Annotation of parser3/src/types/pa_value.h, revision 1.67
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:
1.67 ! parser 8: $Id: pa_value.h,v 1.66 2001/07/18 10:06:04 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
1.22 paf 43: - others: true
44: */
1.38 paf 45: virtual bool is_defined() const { return true; }
1.59 parser 46:
1.35 paf 47: /** is this value string?
48: @return for
49: - VString: true
50: - others: false
51: */
1.38 paf 52: virtual bool is_string() const { return false; }
1.59 parser 53:
1.23 paf 54: /** what's the meaning of this value in context of expression?
1.22 paf 55: @return for
1.34 paf 56: - VString: fstring as VDouble or this depending on return_string_as_is
1.25 paf 57: - VBool: this
58: - VDouble: this
59: - VInt: this
1.63 parser 60: - VVoid: this
1.27 paf 61: - VFile: this
1.45 paf 62: - VImage: this
1.64 parser 63: - VDate: ftime -> float days
1.22 paf 64: */
1.35 paf 65: virtual Value *as_expr_result(bool return_string_as_is=false) {
1.34 paf 66: bark("(%s) can not be used in expression"); return 0;
67: }
1.59 parser 68:
1.23 paf 69: /** extract Hash
1.22 paf 70: @return for
1.25 paf 71: - VHash: fhash
72: - VResponse: ffields
1.22 paf 73: */
1.20 paf 74: virtual Hash *get_hash() { return 0; }
1.59 parser 75:
1.23 paf 76: /** extract const String
1.22 paf 77: @return for
1.25 paf 78: - VString: value
1.63 parser 79: - VVoid: ""
1.25 paf 80: - VDouble: value
1.66 parser 81: - VInt: value
1.25 paf 82: - VBool: must be 0: so in ^if(1>2) it would'nt become "FALSE" string which is 'true'
1.22 paf 83: - others: 0
84: - WContext: accumulated fstring
85: */
1.1 paf 86: virtual const String *get_string() { return 0; }
1.59 parser 87:
1.23 paf 88: /** extract double
1.22 paf 89: @return for
1.25 paf 90: - VString: value
91: - VDouble: value
1.59 parser 92: - VInt: value
1.25 paf 93: - VBool: value
1.63 parser 94: - VVoid: 0
1.64 parser 95: - VDate: ftime -> float days
1.22 paf 96: */
1.59 parser 97: virtual double as_double() { bark("(%s) does not have numerical (double) value"); return 0; }
98:
99: /** extract integer
100: - VString: value
101: - VDouble: value
102: - VInt: value
103: - VBool: value
1.63 parser 104: - VVoid: 0
1.59 parser 105: */
106: virtual int as_int () { bark("(%s) does not have numerical (int) value"); return 0; }
107:
1.23 paf 108: /** extract bool
1.22 paf 109: @return for
1.63 parser 110: - VVoid: false
1.25 paf 111: - VBool: value
112: - VInt: 0 or !0
113: - VDouble: 0 or !0
1.27 paf 114: - VFile: true
1.64 parser 115: - VDate: 0 or !0
1.22 paf 116: */
1.35 paf 117: virtual bool as_bool() { bark("(%s) does not have logical value"); return 0; }
1.59 parser 118:
1.42 paf 119: /** extract file
120: @return for
121: - VFile: this
122: - VString: vfile
1.45 paf 123: - VImage: true
1.42 paf 124: */
1.66 parser 125: virtual VFile *as_vfile(String::Untaint_lang lang=String::UL_UNSPECIFIED,
126: bool origins_mode=false) {
1.42 paf 127: bark("(%s) does not have file value"); return 0;
128: }
1.59 parser 129:
1.23 paf 130: /** extract Junction
1.22 paf 131: @return for
132: - junction: itself
133: */
1.1 paf 134: virtual Junction *get_junction() { return 0; }
1.59 parser 135:
1.23 paf 136: /** extract Value element
1.22 paf 137: @return for
1.25 paf 138: - VHash: (key)=value
1.67 ! parser 139: - VAliased: sometimes $CLASS [see VAliased::hide_class()]
1.29 paf 140: - VStateless_class: +$method
141: - VStateless_object: +$method
1.58 paf 142: - VClass: (field)=STATIC value;(method)=method_ref with self=object_class
1.51 paf 143: - VCodeFrame: wcontext_transparent
144: - VMethodFrame: my or self_transparent
1.52 paf 145: - VTable: columns,methods
1.28 paf 146: - VEnv: field
1.67 ! parser 147: - VForm: CLASS,method,field
1.45 paf 148: - VString: $method
1.30 paf 149: - VRequest: fields
1.45 paf 150: - VResponse: method,fields
1.28 paf 151: - VCookie: field
1.45 paf 152: - VFile: method,field
1.67 ! parser 153: - VDate: CLASS,method,field
1.26 paf 154: */
1.36 paf 155: virtual Value *get_element(const String& name) { bark("(%s) has no elements"); return 0; }
1.59 parser 156:
1.31 paf 157: /** store Value element under @a name
1.22 paf 158: @return for
1.25 paf 159: - VHash: (key)=value
1.67 ! parser 160: - VStateless_object: (CLASS)=vclass;(method)=method_ref
1.26 paf 161: - VStateless_class: (field)=value - static values only
162: - VStateless_object: (field)=value
1.51 paf 163: - VCodeFrame: wcontext_transparent
164: - VMethodFrame: my or self_transparent
1.25 paf 165: - VResponse: (attribute)=value
166: - VCookie: field
1.22 paf 167: */
1.65 parser 168: virtual void put_element(const String& name, Value *value) {
169: // to prevent modification of system classes,
170: // created at system startup, and not having exception
171: // handler installed, we neet to bark using request.pool
172: bark("(%s) does not accept elements",
173: "element can not be stored to %s", &name);
174: }
1.59 parser 175:
1.23 paf 176: /** extract VStateless_class
1.22 paf 177: @return for
1.25 paf 178: - VStateless_class: this
179: - VStateless_object: fclass_real
1.26 paf 180: - WContext: none yet | transparent
1.57 paf 181: - VHash: 0
1.22 paf 182: */
1.9 paf 183: virtual VStateless_class *get_class() { return 0; }
1.59 parser 184:
1.23 paf 185: /** extract VAliased
1.22 paf 186: @return for
1.33 paf 187: - VAliased: this
1.26 paf 188: - WContext: transparent
1.51 paf 189: - VMethodFrame: self_transparent
1.22 paf 190: */
1.1 paf 191: virtual VAliased *get_aliased() { return 0; }
1.32 paf 192:
193: /** extract VTable
194: @return for
1.35 paf 195: - VTable: ftable
1.32 paf 196: */
1.35 paf 197: virtual Table *get_table() { return 0; }
1.1 paf 198:
199: public: // usage
200:
201: Value(Pool& apool) : Pooled(apool), fname(unnamed_name) {
202: }
203:
1.22 paf 204: /// set's the name which is used in error messages
1.1 paf 205: void set_name(const String& aname) { fname=&aname; }
206:
1.26 paf 207: /// @return sure String. if it doesn't have string value barks
1.1 paf 208: const String& as_string() {
209: const String *result=get_string();
210: if(!result)
1.35 paf 211: bark("(%s) has no string representation");
1.6 paf 212:
1.1 paf 213: return *result;
214: }
215:
216: private:
217:
218: const String *fname;
219:
1.6 paf 220: protected:
1.1 paf 221:
1.22 paf 222: /// throws exception specifying bark-reason and name() type() of problematic value
1.65 parser 223: void bark(char *reason,
224: const char *alt_reason=0, const String *problem_source=0) const {
225: Pool& pool=problem_source?problem_source->pool():this->pool();
226: PTHROW(0, 0,
227: problem_source?problem_source:&name(),
228: problem_source?alt_reason:reason, type());
1.1 paf 229: }
230:
1.17 paf 231: };
232:
1.23 paf 233: /** \b junction is some code joined with context of it's evaluation.
1.22 paf 234:
235: there are code-junctions and method-junctions
236: - code-junctions are used when some parameter passed in cury brackets
237: - method-junctions used in ^method[] calls or $method references
238: */
1.17 paf 239: class Junction : public Pooled {
240: public:
241:
242: Junction(Pool& apool,
243: Value& aself,
244: VStateless_class *avclass, const Method *amethod,
245: Value *aroot,
246: Value *arcontext,
247: WContext *awcontext,
248: const Array *acode) : Pooled(apool),
249:
250: self(aself),
251: vclass(avclass), method(amethod),
252: root(aroot),
253: rcontext(arcontext),
254: wcontext(awcontext),
255: code(acode) {
256: }
257:
1.22 paf 258: /// always present
1.17 paf 259: Value& self;
1.22 paf 260: //@{
261: /// @name either these // so called 'method-junction'
1.17 paf 262: VStateless_class *vclass; const Method *method;
1.22 paf 263: //@}
264: //@{
265: /// @name or these are present // so called 'code-junction'
1.17 paf 266: Value *root;
267: Value *rcontext;
268: WContext *wcontext;
269: const Array *code;
1.22 paf 270: //@}
1.48 paf 271: };
272:
273: /**
274: native code method
275: params can be NULL when
1.53 paf 276: method min&max params (see VStateless_class::add_native_method)
1.48 paf 277: counts are zero.
278: */
1.39 paf 279: typedef void (*Native_code_ptr)(Request& request,
280: const String& method_name,
1.48 paf 281: MethodParams *params);
1.39 paf 282:
1.23 paf 283: /**
1.22 paf 284: class method.
285:
286: methods can have
287: - named or
288: - numbered parameters
289:
290: methods can be
291: - parser or
292: - native onces
293:
1.40 paf 294: holds
1.22 paf 295: - parameter names or number limits
296: - local names
297: - code [parser or native]
298: */
1.17 paf 299: class Method : public Pooled {
300: public:
1.39 paf 301:
1.41 paf 302: /// allowed method call types
1.39 paf 303: enum Call_type {
1.41 paf 304: CT_ANY, ///< method can be called either statically or dynamically
305: CT_STATIC, ///< method can be called only statically
306: CT_DYNAMIC ///< method can be called only dynamically
1.39 paf 307: };
308:
309: /// name for error reporting
1.17 paf 310: const String& name;
1.39 paf 311: ///
312: Call_type call_type;
1.22 paf 313: //@{
314: /// @name either numbered params // for native-code methods = operators
1.17 paf 315: int min_numbered_params_count, max_numbered_params_count;
1.22 paf 316: //@}
317: //@{
318: /// @name or named params&locals // for parser-code methods
1.17 paf 319: Array *params_names; Array *locals_names;
1.22 paf 320: //@}
321: //@{
322: /// @name the Code
1.17 paf 323: const Array *parser_code;/*OR*/Native_code_ptr native_code;
1.22 paf 324: //@}
1.17 paf 325:
326: Method(
327: Pool& apool,
328: const String& aname,
1.39 paf 329: Call_type call_type,
1.17 paf 330: int amin_numbered_params_count, int amax_numbered_params_count,
331: Array *aparams_names, Array *alocals_names,
332: const Array *aparser_code, Native_code_ptr anative_code) :
333:
334: Pooled(apool),
335: name(aname),
1.39 paf 336: call_type(call_type),
1.17 paf 337: min_numbered_params_count(amin_numbered_params_count),
338: max_numbered_params_count(amax_numbered_params_count),
339: params_names(aparams_names), locals_names(alocals_names),
340: parser_code(aparser_code), native_code(anative_code) {
341: }
342:
1.22 paf 343: /// call this before invoking to ensure proper actual numbered params count
1.55 paf 344: void check_actual_numbered_params(Pool& pool,
1.17 paf 345: Value& self, const String& actual_name, Array *actual_numbered_params) const {
1.54 paf 346:
1.17 paf 347: int actual_count=actual_numbered_params?actual_numbered_params->size():0;
348: if(actual_count<min_numbered_params_count) // not proper count? bark
1.54 paf 349: PTHROW(0, 0,
1.17 paf 350: &actual_name,
1.47 paf 351: "native method of %s (%s) accepts minimum %d parameter(s) (%d present)",
1.17 paf 352: self.name().cstr(),
353: self.type(),
1.47 paf 354: min_numbered_params_count,
355: actual_count);
1.17 paf 356:
357: }
1.1 paf 358: };
359:
360: #endif
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