Annotation of parser3/src/types/pa_value.h, revision 1.125
1.22 paf 1: /** @file
1.110 paf 2: Parser: Value, Method, Junction .
1.24 paf 3:
1.125 ! paf 4: Copyright (c) 2001-2005 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:
1.125 ! paf 11: static const char * const IDENT_VALUE_H="$Date: 2005/08/09 08:05:09 $";
1.1 paf 12:
13: #include "pa_string.h"
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;
1.110 paf 22: class Request; class Request_charsets;
1.17 paf 23: class Junction;
1.123 paf 24: class VJunction;
1.17 paf 25: class Method;
1.110 paf 26: template<typename K, typename V> class Hash;
27: class Value;
1.113 paf 28: typedef Hash<const String::Body, Value*> HashStringValue;
29: typedef Hash<const String::Body, PA_Object*> HashStringObject;
1.110 paf 30: typedef Array<Value*> ArrayValue;
1.64 parser 31: class MethodParams;
1.93 paf 32: class VObject;
1.99 paf 33: class VMethodFrame;
1.110 paf 34: class VFile;
35: class Table;
1.1 paf 36:
1.31 paf 37: /// grandfather of all @a values in @b Parser
1.110 paf 38: class Value: public PA_Object {
1.1 paf 39: public: // Value
40:
1.106 paf 41: /// value type, used for error reporting and 'is' expression operator
1.110 paf 42: virtual const char* type() const =0;
1.89 paf 43:
1.91 paf 44: /** remember derived class instance
45: - VObject: the only client
46: */
1.110 paf 47: virtual VObject* set_derived(VObject* /*aderived*/);
1.91 paf 48:
1.89 paf 49: /**
1.95 paf 50: all except VObject/VClass: this if @atype eq type()
51: VObject/VClass: can locate parent class by it's type
1.89 paf 52: */
1.111 paf 53: virtual Value* as(const char* atype, bool /*looking_up*/) {
1.96 paf 54: return atype && strcmp(type(), atype)==0?this:0;
1.89 paf 55: }
1.97 paf 56: /// type checking helper, uses Value::as
1.110 paf 57: bool is(const char* atype) { return as(atype, false)!=0; }
1.59 parser 58:
1.106 paf 59: /// is this value defined?
1.38 paf 60: virtual bool is_defined() const { return true; }
1.59 parser 61:
1.106 paf 62: /// is this value string?
1.38 paf 63: virtual bool is_string() const { return false; }
1.124 paf 64:
65: /// is this value void?
66: virtual bool is_void() const { return false; }
67:
68: /// is this value number?
69: virtual bool is_number() const { return false; }
70:
1.106 paf 71: /// what's the meaning of this value in context of expression?
1.110 paf 72: virtual Value& as_expr_result(bool /*return_string_as_is*/=false) {
1.112 paf 73: return *bark("is '%s', can not be used in expression");
1.34 paf 74: }
1.59 parser 75:
1.110 paf 76:
77:
78: /** extract HashStringValue if any
79: WARNING: FOR LOCAL USE ONLY, THIS POINTER IS NOT TO PASS TO ANYBODY!
80: */
81: virtual HashStringValue* get_hash() { return 0; }
1.59 parser 82:
1.106 paf 83: /// extract const String
1.110 paf 84: virtual const String* get_string() { return 0; }
1.59 parser 85:
1.106 paf 86: /// extract double
1.110 paf 87: virtual double as_double() const { bark("is '%s', it does not have numerical (double) value"); return 0; }
1.59 parser 88:
1.106 paf 89: /// extract integer
1.110 paf 90: virtual int as_int () const { bark("is '%s', it does not have numerical (int) value"); return 0; }
1.59 parser 91:
1.106 paf 92: /// extract bool
1.110 paf 93: virtual bool as_bool() const { bark("is '%s', it does not have logical value"); return 0; }
1.59 parser 94:
1.106 paf 95: /// extract file
1.110 paf 96: virtual VFile* as_vfile(String::Language lang=String::L_UNSPECIFIED,
97: 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 {
1.117 paf 155: if(this) // removing warnings on unreachable code
156: throw Exception("parser.runtime",
157: problem_source,
158: reason, type());
159:
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
169: $content-type[$value[text/html] charset[windows-1251]] ->
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,
174: bool forced=false);
175:
176: // defines
177:
178: ///@{common field names
179: #define CHARSET_NAME "charset"
180: #define VALUE_NAME "value"
1.114 paf 181: #define EXPIRES_NAME "expires"
1.110 paf 182: #define CONTENT_TYPE_NAME "content-type"
1.119 paf 183: #define NAME_NAME "name"
1.110 paf 184: //@}
185:
186: ///@{common field names
187: extern const String value_name;
1.114 paf 188: extern const String expires_name;
1.110 paf 189: extern const String content_type_name;
190: extern const String name_name;
191: ///@}
1.1 paf 192:
193: #endif
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