Roxen.git/server/etc/modules/RXML.pmod/module.pmod:11f192e510855da3c5afb8a602db7d388303da08

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RXML parser and compiler framework. //! //! Created 1999-07-30 by Martin Stjernholm. //! //! $Id: module.pmod,v 1.62 2000/02/15 15:55:35 nilsson Exp $ //! Kludge: Must use "RXML.refs" somewhere for the whole module to be //! loaded correctly. //! WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING //! WARNING WARNING //! WARNING This API is not yet set in stone. WARNING //! WARNING Expect incompatible changes. WARNING //! WARNING WARNING //! WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING //#pragma strict_types // Disabled for now since it doesn't work well enough. #ifdef OBJ_COUNT_DEBUG // This debug mode gives every object a unique number in the // _sprintf() string. # define DECLARE_CNT(count) static int count = ++all_constants()->_obj_count # define PAREN_CNT(count) ("(" + (count) + ")") # define COMMA_CNT(count) ("," + (count)) #else # define DECLARE_CNT(count) # define PAREN_CNT(count) "" # define COMMA_CNT(count) "" #endif #define OLD_RXML_COMPAT // Glä! class Tag //! Interface class for the static information about a tag. { constant is_RXML_Tag = 1; //! Interface. //!string name; //! The name of the tag. Required and considered constant. /*extern*/ int flags; //! Various bit flags that affect parsing; see the FLAG_* constants. //! RXML.Frame.flags is initialized from this. mapping(string:Type) req_arg_types = ([]); mapping(string:Type) opt_arg_types = ([]); //! The names and types of the required and optional arguments. If a //! type specifies a parser, it'll be used on the argument value. //! Note that the order in which arguments are parsed is arbitrary. Type def_arg_type = t_text (PEnt); //! The type used for arguments that isn't present in neither //! req_arg_types nor opt_arg_types. This default is a parser that //! only parses XML-style entities. Type content_type = t_same (PXml); //! The handled type of the content, if the tag gets any. //! //! This default is the special type t_same, which means the type is //! taken from the effective type of the result. The PXml argument //! causes the standard XML parser to be used to read it, which //! means that the content is preparsed with XML syntax. Use no //! parser to get the raw text. array(Type) result_types = ({t_xml, t_html, t_text}); //! The possible types of the result, in order of precedence. If a //! result type has a parser, it'll be used to parse any strings //! gotten from Frame.do_return (see that function for details). //!program Frame; //!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. //!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 Tag object //! instead of handling the actual tags of its own. It works as //! follows: //! //! o 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. //! //! o 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. //! //! o plugin_name is the name of the plugin. It's used as index in //! the mapping that the Frame.get_plugins() returns. //! //! o The plugin tag is registered in the tag set with the //! identifier //! //! 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 -- //! '#' should never be used in normal tag names. //! //! o It's not an error to register a plugin for which there is no //! socket. Such plugins are simply ignored. //! Services. inline 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_return(). The //! argument values and the content are normally not parsed. //! //! Note: Never reuse the same frame object. { Tag this = this_object(); object/*(Frame)HMM*/ frame = ([function(:object/*(Frame)HMM*/)] this->Frame)(); frame->tag = this; frame->flags = flags; frame->args = args; if (!zero_type (content)) frame->content = content; return frame; } int eval_args (mapping(string:mixed) args, void|int dont_throw, void|Context ctx) //! 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 not touched. RXML errors, such as missing //! argument, are thrown if dont_throw is zero or left out, //! otherwise zero is returned for such errors. ctx specifies the //! context to use; it defaults to the current context. { // Note: Code duplication in Frame._eval(). 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 (atypes), string arg) args[arg] = atypes[arg]->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. array _handle_tag (TagSetParser parser, mapping(string:string) args, void|string content) // Callback for tag set parsers. Returns a sequence of result values // to be added to the result queue. Note that this function handles // an unwind frame for the parser. { Context ctx = parser->context; // FIXME: P-code generation. if (string splice_args = args["::"]) { // Somewhat kludgy solution for the time being. splice_args = t_text (PEnt)->eval (splice_args, ctx, 0, parser, 1); m_delete (args, "::"); args += parser->parse_tag_args (splice_args); } object/*(Frame)HMM*/ frame; if (mapping(string:mixed)|mapping(object:array) 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; } else frame = `() (args, Void); else frame = `() (args, Void); mixed err = catch { frame->_eval (parser, args, content); mixed res; if ((res = frame->result) == Void) return ({}); if (frame->result_type->quoting_scheme != parser->type->quoting_scheme) res = parser->type->quote (res); return ({res}); }; if (objectp (err) && ([object] err)->thrown_at_unwind) { mapping(string:mixed)|mapping(object:array) ustate = ctx->unwind_state; if (!ustate) ustate = ctx->unwind_state = ([]); #ifdef DEBUG if (err != frame) fatal_error ("Internal error: Unexpected unwind object catched.\n"); if (ustate[parser]) fatal_error ("Internal error: Clobbering unwind state for parser.\n"); #endif ustate[parser] = ({err}); throw (err = parser); } else throw_fatal (err); } DECLARE_CNT (__count); string _sprintf() { return "RXML.Tag(" + [string] this_object()->name + COMMA_CNT (__count) + ")"; } } class TagSet //! Contains a set of tags. Tag sets can import other tag sets, and //! later changes 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. { string name; //! Used for identification only. string prefix; //! A namespace prefix that may precede the tags. If it's zero, it's //! up to the importing tag set(s). A ':' is always inserted between //! the prefix and the tag name. int prefix_req; //! The prefix must precede the tags. array(TagSet) imported = ({}); //! Other tag sets that will be used. The precedence is local tags //! first, then imported from left to right. It's not safe to //! destructively change entries in this array. function(Context:void) prepare_context; //! If set, this is a function that will be called before a new //! Context object is taken into use. It'll typically prepare //! predefined scopes and variables. The functions will be called in //! order of precedence; highest last. int generation = 1; //! A number that is increased every time something changes in this //! object or in some tag set it imports. #define LOW_TAG_TYPE \ string|array| \ function(:int(1..1)|string|array)| \ function(object,mapping(string:string):int(1..1)|string|array) #define LOW_CONTAINER_TYPE \ string|array| \ function(:int(1..1)|string|array)| \ function(object,mapping(string:string),string:int(1..1)|string|array) #define LOW_ENTITY_TYPE \ string|array| \ function(:int(1..1)|string|array)| \ function(object:int(1..1)|string|array) mapping(string:LOW_TAG_TYPE) low_tags; mapping(string:LOW_CONTAINER_TYPE) low_containers; mapping(string:LOW_ENTITY_TYPE) low_entities; //! Passed directly to Parser.HTML when that parser is used. This is //! intended for compatibility only and might eventually be removed. //! Note: Changes in these aren't tracked; changed() must be called. static void create (string _name, void|array(Tag) _tags) //! { name = _name; if (_tags) foreach (_tags, Tag tag) if (tag->plugin_name) tags[tag->name + "#" + tag->plugin_name] = tag; else tags[tag->name] = tag; } void add_tag (Tag tag) //! { 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) if (tag->plugin_name) tags[tag->name + "#" + tag->plugin_name] = tag; else tags[tag->name] = tag; changed(); } void remove_tag (string|Tag tag) //! { if (stringp (tag)) m_delete (tags, tag); else for (string n; !zero_type (n = search (tags, [object(Tag)] tag));) m_delete (tags, n); changed(); } local Tag|array(LOW_TAG_TYPE|LOW_CONTAINER_TYPE) get_local_tag (string name) //! Returns the tag definition for the given name in this tag set. //! The return value is either a Tag object or an array ({low_tag, //! low_container}), where one element always is zero. { if (Tag tag = tags[name]) return tag; else if (LOW_CONTAINER_TYPE cdef = low_containers && low_containers[name]) return ({0, cdef}); else if (LOW_TAG_TYPE tdef = low_tags && low_tags[name]) return ({tdef, 0}); else return 0; } array(Tag) get_local_tags() //! Doesn't return the low tag/container definitions. { return values (tags); } Tag|array(LOW_TAG_TYPE|LOW_CONTAINER_TYPE) get_tag (string name) //! Returns the active tag definition for the given name. The return //! value is the same as for get_local_tag(). { if (object(Tag)|array(LOW_TAG_TYPE|LOW_CONTAINER_TYPE) def = get_local_tag (name)) return def; foreach (imported, TagSet tag_set) if (object(Tag) tag = [object(Tag)] tag_set->get_tag (name)) return tag; return 0; } Tag|array(LOW_TAG_TYPE|LOW_CONTAINER_TYPE) get_overridden_tag ( Tag|LOW_TAG_TYPE|LOW_CONTAINER_TYPE tagdef, void|string name) //! Returns the tag definition that the given one overrides, or zero //! if none. tag is a Tag object or a low tag/container definition. //! In the latter case, the tag name must be given as the second //! argument. The return value is the same as for get_local_tag(). { if (objectp (tagdef) && ([object] tagdef)->is_RXML_Tag) name = [string] ([object] tagdef)->name; #ifdef MODULE_DEBUG if (!name) fatal_error ("Need tag name.\n"); #endif if (tags[name] == tagdef || (low_containers && low_containers[name] == tagdef) || (low_tags && low_tags[name] == tagdef)) { foreach (imported, TagSet tag_set) if (object(Tag)|array(LOW_TAG_TYPE|LOW_CONTAINER_TYPE) tagdef = tag_set->get_tag (name)) return tagdef; } else { int found = 0; foreach (imported, TagSet tag_set) if (object(Tag)|array(LOW_TAG_TYPE|LOW_CONTAINER_TYPE) subtag = tag_set->get_tag (name)) if (found) return subtag; else if (arrayp (subtag) ? subtag[0] == tagdef || subtag[1] == tagdef : subtag == tagdef) if ((subtag = tag_set->get_overridden_tag (tagdef, name))) return subtag; else found = 1; } return 0; } array(Tag|array(LOW_TAG_TYPE|LOW_CONTAINER_TYPE)) get_overridden_tags (string name) //! Returns all tag definitions for the given name, i.e. including //! the overridden ones. A tag to the left overrides one to the //! right. The elements in the returned array are the same as for //! get_local_tag(). { if (object(Tag)|array(LOW_TAG_TYPE|LOW_CONTAINER_TYPE) def = get_local_tag (name)) return ({def}) + imported->get_overridden_tags (name) * ({}); else return imported->get_overridden_tags (name) * ({}); } multiset(string) get_tag_names() //! { multiset(string) res = (multiset) indices (tags); if (low_tags) res |= (multiset) indices (low_tags); if (low_containers) res |= (multiset) indices (low_containers); return `| (res, @imported->get_tag_names()); } mapping(string:Tag) get_plugins (string name) //! Returns the registered plugins for the given tag name. Don't be //! destructive on the returned mapping. { mapping(string:Tag) res; if ((res = plugins[name])) return res; low_get_plugins (name + "#", res = ([])); return plugins[name] = res; } mixed `->= (string var, mixed val) { switch (var) { case "imported": if (!val) return val; // Pike can call us with 0 as part of an optimization. filter (imported, "dont_notify", changed); imported = [array(TagSet)] val; imported->do_notify (changed); break; default: ::`->= (var, val); } changed(); return val; } mixed `[]= (string var, mixed val) {return `->= (var, val);} Parser `() (Type top_level_type, void|RequestID id) //! Creates a new context for parsing content of the specified type, //! and returns the parser object for it. id is put into the //! context. { Context ctx = Context (this_object(), id); if (!prepare_funs) prepare_funs = get_prepare_funs(); (prepare_funs -= ({0})) (ctx); return ctx->new_parser (top_level_type); } void changed() //! Should be called whenever something is changed. Done //! automatically most of the time, however. { generation++; prepare_funs = 0; plugins = ([]); (notify_funcs -= ({0}))(); set_weak_flag (notify_funcs, 1); } // Internals. void do_notify (function(:void) func) { notify_funcs |= ({func}); set_weak_flag (notify_funcs, 1); } void dont_notify (function(:void) func) { notify_funcs -= ({func}); set_weak_flag (notify_funcs, 1); } void destroy() { catch (changed()); } static mapping(string:Tag) tags = ([]); // Private since we want to track changes in this. static array(function(:void)) notify_funcs = ({}); // Weak (when nonempty). static array(function(Context:void)) prepare_funs; /*static*/ array(function(Context:void)) get_prepare_funs() { if (prepare_funs) return prepare_funs; array(function(Context:void)) funs = ({}); for (int i = sizeof (imported) - 1; i >= 0; i--) funs += imported[i]->get_prepare_funs(); if (prepare_context) funs += ({prepare_context}); // We don't cache in prepare_funs; do that only at the top level. return funs; } void call_prepare_funs (Context ctx) // Kludge function used from rxml.pike. { if (!prepare_funs) prepare_funs = get_prepare_funs(); (prepare_funs -= ({0})) (ctx); } static mapping(string:mapping(string:Tag)) plugins = ([]); /*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. } DECLARE_CNT (__count); string _sprintf() { return name ? "RXML.TagSet(" + name + COMMA_CNT (__count) + ")" : "RXML.TagSet" + PAREN_CNT (__count); } } TagSet empty_tag_set; //! The empty tag set. class Value //! Interface for objects used as variable values that are evaluated //! when referenced. { mixed rxml_var_eval (Context ctx, string var, string scope_name, void|Type type) //! This is called to get the value of the variable. ctx, var and //! scope_name are set to where this Value object was found. //! //! 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 type->convert(value), //! since that function does just that. { 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 could be used instead of rxml_var_eval. string _sprintf() {return "RXML.Value";} } class Scope //! Interface for objects that emulates a scope mapping. { mixed `[] (string var, void|Context ctx, void|string scope_name) {parse_error ("Cannot query variable" + _in_the_scope (scope_name) + ".\n");} mixed `[]= (string var, mixed val, void|Context ctx, void|string scope_name) {parse_error ("Cannot set variable" + _in_the_scope (scope_name) + ".\n");} array(string) _indices (void|Context ctx, void|string scope_name) {parse_error ("Cannot list variables" + _in_the_scope (scope_name) + ".\n");} void m_delete (string var, void|Context ctx, void|string scope_name) {parse_error ("Cannot delete variable" + _in_the_scope (scope_name) + ".\n");} 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";} } #define SCOPE_TYPE mapping(string:mixed)|object(Scope) class Context //! A parser context. This contains the current variable bindings and //! so on. The current context can always be retrieved with //! get_context(). //! //! Note: Don't store pointers to this object since that will likely //! introduce circular references. It can be retrieved easily through //! get_context() or parser->context. { Frame frame; //! The currently evaluating frame. RequestID id; //! int type_check; //! Whether to do type checking. int error_count; //! Number of RXML errors that has occurred. TagSet tag_set; //! The current tag set that will be inherited by subparsers. int tag_set_is_local; //! Nonzero if tag_set is a copy local to this context. A local tag //! set that imports the old tag set is created whenever need be. #ifdef OLD_RXML_COMPAT int compatible_scope = 0; //! If set, the default scope is form, otherwise it is the present //! scope. #endif array parse_user_var (string var, void|string scope_name) //! Tries to decide what variable and scope to use. Handles cases //! where the variable also contains the scope, e.g. "scope.var". { if(!var || !sizeof(var)) return ([])[0]; array(string) splitted=var/"."; if(sizeof(splitted)>2) splitted[-1] = splitted[1..]*"."; if(sizeof(splitted)==2) scope_name=splitted[0]; #ifdef OLD_RXML_COMPAT else if (compatible_scope) scope_name = scope_name || "form"; #endif else scope_name = scope_name || "_"; return ({ scope_name, splitted[-1] }); } local mixed get_var (string var, void|string scope_name, void|Type want_type) //! Returns the value a variable in the specified scope, or the //! current scope if none is given. Returns zero with zero_type 1 if //! there's no such variable. //! //! If the type argument is set, the value is converted to that type //! with Type.convert(). If the value can't be converted, an RXML //! error is thrown. { if (SCOPE_TYPE vars = scopes[scope_name || "_"]) { mixed val; if (objectp (vars)) { if (zero_type (val = ([object(Scope)] vars)->`[] ( var, this_object(), scope_name || "_")) || val == Void) return ([])[0]; } else if (zero_type (val = vars[var])) return ([])[0]; if (objectp (val) && ([object] val)->rxml_var_eval) { return zero_type (val = ([object(Value)] val)->rxml_var_eval ( this_object(), var, scope_name || "_", want_type)) || val == Void ? ([])[0] : val; } else if (want_type) return // FIXME: Some system to find out the source type? zero_type (val = want_type->convert (val)) || val == Void ? ([])[0] : val; else return val; } else if (scope_name) parse_error ("Unknown scope %O.\n", scope_name); else parse_error ("No current scope.\n"); } mixed user_get_var (string var, void|string scope_name, void|Type want_type) //! As get_var, but can handle cases where the variable also //! contains the scope, e.g. "scope.var". { if(!var || !sizeof(var)) return ([])[0]; array(string) splitted=var/"."; if(sizeof(splitted)>2) splitted[-1] = splitted[1..]*"."; if(sizeof(splitted)==2) scope_name=splitted[0]; #ifdef OLD_RXML_COMPAT else if (compatible_scope) scope_name = scope_name || "form"; #endif else scope_name = scope_name || "_"; return get_var(splitted[-1], scope_name, want_type); } local mixed set_var (string 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 (SCOPE_TYPE vars = scopes[scope_name || "_"]) if (objectp (vars)) return ([object(Scope)] vars)->`[]= (var, val, this_object(), scope_name || "_"); else return vars[var] = val; else if (scope_name) parse_error ("Unknown scope %O.\n", scope_name); else parse_error ("No current scope.\n"); } mixed user_set_var (string var, mixed val, void|string scope_name) //! As set_var, but can handle cases where the variable also //! contains the scope, e.g. "scope.var". { if(!var || !sizeof(var)) parse_error ("No variable specified.\n"); array(string) splitted=var/"."; if(sizeof(splitted)>2) splitted[-1] = splitted[1..]*"."; if(sizeof(splitted)==2) scope_name=splitted[0]; #ifdef OLD_RXML_COMPAT else if (compatible_scope) scope_name = scope_name || "form"; #endif else scope_name = scope_name || "_"; return set_var(splitted[-1], val, scope_name); } local void delete_var (string var, void|string scope_name) //! Removes a variable in the specified scope, or the current scope //! if none is given. { if (SCOPE_TYPE vars = scopes[scope_name || "_"]) if (objectp (vars)) ([object(Scope)] vars)->m_delete (var, this_object(), scope_name || "_"); else m_delete ([mapping(string:mixed)] vars, var); else if (scope_name) parse_error ("Unknown scope %O.\n", scope_name); else parse_error ("No current scope.\n"); } void user_delete_var (string var, void|string scope_name) //! As delete_var, but can handle cases where the variable also //! contains the scope, e.g. "scope.var". { if(!var || !sizeof(var)) return; array(string) splitted=var/"."; if(sizeof(splitted)>2) splitted[-1] = splitted[1..]*"."; if(sizeof(splitted)==2) scope_name=splitted[0]; #ifdef OLD_RXML_COMPAT else if (compatible_scope) scope_name = scope_name || "form"; #endif else scope_name = scope_name || "_"; delete_var(splitted[-1], scope_name); } 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 (scope_name) parse_error ("Unknown scope %O.\n", scope_name); else parse_error ("No current scope.\n"); } array(string) list_scopes() //! Returns the names of all defined scopes. { return indices (scopes) - ({"_"}); } int exist_scope (void|string scope_name) //! { return !!scopes[scope_name || "_"]; } void add_scope (string scope_name, SCOPE_TYPE vars) //! Adds or replaces the specified scope at the global level. A //! scope can be a mapping or a Scope object. A global "_" scope may //! also be defined this way. { if (scopes[scope_name]) if (scope_name == "_") { array(SCOPE_TYPE) hid; for (Frame f = frame; f; f = f->up) if (array(SCOPE_TYPE) h = hidden[f]) hid = h; if (hid) hid[0] = vars; else scopes["_"] = vars; } else { Frame outermost; for (Frame f = frame; f; f = f->up) if (f->scope_name == scope_name) outermost = f; if (outermost) hidden[outermost][1] = vars; else scopes[scope_name] = vars; } else scopes[scope_name] = vars; } int extend_scope (string scope_name, SCOPE_TYPE vars) //! Adds or extends the specified scope at the global level. //! Returns 1 on success and 0 on failure. { if (scopes[scope_name]) { SCOPE_TYPE oldvars; if (scope_name == "_") { array(SCOPE_TYPE) hid; for (Frame f = frame; f; f = f->up) if (array(SCOPE_TYPE) h = hidden[f]) hid = h; if (hid) oldvars = hid[0]; else oldvars = scopes["_"]; } else { Frame outermost; for (Frame f = frame; f; f = f->up) if (f->scope_name == scope_name) outermost = f; if (outermost) oldvars = hidden[outermost][1]; else oldvars = scopes[scope_name]; } #ifdef DEBUG if (!oldvars) fatal_error ("Internal error: I before e except after c.\n"); #endif if (!mappingp(vars)) { return 0; } foreach (indices(vars), string var) set_var(var, vars[var], scope_name); } else scopes[scope_name] = vars; return 1; } void remove_scope (string scope_name) //! Removes the named scope from the global level, if it exists. { #ifdef MODULE_DEBUG if (scope_name == "_") fatal_error ("Cannot remove current scope.\n"); #endif Frame outermost; for (Frame f = frame; f; f = f->up) if (f->scope_name == scope_name) outermost = f; if (outermost) m_delete (hidden, outermost); else m_delete (scopes, scope_name); } string current_scope() //! Returns the name of the current scope, if it has any. { if (SCOPE_TYPE vars = scopes["_"]) { string scope_name; while (scope_name = search (scopes, vars, scope_name)) if (scope_name != "_") return scope_name; } return 0; } void add_runtime_tag (Tag tag) //! Adds a tag that will exist from this point forward in the //! current context only. { if (!new_runtime_tags) new_runtime_tags = NewRuntimeTags(); new_runtime_tags->add_tags[tag] = 1; // By doing the following, we can let remove_tags take precedence. new_runtime_tags->remove_tags[tag] = 0; new_runtime_tags->remove_tags[tag->name] = 0; } void remove_runtime_tag (string|Tag tag) //! Removes a tag added by add_runtime_tag(). { if (!new_runtime_tags) new_runtime_tags = NewRuntimeTags(); new_runtime_tags->remove_tags[tag] = 1; } multiset(Tag) get_runtime_tags() //! Returns all currently active runtime tags. Don't be destructive //! on the returned multiset. { multiset(Tag) tags = runtime_tags; if (new_runtime_tags) { tags |= new_runtime_tags->add_tags; tags -= new_runtime_tags->remove_tags; } return tags; } void handle_exception (mixed err, PCode|Parser evaluator) //! This function gets any exception that is catched during //! evaluation. evaluator is the object that catched the error. { error_count++; if (objectp (err) && err->is_RXML_Backtrace && err->type != "fatal") { string msg; for (object(PCode)|object(Parser) e = evaluator->_parent; e; e = e->_parent) e->error_count++; if (id && id->conf) msg = (err->type == "run" ? ([function(Backtrace,Type:string)] ([object] id->conf)->handle_run_error) : ([function(Backtrace,Type:string)] ([object] id->conf)->handle_parse_error) ) ([object(Backtrace)] err, evaluator->type); else { #ifdef MODULE_DEBUG report_notice (describe_backtrace (err)); #else report_notice (err->msg); #endif } if (msg) while (evaluator) { if (evaluator->report_error && evaluator->type->free_text && evaluator->report_error (msg)) break; evaluator = evaluator->_parent; } } else throw_fatal (err); } // Internals. string current_var; // Used to get the parsed variable into the RXML error backtrace. Parser new_parser (Type top_level_type) // Returns a new parser object to start parsing with this context. // Normally TagSet.`() should be used instead of this. { #ifdef MODULE_DEBUG if (in_use || frame) fatal_error ("Context already in use.\n"); #endif return top_level_type->get_parser (this_object()); } mapping(string:SCOPE_TYPE) scopes = ([]); // The variable mappings for every currently visible scope. A // special entry "_" points to the current local scope. mapping(Frame:array(SCOPE_TYPE)) hidden = ([]); // The currently hidden scopes. The indices are frame objects which // introduce scopes. The values are tuples of the current scope and // the named scope they hide. void enter_scope (Frame frame) { #ifdef DEBUG if (!frame->vars) fatal_error ("Internal error: Frame has no variables.\n"); #endif if (string scope_name = [string] frame->scope_name) { if (!hidden[frame]) hidden[frame] = ({scopes["_"], scopes[scope_name]}); scopes["_"] = scopes[scope_name] = [SCOPE_TYPE] frame->vars; } else { if (!hidden[frame]) hidden[frame] = ({scopes["_"], 0}); scopes["_"] = [SCOPE_TYPE] frame->vars; } } void leave_scope (Frame frame) { if (array(SCOPE_TYPE) back = hidden[frame]) { if (SCOPE_TYPE cur = back[0]) scopes["_"] = cur; else m_delete (scopes, "_"); if (SCOPE_TYPE named = back[1]) { #ifdef MODULE_DEBUG if (!stringp (frame->scope_name)) fatal_error ("Scope named changed to %O during parsing.\n", frame->scope_name); #endif scopes[[string] frame->scope_name] = named; } else m_delete (scopes, [string] frame->scope_name); m_delete (hidden, frame); } } #define ENTER_SCOPE(ctx, frame) (frame->vars && ctx->enter_scope (frame)) #define LEAVE_SCOPE(ctx, frame) (frame->vars && ctx->leave_scope (frame)) void make_tag_set_local() { if (!tag_set_is_local) { TagSet new_tag_set = TagSet (tag_set->name + " (local)"); // FIXME: Cache this? new_tag_set->imported = ({tag_set}); tag_set = new_tag_set; tag_set_is_local = 1; } } multiset(Tag) runtime_tags = (<>); class NewRuntimeTags { multiset(Tag) add_tags = (<>); multiset(Tag|string) remove_tags = (<>); } NewRuntimeTags new_runtime_tags; // Used to record the result of any add_runtime_tag() and // remove_runtime_tag() calls since the last time the parsers ran. void create (TagSet _tag_set, void|RequestID _id) // Normally TagSet.`() should be used instead of this. { tag_set = _tag_set; id = _id; } mapping(string:mixed)|mapping(object:array) 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_return() with this stream piece.) // "exec_left": array (Exec array left to evaluate. Only used // between Frame._exec_array() and Frame._eval().) DECLARE_CNT (__count); string _sprintf() {return "RXML.Context" + PAREN_CNT (__count);} #ifdef MODULE_DEBUG #if constant (thread_create) Thread.Thread in_use; #else int in_use; #endif #endif } class Backtrace //! The object used to throw RXML errors. { constant is_generic_error = 1; constant is_RXML_Backtrace = 1; string type; // Currently "run" or "parse". string msg; Context context; Frame frame; string current_var; array backtrace; void create (string _type, string _msg, void|Context _context) { type = _type; msg = _msg; if (context = _context || get_context()) { frame = context->frame; current_var = context->current_var; } backtrace = predef::backtrace(); backtrace = backtrace[..sizeof (backtrace) - 2]; } string describe_rxml_backtrace (void|int no_msg) //! Returns a formatted RXML frame backtrace. { string txt = no_msg ? "" : "RXML " + type + " error"; if (context) { if (!no_msg) txt += ": " + (msg || "(no error message)\n"); txt += current_var ? " | &" + current_var + ";\n" : ""; for (Frame f = frame; f; f = f->up) { if (f->tag) txt += " | <" + f->tag->name; else if (!f->up) break; else txt += " | <(unknown tag)"; if (f->args) foreach (sort (indices (f->args)), string arg) { mixed val = f->args[arg]; txt += " " + arg + "="; if (arrayp (val)) txt += map (val, error_print_val) * ","; else txt += error_print_val (val); } else txt += " (no argmap)"; txt += ">\n"; } } else if (!no_msg) txt += " (no context): " + (msg || "(no error message)\n"); return txt; } private string error_print_val (mixed val) { if (arrayp (val)) return "array"; else if (mappingp (val)) return "mapping"; else if (multisetp (val)) return "multiset"; else return sprintf ("%O", val); } string|array `[] (int i) { switch (i) { case 0: return describe_rxml_backtrace(); case 1: return backtrace; } } string _sprintf() {return "RXML.Backtrace(" + type + ")";} } //! Current context. //! It's set before any function in RXML.Tag or RXML.Frame is called. #if constant (thread_create) private Thread.Local _context = thread_local(); inline void set_context (Context ctx) {_context->set (ctx);} inline Context get_context() {return [object(Context)] _context->get();} #else private Context _context; inline void set_context (Context ctx) {_context = ctx;} inline Context get_context() {return _context;} #endif #if defined (MODULE_DEBUG) && constant (thread_create) // Got races in this debug check, but looks like we have to live with that. :\ #define ENTER_CONTEXT(ctx) \ Context __old_ctx = get_context(); \ set_context (ctx); \ if (ctx) { \ if (ctx->in_use && ctx->in_use != this_thread()) \ fatal_error ("Attempt to use context asynchronously.\n"); \ ctx->in_use = this_thread(); \ } #define LEAVE_CONTEXT() \ if (Context ctx = get_context()) \ if (__old_ctx != ctx) ctx->in_use = 0; \ set_context (__old_ctx); #else #define ENTER_CONTEXT(ctx) \ Context __old_ctx = get_context(); \ set_context (ctx); #define LEAVE_CONTEXT() \ set_context (__old_ctx); #endif //! Constants for the bit field RXML.Frame.flags. constant FLAG_NONE = 0x00000000; //! The no-flags flag. In case you think 0 is too ugly. ;) //! Static flags (i.e. tested in the Tag object). constant FLAG_NONCONTAINER = 0x00000001; //! If set, the tag does not use any content. E.g. with a HTML parser //! this defines whether the tag is a container or not, and in XML //! parsing it simply causes the content (if any) to be thrown away. constant FLAG_NO_PREFIX = 0x00000002; //! Never apply any prefix to this tag. constant FLAG_SOCKET_TAG = 0x0000004; //! Declare the tag to be a socket tag, which accepts plugin tags (see //! Tag.plugin_name for details). constant FLAG_DONT_PREPARSE = 0x00000040; //! Don't preparse the content with the PXml parser. This is only used //! in the simple tag wrapper. Defined here as placeholder. constant FLAG_POSTPARSE = 0x00000080; //! Postparse the result with the PXml parser. This is only used in //! the simple tag wrapper. Defined here as placeholder. //! The rest of the flags are dynamic (i.e. tested in the Frame object). constant FLAG_PARENT_SCOPE = 0x00000100; //! If set, the array from do_enter(), do_return() and cached_return() //! will be interpreted in the scope of the parent tag, rather than in //! the current one. constant FLAG_NO_IMPLICIT_ARGS = 0x00000200; //! If set, the parser won't apply any implicit arguments. FIXME: Not //! yet implemented. constant FLAG_STREAM_RESULT = 0x00000400; //! If set, the do_return() function will be called repeatedly until //! it returns 0 or no more content is wanted. constant FLAG_STREAM_CONTENT = 0x00000800; //! If set, the tag supports getting its content in streaming mode: //! do_return() will be called repeatedly with successive parts of the //! content then. Can't be changed from do_return(). //! Note: It might be obvious, but using streaming is significantly //! less effective than nonstreaming, so it should only be done when //! big delays are expected. constant FLAG_STREAM = FLAG_STREAM_RESULT | FLAG_STREAM_CONTENT; constant FLAG_UNPARSED = 0x00001000; //! If set, args and content in the frame contain unparsed strings. //! The frame will be parsed before it's evaluated. This flag should //! never be set in Tag.flags, but it's useful when creating frames //! directly. //! The following flags specifies whether certain conditions must be //! met for a cached frame to be considered (if RXML.Frame.is_valid() //! is defined). They may be read directly after do_return() returns. //! The tag name is always the same. FIXME: These are ideas only; not //! yet implemented. constant FLAG_CACHE_DIFF_ARGS = 0x00010000; //! If set, the arguments to the tag need not be the same (using //! equal()) as the cached args. constant FLAG_CACHE_DIFF_CONTENT = 0x00020000; //! If set, the content need not be the same. constant FLAG_CACHE_DIFF_RESULT_TYPE = 0x00040000; //! If set, the result type need not be the same. (Typically //! not useful unless cached_return() is used.) constant FLAG_CACHE_DIFF_VARS = 0x00080000; //! If set, the variables with external scope in vars (i.e. normally //! those that has been accessed with get_var()) need not have the //! same values (using equal()) as the actual variables. constant FLAG_CACHE_SAME_STACK = 0x00100000; //! If set, the stack of call frames needs to be the same. constant FLAG_CACHE_EXECUTE_RESULT = 0x00200000; //! If set, an array to execute will be stored in the frame instead of //! the final result. On a cache hit it'll be executed like the return //! value from do_return() to produce the result. class Frame //! A tag instance. { constant is_RXML_Frame = 1; constant thrown_at_unwind = 1; //! Interface. Frame up; //! The parent frame. This frame is either created from the content //! inside the up frame, or it's in the array returned from //! do_return() in the up frame. Tag tag; //! The RXML.Tag object this frame was created from. int flags; //! Various bit flags that affect parsing. See the FLAG_* constants. mapping(string:mixed) args; //! The arguments passed to the tag. Set before //! do_enter()/do_return() are called. Type content_type; //! The type of the content. mixed content = Void; //! The content. Set before do_return() is called, but only when the //! tag is actually used with container syntax. Type result_type; //! The required result type. Set before do_enter()/do_return() are //! called. do_return() should produce a result of this type. mixed result = Void; //! The result. //!mapping(string:mixed) vars; //! Set this to introduce a new variable scope that will be active //! during parsing of the content and return values (but see also //! FLAG_PARENT_SCOPE). //!string scope_name; //! The scope name for the variables. Must be set before the scope //! is used for the first time, and can't be changed after that. //!TagSet additional_tags; //! If set, the tags in this tag set will be used in addition to the //! tags inherited from the surrounding parser. The additional tags //! will in turn be inherited by subparsers. //!TagSet local_tags; //! If set, the tags in this tag set will be used in the parser for //! the content, instead of the one inherited from the surrounding //! parser. The tags are not inherited by subparsers. //!array do_enter (RequestID id); //!array do_return (RequestID id, void|mixed piece); //! do_enter() is called first thing when processing the tag. //! do_return() is called after the content (if any) is processed. //! //! For tags that loops more than one time (see do_iterate): //! do_enter() is only called initially before the first call to //! do_iterate(). do_return() is called after each iteration. //! //! The result_type variable is set to the type of result the parser //! wants. It's any type or subtype that is valid by //! tag->result_type. If the result type is sequential, it's spliced //! into the surrounding content, otherwise it replaces the previous //! value of the content, if any. If the result is Void, it does not //! affect the surrounding content at all. //! //! Return values: //! //! array - A so-called execution array to be handled by the //! parser. The elements are processed in order, and have //! the following usage: //! //! string - Added or put into the result. If the result type has //! a parser, the string will be parsed with it before //! it's assigned to the result variable and passed on. //! RXML.Frame - Already initialized frame to process. Neither //! arguments nor content will be parsed. It's result is //! added or put into the result of this tag. //! mapping(string:mixed) - Fields to merge into the headers. //! FIXME: Not yet implemented. FIXME: Somehow represent //! removal of headers? //! object - Treated as a file object to read in blocking or //! nonblocking mode. FIXME: Not yet implemented, details //! not decided. //! multiset(mixed) - Should only contain one element that'll be //! added or put into the result. Normally not necessary; //! assign it directly to the result variable instead. //! //! 0 - Do nothing special. Exits the tag when used from //! do_return() and FLAG_STREAM_RESULT is set. //! //! Note that the intended use is not to postparse by setting a //! parser on the result type, but instead to return an array with //! literal strings and RXML.Frame objects where parsing (or, more //! accurately, evaluation) needs to be done. //! //! If an array instead of a function is given, the array is handled //! as above. If do_return is zero, the value in the result variable //! is simply used. If the result variable is Void, content is used //! as result if it's of a compatible type. //! //! Regarding do_return only: //! //! Normally the content variable is set to the parsed content of //! the tag before do_return() is called. This may be Void if the //! content parsing didn't produce any result. //! //! If the result from parsing the content is not Void, it's //! assigned to or added to the content variable. Assignment is used //! if the content type is nonsequential, addition otherwise. Thus //! earlier values are simply overridden for nonsequential types. //! //! piece is used when the tag is operating in streaming mode (i.e. //! FLAG_STREAM_CONTENT is set). It's then set to each successive //! part of the content in the stream, and the content variable is //! never touched. do_return() is also called "normally" with no //! piece argument afterwards. Note that tags that support streaming //! mode might still be used nonstreaming (it might also vary //! between iterations). //! //! As long as FLAG_STREAM_RESULT is set, do_return() will be called //! repeatedly until it returns 0. It's only the result piece from //! the execution array that is propagated after each turn; the //! result variable only accumulates all these pieces. //!int do_iterate (RequestID id); //! Controls the number of passes in the tag done by the parser. In //! every pass, the content of the tag (if any) is processed, then //! do_return() is called. //! //! Before doing any pass, do_iterate() is called. If the return //! value is nonzero, that many passes is done, then do_iterate() is //! called again and the process repeats. If the return value is //! zero, the tag exits and the value in result is used in the //! surrounding content as described above. //! //! The most common way to iterate is to do the setup before every //! pass (e.g. setup the variable scope) and return 1 to do one pass //! through the content. This will repeat until 0 is returned. //! //! If do_iterate is a positive integer, that many passes is done //! and then the tag exits. If do_iterate is zero no pass is done. //! If do_iterate is missing, one pass is done. //!int|function(RequestID:int) is_valid; //! When defined, the frame may be cached. First the name of the tag //! must be the same. Then the conditions specified by the cache //! bits in flag are checked. Then, if this is a function, it's //! called. If it returns 1, the frame is reused. FIXME: Not yet //! implemented. optional array cached_return (Context ctx, void|mixed piece); //! If defined, this will be called to get the value from a cached //! frame (that's still valid) instead of using the cached result. //! It's otherwise handled like do_return(). Note that the cached //! frame may be used from several threads. FIXME: Not yet //! implemented. //! Services. void run_error (string msg, mixed... args) //! Throws an RXML run error with a dump of the parser stack in the //! current context. This is intended to be used by tags for errors //! that can occur during normal operation, such as when the //! connection to an SQL server fails. { _run_error (msg, @args); } void parse_error (string msg, mixed... args) //! Throws an RXML parse error with a dump of the parser stack in //! the current context. This is intended to be used for programming //! errors in the RXML code, such as lookups in nonexisting scopes //! and invalid arguments to a tag. { _parse_error (msg, @args); } void terminate() //! Makes the parser abort. The data parsed so far will be returned. //! Does not return; throws a special exception instead. { fatal_error ("FIXME\n"); } void suspend() //! Used together with resume() for nonblocking mode. May be called //! from do_enter() or do_return() to suspend the parser: The parser //! will just stop, leaving the context intact. If it returns, the //! parser is used in a place that doesn't support nonblocking, so //! just go ahead and block. { fatal_error ("FIXME\n"); } void resume() //! Makes the parser continue where it left off. The function that //! called suspend() will be called again. { fatal_error ("FIXME\n"); } mapping(string:Tag) get_plugins() //! Returns the plugins registered for this tag, which is assumed to //! be a socket tag, i.e. to have FLAG_SOCKET_TAG set (see //! Tag.plugin_name for details). Indices are the plugin_name values //! for the plugin Tag objects, values are the plugin objects //! themselves. Don't be destructive on the returned mapping. { #ifdef MODULE_DEBUG if (!(flags & FLAG_SOCKET_TAG)) fatal_error ("This tag is not a socket tag.\n"); #endif return get_context()->tag_set->get_plugins (tag->name); } // Internals. mixed _exec_array (TagSetParser parser, array exec, int parent_scope) { Frame this = this_object(); Context ctx = parser->context; int i = 0; mixed res = Void; Parser subparser = 0; mixed err = catch { if (parent_scope) LEAVE_SCOPE (ctx, this); for (; i < sizeof (exec); i++) { mixed elem = exec[i], piece = Void; switch (sprintf ("%t", elem)) { case "string": if (result_type->_parser_prog == PNone) piece = elem; else { subparser = result_type->get_parser (ctx, 0, parser); subparser->finish ([string] elem); // Might unwind. piece = subparser->eval(); // Might unwind. subparser = 0; } break; case "mapping": fatal_error ("Header mappings not yet implemented.\n"); break; case "multiset": if (sizeof ([multiset] elem) == 1) piece = ((array) elem)[0]; else if (sizeof ([multiset] elem) > 1) fatal_error (sizeof ([multiset] elem) + " values in multiset in exec array.\n"); else fatal_error ("No value in multiset in exec array.\n"); break; default: if (objectp (elem)) // Can't count on that sprintf ("%t", ...) on an object // returns "object". if (([object] elem)->is_RXML_Frame) { ([object(Frame)] elem)->_eval (parser); // Might unwind. piece = ([object(Frame)] elem)->result; } else if (([object] elem)->is_RXML_Parser) { // The subparser above unwound. ([object(Parser)] elem)->finish(); // Might unwind. piece = ([object(Parser)] elem)->eval(); // Might unwind. } else fatal_error ("File objects not yet implemented.\n"); else fatal_error ("Invalid type %t in exec array.\n", elem); } if (result_type->sequential) res += piece; else if (piece != Void) result = res = piece; } if (result_type->sequential) result += res; if (parent_scope) ENTER_SCOPE (ctx, this); return res; }; if (parent_scope) ENTER_SCOPE (ctx, this); if (result_type->sequential) result += res; if (objectp (err) && ([object] err)->thrown_at_unwind) { mapping(string:mixed)|mapping(object:array) ustate; if ((ustate = ctx->unwind_state) && !zero_type (ustate->stream_piece)) // Subframe wants to stream. Update stream_piece and send it on. if (result_type->quoting_scheme != parser->type->quoting_scheme) res = parser->type->quote (res); if (result_type->sequential) ustate->stream_piece = res + ustate->stream_piece; else if (ustate->stream_piece == Void) ustate->stream_piece = res; ustate->exec_left = exec[i..]; // Left to execute. if (subparser) // Replace the string with the subparser object so that we'll // continue in it later. It's done here to keep the original // exec array untouched. ([array] ustate->exec_left)[0] = subparser; throw (err); } throw_fatal (err); } private void _handle_runtime_tags (Context ctx, TagSetParser parser) { // FIXME: PCode handling. multiset(string|Tag) rem_tags = ctx->new_runtime_tags->remove_tags; multiset(Tag) add_tags = ctx->new_runtime_tags->add_tags - rem_tags; if (sizeof (rem_tags)) foreach (indices (add_tags), Tag tag) if (rem_tags[tag->name]) add_tags[tag] = 0; array(string|Tag) arr_rem_tags = (array) rem_tags; array(Tag) arr_add_tags = (array) add_tags; for (Parser p = parser; p; p = p->_parent) if (p->tag_set_eval && !p->_local_tag_set && p->add_runtime_tag) { foreach (arr_add_tags, Tag tag) ([object(TagSetParser)] p)->add_runtime_tag (tag); foreach (arr_rem_tags, string|object(Tag) tag) ([object(TagSetParser)] p)->remove_runtime_tag (tag); } ctx->runtime_tags |= add_tags; ctx->runtime_tags -= rem_tags; ctx->new_runtime_tags = 0; } void _eval (TagSetParser parser, void|mapping(string:string) raw_args, void|string raw_content) // Note: It might be somewhat tricky to override this function. { Frame this = this_object(); Context ctx = parser->context; // Unwind state data: //raw_content #define EVSTAT_BEGIN 0 #define EVSTAT_ENTERED 1 #define EVSTAT_LAST_ITER 2 #define EVSTAT_ITER_DONE 3 int eval_state = EVSTAT_BEGIN; int iter; Parser subparser; mixed piece; array exec; int tags_added; // Flag that we added additional_tags to ctx->tag_set. //ctx->new_runtime_tags #define PRE_INIT_ERROR(X) (ctx->frame = this, fatal_error (X)) #ifdef DEBUG // Internal sanity checks. if (ctx != get_context()) PRE_INIT_ERROR ("Internal error: Context not current.\n"); if (!parser->tag_set_eval) PRE_INIT_ERROR ("Internal error: Calling _eval() with non-tag set parser.\n"); #endif #ifdef MODULE_DEBUG if (ctx->new_runtime_tags) PRE_INIT_ERROR ("Looks like Context.add_runtime_tag() or " "Context.remove_runtime_tag() was used outside any parser.\n"); #endif if (flags & FLAG_UNPARSED) { #ifdef DEBUG if (raw_args || raw_content) PRE_INIT_ERROR ("Internal error: raw_args or raw_content given for " "unparsed frame.\n"); #endif raw_args = args, args = 0; raw_content = content, content = Void; #ifdef MODULE_DEBUG if (!stringp (raw_content)) PRE_INIT_ERROR ("Content is not a string in unparsed tag frame.\n"); #endif } if (array state = ctx->unwind_state && ctx->unwind_state[this]) { #ifdef DEBUG if (!up) PRE_INIT_ERROR ("Internal error: Resuming frame without up pointer.\n"); if (raw_args || raw_content) PRE_INIT_ERROR ("Internal error: Can't feed new arguments or content " "when resuming parse.\n"); #endif object ignored; [ignored, eval_state, iter, raw_content, subparser, piece, exec, tags_added, ctx->new_runtime_tags] = state; m_delete (ctx->unwind_state, this); if (!sizeof (ctx->unwind_state)) ctx->unwind_state = 0; } else { #ifdef MODULE_DEBUG if (up && up != ctx->frame) PRE_INIT_ERROR ("Reuse of frame in different context.\n"); #endif up = ctx->frame; piece = Void; } #undef PRE_INIT_ERROR ctx->frame = this; if (raw_args) { args = raw_args; if (sizeof (raw_args)) { // Note: Code duplication in Tag.eval_args(). mapping(string:Type) atypes = raw_args & tag->req_arg_types; if (sizeof (atypes) < sizeof (tag->req_arg_types)) { array(string) missing = sort (indices (tag->req_arg_types - atypes)); parse_error ("Required " + (sizeof (missing) > 1 ? "arguments " + String.implode_nicely (missing) + " are" : "argument " + missing[0] + " is") + " missing.\n"); } atypes += raw_args & tag->opt_arg_types; #ifdef MODULE_DEBUG if (mixed err = catch { #endif foreach (indices (args), string arg) args[arg] = (atypes[arg] || tag->def_arg_type)-> eval (raw_args[arg], ctx, 0, parser, 1); // 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 } } #ifdef MODULE_DEBUG if (!args) fatal_error ("args not set.\n"); #endif if (TagSet add_tags = raw_content && [object(TagSet)] this->additional_tags) { if (!ctx->tag_set_is_local) ctx->make_tag_set_local(); if (search (ctx->tag_set->imported, add_tags) < 0) { ctx->tag_set->imported = ({add_tags}) + ctx->tag_set->imported; tags_added = 1; } } if (!result_type) { #ifdef MODULE_DEBUG if (!tag) fatal_error ("result_type not set in Frame object %O, " "and it has no Tag object to use for inferring it.\n", this_object()); #endif Type ptype = parser->type; foreach (tag->result_types, Type rtype) if (ptype == rtype) { result_type = rtype; break; } else if (ptype->subtype_of (rtype)) { result_type = ptype (rtype->_parser_prog); break; } if (!result_type) // Sigh.. parse_error ( "Tag returns " + String.implode_nicely ([array(string)] tag->result_types->name, "or") + " but " + [string] parser->type->name + " is expected.\n"); } if (!content_type) { #ifdef MODULE_DEBUG if (!tag) fatal_error ("content_type not set in Frame object %O, " "and it has no Tag object to use for inferring it.\n", this_object()); #endif content_type = tag->content_type; if (content_type == t_same) content_type = result_type (content_type->_parser_prog); } mixed err = catch { switch (eval_state) { case EVSTAT_BEGIN: if (array|function(RequestID,void|mixed:array) do_enter = [array|function(RequestID,void|mixed:array)] this->do_enter) { if (!exec) { exec = do_enter (ctx->id); // Might unwind. if (ctx->new_runtime_tags) _handle_runtime_tags (ctx, parser); } if (exec) { if (!(flags & FLAG_PARENT_SCOPE)) ENTER_SCOPE (ctx, this); mixed res = _exec_array (parser, exec, 0); // Might unwind. if (flags & FLAG_STREAM_RESULT) { #ifdef DEBUG if (ctx->unwind_state) fatal_error ("Internal error: Clobbering unwind_state " "to do streaming.\n"); if (piece != Void) fatal_error ("Internal error: Thanks, we think about how nice it must " "be to play the harmonica...\n"); #endif if (result_type->quoting_scheme != parser->type->quoting_scheme) res = parser->type->quote (res); ctx->unwind_state = (["stream_piece": res]); throw (this); } exec = 0; } } eval_state = EVSTAT_ENTERED; /* Fall through. */ case EVSTAT_ENTERED: case EVSTAT_LAST_ITER: do { if (eval_state != EVSTAT_LAST_ITER) { int|function(RequestID:int) do_iterate = [int|function(RequestID:int)] this->do_iterate; if (intp (do_iterate)) { iter = [int] do_iterate || 1; eval_state = EVSTAT_LAST_ITER; } else { iter = (/*[function(RequestID:int)]HMM*/ do_iterate) ( ctx->id); // Might unwind. if (ctx->new_runtime_tags) _handle_runtime_tags (ctx, parser); if (!iter) eval_state = EVSTAT_LAST_ITER; } } ENTER_SCOPE (ctx, this); for (; iter > 0; iter--) { if (raw_content && raw_content != "") { // Got nested parsing to do. int finished = 0; if (!subparser) { // The nested content is not yet parsed. if (this->local_tags) { subparser = content_type->get_parser ( ctx, [object(TagSet)] this->local_tags, parser); subparser->_local_tag_set = 1; } else subparser = content_type->get_parser (ctx, 0, parser); subparser->finish (raw_content); // Might unwind. finished = 1; } do { if (flags & FLAG_STREAM_CONTENT && subparser->read) { // Handle a stream piece. // Squeeze out any free text from the subparser first. mixed res = subparser->read(); if (content_type->sequential) piece = res + piece; else if (piece == Void) piece = res; if (piece != Void) { array|function(RequestID,void|mixed:array) do_return; if ((do_return = [array|function(RequestID,void|mixed:array)] this->do_return) && !arrayp (do_return)) { if (!exec) { exec = do_return (ctx->id, piece); // Might unwind. if (ctx->new_runtime_tags) _handle_runtime_tags (ctx, parser); } if (exec) { ENTER_SCOPE (ctx, this); mixed res = _exec_array ( parser, exec, flags & FLAG_PARENT_SCOPE); // Might unwind. if (flags & FLAG_STREAM_RESULT) { #ifdef DEBUG if (!zero_type (ctx->unwind_state->stream_piece)) fatal_error ("Internal error: " "Clobbering unwind_state->stream_piece.\n"); #endif if (result_type->quoting_scheme != parser->type->quoting_scheme) res = parser->type->quote (res); ctx->unwind_state->stream_piece = res; throw (this); } exec = 0; } else if (flags & FLAG_STREAM_RESULT) { // do_return() finished the stream. Ignore remaining content. ctx->unwind_state = 0; piece = Void; break; } } piece = Void; } if (finished) break; } else { // The frame doesn't handle streamed content. piece = Void; if (finished) { mixed res = subparser->eval(); // Might unwind. if (content_type->sequential) content += res; else if (res != Void) content = res; break; } } subparser->finish(); // Might unwind. finished = 1; } while (1); // Only loops when an unwound subparser has been recovered. subparser = 0; } if (array|function(RequestID,void|mixed:array) do_return = [array|function(RequestID,void|mixed:array)] this->do_return) { if (!exec) { exec = arrayp (do_return) ? [array] do_return : ([function(RequestID,void|mixed:array)] do_return) ( ctx->id); // Might unwind. if (ctx->new_runtime_tags) _handle_runtime_tags (ctx, parser); } if (exec) { ENTER_SCOPE (ctx, this); mixed res = _exec_array ( parser, exec, flags & FLAG_PARENT_SCOPE); // Might unwind. if (flags & FLAG_STREAM_RESULT) { #ifdef DEBUG if (ctx->unwind_state) fatal_error ("Internal error: Clobbering unwind_state " "to do streaming.\n"); if (piece != Void) fatal_error ("Internal error: Thanks, we think about how nice " "it must be to play the harmonica...\n"); #endif if (result_type->quoting_scheme != parser->type->quoting_scheme) res = parser->type->quote (res); ctx->unwind_state = (["stream_piece": res]); throw (this); } exec = 0; } } } } while (eval_state != EVSTAT_LAST_ITER); /* Fall through. */ case EVSTAT_ITER_DONE: if (!this->do_return && result == Void) if (result_type->_parser_prog == PNone) { if (content_type->subtype_of (result_type)) result = content; } else if (stringp (content_type)) { eval_state = EVSTAT_ITER_DONE; // Only need to record this state here. if (!exec) exec = ({content}); _exec_array (parser, exec, flags & FLAG_PARENT_SCOPE); // Might unwind. exec = 0; } LEAVE_SCOPE (ctx, this); } if (ctx->new_runtime_tags) _handle_runtime_tags (ctx, parser); }; if (err) { LEAVE_SCOPE (ctx, this); string action; if (objectp (err) && ([object] err)->thrown_at_unwind) { mapping(string:mixed)|mapping(object:array) ustate = ctx->unwind_state; if (!ustate) ustate = ctx->unwind_state = ([]); #ifdef DEBUG if (ustate[this]) fatal_error ("Internal error: Frame already has an unwind state.\n"); #endif if (ustate->exec_left) { exec = [array] ustate->exec_left; m_delete (ustate, "exec_left"); } if (err == this || exec && sizeof (exec) && err == exec[0]) // This frame or a frame in the exec array wants to stream. if (parser->unwind_safe) { // Rethrow to continue in parent since we've already done // the appropriate do_return stuff in this frame in either // case. if (err == this) err = 0; if (tags_added) { ctx->tag_set->imported -= ({/*[object(TagSet)]HMM*/ this->additional_tags}); tags_added = 0; } action = "break"; } else { // Can't stream since the parser isn't unwind safe. Just // continue. m_delete (ustate, "stream_piece"); action = "continue"; } else if (!zero_type (ustate->stream_piece)) { // Got a stream piece from a subframe. We handle it above; // store the state and tail recurse. piece = ustate->stream_piece; m_delete (ustate, "stream_piece"); action = "continue"; } else action = "break"; // Some other reason - back up to the top. ustate[this] = ({err, eval_state, iter, raw_content, subparser, piece, exec, tags_added, ctx->new_runtime_tags}); } else { ctx->handle_exception (err, parser); // Will rethrow unknown errors. action = "return"; } switch (action) { case "break": // Throw and handle in parent frame. #ifdef MODULE_DEBUG if (!parser->unwind_state) fatal_error ("Trying to unwind inside a parser that isn't unwind safe.\n"); #endif throw (this); case "continue": // Continue in this frame through tail recursion. _eval (parser); return; case "return": // A normal return. break; default: fatal_error ("Internal error: Don't you come here and %O on me!\n", action); } } if (tags_added) ctx->tag_set->imported -= ({/*[object(TagSet)]HMM*/ this->additional_tags}); ctx->frame = up; } DECLARE_CNT (__count); string _sprintf() { return "RXML.Frame(" + (tag && [string] tag->name) + COMMA_CNT (__count) + ")"; } } // Global services. void run_error (string msg, mixed... args) //! Throws an RXML run error with a dump of the parser stack in the //! current context. This is intended to be used by tags for errors //! that can occur during normal operation, such as when the //! connection to an SQL server fails. { if (sizeof (args)) msg = sprintf (msg, @args); throw (Backtrace ("run", msg, get_context())); } void parse_error (string msg, mixed... args) //! Throws an RXML parse error with a dump of the parser stack in the //! current context. This is intended to be used for programming //! errors in the RXML code, such as lookups in nonexisting scopes and //! invalid arguments to a tag. { if (sizeof (args)) msg = sprintf (msg, @args); throw (Backtrace ("parse", msg, get_context())); } void fatal_error (string msg, mixed... args) //! Throws a Pike error that isn't catched and handled anywhere. It's //! just like the common error() function, but includes the RXML frame //! backtrace. { if (sizeof (args)) msg = sprintf (msg, @args); array bt = backtrace(); throw_fatal (({msg, bt[..sizeof (bt) - 2]})); } void throw_fatal (mixed err) //! Mainly used internally to throw an error that includes the RXML //! frame backtrace. { if (arrayp (err) && sizeof (err) == 2 || objectp (err) && !err->is_RXML_Backtrace && err->is_generic_error) { string msg; if (catch (msg = err[0])) throw (err); if (stringp (msg) && !has_value (msg, "\nRXML frame backtrace:\n")) { string descr = Backtrace ("fatal", 0)->describe_rxml_backtrace (1); if (sizeof (descr)) { if (sizeof (msg) && msg[-1] != '\n') msg += "\n"; msg += "RXML frame backtrace:\n" + descr; catch (err[0] = msg); } } } throw (err); } Frame make_tag (string name, mapping(string:mixed) args, void|mixed content) //! Returns a frame for the specified tag. The tag definition is //! looked up in the current context and tag set. args and content are //! not parsed or evaluated. { TagSet tag_set = get_context()->tag_set; object(Tag)|array(LOW_TAG_TYPE|LOW_CONTAINER_TYPE) tag = tag_set->get_tag (name); if (arrayp (tag)) fatal_error ("Getting frames for low level tags are currently not implemented.\n"); return tag (args, content); } Frame make_unparsed_tag (string name, mapping(string:string) args, void|string content) //! Returns a frame for the specified tag. The tag definition is //! looked up in the current context and tag set. args and content are //! given unparsed in this variant; they're parsed when the frame is //! about to be evaluated. { TagSet tag_set = get_context()->tag_set; object(Tag)|array(LOW_TAG_TYPE|LOW_CONTAINER_TYPE) tag = tag_set->get_tag (name); if (arrayp (tag)) fatal_error ("Getting frames for low level tags are currently not implemented.\n"); Frame frame = tag (args, content); frame->flags |= FLAG_UNPARSED; return frame; } class parse_frame /* (Type type, string to_parse) */ //! Returns a frame that, when evaluated, parses the given string //! according to the type (which typically has a parser set). { inherit Frame; constant flags = FLAG_UNPARSED; mapping(string:mixed) args = ([]); void create (Type type, string to_parse) { content_type = type, result_type = type (PNone); content = to_parse; } string _sprintf() {return sprintf ("parse_frame(%O)", content_type);} } //! Parsers. class Parser //! Interface class for a syntax parser that scans, parses and //! evaluates an input stream. Access to a parser object is assumed to //! be done in a thread safe way except where noted. { constant is_RXML_Parser = 1; constant thrown_at_unwind = 1; //! Services. int error_count; //! Number of RXML errors that occurred during evaluation. If this //! is nonzero, the value from eval() shouldn't be trusted. function(Parser:void) data_callback; //! A function to be called when data is likely to be available from //! eval(). It's always called when the source stream closes. //! write() and write_end() are the functions to use from outside //! the parser system, not feed() or finish(). int write (string in) //! Writes some source data to the parser. Returns nonzero if there //! might be data available in eval(). { int res; ENTER_CONTEXT (context); mixed err = catch { if (context && context->unwind_state && context->unwind_state->top) { #ifdef MODULE_DEBUG if (context->unwind_state->top != this_object()) fatal_error ("The context got an unwound state from another parser. " "Can't rewind.\n"); #endif m_delete (context->unwind_state, "top"); if (!sizeof (context->unwind_state)) context->unwind_state = 0; } if (feed (in)) res = 1; // Might unwind. if (res && data_callback) data_callback (this_object()); }; LEAVE_CONTEXT(); if (err) if (objectp (err) && ([object] err)->thrown_at_unwind) { #ifdef DEBUG if (err != this_object()) fatal_error ("Internal error: Unexpected unwind object catched.\n"); #endif if (!context->unwind_state) context->unwind_state = ([]); context->unwind_state->top = err; } else if (context) context->handle_exception (err, this_object()); // Will rethrow unknown errors. else throw_fatal (err); return res; } void write_end (void|string in) //! Closes the source data stream, optionally with a last bit of //! data. { int res; ENTER_CONTEXT (context); mixed err = catch { if (context && context->unwind_state && context->unwind_state->top) { #ifdef MODULE_DEBUG if (context->unwind_state->top != this_object()) fatal_error ("The context got an unwound state from another parser. " "Can't rewind.\n"); #endif m_delete (context->unwind_state, "top"); if (!sizeof (context->unwind_state)) context->unwind_state = 0; } finish (in); // Might unwind. if (data_callback) data_callback (this_object()); }; LEAVE_CONTEXT(); if (err) if (objectp (err) && ([object] err)->thrown_at_unwind) { #ifdef DEBUG if (err != this_object()) fatal_error ("Internal error: Unexpected unwind object catched.\n"); #endif if (!context->unwind_state) context->unwind_state = ([]); context->unwind_state->top = err; } else if (context) context->handle_exception (err, this_object()); // Will rethrow unknown errors. else throw_fatal (err); } array handle_var (string varref) // Parses and evaluates a possible variable reference, with the // appropriate error handling. { // We're always evaluating here, so context is always set. array(string) split = varref / "."; if (sizeof (split) == 2) if (mixed err = catch { sscanf (split[1], "%[^:]:%s", split[1], string encoding); context->current_var = varref; mixed val; if (zero_type (val = context->get_var ( // May throw. split[1], split[0], encoding ? t_text : type))) { context->current_var = 0; return ({}); } context->current_var = 0; return encoding ? ({roxen->roxen_encode (val, encoding)}) : ({val}); }) { context->current_var = 0; context->handle_exception (err, this_object()); // May throw. return ({}); } return type->free_text ? 0 : ({}); } //! Interface. Context context; //! The context to do evaluation in. It's assumed to never be //! modified asynchronously during the time the parser is working on //! an input stream. Type type; //! The expected result type of the current stream. (The parser //! should not do any type checking on this.) int compile; //! Must be set to nonzero before a stream is fed which should be //! compiled to p-code. //!mixed unwind_safe; //! If nonzero, the parser supports unwinding with throw()/catch(). //! Whenever an exception is thrown from some evaluation function, //! it should be able to call that function again with identical //! arguments the next time it continues. mixed feed (string in); //! Feeds some source data to the parse stream. The parser may do //! scanning and parsing before returning. If context is set, it may //! also do evaluation in that context. Returns nonzero if there //! could be new data to get from eval(). void finish (void|string in); //! Like feed(), but also finishes the parse stream. A last bit of //! data may be given. It should work to call this on an already //! finished stream if no argument is given to it. optional int report_error (string msg); //! Used to report errors to the end user through the output. This //! is only called when type->free_text is nonzero. msg should be //! stored in the output queue to be returned by eval(). If the //! context is bad for an error message, do nothing and return zero, //! and return nonzero if a message was written. optional mixed read(); //! Define to allow streaming operation. Returns the evaluated //! result so far, but does not do any evaluation. Returns Void if //! there's no data (for sequential types the empty value is also //! ok). mixed eval(); //! Evaluates the data fed so far and returns the result. The result //! returned by previous eval() calls should not be returned again //! as (part of) this return value. Returns Void if there's no data //! (for sequential types the empty value is also ok). optional PCode p_compile(); //! Define this to return a p-code representation of the current //! stream, which always is finished. optional void reset (Context ctx, Type type, mixed... args); //! Define to support reuse of a parser object. It'll be called //! instead of making a new object for a new stream. It keeps the //! static configuration, i.e. the type (and tag set when used in //! TagSetParser). Note that this function needs to deal with //! leftovers from add_runtime_tag() for TagSetParser objects. optional Parser clone (Context ctx, Type type, mixed... args); //! Define to create new parser objects by cloning instead of //! creating from scratch. It returns a new instance of this parser //! with the same static configuration, i.e. the type (and tag set //! when used in TagSetParser). static void create (Context ctx, Type _type, mixed... args) { context = ctx; type = _type; } // Internals. Parser _next_free; // Used to link together unused parser objects for reuse. Parser _parent; // The parent parser if this one is nested. Stdio.File _source_file; mapping _defines; // These two are compatibility kludges for use with parse_rxml(). DECLARE_CNT (__count); string _sprintf() {return "RXML.Parser" + PAREN_CNT (__count);} } class TagSetParser //! Interface class for parsers that evaluates using the tag set. It //! provides the evaluation and compilation functionality. The parser //! should call Tag._handle_tag() from feed() and finish() for every //! encountered tag, and Parser.handle_var() for encountered variable //! references. It must be able to continue cleanly after throw() from //! Tag._handle_tag(). { inherit Parser; constant tag_set_eval = 1; // Services. mixed eval() {return read();} // Interface. TagSet tag_set; //! The tag set used for parsing. optional void reset (Context ctx, Type type, TagSet tag_set, mixed... args); optional Parser clone (Context ctx, Type type, TagSet tag_set, mixed... args); static void create (Context ctx, Type type, TagSet _tag_set, mixed... args) { ::create (ctx, type); tag_set = _tag_set; } //! In addition to the type, the tag set is part of the static //! configuration. mixed read(); //! No longer optional in this class. Since the evaluation is done //! in Tag._handle_tag() or similar, this always does the same as //! eval(). optional void add_runtime_tag (Tag tag); //! Adds a tag that will exist from this point forward in the //! current parser instance only. This may only be left undefined if //! the parser doesn't parse tags at all. optional void remove_runtime_tag (string|Tag tag); //! Removes a tag added by add_runtime_tag(). This may only be left //! undefined if the parser doesn't parse tags at all. // Internals. int _local_tag_set; string _sprintf() {return "RXML.TagSetParser" + PAREN_CNT (__count);} } class PNone //! The identity parser. It only returns its input. { inherit Parser; string data = ""; int evalpos = 0; int feed (string in) { data += in; return 1; } void finish (void|string in) { if (in) data += in; } string eval() { string res = data[evalpos..]; evalpos = sizeof (data); return res; } string byte_compile() { return data; } string byte_interpret (string byte_code, Context ctx) { return byte_code; } void reset (Context ctx) { context = ctx; data = ""; evalpos = 0; } string _sprintf() {return "RXML.PNone" + PAREN_CNT (__count);} } mixed simple_parse (string in, void|program parser) //! A convenience function to parse a string with no type info, no tag //! set, and no variable references. The parser defaults to PExpr. { // FIXME: Recycle contexts? return t_any (parser || PExpr)->eval (in, Context (empty_tag_set)); } //! Types. class Type //! A static type definition. It does type checking and specifies some //! properties of the type. It may also contain a Parser program that //! will be used to read text and evaluate values of this type. Note //! that the parser is not relevant for type checking. { constant is_RXML_Type = 1; //! Interface. //!string name; //! Unique type identifier. Required and considered constant. Type //! hierarchies are currently implemented with glob patterns, e.g. //! "image/png" is a subtype of "image/*", and "array(string)" is a //! subtype of "array(*)". //!mixed sequential; //! Nonzero if data of this type is sequential, defined as: //! o One or more data items can be concatenated with `+. //! o (Sane) parsers are homomorphic on the type, i.e. //! eval ("da") + eval ("ta") == eval ("da" + "ta") //! and //! eval ("data") + eval ("") == eval ("data") //! provided the data is only split between (sensibly defined) //! atomic elements. //!mixed empty_value; //! The empty value for sequential data types, i.e. what eval ("") //! would produce. //!mixed free_text; //! Nonzero if the type keeps the free text between parsed tokens, //! e.g. the plain text between tags in XML. The type must be //! sequential and use strings. void type_check (mixed val); //! Checks whether the given value is a valid one of this type. Type //! errors are thrown with RXML.parse_error(). //!string quoting_scheme; //! An identifier for the quoting scheme this type uses, if any. The //! quoting scheme specifies how literals needs to be quoted for the //! type. Values converted between types with the same quoting //! scheme are not quoted. mixed quote (mixed val) //! Quotes the given value according to the quoting scheme for this //! type. { return val; } mixed convert (mixed val, void|Type from); //! Converts the given value to this type. If the from type is //! given, it's the type of the value. Since it's not always known, //! this function should try to do something sensible based on the //! primitive pike type. If the type can't be reasonably converted, //! an RXML fatal should be thrown. //! //! Quoting should be done if the from type is missing or has a //! different quoting scheme. Type clone() //! Returns a copy of the type. { Type newtype = object_program (this_object())(); newtype->_parser_prog = _parser_prog; newtype->_parser_args = _parser_args; newtype->_t_obj_cache = _t_obj_cache; return newtype; } //! Services. int `== (mixed other) //! { return objectp (other) && ([object] other)->is_RXML_Type && ([object(Type)] other)->name == this_object()->name; } int subtype_of (Type other) //! { return glob ([string] other->name, [string] this_object()->name); } Type `() (program/*(Parser)HMM*/ newparser, mixed... parser_args) //! Returns a type identical to this one, but which has the given //! parser. parser_args is passed as extra arguments to the //! create()/reset()/clone() functions. { Type newtype; if (sizeof (parser_args)) { // Can't cache this. newtype = clone(); newtype->_parser_prog = newparser; newtype->_parser_args = parser_args; if (newparser->tag_set_eval) newtype->_p_cache = ([]); } else { if (!_t_obj_cache) _t_obj_cache = ([]); if (!(newtype = _t_obj_cache[newparser])) if (newparser == _parser_prog) _t_obj_cache[newparser] = newtype = this_object(); else { _t_obj_cache[newparser] = newtype = clone(); newtype->_parser_prog = newparser; if (newparser->tag_set_eval) newtype->_p_cache = ([]); } } return newtype; } inline Parser get_parser (Context ctx, void|TagSet tag_set, void|Parser|PCode parent) //! Returns a parser instance initialized with the given context. { Parser p; if (_p_cache) { // It's a tag set parser. TagSet tset = tag_set || ctx->tag_set; if (parent && parent->is_RXML_Parser && tset == ctx->tag_set && sizeof (ctx->runtime_tags) && parent->clone && parent->type == this_object()) { // There are runtime tags. Try to clone the parent parser if // all conditions are met. p = parent->clone (ctx, this_object(), tset, @_parser_args); p->_parent = parent; return p; } // vvv Using interpreter lock from here. PCacheObj pco = _p_cache[tset]; if (pco && pco->tag_set_gen == tset->generation) { if ((p = pco->free_parser)) { pco->free_parser = p->_next_free; // ^^^ Using interpreter lock to here. p->data_callback = p->compile = 0; p->reset (ctx, this_object(), tset, @_parser_args); } else // ^^^ Using interpreter lock to here. if (pco->clone_parser) p = pco->clone_parser->clone (ctx, this_object(), tset, @_parser_args); else if ((p = _parser_prog (0, this_object(), tset, @_parser_args))->clone) // pco->clone_parser might already be initialized here due // to race, but that doesn't matter. p = (pco->clone_parser = p)->clone (ctx, this_object(), tset, @_parser_args); } else { // ^^^ Using interpreter lock to here. pco = PCacheObj(); pco->tag_set_gen = tset->generation; _p_cache[tset] = pco; // Might replace an object due to race, but that's ok. if ((p = _parser_prog (0, this_object(), tset, @_parser_args))->clone) // pco->clone_parser might already be initialized here due // to race, but that doesn't matter. p = (pco->clone_parser = p)->clone (ctx, this_object(), tset, @_parser_args); } if (ctx->tag_set == tset && p->add_runtime_tag && sizeof (ctx->runtime_tags)) foreach (indices (ctx->runtime_tags), Tag tag) p->add_runtime_tag (tag); } else { if ((p = free_parser)) { // Relying on interpreter lock here. free_parser = p->_next_free; p->data_callback = p->compile = 0; p->reset (ctx, this_object(), @_parser_args); } else if (clone_parser) // Relying on interpreter lock here. p = clone_parser->clone (ctx, this_object(), @_parser_args); else if ((p = _parser_prog (0, this_object(), @_parser_args))->clone) // clone_parser might already be initialized here due to race, // but that doesn't matter. p = (clone_parser = p)->clone (ctx, this_object(), @_parser_args); } p->_parent = parent; return p; } mixed eval (string in, void|Context ctx, void|TagSet tag_set, void|Parser|PCode parent, void|int dont_switch_ctx) //! Convenience function to parse and evaluate the value in the //! given string. If a context isn't given, the current one is used. //! The current context and ctx are assumed to be the same if //! dont_switch_ctx is nonzero. { mixed res; if (!ctx) ctx = get_context(); if (_parser_prog == PNone) res = in; else { Parser p = get_parser (ctx, tag_set, parent); p->_parent = parent; if (dont_switch_ctx) p->finish (in); // Optimize the job in p->write_end(). else p->write_end (in); res = p->eval(); if (p->reset) if (_p_cache) { // Relying on interpreter lock in this block. PCacheObj pco = _p_cache[tag_set || ctx->tag_set]; p->_next_free = pco->free_parser; pco->free_parser = p; } else { // Relying on interpreter lock in this block. p->_next_free = free_parser; free_parser = p; } } if (ctx->type_check) type_check (res); return res; } // Internals. program/*(Parser)HMM*/ _parser_prog = PNone; // The parser to use. Should never be changed in a type object. /*private*/ array(mixed) _parser_args = ({}); /*private*/ mapping(program:Type) _t_obj_cache; // To avoid creating new type objects all the time in `(). // Cache used for parsers that doesn't depend on the tag set. private Parser clone_parser; // Used with Parser.clone(). private Parser free_parser; // The list of objects to reuse with Parser.reset(). // Cache used for parsers that depend on the tag set. private class PCacheObj { int tag_set_gen; Parser clone_parser; Parser free_parser; } /*private*/ mapping(TagSet:PCacheObj) _p_cache; DECLARE_CNT (__count); string _sprintf() {return "RXML.Type" + PAREN_CNT (__count);} } static class TAny //! A completely unspecified nonsequential type. { inherit Type; constant name = "*"; constant quoting_scheme = "none"; mixed convert (mixed val) {return val;} string _sprintf() {return "RXML.t_any" + PAREN_CNT (__count);} } TAny t_any = TAny(); static class TNone //! A sequential type accepting only the empty value. { inherit Type; constant name = "none"; constant sequential = 1; VoidType empty_value = Void; constant quoting_scheme = "none"; void type_check (mixed val) { if (val != Void) parse_error ("A value is not accepted.\n"); } mixed convert (mixed val) { type_check (val); return Void; } string _sprintf() {return "RXML.t_none" + PAREN_CNT (__count);} } TNone t_none = TNone(); static class TSame //! A magic type used in Tag.content_type. { inherit Type; constant name = "same"; string _sprintf() {return "RXML.t_same" + PAREN_CNT (__count);} } TSame t_same = TSame(); static class TText //! The standard type for generic document text. { inherit Type; constant name = "text/*"; constant sequential = 1; constant empty_value = ""; constant free_text = 1; constant quoting_scheme = "none"; string convert (mixed val) { if (mixed err = catch {return (string) val;}) parse_error ("Couldn't convert value to text: " + describe_error (err)); } string _sprintf() {return "RXML.t_text" + PAREN_CNT (__count);} } TText t_text = TText(); static class TXml //! The type for XML and similar markup. { inherit TText; constant name = "text/xml"; constant quoting_scheme = "xml"; string quote (string val) { return replace ( val, // FIXME: This ignores the invalid Unicode character blocks. ({"&", "<", ">", "\"", "\'", "\000", "\001", "\002", "\003", "\004", "\005", "\006", "\007", "\010", "\013", "\014", "\016", "\017", "\020", "\021", "\022", "\023", "\024", "\025", "\026", "\027", "\030", "\031", "\032", "\033", "\034", "\035", "\036", "\037", }), ({"&", "<", ">", """, /*"'"*/ "'", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", })); } string convert (mixed val, void|Type from) { if (mixed err = catch {val = (string) val;}) parse_error ("Couldn't convert value to text: " + describe_error (err)); if (!from || from->quoting_scheme != quoting_scheme) val = quote ([string] val); return val; } string _sprintf() {return "RXML.t_xml" + PAREN_CNT (__count);} } THtml t_xml = TXml(); static class THtml //! Identical to t_xml, but tags it as "text/html". { inherit TXml; constant name = "text/html"; string _sprintf() {return "RXML.t_html" + PAREN_CNT (__count);} } THtml t_html = THtml(); // P-code compilation and evaluation. class VarRef //! A helper for representing variable reference tokens. { constant is_RXML_VarRef = 1; string scope, var; static void create (string _scope, string _var) {scope = _scope, var = _var;} int valid (Context ctx) {return ctx->exist_scope (scope);} mixed get (Context ctx) {return ctx->get_var (var, scope);} mixed set (Context ctx, mixed val) {return ctx->set_var (var, val, scope);} void delete (Context ctx) {ctx->delete_var (var, scope);} string name() {return scope + "." + var;} DECLARE_CNT (__count); string _sprintf() {return "RXML.VarRef(" + scope + "." + var + COMMA_CNT (__count) + ")";} } class PCode //! Holds p-code and evaluates it. P-code is the intermediate form //! after parsing and before evaluation. { constant is_RXML_PCode = 1; constant thrown_at_unwind = 1; array p_code = ({}); int error_count; //! Number of RXML errors that occurred during evaluation. If this //! is nonzero, the value from eval() shouldn't be trusted. mixed eval (Context ctx) //! Evaluates the p-code in the given context. { // FIXME } function(Context:mixed) compile(); //! Returns a compiled function for doing the evaluation. The //! function will receive a context to do the evaluation in. // Internals. void report_error (string msg) { // FIXME } PCode|Parser _parent; // The parent evaluator if this one is nested. DECLARE_CNT (__count); string _sprintf() {return "RXML.PCode" + PAREN_CNT (__count);} } //! Some parser tools. static class VoidType { mixed `+ (mixed... vals) {return sizeof (vals) ? predef::`+ (@vals) : this_object();} mixed ``+ (mixed val) {return val;} int `!() {return 1;} string _sprintf() {return "RXML.Void";} }; VoidType Void = VoidType(); //! An object representing the void value. Works as initializer for //! sequences, since Void + anything == anything + Void == anything. class ScanStream //! A helper class for the input and scanner stage in a parser. It's a //! stream that takes unparsed strings and splits them into tokens //! which are queued. Intended to be inherited in a Parser class. { private class Link { array data; Link next; } private Link head = Link(); // Last link is an empty eof marker. private Link tail = head; private int next_token = 0; private string end = ""; private int fin = 0; array scan (string in, int finished); //! The scanner function. It gets an unparsed string and should //! return an array of tokens. If the second argument is nonzero, //! there won't be any more data later. If the second argument is //! zero, the last item in the returned array is handled as unparsed //! data that will be passed back to the scanner later. Tokens may //! be of any type. Use VarRef objects for variables. void feed (string in) //! { #ifdef MODULE_DEBUG if (fin) fatal_error ("Cannot feed data to a finished stream.\n"); #endif array tokens = scan (end + in, 0); end = [string] tokens[-1]; if (sizeof (tokens) > 1) { tail->data = tokens[..sizeof (tokens) - 2]; tail = tail->next = Link(); } } void finish (void|string in) //! { if (in || !fin && sizeof (end)) { #ifdef MODULE_DEBUG if (in && fin) fatal_error ("Cannot feed data to a finished stream.\n"); #endif fin = 1; if (in) end += in; tail->data = scan (end, 1); tail = tail->next = Link(); } } void reset() //! { head = Link(); tail = head; next_token = 0; end = ""; fin = 0; } mixed read() //! Returns the next token, or Void if there's no more data. { while (head->next) if (next_token >= sizeof (head->data)) { next_token = 0; head = head->next; } else return head->data[next_token++]; return Void; } void unread (mixed... put_back) //! Puts back tokens and variable references at the beginning of the //! stream so that the leftmost argument will be read first. { int i = sizeof (put_back); while (i) head->data[--next_token] = put_back[--i]; if (i) { Link l = Link(); l->next = head, head = l; l->data = allocate (next_token = max (i - 32, 0)) + put_back[..--i]; } } array read_all() //! { array data; if (next_token) { data = head->data[next_token..]; head = head->next; next_token = 0; } else data = ({}); while (head->next) { data += head->data; head = head->next; } return data; } int finished() //! Returns nonzero if the write end is finished. { return fin; } DECLARE_CNT (__count); string _sprintf() {return "RXML.ScanStream" + PAREN_CNT (__count);} } // Various internal kludges. static function(string,mixed...:void) _run_error = run_error; static function(string,mixed...:void) _parse_error = parse_error; // Argh! static program PXml; static program PEnt; static program PExpr; void _fix_module_ref (string name, mixed val) { mixed err = catch { switch (name) { case "PXml": PXml = [program] val; break; case "PEnt": PEnt = [program] val; break; case "PExpr": PExpr = [program] val; break; case "empty_tag_set": empty_tag_set = [object(TagSet)] val; break; default: error ("Herk\n"); } }; if (err) werror (describe_backtrace (err)); }

Roxen.git/ server/ etc/ modules/ RXML.pmod/ module.pmod > 11f192e510855da3c5afb8a602db7d388303da08 [Annotate]