Annotation of parser3/src/types/pa_value.h, revision 1.138
1.22 paf 1: /** @file
1.110 paf 2: Parser: Value, Method, Junction .
1.24 paf 3:
1.131 misha 4: Copyright (c) 2001-2009 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:
1.138 ! moko 11: static const char * const IDENT_VALUE_H="$Date: 2010-08-11 16:21:52 $";
1.1 paf 12:
1.133 misha 13: #include "pa_common.h"
1.1 paf 14: #include "pa_array.h"
15: #include "pa_exception.h"
1.120 paf 16: #include "pa_property.h"
1.1 paf 17:
1.99 paf 18: // forwards
19:
1.9 paf 20: class VStateless_class;
1.1 paf 21: class WContext;
1.133 misha 22: class Request;
23: class Request_charsets;
1.17 paf 24: class Junction;
1.123 paf 25: class VJunction;
1.17 paf 26: class Method;
1.131 misha 27: class Value;
1.64 parser 28: class MethodParams;
1.93 paf 29: class VObject;
1.99 paf 30: class VMethodFrame;
1.110 paf 31: class VFile;
32: class Table;
1.133 misha 33: typedef Array<Value*> ArrayValue;
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:
42: /**
1.95 paf 43: all except VObject/VClass: this if @atype eq type()
44: VObject/VClass: can locate parent class by it's type
1.89 paf 45: */
1.134 misha 46: virtual Value* as(const char* atype) {
1.96 paf 47: return atype && strcmp(type(), atype)==0?this:0;
1.89 paf 48: }
1.97 paf 49: /// type checking helper, uses Value::as
1.134 misha 50: bool is(const char* atype) { return as(atype)!=0; }
1.59 parser 51:
1.106 paf 52: /// is this value defined?
1.38 paf 53: virtual bool is_defined() const { return true; }
1.59 parser 54:
1.106 paf 55: /// is this value string?
1.38 paf 56: virtual bool is_string() const { return false; }
1.124 paf 57:
58: /// is this value void?
59: virtual bool is_void() const { return false; }
60:
1.128 misha 61: /// is this value bool?
62: virtual bool is_bool() const { return false; }
63:
1.124 paf 64: /// is this value number?
1.126 paf 65: virtual bool is_evaluated_expr() const { return false; }
1.124 paf 66:
1.106 paf 67: /// what's the meaning of this value in context of expression?
1.110 paf 68: virtual Value& as_expr_result(bool /*return_string_as_is*/=false) {
1.112 paf 69: return *bark("is '%s', can not be used in expression");
1.34 paf 70: }
1.59 parser 71:
1.110 paf 72:
73:
74: /** extract HashStringValue if any
75: WARNING: FOR LOCAL USE ONLY, THIS POINTER IS NOT TO PASS TO ANYBODY!
76: */
77: virtual HashStringValue* get_hash() { return 0; }
1.59 parser 78:
1.106 paf 79: /// extract const String
1.110 paf 80: virtual const String* get_string() { return 0; }
1.136 misha 81:
82: virtual HashStringValue* get_fields() { return 0; }
1.59 parser 83:
1.106 paf 84: /// extract double
1.110 paf 85: virtual double as_double() const { bark("is '%s', it does not have numerical (double) value"); return 0; }
1.59 parser 86:
1.106 paf 87: /// extract integer
1.110 paf 88: virtual int as_int () const { bark("is '%s', it does not have numerical (int) value"); return 0; }
1.59 parser 89:
1.106 paf 90: /// extract bool
1.110 paf 91: virtual bool as_bool() const { bark("is '%s', it does not have logical value"); return 0; }
1.59 parser 92:
1.106 paf 93: /// extract file
1.132 misha 94: virtual VFile* as_vfile(String::Language lang, const Request_charsets* charsets=0);
1.59 parser 95:
1.106 paf 96: /// extract Junction
1.110 paf 97: virtual Junction* get_junction();
1.59 parser 98:
1.120 paf 99: /// @return Value element; can return Junction for methods; Code-Junction for code; Getter-Junction for property
1.134 misha 100: virtual Value* get_element(const String& /*aname*/);
1.92 paf 101:
1.122 paf 102: /// indicator value meaning that put_element overwritten something
1.123 paf 103: #define PUT_ELEMENT_REPLACED_ELEMENT reinterpret_cast<const VJunction*>(1)
1.134 misha 104:
1.106 paf 105: /// store Value element under @a name
1.122 paf 106: /// @returns putter method junction, or it can just report[PUT_ELEMENT_REPLACED_ELEMENT]
107: /// that it replaced something in base fields
1.134 misha 108: virtual const VJunction* put_element(const String& aname, Value* /*avalue*/, bool /*areplace*/) {
1.65 parser 109: // to prevent modification of system classes,
110: // created at system startup, and not having exception
111: // handler installed, we neet to bark using request.pool
1.112 paf 112: bark("element can not be stored to %s", &aname);
1.120 paf 113: return 0;
1.65 parser 114: }
1.137 moko 115:
116: /// VObject default getter & setter support
117: virtual void enable_default_getter(){ }
118: virtual void enable_default_setter(){ }
119: virtual void disable_default_getter(){ }
120: virtual void disable_default_setter(){ }
121: virtual bool is_enabled_default_getter(){ return true; }
1.59 parser 122:
1.106 paf 123: /// extract VStateless_class
1.135 misha 124: virtual VStateless_class* get_class()=0;
1.107 paf 125:
1.135 misha 126: /// extract base class, if any
127: virtual VStateless_class* base() { return 0; }
1.32 paf 128:
1.106 paf 129: /// extract VTable
1.110 paf 130: virtual Table* get_table() { return 0; }
1.1 paf 131:
132: public: // usage
133:
1.26 paf 134: /// @return sure String. if it doesn't have string value barks
1.1 paf 135: const String& as_string() {
1.110 paf 136: const String* result=get_string();
1.1 paf 137: if(!result)
1.110 paf 138: bark("is '%s', it has no string representation");
1.6 paf 139:
1.1 paf 140: return *result;
141: }
142:
1.22 paf 143: /// throws exception specifying bark-reason and name() type() of problematic value
1.112 paf 144: Value* bark(const char *reason, const String *problem_source=0) const {
1.127 paf 145: //if(this) // removing warnings on unreachable code
1.129 misha 146: throw Exception(PARSER_RUNTIME,
1.117 paf 147: problem_source,
148: reason, type());
149:
1.127 paf 150: //return 0;
1.1 paf 151: }
152:
1.17 paf 153: };
1.110 paf 154:
1.48 paf 155:
156: /**
1.110 paf 157: $content-type[text/html] ->
158: content-type: text/html
1.130 misha 159: $content-type[$.value[text/html] $.charset[windows-1251]] ->
1.110 paf 160: content-type: text/html; charset=windows-1251
1.48 paf 161: */
1.110 paf 162: const String& attributed_meaning_to_string(Value& meaning,
163: String::Language lang,
1.128 misha 164: bool forced=false,
165: bool allow_bool=false);
1.110 paf 166:
167: // defines
168:
169: ///@{common field names
170: #define CHARSET_NAME "charset"
171: #define VALUE_NAME "value"
1.114 paf 172: #define EXPIRES_NAME "expires"
1.110 paf 173: #define CONTENT_TYPE_NAME "content-type"
1.119 paf 174: #define NAME_NAME "name"
1.110 paf 175: //@}
176:
177: ///@{common field names
178: extern const String value_name;
1.114 paf 179: extern const String expires_name;
1.110 paf 180: extern const String content_type_name;
181: extern const String name_name;
182: ///@}
1.1 paf 183:
184: #endif
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