Annotation of parser3/src/types/pa_value.h, revision 1.34
1.22 paf 1: /** @file
1.24 paf 2: Parser: Value, Method, Junction class decls.
3:
1.1 paf 4: Copyright (c) 2001 ArtLebedev Group (http://www.artlebedev.com)
1.24 paf 5:
1.2 paf 6: Author: Alexander Petrosyan <paf@design.ru> (http://design.ru/paf)
1.1 paf 7:
1.34 ! paf 8: $Id: pa_value.h,v 1.33 2001/03/26 08:27:28 paf Exp $
1.1 paf 9: */
10:
11: #ifndef PA_VALUE_H
12: #define PA_VALUE_H
13:
14: #include "pa_pool.h"
15: #include "pa_string.h"
16: #include "pa_array.h"
17: #include "pa_exception.h"
1.13 paf 18: #include "pa_globals.h"
1.1 paf 19:
1.9 paf 20: class VStateless_class;
1.1 paf 21: class WContext;
22: class VAliased;
23: class Request;
1.7 paf 24: class VTable;
1.17 paf 25: class Junction;
26: class Method;
1.20 paf 27: class Hash;
1.1 paf 28:
1.31 paf 29: /// grandfather of all @a values in @b Parser
1.1 paf 30: class Value : public Pooled {
31: public: // Value
32:
1.22 paf 33: /// - all: for error reporting after fail(), etc
1.1 paf 34: virtual const char *type() const =0;
1.22 paf 35: /// - all: for error reporting after fail(), etc
1.1 paf 36: const String& name() const { return *fname; }
1.23 paf 37: /** is this value defined?
1.22 paf 38: @return for
1.25 paf 39: - VUnknown: false
1.22 paf 40: - others: true
41: */
1.1 paf 42: virtual bool get_defined() { return true; }
1.23 paf 43: /** what's the meaning of this value in context of expression?
1.22 paf 44: @return for
1.34 ! paf 45: - VString: fstring as VDouble or this depending on return_string_as_is
1.25 paf 46: - VBool: this
47: - VDouble: this
48: - VInt: this
49: - VUnknown: this
1.27 paf 50: - VFile: this
1.22 paf 51: */
1.34 ! paf 52: virtual Value *get_expr_result(bool return_string_as_is=false) {
! 53: bark("(%s) can not be used in expression"); return 0;
! 54: }
1.23 paf 55: /** extract Hash
1.22 paf 56: @return for
1.25 paf 57: - VHash: fhash
58: - VResponse: ffields
1.22 paf 59: */
1.20 paf 60: virtual Hash *get_hash() { return 0; }
1.23 paf 61: /** extract const String
1.22 paf 62: @return for
1.25 paf 63: - VString: value
64: - VUnknown: ""
65: - VDouble: value
66: - VBool: must be 0: so in ^if(1>2) it would'nt become "FALSE" string which is 'true'
1.22 paf 67: - others: 0
68: - WContext: accumulated fstring
69: */
1.1 paf 70: virtual const String *get_string() { return 0; }
1.23 paf 71: /** extract double
1.22 paf 72: @return for
1.25 paf 73: - VString: value
74: - VDouble: value
75: - VInt: finteger
76: - VBool: value
1.22 paf 77: */
1.7 paf 78: virtual double get_double() { bark("(%s) does not have numerical value"); return 0; }
1.23 paf 79: /** extract bool
1.22 paf 80: @return for
1.25 paf 81: - VUnknown: false
82: - VBool: value
83: - VInt: 0 or !0
84: - VDouble: 0 or !0
1.27 paf 85: - VFile: true
1.22 paf 86: */
1.15 paf 87: virtual bool get_bool() { bark("(%s) does not have logical value"); return 0; }
1.23 paf 88: /** extract Junction
1.22 paf 89: @return for
90: - junction: itself
91: */
1.1 paf 92: virtual Junction *get_junction() { return 0; }
1.23 paf 93: /** extract Value element
1.22 paf 94: @return for
1.25 paf 95: - VHash: (key)=value
1.29 paf 96: - VAliased: $CLASS, $BASE
97: - VStateless_class: +$method
98: - VStateless_object: +$method
1.25 paf 99: - VCode_frame: wcontext_transparent
1.26 paf 100: - VMethod_frame: my or self_transparent
1.25 paf 101: - VTable: column
1.28 paf 102: - VEnv: field
1.25 paf 103: - VForm: CLASS,BASE,method,field
104: - VString: $CLASS,$BASE,$method
1.30 paf 105: - VRequest: fields
1.25 paf 106: - VResponse: CLASS,BASE,method,fields
1.28 paf 107: - VCookie: field
1.27 paf 108: - VFile: CLASS,BASE,method,field
1.26 paf 109: */
1.7 paf 110: virtual Value *get_element(const String& name) { bark("(%s) does not have elements"); return 0; }
1.31 paf 111: /** store Value element under @a name
1.22 paf 112: @return for
1.25 paf 113: - VHash: (key)=value
114: - VStateless_object: (CLASS)=vclass;(BASE)=base;(method)=method_ref
1.26 paf 115: - VStateless_class: (field)=value - static values only
116: - VStateless_object: (field)=value
1.25 paf 117: - VCode_frame: wcontext_transparent
1.26 paf 118: - VMethod_frame: my or self_transparent
1.25 paf 119: - VResponse: (attribute)=value
120: - VCookie: field
1.22 paf 121: */
1.7 paf 122: virtual void put_element(const String& name, Value *value) { bark("(%s) does not accept elements"); }
1.23 paf 123: /** extract VStateless_class
1.22 paf 124: @return for
1.25 paf 125: - VStateless_class: this
126: - VStateless_object: fclass_real
1.26 paf 127: - WContext: none yet | transparent
1.22 paf 128: */
1.9 paf 129: virtual VStateless_class *get_class() { return 0; }
1.23 paf 130: /** extract VAliased
1.22 paf 131: @return for
1.33 paf 132: - VAliased: this
1.26 paf 133: - WContext: transparent
134: - VMethod_frame: self_transparent
1.22 paf 135: */
1.1 paf 136: virtual VAliased *get_aliased() { return 0; }
1.32 paf 137:
138: /** extract VTable
139: @return for
140: - VTable: this
141: */
142: virtual VTable *get_vtable() { return 0; }
1.1 paf 143:
144: public: // usage
145:
146: Value(Pool& apool) : Pooled(apool), fname(unnamed_name) {
147: }
148:
1.22 paf 149: /// set's the name which is used in error messages
1.1 paf 150: void set_name(const String& aname) { fname=&aname; }
151:
1.26 paf 152: /// @return sure String. if it doesn't have string value barks
1.1 paf 153: const String& as_string() {
154: const String *result=get_string();
155: if(!result)
1.7 paf 156: bark("(%s) not a string");
1.6 paf 157:
1.1 paf 158: return *result;
159: }
160:
161: private:
162:
163: const String *fname;
164:
1.6 paf 165: protected:
1.1 paf 166:
1.22 paf 167: /// throws exception specifying bark-reason and name() type() of problematic value
168: void bark(char *reason) const {
1.1 paf 169: THROW(0,0,
170: &name(),
1.22 paf 171: reason, type());
1.1 paf 172: }
173:
1.17 paf 174: };
175:
1.22 paf 176: /// native code method
1.17 paf 177: typedef void (*Native_code_ptr)(Request& request,
178: const String& method_name, Array *params);
179:
1.23 paf 180: /** \b junction is some code joined with context of it's evaluation.
1.22 paf 181:
182: there are code-junctions and method-junctions
183: - code-junctions are used when some parameter passed in cury brackets
184: - method-junctions used in ^method[] calls or $method references
185: */
1.17 paf 186: class Junction : public Pooled {
187: public:
188:
189: Junction(Pool& apool,
190: Value& aself,
191: VStateless_class *avclass, const Method *amethod,
192: Value *aroot,
193: Value *arcontext,
194: WContext *awcontext,
195: const Array *acode) : Pooled(apool),
196:
197: self(aself),
198: vclass(avclass), method(amethod),
199: root(aroot),
200: rcontext(arcontext),
201: wcontext(awcontext),
202: code(acode) {
203: }
204:
1.22 paf 205: /// always present
1.17 paf 206: Value& self;
1.22 paf 207: //@{
208: /// @name either these // so called 'method-junction'
1.17 paf 209: VStateless_class *vclass; const Method *method;
1.22 paf 210: //@}
211: //@{
212: /// @name or these are present // so called 'code-junction'
1.17 paf 213: Value *root;
214: Value *rcontext;
215: WContext *wcontext;
216: const Array *code;
1.22 paf 217: //@}
1.17 paf 218: };
219:
1.23 paf 220: /**
1.22 paf 221: class method.
222:
223: methods can have
224: - named or
225: - numbered parameters
226:
227: methods can be
228: - parser or
229: - native onces
230:
231: hold
232: - parameter names or number limits
233: - local names
234: - code [parser or native]
235: */
1.17 paf 236: class Method : public Pooled {
237: public:
1.22 paf 238: /// method name for error reporting
1.17 paf 239: const String& name;
1.22 paf 240: //@{
241: /// @name either numbered params // for native-code methods = operators
1.17 paf 242: int min_numbered_params_count, max_numbered_params_count;
1.22 paf 243: //@}
244: //@{
245: /// @name or named params&locals // for parser-code methods
1.17 paf 246: Array *params_names; Array *locals_names;
1.22 paf 247: //@}
248: //@{
249: /// @name the Code
1.17 paf 250: const Array *parser_code;/*OR*/Native_code_ptr native_code;
1.22 paf 251: //@}
1.17 paf 252:
253: Method(
254: Pool& apool,
255: const String& aname,
256: int amin_numbered_params_count, int amax_numbered_params_count,
257: Array *aparams_names, Array *alocals_names,
258: const Array *aparser_code, Native_code_ptr anative_code) :
259:
260: Pooled(apool),
261: name(aname),
262: min_numbered_params_count(amin_numbered_params_count),
263: max_numbered_params_count(amax_numbered_params_count),
264: params_names(aparams_names), locals_names(alocals_names),
265: parser_code(aparser_code), native_code(anative_code) {
266: }
267:
1.22 paf 268: /// call this before invoking to ensure proper actual numbered params count
1.17 paf 269: void check_actual_numbered_params(
270: Value& self, const String& actual_name, Array *actual_numbered_params) const {
271: int actual_count=actual_numbered_params?actual_numbered_params->size():0;
272: if(actual_count<min_numbered_params_count) // not proper count? bark
273: THROW(0, 0,
274: &actual_name,
275: "native method of %s (%s) accepts minimum %d parameter(s)",
276: self.name().cstr(),
277: self.type(),
278: min_numbered_params_count);
279:
280: }
1.1 paf 281: };
282:
283: #endif
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