public static bool FindKeyword(nsCSSKeyword aKeyword, int[] aTable, ref int aResult)
{
int32_t index = FindIndexOfKeyword(aKeyword, aTable);
if (index >= 0) {
aResult = aTable[index + 1];
return true;
}
return false;
}
/**
* Given a token, determines the minimum and maximum number of function
* parameters to read, along with the mask that should be used to read
* those function parameters. If the token isn't a transform function,
* returns an error.
*
* @param aToken The token identifying the function.
* @param aMinElems [out] The minimum number of elements to read.
* @param aMaxElems [out] The maximum number of elements to read
* @param aVariantMask [out] The variant mask to use during parsing
* @return Whether the information was loaded successfully.
*/
static bool GetFunctionParseInformation(nsCSSKeyword aToken,
bool aIsPrefixed,
ref uint16_t aMinElems,
ref uint16_t aMaxElems,
ref int32_t[] aVariantMask,
ref bool aIs3D)
{
/* These types represent the common variant masks that will be used to
* parse out the individual functions. The order in the enumeration
* must match the order in which the masks are declared.
*/
const int eLengthPercentCalc = 0;
const int eLengthCalc = 1;
const int eTwoLengthPercentCalcs = 2;
const int eTwoLengthPercentCalcsOneLengthCalc = 3;
const int eAngle = 4;
const int eTwoAngles = 5;
const int eNumber = 6;
const int ePositiveLength = 7;
const int eTwoNumbers = 8;
const int eThreeNumbers = 9;
const int eThreeNumbersOneAngle = 10;
const int eMatrix = 11;
const int eMatrixPrefixed = 12;
const int eMatrix3d = 13;
const int eMatrix3dPrefixed = 14;
const int eNumVariantMasks = 15;
const int32_t kMaxElemsPerFunction = 16;
/*TODO: static*/ int32_t[][] kVariantMasks = {
new[] {VARIANT_LPCALC},
new[] {VARIANT_LENGTH|VARIANT_CALC},
new[] {VARIANT_LPCALC, VARIANT_LPCALC},
new[] {VARIANT_LPCALC, VARIANT_LPCALC, VARIANT_LENGTH|VARIANT_CALC},
new[] {VARIANT_ANGLE_OR_ZERO},
new[] {VARIANT_ANGLE_OR_ZERO, VARIANT_ANGLE_OR_ZERO},
new[] {VARIANT_NUMBER},
new[] {VARIANT_LENGTH|VARIANT_POSITIVE_DIMENSION},
new[] {VARIANT_NUMBER, VARIANT_NUMBER},
new[] {VARIANT_NUMBER, VARIANT_NUMBER, VARIANT_NUMBER},
new[] {VARIANT_NUMBER, VARIANT_NUMBER, VARIANT_NUMBER, VARIANT_ANGLE_OR_ZERO},
new[] {VARIANT_NUMBER, VARIANT_NUMBER, VARIANT_NUMBER, VARIANT_NUMBER,
VARIANT_NUMBER, VARIANT_NUMBER},
new[] {VARIANT_NUMBER, VARIANT_NUMBER, VARIANT_NUMBER, VARIANT_NUMBER,
VARIANT_LPNCALC, VARIANT_LPNCALC},
new[] {VARIANT_NUMBER, VARIANT_NUMBER, VARIANT_NUMBER, VARIANT_NUMBER,
VARIANT_NUMBER, VARIANT_NUMBER, VARIANT_NUMBER, VARIANT_NUMBER,
VARIANT_NUMBER, VARIANT_NUMBER, VARIANT_NUMBER, VARIANT_NUMBER,
VARIANT_NUMBER, VARIANT_NUMBER, VARIANT_NUMBER, VARIANT_NUMBER},
new[] {VARIANT_NUMBER, VARIANT_NUMBER, VARIANT_NUMBER, VARIANT_NUMBER,
VARIANT_NUMBER, VARIANT_NUMBER, VARIANT_NUMBER, VARIANT_NUMBER,
VARIANT_NUMBER, VARIANT_NUMBER, VARIANT_NUMBER, VARIANT_NUMBER,
VARIANT_LPNCALC, VARIANT_LPNCALC, VARIANT_LNCALC, VARIANT_NUMBER}};
#if DEBUG
/*TODO: static*/ uint8_t[] kVariantMaskLengths =
{1, 1, 2, 3, 1, 2, 1, 1, 2, 3, 4, 6, 6, 16, 16};
#endif
int32_t variantIndex = eNumVariantMasks;
aIs3D = false;
switch (aToken) {
case nsCSSKeyword.translatex:
case nsCSSKeyword.translatey:
/* Exactly one length or percent. */
variantIndex = eLengthPercentCalc;
aMinElems = 1;
aMaxElems = 1;
break;
case nsCSSKeyword.translatez:
/* Exactly one length */
variantIndex = eLengthCalc;
aMinElems = 1;
aMaxElems = 1;
aIs3D = true;
break;
case nsCSSKeyword.translate3d:
/* Exactly two lengthds or percents and a number */
variantIndex = eTwoLengthPercentCalcsOneLengthCalc;
aMinElems = 3;
aMaxElems = 3;
aIs3D = true;
break;
case nsCSSKeyword.scalez:
aIs3D = true;
goto case nsCSSKeyword.scalex;
case nsCSSKeyword.scalex:
case nsCSSKeyword.scaley:
/* Exactly one scale factor. */
variantIndex = eNumber;
aMinElems = 1;
aMaxElems = 1;
break;
case nsCSSKeyword.scale3d:
/* Exactly three scale factors. */
variantIndex = eThreeNumbers;
aMinElems = 3;
aMaxElems = 3;
aIs3D = true;
break;
case nsCSSKeyword.rotatex:
case nsCSSKeyword.rotatey:
aIs3D = true;
goto case nsCSSKeyword.rotate;
case nsCSSKeyword.rotate:
case nsCSSKeyword.rotatez:
/* Exactly one angle. */
variantIndex = eAngle;
aMinElems = 1;
aMaxElems = 1;
break;
case nsCSSKeyword.rotate3d:
variantIndex = eThreeNumbersOneAngle;
aMinElems = 4;
aMaxElems = 4;
aIs3D = true;
break;
case nsCSSKeyword.translate:
/* One or two lengths or percents. */
variantIndex = eTwoLengthPercentCalcs;
aMinElems = 1;
aMaxElems = 2;
break;
case nsCSSKeyword.skew:
/* Exactly one or two angles. */
variantIndex = eTwoAngles;
aMinElems = 1;
aMaxElems = 2;
break;
case nsCSSKeyword.scale:
/* One or two scale factors. */
variantIndex = eTwoNumbers;
aMinElems = 1;
aMaxElems = 2;
break;
case nsCSSKeyword.skewx:
/* Exactly one angle. */
variantIndex = eAngle;
aMinElems = 1;
aMaxElems = 1;
break;
case nsCSSKeyword.skewy:
/* Exactly one angle. */
variantIndex = eAngle;
aMinElems = 1;
aMaxElems = 1;
break;
case nsCSSKeyword.matrix:
/* Six values, all numbers. */
variantIndex = aIsPrefixed ? eMatrixPrefixed : eMatrix;
aMinElems = 6;
aMaxElems = 6;
break;
case nsCSSKeyword.matrix3d:
/* 16 matrix values, all numbers */
variantIndex = aIsPrefixed ? eMatrix3dPrefixed : eMatrix3d;
aMinElems = 6;
aMaxElems = 6;
aIs3D = true;
break;
case nsCSSKeyword.perspective:
/* Exactly one scale number. */
variantIndex = ePositiveLength;
aMinElems = 1;
aMaxElems = 1;
aIs3D = true;
break;
default:
/* Oh dear, we didn't match. Report an error. */
return false;
}
Debug.Assert(aMinElems > 0, "Didn't update minimum elements!");
Debug.Assert(aMaxElems > 0, "Didn't update maximum elements!");
Debug.Assert(aMinElems <= aMaxElems, "aMinElems > aMaxElems!");
Debug.Assert(variantIndex >= 0, "Invalid variant mask!");
Debug.Assert(variantIndex < eNumVariantMasks, "Invalid variant mask!");
#if DEBUG
Debug.Assert(aMaxElems <= kVariantMaskLengths[variantIndex],
"Invalid aMaxElems for this variant mask.");
#endif
// Convert the index into a mask.
aVariantMask = kVariantMasks[variantIndex];
return true;
}
private static int FindIndexOfKeyword(nsCSSKeyword aKeyword, int[] aTable)
{
int32_t index = 0;
while ((nsCSSKeyword)(aTable[index]) != nsCSSKeyword.UNKNOWN) {
if ((nsCSSKeyword)(aTable[index]) == aKeyword)
return index;
index += 2;
}
return -1;
}
public static string GetStringValue(nsCSSKeyword aKeyword)
{
return kCSSRawKeywords[(int)aKeyword];
}
