Annotation of parser3/src/main/execute.C, revision 1.117
1.117 ! paf 1: /** @file
1.88 paf 2: Parser
3: Copyright (c) 2001 ArtLebedev Group (http://www.artlebedev.com)
1.89 paf 4: Author: Alexander Petrosyan <paf@design.ru> (http://design.ru/paf)
1.88 paf 5:
1.117 ! paf 6: $Id: execute.C,v 1.116 2001/03/19 15:29:39 paf Exp $
1.1 paf 7: */
8:
1.117 ! paf 9: #include "code.h"
1.8 paf 10: #include "pa_array.h"
1.11 paf 11: #include "pa_request.h"
1.15 paf 12: #include "pa_vstring.h"
1.22 paf 13: #include "pa_vhash.h"
1.23 paf 14: #include "pa_vunknown.h"
1.34 paf 15: #include "pa_vcframe.h"
16: #include "pa_vmframe.h"
1.38 paf 17: #include "pa_vobject.h"
1.49 paf 18: #include "pa_vdouble.h"
1.54 paf 19: #include "pa_vbool.h"
1.94 paf 20: #include "pa_vtable.h"
1.1 paf 21:
22: #include <stdio.h>
1.110 paf 23: #include <string.h>
1.1 paf 24:
1.24 paf 25: #define PUSH(value) stack.push(value)
26: #define POP() static_cast<Value *>(stack.pop())
1.32 paf 27: #define POP_NAME() static_cast<Value *>(stack.pop())->as_string()
1.24 paf 28:
1.11 paf 29:
1.1 paf 30: char *opcode_name[]={
1.49 paf 31: // literals
1.109 paf 32: "VALUE", "CURLY_CODE__STORE_PARAM", "EXPR_CODE__STORE_PARAM",
1.49 paf 33:
34: // actions
1.51 paf 35: "WITH_SELF", "WITH_ROOT", "WITH_READ", "WITH_WRITE",
1.66 paf 36: "GET_CLASS",
1.80 paf 37: "CONSTRUCT_VALUE", "CONSTRUCT_DOUBLE",
1.108 paf 38: "WRITE_VALUE", "WRITE_EXPR_RESULT", "STRING__WRITE",
1.18 paf 39: "GET_ELEMENT", "GET_ELEMENT__WRITE",
1.1 paf 40: "CREATE_EWPOOL", "REDUCE_EWPOOL",
41: "CREATE_RWPOOL", "REDUCE_RWPOOL",
1.49 paf 42: "CREATE_SWPOOL", "REDUCE_SWPOOL",
1.1 paf 43: "GET_METHOD_FRAME",
44: "STORE_PARAM",
1.51 paf 45: "CALL",
1.49 paf 46:
47: // expression ops: unary
48: "NEG", "INV", "NOT", "DEF", "IN", "FEXISTS",
49: // expression ops: binary
50: "SUB", "ADD", "MUL", "DIV", "MOD",
1.56 paf 51: "BIN_AND", "BIN_OR", "BIN_XOR",
52: "LOG_AND", "LOG_OR", "LOG_XOR",
1.49 paf 53: "NUM_LT", "NUM_GT", "NUM_LE", "NUM_GE", "NUM_EQ", "NUM_NE",
1.103 paf 54: "STR_LT", "STR_GT", "STR_LE", "STR_GE", "STR_EQ", "STR_NE",
55: "IS"
1.1 paf 56: };
57:
1.107 paf 58: void va_log_printf(const char *fmt,va_list args) {
1.115 paf 59: return;
1.107 paf 60: vfprintf(stderr, fmt, args);
61: }
62:
1.105 paf 63: void log_printf(const char *fmt, ...) {
64: // TODO: куда-нибудь пристроить
1.107 paf 65: va_list args;
66: va_start(args,fmt);
67: va_log_printf(fmt,args);
68: va_end(args);
1.105 paf 69: }
70:
1.9 paf 71: void dump(int level, const Array& ops) {
1.23 paf 72: if(0){
73: int size=ops.size();
1.105 paf 74: //log_printf("size=%d\n", size);
1.23 paf 75: for(int i=0; i<size; i++) {
76: Operation op;
77: op.cast=ops.quick_get(i);
1.105 paf 78: log_printf("%8X\n", op.cast);
1.23 paf 79: }
80: }
81:
1.9 paf 82: int size=ops.size();
1.105 paf 83: //log_printf("size=%d\n", size);
1.1 paf 84: for(int i=0; i<size; i++) {
1.23 paf 85: Operation op;
86: op.cast=ops.quick_get(i);
1.105 paf 87: log_printf("%*s%s", level*4, "", opcode_name[op.code]);
1.1 paf 88:
1.86 paf 89: if(op.code==OP_VALUE || op.code==OP_STRING__WRITE) {
1.52 paf 90: Value *value=static_cast<Value *>(ops.quick_get(++i));
1.105 paf 91: log_printf(" \"%s\" %s", value->get_string()->cstr(), value->type());
1.15 paf 92: }
1.105 paf 93: log_printf("\n");
1.1 paf 94:
1.109 paf 95: if(op.code==OP_CURLY_CODE__STORE_PARAM || op.code==OP_EXPR_CODE__STORE_PARAM) {
1.10 paf 96: const Array *local_ops=reinterpret_cast<const Array *>(ops.quick_get(++i));
1.9 paf 97: dump(level+1, *local_ops);
1.1 paf 98: }
99: }
100: }
101:
1.32 paf 102: void Request::execute(const Array& ops) {
1.30 paf 103: if(1) {
1.105 paf 104: log_printf("source----------------------------\n");
1.12 paf 105: dump(0, ops);
1.105 paf 106: log_printf("execution-------------------------\n");
1.12 paf 107: }
108:
1.11 paf 109: int size=ops.size();
1.105 paf 110: //log_printf("size=%d\n", size);
1.11 paf 111: for(int i=0; i<size; i++) {
1.23 paf 112: Operation op;
113: op.cast=ops.quick_get(i);
1.105 paf 114: log_printf("%d:%s", stack.top_index()+1, opcode_name[op.code]);
1.11 paf 115:
1.23 paf 116: switch(op.code) {
1.51 paf 117: // param in next instruction
1.52 paf 118: case OP_VALUE:
1.32 paf 119: {
1.52 paf 120: Value *value=static_cast<Value *>(ops.quick_get(++i));
1.105 paf 121: log_printf(" \"%s\" %s", value->get_string()->cstr(), value->type());
1.52 paf 122: PUSH(value);
1.32 paf 123: break;
124: }
1.109 paf 125: case OP_CURLY_CODE__STORE_PARAM:
126: case OP_EXPR_CODE__STORE_PARAM:
1.32 paf 127: {
1.73 paf 128: VMethodFrame *frame=static_cast<VMethodFrame *>(stack.top_value());
1.65 paf 129: // code
1.32 paf 130: const Array *local_ops=reinterpret_cast<const Array *>(ops.quick_get(++i));
1.105 paf 131: log_printf(" (%d)\n", local_ops->size());
1.38 paf 132: dump(1, *local_ops);
1.63 paf 133:
1.109 paf 134: // when they evaluate expression parameter,
135: // the object expression result
136: // does not need to be written into calling frame
137: // it must go into any expressions using that parameter
138: // hence, zeroing junction.wcontext being created
139: // later, in .process would test that field
140: // in decision "which wwrapper to use"
1.32 paf 141: Junction& j=*NEW Junction(pool(),
1.45 paf 142: *self, 0, 0,
1.109 paf 143: root, frame, op.code==OP_EXPR_CODE__STORE_PARAM?0:frame, local_ops);
1.32 paf 144:
145: Value *value=NEW VJunction(j);
1.65 paf 146:
147: // store param
1.92 paf 148: frame->store_param(frame->name(), value);
1.32 paf 149: break;
150: }
1.66 paf 151: case OP_GET_CLASS:
1.38 paf 152: {
1.98 paf 153: // maybe the do ^class:method[] call, remember the fact
154: wcontext->set_somebody_entered_some_class();
155:
1.82 paf 156: const String& name=POP_NAME();
1.66 paf 157: VClass *vclass=static_cast<VClass *>(classes().get(name));
158: if(!vclass)
159: THROW(0,0,
160: &name,
161: ": undefined class");
162:
163: PUSH(vclass);
1.38 paf 164: break;
165: }
1.32 paf 166:
1.51 paf 167: // OP_WITH
1.37 paf 168: case OP_WITH_SELF:
169: {
170: PUSH(self);
171: break;
172: }
173: case OP_WITH_ROOT:
1.11 paf 174: {
1.37 paf 175: PUSH(root);
1.13 paf 176: break;
1.11 paf 177: }
1.15 paf 178: case OP_WITH_READ:
179: {
1.24 paf 180: PUSH(rcontext);
1.20 paf 181: break;
182: }
1.37 paf 183: case OP_WITH_WRITE:
1.20 paf 184: {
1.37 paf 185: PUSH(wcontext);
1.20 paf 186: break;
187: }
1.37 paf 188:
1.51 paf 189: // OTHER ACTIONS BUT WITHs
1.80 paf 190: case OP_CONSTRUCT_VALUE:
1.20 paf 191: {
1.37 paf 192: Value *value=POP();
1.82 paf 193: const String& name=POP_NAME();
1.37 paf 194: Value *ncontext=POP();
1.81 paf 195: ncontext->put_element(name, value);
1.37 paf 196: value->set_name(name);
1.15 paf 197: break;
198: }
1.80 paf 199: case OP_CONSTRUCT_EXPR:
200: {
201: Value *value=POP();
1.82 paf 202: const String& name=POP_NAME();
1.80 paf 203: Value *ncontext=POP();
1.81 paf 204: ncontext->put_element(name, value->get_expr_result());
1.80 paf 205: value->set_name(name);
206: break;
207: }
1.108 paf 208: case OP_WRITE_VALUE:
1.13 paf 209: {
1.24 paf 210: Value *value=POP();
1.92 paf 211: write_assign_lang(*value);
1.86 paf 212: break;
213: }
1.108 paf 214: case OP_WRITE_EXPR_RESULT:
215: {
216: Value *value=POP();
217: write_expr_result(*value->get_expr_result());
218: break;
219: }
1.86 paf 220: case OP_STRING__WRITE:
221: {
222: VString *vstring=static_cast<VString *>(ops.quick_get(++i));
1.108 paf 223: log_printf(" \"%s\"", vstring->string().cstr());
224: write(vstring->string());
1.13 paf 225: break;
1.14 paf 226: }
1.13 paf 227:
1.15 paf 228: case OP_GET_ELEMENT:
1.11 paf 229: {
1.17 paf 230: Value *value=get_element();
1.24 paf 231: PUSH(value);
1.17 paf 232: break;
233: }
234:
1.18 paf 235: case OP_GET_ELEMENT__WRITE:
1.17 paf 236: {
237: Value *value=get_element();
1.92 paf 238: write_assign_lang(*value);
1.17 paf 239: break;
240: }
241:
1.32 paf 242:
1.17 paf 243: case OP_CREATE_EWPOOL:
244: {
1.24 paf 245: PUSH(wcontext);
1.43 paf 246: wcontext=NEW WWrapper(pool(), 0 /* empty */, true /* constructing */);
1.17 paf 247: break;
248: }
249: case OP_REDUCE_EWPOOL:
250: {
1.36 paf 251: Value *value=wcontext->result();
1.25 paf 252: wcontext=static_cast<WContext *>(POP());
1.24 paf 253: PUSH(value);
1.13 paf 254: break;
1.15 paf 255: }
1.13 paf 256:
1.26 paf 257: case OP_CREATE_RWPOOL:
258: {
259: Value *ncontext=POP();
260: PUSH(rcontext);
261: rcontext=ncontext;
262: PUSH(wcontext);
1.43 paf 263: wcontext=NEW WWrapper(pool(), ncontext, false /* not constructing */);
1.26 paf 264: break;
265: }
266: case OP_REDUCE_RWPOOL:
267: {
1.82 paf 268: const String *string=wcontext->get_string();
1.80 paf 269: Value *value;
270: if(string)
271: value=NEW VString(*string);
272: else
273: value=NEW VUnknown(pool());
1.26 paf 274: wcontext=static_cast<WContext *>(POP());
275: rcontext=POP();
276: PUSH(value);
277: break;
278: }
1.49 paf 279: case OP_CREATE_SWPOOL:
280: {
281: PUSH(wcontext);
1.50 paf 282: wcontext=NEW WWrapper(pool(), 0 /* empty */, false /* not constructing */);
1.49 paf 283: break;
284: }
285: case OP_REDUCE_SWPOOL:
286: {
287: // from "$a $b" part of expression taking only string value,
288: // ignoring any other content of wcontext
1.82 paf 289: const String *string=wcontext->get_string();
1.80 paf 290: Value *value;
291: if(string)
292: value=NEW VString(*string);
293: else
294: NEW VUnknown(pool());
1.50 paf 295: wcontext=static_cast<WContext *>(POP());
1.49 paf 296: PUSH(value);
297: break;
298: }
299:
1.51 paf 300: // CALL
1.28 paf 301: case OP_GET_METHOD_FRAME:
302: {
1.32 paf 303: Value *value=POP();
1.111 paf 304: // info:
305: // code compiled so that this one's always method-junction,
306: // not a code-junction
1.32 paf 307: Junction *junction=value->get_junction();
1.31 paf 308: if(!junction)
1.28 paf 309: THROW(0,0,
1.42 paf 310: &value->name(),
1.111 paf 311: "(%s) not a method or junction, can not call it",
1.38 paf 312: value->type());
1.70 paf 313:
1.34 paf 314: VMethodFrame *frame=NEW VMethodFrame(pool(), *junction);
1.106 paf 315: frame->set_name(value->name());
1.28 paf 316: PUSH(frame);
317: break;
318: }
319: case OP_STORE_PARAM:
320: {
321: Value *value=POP();
1.73 paf 322: VMethodFrame *frame=static_cast<VMethodFrame *>(stack.top_value());
1.92 paf 323: frame->store_param(frame->name(), value);
1.29 paf 324: break;
325: }
326:
327: case OP_CALL:
328: {
1.105 paf 329: log_printf("->\n");
1.34 paf 330: VMethodFrame *frame=static_cast<VMethodFrame *>(POP());
331: frame->fill_unspecified_params();
1.45 paf 332: PUSH(self);
333: PUSH(root);
334: PUSH(rcontext);
335: PUSH(wcontext);
336:
1.100 paf 337: VStateless_class *called_class=frame->junction.self.get_class();
1.74 paf 338: // is context object or class & is it my class or my parent's class?
1.100 paf 339: VStateless_class *read_class=rcontext->get_class();
1.74 paf 340: if(read_class && read_class->is_or_derived_from(*called_class)) // yes
341: self=rcontext; // class dynamic call
1.75 paf 342: else // no, not me or relative of mine (total stranger)
1.98 paf 343: if(
344: wcontext->constructing() && // constructing?
345: wcontext->somebody_entered_some_class()) { // ^class:method[..]?
346: // yes, this is a constructor call
1.114 paf 347: // some stateless_object derivates with constructors
1.94 paf 348: if(called_class->name()==TABLE_CLASS_NAME)
349: self=NEW VTable(pool());
1.114 paf 350: else /*if(called_class->name()==ENV_CLASS_NAME)
1.101 paf 351: self=NEW VEnv(pool());
1.114 paf 352: else */ // stateful object
1.94 paf 353: self=NEW VObject(pool(), *called_class);
1.83 paf 354: frame->write(*self,
355: String::Untaint_lang::NO // not used, always an object, not string
356: );
1.75 paf 357: } else
358: self=&frame->junction.self; // no, static or simple dynamic call
359:
1.45 paf 360: frame->set_self(*self);
1.29 paf 361: root=rcontext=wcontext=frame;
1.47 paf 362: {
1.48 paf 363: // take object or class from any wrappers
1.102 paf 364: // and substitute class alias to the class they are called AS
365: Temp_alias temp_alias(*self->get_aliased(), *frame->junction.vclass);
1.68 paf 366:
1.99 paf 367: const Method& method=*frame->junction.method;
1.80 paf 368: if(method.native_code) { // native code?
1.92 paf 369: method.check_actual_numbered_params(
1.113 paf 370: frame->junction.self,
1.92 paf 371: frame->name(), frame->numbered_params());
1.113 paf 372: (*method.native_code)(
373: *this,
1.92 paf 374: frame->name(), frame->numbered_params()); // execute it
1.80 paf 375: } else // parser code
1.69 paf 376: execute(*method.parser_code); // execute it
1.47 paf 377: }
1.36 paf 378: Value *value=wcontext->result();
1.45 paf 379:
380: wcontext=static_cast<WContext *>(POP());
381: rcontext=POP();
382: root=POP();
383: self=static_cast<VAliased *>(POP());
1.62 paf 384:
1.61 paf 385: PUSH(value);
1.105 paf 386: log_printf("<-returned");
1.49 paf 387: break;
388: }
389:
1.55 paf 390: // expression ops: unary
391: case OP_NEG:
392: {
393: Value *operand=POP();
1.80 paf 394: Value *value=NEW VDouble(pool(), -operand->get_double());
1.55 paf 395: PUSH(value);
396: break;
397: }
398: case OP_INV:
399: {
400: Value *operand=POP();
1.97 paf 401: Value *value=NEW VDouble(pool(), ~(int)operand->get_double());
1.55 paf 402: PUSH(value);
403: break;
404: }
405: case OP_NOT:
406: {
407: Value *operand=POP();
1.78 paf 408: Value *value=NEW VBool(pool(), !operand->get_bool());
1.55 paf 409: PUSH(value);
410: break;
411: }
1.62 paf 412: case OP_DEF:
413: {
414: Value *operand=POP();
1.78 paf 415: Value *value=NEW VBool(pool(), operand->get_defined());
1.62 paf 416: PUSH(value);
417: break;
418: }
419: case OP_IN:
420: {
421: Value *operand=POP();
1.110 paf 422: const char *path=operand->as_string().cstr();
1.112 paf 423: Value *value=NEW VBool(pool(), strcmp(path, info.uri)<=0);
1.62 paf 424: PUSH(value);
425: break;
426: }
427: case OP_FEXISTS:
428: {
429: Value *operand=POP();
1.78 paf 430: Value *value=NEW VBool(pool(), true/*TODO*/);
1.62 paf 431: PUSH(value);
432: break;
433: }
1.55 paf 434:
435: // expression ops: binary
436: case OP_SUB:
1.53 paf 437: {
1.61 paf 438: Value *b=POP(); Value *a=POP();
1.80 paf 439: Value *value=NEW VDouble(pool(), a->get_double() - b->get_double());
1.53 paf 440: PUSH(value);
441: break;
442: }
1.55 paf 443: case OP_ADD:
1.53 paf 444: {
1.61 paf 445: Value *b=POP(); Value *a=POP();
1.80 paf 446: Value *value=NEW VDouble(pool(), a->get_double() + b->get_double());
1.53 paf 447: PUSH(value);
448: break;
449: }
1.49 paf 450: case OP_MUL:
451: {
1.61 paf 452: Value *b=POP(); Value *a=POP();
1.80 paf 453: Value *value=NEW VDouble(pool(), a->get_double() * b->get_double());
1.53 paf 454: PUSH(value);
455: break;
456: }
457: case OP_DIV:
458: {
1.61 paf 459: Value *b=POP(); Value *a=POP();
1.80 paf 460: Value *value=NEW VDouble(pool(), a->get_double() / b->get_double());
1.54 paf 461: PUSH(value);
462: break;
463: }
1.55 paf 464: case OP_MOD:
465: {
1.61 paf 466: Value *b=POP(); Value *a=POP();
1.78 paf 467: Value *value=NEW VDouble(pool(),
1.97 paf 468: (int)a->get_double() %
469: (int)b->get_double());
1.55 paf 470: PUSH(value);
471: break;
472: }
473: case OP_BIN_AND:
1.54 paf 474: {
1.61 paf 475: Value *b=POP(); Value *a=POP();
1.78 paf 476: Value *value=NEW VDouble(pool(),
1.97 paf 477: (int)a->get_double() &
478: (int)b->get_double());
1.54 paf 479: PUSH(value);
480: break;
481: }
1.55 paf 482: case OP_BIN_OR:
1.54 paf 483: {
1.61 paf 484: Value *b=POP(); Value *a=POP();
1.78 paf 485: Value *value=NEW VDouble(pool(),
1.97 paf 486: (int)a->get_double() |
487: (int)b->get_double());
1.55 paf 488: PUSH(value);
489: break;
490: }
1.56 paf 491: case OP_BIN_XOR:
492: {
1.61 paf 493: Value *b=POP(); Value *a=POP();
1.78 paf 494: Value *value=NEW VDouble(pool(),
1.97 paf 495: (int)a->get_double() ^
496: (int)b->get_double());
1.56 paf 497: PUSH(value);
498: break;
499: }
1.55 paf 500: case OP_LOG_AND:
501: {
1.61 paf 502: Value *b=POP(); Value *a=POP();
1.78 paf 503: Value *value=NEW VBool(pool(), a->get_bool() && b->get_bool());
1.55 paf 504: PUSH(value);
505: break;
506: }
507: case OP_LOG_OR:
508: {
1.61 paf 509: Value *b=POP(); Value *a=POP();
1.78 paf 510: Value *value=NEW VBool(pool(), a->get_bool() || b->get_bool());
1.56 paf 511: PUSH(value);
512: break;
513: }
514: case OP_LOG_XOR:
515: {
1.61 paf 516: Value *b=POP(); Value *a=POP();
1.78 paf 517: Value *value=NEW VBool(pool(), a->get_bool() ^ b->get_bool());
1.55 paf 518: PUSH(value);
519: break;
520: }
521: case OP_NUM_LT:
522: {
1.61 paf 523: Value *b=POP(); Value *a=POP();
1.78 paf 524: Value *value=NEW VBool(pool(), a->get_double() < b->get_double());
1.55 paf 525: PUSH(value);
526: break;
527: }
528: case OP_NUM_GT:
529: {
1.61 paf 530: Value *b=POP(); Value *a=POP();
1.78 paf 531: Value *value=NEW VBool(pool(), a->get_double() > b->get_double());
1.55 paf 532: PUSH(value);
533: break;
534: }
535: case OP_NUM_LE:
536: {
1.61 paf 537: Value *b=POP(); Value *a=POP();
1.78 paf 538: Value *value=NEW VBool(pool(), a->get_double() <= b->get_double());
1.55 paf 539: PUSH(value);
540: break;
541: }
542: case OP_NUM_GE:
543: {
1.61 paf 544: Value *b=POP(); Value *a=POP();
1.78 paf 545: Value *value=NEW VBool(pool(), a->get_double() >= b->get_double());
1.55 paf 546: PUSH(value);
547: break;
548: }
549: case OP_NUM_EQ:
550: {
1.61 paf 551: Value *b=POP(); Value *a=POP();
1.78 paf 552: Value *value=NEW VBool(pool(), a->get_double() == b->get_double());
1.55 paf 553: PUSH(value);
554: break;
555: }
556: case OP_NUM_NE:
557: {
1.61 paf 558: Value *b=POP(); Value *a=POP();
1.78 paf 559: Value *value=NEW VBool(pool(), a->get_double() != b->get_double());
1.54 paf 560: PUSH(value);
561: break;
562: }
1.58 paf 563: case OP_STR_LT:
564: {
1.61 paf 565: Value *b=POP(); Value *a=POP();
1.78 paf 566: Value *value=NEW VBool(pool(), a->as_string() < b->as_string());
1.58 paf 567: PUSH(value);
568: break;
569: }
570: case OP_STR_GT:
571: {
1.61 paf 572: Value *b=POP(); Value *a=POP();
1.78 paf 573: Value *value=NEW VBool(pool(), a->as_string() > b->as_string());
1.58 paf 574: PUSH(value);
575: break;
576: }
1.55 paf 577: case OP_STR_LE:
1.58 paf 578: {
1.61 paf 579: Value *b=POP(); Value *a=POP();
1.78 paf 580: Value *value=NEW VBool(pool(), a->as_string() <= b->as_string());
1.58 paf 581: PUSH(value);
582: break;
583: }
1.55 paf 584: case OP_STR_GE:
1.54 paf 585: {
1.61 paf 586: Value *b=POP(); Value *a=POP();
1.78 paf 587: Value *value=NEW VBool(pool(), a->as_string() >= b->as_string());
1.58 paf 588: PUSH(value);
589: break;
590: }
591: case OP_STR_EQ:
592: {
1.61 paf 593: Value *b=POP(); Value *a=POP();
1.78 paf 594: Value *value=NEW VBool(pool(), a->as_string() == b->as_string());
1.58 paf 595: PUSH(value);
596: break;
597: }
598: case OP_STR_NE:
599: {
1.61 paf 600: Value *b=POP(); Value *a=POP();
1.78 paf 601: Value *value=NEW VBool(pool(), a->as_string() != b->as_string());
1.103 paf 602: PUSH(value);
603: break;
604: }
605: case OP_IS:
606: {
607: Value *b=POP(); Value *a=POP();
608: Value *value=NEW VBool(pool(), b->as_string() == a->type());
1.49 paf 609: PUSH(value);
1.28 paf 610: break;
611: }
612:
1.11 paf 613: default:
1.67 paf 614: THROW(0,0,
615: 0,
616: "unhandled '%s' opcode", opcode_name[op.code]);
1.11 paf 617: }
1.105 paf 618: log_printf("\n");
1.11 paf 619: }
1.1 paf 620: }
1.17 paf 621:
622: Value *Request::get_element() {
1.82 paf 623: const String& name=POP_NAME();
1.24 paf 624: Value *ncontext=POP();
1.32 paf 625: Value *value=ncontext->get_element(name);
1.21 paf 626:
1.76 paf 627: if(value)
1.92 paf 628: value=&process(*value, &name); // process possible code-junction
1.76 paf 629: else {
630: value=NEW VUnknown(pool());
631: value->set_name(name);
632: }
1.63 paf 633:
1.17 paf 634: return value;
1.34 paf 635: }
1.70 paf 636:
1.116 paf 637: /**
638: intercept_string:
639: - true:
640: they want result=string value,
641: possible object result goes to wcontext
642: - false:
643: they want any result[string|object]
644: nothing goes to wcontext.
645: used in (expression) params evaluation
646: */
1.92 paf 647: Value& Request::process(Value& value, const String *name, bool intercept_string) {
1.91 paf 648: Value *result;
1.70 paf 649: Junction *junction=value.get_junction();
650: if(junction && junction->code) { // is it a code-junction?
1.92 paf 651: // process it
1.105 paf 652: log_printf("ja->\n");
1.70 paf 653: PUSH(self);
654: PUSH(root);
655: PUSH(rcontext);
656: PUSH(wcontext);
657:
1.71 paf 658: WContext *frame;
1.109 paf 659: // for expression method params
660: // wcontext is set 0
661: // using the fact in decision "which wwrapper to use"
662: bool using_code_frame=intercept_string && junction->wcontext;
663: if(using_code_frame) {
1.71 paf 664: // almost plain wwrapper about junction wcontext,
665: // BUT intercepts string writes
666: frame=NEW VCodeFrame(pool(), *junction->wcontext);
667: } else {
668: // plain wwrapper
1.108 paf 669: frame=NEW WWrapper(pool(), 0/*empty*/, false/*not constructing*/);
1.71 paf 670: }
671:
672: wcontext=frame;
1.70 paf 673: self=&junction->self;
674: root=junction->root;
675: rcontext=junction->rcontext;
676: execute(*junction->code);
1.109 paf 677: if(using_code_frame) {
1.71 paf 678: // CodeFrame soul:
679: // string writes were intercepted
680: // returning them as the result of getting code-junction
681: result=NEW VString(*frame->get_string());
682: } else
683: result=frame->result();
1.70 paf 684:
685: wcontext=static_cast<WContext *>(POP());
686: rcontext=POP();
687: root=POP();
688: self=static_cast<VAliased *>(POP());
689:
1.105 paf 690: log_printf("<-ja returned");
1.70 paf 691: } else
1.91 paf 692: result=&value;
693:
694: if(name)
695: result->set_name(*name);
696: return *result;
1.85 paf 697: }
698:
1.114 paf 699: const String *Request::execute_method(Value& aself, const Method& method, bool return_cstr) {
1.99 paf 700: PUSH(self);
701: PUSH(root);
702: PUSH(rcontext);
703: PUSH(wcontext);
704:
705: // initialize contexts
706: root=rcontext=self=&aself;
707: wcontext=NEW WWrapper(pool(), &aself, false /* not constructing */);
708:
709: // execute!
710: execute(*method.parser_code);
711:
712: // result
1.114 paf 713: const String *result;
1.99 paf 714: if(return_cstr)
1.114 paf 715: result=&wcontext->as_string();
1.99 paf 716: else
717: result=0; // ignore result
718:
719: wcontext=static_cast<WContext *>(POP());
720: rcontext=POP();
721: root=POP();
722: self=static_cast<VAliased *>(POP());
723:
724: // return
725: return result;
726: }
727:
1.114 paf 728: const String *Request::execute_method(Value& aself,
1.99 paf 729: const String& method_name, bool return_cstr) {
730: if(Value *value=aself.get_element(method_name))
731: if(Junction *junction=value->get_junction())
732: if(const Method *method=junction->method)
733: return execute_method(aself, *method, return_cstr);
734:
1.85 paf 735: return 0;
1.70 paf 736: }
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