Annotation of parser3/src/types/pa_value.h, revision 1.133
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:
1.133 ! misha 11: static const char * const IDENT_VALUE_H="$Date: 2009-07-07 05:48:24 $";
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:
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; }
1.124 paf 62:
63: /// is this value void?
64: virtual bool is_void() const { return false; }
65:
1.128 misha 66: /// is this value bool?
67: virtual bool is_bool() const { return false; }
68:
1.124 paf 69: /// is this value number?
1.126 paf 70: virtual bool is_evaluated_expr() const { return false; }
1.124 paf 71:
1.106 paf 72: /// what's the meaning of this value in context of expression?
1.110 paf 73: virtual Value& as_expr_result(bool /*return_string_as_is*/=false) {
1.112 paf 74: return *bark("is '%s', can not be used in expression");
1.34 paf 75: }
1.59 parser 76:
1.110 paf 77:
78:
79: /** extract HashStringValue if any
80: WARNING: FOR LOCAL USE ONLY, THIS POINTER IS NOT TO PASS TO ANYBODY!
81: */
82: virtual HashStringValue* get_hash() { return 0; }
1.59 parser 83:
1.106 paf 84: /// extract const String
1.110 paf 85: virtual const String* get_string() { return 0; }
1.59 parser 86:
1.106 paf 87: /// extract double
1.110 paf 88: virtual double as_double() const { bark("is '%s', it does not have numerical (double) value"); return 0; }
1.59 parser 89:
1.106 paf 90: /// extract integer
1.110 paf 91: virtual int as_int () const { bark("is '%s', it does not have numerical (int) value"); return 0; }
1.59 parser 92:
1.106 paf 93: /// extract bool
1.110 paf 94: virtual bool as_bool() const { bark("is '%s', it does not have logical value"); return 0; }
1.59 parser 95:
1.106 paf 96: /// extract file
1.132 misha 97: virtual VFile* as_vfile(String::Language lang, const Request_charsets* charsets=0);
1.59 parser 98:
1.106 paf 99: /// extract Junction
1.110 paf 100: virtual Junction* get_junction();
1.59 parser 101:
1.120 paf 102: /// extract Property
103: virtual Property* get_property() { return 0; }
104:
1.93 paf 105: /** extract base object of Value
106: @return for
107: - VObject: fbase
108: */
1.110 paf 109: virtual Value* base_object();
1.93 paf 110:
1.120 paf 111: /// @return Value element; can return Junction for methods; Code-Junction for code; Getter-Junction for property
1.110 paf 112: virtual Value* get_element(const String& /*aname*/, Value& /*aself*/, bool /*looking_up*/);
1.92 paf 113:
1.122 paf 114: /// indicator value meaning that put_element overwritten something
1.123 paf 115: #define PUT_ELEMENT_REPLACED_ELEMENT reinterpret_cast<const VJunction*>(1)
1.106 paf 116: /// store Value element under @a name
1.122 paf 117: /// @returns putter method junction, or it can just report[PUT_ELEMENT_REPLACED_ELEMENT]
118: /// that it replaced something in base fields
1.123 paf 119: virtual const VJunction* put_element(Value& /*aself*/, const String& aname, Value* /*avalue*/, bool /*areplace*/) {
1.65 parser 120: // to prevent modification of system classes,
121: // created at system startup, and not having exception
122: // handler installed, we neet to bark using request.pool
1.112 paf 123: bark("element can not be stored to %s", &aname);
1.120 paf 124: return 0;
1.65 parser 125: }
1.59 parser 126:
1.106 paf 127: /// extract VStateless_class
1.85 paf 128: virtual VStateless_class *get_class()=0;
1.107 paf 129:
130: /// extract VStateless_class
131: virtual VStateless_class *get_last_derived_class() {
132: return get_class();
133: };
1.108 paf 134: /// extract base object or class of Value, if any
1.110 paf 135: virtual Value* base() { return 0; }
1.32 paf 136:
1.106 paf 137: /// extract VTable
1.110 paf 138: virtual Table* get_table() { return 0; }
1.1 paf 139:
140: public: // usage
141:
1.26 paf 142: /// @return sure String. if it doesn't have string value barks
1.1 paf 143: const String& as_string() {
1.110 paf 144: const String* result=get_string();
1.1 paf 145: if(!result)
1.110 paf 146: bark("is '%s', it has no string representation");
1.6 paf 147:
1.1 paf 148: return *result;
149: }
150:
1.6 paf 151: protected:
1.1 paf 152:
1.22 paf 153: /// throws exception specifying bark-reason and name() type() of problematic value
1.112 paf 154: Value* bark(const char *reason, const String *problem_source=0) const {
1.127 paf 155: //if(this) // removing warnings on unreachable code
1.129 misha 156: throw Exception(PARSER_RUNTIME,
1.117 paf 157: problem_source,
158: reason, type());
159:
1.127 paf 160: //return 0;
1.1 paf 161: }
162:
1.17 paf 163: };
1.110 paf 164:
1.48 paf 165:
166: /**
1.110 paf 167: $content-type[text/html] ->
168: content-type: text/html
1.130 misha 169: $content-type[$.value[text/html] $.charset[windows-1251]] ->
1.110 paf 170: content-type: text/html; charset=windows-1251
1.48 paf 171: */
1.110 paf 172: const String& attributed_meaning_to_string(Value& meaning,
173: String::Language lang,
1.128 misha 174: bool forced=false,
175: bool allow_bool=false);
1.110 paf 176:
177: // defines
178:
179: ///@{common field names
180: #define CHARSET_NAME "charset"
181: #define VALUE_NAME "value"
1.114 paf 182: #define EXPIRES_NAME "expires"
1.110 paf 183: #define CONTENT_TYPE_NAME "content-type"
1.119 paf 184: #define NAME_NAME "name"
1.110 paf 185: //@}
186:
187: ///@{common field names
188: extern const String value_name;
1.114 paf 189: extern const String expires_name;
1.110 paf 190: extern const String content_type_name;
191: extern const String name_name;
192: ///@}
1.1 paf 193:
194: #endif
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