Roxen.git/server/etc/modules/RXML.pmod/module.pmod:fae5211fb2addc05ca8fbbe5fdf96f22a6010f0d

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6422 6423 6424 6425 6426 6427 6428 6429 6430 // RXML parser and compiler framework. // // Created 1999-07-30 by Martin Stjernholm. // // $Id: module.pmod,v 1.182 2001/06/28 20:24:59 mast Exp $ // Kludge: Must use "RXML.refs" somewhere for the whole module to be // loaded correctly. static object Roxen; class RequestID { }; //! 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: //! //! @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. //! @endul //! //! @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 RXML_COMPILE_DEBUG // #define RXML_ENCODE_DEBUG #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 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)) #undef RXML_CONTEXT #if constant (thread_create) # define RXML_CONTEXT (_cur_rxml_context->get()) # define SET_RXML_CONTEXT(ctx) (_cur_rxml_context->set (ctx)) #else # define RXML_CONTEXT (_cur_rxml_context) # define SET_RXML_CONTEXT(ctx) (_cur_rxml_context = (ctx)) #endif // 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. TagSet tagset; //! The tag set that this tag belongs to, if any. /*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_string, t_any_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. //! //! The types in this list is first searched in order for a type //! that is a subtype of the actual type. If none is found, the list //! is searched through a second time for a type that is a supertype //! of the actual type. //! //! The default value inherited from this class defines the tag to //! produce any string result (and thereby accept any string //! content, due to @[RXML.t_same] in @[content_type]). If the type //! is @tt{text/*@} (@[RXML.t_any_text]) or some subtype, the tag //! operates on text, which means all whitespace is significant. If //! the type is @tt{string@} or some supertype, the tag operates on //! the @tt{string@} type (@[RXML.t_string]) which ignores //! whitespace between tokens (the tag doesn't need to do any //! special treatment of this). //! @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 { \ EVAL_ARGS_FUNC argfunc = 0; \ \ mixed err = 0; \ if (!_frame->args) { \ frame->up = ctx->frame; \ ctx->frame = frame; \ ctx->frame_depth++; \ err = catch { \ argfunc = _frame->_prepare ( \ _ctx, _type, _args, _parser->p_code); \ }; \ ctx->frame = frame->up, frame->up = 0; \ ctx->frame_depth--; \ } \ \ if (!err) err = catch { \ _res = _frame->_eval (_ctx, _parser, _type, 0, _content || ""); \ if (PCode p_code = _parser->p_code) \ p_code->add_frame (_frame, argfunc, _frame->content); \ break eval_frame; \ }; \ \ if (PCode p_code = _parser->p_code) { \ /* Make an unparsed frame in the p-code if the evaluation \ * fails. */ \ _frame->flags |= FLAG_UNPARSED; \ _frame->args = _args, _frame->content = _content || ""; \ p_code->add_frame (_frame, 0, 0); \ } \ \ 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; parser->drain_output(); 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) parser->add_value (result); return ({}); } final array _p_xml_handle_pi_tag (object/*(PXml)*/ parser, string content) { Type type = parser->type; parser->drain_output(); 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) 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; //! Unique identification string. Must be stable across server //! restarts since it's used to identify tag sets in dumped p-code. 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 callbacks in //! imported tag sets will be called in order of precedence; highest //! last. function(Context:void) eval_finish; //! If set, this will be called just before an evaluation of the //! given @[RXML.Context] finishes. The callbacks in imported tag //! sets 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; if (_name) { if (!zero_type (all_tagsets[_name])) { report_warning ("The tag set name %O is not unique - ignoring it.\n", _name); if (TagSet other = all_tagsets[_name]) { // The already registered name is ambigious anyway. other->name = 0; all_tagsets[_name] = 0; } } else all_tagsets[name = _name] = this_object(); } 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; tag->tagset = this_object(); } 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 "name": if (name) m_delete (all_tagsets, name); if (val) all_tagsets[name = val] = this_object(); break; 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);} final Context new_context (void|RequestID id) //! Creates and initializes a new context for use with a parser or //! @[RXML.PCode] object based on this tag set. @[id] is put into //! the context if given. Normally you'd rather use @[get_parser] or //! @[RXML.PCode.new_context] instead of this function. { Context ctx = Context (this_object(), id); call_prepare_funs (ctx); return ctx; } final Parser get_parser (Type top_level_type, void|RequestID id, void|int make_p_code) //! Creates a new context for parsing content of the specified type, //! and returns the parser object for it. @[id] is put into the //! context. The parser will collect an @[RXML.PCode] object if //! @[make_p_code] is nonzero. { return new_context (id)->new_parser (top_level_type, make_p_code); } final Parser `() (Type top_level_type, void|RequestID id, void|int make_p_code) //! For compatibility. Use @[get_parser] instead. { return get_parser (top_level_type, id, make_p_code); } 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); } static void destroy() { catch (changed()); if (name) m_delete (all_tagsets, name); } 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; } final void call_prepare_funs (Context ctx) { if (!prepare_funs) prepare_funs = get_prepare_funs(); (prepare_funs -= ({0})) (ctx); } static array(function(Context:void)) eval_finish_funs; /*static*/ array(function(Context:void)) get_eval_finish_funs() { if (eval_finish_funs) return eval_finish_funs; array(function(Context:void)) funs = ({}); for (int i = sizeof (imported) - 1; i >= 0; i--) funs += imported[i]->get_eval_finish_funs(); if (eval_finish) funs += ({eval_finish}); // We don't cache in eval_finish_funs; do that only at the top level. return funs; } void call_eval_finish_funs (Context ctx) { if (!eval_finish_funs) eval_finish_funs = get_eval_finish_funs(); (eval_finish_funs -= ({0})) (ctx); } 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; } 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; //! Current evaluation recursion depth. This might be more than the //! number of frames in the @[frame] linked chain. int max_frame_depth = 100; //! Maximum allowed evaluation recursion depth. RequestID id; //! mapping(mixed:mixed) misc = ([]); //! Various context info. This is typically the same mapping as //! @tt{id->misc->defines@}. To avoid accidental namespace conflicts //! in this mapping, it's suggested that the module/tag program or //! object is used as index in it. int type_check; //! Whether to do type checking. int error_count; //! Number of RXML errors that has occurred. If this is nonzero, the //! result of the evaluation shouldn't be trusted, but it might be //! wise to return it to the user anyway, as it can contain error //! reports (see @[Parser.recover_errors] and @[FLAG_DONT_RECOVER] //! for further details about error reporting). 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 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; } SCOPE_TYPE get_scope (string scope_name) //! Returns the scope mapping/object for the given scope. { return scopes[scope_name]; } 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)); } int incomplete_eval() //! Returns true if the last evaluation isn't complete, i.e. when //! this context is unwound due to use of streaming/nonblocking //! operation. { return unwind_state && unwind_state->reason == "streaming"; } void handle_exception (mixed err, PCode|Parser evaluator, void|int compile_error) //! 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) { if (evaluator->report_error && evaluator->recover_errors && evaluator->type->free_text) { string msg; if (tag_set && 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)) { if (compile_error && evaluator->p_code) evaluator->p_code->add (CompiledError (err)); return; } } throw (err); } else throw_fatal (err); } final array(mixed|PCode) eval_and_compile (Type type, string to_parse) //! Parses and evaluates @[to_parse] with @[type] in this context. //! At the same time, p-code is collected to reevaluate it later. An //! array is returned which contains the result in the first element //! and the generated @[RXML.PCode] object in the second. { mixed res; PCode p_code; // Frame prev_top_frame = frame; // frame = 0; // mixed err = catch { Parser parser = type->get_parser (this_object(), tag_set, 0, 1); parser->write_end (to_parse); res = parser->eval(); p_code = parser->p_code; parser->p_code = 0; // }; // frame = prev_top_frame; // if (err) throw (err); return ({res, p_code}); } // Internals: final Parser new_parser (Type top_level_type, void|int make_p_code) // 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(), tag_set, 0, make_p_code); } #ifdef DEBUG private int eval_finished = 0; private mixed foo; #endif final void eval_finish() // Called at the end of the evaluation in this context. { if (!frame_depth && tag_set) { #ifdef DEBUG if (eval_finished) fatal_error ("Context already finished.\n" + foo); eval_finished = 1; foo = describe_backtrace (backtrace()); #endif tag_set->call_eval_finish_funs (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 (void|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().) // "reason": string (The reason why the state is unwound. Can // currently be "streaming".) 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; array(Frame) frames; 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 || RXML_CONTEXT) { frames = allocate (context->frame_depth); Frame frame = context->frame; int i = 0; for (; frame; i++, frame = frame->up) frames[i] = frame; frames = frames[..i - 1]; } 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(); function(string...:void) add = txt->add; add (no_msg ? "" : "RXML" + (type ? " " + type : "") + " error"); if (context) { if (!no_msg) add (": ", msg || "(no error message)\n"); if (current_var) add (" | &", current_var, ";\n"); foreach (frames, Frame f) { string name; if (f->tag) name = f->tag->name; //else if (!f->up) break; else name = "(unknown)"; if (f->flags & FLAG_PROC_INSTR) add (" | <?", name, "?>\n"); else { add (" | <", name); if (mappingp (f->args)) foreach (sort (indices (f->args)), string arg) { mixed val = f->args[arg]; add (" ", arg, "="); if (arrayp (val)) add (map (val, error_print_val) * ","); else add (error_print_val (val)); } else add (" (no argmap)"); add (">\n"); } } } else if (!no_msg) 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: final void set_context (Context ctx) {SET_RXML_CONTEXT (ctx);} final Context get_context() {return [object(Context)] RXML_CONTEXT;} //! Returns the current @[RXML.Context] object, which contains all the //! evaluation context info. It's updated before any function in //! @[RXML.Tag] or @[RXML.Frame] is called. //! //! @note //! A slightly faster way to access it is through the @[RXML_CONTEXT] //! macro in @tt{module.h@}. #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 = RXML_CONTEXT; \ SET_RXML_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(); \ } #define LEAVE_CONTEXT() \ if (Context ctx = RXML_CONTEXT) \ if (__old_ctx != ctx) ctx->in_use = 0; \ SET_RXML_CONTEXT (__old_ctx); #else #define ENTER_CONTEXT(ctx) \ Context __old_ctx = RXML_CONTEXT; \ SET_RXML_CONTEXT (ctx); #define LEAVE_CONTEXT() \ SET_RXML_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). // Flags 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. // Flags 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. //! //! @note //! This variable may be set in the @tt{do_*@} callbacks, but it's //! assumed to be static, i.e. its value should not depend on any //! information that's known only at runtime. Practically that means //! that the value is assumed to never change if the frame is reused //! by p-code. mapping(string:mixed)|int(1..1) 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 the value 1 which is used //! internally to signal that this frame is not currently evaluated. //! It's never 1 when any of the callbacks are executed. Type content_type; //! The type of the content. mixed content; //! The content, if any. Set before @[do_process] and @[do_return] //! are called. Initialized to @[RXML.nil] every time the frame //! executed. 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; //! 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. //! //! @note //! This variable may be set in the @[do_enter] callback, but it's //! assumed to be static, i.e. its value should not depend on any //! information that's known only at runtime. Practically that means //! that the value is assumed to never change if the frame is reused //! by p-code. //! @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. //! //! @note //! This variable may be set in the @[do_enter] callback, but it's //! assumed to be static, i.e. its value should not depend on any //! information that's known only at runtime. Practically that means //! that the value is assumed to never change if the frame is reused //! by p-code. //! @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. //! //! @note //! This variable is assumed to be static, i.e. its value doesn't //! depend on any information that's known only at runtime. //! @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: //! @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: //! @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. The functions @[RXML.make_tag], //! @[RXML.make_unparsed_tag] and @[RXML.parse_frame] are useful //! to create frames. //! @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. //! @enddl //! @item 0 //! Do nothing special. Exits the tag when used from //! @[do_process] and @[FLAG_STREAM_RESULT] is set. //! @enddl //! //! 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 the frame, //! instead of the normal @tt{do_*@} functions that evaluates the //! result from scratch. If it returns zero, the normal callbacks //! will be called as usual. this_program clone() //! Called to create a copy of this frame, usually to perform //! evaluation in a thread safe way. Thus this function copies data //! that isn't the result of evaluation, like @[flags], //! @[content_type] and @[result_type] but not @[result] or @[vars]. //! //! A frame corresponds to a specific tag instance in a page, and //! clones of it also corresponds to the same tag instance. Since //! the frame is used to store data during the evaluation (i.e. //! between the @tt{do_*@} callbacks) of the frame it can be //! necessary to clone it to allow the same tag instance to be //! evaluated simultaneously in different threads. //! //! Tags should normally not override the default definition, but it //! can be useful together with @[cached_return] to share caches //! between frame clones. { this_program this = this_object(), clone = object_program (this)(); clone->tag = tag; clone->flags = flags; clone->args = args; clone->content_type = content_type; clone->content = content; clone->result_type = result_type; if (string v = this->scope_name) clone->scope_name = v; if (TagSet v = this->additional_tags) clone->additional_tags = v; if (TagSet v = this->local_tags) clone->local_tags = v; if (string v = this->raw_tag_text) clone->raw_tag_text = v; return clone; } // 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 RXML_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 RXML_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]. { RXML_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 RXML_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 RXML_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, RXML_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)); \ /* Keep only one ref to to to allow destructive change. */ \ to = to + (to = 0, 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 CONVERT_VALUE(from, from_type, to, to_type, desc) \ do { \ if (from_type->name != to_type->name) { \ THIS_TAG_DEBUG (desc, from_type->name, to_type->name); \ to = to_type->encode (from, from_type); \ } \ else to = from; \ } while (0) #define CONV_RESULT(from, from_type, to, to_type) \ CONVERT_VALUE(from, from_type, to, to_type, \ "Converting result from %s to %s of surrounding content\n") 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_PCode) { // THIS_TAG_DEBUG ("Exec[%d]: Evaluating p-code\n", i); // piece = ([object(PCode)] elem)->eval (ctx); // CONVERT_VALUE (piece, ([object(PCode)] elem)->type, // piece, result_type, // "Converting p-code result from %s " // "to tag result type %s\n"); // } 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 = result + (result = 0, 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 = result + (result = 0, 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|PCode evaler) { if (evaler->is_RXML_Parser) { 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 = evaler; 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); } } } // 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. 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"); \ COND_PROF_ENTER(tag,tag->name,"tag"); \ res = (cb) (args); /* Might unwind. */ \ COND_PROF_LEAVE(tag,tag->name,"tag"); \ } 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 (ctx->new_runtime_tags) \ _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, \ "reason": "streaming"]); \ 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|string _prepare (Context ctx, Type type, mapping(string:string) raw_args, PCode p_code) // 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 { if (ctx->frame_depth >= ctx->max_frame_depth) _run_error ("Too deep recursion -- exceeding %d nested tags.\n", ctx->max_frame_depth); EVAL_ARGS_FUNC|string 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; String.Buffer fn_text = p_code && String.Buffer(); if (splice_arg) { // Note: This assumes an XML-like parser. Parser p = splice_arg_type->get_parser (ctx, 0, 0, p_code); 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 if (p_code) fn_text->add ( "return ", p_code->bind (_eval_args), " (context, " "RXML.xml_tag_parser->parse_tag_args ((", p->p_code->_compile_text(), ") || \"\"), ", p_code->bind (splice_req_types), ") + ([\n"); 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; if (p_code) fn_text->add ("return ([\n"); } #ifdef MODULE_DEBUG if (mixed err = catch { #endif if (p_code) 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, p_code); THIS_TAG_DEBUG ("Evaluating and compiling " "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())); t->give_back (parser); } else { args[arg] = raw_args[arg]; fn_text->add (sprintf ("%O: %s,\n", arg, p_code->bind (raw_args[arg]))); } } else 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, 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])); t->give_back (parser); } else args[arg] = 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 if (p_code) { fn_text->add ("]);\n"); func = p_code->add_func ( "mapping(string:mixed)", "RXML.Context context", fn_text->get()); } } 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); return func; }; throw (err); } mixed _eval (Context ctx, TagSetParser|PCode evaler, Type type, void|EVAL_ARGS_FUNC in_args, void|string|PCode in_content) // Note: It might be somewhat tricky to override this function, // since it handles unwinding and rewinding. { 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; //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 != RXML_CONTEXT) PRE_INIT_ERROR ("Context not current.\n"); if (!evaler->tag_set_eval) PRE_INIT_ERROR ("Calling _eval() with non-tag set parser.\n"); if (up) PRE_INIT_ERROR ("up frame already set.\n"); #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 up = ctx->frame; ctx->frame = this; ctx->frame_depth++; 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_args || in_content) fatal_error ("in_args or in_content set when resuming parse.\n"); #endif 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_args) { THIS_TAG_TOP_DEBUG ("Evaluating with compiled arguments\n"); 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, evaler->is_RXML_PCode ? evaler : evaler->p_code); in_content = content; content = nil; flags &= ~FLAG_UNPARSED; } else if (!in_content) { _prepare (ctx, type, 0, 0); THIS_TAG_TOP_DEBUG ("Evaluating with constant arguments and content.\n"); } piece = result = nil; } 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); } })) { #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; int compile = 0; 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 (ctx->new_runtime_tags) _handle_runtime_tags (ctx, evaler); if (iter <= 0) eval_state = EVSTAT_LAST_ITER; } } for (; iter > 0; iter-- DO_IF_DEBUG (, debug_iter++)) { eval_content: 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 == "") { in_content = 0; break eval_content; } else if (flags & FLAG_EMPTY_ELEMENT) parse_error ("This tag doesn't handle content.\n"); else { // The nested content is not yet parsed. object(PCode)|int p_code = (evaler->is_RXML_PCode ? evaler : evaler->p_code) || compile; if (this->local_tags) { subevaler = content_type->get_parser ( ctx, [object(TagSet)] this->local_tags, evaler, p_code); subevaler->_local_tag_set = 1; THIS_TAG_DEBUG ("Iter[%d]: Parsing and %s content %s " "with %O from local_tags\n", debug_iter, p_code ? "compiling" : "evaluating", utils->format_short (in_content), subevaler); } else { subevaler = content_type->get_parser (ctx, 0, evaler, p_code); #ifdef DEBUG if (content_type->parser_prog != PNone) THIS_TAG_DEBUG ("Iter[%d]: Parsing and %s content %s " "with %O\n", debug_iter, p_code ? "compiling" : "evaluating", utils->format_short (in_content), subevaler); #endif } p_code = subevaler->p_code; if (evaler->recover_errors && !(flags & FLAG_DONT_RECOVER)) { subevaler->recover_errors = 1; if (p_code) p_code->recover_errors = 1; } subevaler->finish (in_content); // Might unwind. if (p_code) (in_content = p_code)->finish(); finished = 1; // Always compile if the contents are parsed a second time. compile = 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; ctx->unwind_state->reason = "streaming"; 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 (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"; THIS_TAG_TOP_DEBUG ("Continuing with stream piece.\n"); } 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, up = 0; ctx->frame_depth--; if (err1) throw (err1); args = 1, content = in_content; return conv_result; } MARK_OBJECT; string _sprintf() { return "RXML.Frame(" + (tag && [string] tag->name) + ")" + OBJ_COUNT; } mixed _encode() { return (["_content_type":content_type, "_content":content, "_result_type":result_type, "_args":args, "_raw_tag_text":this_object()->raw_tag_text, "_tag" : !tag->tagset && tag ]); } void _decode(mixed cookie) { content_type = cookie->_content_type; content = cookie->_content; result_type = cookie->_result_type; args = cookie->_args; if (cookie->_tag) tag = cookie->_tag; if(cookie->_raw_tag_text) this_object()->raw_tag_text = cookie->_raw_tag_text; } } // 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 RXML_CONTEXT->get_var (var, scope_name, want_type);} final mixed user_get_var (string var, void|string scope_name, void|Type want_type) {return RXML_CONTEXT->user_get_var (var, scope_name, want_type);} final mixed set_var (string var, mixed val, void|string scope_name) {return RXML_CONTEXT->set_var (var, val, scope_name);} final mixed us

Roxen.git/ server/ etc/ modules/ RXML.pmod/ module.pmod > fae5211fb2addc05ca8fbbe5fdf96f22a6010f0d [Annotate]