Annotation of parser3/src/types/pa_vmethod_frame.h, revision 1.120
1.3 paf 1: /** @file
1.5 paf 2: Parser: @b method_frame write context
1.3 paf 3:
1.98 moko 4: Copyright (c) 2001-2015 Art. Lebedev Studio (http://www.artlebedev.com)
1.22 paf 5: Author: Alexandr Petrosian <paf@design.ru> (http://paf.design.ru)
1.1 paf 6: */
7:
8: #ifndef PA_VMETHOD_FRAME_H
9: #define PA_VMETHOD_FRAME_H
1.28 paf 10:
1.120 ! moko 11: #define IDENT_PA_VMETHOD_FRAME_H "$Id: pa_vmethod_frame.h,v 1.119 2016/11/29 15:20:18 moko Exp $"
1.1 paf 12:
1.101 moko 13: #include "pa_symbols.h"
1.1 paf 14: #include "pa_wcontext.h"
1.12 parser 15: #include "pa_vvoid.h"
1.1 paf 16: #include "pa_vjunction.h"
17:
1.46 paf 18: // forwards
19:
20: class Request;
21:
22: /**
23: @b method parameters passed in this array.
24: contains handy typecast ad junction/not junction ensurers
1.114 moko 25: */
1.46 paf 26:
1.78 misha 27: class MethodParams {
1.46 paf 28: public:
1.109 moko 29: MethodParams() : felements(0), fused(0) {}
1.78 misha 30:
1.82 misha 31: #ifdef USE_DESTRUCTORS
1.109 moko 32: ~MethodParams() {
1.82 misha 33: Value **flast=felements+count();
1.95 moko 34: for(Value **current=felements;current<flast;current++){
35: Junction* junction=(*current)->get_junction();
36: if (junction && junction->code)
1.111 moko 37: delete (VJunction*)(*current);
1.95 moko 38: }
1.82 misha 39: }
40: #endif
41:
1.109 moko 42: void store_params(Value **params, size_t count) {
1.78 misha 43: felements=params;
1.77 misha 44: fused=count;
45: }
46:
1.78 misha 47: inline size_t count() const { return fused; }
48:
1.108 moko 49: inline Value& get(size_t index) const {
1.78 misha 50: assert(index<count());
1.108 moko 51: return *felements[index];
1.78 misha 52: }
53:
1.108 moko 54: inline Value& operator[] (size_t index) { return get(index); }
1.46 paf 55:
56: /// handy is-value-a-junction ensurer
1.109 moko 57: Value& as_junction(int index, const char* msg) {
1.108 moko 58: Value& value=get(index);
1.110 moko 59: if(value.get_junction())
60: return value;
61: throw Exception(PARSER_RUNTIME, 0, "%s (parameter #%d)", msg, 1+index);
1.46 paf 62: }
1.107 moko 63:
1.46 paf 64: /// handy value-is-not-a-junction ensurer
1.109 moko 65: Value& as_no_junction(int index, const char* msg) {
1.108 moko 66: Value& value=get(index);
1.110 moko 67: if(!value.get_junction())
68: return value;
69: throw Exception(PARSER_RUNTIME, 0, "%s (parameter #%d)", msg, 1+index);
1.46 paf 70: }
1.107 moko 71:
1.62 misha 72: /// handy is-value-a-junction ensurer or can be auto-processed
1.109 moko 73: Value& as_expression(int index, const char* msg) {
1.108 moko 74: Value& value=get(index);
1.110 moko 75: if(value.is_evaluated_expr())
1.107 moko 76: return value;
1.110 moko 77: if(value.get_junction())
1.107 moko 78: return value;
1.110 moko 79: throw Exception(PARSER_RUNTIME, 0, "%s (parameter #%d)", msg, 1+index);
1.62 misha 80: }
1.107 moko 81:
1.46 paf 82: /// handy expression auto-processing to double
1.107 moko 83: double as_double(int index, const char* msg, Request& r) {
1.108 moko 84: Value& value=get(index);
1.107 moko 85: if(value.is_evaluated_expr())
86: return value.as_double();
87: return get_processed(value, msg, index, r).as_double();
1.46 paf 88: }
1.107 moko 89:
1.46 paf 90: /// handy expression auto-processing to int
1.107 moko 91: int as_int(int index, const char* msg, Request& r) {
1.108 moko 92: Value& value=get(index);
1.107 moko 93: if(value.is_evaluated_expr())
94: return value.as_int();
95: return get_processed(value, msg, index, r).as_int();
1.46 paf 96: }
1.107 moko 97:
1.46 paf 98: /// handy expression auto-processing to bool
1.107 moko 99: bool as_bool(int index, const char* msg, Request& r) {
1.108 moko 100: Value& value=get(index);
1.107 moko 101: if(value.is_evaluated_expr())
102: return value.as_bool();
103: return get_processed(value, msg, index, r).as_bool();
1.46 paf 104: }
1.107 moko 105:
1.46 paf 106: /// handy string ensurer
1.109 moko 107: const String& as_string(int index, const char* msg) {
1.46 paf 108: return as_no_junction(index, msg).as_string();
109: }
1.107 moko 110:
1.93 misha 111: /// handy hash ensurers
112: HashStringValue* as_hash(int index, const char* name=0);
1.107 moko 113:
1.93 misha 114: /// handy table ensurer
115: Table* as_table(int index, const char* name=0);
116:
1.46 paf 117: private:
118:
1.78 misha 119: Value **felements;
120: size_t fused;
121:
1.107 moko 122: Value& get_processed(Value& value, const char* msg, int index, Request& r);
1.46 paf 123:
124: };
125:
1.114 moko 126: /**
127: Method frame write context
1.4 paf 128: accepts values written by method code
1.3 paf 129: */
1.114 moko 130:
1.46 paf 131: class VMethodFrame: public WContext {
1.63 misha 132: protected:
1.46 paf 133: VMethodFrame *fcaller;
1.114 moko 134: Value& fself;
135:
136: public: // Value
137:
138: override const char* type() const { return "method_frame"; }
139:
140: /// VMethodFrame: self_transparent
141: override VStateless_class* get_class() { return self().get_class(); }
142:
143: /// VMethodFrame: self_transparent
144: override VStateless_class* base() { return self().base(); }
145:
146: public: // usage
147:
148: VMethodFrame(const Method& amethod, VMethodFrame *acaller, Value& aself):
149: WContext(0 /* no parent, junctions can be reattached only up to VMethodFrame */),
150: fcaller(acaller),
151: fself(aself),
152: method(amethod) {
153: }
154:
155: VMethodFrame *caller() { return fcaller; }
156:
157: Value& self() { return fself; }
158:
159: void check_call_type(){
1.115 moko 160: if(method.call_type==Method::CT_ANY)
161: return;
162:
1.114 moko 163: Method::Call_type call_type=self().get_class()==&self() ? Method::CT_STATIC : Method::CT_DYNAMIC;
1.115 moko 164:
165: if(method.call_type!=call_type) // call type not allowed?
1.114 moko 166: throw Exception(PARSER_RUNTIME, 0, "is not allowed to be called %s", call_type==Method::CT_STATIC ? "statically" : "dynamically");
167: }
168:
169: public:
170:
171: const Method& method;
172: };
1.46 paf 173:
174:
1.114 moko 175: class VNativeMethodFrame: public VMethodFrame {
176: protected:
177: MethodParams fnumbered_params;
1.46 paf 178:
1.114 moko 179: public: // usage
180:
181: VNativeMethodFrame(const Method& amethod, VMethodFrame *acaller, Value& aself) : VMethodFrame(amethod, acaller, aself){}
182:
183: void store_params(Value **params, size_t count) {
184: fnumbered_params.store_params(params, count);
185: method.check_actual_numbered_params(self(), &fnumbered_params);
186: }
187:
188: void empty_params() {
189: method.check_actual_numbered_params(self(), &fnumbered_params);
190: }
191:
192: void call(Request &r);
193:
194: };
195:
196:
197: /**
198: Handles named parameters and local variables
199: */
200:
201: class VParserMethodFrame: public VMethodFrame {
202: protected:
203: HashString<Value*> my;
204:
205: public: // Value
1.20 paf 206:
1.114 moko 207: /// VParserMethodFrame: $result | parent get_string(=accumulated fstring)
1.109 moko 208: override const String* get_string() {
1.20 paf 209: // check the $result value
1.46 paf 210: Value* result=get_result_variable();
1.20 paf 211: // if we have one, return it's string value, else return as usual: accumulated fstring or fvalue
212: return result ? result->get_string() : WContext::get_string();
213: }
1.114 moko 214:
215: /// VParserMethodFrame: my or self_transparent or $caller
1.109 moko 216: override Value* get_element(const String& aname) {
1.103 moko 217: if(SYMBOLS_EQ(aname,CALLER_SYMBOL))
1.118 moko 218: return get_caller_wrapper();
1.42 paf 219:
1.103 moko 220: if(SYMBOLS_EQ(aname,SELF_SYMBOL))
1.67 misha 221: return &self();
222:
1.114 moko 223: if(Value* result=my.get(aname))
1.66 misha 224: return result;
225:
1.114 moko 226: if(Value* result=self().get_element(aname))
1.66 misha 227: return result;
1.40 paf 228:
229: return 0;
1.1 paf 230: }
231:
1.114 moko 232: /// VParserMethodFrame: my or self_transparent
1.94 moko 233: override const VJunction* put_element(const String& aname, Value* avalue) {
1.114 moko 234: if(my.put_replaced(aname, avalue))
235: return PUT_ELEMENT_REPLACED_ELEMENT;
236: return self().put_element(aname, avalue);
1.64 misha 237: }
238:
1.114 moko 239: public: // WContext
240:
241: /// VParserMethodFrame: skip write when RO_USE_RESULT
1.112 moko 242: override void write(const String& astring) {
1.79 misha 243: #ifdef OPTIMIZE_RESULT
1.87 moko 244: switch (method.result_optimization){
1.97 moko 245: case Method::RO_USE_RESULT:
1.79 misha 246: return;
247: case Method::RO_UNKNOWN:
248: if(get_result_variable()){
1.87 moko 249: ((Method *)&method)->result_optimization=Method::RO_USE_RESULT;
1.79 misha 250: return;
251: }
1.97 moko 252: case Method::RO_USE_WCONTEXT: break;
1.69 misha 253: }
1.79 misha 254: #endif
1.112 moko 255: WContext::write(astring);
1.69 misha 256: }
257:
1.114 moko 258: override void write(Value& avalue) {
259: WContext::write(avalue);
1.64 misha 260: }
261:
1.119 moko 262: override ValueRef result() {
1.114 moko 263: // check the $result value
264: Value* result_value=get_result_variable();
265: // if we have one, return it, else return as usual: accumulated fstring or fvalue
266: if(result_value)
1.120 ! moko 267: return result_value;
1.79 misha 268: #ifdef OPTIMIZE_RESULT
1.114 moko 269: if(method.result_optimization==Method::RO_USE_RESULT)
1.120 ! moko 270: return VVoid::get();
1.114 moko 271: ((Method *)&method)->result_optimization=Method::RO_USE_WCONTEXT;
1.79 misha 272: #ifdef OPTIMIZE_CALL // nested as CO_WITHOUT_WCONTEXT assumes that $result not used
1.114 moko 273: ((Method *)&method)->call_optimization=Method::CO_WITHOUT_WCONTEXT;
1.79 misha 274: #endif
275: #endif
276: return WContext::result();
1.1 paf 277: }
278:
279: public: // usage
280:
1.114 moko 281: VParserMethodFrame(const Method& amethod, VMethodFrame *acaller, Value& aself);
1.1 paf 282:
1.114 moko 283: void store_params(Value **params, size_t count) {
284: size_t param_count=method.params_count;
285: size_t i=0;
1.25 paf 286:
1.114 moko 287: if(count>param_count){
288: if(method.extra_params){
289: for(; i<param_count; i++) {
290: const String& fname=*(*method.params_names)[i];
291: set_my_variable(fname, *params[i]);
292: }
1.75 misha 293:
1.114 moko 294: VHash& vargs=*new VHash();
295: HashStringValue& args = vargs.hash();
1.1 paf 296:
1.114 moko 297: for(; i<count; i++) {
298: args.put(format(args.count(), 0), params[i]);
299: }
1.77 misha 300:
1.114 moko 301: set_my_variable(*method.extra_params, vargs);
302: return;
303: } else
304: throw Exception(PARSER_RUNTIME, 0, "method of %s accepts maximum %d parameter(s) (%d present)", self().type(), param_count, count);
305: }
1.86 misha 306:
1.114 moko 307: for(; i<count; i++) {
308: const String& fname=*(*method.params_names)[i];
309: set_my_variable(fname, *params[i]);
310: }
1.78 misha 311:
1.114 moko 312: for(; i<param_count; i++) {
313: const String& fname=*(*method.params_names)[i];
314: my.put(fname, VVoid::get());
315: }
1.1 paf 316: }
317:
1.78 misha 318: void empty_params(){
1.114 moko 319: size_t param_count=method.params_count;
320: if(param_count>0){
321: my.put(*(*method.params_names)[0], VString::empty());
322: for(size_t i=1; i<param_count; i++)
323: my.put(*(*method.params_names)[i], VVoid::get());
1.78 misha 324: }
325: }
326:
1.114 moko 327: void call(Request &r);
1.18 paf 328:
1.63 misha 329: protected:
1.18 paf 330:
1.46 paf 331: void set_my_variable(const String& fname, Value& value) {
1.114 moko 332: my.put(fname, &value); // remember param
1.25 paf 333: }
334:
1.46 paf 335: Value* get_result_variable();
1.1 paf 336:
1.118 moko 337: Value* get_caller_wrapper();
338:
1.114 moko 339: };
340:
341:
342: class VLocalParserMethodFrame: public VParserMethodFrame {
343: public: // Value
344:
345: override const VJunction* put_element(const String& aname, Value* avalue){
346: set_my_variable(aname, *avalue);
347: return PUT_ELEMENT_REPLACED_ELEMENT;
348: }
349:
350: public: // usage
351:
352: VLocalParserMethodFrame(const Method& amethod, VMethodFrame *acaller, Value& aself) : VParserMethodFrame(amethod, acaller, aself) {}
1.1 paf 353:
1.41 paf 354: };
355:
1.114 moko 356:
357: template<typename Parent> class VExpressionFrame: public Parent {
1.113 moko 358: public:
1.114 moko 359: VExpressionFrame(const Method& amethod, VMethodFrame *acaller, Value& aself) : Parent(amethod, acaller, aself) {}
1.113 moko 360:
1.117 moko 361: /// in expressions only strings are written as strings
1.113 moko 362: override void write_as_string(Value& avalue) {
1.117 moko 363: if(avalue.is_string())
364: Parent::write(*avalue.get_string());
365: else
366: Parent::write(avalue);
1.113 moko 367: }
368: };
369:
370:
1.114 moko 371: template<typename Parent> class VConstructorFrame: public Parent {
1.85 misha 372: public:
1.114 moko 373: VConstructorFrame(const Method& amethod, VMethodFrame *acaller, Value& aself) : Parent(amethod, acaller, aself) {
1.87 moko 374: // prevent non-string writes for better error reporting [constructors are not expected to return anything]
375: VMethodFrame::write(aself);
376: }
1.85 misha 377:
1.113 moko 378: override void write(const String& /*astring*/) {}
1.85 misha 379: };
380:
1.114 moko 381:
382: #define METHOD_FRAME_ACTION(method, caller, self, action) \
383: if((method).native_code){ \
384: VNativeMethodFrame frame(method, caller, self); \
385: action; \
386: } else { \
387: if((method).all_vars_local){ \
388: VLocalParserMethodFrame frame(method, caller, self); \
389: action; \
390: } else { \
391: VParserMethodFrame frame(method, caller, self); \
392: action; \
393: } \
394: }
395:
396: #define EXPRESSION_FRAME_ACTION(method, caller, self, action) \
397: if((method).native_code){ \
398: VExpressionFrame<VNativeMethodFrame> frame(method, caller, self); \
399: action; \
400: } else { \
401: if((method).all_vars_local){ \
402: VExpressionFrame<VLocalParserMethodFrame> frame(method, caller, self); \
403: action; \
404: } else { \
405: VExpressionFrame<VParserMethodFrame> frame(method, caller, self); \
406: action; \
407: } \
408: }
409:
410: #define CONSTRUCTOR_FRAME_ACTION(method, caller, self, action) \
411: if((method).native_code){ \
412: VConstructorFrame<VNativeMethodFrame> frame(method, caller, self); \
413: action; \
414: } else { \
415: if((method).all_vars_local){ \
416: VConstructorFrame<VLocalParserMethodFrame> frame(method, caller, self); \
417: action; \
418: } else { \
419: VConstructorFrame<VParserMethodFrame> frame(method, caller, self); \
420: action; \
421: } \
422: }
423:
1.1 paf 424: #endif
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