Roxen.git/server/etc/modules/RXML.pmod/module.pmod:3e593414a71bfada9dfcf5cb12f159f2d92cab9a

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2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 //! RXML parser and compiler framework. //! //! Created 1999-07-30 by Martin Stjernholm. //! //! $Id: module.pmod,v 1.22 2000/01/18 10:33:33 mast Exp $ //! Kludge: Must use "RXML.refs" somewhere for the whole module to be //! loaded correctly. //! WARNING: This API is not yet set in stone; expect incompatible //! changes. #pragma strict_types 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; //! Define to declare 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 content_type = t_text (PHtml); //! The handled type of the content, if the tag is used as a //! container. It's taken from the actual result type if set to //! zero. //! //! This default says it's text, but the HTML parser is used to read //! it, which means that the content is preparsed with HTML syntax. //! Use t_text directly with no parser to get the raw text. array(Type) result_types = ({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). string scope_name; //! RXML.Frame.scope_name is initialized from this. TagSet additional_tags, local_tags; //! RXML.Frame.additional_tags and RXML.Frame.local_tags are //! initialized from these. function(:Frame) frame(); //! This function should return an object to be used as a frame. The //! frame object must (in practice) inherit RXML.Frame. //! Services. inline Frame `() (mapping(string:mixed) args, void|mixed|PCode 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 not parsed; see //! RXML.Frame.do_return() for details. Note: Never reuse the same //! frame object. { Tag this = this_object(); Frame frame = ([function(:Frame)] this->frame)(); frame->tag = this; frame->flags = flags; if (scope_name) frame->scope_name = scope_name; if (additional_tags) frame->additional_tags = additional_tags; if (local_tags) frame->local_tags = local_tags; frame->args = args; if (!zero_type (content)) frame->content = content; return frame; } // 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. Frame frame; if (mapping(string:mixed)|mapping(object:array) ustate = ctx->unwind_state) if (ustate[parser]) frame = [object(Frame)] ustate[parser][0]; else frame = `() (args, Void); else frame = `() (args, Void); mixed err = catch { frame->_eval (parser, args, content); return frame->result == Void ? ({}) : ({frame->result}); }; 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) error ("Internal error: Unexpected unwind object catched.\n"); if (ustate[parser]) error ("Internal error: Clobbering unwind state for parser.\n"); #endif ustate[parser] = ({err}); err = parser; } throw (err); } string _sprintf() { return "RXML.Tag(" + [string] this_object()->name + ")"; } } 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 prefix that may precede the tags. If zero, it's up to the //! importing tag set(s). int prefix_required; //! 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) tags = mkmapping ([array(string)] _tags->name, _tags); } void add_tag (Tag tag) //! { tags[tag->name] = tag; changed(); } void add_tags (array(Tag) _tags) //! { tags += mkmapping (/*[array(string)]HMM*/ _tags->name, _tags); 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) 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_all_tags (name) * ({}); else return imported->get_all_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()); } mixed `->= (string var, mixed val) { switch (var) { case "imported": (imported - ({0}))->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}); prepare_funs (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; (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()); } private mapping(string:Tag) tags = ([]); // Private since we want to track changes in this. private array(function(:void)) notify_funcs = ({}); // Weak (when nonempty). private array(function(Context:void)) prepare_funs; /*private*/ 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; } string _sprintf() { return name ? "RXML.TagSet(" + name + ")" : "RXML.TagSet"; } } 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); } class Scope //! Interface for objects that emulates a scope mapping. { mixed `[] (string var, void|Context ctx, void|string scope_name) {rxml_error ("Cannot query variable" + _in_the_scope (scope_name) + ".\n");} mixed `[]= (string var, mixed val, void|Context ctx, void|string scope_name) {rxml_error ("Cannot set variable" + _in_the_scope (scope_name) + ".\n");} array(string) _indices (void|Context ctx, void|string scope_name) {rxml_error ("Cannot list variables" + _in_the_scope (scope_name) + ".\n");} void m_delete (string var, void|Context ctx, void|string scope_name) {rxml_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 ""; } } #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. mixed get_var (string var, void|string scope_name) //! 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 (SCOPE_TYPE vars = scopes[scope_name || "_"]) { mixed val; if (objectp (vars)) { val = ([object(Scope)] vars)->`[] (var, this_object(), scope_name || "_"); if (val == Void) return ([])[0]; } else if (zero_type (val = vars[var])) return ([])[0]; else if (objectp (val) && ([object] val)->rxml_var_eval) return ([object(Value)] val)-> rxml_var_eval (this_object(), var, scope_name || "_"); else return val; } else if (scope_name) rxml_error ("Unknown scope %O.\n", scope_name); else rxml_error ("No current scope.\n"); } 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) rxml_error ("Unknown scope %O.\n", scope_name); else rxml_error ("No current scope.\n"); } 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) rxml_error ("Unknown scope %O.\n", scope_name); else rxml_error ("No current scope.\n"); } 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) rxml_error ("Unknown scope %O.\n", scope_name); else rxml_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 an object. It must implement the methods `[], //! _indices(), and m_delete(). { if (scopes[scope_name]) if (scope_name == "_") { SCOPE_TYPE inner = scopes["_"]; while (SCOPE_TYPE outer = hidden[inner]) inner = outer; hidden[inner] = vars; } else { Frame outermost; for (Frame f = frame; f; f = f->up) if (f->scope_name == scope_name) outermost = f; if (outermost) hidden[outermost] = vars; else scopes[scope_name] = vars; } else scopes[scope_name] = vars; } void remove_scope (string scope_name) //! Removes the named scope from the global level, if it exists. { #ifdef MODULE_DEBUG if (scope_name == "_") 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. It will have effect in the current parser //! and parent parsers up to the point where tag_set changes. { if (!new_runtime_tags) new_runtime_tags = RuntimeTags(); 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(). It will have effect in //! the current parser and parent parsers up to the point where //! tag_set changes. { if (!new_runtime_tags) new_runtime_tags = RuntimeTags(); new_runtime_tags->remove_tags[tag] = 1; } void rxml_error (string msg, mixed... args) //! Throws an RXML error with a dump of the parser stack. { if (sizeof (args)) msg = sprintf (msg, @args); msg = rxml_errmsg_prefix + ": " + msg; if (current_var) msg += " | &" + current_var + ";\n"; for (Frame f = frame; f; f = f->up) { if (f->tag) msg += " | <" + f->tag->name; else if (!f->up) break; else msg += " | <(unknown tag)"; if (f->args) foreach (sort (indices (f->args)), string arg) { mixed val = f->args[arg]; msg += " " + arg + "="; if (arrayp (val)) msg += map (val, error_print_val) * ","; else msg += error_print_val (val); } else msg += " (no argmap)"; msg += ">\n"; } array b = backtrace(); throw (({msg, b[..sizeof (b) - 2]})); } 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++; string msg = describe_error (err); if (msg[..sizeof (rxml_errmsg_prefix) - 1] == rxml_errmsg_prefix) { // An RXML error. while (evaluator->_parent) { evaluator->error_count++; evaluator = evaluator->_parent; } if (id && id->conf) msg = ([function(mixed,Type:string)] ([object] id->conf)->handle_rxml_error) (err, evaluator->type); else { #ifdef MODULE_DEBUG report_notice (describe_backtrace (err)); #else report_notice (msg); #endif } if (evaluator->type->free_text && evaluator->report_error) evaluator->report_error (msg); } else throw (err); } // Internals. constant rxml_errmsg_prefix = "RXML parser error"; 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 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) 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(SCOPE_TYPE|Frame:SCOPE_TYPE) hidden = ([]); // The currently hidden variable mappings in scopes. The old "_" // entries are indexed by the replacing variable mapping. The old // named scope entries are indexed by the frame object which // replaced them. void enter_scope (Frame frame) { SCOPE_TYPE vars; #ifdef DEBUG if (!frame->vars) error ("Internal error: Frame has no variables.\n"); #endif if ((vars = [SCOPE_TYPE] frame->vars) != scopes["_"]) { hidden[vars] = scopes["_"]; scopes["_"] = vars; if (string scope_name = [string] frame->scope_name) { hidden[frame] = scopes[scope_name]; scopes[scope_name] = vars; } } } void leave_scope (Frame frame) { if (string scope_name = [string] frame->scope_name) if (hidden[frame]) { scopes[scope_name] = hidden[frame]; m_delete (hidden, frame); } SCOPE_TYPE vars; if (hidden[vars = [SCOPE_TYPE] frame->vars]) { scopes["_"] = hidden[vars]; m_delete (hidden, vars); } } #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; } } class RuntimeTags { multiset(Tag) add_tags = (<>); multiset(Tag|string) remove_tags = (<>); } RuntimeTags 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().) string _sprintf() {return "RXML.Context";} #ifdef MODULE_DEBUG int in_use; #endif } //! 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 #ifdef MODULE_DEBUG // 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 && __old_ctx != ctx) \ error ("Attempt to use context asynchronously.\n"); \ ctx->in_use = 1; \ } #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 void rxml_error (string msg, mixed... args) //! Tries to throw an error with rxml_error() in the current context. { Context ctx = get_context(); if (ctx && ctx->rxml_error) ctx->rxml_error (msg, @args); else { if (sizeof (args)) msg = sprintf (msg, @args); msg = Context.rxml_errmsg_prefix + " (no context): " + msg; array b = backtrace(); throw (({msg, b[..sizeof (b) - 2]})); } } //! Constants for the bit field RXML.Frame.flags. //! Static flags (i.e. tested in the Tag object). constant FLAG_CONTAINER = 0x00000001; //! If set, the tag accepts non-empty content. E.g. with the standard //! HTML parser this defines whether the tag is a container or not. constant FLAG_NO_PREFIX = 0x00000002; //! Never apply any prefix to this tag. //! 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_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; //! 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). Don't replace or remove the mapping later. //!string scope_name; //! The scope name for the variables. Don't change this later. //!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. optional int|function(RequestID:int|function) do_enter (RequestID id); //! Called before the content (if any) is processed. This function //! typically only initializes vars. Return values: //! //! int - Do this many passes through the content. do_return() //! will be called after each pass. //! function(RequestID:int|function) - A function that is handled //! just like do_enter(), only repeatedly until it returns //! 0 or another function. //! //! If this function is missing, one pass is done. //!array do_return (RequestID id, void|mixed piece); //! Called after the content (if any) has been processed. //! //! The result_type variable is set to the type of result the parser //! wants. It's any type 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. //! //! Return values: //! //! array - A so-called execution array to be handled by the parser: //! //! 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. Ends the stream when //! FLAG_STREAM_RESULT is set. //! //! Note that the intended use is not to postparse by returning //! strings, but instead to return an array with literal strings and //! RXML.Frame objects where parsing (or, more accurately, //! evaluation) needs to be done. //! //! 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. //! //! If this function is an array, it's executed as above. If it's //! 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. //!int|function(: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 rxml_error (string msg, mixed... args) //! Throws an RXML error from the current context. { get_context()/*HMM*/->rxml_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. { 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. { error ("FIXME\n"); } void resume() //! Makes the parser continue where it left off. The function that //! called suspend() will be called again. { error ("FIXME\n"); } // Internals. mixed _exec_array (TagSetParser parser, array exec) { Frame this = this_object(); Context ctx = parser->context; int i = 0; mixed res = Void; Parser subparser = 0; mixed err = catch { if (flags & FLAG_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); subparser->_parent = parser; subparser->finish ([string] elem); // Might unwind. piece = subparser->eval(); // Might unwind. subparser = 0; } break; case "object": if (([object] elem)->is_RXML_Frame) { ([object(Frame)] elem)->_eval (0); // 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 error ("File objects not yet implemented.\n"); break; case "mapping": 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) error (sizeof ([multiset] elem) + " values in multiset in exec array.\n"); else error ("No value in multiset in exec array.\n"); break; default: 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 (flags & FLAG_PARENT_SCOPE) ENTER_SCOPE (ctx, this); return res; }; 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->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); } private void _handle_runtime_tags (TagSetParser parser, Context.RuntimeTags runtime_tags) { // FIXME: PCode handling. multiset(string|Tag) rem_tags = runtime_tags->remove_tags; multiset(Tag) add_tags = 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) { 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); } } 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 int|function(RequestID:int|function) fn, 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, 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 (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, fn, 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; mapping(string:Type) atypes; if (tag->req_arg_types) { 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)); rxml_error ("Required " + (sizeof (missing) > 1 ? "arguments " + String.implode_nicely (missing) + " are" : "argument " + missing[0] + " is") + " missing.\n"); } } if (tag->opt_arg_types) if (atypes) atypes += raw_args & tag->opt_arg_types; else atypes = raw_args & tag->opt_arg_types; if (atypes) if (mixed err = catch { foreach (indices (atypes), string arg) args[arg] = atypes[arg]->eval ( raw_args[arg], ctx, 0, parser, 1); // Should currently NOT unwind. }) { if (objectp (err) && ([object] err)->thrown_at_unwind) error ("Can't save parser state when evaluating arguments.\n"); throw (err); } } #ifdef DEBUG if (!args) error ("Internal 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) { Type ptype = parser->type; foreach (tag->result_types, Type rtype) if (ptype->subtype_of (rtype)) {result_type = rtype; break;} if (!result_type) // Sigh.. rxml_error ( "Tag returns " + String.implode_nicely ([array(string)] tag->result_types->name, "or") + " but " + [string] parser->type->name + " is expected.\n"); } if (!content_type) content_type = tag->content_type || result_type; mixed err = catch { if (!fn) fn = this->do_enter ? this->do_enter (ctx->id) : 1; // Might unwind. do { if (!iter) { iter = fn, fn = 0; while (functionp (iter)) { // Got a function from do_enter. int|function(RequestID:int|function) newiter = [int|function(RequestID:int|function)] iter (ctx->id); // Might unwind. fn = iter, iter = newiter; } } ENTER_SCOPE (ctx, this); for (; iter > 0; iter--) { if (raw_content) { // Got nested parsing to do. if (ctx->new_runtime_tags) { // Empty this first in case do_enter() set it. _handle_runtime_tags (parser, ctx->new_runtime_tags); ctx->new_runtime_tags = 0; } int finished = 0; if (!subparser) { // The nested content is not yet parsed. subparser = content_type->get_parser ( ctx, [object(TagSet)] this->local_tags); subparser->_parent = 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) { int|array|function(RequestID,void|mixed:array) do_return; if ((do_return = [int|array|function(RequestID,void|mixed:array)] this->do_return) && functionp (do_return)) { if (!exec) exec = do_return (ctx->id, piece); // Might unwind. if (exec) { mixed res = _exec_array (parser, exec); // Might unwind. if (flags & FLAG_STREAM_RESULT) { #ifdef DEBUG if (!zero_type (ctx->unwind_state->stream_piece)) error ("Internal error: " "Clobbering unwind_state->stream_piece.\n"); #endif 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 (int|array|function(RequestID,void|mixed:array) do_return = [int|array|function(RequestID,void|mixed:array)] this->do_return) { if (!exec) exec = functionp (do_return) ? ([function(RequestID,void|mixed:array)] do_return) ( ctx->id) : // Might unwind. [array] do_return; if (exec) { mixed res = _exec_array (parser, exec); // Might unwind. if (flags & FLAG_STREAM_RESULT) { #ifdef DEBUG if (ctx->unwind_state) error ("Internal error: Clobbering unwind_state to do streaming.\n"); if (piece != Void) error ("Internal error: Thanks, we think about how nice it must " "be to play the harmonica...\n"); #endif ctx->unwind_state = (["stream_piece": res]); throw (this); } } } else if (result == Void && content_type->subtype_of (result_type)) result = content; } } while (fn); if (ctx->new_runtime_tags) { _handle_runtime_tags (parser, ctx->new_runtime_tags); ctx->new_runtime_tags = 0; } }; LEAVE_SCOPE (ctx, this); if (err) { 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]) 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, fn, iter, raw_content, subparser, piece, exec, tags_added, ctx->new_runtime_tags}); } else { ctx->handle_exception (err, parser); // May throw. action = "return"; } switch (action) { case "break": // Throw and handle in parent frame. #ifdef MODULE_DEBUG if (!parser->unwind_state) 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: 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; } string _sprintf() { return "RXML.Frame(" + (tag && [string] tag->name) + ")"; } } //! 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()) 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 (this_object()/*HMM*/->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()) 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()); // May throw. else throw (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()) 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; } this_object()/*HMM*/->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()) 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()); // May throw. else throw (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 { context->current_var = varref; mixed val; if (zero_type (val = context->get_var (split[1], split[0]))) { // May throw. context->current_var = 0; return ({}); } context->current_var = 0; if (type->free_text) val = (string) val; return val == Void ? ({}) : ({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 void report_error (string msg); //! Used to report errors to the end user through the output. This //! is only called when the type allows free text. msg should be //! stored in the output queue to be returned by eval(). 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. 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. The instance //! this function is called in is never actually used for parsing. 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(). string _sprintf() {return "RXML.Parser";} } 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 this_object()/*HMM*/->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(); //! Not optional. Since the evaluation is done in Tag._handle_tag() //! or similar, this always does the same as eval(). void add_runtime_tag (Tag tag); //! Adds a tag that will exist from this point forward in the //! current parser instance only. void remove_runtime_tag (string|Tag tag); //! Removes a tag added by add_runtime_tag(). string _sprintf() {return "RXML.TagSetParser";} } 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";} } 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 HTML. 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.rxml_error(). 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) //! Returns a parser instance initialized with the given context. { Parser p; if (_p_cache) { // It's a tag set parser. TagSet tset; // vvv Using interpreter lock from here. PCacheObj pco = _p_cache[tset = tag_set || ctx->tag_set]; 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 (ctx, 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 (ctx, 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 { 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 (ctx, 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); } 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); 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; string _sprintf() {return "RXML.Type";} } static class TypeAny //! A completely unspecified nonsequential type. { inherit Type; constant name = "*"; string _sprintf() {return "RXML.t_any";} } TypeAny t_any = TypeAny(); static class TypeText //! The standard type for generic document text. { inherit Type; constant name = "text/*"; constant sequential = 1; constant empty_value = ""; constant free_text = 1; string _sprintf() {return "RXML.t_text";} } TypeText t_text = TypeText(); static class TypeHtml //! The standard type for generic document text. { inherit TypeText; constant name = "text/html"; string _sprintf() {return "RXML.t_html";} } TypeHtml t_html = TypeHtml(); // 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;} string _sprintf() {return "RXML.VarRef(" + scope + "." + var + ")";} } 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. string _sprintf() {return "RXML.PCode";} // Internals. void report_error (string msg) { // FIXME } PCode|Parser _parent; // The parent evaluator if this one is nested. } //! 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) 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) 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; } string _sprintf() {return "RXML.ScanStream";} } // Various internal stuff. // Argh! static program PHtml; static program PExpr; void _fix_module_ref (string name, mixed val) { mixed err = catch { switch (name) { case "PHtml": PHtml = [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 > 3e593414a71bfada9dfcf5cb12f159f2d92cab9a [Annotate]