Roxen.git/server/etc/modules/RXML.pmod/module.pmod:58a008b308396d05a1549001b273d98f7d2341e7

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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 RXML parser module 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 <module.h> #include <request_trace.h> #define MAGIC_HELP_ARG // #define OBJ_COUNT_DEBUG // #define RXML_OBJ_DEBUG // #define RXML_VERBOSE // #define RXML_REQUEST_VERBOSE // #define RXML_COMPILE_DEBUG // #define RXML_ENCODE_DEBUG // #define TYPE_OBJ_DEBUG // #define PARSER_OBJ_DEBUG // #define FRAME_DEPTH_DEBUG // #define RXML_PCODE_DEBUG // #define RXML_PCODE_UPDATE_DEBUG // #define TAGSET_GENERATION_DEBUG #ifdef RXML_OBJ_DEBUG # define MARK_OBJECT \ mapping|object __object_marker = RoxenDebug.ObjectMarker (this_object()) # define MARK_OBJECT_ONLY \ mapping|object __object_marker = RoxenDebug.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 __object_marker = (["count": ++all_constants()->_obj_count]) # define MARK_OBJECT_ONLY \ mapping|object __object_marker = (["count": ++all_constants()->_obj_count]) # endif # define OBJ_COUNT (__object_marker ? "[" + __object_marker->count + "]" : "") #else # define OBJ_COUNT "" #endif #ifdef DEBUG # define TAG_DEBUG(frame, msg, args...) \ (TAG_DEBUG_TEST (frame && frame->flags & FLAG_DEBUG) && \ report_debug ("%O: " + (msg), (frame), args), 0) #else # define TAG_DEBUG(frame, msg, args...) 0 #endif #ifdef FRAME_DEPTH_DEBUG # define FRAME_DEPTH_MSG(msg...) report_debug (msg) #else # define FRAME_DEPTH_MSG(msg...) #endif #ifdef RXML_PCODE_UPDATE_DEBUG # define PCODE_UPDATE_MSG(msg...) report_debug (msg) #else # define PCODE_UPDATE_MSG(msg...) #endif #define _LITERAL(X) #X #define LITERAL(X) _LITERAL (X) #define HASH_INT2(m, n) (n < 65536 ? (m << 16) + n : sprintf ("%x,%x", m, n)) #undef RXML_CONTEXT #define RXML_CONTEXT (_cur_rxml_context->get()) #define SET_RXML_CONTEXT(ctx) (_cur_rxml_context->set (ctx)) // 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,Parser|PCode:mapping(string:mixed))|string // Internal caches and object tracking // // This must be first so that it happens early in __INIT. static int tag_set_count = 0; static mapping(int|string:TagSet) garb_composite_tag_set_cache() { call_out (garb_composite_tag_set_cache, 30*60); return composite_tag_set_cache = ([]); } static mapping(int|string:TagSet) composite_tag_set_cache = garb_composite_tag_set_cache(); #define GET_COMPOSITE_TAG_SET(a, b, res) do { \ int|string hash = HASH_INT2 (b->id_number, a->id_number); \ if (!(res = composite_tag_set_cache[hash])) { \ res = TagSet (0, 0); \ res->imported = ({a, b}); \ /* Race, but it doesn't matter. */ \ composite_tag_set_cache[hash] = res; \ } \ } while (0) static mapping(RoxenModule|Configuration:mapping(string:TagSet|int)) all_tag_sets = ([]); // Maps all tag sets to their TagSet objects. The top mapping is // indexed with the owner of the tag set, or 0 for global tag sets. // The inner mappings (which always are weak) are indexed by the tag // set names. // // For tag sets that have been removed, the value is their generation // number, so that a new tag set with that name will continue the // generation sequence. We use the fact that a weak mapping won't // remove items that aren't refcounted (and strings). static Thread.Mutex all_tag_sets_mutex = Thread.Mutex(); #define LOOKUP_TAG_SET(owner, name) ((all_tag_sets[owner] || ([]))[name]) // Assumes all_tag_sets_mutex is locked. #define SET_TAG_SET(owner, name, value) do { \ mapping(string:TagSet|int) map = \ all_tag_sets[owner] || \ (all_tag_sets[owner] = set_weak_flag (([]), 1)); \ map[name] = (value); \ } while (0) static mapping(string:program/*(Parser)*/) reg_parsers = ([]); // Maps each parser name to the parser program. static mapping(string:Type) reg_types = ([]); // Maps each type name to a type object with the PNone parser. static mapping(mixed:string) reverse_constants = set_weak_flag (([]), 1); // Interface classes class Tag //! Interface class for the static information about a tag. { constant is_RXML_Tag = 1; constant is_RXML_encodable = 1; constant is_RXML_p_code_frame = 1; constant is_RXML_p_code_entry = 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. //! @decl 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: //! //! @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. //! @endul // Services: 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. { object/*(Frame)HMM*/ frame = ([function(:object/*(Frame)HMM*/)] this_object()->Frame)(); frame->tag = this_object(); frame->flags = this_object()->flags; frame->args = args; frame->content = zero_type (content) ? nil : content; 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: Approximate code duplication in _eval_splice_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, _content) \ 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 = \ ([function(:object/*(Frame)HMM*/)] this_object()->Frame)(); \ _frame->tag = this_object(); \ _frame->flags = this_object()->flags|FLAG_UNPARSED; \ _frame->args = _args; \ _frame->content = _content || ""; \ DO_IF_DEBUG( \ if (_args && ([mapping] (mixed) _args)["_debug_"]) { \ _frame->flags |= FLAG_DEBUG; \ m_delete (_args, "_debug_"); \ } \ ); \ } while (0) #define EVAL_FRAME(_frame, _ctx, _parser, _type, _res) \ do { \ EVAL_ARGS_FUNC argfunc = 0; \ int orig_state_updated = _ctx->state_updated; \ if (mixed err = catch { \ _res = _frame->_eval (_ctx, _parser, _type); \ if (PCode p_code = _parser->p_code) \ p_code->add_frame (_ctx, _frame, _res, 1); \ }) \ 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 { \ if (PCode p_code = _parser->p_code) { \ PCODE_UPDATE_MSG ( \ "%O: Restoring p-code update count from %d to %d " \ "since the frame is stored unevaluated " \ "due to exception.\n", \ _frame, _ctx->state_updated, orig_state_updated); \ _ctx->state_updated = orig_state_updated; \ p_code->add_frame (_ctx, _frame, PCode, 1); \ } \ ctx->handle_exception ( \ err, _parser); /* Will rethrow unknown errors. */ \ _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, content); if (!zero_type (frame->raw_tag_text)) frame->raw_tag_text = parser->raw_tag_text(); mixed result; EVAL_FRAME (frame, ctx, parser, parser->type, 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, content); if (!zero_type (frame->raw_tag_text)) frame->raw_tag_text = parser->current_input(); mixed result; EVAL_FRAME (frame, ctx, parser, type, 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, content); if (!zero_type (frame->raw_tag_text)) frame->raw_tag_text = parser->current_input(); mixed result; EVAL_FRAME (frame, ctx, parser, type, result); if (result != nil) parser->add_value (result); return ({}); } mapping(string:mixed) _eval_splice_args (Context ctx, mapping(string:string) raw_args, mapping(string:Type) my_req_args) // Used from Frame._prepare for evaluating the dynamic arguments in // the splice argument. Destructive on raw_args. { // Note: Approximate code duplication in eval_args and Frame._prepare. mapping(string:Type) atypes = raw_args & (req_arg_types | 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] || def_arg_type; if (t->parser_prog != PNone) { Parser parser = t->get_parser (ctx, ctx->tag_set, 0); TAG_DEBUG (RXML_CONTEXT->frame, "Evaluating argument value %s with %O\n", format_short (raw_args[arg]), parser); parser->finish (raw_args[arg]); // Should not unwind. raw_args[arg] = parser->eval(); // Should not unwind. TAG_DEBUG (RXML_CONTEXT->frame, "Setting dynamic argument %s to %s\n", format_short (arg), format_short (raw_args[arg])); t->give_back (parser, ctx->tag_set); } } #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; } //! @ignore MARK_OBJECT; //! @endignore 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. { constant is_RXML_TagSet = 1; RoxenModule|Configuration owner; //! The owner of this tag set, or zero if the tag set is globally //! shared. The owner is typically the Roxen module that created the //! tag set, but it can also be the @[Configuration] object for some //! special tag sets that don't belong to any module. string name; //! Unique identification string among all with the same @[owner]. //! It may also be zero, in which case the tag set is nameless. //! Nameless tag sets cannot be encoded by @[RXML.p_code_to_string], //! with the exception when they only contain imported tag sets. //! //! If set, the name must be stable across server restarts since //! it's used to identify tag sets in dumped p-code. The name may //! contain the characters "!", "#", "(", ")", ",", "-", ".", "/", //! ":", ";", "<", "=", ">", "?", "@@", "_", and any alphanumeric //! character. //! //! @note //! The module tag set for Roxen parser modules has the name "", so //! you should not use that if you create more tag sets in such a //! module. //! @decl 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. //! @decl 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. //! //! @note //! The return value from @[get_hash] depends on the exact order in //! this array. So even if the order isn't important for tag //! overriding it should not be random in any way, or else //! @[get_hash] won't return stable values. That would in turn make //! decoding with @[RXML.string_to_p_code] fail almost always. 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 (RoxenModule|Configuration owner_, string name_, void|array(Tag) _tags) //! @[owner_] and @[name_] initializes @[owner] and @[name], //! respectively. They are used to identify the tag set and its tags //! when p-code is created and stored on disk. //! //! @[owner_] is the object that "owns" this tag set and is //! typically the @[RoxenModule] object that created it. It can also //! be a @[Configuration] object or zero; see @[owner] for more //! details. //! //! @[name_] identifies the tag set uniquely among those owned by //! @[owner_]. Note that the empty string is already used for the //! main tag set in Roxen tag modules. See @[name] //! //! @example //! A tag set for local or additional tags within an RXML tag in a //! Roxen tag module is typically created like this: //! //! @code{ //! RXML.TagSet internal = //! RXML.TagSet(this_module(), "my-tag", //! ({MySubTag1(), MySubTag2(), ...})); //! @} //! //! "my-tag" is the name of the tag that contains the subtags. It's //! typically a good idea to use the name of that tag, since it //! always is stable enough and unique within the tag set. { id_number = ++tag_set_count; if (name_) { Thread.MutexKey key = all_tag_sets_mutex->lock (2); // Allow recursive locking since we don't touch any other // locks in here. set_name (owner_, name_); key = 0; } else owner = owner_; 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(); } void clear() //! Removes all registered tags, processing instructions and string //! entities. { tags = ([]), proc_instrs = 0; clear_string_entities(); // Calls 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 string get_hash() //! Returns a hash string built from all the tags and imported tag //! sets. It's suitable for use in persistent data to detect whether //! the tag set has changed in any way that would cause different //! tags to be parsed, or if they would be bound to different tag //! definitions. //! //! @note //! In the non-persistent case it's much more efficient to use //! @[generation] to track changes in the tag set. { if (!hash) hash = Crypto.md5()->update (encode_value_canonic (get_hash_data()))->digest(); return hash; } local void add_tag_set_dependency (TagSet tset) //! Makes this tag set depend on @[tset], so that any change in it //! invalidates this tag set and affects the hash returned by //! @[get_hash]. //! //! This kind of dependency normally exists on the imported tag //! sets, but this function lets you add a dependency without //! getting the tags imported. It's typically useful to get proper //! dependencies on tag sets that contain local or runtime tags. { dep_tag_sets[tset] = 1; tset->do_notify (changed); changed(); } local void remove_tag_set_dependency (TagSet tset) //! Removes a dependency added by @[add_tag_set_dependency]. { dep_tag_sets[tset] = 0; tset->dont_notify (changed); } 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 "owner": { Thread.MutexKey key = all_tag_sets_mutex->lock (2); // Allow recursive locking since we don't touch any other // locks in here. if (name) SET_TAG_SET (owner, name, generation); set_name (val, name); break; } case "name": { Thread.MutexKey key = all_tag_sets_mutex->lock (2); // Allow recursive locking since we don't touch any other // locks in here. if (name) SET_TAG_SET (owner, name, generation); set_name (owner, val); 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. { #ifdef TAGSET_GENERATION_DEBUG werror ("%O update, generation %d -> %d\n", this_object(), generation, generation + 1); #endif generation++; prepare_funs = 0; overridden_tag_lookup = 0; plugins = pi_plugins = 0; hash = 0; (notify_funcs -= ({0}))(); set_weak_flag (notify_funcs, 1); got_local_tags = sizeof (tags) || (proc_instrs && sizeof (proc_instrs)); #ifdef TAGSET_GENERATION_DEBUG werror ("%O update done, generation %d -> %d\n", this_object(), generation - 1, generation); #endif } 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); } array(TagSet) tag_set_components() // If this is a composite tag set importing exactly two other tag // sets and nothing else, those two are returned. Used by the codec // to encode tag sets produced by GET_COMPOSITE_TAG_SET. { return !sizeof (tags) && !proc_instrs && !string_entities && sizeof (imported) == 2 && imported; } static void destroy() { catch (changed()); if (name) SET_TAG_SET (owner, name, generation); } static void set_name (Configuration new_owner, string new_name) // Note: Assumes all_tag_sets_mutex is locked already. { if (new_name) { object(TagSet)|int old_tag_set = LOOKUP_TAG_SET (owner, name); if (objectp (old_tag_set)) { // It'd be nice if we could warn about duplicate tag sets with // the same name here, but unfortunately that doesn't work // well enough: Local tag sets from old module instances might // still be around with references from cached frames in stale // p-code. old_tag_set = old_tag_set->generation; } if (generation <= old_tag_set) generation = old_tag_set; owner = new_owner; name = new_name; SET_TAG_SET (owner, name, this_object()); } else { owner = new_owner; name = 0; } } 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 multiset(TagSet) dep_tag_sets = set_weak_flag ((<>), 1); /*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. } static string hash; /*static*/ array get_hash_data() { return ({ this_object()->prefix, this_object()->prefix_req, sort (indices (tags)), proc_instrs && sort (indices (proc_instrs)), string_entities, }) + imported->get_hash_data() + ({0}) + indices (dep_tag_sets)->get_hash_data(); } /*static*/ string tag_set_component_names() { return name || sizeof (imported) && imported->tag_set_component_names() * "+"; } string _sprintf() { return "RXML.TagSet(" + // No, the owner isn't written unambiguously; we try to be brief here. (owner && (owner->is_module ? owner->module_local_id() : owner->name)) + "," + tag_set_component_names() + ")" + OBJ_COUNT; //return "RXML.TagSet(" + id_number + ")" + OBJ_COUNT; } //! @ignore MARK_OBJECT_ONLY; //! @endignore } TagSet empty_tag_set; //! The empty tag set. TagSet shared_tag_set (RoxenModule|Configuration owner, string name, void|array(Tag) tags) //! If a tag set with the given owner and name exists, it's returned. //! Otherwise a new tag set is created with them. @[tags] is passed //! along to its @[RXML.TagSet.create] function in that case. Note //! that @[owner] may be zero to get a tag set that is global. { Thread.MutexKey key = all_tag_sets_mutex->lock(); if (TagSet tag_set = LOOKUP_TAG_SET (owner, name)) if (objectp (tag_set)) return tag_set; return TagSet (owner, name, tags); } 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: //! //! @code{ //! return type && type != RXML.t_text ? //! type->encode (my_string, RXML.t_text) : my_string; //! @} //! //! 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]. optional string format_rxml_backtrace_frame ( Context ctx, string var, string scope_name); //! Define this to control how the variable reference is formatted //! in RXML backtraces. The returned string should be one line, //! without a trailing newline. It should not contain the " | " //! prefix. //! //! The empty string may be returned to suppress the backtrace frame //! altogether. That might be useful for some types of internally //! used variables, but it should be used only if there are very //! good reasons; the backtrace easily just becomes confusing //! instead. 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, void|int from_m_delete) //! 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. @[from_m_delete] is an internal kludge for 2.1 //! compatibility; it should never be given a value. { if (!from_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, 1);} optional string format_rxml_backtrace_frame ( Context ctx, string var, string scope_name); //! Define this to control how the variable reference is formatted //! in RXML backtraces. The returned string should be one line, //! without a trailing newline. It should not contain the " | " //! prefix. //! //! The empty string may be returned to suppress the backtrace frame //! altogether. That might be useful for some types of internally //! used variables, but it should be used only if there are very //! good reasons; the backtrace easily just becomes confusing //! instead. 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. constant max_frame_depth = 100; //! Maximum allowed evaluation recursion depth. RequestID id; //! mapping(mixed:mixed) misc = ([]); //! Various context info, typically internal stuff that shouldn't be //! directly accessible by the user in some scope. 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. //! //! Note however that the indices and values in this mapping //! sometimes might need to be encoded by @[RXML.p_code_to_string], //! so use some object to which it can properly encode references //! (preferably @[RXML.Tag], @[RXML.TagSet], and Roxen module //! objects). int type_check; // Whether to do type checking. FIXME: Not fully implemented. 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 void state_update() //! Should be called whenever the persistent state changes. For tag //! implementors that means whenever the value that //! @[RXML.Frame.save] would return changes. { #ifdef RXML_PCODE_UPDATE_DEBUG array a = backtrace(); PCODE_UPDATE_MSG ("%O: P-code update by request from %s", this_object(), describe_backtrace (a[sizeof (a) - 2..sizeof (a) - 2])); #endif state_updated++; } 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 split 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]; array(string|int) path = var[..sizeof (var) - 1]; vars = rxml_index (vars, path, scope_name, this_object()); scope_name += "." + (array(string)) path * "."; if (mapping var_chg = misc->variable_changes) var_chg[encode_value_canonic (({scope_name}) + var)] = val; } else { index = var[0]; if (mapping var_chg = misc->variable_changes) var_chg[encode_value_canonic (({scope_name, index}))] = val; } else { index = var; if (mapping var_chg = misc->variable_changes) var_chg[encode_value_canonic (({scope_name, index}))] = val; } 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 %s.\n", scope_name, format_short (index) ); else parse_error ("%s is %s which cannot be indexed with %s.\n", scope_name, format_short (vars), format_short (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) { array(string|int) path = var[..sizeof (var) - 1]; vars = rxml_index (vars, path, scope_name, this_object()); scope_name += "." + (array(string)) path * "."; if (mapping var_chg = misc->variable_changes) var_chg[encode_value_canonic (({scope_name}) + var)] = nil; var = var[-1]; } else { var = var[0]; if (mapping var_chg = misc->variable_changes) var_chg[encode_value_canonic (({scope_name, var}))] = nil; } else { if (mapping var_chg = misc->variable_changes) var_chg[encode_value_canonic (({scope_name, var}))] = nil; } 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 %s from the %t in %s.\n", format_short (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 (void|int list_hidden) //! Returns the names of all defined scopes. If @[list_hidden] is //! nonzero then internal scopes are also returned. { if (list_hidden) return indices (scopes) - ({"_"}); else return indices (scopes) - ({"_", "_internal_"}); } int exist_scope (void|string scope_name) //! { return !!scopes[scope_name || "_"]; } #define CLEANUP_VAR_CHG_SCOPE(var_chg, scope_name) do { \ foreach (indices (var_chg), mixed encoded_var) \ if (stringp (encoded_var)) { \ mixed var = decode_value (encoded_var); \ if (arrayp (var) && var[0] == scope_name) \ m_delete (var_chg, encoded_var); \ } \ } while (0) 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; if (mapping var_chg = misc->variable_changes) { CLEANUP_VAR_CHG_SCOPE (var_chg, scope_name); var_chg[encode_value_canonic (({scope_name}))] = mappingp (vars) ? vars + ([]) : vars; } } void extend_scope (string scope_name, SCOPE_TYPE vars) //! Adds or extends the specified scope at the global level. //! //! @note //! The contents of @[vars] is currently transferred over to the //! existing scope object, if there is any. That's usually not an //! issue if the scopes are mappings, but can be if @[vars] is an //! @[RXML.Scope] object, or the existing scope is such an object //! that doesn't handle assignments. { 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 foreach (objectp (vars) ? ([object(Scope)] vars)->_indices (this_object(), scope_name || "_") : indices(vars), string var) set_var(var, vars[var], scope_name); } else { scopes[scope_name] = vars; if (mapping var_chg = misc->variable_changes) { CLEANUP_VAR_CHG_SCOPE (var_chg, scope_name); var_chg[encode_value_canonic (({scope_name}))] = mappingp (vars) ? vars + ([]) : vars; } } } 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); if (mapping var_chg = misc->variable_changes) { CLEANUP_VAR_CHG_SCOPE (var_chg, scope_name); var_chg[encode_value_canonic (({scope_name}))] = 0; } } 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 set_misc (mixed index, mixed value) //! Sets an index:value pair in @[misc]. The given index is removed //! from @[misc] if @[value] is @[RXML.nil]. //! //! This function also records the setting if p-code is being result //! compiled, so that the setting is remade when the cached p-code //! result is reevaluated (see @[RXML.FLAG_DONT_CACHE_RESULT]). It //! should therefore be used whenever a tag that doesn't use //! @[RXML.FLAG_DONT_CACHE_RESULT] sets a value in @[misc] to be //! used by some other tag or variable later in the evaluation. In //! other situations it's perfectly all right to access @[misc] //! directly. //! //! @note //! Neither @[index] nor @[value] is copied when stored in the //! cache. That means that you probably don't want to change them //! destructively, or else those changes can have propagated //! "backwards" when the cached p-code is used. //! //! @note //! For compatibility reasons, changes of the _ok flag //! (@tt{@[misc][" _ok"]@}) are detected and saved automatically. //! Thus it is not necessary to call @[set_misc] to change it. This //! is a special case and does not apply to any other entry in //! @[misc]. { if (value == nil) m_delete (misc, index); else misc[index] = value; if (mapping var_chg = misc->variable_changes) { if (stringp (index)) index = encode_value_canonic (index); var_chg[index] = value; } } static int last_internal_var_id = 0; string alloc_internal_var() //! Allocates and returns a unique variable name in the special //! scope "_internal_", creating that scope if necessary. After this //! it's safe to use that variable for internal purposes in tags //! with the normal variable functions. No other variables in the //! "_internal_" scope should be accessed. //! //! @note //! The "_internal_" scope is currently hidden by default by //! @[list_scope] but otherwise there's no access restriction on it. //! Therefore an end user can get at the variables in that scope //! directly. On the other hand there's no guarantee that that will //! remain possible in the future, so no end user RXML code should //! use the "_internal_" scope. { if (!scopes->_internal_) add_scope ("_internal_", ([])); return (string) ++last_internal_var_id; } void signal_var_change (string var, void|string scope_name) //! Call this when the variable @[var] in the specified scope has //! changed in some other way than by calling a function in this //! class. If necessary, this will register the variable and its //! current value in generated p-code (see @[set_misc] for further //! details). The current scope is used if @[scope_name] is left //! out. { if (mapping var_chg = misc->variable_changes) { if (!scope_name) scope_name = "_"; var_chg[encode_value_canonic (({scope_name, var}))] = scopes[scope_name][var]; } } 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 ("Cannot handle plugin tags added at runtime.\n"); #endif if (!new_runtime_tags) new_runtime_tags = NewRuntimeTags(); if (mapping var_chg = misc->variable_changes) var_chg[encode_value_canonic (({0, tag->flags & FLAG_PROC_INSTR ? "?" + tag->name : tag->name}))] = tag; 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)) { proc_instr = tag->flags & FLAG_PROC_INSTR; tag = tag->name; } if (mapping var_chg = misc->variable_changes) var_chg[encode_value_canonic (({0, proc_instr ? "?" + tag : tag}))] = 0; new_runtime_tags->remove_tag (tag, proc_instr); } 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|PCode p_code_error) //! This function gets any exception that is catched during //! evaluation. evaluator is the object that catched the error. If //! p_code_error is set, a CompiledError object will be added to it //! if the error was reported. { error_count++; if (objectp (err)) { if (err->is_RXML_break_eval) { if (err->action == "continue") return; Context ctx = RXML_CONTEXT; if (ctx->frame) { if (stringp (err->target) ? err->target == ctx->frame->scope_name : err->target == ctx->frame) err->action = "continue"; } else if (err->target) { ctx->frame = err->cur_frame; err = catch (parse_error ("There is no surrounding frame %s.\n", stringp (err->target) ? sprintf ("with scope %O", err->target) : sprintf ("%O", err->target))); ctx->frame = 0; handle_exception (err, evaluator, p_code_error); } throw (err); } else if (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 (p_code_error) { CompiledError comp_err = CompiledError (err); p_code_error->add (RXML_CONTEXT, comp_err, comp_err); } return; } } throw (err); } } throw_fatal (err); } final array(mixed|PCode) eval_and_compile (Type type, string to_parse, void|int stale_safe, void|TagSet tag_set_override) //! Parses and evaluates @[to_parse] with @[type] in this context. //! At the same time, p-code is collected for later reevaluation. An //! array is returned which contains the result in the first element //! and the generated @[RXML.PCode] object in the second. If //! @[stale_safe] is nonzero, the p-code object will be an instance //! of @[RXML.RenewablePCode] instead, which never fails due to //! being stale. The tag set defaults to @[tag_set], but it may be //! overridden with @[tag_set_override]. { int orig_make_p_code = make_p_code, orig_state_updated = state_updated; int orig_top_frame_flags = frame && frame->flags; PCODE_UPDATE_MSG ("%O: Saved p-code update count %d before eval_and_compile\n", this_object(), orig_state_updated); if (!tag_set_override) tag_set_override = tag_set; make_p_code = 1; Parser parser = type->get_parser ( this_object(), tag_set_override, 0, stale_safe ? RenewablePCode (type, tag_set) : PCode (type, tag_set)); mixed res; PCode p_code; mixed err = catch { parser->write_end (to_parse); res = parser->eval(); p_code = parser->p_code; p_code->finish(); }; type->give_back (parser, tag_set_override); PCODE_UPDATE_MSG ("%O: Restoring p-code update count from %d to %d " "after eval_and_compile\n", this_object(), state_updated, orig_state_updated); make_p_code = orig_make_p_code, state_updated = orig_state_updated; if (frame) // The subevaluation might change the cache result control // flags, but they should be ignored since it's not the same // cache. These flags are set but never cleared, so we only need // to clear those that are cleared in orig_top_frame_flags. frame->flags &= orig_top_frame_flags | ~(FLAG_DONT_CACHE_RESULT|FLAG_MAY_CACHE_RESULT); 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 = _make_p_code); } #ifdef DEBUG private int eval_finished = 0; #endif final void eval_finish() // Called at the end of the evaluation in this context. { FRAME_DEPTH_MSG ("%*s%O eval_finish\n", frame_depth, "", this_object()); if (!frame_depth) { #ifdef DEBUG if (eval_finished) fatal_error ("Context already finished.\n"); eval_finished = 1; #endif if (tag_set) tag_set->call_eval_finish_funs (this_object()); if (p_code_comp) p_code_comp->compile(); // Fix all delayed resolves. } } 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 (mapping var_chg = misc->variable_changes) { CLEANUP_VAR_CHG_SCOPE (var_chg, "_"); if (string scope_name = frame->scope_name) CLEANUP_VAR_CHG_SCOPE (var_chg, scope_name); } 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 '?'. void direct_add_runtime_tag (string name, Tag tag) { if (mapping var_chg = misc->variable_changes) var_chg[encode_value_canonic (({0, name}))] = tag; runtime_tags[name] = tag; } void direct_remove_runtime_tag (string name) { if (mapping var_chg = misc->variable_changes) var_chg[encode_value_canonic (({0, name}))] = 0; m_delete (runtime_tags, name); } 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. int make_p_code; // Nonzero if the parsers should compile along with the evaluation. int state_updated; // Nonzero if the persistent state of the evaluated rxml has // changed. Never negative. PikeCompile p_code_comp; // The PikeCompile object for collecting any produce Pike byte code // during p-code compilation. static void create (void|TagSet _tag_set, void|RequestID _id) // Normally TagSet.`() should be used instead of this. { tag_set = _tag_set || empty_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".) mapping id_defines; // Ugly kludge: The old id->misc->defines is stored here if it's // overridden by the misc mapping above. See // rxml_tag_set->prepare_context. //! @ignore MARK_OBJECT_ONLY; //! @endignore 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; } } static class BreakEval (Frame|string target) // Used in frame break exceptions. { constant is_RXML_BreakEval = 1; string action = "break"; Frame cur_frame = RXML_CONTEXT->frame; } 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; array(mapping(string:mixed)) args; string current_var; array backtrace; static 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); args = allocate (context->frame_depth); Frame frame = context->frame; int i = 0; for (; frame; i++, frame = frame->up) { if (i >= sizeof (frames)) { frames += allocate (sizeof (frames) + 1); args += allocate (sizeof (args) + 1); } frames[i] = frame; args[i] = frame->args; } frames = frames[..i - 1]; args = args[..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; if (!no_msg) add ("RXML", type ? " " + type : "", " error"); if (context) { if (!no_msg) add (": ", msg || "(no error message)\n"); if (current_var && current_var != "") add (" | ", current_var, "\n"); for (int i = 0; i < sizeof (frames); i++) { Frame f = frames[i]; string name; if (f->format_rxml_backtrace_frame) { string res = f->format_rxml_backtrace_frame(); if (res != "") add (" | ", res, "\n"); } else { 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); mapping(string:mixed) argmap = args[i]; if (mappingp (argmap)) foreach (sort (indices (argmap)), string arg) { mixed val = argmap[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; } } mixed `[]= (int i, mixed val) { if (i == 0 && stringp (val)) { // Try to handle additional info being set in the error message. // This is very icky. The exception interface could be better.. :P string oldmsg = describe_rxml_backtrace(); if (has_prefix (val, oldmsg)) msg += val[sizeof (oldmsg)..]; else if (has_suffix (val, oldmsg)) msg = val[..sizeof (val) - sizeof (oldmsg) - 1] + msg; else msg = val; return val; } error ("Cannot set index %O to %O.\n", i, val); } 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 bein

Roxen.git/ server/ etc/ modules/ RXML.pmod/ module.pmod > 58a008b308396d05a1549001b273d98f7d2341e7 [Annotate]