3 * Copyright 2011 Google Inc.
5 * Use of this source code is governed by a BSD-style license that can be
6 * found in the LICENSE file.
10 #include "SkFloatingPoint.h"
13 #include "SkScriptCallBack.h"
14 #include "SkScriptRuntime.h"
16 #include "SkOpArray.h"
18 const SkScriptEngine2::OperatorAttributes SkScriptEngine2::gOpAttributes[] = {
19 { SkOperand2::kNoType, SkOperand2::kNoType, kNoBias, kResultIsNotBoolean },
20 { SkOperand2::OpType(SkOperand2::kS32 | SkOperand2::kScalar | SkOperand2::kString),
21 SkOperand2::OpType(SkOperand2::kS32 | SkOperand2::kScalar | SkOperand2::kString), kTowardsString, kResultIsNotBoolean }, // kAdd
22 { SkOperand2::kS32, SkOperand2::kS32, kNoBias, kResultIsNotBoolean }, // kBitAnd
23 { SkOperand2::kNoType, SkOperand2::kS32, kNoBias, kResultIsNotBoolean }, // kBitNot
24 { SkOperand2::kS32, SkOperand2::kS32, kNoBias, kResultIsNotBoolean }, // kBitOr
25 { SkOperand2::OpType(SkOperand2::kS32 | SkOperand2::kScalar),
26 SkOperand2::OpType(SkOperand2::kS32 | SkOperand2::kScalar), kNoBias, kResultIsNotBoolean }, // kDivide
27 { SkOperand2::OpType(SkOperand2::kS32 | SkOperand2::kScalar | SkOperand2::kString),
28 SkOperand2::OpType(SkOperand2::kS32 | SkOperand2::kScalar |SkOperand2:: kString), kTowardsNumber,
29 kResultIsBoolean }, // kEqual
30 { SkOperand2::kS32, SkOperand2::kNoType, kNoBias, kResultIsNotBoolean }, // kFlipOps
31 { SkOperand2::OpType(SkOperand2::kS32 | SkOperand2::kScalar | SkOperand2::kString),
32 SkOperand2::OpType(SkOperand2::kS32 | SkOperand2::kScalar | SkOperand2::kString), kTowardsNumber,
33 kResultIsBoolean }, // kGreaterEqual
34 { SkOperand2::kNoType, SkOperand2::kS32, kNoBias, kResultIsNotBoolean }, // kLogicalAnd (really, ToBool)
35 { SkOperand2::kNoType, SkOperand2::kS32, kNoBias, kResultIsNotBoolean }, // kLogicalNot
36 { SkOperand2::kS32, SkOperand2::kS32, kNoBias, kResultIsNotBoolean }, // kLogicalOr
37 { SkOperand2::kNoType, SkOperand2::OpType(SkOperand2::kS32 | SkOperand2::kScalar), kNoBias, kResultIsNotBoolean }, // kMinus
38 { SkOperand2::OpType(SkOperand2::kS32 | SkOperand2::kScalar),
39 SkOperand2::OpType(SkOperand2::kS32 |SkOperand2:: kScalar), kNoBias, kResultIsNotBoolean }, // kModulo
40 { SkOperand2::OpType(SkOperand2::kS32 | SkOperand2::kScalar),
41 SkOperand2::OpType(SkOperand2::kS32 | SkOperand2::kScalar), kNoBias, kResultIsNotBoolean }, // kMultiply
42 { SkOperand2::kS32, SkOperand2::kS32, kNoBias, kResultIsNotBoolean }, // kShiftLeft
43 { SkOperand2::kS32, SkOperand2::kS32, kNoBias, kResultIsNotBoolean }, // kShiftRight
44 { SkOperand2::OpType(SkOperand2::kS32 | SkOperand2::kScalar),
45 SkOperand2::OpType(SkOperand2::kS32 | SkOperand2::kScalar), kNoBias, kResultIsNotBoolean }, // kSubtract
46 { SkOperand2::kS32, SkOperand2::kS32, kNoBias, kResultIsNotBoolean } // kXor
49 #define kBracketPrecedence 16
50 #define kIfElsePrecedence 15
52 const signed char SkScriptEngine2::gPrecedence[] = {
69 7, // kShiftRight, // signed
72 kBracketPrecedence, // kArrayOp
73 kIfElsePrecedence, // kElse
74 kIfElsePrecedence, // kIf
75 kBracketPrecedence, // kParen
78 const SkScriptEngine2::TypeOp SkScriptEngine2::gTokens[] = {
81 kBitAndInt, // kBitAnd,
82 kBitNotInt, // kBitNot,
84 kDivideInt, // kDivide,
86 kFlipOpsOp, // kFlipOps,
87 kGreaterEqualInt, // kGreaterEqual,
88 kLogicalAndInt, // kLogicalAnd,
89 kLogicalNotInt, // kLogicalNot,
90 kLogicalOrInt, // kLogicalOr,
92 kModuloInt, // kModulo,
93 kMultiplyInt, // kMultiply,
94 kShiftLeftInt, // kShiftLeft,
95 kShiftRightInt, // kShiftRight, // signed
96 kSubtractInt, // kSubtract,
100 static inline bool is_between(int c, int min, int max)
102 return (unsigned)(c - min) <= (unsigned)(max - min);
105 static inline bool is_ws(int c)
107 return is_between(c, 1, 32);
110 static int token_length(const char* start) {
112 if (! is_between(ch, 'a' , 'z') && ! is_between(ch, 'A', 'Z') && ch != '_' && ch != '$')
116 ch = start[++length];
117 while (is_between(ch, 'a' , 'z') || is_between(ch, 'A', 'Z') || is_between(ch, '0', '9') ||
118 ch == '_' || ch == '$');
122 SkScriptEngine2::SkScriptEngine2(SkOperand2::OpType returnType) : fActiveStream(&fStream),
123 fTokenLength(0), fReturnType(returnType), fError(kNoError),
124 fAccumulatorType(SkOperand2::kNoType),
125 fBranchPopAllowed(true), fConstExpression(true), fOperandInUse(false)
127 Branch branch(kUnassigned, 0, 0);
128 fBranchStack.push(branch);
129 *fOpStack.push() = (Op) kParen;
132 SkScriptEngine2::~SkScriptEngine2() {
133 for (SkString** stringPtr = fTrackString.begin(); stringPtr < fTrackString.end(); stringPtr++)
135 for (SkOpArray** arrayPtr = fTrackArray.begin(); arrayPtr < fTrackArray.end(); arrayPtr++)
139 void SkScriptEngine2::addToken(SkScriptEngine2::TypeOp op) {
140 int limit = fBranchStack.count() - 1;
141 for (int index = 0; index < limit; index++) {
142 Branch& branch = fBranchStack.index(index);
143 if (branch.fPrimed == Branch::kIsPrimed)
144 resolveBranch(branch);
146 if (fBranchPopAllowed) {
147 while (fBranchStack.top().fDone == Branch::kIsDone)
150 unsigned char charOp = (unsigned char) op;
151 fActiveStream->write(&charOp, sizeof(charOp));
154 void SkScriptEngine2::addTokenConst(SkScriptValue2* value, AddTokenRegister reg,
155 SkOperand2::OpType toType, SkScriptEngine2::TypeOp op) {
156 if (value->fIsConstant == SkScriptValue2::kConstant && convertTo(toType, value))
158 addTokenValue(*value, reg);
160 value->fIsWritten = SkScriptValue2::kWritten;
161 value->fType = toType;
164 void SkScriptEngine2::addTokenInt(int integer) {
165 fActiveStream->write(&integer, sizeof(integer));
168 void SkScriptEngine2::addTokenScalar(SkScalar scalar) {
169 fActiveStream->write(&scalar, sizeof(scalar));
172 void SkScriptEngine2::addTokenString(const SkString& string) {
173 int size = SkToInt(string.size());
175 fActiveStream->write(string.c_str(), size);
178 void SkScriptEngine2::addTokenValue(const SkScriptValue2& value, AddTokenRegister reg) {
179 if (value.isConstant() == false) {
180 if (reg == kAccumulator) {
181 if (fAccumulatorType == SkOperand2::kNoType)
182 addToken(kAccumulatorPop);
188 if (reg == kAccumulator && fAccumulatorType != SkOperand2::kNoType)
189 addToken(kAccumulatorPush);
190 switch (value.fType) {
191 case SkOperand2::kS32:
192 addToken(reg == kAccumulator ? kIntegerAccumulator : kIntegerOperand);
193 addTokenInt(value.fOperand.fS32);
194 if (reg == kAccumulator)
195 fAccumulatorType = SkOperand2::kS32;
197 fOperandInUse = true;
199 case SkOperand2::kScalar:
200 addToken(reg == kAccumulator ? kScalarAccumulator : kScalarOperand);
201 addTokenScalar(value.fOperand.fScalar);
202 if (reg == kAccumulator)
203 fAccumulatorType = SkOperand2::kScalar;
205 fOperandInUse = true;
207 case SkOperand2::kString:
208 addToken(reg == kAccumulator ? kStringAccumulator : kStringOperand);
209 addTokenString(*value.fOperand.fString);
210 if (reg == kAccumulator)
211 fAccumulatorType = SkOperand2::kString;
213 fOperandInUse = true;
216 SkASSERT(0); //!!! not implemented yet
220 int SkScriptEngine2::arithmeticOp(char ch, char nextChar, bool lastPush) {
222 bool reverseOperands = false;
223 bool negateResult = false;
227 // !!! ignoring unary plus as implemented here has the side effect of
228 // suppressing errors like +"hi"
229 if (lastPush == false) // unary plus, don't push an operator
234 op = lastPush ? kSubtract : kMinus;
243 if (nextChar == '>') {
250 reverseOperands = negateResult = true;
253 if (nextChar == '<') {
258 reverseOperands = nextChar == '=';
259 negateResult = ! reverseOperands;
260 advance += reverseOperands;
263 if (nextChar == '=') {
269 if (nextChar == '=') {
288 *fOpStack.push() = (Op) kParen;
291 SkASSERT(nextChar != '&');
295 SkASSERT(nextChar != '|');
305 if (op == kUnassigned)
307 signed char precedence = gPrecedence[op];
312 compare = fOpStack.index(idx);
313 if ((compare & kArtificialOp) == 0)
317 signed char topPrecedence = gPrecedence[compare];
318 SkASSERT(topPrecedence != -1);
319 if (topPrecedence > precedence || (topPrecedence == precedence &&
320 gOpAttributes[op].fLeftType == SkOperand2::kNoType)) {
326 *fOpStack.push() = (Op) (kLogicalNot | kArtificialOp);
329 *fOpStack.push() = (Op) (kFlipOps | kArtificialOp);
334 bool SkScriptEngine2::convertParams(SkTDArray<SkScriptValue2>* params,
335 const SkOperand2::OpType* paramTypes, int paramCount) {
336 int count = params->count();
337 if (count > paramCount) {
339 return false; // too many parameters passed
341 for (int index = 0; index < count; index++)
342 convertTo(paramTypes[index], &(*params)[index]);
346 bool SkScriptEngine2::convertTo(SkOperand2::OpType toType, SkScriptValue2* value ) {
347 SkOperand2::OpType type = value->fType;
350 if (type == SkOperand2::kObject) {
351 if (handleUnbox(value) == false)
353 return convertTo(toType, value);
355 return ConvertTo(this, toType, value);
358 bool SkScriptEngine2::evaluateDot(const char*& script) {
359 size_t fieldLength = token_length(++script); // skip dot
360 SkASSERT(fieldLength > 0); // !!! add error handling
361 const char* field = script;
362 script += fieldLength;
363 bool success = handleProperty();
364 if (success == false) {
365 fError = kCouldNotFindReferencedID;
368 return evaluateDotParam(script, field, fieldLength);
373 bool SkScriptEngine2::evaluateDotParam(const char*& script, const char* field, size_t fieldLength) {
374 SkScriptValue2& top = fValueStack.top();
375 if (top.fType != SkOperand2::kObject)
377 void* object = top.fOperand.fObject;
379 char ch; // see if it is a simple member or a function
380 while (is_ws(ch = script[0]))
384 success = handleMember(field, fieldLength, object);
386 SkTDArray<SkScriptValue2> params;
387 *fBraceStack.push() = kFunctionBrace;
388 success = functionParams(&script, ¶ms);
390 success = handleMemberFunction(field, fieldLength, object, ¶ms);
395 bool SkScriptEngine2::evaluateScript(const char** scriptPtr, SkScriptValue2* value) {
396 // fArrayOffset = 0; // no support for structures for now
399 if (strncmp(*scriptPtr, "#script:", sizeof("#script:") - 1) == 0) {
400 *scriptPtr += sizeof("#script:") - 1;
401 if (fReturnType == SkOperand2::kNoType || fReturnType == SkOperand2::kString) {
402 success = innerScript(scriptPtr, value);
404 inner = value->fOperand.fString->c_str();
408 success = innerScript(scriptPtr, value);
409 const char* script = *scriptPtr;
411 while (is_ws(ch = script[0]))
414 // error may trigger on scripts like "50,0" that were intended to be written as "[50, 0]"
420 void SkScriptEngine2::forget(SkOpArray* array) {
421 if (array->getType() == SkOperand2::kString) {
422 for (int index = 0; index < array->count(); index++) {
423 SkString* string = (*array)[index].fString;
424 int found = fTrackString.find(string);
426 fTrackString.remove(found);
430 if (array->getType() == SkOperand2::kArray) {
431 for (int index = 0; index < array->count(); index++) {
432 SkOpArray* child = (*array)[index].fArray;
433 forget(child); // forgets children of child
434 int found = fTrackArray.find(child);
436 fTrackArray.remove(found);
441 bool SkScriptEngine2::functionParams(const char** scriptPtr, SkTDArray<SkScriptValue2>* params) {
442 (*scriptPtr)++; // skip open paren
443 *fOpStack.push() = (Op) kParen;
444 *fBraceStack.push() = kFunctionBrace;
446 SkScriptValue2 value;
447 bool success = innerScript(scriptPtr, &value);
449 if (success == false)
451 *params->append() = value;
452 } while ((*scriptPtr)[-1] == ',');
454 fOpStack.pop(); // pop paren
455 (*scriptPtr)++; // advance beyond close paren
459 size_t SkScriptEngine2::getTokenOffset() {
460 return fActiveStream->getOffset();
463 SkOperand2::OpType SkScriptEngine2::getUnboxType(SkOperand2 scriptValue) {
464 for (SkScriptCallBack** callBack = fCallBackArray.begin(); callBack < fCallBackArray.end(); callBack++) {
465 if ((*callBack)->getType() != SkScriptCallBack::kUnbox)
467 return (*callBack)->getReturnType(0, &scriptValue);
469 return SkOperand2::kObject;
472 bool SkScriptEngine2::innerScript(const char** scriptPtr, SkScriptValue2* value) {
473 const char* script = *scriptPtr;
475 bool lastPush = false;
477 int opBalance = fOpStack.count();
478 int baseBrace = fBraceStack.count();
479 int branchBalance = fBranchStack.count();
480 while ((ch = script[0]) != '\0') {
485 SkScriptValue2 operand;
486 const char* dotCheck;
487 if (fBraceStack.count() > baseBrace) {
488 if (fBraceStack.top() == kArrayBrace) {
489 SkScriptValue2 tokenValue;
490 success = innerScript(&script, &tokenValue); // terminate and return on comma, close brace
493 SkOperand2::OpType type = fReturnType;
494 if (fReturnType == SkOperand2::kNoType) {
495 // !!! short sighted; in the future, allow each returned array component to carry
496 // its own type, and let caller do any needed conversions
497 if (value->fOperand.fArray->count() == 0)
498 value->fOperand.fArray->setType(type = tokenValue.fType);
500 type = value->fOperand.fArray->getType();
502 if (tokenValue.fType != type)
503 convertTo(type, &tokenValue);
504 *value->fOperand.fArray->append() = tokenValue.fOperand;
509 SkASSERT(token_length(script) > 0);
512 if (lastPush != false && fTokenLength > 0) {
514 *fBraceStack.push() = kFunctionBrace;
515 SkString functionName(fToken, fTokenLength);
517 if (handleFunction(&script) == false)
521 } else if (ch == '[') {
522 if (handleProperty() == false) {
526 if (handleArrayIndexer(&script) == false)
530 } else if (ch != '.') {
531 if (handleProperty() == false) {
539 if (ch == '0' && (script[1] & ~0x20) == 'X') {
540 SkASSERT(lastPush == false);
542 script = SkParse::FindHex(script, (uint32_t*) &operand.fOperand.fS32);
546 if (lastPush == false && ch == '.')
548 if (ch >= '0' && ch <= '9') {
549 SkASSERT(lastPush == false);
550 dotCheck = SkParse::FindS32(script, &operand.fOperand.fS32);
551 if (dotCheck[0] != '.') {
554 operand.fType = SkOperand2::kS32;
557 script = SkParse::FindScalar(script, &operand.fOperand.fScalar);
558 operand.fType = SkOperand2::kScalar;
560 operand.fIsConstant = SkScriptValue2::kConstant;
561 fValueStack.push(operand);
565 int length = token_length(script);
567 SkASSERT(lastPush == false);
569 fTokenLength = length;
574 char startQuote = ch;
575 if (startQuote == '\'' || startQuote == '\"') {
576 SkASSERT(lastPush == false);
577 operand.fOperand.fString = new SkString();
579 const char* stringStart = script;
580 do { // measure string
581 if (script[0] == '\\')
584 SkASSERT(script[0]); // !!! throw an error
585 } while (script[0] != startQuote);
586 operand.fOperand.fString->set(stringStart, script - stringStart);
587 script = stringStart;
588 char* stringWrite = operand.fOperand.fString->writable_str();
590 if (script[0] == '\\')
592 *stringWrite++ = script[0];
594 SkASSERT(script[0]); // !!! throw an error
595 } while (script[0] != startQuote);
597 track(operand.fOperand.fString);
598 operand.fType = SkOperand2::kString;
599 operand.fIsConstant = SkScriptValue2::kConstant;
600 fValueStack.push(operand);
605 if (fTokenLength == 0) {
606 int tokenLength = token_length(++script);
607 const char* token = script;
608 script += tokenLength;
609 SkASSERT(fValueStack.count() > 0); // !!! add error handling
611 fValueStack.pop(&top);
613 addTokenInt(top.fType);
615 top.fType = SkOperand2::kObject;
616 top.fIsConstant = SkScriptValue2::kVariable;
617 fConstExpression = false;
618 fValueStack.push(top);
619 success = evaluateDotParam(script, token, tokenLength);
624 // get next token, and evaluate immediately
625 success = evaluateDot(script);
626 if (success == false) {
634 if (lastPush == false) {
636 *fBraceStack.push() = kArrayBrace;
637 operand.fOperand.fArray = value->fOperand.fArray = new SkOpArray(fReturnType);
638 track(value->fOperand.fArray);
640 operand.fType = SkOperand2::kArray;
641 operand.fIsConstant = SkScriptValue2::kVariable;
642 fValueStack.push(operand);
645 if (handleArrayIndexer(&script) == false)
650 #if 0 // structs not supported for now
652 if (lastPush == false) {
654 *fBraceStack.push() = kStructBrace;
656 *fTypeStack.push() = (SkOpType) kStruct;
657 fOperandStack.push(operand);
660 SkASSERT(0); // braces in other contexts aren't supported yet
663 if (ch == ')' && fBraceStack.count() > 0) {
664 BraceStyle braceStyle = fBraceStack.top();
665 if (braceStyle == kFunctionBrace) {
670 if (ch == ',' || ch == ']') {
673 fBraceStack.pop(&match);
674 SkASSERT(match == kArrayBrace);
677 // !!! see if brace or bracket is correct closer
680 char nextChar = script[1];
681 int advance = logicalOp(ch, nextChar);
683 advance = arithmeticOp(ch, nextChar, lastPush);
684 if (advance == 0) // unknown token
688 lastPush = ch == ']' || ch == ')';
690 if (fTokenLength > 0) {
691 success = handleProperty();
695 branchBalance = fBranchStack.count() - branchBalance;
696 fBranchPopAllowed = false;
697 while (branchIndex < branchBalance) {
698 Branch& branch = fBranchStack.index(branchIndex++);
699 if (branch.fPrimed == Branch::kIsPrimed)
701 Op branchOp = branch.fOperator;
702 SkOperand2::OpType lastType = fValueStack.top().fType;
703 addTokenValue(fValueStack.top(), kAccumulator);
705 if (branchOp == kLogicalAnd || branchOp == kLogicalOr) {
706 if (branch.fOperator == kLogicalAnd)
710 resolveBranch(branch);
711 SkScriptValue2 operand;
712 operand.fType = lastType;
713 // !!! note that many branching expressions could be constant
714 // today, we always evaluate branches as returning variables
715 operand.fIsConstant = SkScriptValue2::kVariable;
716 fValueStack.push(operand);
718 if (branch.fDone == Branch::kIsNotDone)
721 fBranchPopAllowed = true;
722 while (fBranchStack.top().fDone == Branch::kIsDone)
724 while (fOpStack.count() > opBalance) { // leave open paren
725 if (processOp() == false)
728 SkOperand2::OpType topType = fValueStack.count() > 0 ? fValueStack.top().fType : SkOperand2::kNoType;
729 if (topType != fReturnType &&
730 topType == SkOperand2::kString && fReturnType != SkOperand2::kNoType) { // if result is a string, give handle property a chance to convert it to the property value
731 SkString* string = fValueStack.top().fOperand.fString;
732 fToken = string->c_str();
733 fTokenLength = string->size();
735 success = handleProperty();
736 if (success == false) { // if it couldn't convert, return string (error?)
737 SkScriptValue2 operand;
738 operand.fType = SkOperand2::kString;
739 operand.fOperand.fString = string;
740 operand.fIsConstant = SkScriptValue2::kVariable; // !!! ?
741 fValueStack.push(operand);
744 if (fStream.getOffset() > 0) {
746 SkAutoDataUnref data(fStream.copyToData());
748 decompile(data->bytes(), data->size());
750 SkScriptRuntime runtime(fCallBackArray);
751 runtime.executeTokens((unsigned char*) data->bytes());
752 SkScriptValue2 value1;
753 runtime.getResult(&value1.fOperand);
754 value1.fType = fReturnType;
755 fValueStack.push(value1);
758 if (fValueStack.count() == 0)
760 fValueStack.pop(value);
761 if (value->fType != fReturnType && value->fType == SkOperand2::kObject &&
762 fReturnType != SkOperand2::kNoType)
763 convertTo(fReturnType, value);
765 // if (fBranchStack.top().fOpStackDepth > fOpStack.count())
768 return true; // no error
771 bool SkScriptEngine2::handleArrayIndexer(const char** scriptPtr) {
772 SkScriptValue2 scriptValue;
774 *fOpStack.push() = (Op) kParen;
775 *fBraceStack.push() = kArrayBrace;
776 SkOperand2::OpType saveType = fReturnType;
777 fReturnType = SkOperand2::kS32;
778 bool success = innerScript(scriptPtr, &scriptValue);
779 fReturnType = saveType;
781 success = convertTo(SkOperand2::kS32, &scriptValue);
783 int index = scriptValue.fOperand.fS32;
784 fValueStack.pop(&scriptValue);
785 if (scriptValue.fType == SkOperand2::kObject) {
786 success = handleUnbox(&scriptValue);
788 SkASSERT(scriptValue.fType == SkOperand2::kArray);
790 scriptValue.fType = scriptValue.fOperand.fArray->getType();
791 // SkASSERT(index >= 0);
792 if ((unsigned) index >= (unsigned) scriptValue.fOperand.fArray->count()) {
793 fError = kArrayIndexOutOfBounds;
796 scriptValue.fOperand = scriptValue.fOperand.fArray->begin()[index];
797 scriptValue.fIsConstant = SkScriptValue2::kVariable;
798 fValueStack.push(scriptValue);
799 fOpStack.pop(); // pop paren
803 bool SkScriptEngine2::handleFunction(const char** scriptPtr) {
804 const char* functionName = fToken;
805 size_t functionNameLen = fTokenLength;
807 SkTDArray<SkScriptValue2> params;
808 bool success = functionParams(scriptPtr, ¶ms);
809 if (success == false)
812 for (SkScriptCallBack** callBack = fCallBackArray.begin(); callBack < fCallBackArray.end(); callBack++) {
813 if ((*callBack)->getType() != SkScriptCallBack::kFunction)
815 SkScriptValue2 callbackResult;
816 success = (*callBack)->getReference(functionName, functionNameLen, &callbackResult);
818 callbackResult.fType = (*callBack)->getReturnType(callbackResult.fOperand.fReference, NULL);
819 callbackResult.fIsConstant = SkScriptValue2::kVariable;
820 fValueStack.push(callbackResult);
831 bool SkScriptEngine2::handleMember(const char* field, size_t len, void* object) {
833 for (SkScriptCallBack** callBack = fCallBackArray.begin(); callBack < fCallBackArray.end(); callBack++) {
834 if ((*callBack)->getType() != SkScriptCallBack::kMember)
836 SkScriptValue2 callbackResult;
837 success = (*callBack)->getReference(field, len, &callbackResult);
839 if (callbackResult.fType == SkOperand2::kString)
840 track(callbackResult.fOperand.fString);
841 callbackResult.fIsConstant = SkScriptValue2::kVariable;
842 fValueStack.push(callbackResult);
851 bool SkScriptEngine2::handleMemberFunction(const char* field, size_t len, void* object,
852 SkTDArray<SkScriptValue2>* params) {
854 for (SkScriptCallBack** callBack = fCallBackArray.begin(); callBack < fCallBackArray.end(); callBack++) {
855 if ((*callBack)->getType() != SkScriptCallBack::kMemberFunction)
857 SkScriptValue2 callbackResult;
858 success = (*callBack)->getReference(field, len, &callbackResult);
860 if (callbackResult.fType == SkOperand2::kString)
861 track(callbackResult.fOperand.fString);
862 callbackResult.fIsConstant = SkScriptValue2::kVariable;
863 fValueStack.push(callbackResult);
872 bool SkScriptEngine2::handleProperty() {
874 for (SkScriptCallBack** callBack = fCallBackArray.begin(); callBack < fCallBackArray.end(); callBack++) {
875 if ((*callBack)->getType() != SkScriptCallBack::kProperty)
877 SkScriptValue2 callbackResult;
878 success = (*callBack)->getReference(fToken, fTokenLength, &callbackResult);
880 if (callbackResult.fType == SkOperand2::kString && callbackResult.fOperand.fString == NULL) {
881 callbackResult.fOperand.fString = new SkString(fToken, fTokenLength);
882 track(callbackResult.fOperand.fString);
884 callbackResult.fIsConstant = SkScriptValue2::kVariable;
885 fValueStack.push(callbackResult);
894 bool SkScriptEngine2::handleUnbox(SkScriptValue2* scriptValue) {
896 for (SkScriptCallBack** callBack = fCallBackArray.begin(); callBack < fCallBackArray.end(); callBack++) {
897 if ((*callBack)->getType() != SkScriptCallBack::kUnbox)
899 SkScriptCallBackConvert* callBackConvert = (SkScriptCallBackConvert*) *callBack;
900 success = callBackConvert->convert(scriptValue->fType, &scriptValue->fOperand);
902 if (scriptValue->fType == SkOperand2::kString)
903 track(scriptValue->fOperand.fString);
912 // note that entire expression is treated as if it were enclosed in parens
913 // an open paren is always the first thing in the op stack
915 int SkScriptEngine2::logicalOp(char ch, char nextChar) {
918 signed char precedence;
948 precedence = gPrecedence[op];
950 fBranchPopAllowed = false;
952 while (gPrecedence[fOpStack.top() & ~kArtificialOp] < precedence)
954 Branch& branch = fBranchStack.index(branchIndex++);
955 Op branchOp = branch.fOperator;
956 if (gPrecedence[branchOp] >= precedence)
958 addTokenValue(fValueStack.top(), kAccumulator);
960 if (branchOp == kLogicalAnd || branchOp == kLogicalOr) {
961 if (branch.fOperator == kLogicalAnd)
965 resolveBranch(branch);
966 if (branch.fDone == Branch::kIsNotDone)
969 fBranchPopAllowed = true;
970 while (fBranchStack.top().fDone == Branch::kIsDone)
972 processLogicalOp(op);
976 void SkScriptEngine2::processLogicalOp(Op op) {
980 SkASSERT(fOpStack.count() > 1 && fOpStack.top() == op); // !!! add error handling
984 SkScriptValue2 value;
985 fValueStack.pop(&value);
986 SkASSERT(value.fType == SkOperand2::kS32 || value.fType == SkOperand2::kScalar); // !!! add error handling (although, could permit strings eventually)
987 int index = value.fType == SkOperand2::kScalar ? SkScalarFloorToInt(value.fOperand.fScalar) :
989 SkScriptValue2 arrayValue;
990 fValueStack.pop(&arrayValue);
991 SkASSERT(arrayValue.fType == SkOperand2::kArray); // !!! add error handling
992 SkOpArray* array = arrayValue.fOperand.fArray;
994 SkDEBUGCODE(bool success = ) array->getIndex(index, &operand);
995 SkASSERT(success); // !!! add error handling
996 SkScriptValue2 resultValue;
997 resultValue.fType = array->getType();
998 resultValue.fOperand = operand;
999 resultValue.fIsConstant = SkScriptValue2::kVariable;
1000 fValueStack.push(resultValue);
1004 if (fAccumulatorType == SkOperand2::kNoType) {
1005 addTokenValue(fValueStack.top(), kAccumulator);
1008 SkASSERT(fAccumulatorType != SkOperand2::kString); // !!! add error handling
1010 Branch branch(op, fOpStack.count(), getTokenOffset());
1011 *fBranchStack.push() = branch;
1012 addTokenInt(0); // placeholder for future branch
1013 fAccumulatorType = SkOperand2::kNoType;
1016 addTokenValue(fValueStack.top(), kAccumulator);
1019 size_t newOffset = getTokenOffset();
1020 addTokenInt(0); // placeholder for future branch
1021 Branch& branch = fBranchStack.top();
1022 resolveBranch(branch);
1023 branch.fOperator = op;
1024 branch.fDone = Branch::kIsNotDone;
1025 SkASSERT(branch.fOpStackDepth == fOpStack.count());
1026 branch.fOffset = SkToU16(newOffset);
1027 fAccumulatorType = SkOperand2::kNoType;
1031 Branch& oldTop = fBranchStack.top();
1032 Branch::Primed wasPrime = oldTop.fPrimed;
1033 Branch::Done wasDone = oldTop.fDone;
1034 oldTop.fPrimed = Branch::kIsNotPrimed;
1035 oldTop.fDone = Branch::kIsNotDone;
1036 if (fAccumulatorType == SkOperand2::kNoType) {
1037 SkASSERT(fValueStack.top().fType == SkOperand2::kS32); // !!! add error handling, and conversion to int?
1038 addTokenValue(fValueStack.top(), kAccumulator);
1041 SkASSERT(fAccumulatorType == SkOperand2::kS32);
1043 // if 'and', write beq goto opcode after end of predicate (after to bool)
1044 // if 'or', write bne goto to bool
1045 addToken(op == kLogicalAnd ? kLogicalAndInt : kLogicalOrInt);
1046 Branch branch(op, fOpStack.count(), getTokenOffset());
1047 addTokenInt(0); // placeholder for future branch
1048 oldTop.fPrimed = wasPrime;
1049 oldTop.fDone = wasDone;
1050 *fBranchStack.push() = branch;
1051 fAccumulatorType = SkOperand2::kNoType;
1058 bool SkScriptEngine2::processOp() {
1061 op = (Op) (op & ~kArtificialOp);
1062 const OperatorAttributes* attributes = &gOpAttributes[op];
1063 SkScriptValue2 value1;
1064 memset(&value1, 0, sizeof(SkScriptValue2));
1065 SkScriptValue2 value2;
1066 fValueStack.pop(&value2);
1067 value2.fIsWritten = SkScriptValue2::kUnwritten;
1068 // SkScriptEngine2::SkTypeOp convert1[3];
1069 // SkScriptEngine2::SkTypeOp convert2[3];
1070 // SkScriptEngine2::SkTypeOp* convert2Ptr = convert2;
1071 bool constantOperands = value2.fIsConstant == SkScriptValue2::kConstant;
1072 if (attributes->fLeftType != SkOperand2::kNoType) {
1073 fValueStack.pop(&value1);
1074 constantOperands &= value1.fIsConstant == SkScriptValue2::kConstant;
1075 value1.fIsWritten = SkScriptValue2::kUnwritten;
1076 if (op == kFlipOps) {
1077 SkTSwap(value1, value2);
1079 op = (Op) (op & ~kArtificialOp);
1080 attributes = &gOpAttributes[op];
1081 if (constantOperands == false)
1082 addToken(kFlipOpsOp);
1084 if (value1.fType == SkOperand2::kObject && (value1.fType & attributes->fLeftType) == 0) {
1085 value1.fType = getUnboxType(value1.fOperand);
1086 addToken(kUnboxToken);
1089 if (value2.fType == SkOperand2::kObject && (value2.fType & attributes->fLeftType) == 0) {
1090 value1.fType = getUnboxType(value2.fOperand);
1091 addToken(kUnboxToken2);
1093 if (attributes->fLeftType != SkOperand2::kNoType) {
1094 if (value1.fType != value2.fType) {
1095 if ((attributes->fLeftType & SkOperand2::kString) && attributes->fBias & kTowardsString &&
1096 ((value1.fType | value2.fType) & SkOperand2::kString)) {
1097 if (value1.fType == SkOperand2::kS32 || value1.fType == SkOperand2::kScalar) {
1098 addTokenConst(&value1, kAccumulator, SkOperand2::kString,
1099 value1.fType == SkOperand2::kS32 ? kIntToString : kScalarToString);
1101 if (value2.fType == SkOperand2::kS32 || value2.fType == SkOperand2::kScalar) {
1102 addTokenConst(&value2, kOperand, SkOperand2::kString,
1103 value2.fType == SkOperand2::kS32 ? kIntToString2 : kScalarToString2);
1105 } else if (attributes->fLeftType & SkOperand2::kScalar && ((value1.fType | value2.fType) &
1106 SkOperand2::kScalar)) {
1107 if (value1.fType == SkOperand2::kS32)
1108 addTokenConst(&value1, kAccumulator, SkOperand2::kScalar, kIntToScalar);
1109 if (value2.fType == SkOperand2::kS32)
1110 addTokenConst(&value2, kOperand, SkOperand2::kScalar, kIntToScalar2);
1113 if ((value1.fType & attributes->fLeftType) == 0 || value1.fType != value2.fType) {
1114 if (value1.fType == SkOperand2::kString)
1115 addTokenConst(&value1, kAccumulator, SkOperand2::kScalar, kStringToScalar);
1116 if (value1.fType == SkOperand2::kScalar && (attributes->fLeftType == SkOperand2::kS32 ||
1117 value2.fType == SkOperand2::kS32))
1118 addTokenConst(&value1, kAccumulator, SkOperand2::kS32, kScalarToInt);
1121 AddTokenRegister rhRegister = attributes->fLeftType != SkOperand2::kNoType ?
1122 kOperand : kAccumulator;
1123 if ((value2.fType & attributes->fRightType) == 0 || value1.fType != value2.fType) {
1124 if (value2.fType == SkOperand2::kString)
1125 addTokenConst(&value2, rhRegister, SkOperand2::kScalar, kStringToScalar2);
1126 if (value2.fType == SkOperand2::kScalar && (attributes->fRightType == SkOperand2::kS32 ||
1127 value1.fType == SkOperand2::kS32))
1128 addTokenConst(&value2, rhRegister, SkOperand2::kS32, kScalarToInt2);
1130 TypeOp typeOp = gTokens[op];
1131 if (value2.fType == SkOperand2::kScalar)
1132 typeOp = (TypeOp) (typeOp + 1);
1133 else if (value2.fType == SkOperand2::kString)
1134 typeOp = (TypeOp) (typeOp + 2);
1135 SkDynamicMemoryWStream stream;
1136 SkOperand2::OpType saveType = SkOperand2::kNoType;
1137 SkBool saveOperand = false;
1138 if (constantOperands) {
1139 fActiveStream = &stream;
1140 saveType = fAccumulatorType;
1141 saveOperand = fOperandInUse;
1142 fAccumulatorType = SkOperand2::kNoType;
1143 fOperandInUse = false;
1145 if (attributes->fLeftType != SkOperand2::kNoType) { // two operands
1146 if (value1.fIsWritten == SkScriptValue2::kUnwritten)
1147 addTokenValue(value1, kAccumulator);
1149 if (value2.fIsWritten == SkScriptValue2::kUnwritten)
1150 addTokenValue(value2, rhRegister);
1152 if (constantOperands) {
1154 SkAutoDataUnref data(fStream.copyToData());
1156 decompile(data->bytes(), data->size());
1158 SkScriptRuntime runtime(fCallBackArray);
1159 runtime.executeTokens((unsigned char*)data->bytes());
1160 runtime.getResult(&value1.fOperand);
1161 if (attributes->fResultIsBoolean == kResultIsBoolean)
1162 value1.fType = SkOperand2::kS32;
1163 else if (attributes->fLeftType == SkOperand2::kNoType) // unary operand
1164 value1.fType = value2.fType;
1165 fValueStack.push(value1);
1166 if (value1.fType == SkOperand2::kString)
1167 runtime.untrack(value1.fOperand.fString);
1168 else if (value1.fType == SkOperand2::kArray)
1169 runtime.untrack(value1.fOperand.fArray);
1170 fActiveStream = &fStream;
1171 fAccumulatorType = saveType;
1172 fOperandInUse = saveOperand;
1175 value2.fIsConstant = SkScriptValue2::kVariable;
1176 fValueStack.push(value2);
1180 void SkScriptEngine2::Branch::resolve(SkDynamicMemoryWStream* stream, size_t off) {
1181 SkASSERT(fDone == kIsNotDone);
1182 fPrimed = kIsNotPrimed;
1184 SkASSERT(off > fOffset + sizeof(size_t));
1185 size_t offset = off - fOffset - sizeof(offset);
1186 stream->write(&offset, fOffset, sizeof(offset));
1189 void SkScriptEngine2::resolveBranch(SkScriptEngine2::Branch& branch) {
1190 branch.resolve(fActiveStream, getTokenOffset());
1193 bool SkScriptEngine2::ConvertTo(SkScriptEngine2* engine, SkOperand2::OpType toType, SkScriptValue2* value ) {
1195 SkOperand2::OpType type = value->fType;
1198 SkOperand2& operand = value->fOperand;
1199 bool success = true;
1201 case SkOperand2::kS32:
1202 if (type == SkOperand2::kScalar)
1203 operand.fS32 = SkScalarFloorToInt(operand.fScalar);
1205 SkASSERT(type == SkOperand2::kString);
1206 success = SkParse::FindS32(operand.fString->c_str(), &operand.fS32) != NULL;
1209 case SkOperand2::kScalar:
1210 if (type == SkOperand2::kS32)
1211 operand.fScalar = IntToScalar(operand.fS32);
1213 SkASSERT(type == SkOperand2::kString);
1214 success = SkParse::FindScalar(operand.fString->c_str(), &operand.fScalar) != NULL;
1217 case SkOperand2::kString: {
1218 SkString* strPtr = new SkString();
1220 engine->track(strPtr);
1221 if (type == SkOperand2::kS32)
1222 strPtr->appendS32(operand.fS32);
1224 SkASSERT(type == SkOperand2::kScalar);
1225 strPtr->appendScalar(operand.fScalar);
1227 operand.fString = strPtr;
1229 case SkOperand2::kArray: {
1230 SkOpArray* array = new SkOpArray(type);
1231 *array->append() = operand;
1232 engine->track(array);
1233 operand.fArray = array;
1238 value->fType = toType;
1242 SkScalar SkScriptEngine2::IntToScalar(int32_t s32) {
1244 if (s32 == (int32_t) SK_NaN32)
1245 scalar = SK_ScalarNaN;
1246 else if (SkAbs32(s32) == SK_MaxS32)
1247 scalar = SkSign32(s32) * SK_ScalarMax;
1249 scalar = SkIntToScalar(s32);
1253 bool SkScriptEngine2::ValueToString(const SkScriptValue2& value, SkString* string) {
1254 switch (value.fType) {
1255 case SkOperand2::kS32:
1257 string->appendS32(value.fOperand.fS32);
1259 case SkOperand2::kScalar:
1261 string->appendScalar(value.fOperand.fScalar);
1263 case SkOperand2::kString:
1264 string->set(*value.fOperand.fString);
1270 return true; // no error
1274 #if defined(SK_SUPPORT_UNITTEST)
1276 #define testInt(expression) { #expression, SkOperand2::kS32, expression, 0, NULL }
1277 #define testScalar(expression) { #expression, SkOperand2::kScalar, 0, (float) (expression), NULL }
1278 #define testRemainder(exp1, exp2) { #exp1 "%" #exp2, SkOperand2::kScalar, 0, fmodf((float) exp1, (float) exp2), NULL }
1279 #define testTrue(expression) { #expression, SkOperand2::kS32, 1, 0, NULL }
1280 #define testFalse(expression) { #expression, SkOperand2::kS32, 0, 0, NULL }
1282 static const SkScriptNAnswer2 scriptTests[] = {
1284 testScalar(- -5.5- -1.5),
1288 testScalar(1.0+2.0),
1289 testScalar(3.0-1.0),
1295 testRemainder(9.5, 0.5),
1296 testRemainder(9.,2),
1297 testRemainder(9,2.5),
1298 testRemainder(-9,2.5),
1300 testTrue(-9.==-4.0-5),
1301 testTrue(-9.*1==-4-5),
1302 testFalse(-9!=-9.0),
1303 testFalse(-9.!=-4.0-5),
1304 testFalse(-9.*1!=-4-5),
1307 testInt(0xdeadBEEF),
1308 { "'123'+\"456\"", SkOperand2::kString, 0, 0, "123456" },
1309 { "123+\"456\"", SkOperand2::kString, 0, 0, "123456" },
1310 { "'123'+456", SkOperand2::kString, 0, 0, "123456" },
1311 { "'123'|\"456\"", SkOperand2::kS32, 123|456, 0, NULL },
1312 { "123|\"456\"", SkOperand2::kS32, 123|456, 0, NULL },
1313 { "'123'|456", SkOperand2::kS32, 123|456, 0, NULL },
1314 { "'2'<11", SkOperand2::kS32, 1, 0, NULL },
1315 { "2<'11'", SkOperand2::kS32, 1, 0, NULL },
1316 { "'2'<'11'", SkOperand2::kS32, 0, 0, NULL },
1355 // left int, right scalar
1374 // left scalar, right int
1411 // int, string (string is int)
1417 testFalse(20<='11'),
1428 // int, string (string is scalar)
1431 testFalse(20<'11.'),
1433 testFalse(2=='11.'),
1437 testFalse(20.<'11.'),
1439 testFalse(2.=='11.'),
1449 testFalse('20'<11.),
1451 testFalse('2'==11.),
1454 testFalse('2'<'11'),
1455 testFalse('20'<'11'),
1457 testFalse('2'=='11'),
1468 , { "123.5", SkOperand2::kScalar, 0, SkIntToScalar(123) + SK_Scalar1/2, NULL }
1471 #define SkScriptNAnswer_testCount SK_ARRAY_COUNT(scriptTests)
1472 #endif // SK_SUPPORT_UNITTEST
1474 void SkScriptEngine2::UnitTest() {
1475 #if defined(SK_SUPPORT_UNITTEST)
1476 ValidateDecompileTable();
1477 for (size_t index = 0; index < SkScriptNAnswer_testCount; index++) {
1478 SkScriptEngine2 engine(scriptTests[index].fType);
1479 SkScriptValue2 value;
1480 const char* script = scriptTests[index].fScript;
1481 const char* scriptPtr = script;
1482 SkASSERT(engine.evaluateScript(&scriptPtr, &value) == true);
1483 SkASSERT(value.fType == scriptTests[index].fType);
1485 switch (value.fType) {
1486 case SkOperand2::kS32:
1487 if (value.fOperand.fS32 != scriptTests[index].fIntAnswer)
1488 SkDEBUGF(("script '%s' == value %d != expected answer %d\n", script, value.fOperand.fS32, scriptTests[index].fIntAnswer));
1489 SkASSERT(value.fOperand.fS32 == scriptTests[index].fIntAnswer);
1491 case SkOperand2::kScalar:
1492 error = SkScalarAbs(value.fOperand.fScalar - scriptTests[index].fScalarAnswer);
1493 if (error >= SK_Scalar1 / 10000)
1494 SkDEBUGF(("script '%s' == value %g != expected answer %g\n", script, value.fOperand.fScalar / (1.0f * SK_Scalar1), scriptTests[index].fScalarAnswer / (1.0f * SK_Scalar1)));
1495 SkASSERT(error < SK_Scalar1 / 10000);
1497 case SkOperand2::kString:
1498 SkASSERT(value.fOperand.fString->equals(scriptTests[index].fStringAnswer));
1504 #endif // SK_SUPPORT_UNITTEST