Annotation of parser3/src/types/pa_vmethod_frame.h, revision 1.88
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:
1.88 ! misha 11: static const char * const IDENT_VMETHOD_FRAME_H="$Date: 2010-08-01 14:49:33 $";
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"
1.81 misha 22: extern const String result_var_name, caller_element_name, self_element_name;
1.40 paf 23:
1.46 paf 24: // forwards
25:
26: class Request;
27:
28: /**
29: @b method parameters passed in this array.
30: contains handy typecast ad junction/not junction ensurers
31:
32: */
1.78 misha 33: class MethodParams {
1.46 paf 34: public:
1.78 misha 35: MethodParams() : felements(0), fused(0){}
36:
1.82 misha 37: #ifdef USE_DESTRUCTORS
38: ~MethodParams(){
39: Value **flast=felements+count();
40: for(Value **current=felements;current<flast;current++)
41: if ((*current)->get_junction()!=0)
42: delete *current;
43: }
44: #endif
45:
1.77 misha 46: void store_params(Value **params, size_t count){
1.78 misha 47: felements=params;
1.77 misha 48: fused=count;
49: }
50:
1.78 misha 51: inline size_t count() const { return fused; }
52:
53: inline Value *get(size_t index) const {
54: assert(index<count());
55: return felements[index];
56: }
57:
1.77 misha 58: inline Value& operator[] (size_t index) { return *get(index); }
1.46 paf 59:
60: Value& last() { return *get(count()-1); }
61:
62: /// handy is-value-a-junction ensurer
63: Value& as_junction(int index, const char* msg) {
1.56 paf 64: Value* value=get(index);
65: return as_junction(value, msg, index);
66: }
67: /// handy is-value-a-junction ensurer
68: Value& as_junction(Value* value, const char* msg, int index) {
69: return get_as(value, true, msg, index);
1.46 paf 70: }
71: /// handy value-is-not-a-junction ensurer
72: Value& as_no_junction(int index, const char* msg) {
1.56 paf 73: Value* value=get(index);
74: return as_no_junction(value, msg, index);
75: }
76: /// handy value-is-not-a-junction ensurer
77: Value& as_no_junction(Value* value, const char* msg, int index) {
78: return get_as(value, false, msg, index);
1.46 paf 79: }
1.62 misha 80: /// handy is-value-a-junction ensurer or can be auto-processed
81: Value& as_expression(int index, const char* msg) {
82: Value* value=get(index);
83: if(value->is_evaluated_expr()){
84: return *value;
85: } else {
86: return get_as(value, true, msg, index);
87: }
88: }
1.46 paf 89: /// handy expression auto-processing to double
90: double as_double(int index, const char* msg, Request& r) {
1.56 paf 91: Value* value=get(index);
1.60 paf 92: if(!value->is_evaluated_expr())
1.57 paf 93: value=&get_processed(value, msg, index, r);
94: return value->as_double();
1.46 paf 95: }
96: /// handy expression auto-processing to int
97: int as_int(int index, const char* msg, Request& r) {
1.56 paf 98: Value* value=get(index);
1.60 paf 99: if(!value->is_evaluated_expr())
1.57 paf 100: value=&get_processed(value, msg, index, r);
101: return value->as_int();
1.46 paf 102: }
103: /// handy expression auto-processing to bool
104: bool as_bool(int index, const char* msg, Request& r) {
1.56 paf 105: Value* value=get(index);
1.60 paf 106: if(!value->is_evaluated_expr())
1.59 paf 107: value=&get_processed(value, msg, index, r);
108: return value->as_bool();
1.46 paf 109: }
110: /// handy string ensurer
111: const String& as_string(int index, const char* msg) {
112: return as_no_junction(index, msg).as_string();
113: }
1.88 ! misha 114: /// handy hash ensurer
! 115: HashStringValue* as_hash(int index, const char* msg_no_junction=0, const char* msg_incorrect_type=0){
! 116: Value& voptions=as_no_junction(index, msg_no_junction ? msg_no_junction : OPTIONS_MUST_BE_HASH_NOT_CODE);
! 117: if(voptions.is_defined() && !voptions.is_string())
! 118: if(HashStringValue* options=voptions.get_hash())
! 119: return options;
! 120: else
! 121: throw Exception(PARSER_RUNTIME,
! 122: 0,
! 123: msg_incorrect_type ? msg_incorrect_type : OPTIONS_MUST_BE_HASH);
! 124: return 0;
! 125: }
1.46 paf 126: private:
127:
1.78 misha 128: Value **felements;
129: size_t fused;
130:
1.46 paf 131: /// handy value-is/not-a-junction ensurer
1.56 paf 132: Value& get_as(Value* value, bool as_junction, const char* msg, int index) {
133: if((value->get_junction()!=0) ^ as_junction)
1.61 misha 134: throw Exception(PARSER_RUNTIME,
1.46 paf 135: 0,
136: "%s (parameter #%d)", msg, 1+index);
137:
1.56 paf 138: return *value;
1.46 paf 139: }
140:
1.56 paf 141: Value& get_processed(Value* value, const char* msg, int index, Request& r);
1.46 paf 142:
143: };
144:
1.4 paf 145: /** Method frame write context
146: accepts values written by method code
147: also handles method parameters and local variables
1.3 paf 148: */
1.46 paf 149: class VMethodFrame: public WContext {
1.63 misha 150: protected:
1.46 paf 151: VMethodFrame *fcaller;
152:
1.83 misha 153: HashString<Value*>* my; /*OR*/ MethodParams fnumbered_params;
1.87 moko 154: Value& fself;
1.46 paf 155:
1.64 misha 156: typedef const VJunction* (VMethodFrame::*put_element_t)(const String& aname, Value* avalue);
157: put_element_t put_element_impl;
1.46 paf 158:
1.1 paf 159: public: // Value
160:
1.46 paf 161: override const char* type() const { return "method_frame"; }
1.20 paf 162:
163: /// VMethodFrame: $result | parent get_string(=accumulated fstring)
1.46 paf 164: override const String* get_string() {
1.20 paf 165: // check the $result value
1.46 paf 166: Value* result=get_result_variable();
1.20 paf 167: // if we have one, return it's string value, else return as usual: accumulated fstring or fvalue
168: return result ? result->get_string() : WContext::get_string();
169: }
170:
1.40 paf 171: /// VMethodFrame: my or self_transparent or $caller
1.84 misha 172: override Value* get_element(const String& aname) {
1.81 misha 173: if(aname==caller_element_name)
1.40 paf 174: return caller();
1.42 paf 175:
1.81 misha 176: if(aname==self_element_name)
1.67 misha 177: return &self();
178:
1.66 misha 179: Value* result;
180: if(my && (result=my->get(aname)))
181: return result;
182:
1.84 misha 183: if(result=self().get_element(aname))
1.66 misha 184: return result;
1.40 paf 185:
186: return 0;
1.1 paf 187: }
188:
1.4 paf 189: /// VMethodFrame: self_transparent
1.46 paf 190: override VStateless_class* get_class() { return self().get_class(); }
1.44 paf 191:
192: /// VMethodFrame: self_transparent
1.85 misha 193: override VStateless_class* base() { return self().base(); }
1.1 paf 194:
1.64 misha 195: /// VMethodFrame: my or self_transparent
1.84 misha 196: override const VJunction* put_element(const String& aname, Value* avalue, bool /*areplace*/) {
1.64 misha 197: return (this->*put_element_impl)(aname, avalue);
198: }
199:
1.69 misha 200: /// VMethodFrame: appends a fstring to result
201: override void write(const String& astring, String::Language alang) {
1.79 misha 202: #ifdef OPTIMIZE_RESULT
1.87 moko 203: switch (method.result_optimization){
1.79 misha 204: case Method::RO_USE_RESULT:
205: return;
206: case Method::RO_UNKNOWN:
207: if(get_result_variable()){
1.87 moko 208: ((Method *)&method)->result_optimization=Method::RO_USE_RESULT;
1.79 misha 209: return;
210: }
1.69 misha 211: }
1.79 misha 212: #endif
213: WContext::write(astring, alang);
1.69 misha 214: }
215:
1.64 misha 216: private:
217:
218: const VJunction* put_element_local(const String& aname, Value* avalue){
219: set_my_variable(aname, *avalue);
220: return PUT_ELEMENT_REPLACED_ELEMENT;
221: }
222:
223: const VJunction* put_element_global(const String& aname, Value* avalue){
224: if(my && my->put_replaced(aname, avalue))
225: return PUT_ELEMENT_REPLACED_ELEMENT;
1.84 misha 226: return self().put_element(aname, avalue, false/*=always, areplace*/);
1.64 misha 227: }
228:
1.30 paf 229: public: // WContext
1.1 paf 230:
1.46 paf 231: override StringOrValue result() {
1.80 misha 232: if(my){
233: // check the $result value
234: Value* result_value=get_result_variable();
235: // if we have one, return it, else return as usual: accumulated fstring or fvalue
236: if(result_value)
237: return StringOrValue(*result_value);
1.79 misha 238: #ifdef OPTIMIZE_RESULT
1.87 moko 239: if(method.result_optimization==Method::RO_USE_RESULT)
1.80 misha 240: return StringOrValue(*VVoid::get());
1.87 moko 241: ((Method *)&method)->result_optimization=Method::RO_USE_WCONTEXT;
1.79 misha 242: #ifdef OPTIMIZE_CALL // nested as CO_WITHOUT_WCONTEXT assumes that $result not used
1.87 moko 243: ((Method *)&method)->call_optimization=Method::CO_WITHOUT_WCONTEXT;
1.79 misha 244: #endif
245: #endif
1.80 misha 246: }
1.79 misha 247: return WContext::result();
1.1 paf 248: }
249:
1.85 misha 250: override void write(Value& avalue) {
251: WContext::write(avalue);
1.46 paf 252: }
253:
1.1 paf 254: public: // usage
255:
1.87 moko 256: VMethodFrame(const Method& amethod, VMethodFrame *acaller, Value& aself);
1.1 paf 257:
1.40 paf 258: VMethodFrame *caller() { return fcaller; }
1.25 paf 259:
1.76 misha 260: #ifdef USE_DESTRUCTORS
1.75 misha 261: ~VMethodFrame(){
262: if(my){
263: delete my;
264: }
265: }
1.76 misha 266: #endif
1.75 misha 267:
1.87 moko 268: Value& self() { return fself; }
1.1 paf 269:
1.77 misha 270: size_t method_params_count() {
271: return method.params_names ? method.params_names->count():0;
1.27 paf 272: }
1.77 misha 273:
274: void store_params(Value **params, size_t count) {
1.86 misha 275: if(method.params_names) {
276: size_t param_count=method.params_names->count();
277:
278: if(count>param_count)
279: throw Exception(PARSER_RUNTIME,
280: 0, //&name(),
281: "method of %s (%s) accepts maximum %d parameter(s) (%d present)",
1.87 moko 282: self().get_class()->name_cstr(),
283: self().type(),
1.86 misha 284: param_count,
285: count);
1.78 misha 286:
1.77 misha 287: size_t i=0;
1.86 misha 288: for(; i<count; i++) {
1.77 misha 289: const String& fname=*(*method.params_names)[i];
290: set_my_variable(fname, *params[i]);
291: }
292:
293: for(; i<param_count; i++) {
294: const String& fname=*(*method.params_names)[i];
1.68 misha 295: my->put(fname, VVoid::get());
1.1 paf 296: }
1.86 misha 297: } else
1.77 misha 298: fnumbered_params.store_params(params,count);
1.1 paf 299: }
300:
1.78 misha 301: void empty_params(){
302: if(method.params_names){
303: size_t param_count=method.params_names->count();
304: for(size_t i=0; i<param_count; i++) {
305: const String& fname=*(*method.params_names)[i];
306: my->put(fname, VVoid::get());
307: }
308: }
309: }
310:
1.72 misha 311: MethodParams* numbered_params() { return &fnumbered_params; }
1.18 paf 312:
1.63 misha 313: protected:
1.18 paf 314:
1.46 paf 315: void set_my_variable(const String& fname, Value& value) {
316: my->put(fname, &value); // remember param
1.25 paf 317: }
318:
1.46 paf 319: Value* get_result_variable();
1.1 paf 320:
321: public:
322:
1.87 moko 323: const Method& method;
1.1 paf 324:
1.41 paf 325: };
326:
1.85 misha 327: class VConstructorFrame: public VMethodFrame {
328: public:
1.87 moko 329: VConstructorFrame(const Method& amethod, VMethodFrame *acaller, Value& aself) : VMethodFrame(amethod, acaller, aself) {
330: // prevent non-string writes for better error reporting [constructors are not expected to return anything]
331: VMethodFrame::write(aself);
332: }
1.85 misha 333:
334: override void write(const String& /*astring*/, String::Language /*alang*/) {}
335: };
336:
1.1 paf 337: #endif
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