Annotation of parser3/src/types/pa_value.h, revision 1.111
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:
1.111 ! paf 11: static const char* IDENT_VALUE_H="$Date: 2003/07/24 11:31:25 $";
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;
26: typedef Hash<const StringBody, Value*> HashStringValue;
27: typedef Hash<const StringBody, PA_Object*> HashStringObject;
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) {
65: bark("is '%s', can not be used in expression");
66: return *static_cast<Value*>(0); // never
1.34 paf 67: }
1.59 parser 68:
1.110 paf 69:
70:
71: /** extract HashStringValue if any
72: WARNING: FOR LOCAL USE ONLY, THIS POINTER IS NOT TO PASS TO ANYBODY!
73: */
74: virtual HashStringValue* get_hash() { return 0; }
1.59 parser 75:
1.106 paf 76: /// extract const String
1.110 paf 77: virtual const String* get_string() { return 0; }
1.59 parser 78:
1.106 paf 79: /// extract double
1.110 paf 80: virtual double as_double() const { bark("is '%s', it does not have numerical (double) value"); return 0; }
1.59 parser 81:
1.106 paf 82: /// extract integer
1.110 paf 83: virtual int as_int () const { bark("is '%s', it does not have numerical (int) value"); return 0; }
1.59 parser 84:
1.106 paf 85: /// extract bool
1.110 paf 86: virtual bool as_bool() const { bark("is '%s', it does not have logical value"); return 0; }
1.59 parser 87:
1.106 paf 88: /// extract file
1.110 paf 89: virtual VFile* as_vfile(String::Language lang=String::L_UNSPECIFIED,
90: const Request_charsets* charsets=0);
1.59 parser 91:
1.106 paf 92: /// extract Junction
1.110 paf 93: virtual Junction* get_junction();
1.59 parser 94:
1.93 paf 95: /** extract base object of Value
96: @return for
97: - VObject: fbase
98: */
1.110 paf 99: virtual Value* base_object();
1.93 paf 100:
1.106 paf 101: /// extract Value element
1.110 paf 102: virtual Value* get_element(const String& /*aname*/, Value& /*aself*/, bool /*looking_up*/);
1.92 paf 103:
1.106 paf 104: /// store Value element under @a name
1.110 paf 105: virtual bool put_element(const String& aname, Value* /*avalue*/, bool /*areplace*/) {
1.65 parser 106: // to prevent modification of system classes,
107: // created at system startup, and not having exception
108: // handler installed, we neet to bark using request.pool
1.110 paf 109: bark("is '%s', it does not accept elements",
110: "element can not be stored to %s", &aname);
1.93 paf 111: return false;
1.65 parser 112: }
1.59 parser 113:
1.106 paf 114: /// extract VStateless_class
1.85 paf 115: virtual VStateless_class *get_class()=0;
1.107 paf 116:
117: /// extract VStateless_class
118: virtual VStateless_class *get_last_derived_class() {
119: return get_class();
120: };
1.108 paf 121: /// extract base object or class of Value, if any
1.110 paf 122: virtual Value* base() { return 0; }
1.32 paf 123:
1.106 paf 124: /// extract VTable
1.110 paf 125: virtual Table* get_table() { return 0; }
1.1 paf 126:
127: public: // usage
128:
1.26 paf 129: /// @return sure String. if it doesn't have string value barks
1.1 paf 130: const String& as_string() {
1.110 paf 131: const String* result=get_string();
1.1 paf 132: if(!result)
1.110 paf 133: bark("is '%s', it has no string representation");
1.6 paf 134:
1.1 paf 135: return *result;
136: }
137:
1.6 paf 138: protected:
1.1 paf 139:
1.22 paf 140: /// throws exception specifying bark-reason and name() type() of problematic value
1.65 parser 141: void bark(char *reason,
1.110 paf 142: const char* alt_reason=0, const String *problem_source=0) const {
1.80 paf 143: throw Exception("parser.runtime",
1.84 paf 144: problem_source,
145: alt_reason?alt_reason:reason, type());
1.1 paf 146: }
147:
1.17 paf 148: };
1.110 paf 149:
1.48 paf 150:
151: /**
1.110 paf 152: $content-type[text/html] ->
153: content-type: text/html
154: $content-type[$value[text/html] charset[windows-1251]] ->
155: content-type: text/html; charset=windows-1251
1.48 paf 156: */
1.110 paf 157: const String& attributed_meaning_to_string(Value& meaning,
158: String::Language lang,
159: bool forced=false);
160:
161: // defines
162:
163: ///@{common field names
164: #define CHARSET_NAME "charset"
165: #define VALUE_NAME "value"
166: #define CONTENT_TYPE_NAME "content-type"
167: //@}
168:
169: ///@{common field names
170: extern const String value_name;
171: extern const String content_type_name;
172: extern const String name_name;
173: ///@}
1.1 paf 174:
175: #endif
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