The Tor Browser: gfx/skia/trunk/src/animator/SkScript.cpp@a63d609f5ebe (annotated)

gfx/skia/trunk/src/animator/SkScript.cpp@a63d609f5ebe (annotated)

gfx/skia/trunk/src/animator/SkScript.cpp

Thu, 15 Jan 2015 15:55:04 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 15 Jan 2015 15:55:04 +0100
branch: TOR_BUG_9701
changeset 9: a63d609f5ebe
permissions: -rw-r--r--

Back out 97036ab72558 which inappropriately compared turds to third parties.

 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #include "SkScript.h"
 #include "SkMath.h"
 #include "SkParse.h"
 #include "SkString.h"
 #include "SkTypedArray.h"
 /* things to do
     ? re-enable support for struct literals (e.g., for initializing points or rects)
         {x:1, y:2}
     ? use standard XML / script notation like document.getElementById("canvas");
     finish support for typed arrays
         ? allow indexing arrays by string
             this could map to the 'name' attribute of a given child of an array
         ? allow multiple types in the array
     remove SkDisplayType.h  // from SkOperand.h
     merge type and operand arrays into scriptvalue array
 */
 #ifdef SK_DEBUG
 static const char* errorStrings[] = {
         "array index of out bounds", // kArrayIndexOutOfBounds
         "could not find reference id", // kCouldNotFindReferencedID
         "dot operator expects object", // kDotOperatorExpectsObject
         "error in array index", // kErrorInArrrayIndex
         "error in function parameters", // kErrorInFunctionParameters
         "expected array", // kExpectedArray
         "expected boolean expression", // kExpectedBooleanExpression
         "expected field name", // kExpectedFieldName
         "expected hex", // kExpectedHex
         "expected int for condition operator", // kExpectedIntForConditionOperator
         "expected number", // kExpectedNumber
         "expected number for array index", // kExpectedNumberForArrayIndex
         "expected operator", // kExpectedOperator
         "expected token", // kExpectedToken
         "expected token before dot operator", // kExpectedTokenBeforeDotOperator
         "expected value", // kExpectedValue
         "handle member failed", // kHandleMemberFailed
         "handle member function failed", // kHandleMemberFunctionFailed
         "handle unbox failed", // kHandleUnboxFailed
         "index out of range", // kIndexOutOfRange
         "mismatched array brace", // kMismatchedArrayBrace
         "mismatched brackets", // kMismatchedBrackets
         "no function handler found", // kNoFunctionHandlerFound
         "premature end", // kPrematureEnd
         "too many parameters", // kTooManyParameters
         "type conversion failed", // kTypeConversionFailed
         "unterminated string" // kUnterminatedString
 };
 #endif
 const SkScriptEngine::SkOperatorAttributes SkScriptEngine::gOpAttributes[] = {
     { kNoType, kNoType, kNoBias }, //   kUnassigned,
     { SkOpType(kInt | kScalar | kString), SkOpType(kInt | kScalar | kString), kTowardsString }, // kAdd
     // kAddInt = kAdd,
     { kNoType, kNoType, kNoBias },  // kAddScalar,
     { kNoType, kNoType, kNoBias },  // kAddString,
     { kNoType, kNoType, kNoBias },  // kArrayOp,
     { kInt, kInt, kNoBias }, // kBitAnd
     { kNoType, kInt, kNoBias }, // kBitNot
     { kInt, kInt, kNoBias }, // kBitOr
     { SkOpType(kInt | kScalar), SkOpType(kInt | kScalar), kNoBias }, // kDivide
     // kDivideInt = kDivide
     { kNoType, kNoType, kNoBias },  // kDivideScalar
     { kNoType, kNoType, kNoBias },  // kElse
     { SkOpType(kInt | kScalar | kString), SkOpType(kInt | kScalar | kString), kTowardsNumber }, // kEqual
     // kEqualInt = kEqual
     { kNoType, kNoType, kNoBias },  // kEqualScalar
     { kNoType, kNoType, kNoBias },  // kEqualString
     { kInt, kNoType, kNoBias },     // kFlipOps
     { SkOpType(kInt | kScalar | kString), SkOpType(kInt | kScalar | kString), kTowardsNumber }, // kGreaterEqual
     // kGreaterEqualInt = kGreaterEqual
     { kNoType, kNoType, kNoBias },  // kGreaterEqualScalar
     { kNoType, kNoType, kNoBias },  // kGreaterEqualString
     { kNoType, kNoType, kNoBias },  // kIf
     { kNoType, kInt, kNoBias }, // kLogicalAnd  (really, ToBool)
     { kNoType, kInt, kNoBias }, // kLogicalNot
     { kInt, kInt, kNoBias }, // kLogicalOr
     { kNoType, SkOpType(kInt | kScalar), kNoBias }, // kMinus
     // kMinusInt = kMinus
     { kNoType, kNoType, kNoBias },  // kMinusScalar
     { SkOpType(kInt | kScalar), SkOpType(kInt | kScalar), kNoBias }, // kModulo
     // kModuloInt = kModulo
     { kNoType, kNoType, kNoBias },  // kModuloScalar
     { SkOpType(kInt | kScalar), SkOpType(kInt | kScalar), kNoBias }, // kMultiply
     // kMultiplyInt = kMultiply
     { kNoType, kNoType, kNoBias },  // kMultiplyScalar
     { kNoType, kNoType, kNoBias },  // kParen
     { kInt, kInt, kNoBias }, // kShiftLeft
     { kInt, kInt, kNoBias }, // kShiftRight
     { SkOpType(kInt | kScalar), SkOpType(kInt | kScalar), kNoBias }, // kSubtract
     // kSubtractInt = kSubtract
     { kNoType, kNoType, kNoBias },  // kSubtractScalar
     { kInt, kInt, kNoBias } // kXor
 };
 // Note that the real precedence for () [] is '2'
 // but here, precedence means 'while an equal or smaller precedence than the current operator
 // is on the stack, process it. This allows 3+5*2 to defer the add until after the multiply
 // is preformed, since the add precedence is not smaller than multiply.
 // But, (3*4 does not process the '(', since brackets are greater than all other precedences
 #define kBracketPrecedence 16
 #define kIfElsePrecedence 15
 const signed char SkScriptEngine::gPrecedence[] = {
         -1, //  kUnassigned,
 , // kAdd,
         // kAddInt = kAdd,
 , // kAddScalar,
 , // kAddString,   // string concat
         kBracketPrecedence, // kArrayOp,
 , // kBitAnd,
 , // kBitNot,
 , // kBitOr,
 , // kDivide,
         // kDivideInt = kDivide,
 , // kDivideScalar,
         kIfElsePrecedence, // kElse,
 , // kEqual,
         // kEqualInt = kEqual,
 , // kEqualScalar,
 , // kEqualString,
         -1, // kFlipOps,
 , // kGreaterEqual,
         // kGreaterEqualInt = kGreaterEqual,
 , // kGreaterEqualScalar,
 , // kGreaterEqualString,
         kIfElsePrecedence, // kIf,
 , // kLogicalAnd,
 , // kLogicalNot,
 , // kLogicalOr,
 , // kMinus,
         // kMinusInt = kMinus,
 , // kMinusScalar,
 , // kModulo,
         // kModuloInt = kModulo,
 , // kModuloScalar,
 , // kMultiply,
         // kMultiplyInt = kMultiply,
 , // kMultiplyScalar,
         kBracketPrecedence, // kParen,
 , // kShiftLeft,
 , // kShiftRight,  // signed
 , // kSubtract,
         // kSubtractInt = kSubtract,
 , // kSubtractScalar,
 , // kXor
 };
 static inline bool is_between(int c, int min, int max)
 {
     return (unsigned)(c - min) <= (unsigned)(max - min);
 }
 static inline bool is_ws(int c)
 {
     return is_between(c, 1, 32);
 }
 static int token_length(const char* start) {
     char ch = start[0];
     if (! is_between(ch, 'a' , 'z') &&  ! is_between(ch, 'A', 'Z') && ch != '_' && ch != '$')
         return -1;
     int length = 0;
     do
         ch = start[++length];
     while (is_between(ch, 'a' , 'z') || is_between(ch, 'A', 'Z') || is_between(ch, '0', '9') ||
         ch == '_' || ch == '$');
     return length;
 }
 SkScriptEngine::SkScriptEngine(SkOpType returnType) :
     fTokenLength(0), fReturnType(returnType), fError(kNoError)
 {
     SkSuppress noInitialSuppress;
     noInitialSuppress.fOperator = kUnassigned;
     noInitialSuppress.fOpStackDepth = 0;
     noInitialSuppress.fSuppress = false;
     noInitialSuppress.fElse = 0;
     fSuppressStack.push(noInitialSuppress);
     *fOpStack.push() = kParen;
     fTrackArray.appendClear();
     fTrackString.appendClear();
 }
 SkScriptEngine::~SkScriptEngine() {
     for (SkString** stringPtr = fTrackString.begin(); stringPtr < fTrackString.end(); stringPtr++)
         delete *stringPtr;
     for (SkTypedArray** arrayPtr = fTrackArray.begin(); arrayPtr < fTrackArray.end(); arrayPtr++)
         delete *arrayPtr;
 }
 int SkScriptEngine::arithmeticOp(char ch, char nextChar, bool lastPush) {
     SkOp op = kUnassigned;
     bool reverseOperands = false;
     bool negateResult = false;
     int advance = 1;
     switch (ch) {
         case '+':
             // !!! ignoring unary plus as implemented here has the side effect of
             // suppressing errors like +"hi"
             if (lastPush == false)  // unary plus, don't push an operator
                 goto returnAdv;
             op = kAdd;
             break;
         case '-':
             op = lastPush ? kSubtract : kMinus;
             break;
         case '*':
             op = kMultiply;
             break;
         case '/':
             op = kDivide;
             break;
         case '>':
             if (nextChar == '>') {
                 op = kShiftRight;
                 goto twoChar;
             }
             op = kGreaterEqual;
             if (nextChar == '=')
                 goto twoChar;
             reverseOperands = negateResult = true;
             break;
         case '<':
             if (nextChar == '<') {
                 op = kShiftLeft;
                 goto twoChar;
             }
             op = kGreaterEqual;
             reverseOperands = nextChar == '=';
             negateResult = ! reverseOperands;
             advance += reverseOperands;
             break;
         case '=':
             if (nextChar == '=') {
                 op = kEqual;
                 goto twoChar;
             }
             break;
         case '!':
             if (nextChar == '=') {
                 op = kEqual;
                 negateResult = true;
 twoChar:
                 advance++;
                 break;
             }
             op = kLogicalNot;
             break;
         case '?':
             op = kIf;
             break;
         case ':':
             op = kElse;
             break;
         case '^':
             op = kXor;
             break;
         case '(':
             *fOpStack.push() = kParen;  // push even if eval is suppressed
             goto returnAdv;
         case '&':
             SkASSERT(nextChar != '&');
             op = kBitAnd;
             break;
         case '|':
             SkASSERT(nextChar != '|');
             op = kBitOr;
             break;
         case '%':
             op = kModulo;
             break;
         case '~':
             op = kBitNot;
             break;
     }
     if (op == kUnassigned)
         return 0;
     if (fSuppressStack.top().fSuppress == false) {
         signed char precedence = gPrecedence[op];
         do {
             int idx = 0;
             SkOp compare;
             do {
                 compare = fOpStack.index(idx);
                 if ((compare & kArtificialOp) == 0)
                     break;
                 idx++;
             } while (true);
             signed char topPrecedence = gPrecedence[compare];
             SkASSERT(topPrecedence != -1);
             if (topPrecedence > precedence || (topPrecedence == precedence &&
                     gOpAttributes[op].fLeftType == kNoType)) {
                 break;
             }
             if (processOp() == false)
                 return 0;   // error
         } while (true);
         if (negateResult)
             *fOpStack.push() = (SkOp) (kLogicalNot | kArtificialOp);
         fOpStack.push(op);
         if (reverseOperands)
             *fOpStack.push() = (SkOp) (kFlipOps | kArtificialOp);
     }
 returnAdv:
     return advance;
 }
 void SkScriptEngine::boxCallBack(_boxCallBack func, void* userStorage) {
     UserCallBack callBack;
     callBack.fBoxCallBack = func;
     commonCallBack(kBox, callBack, userStorage);
 }
 void SkScriptEngine::commonCallBack(CallBackType type, UserCallBack& callBack, void* userStorage) {
     callBack.fCallBackType = type;
     callBack.fUserStorage = userStorage;
     *fUserCallBacks.prepend() = callBack;
 }
 bool SkScriptEngine::convertParams(SkTDArray<SkScriptValue>& params,
         const SkFunctionParamType* paramTypes, int paramCount) {
     if (params.count() > paramCount) {
         fError = kTooManyParameters;
         return false;   // too many parameters passed
     }
     for (int index = 0; index < params.count(); index++) {
         if (convertTo((SkDisplayTypes) paramTypes[index], &params[index]) == false)
             return false;
     }
     return true;
 }
 bool SkScriptEngine::convertTo(SkDisplayTypes toType, SkScriptValue* value ) {
     SkDisplayTypes type = value->fType;
     if (type == toType)
         return true;
     if (ToOpType(type) == kObject) {
 #if 0   // !!! I want object->string to get string from displaystringtype, not id
         if (ToOpType(toType) == kString) {
             bool success = handleObjectToString(value->fOperand.fObject);
             if (success == false)
                 return false;
             SkOpType type;
             fTypeStack.pop(&type);
             value->fType = ToDisplayType(type);
             fOperandStack.pop(&value->fOperand);
             return true;
         }
 #endif
         if (handleUnbox(value) == false) {
             fError = kHandleUnboxFailed;
             return false;
         }
         return convertTo(toType, value);
     }
     return ConvertTo(this, toType, value);
 }
 bool SkScriptEngine::evaluateDot(const char*& script, bool suppressed) {
     size_t fieldLength = token_length(++script);        // skip dot
     if (fieldLength == 0) {
         fError = kExpectedFieldName;
         return false;
     }
     const char* field = script;
     script += fieldLength;
     bool success = handleProperty(suppressed);
     if (success == false) {
         fError = kCouldNotFindReferencedID; // note: never generated by standard animator plugins
         return false;
     }
     return evaluateDotParam(script, suppressed, field, fieldLength);
 }
 bool SkScriptEngine::evaluateDotParam(const char*& script, bool suppressed,
         const char* field, size_t fieldLength) {
     void* object;
     if (suppressed)
         object = NULL;
     else {
         if (fTypeStack.top() != kObject) {
             fError = kDotOperatorExpectsObject;
             return false;
         }
         object = fOperandStack.top().fObject;
         fTypeStack.pop();
         fOperandStack.pop();
     }
     char ch; // see if it is a simple member or a function
     while (is_ws(ch = script[0]))
         script++;
     bool success = true;
     if (ch != '(') {
             if (suppressed == false) {
                 if ((success = handleMember(field, fieldLength, object)) == false)
                     fError = kHandleMemberFailed;
             }
     } else {
         SkTDArray<SkScriptValue> params;
         *fBraceStack.push() = kFunctionBrace;
         success = functionParams(&script, params);
         if (success && suppressed == false &&
                 (success = handleMemberFunction(field, fieldLength, object, params)) == false)
             fError = kHandleMemberFunctionFailed;
     }
     return success;
 }
 bool SkScriptEngine::evaluateScript(const char** scriptPtr, SkScriptValue* value) {
 #ifdef SK_DEBUG
     const char** original = scriptPtr;
 #endif
     bool success;
     const char* inner;
     if (strncmp(*scriptPtr, "#script:", sizeof("#script:") - 1) == 0) {
         *scriptPtr += sizeof("#script:") - 1;
         if (fReturnType == kNoType || fReturnType == kString) {
             success = innerScript(scriptPtr, value);
             if (success == false)
                 goto end;
             inner = value->fOperand.fString->c_str();
             scriptPtr = &inner;
         }
     }
     {
         success = innerScript(scriptPtr, value);
         if (success == false)
             goto end;
         const char* script = *scriptPtr;
         char ch;
         while (is_ws(ch = script[0]))
             script++;
         if (ch != '\0') {
             // error may trigger on scripts like "50,0" that were intended to be written as "[50, 0]"
             fError = kPrematureEnd;
             success = false;
         }
     }
 end:
 #ifdef SK_DEBUG
     if (success == false) {
         SkDebugf("script failed: %s", *original);
         if (fError)
             SkDebugf(" %s", errorStrings[fError - 1]);
         SkDebugf("\n");
     }
 #endif
     return success;
 }
 void SkScriptEngine::forget(SkTypedArray* array) {
     if (array->getType() == SkType_String) {
         for (int index = 0; index < array->count(); index++) {
             SkString* string = (*array)[index].fString;
             int found = fTrackString.find(string);
             if (found >= 0)
                 fTrackString.remove(found);
         }
         return;
     }
     if (array->getType() == SkType_Array) {
         for (int index = 0; index < array->count(); index++) {
             SkTypedArray* child = (*array)[index].fArray;
             forget(child);  // forgets children of child
             int found = fTrackArray.find(child);
             if (found >= 0)
                 fTrackArray.remove(found);
         }
     }
 }
 void SkScriptEngine::functionCallBack(_functionCallBack func, void* userStorage) {
     UserCallBack callBack;
     callBack.fFunctionCallBack = func;
     commonCallBack(kFunction, callBack, userStorage);
 }
 bool SkScriptEngine::functionParams(const char** scriptPtr, SkTDArray<SkScriptValue>& params) {
     (*scriptPtr)++; // skip open paren
     *fOpStack.push() = kParen;
     *fBraceStack.push() = kFunctionBrace;
     SkBool suppressed = fSuppressStack.top().fSuppress;
     do {
         SkScriptValue value;
         bool success = innerScript(scriptPtr, suppressed ? NULL : &value);
         if (success == false) {
             fError = kErrorInFunctionParameters;
             return false;
         }
         if (suppressed)
             continue;
         *params.append() = value;
     } while ((*scriptPtr)[-1] == ',');
     fBraceStack.pop();
     fOpStack.pop(); // pop paren
     (*scriptPtr)++; // advance beyond close paren
     return true;
 }
 #ifdef SK_DEBUG
 bool SkScriptEngine::getErrorString(SkString* str) const {
     if (fError)
         str->set(errorStrings[fError - 1]);
     return fError != 0;
 }
 #endif
 bool SkScriptEngine::innerScript(const char** scriptPtr, SkScriptValue* value) {
     const char* script = *scriptPtr;
     char ch;
     bool lastPush = false;
     bool success = true;
     int opBalance = fOpStack.count();
     int baseBrace = fBraceStack.count();
     int suppressBalance = fSuppressStack.count();
     while ((ch = script[0]) != '\0') {
         if (is_ws(ch)) {
             script++;
             continue;
         }
         SkBool suppressed = fSuppressStack.top().fSuppress;
         SkOperand operand;
         const char* dotCheck;
         if (fBraceStack.count() > baseBrace) {
 #if 0   // disable support for struct brace
             if (ch == ':') {
                 SkASSERT(fTokenLength > 0);
                 SkASSERT(fBraceStack.top() == kStructBrace);
                 ++script;
                 SkASSERT(fDisplayable);
                 SkString token(fToken, fTokenLength);
                 fTokenLength = 0;
                 const char* tokenName = token.c_str();
                 const SkMemberInfo* tokenInfo SK_INIT_TO_AVOID_WARNING;
                 if (suppressed == false) {
                     SkDisplayTypes type = fInfo->getType();
                     tokenInfo = SkDisplayType::GetMember(type, &tokenName);
                     SkASSERT(tokenInfo);
                 }
                 SkScriptValue tokenValue;
                 success = innerScript(&script, &tokenValue);    // terminate and return on comma, close brace
                 SkASSERT(success);
                 if (suppressed == false) {
                     if (tokenValue.fType == SkType_Displayable) {
                         SkASSERT(SkDisplayType::IsDisplayable(tokenInfo->getType()));
                         fDisplayable->setReference(tokenInfo, tokenValue.fOperand.fDisplayable);
                     } else {
                         if (tokenValue.fType != tokenInfo->getType()) {
                             if (convertTo(tokenInfo->getType(), &tokenValue) == false)
                                 return false;
                         }
                         tokenInfo->writeValue(fDisplayable, NULL, 0, 0,
                             (void*) ((char*) fInfo->memberData(fDisplayable) + tokenInfo->fOffset + fArrayOffset),
                             tokenInfo->getType(), tokenValue);
                     }
                 }
                 lastPush = false;
                 continue;
             } else
 #endif
             if (fBraceStack.top() == kArrayBrace) {
                 SkScriptValue tokenValue;
                 success = innerScript(&script, &tokenValue);    // terminate and return on comma, close brace
                 if (success == false) {
                     fError = kErrorInArrrayIndex;
                     return false;
                 }
                 if (suppressed == false) {
 #if 0 // no support for structures for now
                     if (tokenValue.fType == SkType_Structure) {
                         fArrayOffset += (int) fInfo->getSize(fDisplayable);
                     } else
 #endif
                     {
                         SkDisplayTypes type = ToDisplayType(fReturnType);
                         if (fReturnType == kNoType) {
                             // !!! short sighted; in the future, allow each returned array component to carry
                             // its own type, and let caller do any needed conversions
                             if (value->fOperand.fArray->count() == 0)
                                 value->fOperand.fArray->setType(type = tokenValue.fType);
                             else
                                 type = value->fOperand.fArray->getType();
                         }
                         if (tokenValue.fType != type) {
                             if (convertTo(type, &tokenValue) == false)
                                 return false;
                         }
                         *value->fOperand.fArray->append() = tokenValue.fOperand;
                     }
                 }
                 lastPush = false;
                 continue;
             } else {
                 if (token_length(script) == 0) {
                     fError = kExpectedToken;
                     return false;
                 }
             }
         }
         if (lastPush != false && fTokenLength > 0) {
             if (ch == '(') {
                 *fBraceStack.push() = kFunctionBrace;
                 if (handleFunction(&script, SkToBool(suppressed)) == false)
                     return false;
                 lastPush = true;
                 continue;
             } else if (ch == '[') {
                 if (handleProperty(SkToBool(suppressed)) == false)
                     return false;   // note: never triggered by standard animator plugins
                 if (handleArrayIndexer(&script, SkToBool(suppressed)) == false)
                     return false;
                 lastPush = true;
                 continue;
             } else if (ch != '.') {
                 if (handleProperty(SkToBool(suppressed)) == false)
                     return false;   // note: never triggered by standard animator plugins
                 lastPush = true;
                 continue;
             }
         }
         if (ch == '0' && (script[1] & ~0x20) == 'X') {
             if (lastPush != false) {
                 fError = kExpectedOperator;
                 return false;
             }
             script += 2;
             script = SkParse::FindHex(script, (uint32_t*)&operand.fS32);
             if (script == NULL) {
                 fError = kExpectedHex;
                 return false;
             }
             goto intCommon;
         }
         if (lastPush == false && ch == '.')
             goto scalarCommon;
         if (ch >= '0' && ch <= '9') {
             if (lastPush != false) {
                 fError = kExpectedOperator;
                 return false;
             }
             dotCheck = SkParse::FindS32(script, &operand.fS32);
             if (dotCheck[0] != '.') {
                 script = dotCheck;
 intCommon:
                 if (suppressed == false)
                     *fTypeStack.push() = kInt;
             } else {
 scalarCommon:
                 script = SkParse::FindScalar(script, &operand.fScalar);
                 if (suppressed == false)
                     *fTypeStack.push() = kScalar;
             }
             if (suppressed == false)
                 fOperandStack.push(operand);
             lastPush = true;
             continue;
         }
         int length = token_length(script);
         if (length > 0) {
             if (lastPush != false) {
                 fError = kExpectedOperator;
                 return false;
             }
             fToken = script;
             fTokenLength = length;
             script += length;
             lastPush = true;
             continue;
         }
         char startQuote = ch;
         if (startQuote == '\'' || startQuote == '\"') {
             if (lastPush != false) {
                 fError = kExpectedOperator;
                 return false;
             }
             operand.fString = new SkString();
             track(operand.fString);
             ++script;
             // <mrr> this is a lot of calls to append() one char at at time
             // how hard to preflight script so we know how much to grow fString by?
             do {
                 if (script[0] == '\\')
                     ++script;
                 operand.fString->append(script, 1);
                 ++script;
                 if (script[0] == '\0') {
                     fError = kUnterminatedString;
                     return false;
                 }
             } while (script[0] != startQuote);
             ++script;
             if (suppressed == false) {
                 *fTypeStack.push() = kString;
                 fOperandStack.push(operand);
             }
             lastPush = true;
             continue;
         }
         ;
         if (ch ==  '.') {
             if (fTokenLength == 0) {
                 SkScriptValue scriptValue;
                 SkDEBUGCODE(scriptValue.fOperand.fObject = NULL);
                 int tokenLength = token_length(++script);
                 const char* token = script;
                 script += tokenLength;
                 if (suppressed == false) {
                     if (fTypeStack.count() == 0) {
                         fError = kExpectedTokenBeforeDotOperator;
                         return false;
                     }
                     SkOpType topType;
                     fTypeStack.pop(&topType);
                     fOperandStack.pop(&scriptValue.fOperand);
                     scriptValue.fType = ToDisplayType(topType);
                     handleBox(&scriptValue);
                 }
                 success = evaluateDotParam(script, SkToBool(suppressed), token, tokenLength);
                 if (success == false)
                     return false;
                 lastPush = true;
                 continue;
             }
             // get next token, and evaluate immediately
             success = evaluateDot(script, SkToBool(suppressed));
             if (success == false)
                 return false;
             lastPush = true;
             continue;
         }
         if (ch == '[') {
             if (lastPush == false) {
                 script++;
                 *fBraceStack.push() = kArrayBrace;
                 if (suppressed)
                     continue;
                 operand.fArray = value->fOperand.fArray = new SkTypedArray(ToDisplayType(fReturnType));
                 track(value->fOperand.fArray);
                 *fTypeStack.push() = (SkOpType) kArray;
                 fOperandStack.push(operand);
                 continue;
             }
             if (handleArrayIndexer(&script, SkToBool(suppressed)) == false)
                 return false;
             lastPush = true;
             continue;
         }
 #if 0 // structs not supported for now
         if (ch == '{') {
             if (lastPush == false) {
                 script++;
                 *fBraceStack.push() = kStructBrace;
                 if (suppressed)
                     continue;
                 operand.fS32 = 0;
                 *fTypeStack.push() = (SkOpType) kStruct;
                 fOperandStack.push(operand);
                 continue;
             }
             SkASSERT(0); // braces in other contexts aren't supported yet
         }
 #endif
         if (ch == ')' && fBraceStack.count() > 0) {
             SkBraceStyle braceStyle = fBraceStack.top();
             if (braceStyle == kFunctionBrace) {
                 fBraceStack.pop();
                 break;
             }
         }
         if (ch == ',' || ch == ']') {
             if (ch != ',') {
                 SkBraceStyle match;
                 fBraceStack.pop(&match);
                 if (match != kArrayBrace) {
                     fError = kMismatchedArrayBrace;
                     return false;
                 }
             }
             script++;
             // !!! see if brace or bracket is correct closer
             break;
         }
         char nextChar = script[1];
         int advance = logicalOp(ch, nextChar);
         if (advance < 0)     // error
             return false;
         if (advance == 0)
             advance = arithmeticOp(ch, nextChar, lastPush);
         if (advance == 0) // unknown token
             return false;
         if (advance > 0)
             script += advance;
         lastPush = ch == ']' || ch == ')';
     }
     bool suppressed = SkToBool(fSuppressStack.top().fSuppress);
     if (fTokenLength > 0) {
         success = handleProperty(suppressed);
         if (success == false)
             return false;   // note: never triggered by standard animator plugins
     }
     while (fOpStack.count() > opBalance) {   // leave open paren
         if ((fError = opError()) != kNoError)
             return false;
         if (processOp() == false)
             return false;
     }
     SkOpType topType = fTypeStack.count() > 0 ? fTypeStack.top() : kNoType;
     if (suppressed == false && topType != fReturnType &&
             topType == kString && fReturnType != kNoType) { // if result is a string, give handle property a chance to convert it to the property value
         SkString* string = fOperandStack.top().fString;
         fToken = string->c_str();
         fTokenLength = string->size();
         fOperandStack.pop();
         fTypeStack.pop();
         success = handleProperty(SkToBool(fSuppressStack.top().fSuppress));
         if (success == false) { // if it couldn't convert, return string (error?)
             SkOperand operand;
             operand.fS32 = 0;
             *fTypeStack.push() = kString;
             operand.fString = string;
             fOperandStack.push(operand);
         }
     }
     if (value) {
         if (fOperandStack.count() == 0)
             return false;
         SkASSERT(fOperandStack.count() >= 1);
         SkASSERT(fTypeStack.count() >= 1);
         fOperandStack.pop(&value->fOperand);
         SkOpType type;
         fTypeStack.pop(&type);
         value->fType = ToDisplayType(type);
 //      SkASSERT(value->fType != SkType_Unknown);
         if (topType != fReturnType && topType == kObject && fReturnType != kNoType) {
             if (convertTo(ToDisplayType(fReturnType), value) == false)
                 return false;
         }
     }
     while (fSuppressStack.count() > suppressBalance)
         fSuppressStack.pop();
     *scriptPtr = script;
     return true; // no error
 }
 void SkScriptEngine::memberCallBack(_memberCallBack member , void* userStorage) {
     UserCallBack callBack;
     callBack.fMemberCallBack = member;
     commonCallBack(kMember, callBack, userStorage);
 }
 void SkScriptEngine::memberFunctionCallBack(_memberFunctionCallBack func, void* userStorage) {
     UserCallBack callBack;
     callBack.fMemberFunctionCallBack = func;
     commonCallBack(kMemberFunction, callBack, userStorage);
 }
 #if 0
 void SkScriptEngine::objectToStringCallBack(_objectToStringCallBack func, void* userStorage) {
     UserCallBack callBack;
     callBack.fObjectToStringCallBack = func;
     commonCallBack(kObjectToString, callBack, userStorage);
 }
 #endif
 bool SkScriptEngine::handleArrayIndexer(const char** scriptPtr, bool suppressed) {
     SkScriptValue scriptValue;
     (*scriptPtr)++;
     *fOpStack.push() = kParen;
     *fBraceStack.push() = kArrayBrace;
     SkOpType saveType = fReturnType;
     fReturnType = kInt;
     bool success = innerScript(scriptPtr, suppressed == false ? &scriptValue : NULL);
     if (success == false)
         return false;
     fReturnType = saveType;
     if (suppressed == false) {
         if (convertTo(SkType_Int, &scriptValue) == false)
             return false;
         int index = scriptValue.fOperand.fS32;
         SkScriptValue scriptValue;
         SkOpType type;
         fTypeStack.pop(&type);
         fOperandStack.pop(&scriptValue.fOperand);
         scriptValue.fType = ToDisplayType(type);
         if (type == kObject) {
             success = handleUnbox(&scriptValue);
             if (success == false)
                 return false;
             if (ToOpType(scriptValue.fType) != kArray) {
                 fError = kExpectedArray;
                 return false;
             }
         }
         *fTypeStack.push() = scriptValue.fOperand.fArray->getOpType();
 //      SkASSERT(index >= 0);
         if ((unsigned) index >= (unsigned) scriptValue.fOperand.fArray->count()) {
             fError = kArrayIndexOutOfBounds;
             return false;
         }
         scriptValue.fOperand = scriptValue.fOperand.fArray->begin()[index];
         fOperandStack.push(scriptValue.fOperand);
     }
     fOpStack.pop(); // pop paren
     return success;
 }
 bool SkScriptEngine::handleBox(SkScriptValue* scriptValue) {
     bool success = true;
     for (UserCallBack* callBack = fUserCallBacks.begin(); callBack < fUserCallBacks.end(); callBack++) {
         if (callBack->fCallBackType != kBox)
             continue;
         success = (*callBack->fBoxCallBack)(callBack->fUserStorage, scriptValue);
         if (success) {
             fOperandStack.push(scriptValue->fOperand);
             *fTypeStack.push() = ToOpType(scriptValue->fType);
             goto done;
         }
     }
 done:
     return success;
 }
 bool SkScriptEngine::handleFunction(const char** scriptPtr, bool suppressed) {
     SkScriptValue callbackResult;
     SkTDArray<SkScriptValue> params;
     SkString functionName(fToken, fTokenLength);
     fTokenLength = 0;
     bool success = functionParams(scriptPtr, params);
     if (success == false)
         goto done;
     if (suppressed == true)
         return true;
     {
         for (UserCallBack* callBack = fUserCallBacks.begin(); callBack < fUserCallBacks.end(); callBack++) {
             if (callBack->fCallBackType != kFunction)
                 continue;
             success = (*callBack->fFunctionCallBack)(functionName.c_str(), functionName.size(), params,
                 callBack->fUserStorage, &callbackResult);
             if (success) {
                 fOperandStack.push(callbackResult.fOperand);
                 *fTypeStack.push() = ToOpType(callbackResult.fType);
                 goto done;
             }
         }
     }
     fError = kNoFunctionHandlerFound;
     return false;
 done:
     return success;
 }
 bool SkScriptEngine::handleMember(const char* field, size_t len, void* object) {
     SkScriptValue callbackResult;
     bool success = true;
     for (UserCallBack* callBack = fUserCallBacks.begin(); callBack < fUserCallBacks.end(); callBack++) {
         if (callBack->fCallBackType != kMember)
             continue;
         success = (*callBack->fMemberCallBack)(field, len, object, callBack->fUserStorage, &callbackResult);
         if (success) {
             if (callbackResult.fType == SkType_String)
                 track(callbackResult.fOperand.fString);
             fOperandStack.push(callbackResult.fOperand);
             *fTypeStack.push() = ToOpType(callbackResult.fType);
             goto done;
         }
     }
     return false;
 done:
     return success;
 }
 bool SkScriptEngine::handleMemberFunction(const char* field, size_t len, void* object, SkTDArray<SkScriptValue>& params) {
     SkScriptValue callbackResult;
     bool success = true;
     for (UserCallBack* callBack = fUserCallBacks.begin(); callBack < fUserCallBacks.end(); callBack++) {
         if (callBack->fCallBackType != kMemberFunction)
             continue;
         success = (*callBack->fMemberFunctionCallBack)(field, len, object, params,
             callBack->fUserStorage, &callbackResult);
         if (success) {
             if (callbackResult.fType == SkType_String)
                 track(callbackResult.fOperand.fString);
             fOperandStack.push(callbackResult.fOperand);
             *fTypeStack.push() = ToOpType(callbackResult.fType);
             goto done;
         }
     }
     return false;
 done:
     return success;
 }
 #if 0
 bool SkScriptEngine::handleObjectToString(void* object) {
     SkScriptValue callbackResult;
     bool success = true;
     for (UserCallBack* callBack = fUserCallBacks.begin(); callBack < fUserCallBacks.end(); callBack++) {
         if (callBack->fCallBackType != kObjectToString)
             continue;
         success = (*callBack->fObjectToStringCallBack)(object,
             callBack->fUserStorage, &callbackResult);
         if (success) {
             if (callbackResult.fType == SkType_String)
                 track(callbackResult.fOperand.fString);
             fOperandStack.push(callbackResult.fOperand);
             *fTypeStack.push() = ToOpType(callbackResult.fType);
             goto done;
         }
     }
     return false;
 done:
     return success;
 }
 #endif
 bool SkScriptEngine::handleProperty(bool suppressed) {
     SkScriptValue callbackResult;
     bool success = true;
     if (suppressed)
         goto done;
     success = false; // note that with standard animator-script plugins, callback never returns false
     {
         for (UserCallBack* callBack = fUserCallBacks.begin(); callBack < fUserCallBacks.end(); callBack++) {
             if (callBack->fCallBackType != kProperty)
                 continue;
             success = (*callBack->fPropertyCallBack)(fToken, fTokenLength,
                 callBack->fUserStorage, &callbackResult);
             if (success) {
                 if (callbackResult.fType == SkType_String && callbackResult.fOperand.fString == NULL) {
                     callbackResult.fOperand.fString = new SkString(fToken, fTokenLength);
                     track(callbackResult.fOperand.fString);
                 }
                 fOperandStack.push(callbackResult.fOperand);
                 *fTypeStack.push() = ToOpType(callbackResult.fType);
                 goto done;
             }
         }
     }
 done:
     fTokenLength = 0;
     return success;
 }
 bool SkScriptEngine::handleUnbox(SkScriptValue* scriptValue) {
     bool success = true;
     for (UserCallBack* callBack = fUserCallBacks.begin(); callBack < fUserCallBacks.end(); callBack++) {
         if (callBack->fCallBackType != kUnbox)
             continue;
         success = (*callBack->fUnboxCallBack)(callBack->fUserStorage, scriptValue);
         if (success) {
             if (scriptValue->fType == SkType_String)
                 track(scriptValue->fOperand.fString);
             goto done;
         }
     }
     return false;
 done:
     return success;
 }
 // note that entire expression is treated as if it were enclosed in parens
 // an open paren is always the first thing in the op stack
 int SkScriptEngine::logicalOp(char ch, char nextChar) {
     int advance = 1;
     SkOp match;
     signed char precedence;
     switch (ch) {
         case ')':
             match = kParen;
             break;
         case ']':
             match = kArrayOp;
             break;
         case '?':
             match = kIf;
             break;
         case ':':
             match = kElse;
             break;
         case '&':
             if (nextChar != '&')
                 goto noMatch;
             match = kLogicalAnd;
             advance = 2;
             break;
         case '|':
             if (nextChar != '|')
                 goto noMatch;
             match = kLogicalOr;
             advance = 2;
             break;
         default:
 noMatch:
             return 0;
     }
     SkSuppress suppress;
     precedence = gPrecedence[match];
     if (fSuppressStack.top().fSuppress) {
         if (fSuppressStack.top().fOpStackDepth < fOpStack.count()) {
             SkOp topOp = fOpStack.top();
             if (gPrecedence[topOp] <= precedence)
                 fOpStack.pop();
             goto goHome;
         }
         bool changedPrecedence = gPrecedence[fSuppressStack.top().fOperator] < precedence;
         if (changedPrecedence)
             fSuppressStack.pop();
         if (precedence == kIfElsePrecedence) {
             if (match == kIf) {
                 if (changedPrecedence)
                     fOpStack.pop();
                 else
                     *fOpStack.push() = kIf;
             } else {
                 if (fSuppressStack.top().fOpStackDepth == fOpStack.count()) {
                     goto flipSuppress;
                 }
                 fOpStack.pop();
             }
         }
         if (changedPrecedence == false)
             goto goHome;
     }
     while (gPrecedence[fOpStack.top() & ~kArtificialOp] < precedence) {
         if (processOp() == false)
             return false;
     }
     if (fSuppressStack.top().fOpStackDepth > fOpStack.count())
         fSuppressStack.pop();
     switch (match) {
         case kParen:
         case kArrayOp:
             if (fOpStack.count() <= 1 || fOpStack.top() != match) {
                 fError = kMismatchedBrackets;
                 return -1;
             }
             if (match == kParen)
                 fOpStack.pop();
             else {
                 SkOpType indexType;
                 fTypeStack.pop(&indexType);
                 if (indexType != kInt && indexType != kScalar) {
                     fError = kExpectedNumberForArrayIndex; // (although, could permit strings eventually)
                     return -1;
                 }
                 SkOperand indexOperand;
                 fOperandStack.pop(&indexOperand);
                 int index = indexType == kScalar ? SkScalarFloorToInt(indexOperand.fScalar) :
                     indexOperand.fS32;
                 SkOpType arrayType;
                 fTypeStack.pop(&arrayType);
                 if ((unsigned)arrayType != (unsigned)kArray) {
                     fError = kExpectedArray;
                     return -1;
                 }
                 SkOperand arrayOperand;
                 fOperandStack.pop(&arrayOperand);
                 SkTypedArray* array = arrayOperand.fArray;
                 SkOperand operand;
                 if (array->getIndex(index, &operand) == false) {
                     fError = kIndexOutOfRange;
                     return -1;
                 }
                 SkOpType resultType = array->getOpType();
                 fTypeStack.push(resultType);
                 fOperandStack.push(operand);
             }
             break;
         case kIf: {
             SkScriptValue ifValue;
             SkOpType ifType;
             fTypeStack.pop(&ifType);
             ifValue.fType = ToDisplayType(ifType);
             fOperandStack.pop(&ifValue.fOperand);
             if (convertTo(SkType_Int, &ifValue) == false)
                 return -1;
             if (ifValue.fType != SkType_Int) {
                 fError = kExpectedIntForConditionOperator;
                 return -1;
             }
             suppress.fSuppress = ifValue.fOperand.fS32 == 0;
             suppress.fOperator = kIf;
             suppress.fOpStackDepth = fOpStack.count();
             suppress.fElse = false;
             fSuppressStack.push(suppress);
             // if left is true, do only up to colon
             // if left is false, do only after colon
             } break;
         case kElse:
 flipSuppress:
             if (fSuppressStack.top().fElse)
                 fSuppressStack.pop();
             fSuppressStack.top().fElse = true;
             fSuppressStack.top().fSuppress ^= true;
             // flip last do / don't do consideration from last '?'
             break;
         case kLogicalAnd:
         case kLogicalOr: {
             if (fTypeStack.top() != kInt) {
                 fError = kExpectedBooleanExpression;
                 return -1;
             }
             int32_t topInt = fOperandStack.top().fS32;
             if (fOpStack.top() != kLogicalAnd)
                 *fOpStack.push() = kLogicalAnd; // really means 'to bool', and is appropriate for 'or'
             if (match == kLogicalOr ? topInt != 0 : topInt == 0) {
                 suppress.fSuppress = true;
                 suppress.fOperator = match;
                 suppress.fOpStackDepth = fOpStack.count();
                 suppress.fElse = false;
                 fSuppressStack.push(suppress);
             } else {
                 fTypeStack.pop();
                 fOperandStack.pop();
             }
         }   break;
         default:
             SkASSERT(0);
     }
 goHome:
     return advance;
 }
 SkScriptEngine::Error SkScriptEngine::opError() {
     int opCount = fOpStack.count();
     int operandCount = fOperandStack.count();
     if (opCount == 0) {
         if (operandCount != 1)
             return kExpectedOperator;
         return kNoError;
     }
     SkOp op = (SkOp) (fOpStack.top() & ~kArtificialOp);
     const SkOperatorAttributes* attributes = &gOpAttributes[op];
     if (attributes->fLeftType != kNoType && operandCount < 2)
         return kExpectedValue;
     if (attributes->fLeftType == kNoType && operandCount < 1)
         return kExpectedValue;
     return kNoError;
 }
 bool SkScriptEngine::processOp() {
     SkOp op;
     fOpStack.pop(&op);
     op = (SkOp) (op & ~kArtificialOp);
     const SkOperatorAttributes* attributes = &gOpAttributes[op];
     SkOpType type2;
     fTypeStack.pop(&type2);
     SkOpType type1 = type2;
     SkOperand operand2;
     fOperandStack.pop(&operand2);
     SkOperand operand1 = operand2; // !!! not really needed, suppresses warning
     if (attributes->fLeftType != kNoType) {
         fTypeStack.pop(&type1);
         fOperandStack.pop(&operand1);
         if (op == kFlipOps) {
             SkTSwap(type1, type2);
             SkTSwap(operand1, operand2);
             fOpStack.pop(&op);
             op = (SkOp) (op & ~kArtificialOp);
             attributes = &gOpAttributes[op];
         }
         if (type1 == kObject && (type1 & attributes->fLeftType) == 0) {
             SkScriptValue val;
             val.fType = ToDisplayType(type1);
             val.fOperand = operand1;
             bool success = handleUnbox(&val);
             if (success == false)
                 return false;
             type1 = ToOpType(val.fType);
             operand1 = val.fOperand;
         }
     }
     if (type2 == kObject && (type2 & attributes->fLeftType) == 0) {
         SkScriptValue val;
         val.fType = ToDisplayType(type2);
         val.fOperand = operand2;
         bool success = handleUnbox(&val);
         if (success == false)
             return false;
         type2 = ToOpType(val.fType);
         operand2 = val.fOperand;
     }
     if (attributes->fLeftType != kNoType) {
         if (type1 != type2) {
             if ((attributes->fLeftType & kString) && attributes->fBias & kTowardsString && ((type1 | type2) & kString)) {
                 if (type1 == kInt || type1 == kScalar) {
                     convertToString(operand1, type1 == kInt ? SkType_Int : SkType_Float);
                     type1 = kString;
                 }
                 if (type2 == kInt || type2 == kScalar) {
                     convertToString(operand2, type2 == kInt ? SkType_Int : SkType_Float);
                     type2 = kString;
                 }
             } else if (attributes->fLeftType & kScalar && ((type1 | type2) & kScalar)) {
                 if (type1 == kInt) {
                     operand1.fScalar = IntToScalar(operand1.fS32);
                     type1 = kScalar;
                 }
                 if (type2 == kInt) {
                     operand2.fScalar = IntToScalar(operand2.fS32);
                      type2 = kScalar;
                 }
             }
         }
         if ((type1 & attributes->fLeftType) == 0 || type1 != type2) {
             if (type1 == kString) {
                 const char* result = SkParse::FindScalar(operand1.fString->c_str(), &operand1.fScalar);
                 if (result == NULL) {
                     fError = kExpectedNumber;
                     return false;
                 }
                 type1 = kScalar;
             }
             if (type1 == kScalar && (attributes->fLeftType == kInt || type2 == kInt)) {
                 operand1.fS32 = SkScalarFloorToInt(operand1.fScalar);
                 type1 = kInt;
             }
         }
     }
     if ((type2 & attributes->fRightType) == 0 || type1 != type2) {
         if (type2 == kString) {
             const char* result = SkParse::FindScalar(operand2.fString->c_str(), &operand2.fScalar);
             if (result == NULL) {
                 fError = kExpectedNumber;
                 return false;
             }
             type2 = kScalar;
         }
         if (type2 == kScalar && (attributes->fRightType == kInt || type1 == kInt)) {
             operand2.fS32 = SkScalarFloorToInt(operand2.fScalar);
             type2 = kInt;
         }
     }
     if (type2 == kScalar)
         op = (SkOp) (op + 1);
     else if (type2 == kString)
         op = (SkOp) (op + 2);
     switch(op) {
         case kAddInt:
             operand2.fS32 += operand1.fS32;
             break;
         case kAddScalar:
             operand2.fScalar += operand1.fScalar;
             break;
         case kAddString:
             if (fTrackString.find(operand1.fString) < 0) {
                 operand1.fString = SkNEW_ARGS(SkString, (*operand1.fString));
                 track(operand1.fString);
             }
             operand1.fString->append(*operand2.fString);
             operand2 = operand1;
             break;
         case kBitAnd:
             operand2.fS32 &= operand1.fS32;
             break;
         case kBitNot:
             operand2.fS32 = ~operand2.fS32;
             break;
         case kBitOr:
             operand2.fS32 |= operand1.fS32;
             break;
         case kDivideInt:
             if (operand2.fS32 == 0) {
                 operand2.fS32 = operand1.fS32 == 0 ? SK_NaN32 : operand1.fS32 > 0 ? SK_MaxS32 : -SK_MaxS32;
                 break;
             } else {
                 int32_t original = operand2.fS32;
                 operand2.fS32 = operand1.fS32 / operand2.fS32;
                 if (original * operand2.fS32 == operand1.fS32)
                     break;    // integer divide was good enough
                 operand2.fS32 = original;
                 type2 = kScalar;
             }
         case kDivideScalar:
             if (operand2.fScalar == 0)
                 operand2.fScalar = operand1.fScalar == 0 ? SK_ScalarNaN : operand1.fScalar > 0 ? SK_ScalarMax : -SK_ScalarMax;
             else
                 operand2.fScalar = SkScalarDiv(operand1.fScalar, operand2.fScalar);
             break;
         case kEqualInt:
             operand2.fS32 = operand1.fS32 == operand2.fS32;
             break;
         case kEqualScalar:
             operand2.fS32 = operand1.fScalar == operand2.fScalar;
             type2 = kInt;
             break;
         case kEqualString:
             operand2.fS32 = *operand1.fString == *operand2.fString;
             type2 = kInt;
             break;
         case kGreaterEqualInt:
             operand2.fS32 = operand1.fS32 >= operand2.fS32;
             break;
         case kGreaterEqualScalar:
             operand2.fS32 = operand1.fScalar >= operand2.fScalar;
             type2 = kInt;
             break;
         case kGreaterEqualString:
             operand2.fS32 = strcmp(operand1.fString->c_str(), operand2.fString->c_str()) >= 0;
             type2 = kInt;
             break;
         case kLogicalAnd:
             operand2.fS32 = !! operand2.fS32;   // really, ToBool
             break;
         case kLogicalNot:
             operand2.fS32 = ! operand2.fS32;
             break;
         case kLogicalOr:
             SkASSERT(0);    // should have already been processed
             break;
         case kMinusInt:
             operand2.fS32 = -operand2.fS32;
             break;
         case kMinusScalar:
             operand2.fScalar = -operand2.fScalar;
             break;
         case kModuloInt:
             operand2.fS32 = operand1.fS32 % operand2.fS32;
             break;
         case kModuloScalar:
             operand2.fScalar = SkScalarMod(operand1.fScalar, operand2.fScalar);
             break;
         case kMultiplyInt:
             operand2.fS32 *= operand1.fS32;
             break;
         case kMultiplyScalar:
             operand2.fScalar = SkScalarMul(operand1.fScalar, operand2.fScalar);
             break;
         case kShiftLeft:
             operand2.fS32 = operand1.fS32 << operand2.fS32;
             break;
         case kShiftRight:
             operand2.fS32 = operand1.fS32 >> operand2.fS32;
             break;
         case kSubtractInt:
             operand2.fS32 = operand1.fS32 - operand2.fS32;
             break;
         case kSubtractScalar:
             operand2.fScalar = operand1.fScalar - operand2.fScalar;
             break;
         case kXor:
             operand2.fS32 ^= operand1.fS32;
             break;
         default:
             SkASSERT(0);
     }
     fTypeStack.push(type2);
     fOperandStack.push(operand2);
     return true;
 }
 void SkScriptEngine::propertyCallBack(_propertyCallBack prop, void* userStorage) {
     UserCallBack callBack;
     callBack.fPropertyCallBack = prop;
     commonCallBack(kProperty, callBack, userStorage);
 }
 void SkScriptEngine::track(SkTypedArray* array) {
     SkASSERT(fTrackArray.find(array) < 0);
     *(fTrackArray.end() - 1) = array;
     fTrackArray.appendClear();
 }
 void SkScriptEngine::track(SkString* string) {
     SkASSERT(fTrackString.find(string) < 0);
     *(fTrackString.end() - 1) = string;
     fTrackString.appendClear();
 }
 void SkScriptEngine::unboxCallBack(_unboxCallBack func, void* userStorage) {
     UserCallBack callBack;
     callBack.fUnboxCallBack = func;
     commonCallBack(kUnbox, callBack, userStorage);
 }
 bool SkScriptEngine::ConvertTo(SkScriptEngine* engine, SkDisplayTypes toType, SkScriptValue* value ) {
     SkASSERT(value);
     if (SkDisplayType::IsEnum(NULL /* fMaker */, toType))
         toType = SkType_Int;
     if (toType == SkType_Point || toType == SkType_3D_Point)
         toType = SkType_Float;
     if (toType == SkType_Drawable)
         toType = SkType_Displayable;
     SkDisplayTypes type = value->fType;
     if (type == toType)
         return true;
     SkOperand& operand = value->fOperand;
     bool success = true;
     switch (toType) {
         case SkType_Int:
             if (type == SkType_Boolean)
                 break;
             if (type == SkType_Float)
                 operand.fS32 = SkScalarFloorToInt(operand.fScalar);
             else {
                 if (type != SkType_String) {
                     success = false;
                     break; // error
                 }
                 success = SkParse::FindS32(operand.fString->c_str(), &operand.fS32) != NULL;
             }
             break;
         case SkType_Float:
             if (type == SkType_Int) {
                 if (operand.fS32 == SK_NaN32)
                     operand.fScalar = SK_ScalarNaN;
                 else if (SkAbs32(operand.fS32) == SK_MaxS32)
                     operand.fScalar = SkSign32(operand.fS32) * SK_ScalarMax;
                 else
                     operand.fScalar = SkIntToScalar(operand.fS32);
             } else {
                 if (type != SkType_String) {
                     success = false;
                     break; // error
                 }
                 success = SkParse::FindScalar(operand.fString->c_str(), &operand.fScalar) != NULL;
             }
             break;
         case SkType_String: {
             SkString* strPtr = new SkString();
             SkASSERT(engine);
             engine->track(strPtr);
             if (type == SkType_Int) {
                 strPtr->appendS32(operand.fS32);
             } else if (type == SkType_Displayable) {
                 SkASSERT(0); // must call through instance version instead of static version
             } else {
                 if (type != SkType_Float) {
                     success = false;
                     break;
                 }
                 strPtr->appendScalar(operand.fScalar);
             }
             operand.fString = strPtr;
             } break;
         case SkType_Array: {
             SkTypedArray* array = new SkTypedArray(type);
             *array->append() = operand;
             engine->track(array);
             operand.fArray = array;
             } break;
         default:
             SkASSERT(0);
     }
     value->fType = toType;
     if (success == false)
         engine->fError = kTypeConversionFailed;
     return success;
 }
 SkScalar SkScriptEngine::IntToScalar(int32_t s32) {
     SkScalar scalar;
     if (s32 == SK_NaN32)
         scalar = SK_ScalarNaN;
     else if (SkAbs32(s32) == SK_MaxS32)
         scalar = SkSign32(s32) * SK_ScalarMax;
     else
         scalar = SkIntToScalar(s32);
     return scalar;
 }
 SkDisplayTypes SkScriptEngine::ToDisplayType(SkOpType type) {
     int val = type;
     switch (val) {
         case kNoType:
             return SkType_Unknown;
         case kInt:
             return SkType_Int;
         case kScalar:
             return SkType_Float;
         case kString:
             return SkType_String;
         case kArray:
             return SkType_Array;
         case kObject:
             return SkType_Displayable;
 //      case kStruct:
 //          return SkType_Structure;
         default:
             SkASSERT(0);
             return SkType_Unknown;
     }
 }
 SkScriptEngine::SkOpType SkScriptEngine::ToOpType(SkDisplayTypes type) {
     if (SkDisplayType::IsDisplayable(NULL /* fMaker */, type))
         return (SkOpType) kObject;
     if (SkDisplayType::IsEnum(NULL /* fMaker */, type))
         return kInt;
     switch (type) {
         case SkType_ARGB:
         case SkType_MSec:
         case SkType_Int:
             return kInt;
         case SkType_Float:
         case SkType_Point:
         case SkType_3D_Point:
             return kScalar;
         case SkType_Base64:
         case SkType_DynamicString:
         case SkType_String:
             return kString;
         case SkType_Array:
             return (SkOpType) kArray;
         case SkType_Unknown:
             return kNoType;
         default:
             SkASSERT(0);
             return kNoType;
     }
 }
 bool SkScriptEngine::ValueToString(SkScriptValue value, SkString* string) {
     switch (value.fType) {
         case kInt:
             string->reset();
             string->appendS32(value.fOperand.fS32);
             break;
         case kScalar:
             string->reset();
             string->appendScalar(value.fOperand.fScalar);
             break;
         case kString:
             string->set(*value.fOperand.fString);
             break;
         default:
             SkASSERT(0);
             return false;
     }
     return true; // no error
 }
 #ifdef SK_SUPPORT_UNITTEST
 #include "SkFloatingPoint.h"
 #define DEF_SCALAR_ANSWER   0
 #define DEF_STRING_ANSWER   NULL
 #define testInt(expression) { #expression, SkType_Int, expression, DEF_SCALAR_ANSWER, DEF_STRING_ANSWER }
     #define testScalar(expression) { #expression, SkType_Float, 0, (float) expression, DEF_STRING_ANSWER }
     #define testRemainder(exp1, exp2) { #exp1 "%" #exp2, SkType_Float, 0, sk_float_mod(exp1, exp2), DEF_STRING_ANSWER }
 #define testTrue(expression) { #expression, SkType_Int, 1, DEF_SCALAR_ANSWER, DEF_STRING_ANSWER }
 #define testFalse(expression) { #expression, SkType_Int, 0, DEF_SCALAR_ANSWER, DEF_STRING_ANSWER }
 static const SkScriptNAnswer scriptTests[]  = {
     testInt(1>1/2),
     testInt((6+7)*8),
     testInt(0&&1?2:3),
     testInt(3*(4+5)),
     testScalar(1.0+2.0),
     testScalar(1.0+5),
     testScalar(3.0-1.0),
     testScalar(6-1.0),
     testScalar(- -5.5- -1.5),
     testScalar(2.5*6.),
     testScalar(0.5*4),
     testScalar(4.5/.5),
     testScalar(9.5/19),
     testRemainder(9.5, 0.5),
     testRemainder(9.,2),
     testRemainder(9,2.5),
     testRemainder(-9,2.5),
     testTrue(-9==-9.0),
     testTrue(-9.==-4.0-5),
     testTrue(-9.*1==-4-5),
     testFalse(-9!=-9.0),
     testFalse(-9.!=-4.0-5),
     testFalse(-9.*1!=-4-5),
     testInt(0x123),
     testInt(0XABC),
     testInt(0xdeadBEEF),
     {   "'123'+\"456\"", SkType_String, 0, 0, "123456" },
     {   "123+\"456\"", SkType_String, 0, 0, "123456" },
     {   "'123'+456", SkType_String, 0, 0, "123456" },
     {   "'123'|\"456\"", SkType_Int, 123|456, DEF_SCALAR_ANSWER, DEF_STRING_ANSWER },
     {   "123|\"456\"", SkType_Int, 123|456, DEF_SCALAR_ANSWER, DEF_STRING_ANSWER },
     {   "'123'|456", SkType_Int, 123|456, DEF_SCALAR_ANSWER, DEF_STRING_ANSWER },
     {   "'2'<11", SkType_Int, 1, DEF_SCALAR_ANSWER, DEF_STRING_ANSWER },
     {   "2<'11'", SkType_Int, 1, DEF_SCALAR_ANSWER, DEF_STRING_ANSWER },
     {   "'2'<'11'", SkType_Int, 0, DEF_SCALAR_ANSWER, DEF_STRING_ANSWER },
     testInt(123),
     testInt(-345),
     testInt(+678),
     testInt(1+2+3),
     testInt(3*4+5),
     testInt(6+7*8),
     testInt(-1-2-8/4),
     testInt(-9%4),
     testInt(9%-4),
     testInt(-9%-4),
     testInt(123|978),
     testInt(123&978),
     testInt(123^978),
     testInt(2<<4),
     testInt(99>>3),
     testInt(~55),
     testInt(~~55),
     testInt(!55),
     testInt(!!55),
     // both int
     testInt(2<2),
     testInt(2<11),
     testInt(20<11),
     testInt(2<=2),
     testInt(2<=11),
     testInt(20<=11),
     testInt(2>2),
     testInt(2>11),
     testInt(20>11),
     testInt(2>=2),
     testInt(2>=11),
     testInt(20>=11),
     testInt(2==2),
     testInt(2==11),
     testInt(20==11),
     testInt(2!=2),
     testInt(2!=11),
     testInt(20!=11),
     // left int, right scalar
     testInt(2<2.),
     testInt(2<11.),
     testInt(20<11.),
     testInt(2<=2.),
     testInt(2<=11.),
     testInt(20<=11.),
     testInt(2>2.),
     testInt(2>11.),
     testInt(20>11.),
     testInt(2>=2.),
     testInt(2>=11.),
     testInt(20>=11.),
     testInt(2==2.),
     testInt(2==11.),
     testInt(20==11.),
     testInt(2!=2.),
     testInt(2!=11.),
     testInt(20!=11.),
     // left scalar, right int
         testInt(2.<2),
     testInt(2.<11),
     testInt(20.<11),
     testInt(2.<=2),
     testInt(2.<=11),
     testInt(20.<=11),
     testInt(2.>2),
     testInt(2.>11),
     testInt(20.>11),
     testInt(2.>=2),
     testInt(2.>=11),
     testInt(20.>=11),
     testInt(2.==2),
     testInt(2.==11),
     testInt(20.==11),
     testInt(2.!=2),
     testInt(2.!=11),
     testInt(20.!=11),
     // both scalar
     testInt(2.<11.),
     testInt(20.<11.),
     testInt(2.<=2.),
     testInt(2.<=11.),
     testInt(20.<=11.),
     testInt(2.>2.),
     testInt(2.>11.),
     testInt(20.>11.),
     testInt(2.>=2.),
     testInt(2.>=11.),
     testInt(20.>=11.),
     testInt(2.==2.),
     testInt(2.==11.),
     testInt(20.==11.),
     testInt(2.!=2.),
     testInt(2.!=11.),
     testInt(20.!=11.),
     // int, string (string is int)
     testFalse(2<'2'),
     testTrue(2<'11'),
     testFalse(20<'11'),
     testTrue(2<='2'),
     testTrue(2<='11'),
     testFalse(20<='11'),
     testFalse(2>'2'),
     testFalse(2>'11'),
     testTrue(20>'11'),
     testTrue(2>='2'),
     testFalse(2>='11'),
     testTrue(20>='11'),
     testTrue(2=='2'),
     testFalse(2=='11'),
     testFalse(2!='2'),
     testTrue(2!='11'),
     // int, string (string is scalar)
     testFalse(2<'2.'),
     testTrue(2<'11.'),
     testFalse(20<'11.'),
     testTrue(2=='2.'),
     testFalse(2=='11.'),
     // scalar, string
     testFalse(2.<'2.'),
     testTrue(2.<'11.'),
     testFalse(20.<'11.'),
     testTrue(2.=='2.'),
     testFalse(2.=='11.'),
     // string, int
     testFalse('2'<2),
     testTrue('2'<11),
     testFalse('20'<11),
     testTrue('2'==2),
     testFalse('2'==11),
     // string, scalar
     testFalse('2'<2.),
     testTrue('2'<11.),
     testFalse('20'<11.),
     testTrue('2'==2.),
     testFalse('2'==11.),
     // string, string
     testFalse('2'<'2'),
     testFalse('2'<'11'),
     testFalse('20'<'11'),
     testTrue('2'=='2'),
     testFalse('2'=='11'),
     // logic
     testInt(1?2:3),
     testInt(0?2:3),
     testInt((1&&2)||3),
     testInt((1&&0)||3),
     testInt((1&&0)||0),
     testInt(1||(0&&3)),
     testInt(0||(0&&3)),
     testInt(0||(1&&3)),
     testInt(1?(2?3:4):5),
     testInt(0?(2?3:4):5),
     testInt(1?(0?3:4):5),
     testInt(0?(0?3:4):5),
     testInt(1?2?3:4:5),
     testInt(0?2?3:4:5),
     testInt(1?0?3:4:5),
     testInt(0?0?3:4:5),
     testInt(1?2:(3?4:5)),
     testInt(0?2:(3?4:5)),
     testInt(1?0:(3?4:5)),
     testInt(0?0:(3?4:5)),
     testInt(1?2:3?4:5),
     testInt(0?2:3?4:5),
     testInt(1?0:3?4:5),
     testInt(0?0:3?4:5)
     , { "123.5", SkType_Float, 0, SkIntToScalar(123) + SK_Scalar1/2, DEF_STRING_ANSWER }
 };
 #define SkScriptNAnswer_testCount   SK_ARRAY_COUNT(scriptTests)
 void SkScriptEngine::UnitTest() {
     for (unsigned index = 0; index < SkScriptNAnswer_testCount; index++) {
         SkScriptEngine engine(SkScriptEngine::ToOpType(scriptTests[index].fType));
         SkScriptValue value;
         const char* script = scriptTests[index].fScript;
         SkASSERT(engine.evaluateScript(&script, &value) == true);
         SkASSERT(value.fType == scriptTests[index].fType);
         SkScalar error;
         switch (value.fType) {
             case SkType_Int:
                 SkASSERT(value.fOperand.fS32 == scriptTests[index].fIntAnswer);
                 break;
             case SkType_Float:
                 error = SkScalarAbs(value.fOperand.fScalar - scriptTests[index].fScalarAnswer);
                 SkASSERT(error < SK_Scalar1 / 10000);
                 break;
             case SkType_String:
                 SkASSERT(strcmp(value.fOperand.fString->c_str(), scriptTests[index].fStringAnswer) == 0);
                 break;
             default:
                 SkASSERT(0);
         }
     }
 }
 #endif

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gfx/skia/trunk/src/animator/SkScript.cpp@a63d609f5ebe (annotated)

gfx/skia/trunk/src/animator/SkScript.cpp