Annotation of parser3/src/types/pa_vmethod_frame.h, revision 1.78
1.3 paf 1: /** @file
1.5 paf 2: Parser: @b method_frame write context
1.3 paf 3:
1.68 misha 4: Copyright (c) 2001-2009 ArtLebedev Group (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:
1.78 ! misha 11: static const char * const IDENT_VMETHOD_FRAME_H="$Date: 2009-04-29 03:27:08 $";
1.1 paf 12:
13: #include "pa_wcontext.h"
1.12 parser 14: #include "pa_vvoid.h"
1.1 paf 15: #include "pa_vjunction.h"
16:
1.40 paf 17: // defines
18:
1.42 paf 19: #define CALLER_ELEMENT_NAME "caller"
20: #define SELF_ELEMENT_NAME "self"
1.50 paf 21: #define RESULT_VAR_NAME "result"
1.40 paf 22:
1.46 paf 23: // forwards
24:
25: class Request;
26:
27: /**
28: @b method parameters passed in this array.
29: contains handy typecast ad junction/not junction ensurers
30:
31: */
1.78 ! misha 32: class MethodParams {
1.46 paf 33: public:
1.78 ! misha 34: MethodParams() : felements(0), fused(0){}
! 35:
1.77 misha 36: void store_params(Value **params, size_t count){
1.78 ! misha 37: felements=params;
1.77 misha 38: fused=count;
39: }
40:
1.78 ! misha 41: inline size_t count() const { return fused; }
! 42:
! 43: inline Value *get(size_t index) const {
! 44: assert(index<count());
! 45: return felements[index];
! 46: }
! 47:
1.77 misha 48: inline Value& operator[] (size_t index) { return *get(index); }
1.46 paf 49:
50: Value& last() { return *get(count()-1); }
51:
52: /// handy is-value-a-junction ensurer
53: Value& as_junction(int index, const char* msg) {
1.56 paf 54: Value* value=get(index);
55: return as_junction(value, msg, index);
56: }
57: /// handy is-value-a-junction ensurer
58: Value& as_junction(Value* value, const char* msg, int index) {
59: return get_as(value, true, msg, index);
1.46 paf 60: }
61: /// handy value-is-not-a-junction ensurer
62: Value& as_no_junction(int index, const char* msg) {
1.56 paf 63: Value* value=get(index);
64: return as_no_junction(value, msg, index);
65: }
66: /// handy value-is-not-a-junction ensurer
67: Value& as_no_junction(Value* value, const char* msg, int index) {
68: return get_as(value, false, msg, index);
1.46 paf 69: }
1.62 misha 70: /// handy is-value-a-junction ensurer or can be auto-processed
71: Value& as_expression(int index, const char* msg) {
72: Value* value=get(index);
73: if(value->is_evaluated_expr()){
74: return *value;
75: } else {
76: return get_as(value, true, msg, index);
77: }
78: }
1.46 paf 79: /// handy expression auto-processing to double
80: double as_double(int index, const char* msg, Request& r) {
1.56 paf 81: Value* value=get(index);
1.60 paf 82: if(!value->is_evaluated_expr())
1.57 paf 83: value=&get_processed(value, msg, index, r);
84: return value->as_double();
1.46 paf 85: }
86: /// handy expression auto-processing to int
87: int as_int(int index, const char* msg, Request& r) {
1.56 paf 88: Value* value=get(index);
1.60 paf 89: if(!value->is_evaluated_expr())
1.57 paf 90: value=&get_processed(value, msg, index, r);
91: return value->as_int();
1.46 paf 92: }
93: /// handy expression auto-processing to bool
94: bool as_bool(int index, const char* msg, Request& r) {
1.56 paf 95: Value* value=get(index);
1.60 paf 96: if(!value->is_evaluated_expr())
1.59 paf 97: value=&get_processed(value, msg, index, r);
98: return value->as_bool();
1.46 paf 99: }
100: /// handy string ensurer
101: const String& as_string(int index, const char* msg) {
102: return as_no_junction(index, msg).as_string();
103: }
104: private:
105:
1.78 ! misha 106: Value **felements;
! 107: size_t fused;
! 108:
1.46 paf 109: /// handy value-is/not-a-junction ensurer
1.56 paf 110: Value& get_as(Value* value, bool as_junction, const char* msg, int index) {
111: if((value->get_junction()!=0) ^ as_junction)
1.61 misha 112: throw Exception(PARSER_RUNTIME,
1.46 paf 113: 0,
114: "%s (parameter #%d)", msg, 1+index);
115:
1.56 paf 116: return *value;
1.46 paf 117: }
118:
1.56 paf 119: Value& get_processed(Value* value, const char* msg, int index, Request& r);
1.46 paf 120:
121: };
122:
1.4 paf 123: /** Method frame write context
124: accepts values written by method code
125: also handles method parameters and local variables
1.3 paf 126: */
1.46 paf 127: class VMethodFrame: public WContext {
1.63 misha 128: protected:
1.46 paf 129: VMethodFrame *fcaller;
130:
1.72 misha 131: HashStringValue* my; /*OR*/ MethodParams fnumbered_params;
1.46 paf 132: Value* fself;
133:
1.64 misha 134: typedef const VJunction* (VMethodFrame::*put_element_t)(const String& aname, Value* avalue);
135: put_element_t put_element_impl;
1.46 paf 136:
1.1 paf 137: public: // Value
138:
1.46 paf 139: override const char* type() const { return "method_frame"; }
1.20 paf 140:
141: /// VMethodFrame: $result | parent get_string(=accumulated fstring)
1.46 paf 142: override const String* get_string() {
1.20 paf 143: // check the $result value
1.46 paf 144: Value* result=get_result_variable();
1.20 paf 145: // if we have one, return it's string value, else return as usual: accumulated fstring or fvalue
146: return result ? result->get_string() : WContext::get_string();
147: }
148:
1.40 paf 149: /// VMethodFrame: my or self_transparent or $caller
1.51 paf 150: override Value* get_element(const String& aname, Value& /*aself*/, bool looking_up) {
1.42 paf 151: if(aname==CALLER_ELEMENT_NAME)
1.40 paf 152: return caller();
1.42 paf 153:
1.67 misha 154: if(aname==SELF_ELEMENT_NAME)
155: return &self();
156:
1.66 misha 157: Value* result;
158: if(my && (result=my->get(aname)))
159: return result;
160:
161: if(result=self().get_element(aname, self(), looking_up))
162: return result;
1.40 paf 163:
164: return 0;
1.1 paf 165: }
166:
1.4 paf 167: /// VMethodFrame: self_transparent
1.46 paf 168: override VStateless_class* get_class() { return self().get_class(); }
1.44 paf 169:
170: /// VMethodFrame: self_transparent
1.46 paf 171: override Value* base() { return self().base(); }
1.1 paf 172:
1.64 misha 173: /// VMethodFrame: my or self_transparent
174: override const VJunction* put_element(Value& /*aself*/, const String& aname, Value* avalue, bool /*areplace*/) {
175: return (this->*put_element_impl)(aname, avalue);
176: }
177:
1.69 misha 178: /// VMethodFrame: appends a fstring to result
179: override void write(const String& astring, String::Language alang) {
1.74 misha 180: if(!junction.method->allways_use_result){
1.73 misha 181: if(!get_result_variable()){
182: WContext::write(astring, alang);
183: } else {
1.74 misha 184: ((Method *)junction.method)->allways_use_result=true;
1.73 misha 185: }
1.69 misha 186: }
187: }
188:
1.64 misha 189: private:
190:
191: const VJunction* put_element_local(const String& aname, Value* avalue){
192: set_my_variable(aname, *avalue);
193: return PUT_ELEMENT_REPLACED_ELEMENT;
194: }
195:
196: const VJunction* put_element_global(const String& aname, Value* avalue){
197: if(my && my->put_replaced(aname, avalue))
198: return PUT_ELEMENT_REPLACED_ELEMENT;
199: return self().put_element(self(), aname, avalue, false/*=always, areplace*/);
200: }
201:
1.30 paf 202: public: // WContext
1.1 paf 203:
1.46 paf 204: override StringOrValue result() {
1.1 paf 205: // check the $result value
1.46 paf 206: Value* result_value=get_result_variable();
1.1 paf 207: // if we have one, return it, else return as usual: accumulated fstring or fvalue
1.52 paf 208: return result_value ? StringOrValue(*result_value) : WContext::result();
1.1 paf 209: }
210:
1.46 paf 211: void write(Value& avalue, String::Language alang) {
212: WContext::write(avalue, alang);
213: }
214:
1.1 paf 215: public: // usage
216:
1.46 paf 217: VMethodFrame(
1.40 paf 218: const Junction& ajunction/*info: always method-junction*/,
1.46 paf 219: VMethodFrame *acaller);
1.1 paf 220:
1.40 paf 221: VMethodFrame *caller() { return fcaller; }
1.25 paf 222:
1.76 misha 223: #ifdef USE_DESTRUCTORS
1.75 misha 224: ~VMethodFrame(){
225: if(my){
226: delete my;
227: }
228: }
1.76 misha 229: #endif
1.75 misha 230:
1.38 paf 231: void set_self(Value& aself) { fself=&aself; }
1.41 paf 232: /// we sure that someone already set our self with VMethodFrame::set_self(Value&)
233: Value& self() { return *fself; }
1.1 paf 234:
1.77 misha 235: size_t method_params_count() {
1.27 paf 236: const Method& method=*junction.method;
1.77 misha 237: return method.params_names ? method.params_names->count():0;
1.27 paf 238: }
1.77 misha 239:
240: void store_params(Value **params, size_t count) {
1.1 paf 241: const Method& method=*junction.method;
1.46 paf 242: size_t max_params=
1.1 paf 243: method.max_numbered_params_count?method.max_numbered_params_count:
1.46 paf 244: method.params_names?method.params_names->count():
1.1 paf 245: 0;
1.77 misha 246:
247: if(count>max_params)
1.61 misha 248: throw Exception(PARSER_RUNTIME,
1.46 paf 249: 0, //&name(),
1.7 paf 250: "method of %s (%s) accepts maximum %d parameter(s)",
1.38 paf 251: junction.self.get_class()->name_cstr(),
252: junction.self.type(),
1.1 paf 253: max_params);
1.78 ! misha 254:
! 255: if(method.params_names) {
1.77 misha 256: size_t i=0;
257:
258: for (; i<count; i++){
259: const String& fname=*(*method.params_names)[i];
260: set_my_variable(fname, *params[i]);
261: }
262:
1.46 paf 263: size_t param_count=method.params_names->count();
1.77 misha 264: for(; i<param_count; i++) {
265: const String& fname=*(*method.params_names)[i];
1.68 misha 266: my->put(fname, VVoid::get());
1.1 paf 267: }
1.77 misha 268: } else {
269: fnumbered_params.store_params(params,count);
1.46 paf 270: }
1.1 paf 271: }
272:
1.78 ! misha 273: void empty_params(){
! 274: const Method& method=*junction.method;
! 275: if(method.params_names){
! 276: size_t param_count=method.params_names->count();
! 277: for(size_t i=0; i<param_count; i++) {
! 278: const String& fname=*(*method.params_names)[i];
! 279: my->put(fname, VVoid::get());
! 280: }
! 281: }
! 282: }
! 283:
1.72 misha 284: MethodParams* numbered_params() { return &fnumbered_params; }
1.18 paf 285:
1.63 misha 286: protected:
1.18 paf 287:
1.46 paf 288: void set_my_variable(const String& fname, Value& value) {
289: my->put(fname, &value); // remember param
1.25 paf 290: }
291:
1.46 paf 292: Value* get_result_variable();
1.1 paf 293:
294: public:
295:
296: const Junction& junction;
297:
1.41 paf 298: };
299:
300: /// Auto-object used for temporary changing VMethod_frame::fself.
301: class Temp_method_frame_self {
302: VMethodFrame& fmethod_frame;
1.46 paf 303: Value* saved_self;
1.41 paf 304: public:
305: Temp_method_frame_self(VMethodFrame& amethod_frame, Value& aself) :
306: fmethod_frame(amethod_frame),
1.46 paf 307: saved_self(&amethod_frame.self()) {
1.41 paf 308: fmethod_frame.set_self(aself);
309: }
310: ~Temp_method_frame_self() {
1.46 paf 311: fmethod_frame.set_self(*saved_self);
1.41 paf 312: }
1.1 paf 313: };
314:
315: #endif
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