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1.117 paf 1: /** @file
1.118 paf 2: Parser: executor part of request class.
3:
1.88 paf 4: Copyright (c) 2001 ArtLebedev Group (http://www.artlebedev.com)
1.118 paf 5:
1.89 paf 6: Author: Alexander Petrosyan <paf@design.ru> (http://design.ru/paf)
1.88 paf 7:
1.121.2.2! paf 8: $Id: execute.C,v 1.121.2.1 2001/03/20 17:21:52 paf Exp $
1.1 paf 9: */
10:
1.117 paf 11: #include "code.h"
1.8 paf 12: #include "pa_array.h"
1.11 paf 13: #include "pa_request.h"
1.15 paf 14: #include "pa_vstring.h"
1.22 paf 15: #include "pa_vhash.h"
1.23 paf 16: #include "pa_vunknown.h"
1.34 paf 17: #include "pa_vcframe.h"
18: #include "pa_vmframe.h"
1.38 paf 19: #include "pa_vobject.h"
1.49 paf 20: #include "pa_vdouble.h"
1.54 paf 21: #include "pa_vbool.h"
1.94 paf 22: #include "pa_vtable.h"
1.1 paf 23:
24: #include <stdio.h>
1.110 paf 25: #include <string.h>
1.1 paf 26:
1.24 paf 27: #define PUSH(value) stack.push(value)
28: #define POP() static_cast<Value *>(stack.pop())
1.32 paf 29: #define POP_NAME() static_cast<Value *>(stack.pop())->as_string()
1.24 paf 30:
1.11 paf 31:
1.1 paf 32: char *opcode_name[]={
1.49 paf 33: // literals
1.109 paf 34: "VALUE", "CURLY_CODE__STORE_PARAM", "EXPR_CODE__STORE_PARAM",
1.49 paf 35:
36: // actions
1.51 paf 37: "WITH_SELF", "WITH_ROOT", "WITH_READ", "WITH_WRITE",
1.66 paf 38: "GET_CLASS",
1.80 paf 39: "CONSTRUCT_VALUE", "CONSTRUCT_DOUBLE",
1.108 paf 40: "WRITE_VALUE", "WRITE_EXPR_RESULT", "STRING__WRITE",
1.18 paf 41: "GET_ELEMENT", "GET_ELEMENT__WRITE",
1.1 paf 42: "CREATE_EWPOOL", "REDUCE_EWPOOL",
43: "CREATE_RWPOOL", "REDUCE_RWPOOL",
1.49 paf 44: "CREATE_SWPOOL", "REDUCE_SWPOOL",
1.1 paf 45: "GET_METHOD_FRAME",
46: "STORE_PARAM",
1.51 paf 47: "CALL",
1.49 paf 48:
49: // expression ops: unary
50: "NEG", "INV", "NOT", "DEF", "IN", "FEXISTS",
51: // expression ops: binary
52: "SUB", "ADD", "MUL", "DIV", "MOD",
1.56 paf 53: "BIN_AND", "BIN_OR", "BIN_XOR",
54: "LOG_AND", "LOG_OR", "LOG_XOR",
1.49 paf 55: "NUM_LT", "NUM_GT", "NUM_LE", "NUM_GE", "NUM_EQ", "NUM_NE",
1.103 paf 56: "STR_LT", "STR_GT", "STR_LE", "STR_GE", "STR_EQ", "STR_NE",
57: "IS"
1.1 paf 58: };
59:
1.107 paf 60: void va_log_printf(const char *fmt,va_list args) {
1.115 paf 61: return;
1.107 paf 62: vfprintf(stderr, fmt, args);
63: }
64:
1.105 paf 65: void log_printf(const char *fmt, ...) {
66: // TODO: куда-нибудь пристроить
1.107 paf 67: va_list args;
68: va_start(args,fmt);
69: va_log_printf(fmt,args);
70: va_end(args);
1.105 paf 71: }
72:
1.9 paf 73: void dump(int level, const Array& ops) {
1.23 paf 74: if(0){
75: int size=ops.size();
1.105 paf 76: //log_printf("size=%d\n", size);
1.23 paf 77: for(int i=0; i<size; i++) {
78: Operation op;
79: op.cast=ops.quick_get(i);
1.105 paf 80: log_printf("%8X\n", op.cast);
1.23 paf 81: }
82: }
83:
1.9 paf 84: int size=ops.size();
1.105 paf 85: //log_printf("size=%d\n", size);
1.1 paf 86: for(int i=0; i<size; i++) {
1.23 paf 87: Operation op;
88: op.cast=ops.quick_get(i);
1.105 paf 89: log_printf("%*s%s", level*4, "", opcode_name[op.code]);
1.1 paf 90:
1.86 paf 91: if(op.code==OP_VALUE || op.code==OP_STRING__WRITE) {
1.52 paf 92: Value *value=static_cast<Value *>(ops.quick_get(++i));
1.105 paf 93: log_printf(" \"%s\" %s", value->get_string()->cstr(), value->type());
1.15 paf 94: }
1.105 paf 95: log_printf("\n");
1.1 paf 96:
1.109 paf 97: if(op.code==OP_CURLY_CODE__STORE_PARAM || op.code==OP_EXPR_CODE__STORE_PARAM) {
1.10 paf 98: const Array *local_ops=reinterpret_cast<const Array *>(ops.quick_get(++i));
1.9 paf 99: dump(level+1, *local_ops);
1.1 paf 100: }
101: }
102: }
103:
1.32 paf 104: void Request::execute(const Array& ops) {
1.30 paf 105: if(1) {
1.105 paf 106: log_printf("source----------------------------\n");
1.12 paf 107: dump(0, ops);
1.105 paf 108: log_printf("execution-------------------------\n");
1.12 paf 109: }
110:
1.11 paf 111: int size=ops.size();
1.105 paf 112: //log_printf("size=%d\n", size);
1.11 paf 113: for(int i=0; i<size; i++) {
1.23 paf 114: Operation op;
115: op.cast=ops.quick_get(i);
1.105 paf 116: log_printf("%d:%s", stack.top_index()+1, opcode_name[op.code]);
1.11 paf 117:
1.23 paf 118: switch(op.code) {
1.51 paf 119: // param in next instruction
1.52 paf 120: case OP_VALUE:
1.32 paf 121: {
1.52 paf 122: Value *value=static_cast<Value *>(ops.quick_get(++i));
1.105 paf 123: log_printf(" \"%s\" %s", value->get_string()->cstr(), value->type());
1.52 paf 124: PUSH(value);
1.32 paf 125: break;
126: }
1.109 paf 127: case OP_CURLY_CODE__STORE_PARAM:
128: case OP_EXPR_CODE__STORE_PARAM:
1.32 paf 129: {
1.73 paf 130: VMethodFrame *frame=static_cast<VMethodFrame *>(stack.top_value());
1.65 paf 131: // code
1.32 paf 132: const Array *local_ops=reinterpret_cast<const Array *>(ops.quick_get(++i));
1.105 paf 133: log_printf(" (%d)\n", local_ops->size());
1.38 paf 134: dump(1, *local_ops);
1.63 paf 135:
1.109 paf 136: // when they evaluate expression parameter,
137: // the object expression result
138: // does not need to be written into calling frame
139: // it must go into any expressions using that parameter
140: // hence, zeroing junction.wcontext being created
141: // later, in .process would test that field
142: // in decision "which wwrapper to use"
1.32 paf 143: Junction& j=*NEW Junction(pool(),
1.45 paf 144: *self, 0, 0,
1.109 paf 145: root, frame, op.code==OP_EXPR_CODE__STORE_PARAM?0:frame, local_ops);
1.32 paf 146:
147: Value *value=NEW VJunction(j);
1.65 paf 148:
149: // store param
1.92 paf 150: frame->store_param(frame->name(), value);
1.32 paf 151: break;
152: }
1.66 paf 153: case OP_GET_CLASS:
1.38 paf 154: {
1.98 paf 155: // maybe the do ^class:method[] call, remember the fact
156: wcontext->set_somebody_entered_some_class();
157:
1.82 paf 158: const String& name=POP_NAME();
1.120 paf 159: Value *value=static_cast<Value *>(classes().get(name));
160: if(!value)
1.66 paf 161: THROW(0,0,
162: &name,
163: ": undefined class");
164:
1.120 paf 165: PUSH(value);
1.38 paf 166: break;
167: }
1.32 paf 168:
1.51 paf 169: // OP_WITH
1.37 paf 170: case OP_WITH_SELF:
171: {
172: PUSH(self);
173: break;
174: }
175: case OP_WITH_ROOT:
1.11 paf 176: {
1.37 paf 177: PUSH(root);
1.13 paf 178: break;
1.11 paf 179: }
1.15 paf 180: case OP_WITH_READ:
181: {
1.24 paf 182: PUSH(rcontext);
1.20 paf 183: break;
184: }
1.37 paf 185: case OP_WITH_WRITE:
1.20 paf 186: {
1.37 paf 187: PUSH(wcontext);
1.20 paf 188: break;
189: }
1.37 paf 190:
1.51 paf 191: // OTHER ACTIONS BUT WITHs
1.80 paf 192: case OP_CONSTRUCT_VALUE:
1.20 paf 193: {
1.37 paf 194: Value *value=POP();
1.82 paf 195: const String& name=POP_NAME();
1.37 paf 196: Value *ncontext=POP();
1.81 paf 197: ncontext->put_element(name, value);
1.37 paf 198: value->set_name(name);
1.15 paf 199: break;
200: }
1.80 paf 201: case OP_CONSTRUCT_EXPR:
202: {
203: Value *value=POP();
1.82 paf 204: const String& name=POP_NAME();
1.80 paf 205: Value *ncontext=POP();
1.81 paf 206: ncontext->put_element(name, value->get_expr_result());
1.80 paf 207: value->set_name(name);
208: break;
209: }
1.108 paf 210: case OP_WRITE_VALUE:
1.13 paf 211: {
1.24 paf 212: Value *value=POP();
1.92 paf 213: write_assign_lang(*value);
1.86 paf 214: break;
215: }
1.108 paf 216: case OP_WRITE_EXPR_RESULT:
217: {
218: Value *value=POP();
219: write_expr_result(*value->get_expr_result());
220: break;
221: }
1.86 paf 222: case OP_STRING__WRITE:
223: {
224: VString *vstring=static_cast<VString *>(ops.quick_get(++i));
1.108 paf 225: log_printf(" \"%s\"", vstring->string().cstr());
1.121.2.2! paf 226: write_no_lang(vstring->string());
1.13 paf 227: break;
1.14 paf 228: }
1.13 paf 229:
1.15 paf 230: case OP_GET_ELEMENT:
1.11 paf 231: {
1.17 paf 232: Value *value=get_element();
1.24 paf 233: PUSH(value);
1.17 paf 234: break;
235: }
236:
1.18 paf 237: case OP_GET_ELEMENT__WRITE:
1.17 paf 238: {
239: Value *value=get_element();
1.92 paf 240: write_assign_lang(*value);
1.17 paf 241: break;
242: }
243:
1.32 paf 244:
1.17 paf 245: case OP_CREATE_EWPOOL:
246: {
1.24 paf 247: PUSH(wcontext);
1.43 paf 248: wcontext=NEW WWrapper(pool(), 0 /* empty */, true /* constructing */);
1.17 paf 249: break;
250: }
251: case OP_REDUCE_EWPOOL:
252: {
1.36 paf 253: Value *value=wcontext->result();
1.25 paf 254: wcontext=static_cast<WContext *>(POP());
1.24 paf 255: PUSH(value);
1.13 paf 256: break;
1.15 paf 257: }
1.13 paf 258:
1.26 paf 259: case OP_CREATE_RWPOOL:
260: {
261: Value *ncontext=POP();
262: PUSH(rcontext);
263: rcontext=ncontext;
264: PUSH(wcontext);
1.43 paf 265: wcontext=NEW WWrapper(pool(), ncontext, false /* not constructing */);
1.26 paf 266: break;
267: }
268: case OP_REDUCE_RWPOOL:
269: {
1.82 paf 270: const String *string=wcontext->get_string();
1.80 paf 271: Value *value;
272: if(string)
273: value=NEW VString(*string);
274: else
275: value=NEW VUnknown(pool());
1.26 paf 276: wcontext=static_cast<WContext *>(POP());
277: rcontext=POP();
278: PUSH(value);
279: break;
280: }
1.49 paf 281: case OP_CREATE_SWPOOL:
282: {
283: PUSH(wcontext);
1.50 paf 284: wcontext=NEW WWrapper(pool(), 0 /* empty */, false /* not constructing */);
1.49 paf 285: break;
286: }
287: case OP_REDUCE_SWPOOL:
288: {
289: // from "$a $b" part of expression taking only string value,
290: // ignoring any other content of wcontext
1.82 paf 291: const String *string=wcontext->get_string();
1.80 paf 292: Value *value;
293: if(string)
294: value=NEW VString(*string);
295: else
296: NEW VUnknown(pool());
1.50 paf 297: wcontext=static_cast<WContext *>(POP());
1.49 paf 298: PUSH(value);
299: break;
300: }
301:
1.51 paf 302: // CALL
1.28 paf 303: case OP_GET_METHOD_FRAME:
304: {
1.32 paf 305: Value *value=POP();
1.111 paf 306: // info:
307: // code compiled so that this one's always method-junction,
308: // not a code-junction
1.32 paf 309: Junction *junction=value->get_junction();
1.31 paf 310: if(!junction)
1.28 paf 311: THROW(0,0,
1.42 paf 312: &value->name(),
1.111 paf 313: "(%s) not a method or junction, can not call it",
1.38 paf 314: value->type());
1.70 paf 315:
1.34 paf 316: VMethodFrame *frame=NEW VMethodFrame(pool(), *junction);
1.106 paf 317: frame->set_name(value->name());
1.28 paf 318: PUSH(frame);
319: break;
320: }
321: case OP_STORE_PARAM:
322: {
323: Value *value=POP();
1.73 paf 324: VMethodFrame *frame=static_cast<VMethodFrame *>(stack.top_value());
1.92 paf 325: frame->store_param(frame->name(), value);
1.29 paf 326: break;
327: }
328:
329: case OP_CALL:
330: {
1.105 paf 331: log_printf("->\n");
1.34 paf 332: VMethodFrame *frame=static_cast<VMethodFrame *>(POP());
333: frame->fill_unspecified_params();
1.45 paf 334: PUSH(self);
335: PUSH(root);
336: PUSH(rcontext);
337: PUSH(wcontext);
338:
1.100 paf 339: VStateless_class *called_class=frame->junction.self.get_class();
1.74 paf 340: // is context object or class & is it my class or my parent's class?
1.100 paf 341: VStateless_class *read_class=rcontext->get_class();
1.74 paf 342: if(read_class && read_class->is_or_derived_from(*called_class)) // yes
343: self=rcontext; // class dynamic call
1.75 paf 344: else // no, not me or relative of mine (total stranger)
1.98 paf 345: if(
346: wcontext->constructing() && // constructing?
347: wcontext->somebody_entered_some_class()) { // ^class:method[..]?
348: // yes, this is a constructor call
1.114 paf 349: // some stateless_object derivates with constructors
1.119 paf 350: if(called_class==table_class)///called_class->name()==TABLE_CLASS_NAME)
1.94 paf 351: self=NEW VTable(pool());
1.121 paf 352: else // stateful object
1.94 paf 353: self=NEW VObject(pool(), *called_class);
1.83 paf 354: frame->write(*self,
1.121.2.1 paf 355: String::UL_NO // not used, always an object, not string
1.83 paf 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: }