Annotation of parser3/src/types/pa_value.h, revision 1.70.4.2
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:
1.70.4.2! parser 8: $Id: pa_value.h,v 1.70.4.1 2001/09/07 16:51:43 parser 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;
1.35 paf 24: class Table;
1.17 paf 25: class Junction;
26: class Method;
1.20 paf 27: class Hash;
1.42 paf 28: class VFile;
1.64 parser 29: class MethodParams;
1.1 paf 30:
1.31 paf 31: /// grandfather of all @a values in @b Parser
1.1 paf 32: class Value : public Pooled {
33: public: // Value
34:
1.53 paf 35: /// all: value type, used for error reporting and 'is' expression operator
1.1 paf 36: virtual const char *type() const =0;
1.59 parser 37:
1.1 paf 38: const String& name() const { return *fname; }
1.59 parser 39:
1.23 paf 40: /** is this value defined?
1.22 paf 41: @return for
1.63 parser 42: - VVoid: false
1.69 parser 43: - VString: eq ''=false, ne ''=true
1.70.4.1 parser 44: - VTable: count!=0
1.22 paf 45: - others: true
46: */
1.38 paf 47: virtual bool is_defined() const { return true; }
1.59 parser 48:
1.35 paf 49: /** is this value string?
50: @return for
51: - VString: true
52: - others: false
53: */
1.38 paf 54: virtual bool is_string() const { return false; }
1.59 parser 55:
1.23 paf 56: /** what's the meaning of this value in context of expression?
1.22 paf 57: @return for
1.34 paf 58: - VString: fstring as VDouble or this depending on return_string_as_is
1.70 parser 59: - VBool: clone
60: - VDouble: clone
61: - VInt: clone
1.63 parser 62: - VVoid: this
1.27 paf 63: - VFile: this
1.45 paf 64: - VImage: this
1.64 parser 65: - VDate: ftime -> float days
1.22 paf 66: */
1.35 paf 67: virtual Value *as_expr_result(bool return_string_as_is=false) {
1.34 paf 68: bark("(%s) can not be used in expression"); return 0;
69: }
1.59 parser 70:
1.23 paf 71: /** extract Hash
1.22 paf 72: @return for
1.25 paf 73: - VHash: fhash
74: - VResponse: ffields
1.22 paf 75: */
1.20 paf 76: virtual Hash *get_hash() { return 0; }
1.59 parser 77:
1.23 paf 78: /** extract const String
1.22 paf 79: @return for
1.25 paf 80: - VString: value
1.63 parser 81: - VVoid: ""
1.25 paf 82: - VDouble: value
1.66 parser 83: - VInt: value
1.25 paf 84: - VBool: must be 0: so in ^if(1>2) it would'nt become "FALSE" string which is 'true'
1.22 paf 85: - others: 0
86: - WContext: accumulated fstring
87: */
1.1 paf 88: virtual const String *get_string() { return 0; }
1.59 parser 89:
1.23 paf 90: /** extract double
1.22 paf 91: @return for
1.25 paf 92: - VString: value
93: - VDouble: value
1.59 parser 94: - VInt: value
1.25 paf 95: - VBool: value
1.63 parser 96: - VVoid: 0
1.64 parser 97: - VDate: ftime -> float days
1.22 paf 98: */
1.70.4.2! parser 99: virtual double as_double() const { bark("(%s) does not have numerical (double) value"); return 0; }
1.59 parser 100:
101: /** extract integer
102: - VString: value
103: - VDouble: value
104: - VInt: value
105: - VBool: value
1.63 parser 106: - VVoid: 0
1.59 parser 107: */
1.70.4.2! parser 108: virtual int as_int () const { bark("(%s) does not have numerical (int) value"); return 0; }
1.59 parser 109:
1.23 paf 110: /** extract bool
1.22 paf 111: @return for
1.63 parser 112: - VVoid: false
1.25 paf 113: - VBool: value
114: - VInt: 0 or !0
115: - VDouble: 0 or !0
1.27 paf 116: - VFile: true
1.64 parser 117: - VDate: 0 or !0
1.22 paf 118: */
1.70.4.2! parser 119: virtual bool as_bool() const { bark("(%s) does not have logical value"); return 0; }
1.59 parser 120:
1.42 paf 121: /** extract file
122: @return for
123: - VFile: this
124: - VString: vfile
1.45 paf 125: - VImage: true
1.42 paf 126: */
1.66 parser 127: virtual VFile *as_vfile(String::Untaint_lang lang=String::UL_UNSPECIFIED,
128: bool origins_mode=false) {
1.42 paf 129: bark("(%s) does not have file value"); return 0;
130: }
1.59 parser 131:
1.23 paf 132: /** extract Junction
1.22 paf 133: @return for
134: - junction: itself
135: */
1.1 paf 136: virtual Junction *get_junction() { return 0; }
1.59 parser 137:
1.23 paf 138: /** extract Value element
1.22 paf 139: @return for
1.25 paf 140: - VHash: (key)=value
1.67 parser 141: - VAliased: sometimes $CLASS [see VAliased::hide_class()]
1.29 paf 142: - VStateless_class: +$method
143: - VStateless_object: +$method
1.58 paf 144: - VClass: (field)=STATIC value;(method)=method_ref with self=object_class
1.51 paf 145: - VCodeFrame: wcontext_transparent
146: - VMethodFrame: my or self_transparent
1.52 paf 147: - VTable: columns,methods
1.28 paf 148: - VEnv: field
1.67 parser 149: - VForm: CLASS,method,field
1.45 paf 150: - VString: $method
1.30 paf 151: - VRequest: fields
1.45 paf 152: - VResponse: method,fields
1.28 paf 153: - VCookie: field
1.45 paf 154: - VFile: method,field
1.67 parser 155: - VDate: CLASS,method,field
1.26 paf 156: */
1.36 paf 157: virtual Value *get_element(const String& name) { bark("(%s) has no elements"); return 0; }
1.59 parser 158:
1.31 paf 159: /** store Value element under @a name
1.22 paf 160: @return for
1.25 paf 161: - VHash: (key)=value
1.67 parser 162: - VStateless_object: (CLASS)=vclass;(method)=method_ref
1.26 paf 163: - VStateless_class: (field)=value - static values only
164: - VStateless_object: (field)=value
1.51 paf 165: - VCodeFrame: wcontext_transparent
166: - VMethodFrame: my or self_transparent
1.25 paf 167: - VResponse: (attribute)=value
168: - VCookie: field
1.22 paf 169: */
1.65 parser 170: virtual void put_element(const String& name, Value *value) {
171: // to prevent modification of system classes,
172: // created at system startup, and not having exception
173: // handler installed, we neet to bark using request.pool
174: bark("(%s) does not accept elements",
175: "element can not be stored to %s", &name);
176: }
1.59 parser 177:
1.23 paf 178: /** extract VStateless_class
1.22 paf 179: @return for
1.25 paf 180: - VStateless_class: this
181: - VStateless_object: fclass_real
1.26 paf 182: - WContext: none yet | transparent
1.57 paf 183: - VHash: 0
1.22 paf 184: */
1.9 paf 185: virtual VStateless_class *get_class() { return 0; }
1.59 parser 186:
1.23 paf 187: /** extract VAliased
1.22 paf 188: @return for
1.33 paf 189: - VAliased: this
1.26 paf 190: - WContext: transparent
1.51 paf 191: - VMethodFrame: self_transparent
1.22 paf 192: */
1.1 paf 193: virtual VAliased *get_aliased() { return 0; }
1.32 paf 194:
195: /** extract VTable
196: @return for
1.35 paf 197: - VTable: ftable
1.32 paf 198: */
1.35 paf 199: virtual Table *get_table() { return 0; }
1.1 paf 200:
201: public: // usage
202:
203: Value(Pool& apool) : Pooled(apool), fname(unnamed_name) {
204: }
205:
1.22 paf 206: /// set's the name which is used in error messages
1.68 parser 207: void set_name(const String& aname) {
208: fname=&aname;
209: }
1.1 paf 210:
1.26 paf 211: /// @return sure String. if it doesn't have string value barks
1.1 paf 212: const String& as_string() {
213: const String *result=get_string();
214: if(!result)
1.35 paf 215: bark("(%s) has no string representation");
1.6 paf 216:
1.1 paf 217: return *result;
218: }
219:
220: private:
221:
222: const String *fname;
223:
1.6 paf 224: protected:
1.1 paf 225:
1.22 paf 226: /// throws exception specifying bark-reason and name() type() of problematic value
1.65 parser 227: void bark(char *reason,
228: const char *alt_reason=0, const String *problem_source=0) const {
229: Pool& pool=problem_source?problem_source->pool():this->pool();
230: PTHROW(0, 0,
231: problem_source?problem_source:&name(),
232: problem_source?alt_reason:reason, type());
1.1 paf 233: }
234:
1.17 paf 235: };
236:
1.23 paf 237: /** \b junction is some code joined with context of it's evaluation.
1.22 paf 238:
239: there are code-junctions and method-junctions
240: - code-junctions are used when some parameter passed in cury brackets
241: - method-junctions used in ^method[] calls or $method references
242: */
1.17 paf 243: class Junction : public Pooled {
244: public:
245:
246: Junction(Pool& apool,
247: Value& aself,
248: VStateless_class *avclass, const Method *amethod,
249: Value *aroot,
250: Value *arcontext,
251: WContext *awcontext,
252: const Array *acode) : Pooled(apool),
253:
254: self(aself),
255: vclass(avclass), method(amethod),
256: root(aroot),
257: rcontext(arcontext),
258: wcontext(awcontext),
259: code(acode) {
260: }
261:
1.22 paf 262: /// always present
1.17 paf 263: Value& self;
1.22 paf 264: //@{
265: /// @name either these // so called 'method-junction'
1.17 paf 266: VStateless_class *vclass; const Method *method;
1.22 paf 267: //@}
268: //@{
269: /// @name or these are present // so called 'code-junction'
1.17 paf 270: Value *root;
271: Value *rcontext;
272: WContext *wcontext;
273: const Array *code;
1.22 paf 274: //@}
1.48 paf 275: };
276:
277: /**
278: native code method
279: params can be NULL when
1.53 paf 280: method min&max params (see VStateless_class::add_native_method)
1.48 paf 281: counts are zero.
282: */
1.39 paf 283: typedef void (*Native_code_ptr)(Request& request,
284: const String& method_name,
1.48 paf 285: MethodParams *params);
1.39 paf 286:
1.23 paf 287: /**
1.22 paf 288: class method.
289:
290: methods can have
291: - named or
292: - numbered parameters
293:
294: methods can be
295: - parser or
296: - native onces
297:
1.40 paf 298: holds
1.22 paf 299: - parameter names or number limits
300: - local names
301: - code [parser or native]
302: */
1.17 paf 303: class Method : public Pooled {
304: public:
1.39 paf 305:
1.41 paf 306: /// allowed method call types
1.39 paf 307: enum Call_type {
1.41 paf 308: CT_ANY, ///< method can be called either statically or dynamically
309: CT_STATIC, ///< method can be called only statically
310: CT_DYNAMIC ///< method can be called only dynamically
1.39 paf 311: };
312:
313: /// name for error reporting
1.17 paf 314: const String& name;
1.39 paf 315: ///
316: Call_type call_type;
1.22 paf 317: //@{
318: /// @name either numbered params // for native-code methods = operators
1.17 paf 319: int min_numbered_params_count, max_numbered_params_count;
1.22 paf 320: //@}
321: //@{
322: /// @name or named params&locals // for parser-code methods
1.17 paf 323: Array *params_names; Array *locals_names;
1.22 paf 324: //@}
325: //@{
326: /// @name the Code
1.17 paf 327: const Array *parser_code;/*OR*/Native_code_ptr native_code;
1.22 paf 328: //@}
1.17 paf 329:
330: Method(
331: Pool& apool,
332: const String& aname,
1.39 paf 333: Call_type call_type,
1.17 paf 334: int amin_numbered_params_count, int amax_numbered_params_count,
335: Array *aparams_names, Array *alocals_names,
336: const Array *aparser_code, Native_code_ptr anative_code) :
337:
338: Pooled(apool),
339: name(aname),
1.39 paf 340: call_type(call_type),
1.17 paf 341: min_numbered_params_count(amin_numbered_params_count),
342: max_numbered_params_count(amax_numbered_params_count),
343: params_names(aparams_names), locals_names(alocals_names),
344: parser_code(aparser_code), native_code(anative_code) {
345: }
346:
1.22 paf 347: /// call this before invoking to ensure proper actual numbered params count
1.55 paf 348: void check_actual_numbered_params(Pool& pool,
1.17 paf 349: Value& self, const String& actual_name, Array *actual_numbered_params) const {
1.54 paf 350:
1.17 paf 351: int actual_count=actual_numbered_params?actual_numbered_params->size():0;
352: if(actual_count<min_numbered_params_count) // not proper count? bark
1.54 paf 353: PTHROW(0, 0,
1.17 paf 354: &actual_name,
1.47 paf 355: "native method of %s (%s) accepts minimum %d parameter(s) (%d present)",
1.17 paf 356: self.name().cstr(),
357: self.type(),
1.47 paf 358: min_numbered_params_count,
359: actual_count);
1.17 paf 360:
361: }
1.1 paf 362: };
363:
364: #endif
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