Roxen.git/server/etc/modules/RXML.pmod/module.pmod:d1d94288f91d6791385887b03f9899b0dbf64e47

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10350 10351 10352 10353 10354 10355 10356 10357 10358 10359 10360 10361 10362 10363 10364 10365 10366 10367 10368 10369 10370 10371 10372 10373 10374 10375 10376 10377 10378 10379 10380 10381 10382 10383 10384 10385 10386 10387 10388 10389 10390 10391 10392 10393 10394 10395 10396 10397 10398 10399 10400 10401 10402 10403 10404 10405 10406 10407 10408 10409 10410 10411 10412 10413 10414 10415 10416 10417 10418 10419 10420 10421 10422 10423 10424 10425 10426 10427 10428 10429 10430 10431 10432 10433 10434 10435 10436 10437 10438 10439 10440 10441 10442 10443 10444 10445 10446 10447 10448 10449 // RXML parser and compiler framework. // // Created 1999-07-30 by Martin Stjernholm. // // $Id$ // Kludge: Must use "RXML.refs" somewhere for the whole module to be // loaded correctly. protected object Roxen; protected object roxen; //! 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. #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 RXML_PCODE_COMPACT_DEBUG // #define TAGSET_GENERATION_DEBUG #include <config.h> #include <module.h> #include <request_trace.h> #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) # define DO_IF_RXML_OBJ_DEBUG(X...) X #else # define MARK_OBJECT ; # define MARK_OBJECT_ONLY ; # define DO_IF_RXML_OBJ_DEBUG(X...) #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 // Tell Pike.count_memory this is global. constant pike_cycle_depth = 0; // Internal caches and object tracking // // This must be first so that it happens early in __INIT. protected int tag_set_count = 0; protected 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). protected 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) protected mapping(string:program/*(Parser)*/) reg_parsers = ([]); // Maps each parser name to the parser program. protected mapping(string:Type) reg_types = ([]); // Maps each type name to a type object with the PNone parser. protected 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. //! //! If an argument got a nonsequential type, it takes exactly one //! value. More than one value trigs a parse error. If no value is //! given (e.g. the attribute value is just an empty string) then a //! parse error is trigged if the argument is required, otherwise //! the argument is considered missing altogether. //! //! For instance, if you have @expr{@[opt_arg_types] = (["foo": //! RXML.t_int(RXML.PEnt)])@} then @expr{<my-tag foo=""/>@} is the //! same as @expr{<my-tag/>@} since the attribute value @expr{""@} //! contains no integer. //! //! The above does not apply to sequential types, since they always //! can be assigned an empty value. 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 are 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 @expr{@[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; #ifdef RXML_OBJ_DEBUG frame->__object_marker->create (frame); #endif 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; if (!ctx) ctx = RXML_CONTEXT; #ifdef MODULE_DEBUG if (mixed err = catch { #endif if (ignore_args) foreach (indices (args) - ignore_args, string arg) { Type t = atypes[arg] || def_arg_type; mixed v = t->eval_opt (args[arg], ctx); // Should not unwind. if (v == nil) set_nil_arg (args, arg, t, req_arg_types, ctx->id); else args[arg] = v; } else foreach (args; string arg; mixed val) { Type t = atypes[arg] || def_arg_type; mixed v = t->eval_opt (val, ctx); // Should not unwind. if (v == nil) set_nil_arg (args, arg, t, req_arg_types, ctx->id); else args[arg] = v; } #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: // We assume these objects always are globally referenced. constant pike_cycle_depth = 0; #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_RXML_OBJ_DEBUG (_frame->__object_marker->create (_frame)); \ 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 (frame %O): Restoring p-code update count " \ "from %d to %d since the frame is stored unevaluated " \ "due to exception.\n", \ _ctx, _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 && result != empty) 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 && result != empty) 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 (raw_args; string arg; string val) { 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 (val), parser); parser->finish (val); // Should not unwind. mixed v = parser->eval(); // Should not unwind. t->give_back (parser, ctx->tag_set); if (v == nil) set_nil_arg (raw_args, arg, t, req_arg_types, ctx->id); else raw_args[arg] = v; TAG_DEBUG (RXML_CONTEXT->frame, "Setting dynamic argument %s to %s\n", format_short (arg), format_short (val)); } } #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 (void|int flag) { return flag == 'O' && ((function_name (object_program (this)) || "RXML.Tag") + "(" + [string] this->name + (this->plugin_name ? "#" + [string] this->plugin_name : "") + ([int] this->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. //! @decl 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. protected 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(), ...})); //! @endcode //! //! "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. //! //! Note that creating a tag set at runtime when a @[Frame] is //! created doesn't work with p-code generation. If you think you //! need to do that then you should probably take a look at //! @[Frame.parent_frame] instead. { if (RXML_CONTEXT && (!RXML_CONTEXT->id || !RXML_CONTEXT->id->misc->disable_tag_set_creation_warning)) { report_debug ( "Warning: Tag set %O in %O created during RXML evaluation.\n" "This doesn't work with p-code generation and should be avoided.\n", name_, owner_); #ifdef MODULE_DEBUG array bt = backtrace(); report_debug (describe_backtrace (bt/*[sizeof (bt) - 6..]*/)); #endif } // Note: Some code duplication wrt CompositeTagSet.create. 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; tag->tagset = this_object(); #ifdef RXML_OBJ_DEBUG // The object marker might not have gotten the proper name from // Tag._sprintf so try to give it a better string now. tag->__object_marker->create (tag); #endif 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(); #ifdef RXML_OBJ_DEBUG // The object marker might not have gotten the proper name from // Tag._sprintf so try to give it a better string now. tag->__object_marker->create (tag); #endif } 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 nonpersistent case it's much more efficient to use //! @[generation] to track changes in the tag set. { if (!hash) hash = Crypto.MD5.hash (encode_value_canonic (get_hash_data())); 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. { // Soft cast due to circular forward reference. // Will hopefully be resolved with the next generation compiler. return [object(Parser)](mixed) 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: // We assume these objects always are globally referenced. constant pike_cycle_depth = 0; 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; } protected void destroy() { catch (changed()); if (name && global::this) SET_TAG_SET (owner, name, generation); } protected 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; } } protected mapping(string:Tag) tags = ([]), proc_instrs; // Static since we want to track changes in these. protected mapping(string:string) string_entities; // Used by e.g. PXml to hold normal entities that should be replaced // during parsing. protected TagSet top_tag_set; // The imported tag set with the highest priority. protected int got_local_tags; // Nonzero if there are local element tags or PI tags. protected array(function(:void)) notify_funcs = ({}); // Weak (when nonempty). protected array(function(Context:void)) prepare_funs; protected multiset(TagSet) dep_tag_sets = set_weak_flag ((<>), 1); /*protected*/ 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); } protected array(function(Context:void)) eval_finish_funs; /*protected*/ 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 (this->eval_finish) funs += ({this->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); } protected mapping(Tag:Tag) overridden_tag_lookup; /*protected*/ 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; } /*protected*/ 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; } protected mapping(string:mapping(string:Tag)) plugins, pi_plugins; /*protected*/ 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 (tags; string name; Tag tag) if (has_prefix (name, prefix)) if (tag->plugin_name) res[[string] tag->plugin_name] = tag; // We don't cache in plugins; do that only at the top level. } /*protected*/ 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 (proc_instrs; string name; Tag tag) if (name[..sizeof (prefix) - 1] == prefix) if (tag->plugin_name) res[[string] tag->plugin_name] = tag; // We don't cache in pi_plugins; do that only at the top level. } protected string hash; /*protected*/ array get_hash_data() { return ({ this_object()->prefix, this_object()->prefix_req, mkmultiset (indices (tags)), proc_instrs && mkmultiset (indices (proc_instrs)), string_entities, }) + imported->get_hash_data() + ({0}) + (indices (dep_tag_sets) - ({0}))->get_hash_data(); } /*protected*/ string tag_set_component_names() { return name || sizeof (imported) && imported->tag_set_component_names() * "+"; } string _sprintf (void|int flag) { if (flag != 'O') return 0; return (function_name (object_program (this)) || "RXML.TagSet") + "(" + // No, the owner isn't written unambiguously; we try to be brief here. (string) (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); } protected class CompositeTagSet { inherit TagSet; protected void create (TagSet... tag_sets) { // Note: Some code duplication wrt TagSet.create. id_number = ++tag_set_count; #ifdef RXML_OBJ_DEBUG __object_marker->create (this_object()); #endif // Make sure TagSet::`-> gets called. this->imported = tag_sets; } string _sprintf (void|int flag) { if (flag != 'O') return 0; return "RXML.CompositeTagSet(" + tag_set_component_names() + ")" + OBJ_COUNT; //return "RXML.TagSet(" + id_number + ")" + OBJ_COUNT; } } protected mapping(int|string:CompositeTagSet) garb_composite_tag_set_cache() { call_out (garb_composite_tag_set_cache, 30*60); return composite_tag_set_cache = ([]); } protected mapping(int|string:CompositeTagSet) 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])) \ /* Race, but it doesn't matter. */ \ res = composite_tag_set_cache[hash] = CompositeTagSet (a, b); \ } while (0) 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 an object with an @[rmxl_var_eval] function is returned, then //! that function is called in turn to produce the real value. As a //! special case, if @[rxml_var_eval] returns this object, the //! object itself is used as 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 //! @expr{@[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; //! @endcode //! //! Also, by letting the producer know the type context of the value //! and handle the type conversion, it's possible for t

Roxen.git/ server/ etc/ modules/ RXML.pmod/ module.pmod > d1d94288f91d6791385887b03f9899b0dbf64e47 [Annotate]