Annotation of parser3/src/types/pa_value.h, revision 1.58
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:
1.58 ! paf 8: $Id: pa_value.h,v 1.57 2001/05/08 10:39:23 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;
1.35 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;
1.1 paf 29:
1.31 paf 30: /// grandfather of all @a values in @b Parser
1.1 paf 31: class Value : public Pooled {
32: public: // Value
33:
1.53 paf 34: /// all: value type, used for error reporting and 'is' expression operator
1.1 paf 35: virtual const char *type() const =0;
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: */
1.38 paf 42: virtual bool is_defined() const { return true; }
1.35 paf 43: /** is this value string?
44: @return for
45: - VString: true
46: - others: false
47: */
1.38 paf 48: virtual bool is_string() const { return false; }
1.23 paf 49: /** what's the meaning of this value in context of expression?
1.22 paf 50: @return for
1.34 paf 51: - VString: fstring as VDouble or this depending on return_string_as_is
1.25 paf 52: - VBool: this
53: - VDouble: this
54: - VInt: this
55: - VUnknown: this
1.27 paf 56: - VFile: this
1.45 paf 57: - VImage: this
1.22 paf 58: */
1.35 paf 59: virtual Value *as_expr_result(bool return_string_as_is=false) {
1.34 paf 60: bark("(%s) can not be used in expression"); return 0;
61: }
1.23 paf 62: /** extract Hash
1.22 paf 63: @return for
1.25 paf 64: - VHash: fhash
65: - VResponse: ffields
1.22 paf 66: */
1.20 paf 67: virtual Hash *get_hash() { return 0; }
1.23 paf 68: /** extract const String
1.22 paf 69: @return for
1.25 paf 70: - VString: value
71: - VUnknown: ""
72: - VDouble: value
73: - VBool: must be 0: so in ^if(1>2) it would'nt become "FALSE" string which is 'true'
1.22 paf 74: - others: 0
75: - WContext: accumulated fstring
76: */
1.1 paf 77: virtual const String *get_string() { return 0; }
1.23 paf 78: /** extract double
1.22 paf 79: @return for
1.25 paf 80: - VString: value
81: - VDouble: value
82: - VInt: finteger
83: - VBool: value
1.37 paf 84: - VUnknown: 0
1.22 paf 85: */
1.35 paf 86: virtual double as_double() { bark("(%s) does not have numerical value"); return 0; }
1.23 paf 87: /** extract bool
1.22 paf 88: @return for
1.25 paf 89: - VUnknown: false
90: - VBool: value
91: - VInt: 0 or !0
92: - VDouble: 0 or !0
1.27 paf 93: - VFile: true
1.22 paf 94: */
1.35 paf 95: virtual bool as_bool() { bark("(%s) does not have logical value"); return 0; }
1.42 paf 96: /** extract file
97: @return for
98: - VFile: this
99: - VString: vfile
1.45 paf 100: - VImage: true
1.42 paf 101: */
1.46 paf 102: virtual const VFile *as_vfile(String::Untaint_lang lang=String::UL_UNSPECIFIED) const {
1.42 paf 103: bark("(%s) does not have file value"); return 0;
104: }
1.23 paf 105: /** extract Junction
1.22 paf 106: @return for
107: - junction: itself
108: */
1.1 paf 109: virtual Junction *get_junction() { return 0; }
1.23 paf 110: /** extract Value element
1.22 paf 111: @return for
1.25 paf 112: - VHash: (key)=value
1.45 paf 113: - VAliased: sometimes $CLASS, $BASE [@see VAliased::hide_class()]
1.29 paf 114: - VStateless_class: +$method
115: - VStateless_object: +$method
1.58 ! paf 116: - VClass: (field)=STATIC value;(method)=method_ref with self=object_class
1.51 paf 117: - VCodeFrame: wcontext_transparent
118: - VMethodFrame: my or self_transparent
1.52 paf 119: - VTable: columns,methods
1.28 paf 120: - VEnv: field
1.25 paf 121: - VForm: CLASS,BASE,method,field
1.45 paf 122: - VString: $method
1.30 paf 123: - VRequest: fields
1.45 paf 124: - VResponse: method,fields
1.28 paf 125: - VCookie: field
1.45 paf 126: - VFile: method,field
1.26 paf 127: */
1.36 paf 128: virtual Value *get_element(const String& name) { bark("(%s) has no elements"); return 0; }
1.31 paf 129: /** store Value element under @a name
1.22 paf 130: @return for
1.25 paf 131: - VHash: (key)=value
132: - VStateless_object: (CLASS)=vclass;(BASE)=base;(method)=method_ref
1.26 paf 133: - VStateless_class: (field)=value - static values only
134: - VStateless_object: (field)=value
1.51 paf 135: - VCodeFrame: wcontext_transparent
136: - VMethodFrame: my or self_transparent
1.25 paf 137: - VResponse: (attribute)=value
138: - VCookie: field
1.22 paf 139: */
1.7 paf 140: virtual void put_element(const String& name, Value *value) { bark("(%s) does not accept elements"); }
1.23 paf 141: /** extract VStateless_class
1.22 paf 142: @return for
1.25 paf 143: - VStateless_class: this
144: - VStateless_object: fclass_real
1.26 paf 145: - WContext: none yet | transparent
1.57 paf 146: - VHash: 0
1.22 paf 147: */
1.9 paf 148: virtual VStateless_class *get_class() { return 0; }
1.23 paf 149: /** extract VAliased
1.22 paf 150: @return for
1.33 paf 151: - VAliased: this
1.26 paf 152: - WContext: transparent
1.51 paf 153: - VMethodFrame: self_transparent
1.22 paf 154: */
1.1 paf 155: virtual VAliased *get_aliased() { return 0; }
1.32 paf 156:
157: /** extract VTable
158: @return for
1.35 paf 159: - VTable: ftable
1.32 paf 160: */
1.35 paf 161: virtual Table *get_table() { return 0; }
1.1 paf 162:
163: public: // usage
164:
165: Value(Pool& apool) : Pooled(apool), fname(unnamed_name) {
166: }
167:
1.22 paf 168: /// set's the name which is used in error messages
1.1 paf 169: void set_name(const String& aname) { fname=&aname; }
170:
1.26 paf 171: /// @return sure String. if it doesn't have string value barks
1.1 paf 172: const String& as_string() {
173: const String *result=get_string();
174: if(!result)
1.35 paf 175: bark("(%s) has no string representation");
1.6 paf 176:
1.1 paf 177: return *result;
178: }
179:
180: private:
181:
182: const String *fname;
183:
1.6 paf 184: protected:
1.1 paf 185:
1.22 paf 186: /// throws exception specifying bark-reason and name() type() of problematic value
187: void bark(char *reason) const {
1.44 paf 188: THROW(0, 0,
1.1 paf 189: &name(),
1.22 paf 190: reason, type());
1.1 paf 191: }
192:
1.17 paf 193: };
194:
1.23 paf 195: /** \b junction is some code joined with context of it's evaluation.
1.22 paf 196:
197: there are code-junctions and method-junctions
198: - code-junctions are used when some parameter passed in cury brackets
199: - method-junctions used in ^method[] calls or $method references
200: */
1.17 paf 201: class Junction : public Pooled {
202: public:
203:
204: Junction(Pool& apool,
205: Value& aself,
206: VStateless_class *avclass, const Method *amethod,
207: Value *aroot,
208: Value *arcontext,
209: WContext *awcontext,
210: const Array *acode) : Pooled(apool),
211:
212: self(aself),
213: vclass(avclass), method(amethod),
214: root(aroot),
215: rcontext(arcontext),
216: wcontext(awcontext),
217: code(acode) {
218: }
219:
1.22 paf 220: /// always present
1.17 paf 221: Value& self;
1.22 paf 222: //@{
223: /// @name either these // so called 'method-junction'
1.17 paf 224: VStateless_class *vclass; const Method *method;
1.22 paf 225: //@}
226: //@{
227: /// @name or these are present // so called 'code-junction'
1.17 paf 228: Value *root;
229: Value *rcontext;
230: WContext *wcontext;
231: const Array *code;
1.22 paf 232: //@}
1.17 paf 233: };
234:
1.48 paf 235: /**
236: @b method parameters passed in this array.
237: contains handy typecast ad junction/not junction ensurers
238:
239: */
240: class MethodParams : public Array {
241: public:
242: MethodParams(Pool& pool, const String& amethod_name) : Array(pool),
243: fmethod_name(amethod_name) {
244: }
245:
246: /// handy typecast. I long for templates
1.49 paf 247: Value& get(int index) { return *static_cast<Value *>(Array::get(index)); }
1.48 paf 248: /// handy is-value-a-junction ensurer
1.49 paf 249: Value& get_junction(int index, const char *msg) { return get_as(index, true, msg); }
1.48 paf 250: /// handy value-is-not-a-junction ensurer
1.49 paf 251: Value& get_no_junction(int index, const char *msg) { return get_as(index, false, msg); }
1.48 paf 252:
253: private:
254:
255: /// handy value-is/not-a-junction ensurer
1.49 paf 256: Value& get_as(int index, bool as_junction, const char *msg) {
1.48 paf 257: Value& result=get(index);
1.49 paf 258: if((result.get_junction()!=0) ^ as_junction)
1.48 paf 259: THROW(0, 0,
260: &fmethod_name,
1.56 paf 261: "%s", msg);
1.48 paf 262: return result;
263: }
264:
265: private:
266:
267: const String& fmethod_name;
268:
269: };
270:
271: /**
272: native code method
273: params can be NULL when
1.53 paf 274: method min&max params (see VStateless_class::add_native_method)
1.48 paf 275: counts are zero.
276: */
1.39 paf 277: typedef void (*Native_code_ptr)(Request& request,
278: const String& method_name,
1.48 paf 279: MethodParams *params);
1.39 paf 280:
1.23 paf 281: /**
1.22 paf 282: class method.
283:
284: methods can have
285: - named or
286: - numbered parameters
287:
288: methods can be
289: - parser or
290: - native onces
291:
1.40 paf 292: holds
1.22 paf 293: - parameter names or number limits
294: - local names
295: - code [parser or native]
296: */
1.17 paf 297: class Method : public Pooled {
298: public:
1.39 paf 299:
1.41 paf 300: /// allowed method call types
1.39 paf 301: enum Call_type {
1.41 paf 302: CT_ANY, ///< method can be called either statically or dynamically
303: CT_STATIC, ///< method can be called only statically
304: CT_DYNAMIC ///< method can be called only dynamically
1.39 paf 305: };
306:
307: /// name for error reporting
1.17 paf 308: const String& name;
1.39 paf 309: ///
310: Call_type call_type;
1.22 paf 311: //@{
312: /// @name either numbered params // for native-code methods = operators
1.17 paf 313: int min_numbered_params_count, max_numbered_params_count;
1.22 paf 314: //@}
315: //@{
316: /// @name or named params&locals // for parser-code methods
1.17 paf 317: Array *params_names; Array *locals_names;
1.22 paf 318: //@}
319: //@{
320: /// @name the Code
1.17 paf 321: const Array *parser_code;/*OR*/Native_code_ptr native_code;
1.22 paf 322: //@}
1.17 paf 323:
324: Method(
325: Pool& apool,
326: const String& aname,
1.39 paf 327: Call_type call_type,
1.17 paf 328: int amin_numbered_params_count, int amax_numbered_params_count,
329: Array *aparams_names, Array *alocals_names,
330: const Array *aparser_code, Native_code_ptr anative_code) :
331:
332: Pooled(apool),
333: name(aname),
1.39 paf 334: call_type(call_type),
1.17 paf 335: min_numbered_params_count(amin_numbered_params_count),
336: max_numbered_params_count(amax_numbered_params_count),
337: params_names(aparams_names), locals_names(alocals_names),
338: parser_code(aparser_code), native_code(anative_code) {
339: }
340:
1.22 paf 341: /// call this before invoking to ensure proper actual numbered params count
1.55 paf 342: void check_actual_numbered_params(Pool& pool,
1.17 paf 343: Value& self, const String& actual_name, Array *actual_numbered_params) const {
1.54 paf 344:
1.17 paf 345: int actual_count=actual_numbered_params?actual_numbered_params->size():0;
346: if(actual_count<min_numbered_params_count) // not proper count? bark
1.54 paf 347: PTHROW(0, 0,
1.17 paf 348: &actual_name,
1.47 paf 349: "native method of %s (%s) accepts minimum %d parameter(s) (%d present)",
1.17 paf 350: self.name().cstr(),
351: self.type(),
1.47 paf 352: min_numbered_params_count,
353: actual_count);
1.17 paf 354:
355: }
1.1 paf 356: };
357:
358: #endif
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