Annotation of parser3/src/types/pa_vmethod_frame.h, revision 1.107
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:
1.107 ! moko 11: #define IDENT_PA_VMETHOD_FRAME_H "$Id: pa_vmethod_frame.h,v 1.106 2016/10/04 21:20:41 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:
1.78 misha 29: MethodParams() : felements(0), fused(0){}
30:
1.82 misha 31: #ifdef USE_DESTRUCTORS
32: ~MethodParams(){
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:
1.77 misha 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:
49: inline Value *get(size_t index) const {
50: assert(index<count());
51: return felements[index];
52: }
53:
1.77 misha 54: inline Value& operator[] (size_t index) { return *get(index); }
1.46 paf 55:
56: Value& last() { return *get(count()-1); }
57:
58: /// handy is-value-a-junction ensurer
59: Value& as_junction(int index, const char* msg) {
1.107 ! moko 60: Value& value=*get(index);
! 61: if(!value.get_junction())
! 62: throw Exception(PARSER_RUNTIME, 0, "%s (parameter #%d)", msg, 1+index);
! 63: return value;
1.46 paf 64: }
1.107 ! moko 65:
1.46 paf 66: /// handy value-is-not-a-junction ensurer
67: Value& as_no_junction(int index, const char* msg) {
1.107 ! moko 68: Value& value=*get(index);
! 69: if(value.get_junction())
! 70: throw Exception(PARSER_RUNTIME, 0, "%s (parameter #%d)", msg, 1+index);
! 71: return value;
1.46 paf 72: }
1.107 ! moko 73:
1.62 misha 74: /// handy is-value-a-junction ensurer or can be auto-processed
75: Value& as_expression(int index, const char* msg) {
1.107 ! moko 76: Value& value=*get(index);
! 77: if(value.is_evaluated_expr()){
! 78: return value;
1.62 misha 79: } else {
1.107 ! moko 80: if(!value.get_junction())
! 81: throw Exception(PARSER_RUNTIME, 0, "%s (parameter #%d)", msg, 1+index);
! 82: return value;
1.62 misha 83: }
84: }
1.107 ! moko 85:
1.46 paf 86: /// handy expression auto-processing to double
1.107 ! moko 87: double as_double(int index, const char* msg, Request& r) {
! 88: Value& value=*get(index);
! 89: if(value.is_evaluated_expr())
! 90: return value.as_double();
! 91: return get_processed(value, msg, index, r).as_double();
1.46 paf 92: }
1.107 ! moko 93:
1.46 paf 94: /// handy expression auto-processing to int
1.107 ! moko 95: int as_int(int index, const char* msg, Request& r) {
! 96: Value& value=*get(index);
! 97: if(value.is_evaluated_expr())
! 98: return value.as_int();
! 99: return get_processed(value, msg, index, r).as_int();
1.46 paf 100: }
1.107 ! moko 101:
1.46 paf 102: /// handy expression auto-processing to bool
1.107 ! moko 103: bool as_bool(int index, const char* msg, Request& r) {
! 104: Value& value=*get(index);
! 105: if(value.is_evaluated_expr())
! 106: return value.as_bool();
! 107: return get_processed(value, msg, index, r).as_bool();
1.46 paf 108: }
1.107 ! moko 109:
1.46 paf 110: /// handy string ensurer
111: const String& as_string(int index, const char* msg) {
112: return as_no_junction(index, msg).as_string();
113: }
1.107 ! moko 114:
1.93 misha 115: /// handy hash ensurers
116: HashStringValue* as_hash(int index, const char* name=0);
1.107 ! moko 117:
1.93 misha 118: /// handy table ensurer
119: Table* as_table(int index, const char* name=0);
120:
1.46 paf 121: private:
122:
1.78 misha 123: Value **felements;
124: size_t fused;
125:
1.107 ! moko 126: Value& get_processed(Value& value, const char* msg, int index, Request& r);
1.46 paf 127:
128: };
129:
1.4 paf 130: /** Method frame write context
131: accepts values written by method code
132: also handles method parameters and local variables
1.3 paf 133: */
1.46 paf 134: class VMethodFrame: public WContext {
1.63 misha 135: protected:
1.46 paf 136: VMethodFrame *fcaller;
137:
1.83 misha 138: HashString<Value*>* my; /*OR*/ MethodParams fnumbered_params;
1.87 moko 139: Value& fself;
1.46 paf 140:
1.64 misha 141: typedef const VJunction* (VMethodFrame::*put_element_t)(const String& aname, Value* avalue);
142: put_element_t put_element_impl;
1.46 paf 143:
1.1 paf 144: public: // Value
145:
1.46 paf 146: override const char* type() const { return "method_frame"; }
1.20 paf 147:
148: /// VMethodFrame: $result | parent get_string(=accumulated fstring)
1.46 paf 149: override const String* get_string() {
1.20 paf 150: // check the $result value
1.46 paf 151: Value* result=get_result_variable();
1.20 paf 152: // if we have one, return it's string value, else return as usual: accumulated fstring or fvalue
153: return result ? result->get_string() : WContext::get_string();
154: }
155:
1.40 paf 156: /// VMethodFrame: my or self_transparent or $caller
1.84 misha 157: override Value* get_element(const String& aname) {
1.103 moko 158: if(SYMBOLS_EQ(aname,CALLER_SYMBOL))
1.40 paf 159: return caller();
1.42 paf 160:
1.103 moko 161: if(SYMBOLS_EQ(aname,SELF_SYMBOL))
1.67 misha 162: return &self();
163:
1.66 misha 164: Value* result;
165: if(my && (result=my->get(aname)))
166: return result;
167:
1.84 misha 168: if(result=self().get_element(aname))
1.66 misha 169: return result;
1.40 paf 170:
171: return 0;
1.1 paf 172: }
173:
1.4 paf 174: /// VMethodFrame: self_transparent
1.46 paf 175: override VStateless_class* get_class() { return self().get_class(); }
1.44 paf 176:
177: /// VMethodFrame: self_transparent
1.85 misha 178: override VStateless_class* base() { return self().base(); }
1.1 paf 179:
1.64 misha 180: /// VMethodFrame: my or self_transparent
1.94 moko 181: override const VJunction* put_element(const String& aname, Value* avalue) {
1.64 misha 182: return (this->*put_element_impl)(aname, avalue);
183: }
184:
1.69 misha 185: /// VMethodFrame: appends a fstring to result
186: override void write(const String& astring, String::Language alang) {
1.79 misha 187: #ifdef OPTIMIZE_RESULT
1.87 moko 188: switch (method.result_optimization){
1.97 moko 189: case Method::RO_USE_RESULT:
1.79 misha 190: return;
191: case Method::RO_UNKNOWN:
192: if(get_result_variable()){
1.87 moko 193: ((Method *)&method)->result_optimization=Method::RO_USE_RESULT;
1.79 misha 194: return;
195: }
1.97 moko 196: case Method::RO_USE_WCONTEXT: break;
1.69 misha 197: }
1.79 misha 198: #endif
199: WContext::write(astring, alang);
1.69 misha 200: }
201:
1.64 misha 202: private:
203:
204: const VJunction* put_element_local(const String& aname, Value* avalue){
205: set_my_variable(aname, *avalue);
206: return PUT_ELEMENT_REPLACED_ELEMENT;
207: }
208:
209: const VJunction* put_element_global(const String& aname, Value* avalue){
210: if(my && my->put_replaced(aname, avalue))
211: return PUT_ELEMENT_REPLACED_ELEMENT;
1.94 moko 212: return self().put_element(aname, avalue);
1.64 misha 213: }
214:
1.30 paf 215: public: // WContext
1.1 paf 216:
1.105 moko 217: override Value& result() {
1.80 misha 218: if(my){
219: // check the $result value
220: Value* result_value=get_result_variable();
221: // if we have one, return it, else return as usual: accumulated fstring or fvalue
222: if(result_value)
1.105 moko 223: return *result_value;
1.79 misha 224: #ifdef OPTIMIZE_RESULT
1.87 moko 225: if(method.result_optimization==Method::RO_USE_RESULT)
1.105 moko 226: return *VVoid::get();
1.87 moko 227: ((Method *)&method)->result_optimization=Method::RO_USE_WCONTEXT;
1.79 misha 228: #ifdef OPTIMIZE_CALL // nested as CO_WITHOUT_WCONTEXT assumes that $result not used
1.87 moko 229: ((Method *)&method)->call_optimization=Method::CO_WITHOUT_WCONTEXT;
1.79 misha 230: #endif
231: #endif
1.80 misha 232: }
1.79 misha 233: return WContext::result();
1.1 paf 234: }
235:
1.85 misha 236: override void write(Value& avalue) {
237: WContext::write(avalue);
1.46 paf 238: }
239:
1.1 paf 240: public: // usage
241:
1.87 moko 242: VMethodFrame(const Method& amethod, VMethodFrame *acaller, Value& aself);
1.1 paf 243:
1.40 paf 244: VMethodFrame *caller() { return fcaller; }
1.25 paf 245:
1.76 misha 246: #ifdef USE_DESTRUCTORS
1.75 misha 247: ~VMethodFrame(){
248: if(my){
249: delete my;
250: }
251: }
1.76 misha 252: #endif
1.75 misha 253:
1.87 moko 254: Value& self() { return fself; }
1.1 paf 255:
1.77 misha 256: size_t method_params_count() {
257: return method.params_names ? method.params_names->count():0;
1.27 paf 258: }
1.77 misha 259:
260: void store_params(Value **params, size_t count) {
1.92 moko 261: if(my) {
262: size_t param_count=method.params_names ? method.params_names->count():0;
1.89 moko 263: size_t i=0;
264:
265: if(count>param_count){
266: if(method.extra_params){
267: for(; i<param_count; i++) {
268: const String& fname=*(*method.params_names)[i];
269: set_my_variable(fname, *params[i]);
270: }
271:
272: VHash& vargs=*new VHash();
273: HashStringValue& args = vargs.hash();
274:
275: for(; i<count; i++) {
276: args.put(format(args.count(), 0), params[i]);
277: }
1.86 misha 278:
1.89 moko 279: set_my_variable(*method.extra_params, vargs);
280: return;
281: } else
1.86 misha 282: throw Exception(PARSER_RUNTIME,
283: 0, //&name(),
1.99 moko 284: "method of %s accepts maximum %d parameter(s) (%d present)",
1.87 moko 285: self().type(),
1.86 misha 286: param_count,
287: count);
1.89 moko 288: }
1.78 misha 289:
1.86 misha 290: for(; i<count; i++) {
1.77 misha 291: const String& fname=*(*method.params_names)[i];
292: set_my_variable(fname, *params[i]);
293: }
294:
295: for(; i<param_count; i++) {
296: const String& fname=*(*method.params_names)[i];
1.68 misha 297: my->put(fname, VVoid::get());
1.1 paf 298: }
1.86 misha 299: } else
1.77 misha 300: fnumbered_params.store_params(params,count);
1.1 paf 301: }
302:
1.78 misha 303: void empty_params(){
304: if(method.params_names){
305: size_t param_count=method.params_names->count();
1.91 moko 306: if(param_count>0){
1.104 moko 307: my->put(*(*method.params_names)[0], VString::empty());
308: for(size_t i=1; i<param_count; i++)
309: my->put(*(*method.params_names)[i], VVoid::get());
1.78 misha 310: }
311: }
312: }
313:
1.72 misha 314: MethodParams* numbered_params() { return &fnumbered_params; }
1.18 paf 315:
1.63 misha 316: protected:
1.18 paf 317:
1.46 paf 318: void set_my_variable(const String& fname, Value& value) {
319: my->put(fname, &value); // remember param
1.25 paf 320: }
321:
1.46 paf 322: Value* get_result_variable();
1.1 paf 323:
324: public:
325:
1.87 moko 326: const Method& method;
1.1 paf 327:
1.41 paf 328: };
329:
1.85 misha 330: class VConstructorFrame: public VMethodFrame {
331: public:
1.87 moko 332: VConstructorFrame(const Method& amethod, VMethodFrame *acaller, Value& aself) : VMethodFrame(amethod, acaller, aself) {
333: // prevent non-string writes for better error reporting [constructors are not expected to return anything]
334: VMethodFrame::write(aself);
335: }
1.85 misha 336:
337: override void write(const String& /*astring*/, String::Language /*alang*/) {}
338: };
339:
1.1 paf 340: #endif
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