID:array)] this->do_process; do { if (eval_state != EVSTAT_LAST_ITER) { if (intp (do_iterate)) { iter = [int] do_iterate || 1; eval_state = EVSTAT_LAST_ITER; #ifdef DEBUG if (iter > 1) THIS_TAG_DEBUG ("Getting %d iterations from do_iterate\n", iter); else if (iter < 0) THIS_TAG_DEBUG ("Skipping to finish since do_iterate is negative\n"); #endif } else { LOW_CALL_CALLBACK (iter, do_iterate, id); THIS_TAG_DEBUG ("%O returned from do_iterate\n", iter); THIS_TAG_DEBUG_ENTER_SCOPE (ctx, this); ENTER_SCOPE (ctx, this); if (evaler->is_RXML_Parser && ctx->new_runtime_tags) _handle_runtime_tags (ctx, evaler); if (!iter) eval_state = EVSTAT_LAST_ITER; } } for (; iter > 0; iter-- DO_IF_DEBUG (, debug_iter++)) { if (in_content) { // Got nested parsing to do. int finished = 1; if (subevaler) finished = 0; // Continuing an unwound subevaler. else if (stringp (in_content)) { if (in_content == "") subevaler = PCode (content_type); else if (flags & FLAG_EMPTY_ELEMENT) parse_error ("This tag doesn't handle content.\n"); else { // The nested content is not yet parsed. if (this->local_tags) { subevaler = content_type->get_pcode_parser ( ctx, [object(TagSet)] this->local_tags, evaler); subevaler->_local_tag_set = 1; THIS_TAG_DEBUG ("Iter[%d]: Parsing and evaluating content %s " "with %O from local_tags\n", debug_iter, utils->format_short (in_content), subevaler); } else { #ifdef DEBUG if (orig_tag_set) fatal_error ("Didn't expect orig_tag_set here.\n"); #endif if (TagSet add_tags = [object(TagSet)] this->additional_tags) { TagSet tset = ctx->tag_set; if (!tset->has_effective_tags (add_tags)) { THIS_TAG_DEBUG ("Installing additional_tags %O\n", add_tags); int hash = HASH_INT2 (tset->id_number, add_tags->id_number); orig_tag_set = tset; TagSet local_ts; if (!(local_ts = local_tag_set_cache[hash])) { local_ts = TagSet ( add_tags->name + "+" + orig_tag_set->name); local_ts->imported = ({add_tags, orig_tag_set}); // Race, but it doesn't matter. local_tag_set_cache[hash] = local_ts; } ctx->tag_set = local_ts; } else THIS_TAG_DEBUG ("Not installing additional_tags %O " "since they're already in the tag set\n", add_tags); } subevaler = content_type->get_pcode_parser (ctx, 0, evaler); #ifdef DEBUG if (content_type->parser_prog != PNone) THIS_TAG_DEBUG ("Iter[%d]: Parsing and evaluating content %s " "with %O\n", debug_iter, utils->format_short (in_content), subevaler); #endif } if (evaler->recover_errors && !(flags & FLAG_DONT_RECOVER)) subevaler->recover_errors = 1; subevaler->finish (in_content); // Might unwind. (in_content = subevaler->p_code)->finish(); finished = 1; } } else { THIS_TAG_DEBUG ("Iter[%d]: Evaluating compiled content\n", debug_iter); subevaler = in_content; // Evaling with p-code. } eval_sub: do { if (piece != nil && flags & FLAG_STREAM_CONTENT) { // Handle a stream piece. THIS_TAG_DEBUG ("Iter[%d]: Got %s stream piece %s\n", debug_iter, finished ? "ending" : "a", utils->format_short (piece)); if (!arrayp (do_process)) { EXEC_CALLBACK (ctx, evaler, exec, do_process, id, piece); if (exec) { mixed res = _exec_array ( ctx, evaler, exec, "do_process"); // Might unwind. if (flags & FLAG_STREAM_RESULT) { #ifdef DEBUG if (!zero_type (ctx->unwind_state->stream_piece)) fatal_error ("Clobbering unwind_state->stream_piece.\n"); #endif CONV_RESULT (res, result_type, res, type); ctx->unwind_state->stream_piece = res; THIS_TAG_DEBUG ("Iter[%d]: Streaming %s from do_process\n", debug_iter, utils->format_short (res)); throw (this); } exec = 0; } else if (flags & FLAG_STREAM_RESULT) { THIS_TAG_DEBUG ("Iter[%d]: do_process finished the stream; " "ignoring remaining content\n", debug_iter); ctx->unwind_state = 0; piece = nil; break eval_sub; } } piece = nil; if (finished) break eval_sub; } else { // No streaming. piece = nil; if (finished) { mixed res = subevaler->_eval (ctx); // Might unwind. if (content_type->sequential) SET_SEQUENTIAL (res, content, "content"); else if (res != nil) SET_NONSEQUENTIAL (res, content, content_type, "content"); break eval_sub; } } if (subevaler->is_RXML_Parser) { subevaler->finish(); // Might unwind. (in_content = subevaler->p_code)->finish(); } finished = 1; } while (1); // Only loops when an unwound subevaler has been recovered. subevaler = 0; } if (do_process) { EXEC_CALLBACK (ctx, evaler, exec, do_process, id); EXEC_ARRAY (ctx, evaler, exec, do_process); } } } while (eval_state != EVSTAT_LAST_ITER); eval_state = EVSTAT_ITER_DONE; /* Fall through. */ case EVSTAT_ITER_DONE: if (array|function(RequestID:array) do_return = [array|function(RequestID:array)] this->do_return) { EXEC_CALLBACK (ctx, evaler, exec, do_return, id); if (exec) { // We don't use EXEC_ARRAY here since it's no idea to // come back even if any streaming should be done. _exec_array (ctx, evaler, exec, "do_return"); // Might unwind. exec = 0; } } else if (result == nil && !(flags & FLAG_EMPTY_ELEMENT)) { if (result_type->parser_prog == PNone) { if (content_type->name != result_type->name) { THIS_TAG_DEBUG ("Assigning content to result after " "conversion from %s to %s\n", content_type->name, result_type->name); result = result_type->encode (content, content_type); } else { THIS_TAG_DEBUG ("Assigning content to result\n"); result = content; } } else if (stringp (content)) { if (!exec) { THIS_TAG_DEBUG ("Parsing content with exec array " "for assignment to result\n"); exec = ({content}); } _exec_array (ctx, evaler, exec, "content parse"); // Might unwind. exec = 0; } } if (result != nil) CONV_RESULT (result, result_type, conv_result, type); #ifdef DEBUG else THIS_TAG_DEBUG ("Skipping nil result\n"); #endif THIS_TAG_DEBUG_LEAVE_SCOPE (ctx, this); LEAVE_SCOPE (ctx, this); if (evaler->is_RXML_Parser && ctx->new_runtime_tags) _handle_runtime_tags (ctx, evaler); } }) { THIS_TAG_DEBUG_LEAVE_SCOPE (ctx, this); LEAVE_SCOPE (ctx, this); string action; exception: { unwind: if (objectp (err2) && ([object] err2)->thrown_at_unwind) { UNWIND_STATE ustate = ctx->unwind_state; if (!ustate) ustate = ctx->unwind_state = ([]); #ifdef DEBUG if (ustate[this]) fatal_error ("Frame already has an unwind state.\n"); #endif if (ustate->exec_left) { exec = [array] ustate->exec_left; m_delete (ustate, "exec_left"); } if (err2 == this || exec && sizeof (exec) && err2 == exec[0]) // This frame or a frame in the exec array wants to stream. if (evaler->read && evaler->unwind_safe) { // Rethrow to continue in parent since we've already done // the appropriate do_process stuff in this frame in // either case. mixed piece = evaler->read(); if (err2 = catch { if (type->sequential) SET_SEQUENTIAL (ustate->stream_piece, piece, "stream piece"); else SET_NONSEQUENTIAL (ustate->stream_piece, piece, type, "stream piece"); }) break unwind; if (err2 == this) err2 = 0; if (orig_tag_set) ctx->tag_set = orig_tag_set, orig_tag_set = 0; action = "break"; THIS_TAG_TOP_DEBUG ("Breaking to parent frame to do streaming\n"); } else { // Can't stream since the parser doesn't allow that. // Just continue. m_delete (ustate, "stream_piece"); action = "continue"; THIS_TAG_TOP_DEBUG ("Not streaming since the parser " "doesn't allow that\n"); } else if (!zero_type (ustate->stream_piece)) { // Got a stream piece from a subframe. We handle it above; // store the state and tail recurse. piece = ustate->stream_piece; m_delete (ustate, "stream_piece"); action = "continue"; } else { action = "break"; // Some other reason - back up to the top. THIS_TAG_TOP_DEBUG ("Interrupted\n"); } ustate[this] = ({err2, eval_state, in_args, in_content, iter, subevaler, piece, exec, orig_tag_set, ctx->new_runtime_tags, #ifdef DEBUG debug_iter, #endif }); TRACE_LEAVE (action); break exception; } THIS_TAG_TOP_DEBUG ("Exception\n"); TRACE_LEAVE ("exception"); ctx->handle_exception (err2, evaler); // Will rethrow unknown errors. result = nil; action = "return"; } switch (action) { case "break": // Throw and handle in parent frame. #ifdef MODULE_DEBUG if (!evaler->unwind_state) fatal_error ("Trying to unwind inside an evaluator " "that isn't unwind safe.\n"); #endif throw (this); case "continue": // Continue in this frame with the stored state. continue process_tag; case "return": // A normal return. break process_tag; default: fatal_error ("Don't you come here and %O on me!\n", action); } } else { THIS_TAG_TOP_DEBUG ("Done\n"); TRACE_LEAVE (""); } break process_tag; } while (1); // Looping only when continuing in streaming mode. // Normal clean up on tag return or exception. if (orig_tag_set) ctx->tag_set = orig_tag_set; ctx->frame = up; ctx->frame_depth--; if (err1) throw (err1); args = in_args, content = in_content; return conv_result; } MARK_OBJECT; string _sprintf() { return "RXML.Frame(" + (tag && [string] tag->name) + ")" + OBJ_COUNT; } } //(!) Global services. //! Shortcuts to some common functions in the current context (see the //! corresponding functions in the @[Context] class for details). final mixed get_var (string var, void|string scope_name, void|Type want_type) {return get_context()->get_var (var, scope_name, want_type);} final mixed user_get_var (string var, void|string scope_name, void|Type want_type) {return get_context()->user_get_var (var, scope_name, want_type);} final mixed set_var (string var, mixed val, void|string scope_name) {return get_context()->set_var (var, val, scope_name);} final mixed user_set_var (string var, mixed val, void|string scope_name) {return get_context()->user_set_var (var, val, scope_name);} final void delete_var (string var, void|string scope_name) {get_context()->delete_var (var, scope_name);} final void user_delete_var (string var, void|string scope_name) {get_context()->user_delete_var (var, scope_name);} final void run_error (string msg, mixed... args) //! Throws an RXML run error with a dump of the parser stack in the //! current context. This is intended to be used by tags for errors //! that can occur during normal operation, such as when the //! connection to an SQL server fails. { if (sizeof (args)) msg = sprintf (msg, @args); array bt = backtrace(); throw (Backtrace ("run", msg, get_context(), bt[..sizeof (bt) - 2])); } final void parse_error (string msg, mixed... args) //! Throws an RXML parse error with a dump of the parser stack in the //! current context. This is intended to be used for programming //! errors in the RXML code, such as lookups in nonexisting scopes and //! invalid arguments to a tag. { if (sizeof (args)) msg = sprintf (msg, @args); array bt = backtrace(); throw (Backtrace ("parse", msg, get_context(), bt[..sizeof (bt) - 2])); } final void fatal_error (string msg, mixed... args) //! Throws a Pike error that isn't catched and handled anywhere. It's //! just like the common @[error] function, but includes the RXML //! frame backtrace. { if (sizeof (args)) msg = sprintf (msg, @args); array bt = backtrace(); throw_fatal (({msg, bt[..sizeof (bt) - 2]})); } final void throw_fatal (mixed err) //! Mainly used internally to throw an error that includes the RXML //! frame backtrace. { if (arrayp (err) && sizeof (err) == 2 || objectp (err) && !err->is_RXML_Backtrace && err->is_generic_error) { string msg; if (catch (msg = err[0])) throw (err); if (stringp (msg) && !has_value (msg, "\nRXML frame backtrace:\n")) { string descr = Backtrace (0, 0)->describe_rxml_backtrace (1); if (sizeof (descr)) { if (sizeof (msg) && msg[-1] != '\n') msg += "\n"; msg += "RXML frame backtrace:\n" + descr; catch (err[0] = msg); } } } throw (err); } final mixed rxml_index (mixed val, string|int|array(string|int) index, string scope_name, Context ctx, void|Type want_type) //! Index the value according to RXML type rules and returns the //! result. Throws RXML exceptions on any errors. If index is an //! array, its elements are used to successively subindex the value, //! e.g. @tt{({"a", 2, "b"})@} corresponds to @tt{val["a"][2]["c"]@}. //! @[scope_name] is used to identify the context for the indexing. //! //! The special RXML index rules are: //! //! @list ul //! @item //! Arrays are indexed with 1 for the first element, or //! alternatively -1 for the last. Indexing an array of size n with //! 0, n+1 or greater, -n-1 or less, or with a non-integer is an //! error. //! @item //! Strings, along with integers and floats, are treated as simple //! scalar types which aren't really indexable. If a scalar type is //! indexed with 1 or -1, it produces itself instead of generating //! an error. (This is a convenience to avoid many special cases //! when treating both arrays and scalar types.) //! @item //! If a value is an object which has an @tt{rxml_var_eval@} //! identifier, it's treated as an @[RXML.Value] object and the //! @[RXML.Value.rxml_var_eval] function is called to produce its //! value. //! @item //! If a value which is about to be indexed is an object which has a //! @tt{`[]@} function, it's called as an @[RXML.Scope] object (see //! @ref{RXML.Scope.`[]@}). //! @item //! Both the special value nil and the undefined value (a zero with //! zero_type 1) may be used to signify no value at all, and both //! will be returned as the undefined value. //! @endlist //! //! If the @[want_type] argument is set, the result value is converted //! to that type with @[RXML.Type.encode]. If the value can't be //! converted, an RXML error is thrown. //! //! This function is mainly for internal use; you commonly want to use //! @[get_var], @[set_var], @[user_get_var] or @[user_set_var] //! instead. { #ifdef MODULE_DEBUG if (arrayp (index) ? !sizeof (index) : !(stringp (index) || intp (index))) fatal_error ("Invalid index specifier.\n"); #endif int scope_got_type = 0; array(string|int) idxpath; if (arrayp (index)) idxpath = index, index = index[0]; else idxpath = ({0}); for (int i = 1;; i++) { // stringp was not really a good idea. if( arrayp( val ) /*|| stringp( val )*/ ) if (intp (index) && index) if( (index > sizeof( val )) || ((index < 0) && (-index > sizeof( val ) )) ) parse_error( "Index %d out of range for array of size %d in %s.\n", index, sizeof (val), scope_name ); else if( index < 0 ) val = val[index]; else val = val[index-1]; else parse_error( "Cannot index the array in %s with %O.\n", scope_name, index ); else if (val == nil) parse_error ("%s produced no value to index with %O.\n", scope_name, index); else if( objectp( val ) && val->`[] ) { #ifdef MODULE_DEBUG Scope scope = [object(Scope)] val; #endif if (zero_type ( val = ([object(Scope)] val)->`[]( index, ctx, scope_name, i == sizeof (idxpath) && (scope_got_type = 1, want_type)))) val = nil; #ifdef MODULE_DEBUG else if (mixed err = scope_got_type && want_type && val != nil && !(objectp (val) && ([object] val)->rxml_var_eval) && catch (want_type->type_check (val))) if (([object] err)->is_RXML_Backtrace) fatal_error ("%O->`[] didn't return a value of the correct type:\n%s", scope, err->msg); else throw (err); #endif } else if( mappingp( val ) || objectp (val) ) { if (zero_type (val = val[ index ])) val = nil; } else if (multisetp (val)) { if (!val[index]) val = nil; } else if (!(<1, -1>)[index]) parse_error ("%s is %O which cannot be indexed with %O.\n", scope_name, val, index); if (i == sizeof (idxpath)) break; scope_name += "." + index; index = idxpath[i]; #ifdef MODULE_DEBUG mapping(object:int) called = ([]); #endif while (objectp (val) && ([object] val)->rxml_var_eval && !([object] val)->`[]) { #ifdef MODULE_DEBUG // Detect infinite loops. This check is slightly too strong; // it's theoretically possible that a couple of Value objects // return each other a few rounds and then something different, // but we'll live with that. Besides, that situation ought to be // solved internally in them anyway. if (called[val]) fatal_error ("Cyclic rxml_var_eval chain detected in %O.\n" "All called objects:%{ %O%}\n", val, indices (called)); called[val] = 1; #endif if (zero_type (val = ([object(Value)] val)->rxml_var_eval ( ctx, index, scope_name, 0))) { val = nil; break; } } } if (val == nil) return ([])[0]; else if (!objectp (val) || !([object] val)->rxml_var_eval) if (want_type && !scope_got_type) return // FIXME: Some system to find out the source type? zero_type (val = want_type->encode (val)) || val == nil ? ([])[0] : val; else return val; #ifdef MODULE_DEBUG mapping(object:int) called = ([]); #endif do { #ifdef MODULE_DEBUG if (called[val]) fatal_error ("Cyclic rxml_var_eval chain detected in %O.\n" "All called objects:%{ %O%}\n", val, indices (called)); called[val] = 1; Value val_obj = [object(Value)] val; #endif if (zero_type (val = ([object(Value)] val)->rxml_var_eval ( ctx, index, scope_name, want_type)) || val == nil) return ([])[0]; #ifdef MODULE_DEBUG else if (mixed err = want_type && catch (want_type->type_check (val))) if (([object] err)->is_RXML_Backtrace) fatal_error ("%O->rxml_var_eval didn't return a value of the correct type:\n%s", val_obj, err->msg); else throw (err); #endif } while (objectp (val) && ([object] val)->rxml_var_eval); return val; } final void tag_debug (string msg, mixed... args) //! Writes the message to the debug log if the innermost tag being //! executed has FLAG_DEBUG set. { if (Frame f = get_context()->frame) // It's intentional that this assumes a context. if (f->flags & FLAG_DEBUG) report_debug (msg, @args); } final Frame make_tag (string name, mapping(string:mixed) args, void|mixed content, void|Tag overridden_by) //! Returns a frame for the specified tag, or 0 if no such tag exists. //! The tag definition is looked up in the current context and tag //! set. @[args] and @[content] are not parsed or evaluated; they're //! used as-is by the tag. If @[overridden_by] is given, the returned //! frame will come from the tag that @[overridden_by] overrides, if //! there is any (@[name] is not used in that case). { TagSet tag_set = get_context()->tag_set; Tag tag = overridden_by ? tag_set->get_overridden_tag (overridden_by) : tag_set->get_tag (name); return tag && tag (args, content); } final Frame make_unparsed_tag (string name, mapping(string:string) args, void|string content, void|Tag overridden_by) //! Returns a frame for the specified tag, or 0 if no such tag exists. //! The tag definition is looked up in the current context and tag //! set. @[args] and @[content] are given unparsed in this variant; //! they're parsed and evaluated when the frame is about to be //! evaluated. If @[overridden_by] is given, the returned frame will //! come from the tag that @[overridden_by] overrides, if there is any //! (@[name] is not used in that case). { TagSet tag_set = get_context()->tag_set; Tag tag = overridden_by ? tag_set->get_overridden_tag (overridden_by) : tag_set->get_tag (name); if (!tag) return 0; Frame frame = tag (args, content); frame->flags |= FLAG_UNPARSED; return frame; } //! @decl Frame parse_frame (Type type, string to_parse); //! //! Returns a frame that, when evaluated, parses the given string //! according to the type (which typically has a parser set). class parse_frame { inherit Frame; constant flags = FLAG_UNPARSED; mapping(string:mixed) args = ([]); void create (Type type, string to_parse) { content_type = type, result_type = type (PNone); content = to_parse; } string _sprintf() {return sprintf ("RXML.parse_frame(%O)", content_type);} } //(!) Parsers: class Parser //! Interface class for a syntax parser that scans, parses and //! evaluates an input stream. Access to a parser object is assumed to //! be done in a thread safe way except where noted. { constant is_RXML_Parser = 1; constant thrown_at_unwind = 1; //(!) Services: int error_count; //! Number of RXML errors that occurred during evaluation. If this //! is nonzero, the value from eval() shouldn't be trusted. function(Parser:void) data_callback; //! A function to be called when data is likely to be available from //! eval(). It's always called when the source stream closes. //! write() and write_end() are the functions to use from outside //! the parser system, not feed() or finish(). int write (string in) //! Writes some source data to the parser. Returns nonzero if there //! might be data available in eval(). { int res; ENTER_CONTEXT (context); if (mixed err = catch { if (context && context->unwind_state && context->unwind_state->top) { #ifdef MODULE_DEBUG if (context->unwind_state->top != this_object()) fatal_error ("The context got an unwound state from another parser. " "Can't rewind.\n"); #endif m_delete (context->unwind_state, "top"); if (!sizeof (context->unwind_state)) context->unwind_state = 0; } if (feed (in)) res = 1; // Might unwind. if (res && data_callback) data_callback (this_object()); }) if (objectp (err) && ([object] err)->thrown_at_unwind) { #ifdef DEBUG if (err != this_object()) { LEAVE_CONTEXT(); fatal_error ("Unexpected unwind object catched.\n"); } #endif if (!context->unwind_state) context->unwind_state = ([]); context->unwind_state->top = err; } else { LEAVE_CONTEXT(); throw_fatal (err); } LEAVE_CONTEXT(); return res; } void write_end (void|string in) //! Closes the source data stream, optionally with a last bit of //! data. { int res; ENTER_CONTEXT (context); if (mixed err = catch { if (context && context->unwind_state && context->unwind_state->top) { #ifdef MODULE_DEBUG if (context->unwind_state->top != this_object()) fatal_error ("The context got an unwound state from another parser. " "Can't rewind.\n"); #endif m_delete (context->unwind_state, "top"); if (!sizeof (context->unwind_state)) context->unwind_state = 0; } finish (in); // Might unwind. if (data_callback) data_callback (this_object()); }) if (objectp (err) && ([object] err)->thrown_at_unwind) { #ifdef DEBUG if (err != this_object()) { LEAVE_CONTEXT(); fatal_error ("Unexpected unwind object catched.\n"); } #endif if (!context->unwind_state) context->unwind_state = ([]); context->unwind_state->top = err; } else { LEAVE_CONTEXT(); throw_fatal (err); } LEAVE_CONTEXT(); #ifdef PROFILE_PARSER werror ("Profile for %s: %O\n", context->id->not_query, context->profile); #endif } mixed handle_var (TagSetParser|PCode evaler, string varref, Type want_type) // Parses and evaluates a possible variable reference, with the // appropriate error handling. { if (mixed err = catch { // It's intentional that we split on the first ':' for now, to // allow for future enhancements of this syntax. Scope and // variable names containing ':' are thus not accessible this way. sscanf (varref, "%[^:]:%s", varref, string encoding); context->current_var = varref; array(string|int) splitted = context->parse_user_var (varref, 1); if (splitted[0] == 1) parse_error ( "No scope in variable reference.\n" "(Use ':' in front to quote a character reference containing dots.)\n"); #ifdef DEBUG if (context->frame) TAG_DEBUG (context->frame, " Looking up variable %s in context of type %s\n", splitted * ".", (encoding ? t_string : want_type)->name); #endif mixed val; PROFILE_SWITCH (context, "rxml internal", "var:" + varref); COND_PROF_ENTER(mixed id=context->id,varref,"entity"); if (zero_type (val = context->get_var ( // May throw. splitted[1..], splitted[0], encoding ? t_string : want_type))) val = nil; COND_PROF_LEAVE(mixed id=context->id,varref,"entity"); PROFILE_SWITCH (context, "var:" + varref, "rxml internal"); if (encoding) { if (!(val = Roxen->roxen_encode (val + "", encoding))) parse_error ("Unknown encoding %O.\n", encoding); #ifdef DEBUG if (context->frame) TAG_DEBUG (context->frame, " Got value %s after conversion " "with encoding %s\n", utils->format_short (val), encoding); #endif } #ifdef DEBUG else if (context->frame) TAG_DEBUG (context->frame, " Got value %s\n", utils->format_short (val)); #endif context->current_var = 0; if (evaler->p_code) evaler->p_code->add (VarRef (splitted[0], splitted[1..], encoding)); return val; }) { context->current_var = 0; context->handle_exception (err, this_object()); // May throw. return nil; } } //(!) Interface: Context context; //! The context to do evaluation in. It's assumed to never be //! modified asynchronously during the time the parser is working on //! an input stream. Type type; //! The expected result type of the current stream. (The parser //! should not do any type checking on this.) PCode p_code; //! Must be set to a new @[PCode] object before a stream is fed //! which should be compiled to p-code. The object will receive the //! compiled code during evaluation and can be used to repeat the //! evaluation after the stream is finished. //! @decl int unwind_safe; //! //! If nonzero, the parser supports unwinding with throw()/catch(). //! Whenever an exception is thrown from some evaluation function, //! it should be able to call that function again with identical //! arguments the next time it continues. int recover_errors; //! Set to nonzero to allow error recovery in this parser. //! report_error() will never be called if this is zero. mixed feed (string in); //! Feeds some source data to the parse stream. The parser may do //! scanning, parsing and evaluation before returning. Returns //! nonzero if there could be new data to get from eval(). void finish (void|string in); //! Like feed(), but also finishes the parse stream. A last bit of //! data may be given. It should work to call this on an already //! finished stream if no argument is given to it. optional int report_error (string msg); //! Used to report errors to the end user through the output. This //! is only called when type->free_text is nonzero and //! recover_errors is nonzero. msg should be stored in the output //! queue to be returned by eval(). If the context is bad for an //! error message, do nothing and return zero. The parser will then //! be aborted and the error will be propagated instead. Return //! nonzero if a message was written. optional mixed read(); //! Define to allow streaming operation. Returns the evaluated //! result so far, but does not do any more evaluation. Returns //! RXML.nil if there's no data. mixed eval(); //! Evaluates the data fed so far and returns the result. The result //! returned by previous eval() calls should not be returned again //! as (part of) this return value. Returns RXML.nil if there's no //! data (for sequential types the empty value is also ok). optional void reset (Context ctx, Type type, mixed... args); //! Define to support reuse of a parser object. It'll be called //! instead of making a new object for a new stream. It keeps the //! static configuration, i.e. the type (and tag set when used in //! @[TagSetParser]). Note that this function needs to deal with //! leftovers from @[TagSetParser.add_runtime_tag] for //! @[TagSetParser] objects. It should call @[initialize] with the //! given context and type to reset this base class properly. optional Parser clone (Context ctx, Type type, mixed... args); //! Define to create new parser objects by cloning instead of //! creating from scratch. It returns a new instance of this parser //! with the same static configuration, i.e. the type (and tag set //! when used in TagSetParser). static void create (Context ctx, Type type, mixed... args) //! Should (at least) call @[initialize] with the given context and //! type. { initialize (ctx, type); #ifdef RXML_OBJ_DEBUG __object_marker->create (this_object()); #endif } static void initialize (Context ctx, Type _type) //! Does the required initialization for this base class. Use from //! @[create] and @[reset] (when it's defined) to initialize or //! reset the parser object properly. { context = ctx; type = _type; } string current_input() {return 0;} //! Should return the representation in the input stream for the //! current tag, entity or text being parsed, or 0 if it isn't //! known. //(!) Internals: mixed _eval (Context ignored) {return eval();} // To be call compatible with PCode. Parser _next_free; // Used to link together unused parser objects for reuse. Parser _parent; // The parent parser if this one is nested. This is only used to // register runtime tags. Stdio.File _source_file; mapping _defines; // These two are compatibility kludges for use with parse_rxml(). MARK_OBJECT_ONLY;

Roxen.git/ server/ etc/ modules/ RXML.pmod/ module.pmod > 9d2646cb3fda1b5a74faf24ec23c07de1ebf3d85 [Annotate]