Annotation of parser3/src/types/pa_vmethod_frame.h, revision 1.109
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:
1.109 ! moko 11: #define IDENT_PA_VMETHOD_FRAME_H "$Id: pa_vmethod_frame.h,v 1.108 2016/10/06 19:41:36 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
25:
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)
1.82 misha 37: delete *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);
1.107 moko 59: if(!value.get_junction())
60: throw Exception(PARSER_RUNTIME, 0, "%s (parameter #%d)", msg, 1+index);
61: return value;
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);
1.107 moko 67: if(value.get_junction())
68: throw Exception(PARSER_RUNTIME, 0, "%s (parameter #%d)", msg, 1+index);
69: return value;
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);
1.107 moko 75: if(value.is_evaluated_expr()){
76: return value;
1.62 misha 77: } else {
1.107 moko 78: if(!value.get_junction())
79: throw Exception(PARSER_RUNTIME, 0, "%s (parameter #%d)", msg, 1+index);
80: return value;
1.62 misha 81: }
82: }
1.107 moko 83:
1.46 paf 84: /// handy expression auto-processing to double
1.107 moko 85: double as_double(int index, const char* msg, Request& r) {
1.108 moko 86: Value& value=get(index);
1.107 moko 87: if(value.is_evaluated_expr())
88: return value.as_double();
89: return get_processed(value, msg, index, r).as_double();
1.46 paf 90: }
1.107 moko 91:
1.46 paf 92: /// handy expression auto-processing to int
1.107 moko 93: int as_int(int index, const char* msg, Request& r) {
1.108 moko 94: Value& value=get(index);
1.107 moko 95: if(value.is_evaluated_expr())
96: return value.as_int();
97: return get_processed(value, msg, index, r).as_int();
1.46 paf 98: }
1.107 moko 99:
1.46 paf 100: /// handy expression auto-processing to bool
1.107 moko 101: bool as_bool(int index, const char* msg, Request& r) {
1.108 moko 102: Value& value=get(index);
1.107 moko 103: if(value.is_evaluated_expr())
104: return value.as_bool();
105: return get_processed(value, msg, index, r).as_bool();
1.46 paf 106: }
1.107 moko 107:
1.46 paf 108: /// handy string ensurer
1.109 ! moko 109: const String& as_string(int index, const char* msg) {
1.46 paf 110: return as_no_junction(index, msg).as_string();
111: }
1.107 moko 112:
1.93 misha 113: /// handy hash ensurers
114: HashStringValue* as_hash(int index, const char* name=0);
1.107 moko 115:
1.93 misha 116: /// handy table ensurer
117: Table* as_table(int index, const char* name=0);
118:
1.46 paf 119: private:
120:
1.78 misha 121: Value **felements;
122: size_t fused;
123:
1.107 moko 124: Value& get_processed(Value& value, const char* msg, int index, Request& r);
1.46 paf 125:
126: };
127:
1.4 paf 128: /** Method frame write context
129: accepts values written by method code
130: also handles method parameters and local variables
1.3 paf 131: */
1.46 paf 132: class VMethodFrame: public WContext {
1.63 misha 133: protected:
1.46 paf 134: VMethodFrame *fcaller;
135:
1.83 misha 136: HashString<Value*>* my; /*OR*/ MethodParams fnumbered_params;
1.87 moko 137: Value& fself;
1.46 paf 138:
1.64 misha 139: typedef const VJunction* (VMethodFrame::*put_element_t)(const String& aname, Value* avalue);
140: put_element_t put_element_impl;
1.46 paf 141:
1.1 paf 142: public: // Value
143:
1.46 paf 144: override const char* type() const { return "method_frame"; }
1.20 paf 145:
146: /// VMethodFrame: $result | parent get_string(=accumulated fstring)
1.109 ! moko 147: override const String* get_string() {
1.20 paf 148: // check the $result value
1.46 paf 149: Value* result=get_result_variable();
1.20 paf 150: // if we have one, return it's string value, else return as usual: accumulated fstring or fvalue
151: return result ? result->get_string() : WContext::get_string();
152: }
153:
1.40 paf 154: /// VMethodFrame: my or self_transparent or $caller
1.109 ! moko 155: override Value* get_element(const String& aname) {
1.103 moko 156: if(SYMBOLS_EQ(aname,CALLER_SYMBOL))
1.40 paf 157: return caller();
1.42 paf 158:
1.103 moko 159: if(SYMBOLS_EQ(aname,SELF_SYMBOL))
1.67 misha 160: return &self();
161:
1.66 misha 162: Value* result;
163: if(my && (result=my->get(aname)))
164: return result;
165:
1.84 misha 166: if(result=self().get_element(aname))
1.66 misha 167: return result;
1.40 paf 168:
169: return 0;
1.1 paf 170: }
171:
1.4 paf 172: /// VMethodFrame: self_transparent
1.46 paf 173: override VStateless_class* get_class() { return self().get_class(); }
1.44 paf 174:
175: /// VMethodFrame: self_transparent
1.85 misha 176: override VStateless_class* base() { return self().base(); }
1.1 paf 177:
1.64 misha 178: /// VMethodFrame: my or self_transparent
1.94 moko 179: override const VJunction* put_element(const String& aname, Value* avalue) {
1.64 misha 180: return (this->*put_element_impl)(aname, avalue);
181: }
182:
1.69 misha 183: /// VMethodFrame: appends a fstring to result
184: override void write(const String& astring, String::Language alang) {
1.79 misha 185: #ifdef OPTIMIZE_RESULT
1.87 moko 186: switch (method.result_optimization){
1.97 moko 187: case Method::RO_USE_RESULT:
1.79 misha 188: return;
189: case Method::RO_UNKNOWN:
190: if(get_result_variable()){
1.87 moko 191: ((Method *)&method)->result_optimization=Method::RO_USE_RESULT;
1.79 misha 192: return;
193: }
1.97 moko 194: case Method::RO_USE_WCONTEXT: break;
1.69 misha 195: }
1.79 misha 196: #endif
197: WContext::write(astring, alang);
1.69 misha 198: }
199:
1.64 misha 200: private:
201:
202: const VJunction* put_element_local(const String& aname, Value* avalue){
203: set_my_variable(aname, *avalue);
204: return PUT_ELEMENT_REPLACED_ELEMENT;
205: }
206:
207: const VJunction* put_element_global(const String& aname, Value* avalue){
208: if(my && my->put_replaced(aname, avalue))
209: return PUT_ELEMENT_REPLACED_ELEMENT;
1.94 moko 210: return self().put_element(aname, avalue);
1.64 misha 211: }
212:
1.30 paf 213: public: // WContext
1.1 paf 214:
1.105 moko 215: override Value& result() {
1.80 misha 216: if(my){
217: // check the $result value
218: Value* result_value=get_result_variable();
219: // if we have one, return it, else return as usual: accumulated fstring or fvalue
220: if(result_value)
1.105 moko 221: return *result_value;
1.79 misha 222: #ifdef OPTIMIZE_RESULT
1.87 moko 223: if(method.result_optimization==Method::RO_USE_RESULT)
1.105 moko 224: return *VVoid::get();
1.87 moko 225: ((Method *)&method)->result_optimization=Method::RO_USE_WCONTEXT;
1.79 misha 226: #ifdef OPTIMIZE_CALL // nested as CO_WITHOUT_WCONTEXT assumes that $result not used
1.87 moko 227: ((Method *)&method)->call_optimization=Method::CO_WITHOUT_WCONTEXT;
1.79 misha 228: #endif
229: #endif
1.80 misha 230: }
1.79 misha 231: return WContext::result();
1.1 paf 232: }
233:
1.85 misha 234: override void write(Value& avalue) {
235: WContext::write(avalue);
1.46 paf 236: }
237:
1.1 paf 238: public: // usage
239:
1.87 moko 240: VMethodFrame(const Method& amethod, VMethodFrame *acaller, Value& aself);
1.1 paf 241:
1.40 paf 242: VMethodFrame *caller() { return fcaller; }
1.25 paf 243:
1.76 misha 244: #ifdef USE_DESTRUCTORS
1.75 misha 245: ~VMethodFrame(){
246: if(my){
247: delete my;
248: }
249: }
1.76 misha 250: #endif
1.75 misha 251:
1.87 moko 252: Value& self() { return fself; }
1.1 paf 253:
1.77 misha 254: size_t method_params_count() {
255: return method.params_names ? method.params_names->count():0;
1.27 paf 256: }
1.77 misha 257:
258: void store_params(Value **params, size_t count) {
1.92 moko 259: if(my) {
260: size_t param_count=method.params_names ? method.params_names->count():0;
1.89 moko 261: size_t i=0;
262:
263: if(count>param_count){
264: if(method.extra_params){
265: for(; i<param_count; i++) {
266: const String& fname=*(*method.params_names)[i];
267: set_my_variable(fname, *params[i]);
268: }
269:
270: VHash& vargs=*new VHash();
271: HashStringValue& args = vargs.hash();
272:
273: for(; i<count; i++) {
274: args.put(format(args.count(), 0), params[i]);
275: }
1.86 misha 276:
1.89 moko 277: set_my_variable(*method.extra_params, vargs);
278: return;
279: } else
1.109 ! moko 280: throw Exception(PARSER_RUNTIME, 0, "method of %s accepts maximum %d parameter(s) (%d present)", self().type(), param_count, count);
1.89 moko 281: }
1.78 misha 282:
1.86 misha 283: for(; i<count; i++) {
1.77 misha 284: const String& fname=*(*method.params_names)[i];
285: set_my_variable(fname, *params[i]);
286: }
287:
288: for(; i<param_count; i++) {
289: const String& fname=*(*method.params_names)[i];
1.68 misha 290: my->put(fname, VVoid::get());
1.1 paf 291: }
1.86 misha 292: } else
1.77 misha 293: fnumbered_params.store_params(params,count);
1.1 paf 294: }
295:
1.78 misha 296: void empty_params(){
297: if(method.params_names){
298: size_t param_count=method.params_names->count();
1.91 moko 299: if(param_count>0){
1.104 moko 300: my->put(*(*method.params_names)[0], VString::empty());
301: for(size_t i=1; i<param_count; i++)
302: my->put(*(*method.params_names)[i], VVoid::get());
1.78 misha 303: }
304: }
305: }
306:
1.72 misha 307: MethodParams* numbered_params() { return &fnumbered_params; }
1.18 paf 308:
1.63 misha 309: protected:
1.18 paf 310:
1.46 paf 311: void set_my_variable(const String& fname, Value& value) {
312: my->put(fname, &value); // remember param
1.25 paf 313: }
314:
1.46 paf 315: Value* get_result_variable();
1.1 paf 316:
317: public:
318:
1.87 moko 319: const Method& method;
1.1 paf 320:
1.41 paf 321: };
322:
1.85 misha 323: class VConstructorFrame: public VMethodFrame {
324: public:
1.87 moko 325: VConstructorFrame(const Method& amethod, VMethodFrame *acaller, Value& aself) : VMethodFrame(amethod, acaller, aself) {
326: // prevent non-string writes for better error reporting [constructors are not expected to return anything]
327: VMethodFrame::write(aself);
328: }
1.85 misha 329:
330: override void write(const String& /*astring*/, String::Language /*alang*/) {}
331: };
332:
1.1 paf 333: #endif
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