Annotation of parser3/src/types/pa_value.h, revision 1.114
1.22 paf 1: /** @file
1.110 paf 2: Parser: Value, Method, Junction .
1.24 paf 3:
1.110 paf 4: Copyright (c) 2001-2003 ArtLebedev Group (http://www.artlebedev.com)
1.79 paf 5: Author: Alexandr Petrosian <paf@design.ru> (http://paf.design.ru)
1.1 paf 6: */
7:
8: #ifndef PA_VALUE_H
9: #define PA_VALUE_H
1.87 paf 10:
1.114 ! paf 11: static const char* IDENT_VALUE_H="$Date: 2003/09/25 09:15:03 $";
1.1 paf 12:
13: #include "pa_string.h"
14: #include "pa_array.h"
15: #include "pa_exception.h"
16:
1.99 paf 17: // forwards
18:
1.9 paf 19: class VStateless_class;
1.1 paf 20: class WContext;
1.110 paf 21: class Request; class Request_charsets;
1.17 paf 22: class Junction;
23: class Method;
1.110 paf 24: template<typename K, typename V> class Hash;
25: class Value;
1.113 paf 26: typedef Hash<const String::Body, Value*> HashStringValue;
27: typedef Hash<const String::Body, PA_Object*> HashStringObject;
1.110 paf 28: typedef Array<Value*> ArrayValue;
1.64 parser 29: class MethodParams;
1.93 paf 30: class VObject;
1.99 paf 31: class VMethodFrame;
1.110 paf 32: class VFile;
33: class Table;
1.1 paf 34:
1.31 paf 35: /// grandfather of all @a values in @b Parser
1.110 paf 36: class Value: public PA_Object {
1.1 paf 37: public: // Value
38:
1.106 paf 39: /// value type, used for error reporting and 'is' expression operator
1.110 paf 40: virtual const char* type() const =0;
1.89 paf 41:
1.91 paf 42: /** remember derived class instance
43: - VObject: the only client
44: */
1.110 paf 45: virtual VObject* set_derived(VObject* /*aderived*/);
1.91 paf 46:
1.89 paf 47: /**
1.95 paf 48: all except VObject/VClass: this if @atype eq type()
49: VObject/VClass: can locate parent class by it's type
1.89 paf 50: */
1.111 paf 51: virtual Value* as(const char* atype, bool /*looking_up*/) {
1.96 paf 52: return atype && strcmp(type(), atype)==0?this:0;
1.89 paf 53: }
1.97 paf 54: /// type checking helper, uses Value::as
1.110 paf 55: bool is(const char* atype) { return as(atype, false)!=0; }
1.59 parser 56:
1.106 paf 57: /// is this value defined?
1.38 paf 58: virtual bool is_defined() const { return true; }
1.59 parser 59:
1.106 paf 60: /// is this value string?
1.38 paf 61: virtual bool is_string() const { return false; }
1.59 parser 62:
1.106 paf 63: /// what's the meaning of this value in context of expression?
1.110 paf 64: virtual Value& as_expr_result(bool /*return_string_as_is*/=false) {
1.112 paf 65: return *bark("is '%s', can not be used in expression");
1.34 paf 66: }
1.59 parser 67:
1.110 paf 68:
69:
70: /** extract HashStringValue if any
71: WARNING: FOR LOCAL USE ONLY, THIS POINTER IS NOT TO PASS TO ANYBODY!
72: */
73: virtual HashStringValue* get_hash() { return 0; }
1.59 parser 74:
1.106 paf 75: /// extract const String
1.110 paf 76: virtual const String* get_string() { return 0; }
1.59 parser 77:
1.106 paf 78: /// extract double
1.110 paf 79: virtual double as_double() const { bark("is '%s', it does not have numerical (double) value"); return 0; }
1.59 parser 80:
1.106 paf 81: /// extract integer
1.110 paf 82: virtual int as_int () const { bark("is '%s', it does not have numerical (int) value"); return 0; }
1.59 parser 83:
1.106 paf 84: /// extract bool
1.110 paf 85: virtual bool as_bool() const { bark("is '%s', it does not have logical value"); return 0; }
1.59 parser 86:
1.106 paf 87: /// extract file
1.110 paf 88: virtual VFile* as_vfile(String::Language lang=String::L_UNSPECIFIED,
89: const Request_charsets* charsets=0);
1.59 parser 90:
1.106 paf 91: /// extract Junction
1.110 paf 92: virtual Junction* get_junction();
1.59 parser 93:
1.93 paf 94: /** extract base object of Value
95: @return for
96: - VObject: fbase
97: */
1.110 paf 98: virtual Value* base_object();
1.93 paf 99:
1.106 paf 100: /// extract Value element
1.110 paf 101: virtual Value* get_element(const String& /*aname*/, Value& /*aself*/, bool /*looking_up*/);
1.92 paf 102:
1.106 paf 103: /// store Value element under @a name
1.110 paf 104: virtual bool put_element(const String& aname, Value* /*avalue*/, bool /*areplace*/) {
1.65 parser 105: // to prevent modification of system classes,
106: // created at system startup, and not having exception
107: // handler installed, we neet to bark using request.pool
1.112 paf 108: bark("element can not be stored to %s", &aname);
1.93 paf 109: return false;
1.65 parser 110: }
1.59 parser 111:
1.106 paf 112: /// extract VStateless_class
1.85 paf 113: virtual VStateless_class *get_class()=0;
1.107 paf 114:
115: /// extract VStateless_class
116: virtual VStateless_class *get_last_derived_class() {
117: return get_class();
118: };
1.108 paf 119: /// extract base object or class of Value, if any
1.110 paf 120: virtual Value* base() { return 0; }
1.32 paf 121:
1.106 paf 122: /// extract VTable
1.110 paf 123: virtual Table* get_table() { return 0; }
1.1 paf 124:
125: public: // usage
126:
1.26 paf 127: /// @return sure String. if it doesn't have string value barks
1.1 paf 128: const String& as_string() {
1.110 paf 129: const String* result=get_string();
1.1 paf 130: if(!result)
1.110 paf 131: bark("is '%s', it has no string representation");
1.6 paf 132:
1.1 paf 133: return *result;
134: }
135:
1.6 paf 136: protected:
1.1 paf 137:
1.22 paf 138: /// throws exception specifying bark-reason and name() type() of problematic value
1.112 paf 139: Value* bark(const char *reason, const String *problem_source=0) const {
1.80 paf 140: throw Exception("parser.runtime",
1.112 paf 141: problem_source,
142: reason, type());
143: return 0; // useful for calming down compiler
1.1 paf 144: }
145:
1.17 paf 146: };
1.110 paf 147:
1.48 paf 148:
149: /**
1.110 paf 150: $content-type[text/html] ->
151: content-type: text/html
152: $content-type[$value[text/html] charset[windows-1251]] ->
153: content-type: text/html; charset=windows-1251
1.48 paf 154: */
1.110 paf 155: const String& attributed_meaning_to_string(Value& meaning,
156: String::Language lang,
157: bool forced=false);
158:
159: // defines
160:
161: ///@{common field names
162: #define CHARSET_NAME "charset"
163: #define VALUE_NAME "value"
1.114 ! paf 164: #define EXPIRES_NAME "expires"
1.110 paf 165: #define CONTENT_TYPE_NAME "content-type"
166: //@}
167:
168: ///@{common field names
169: extern const String value_name;
1.114 ! paf 170: extern const String expires_name;
1.110 paf 171: extern const String content_type_name;
172: extern const String name_name;
173: ///@}
1.1 paf 174:
175: #endif
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