PRBool nsCSSScanner::ParseAtKeyword(nsresult& aErrorCode, PRInt32 aChar,
nsCSSToken& aToken)
{
aToken.mIdent.SetLength(0);
aToken.mType = eCSSToken_AtKeyword;
return GatherIdent(aErrorCode, 0, aToken.mIdent);
}
PRBool
nsCSSScanner::ParseAtKeyword(PRInt32 aChar, nsCSSToken& aToken)
{
aToken.mIdent.SetLength(0);
aToken.mType = eCSSToken_AtKeyword;
return GatherIdent(0, aToken.mIdent);
}
PRBool nsCSSScanner::ParseIdent(nsresult& aErrorCode,
PRInt32 aChar,
nsCSSToken& aToken)
{
nsString& ident = aToken.mIdent;
ident.SetLength(0);
if (!GatherIdent(aErrorCode, aChar, ident)) {
return PR_FALSE;
}
nsCSSTokenType tokenType = eCSSToken_Ident;
// look for functions (ie: "ident(")
if (PRUnichar('(') == PRUnichar(Peek(aErrorCode))) { // this is a function definition
tokenType = eCSSToken_Function;
}
aToken.mType = tokenType;
return PR_TRUE;
}
PRBool
nsCSSScanner::ParseRef(PRInt32 aChar, nsCSSToken& aToken)
{
aToken.mIdent.SetLength(0);
aToken.mType = eCSSToken_Ref;
PRInt32 ch = Read();
if (ch < 0) {
return PR_FALSE;
}
if (IsIdent(ch) || ch == CSS_ESCAPE) {
// First char after the '#' is a valid ident char (or an escape),
// so it makes sense to keep going
if (StartsIdent(ch, Peek())) {
aToken.mType = eCSSToken_ID;
}
return GatherIdent(ch, aToken.mIdent);
}
// No ident chars after the '#'. Just unread |ch| and get out of here.
Pushback(ch);
return PR_TRUE;
}
PRBool nsCSSScanner::ParseRef(nsresult& aErrorCode,
PRInt32 aChar,
nsCSSToken& aToken)
{
aToken.mIdent.SetLength(0);
aToken.mType = eCSSToken_Ref;
PRInt32 ch = Read(aErrorCode);
if (ch < 0) {
return PR_FALSE;
}
if (ch > 255 || (gLexTable[ch] & IS_IDENT) || ch == CSS_ESCAPE) {
// First char after the '#' is a valid ident char (or an escape),
// so it makes sense to keep going
if (StartsIdent(ch, Peek(aErrorCode), gLexTable)) {
aToken.mType = eCSSToken_ID;
}
return GatherIdent(aErrorCode, ch, aToken.mIdent);
}
// No ident chars after the '#'. Just unread |ch| and get out of here.
Unread();
return PR_TRUE;
}
PRBool
nsCSSScanner::ParseIdent(PRInt32 aChar, nsCSSToken& aToken)
{
nsString& ident = aToken.mIdent;
ident.SetLength(0);
if (!GatherIdent(aChar, ident)) {
return PR_FALSE;
}
nsCSSTokenType tokenType = eCSSToken_Ident;
// look for functions (ie: "ident(")
if (Peek() == PRUnichar('(')) {
Read();
tokenType = eCSSToken_Function;
if (ident.LowerCaseEqualsLiteral("url")) {
NextURL(aToken); // ignore return value, since *we* read something
return PR_TRUE;
}
}
aToken.mType = tokenType;
return PR_TRUE;
}
PRBool
nsCSSScanner::ParseNumber(PRInt32 c, nsCSSToken& aToken)
{
NS_PRECONDITION(c == '.' || c == '+' || c == '-' || IsDigit(c),
"Why did we get called?");
aToken.mHasSign = (c == '+' || c == '-');
// Our sign.
PRInt32 sign = c == '-' ? -1 : 1;
// Absolute value of the integer part of the mantissa. This is a double so
// we don't run into overflow issues for consumers that only care about our
// floating-point value while still being able to express the full PRInt32
// range for consumers who want integers.
double intPart = 0;
// Fractional part of the mantissa. This is a double so that when we convert
// to float at the end we'll end up rounding to nearest float instead of
// truncating down (as we would if fracPart were a float and we just
// effectively lost the last several digits).
double fracPart = 0;
// Absolute value of the power of 10 that we should multiply by (only
// relevant for numbers in scientific notation). Has to be a signed integer,
// because multiplication of signed by unsigned converts the unsigned to
// signed, so if we plan to actually multiply by expSign...
PRInt32 exponent = 0;
// Sign of the exponent.
PRInt32 expSign = 1;
if (aToken.mHasSign) {
NS_ASSERTION(c != '.', "How did that happen?");
c = Read();
}
PRBool gotDot = (c == '.');
if (!gotDot) {
// Parse the integer part of the mantisssa
NS_ASSERTION(IsDigit(c), "Why did we get called?");
do {
intPart = 10*intPart + DecimalDigitValue(c);
c = Read();
// The IsDigit check will do the right thing even if Read() returns < 0
} while (IsDigit(c));
gotDot = (c == '.') && IsDigit(Peek());
}
if (gotDot) {
// Parse the fractional part of the mantissa.
c = Read();
NS_ASSERTION(IsDigit(c), "How did we get here?");
// Power of ten by which we need to divide our next digit
float divisor = 10;
do {
fracPart += DecimalDigitValue(c) / divisor;
divisor *= 10;
c = Read();
// The IsDigit check will do the right thing even if Read() returns < 0
} while (IsDigit(c));
}
PRBool gotE = PR_FALSE;
if (IsSVGMode() && (c == 'e' || c == 'E')) {
PRInt32 nextChar = Peek();
PRInt32 expSignChar = 0;
if (nextChar == '-' || nextChar == '+') {
expSignChar = Read();
nextChar = Peek();
}
if (IsDigit(nextChar)) {
gotE = PR_TRUE;
if (expSignChar == '-') {
expSign = -1;
}
c = Read();
NS_ASSERTION(IsDigit(c), "Peek() must have lied");
do {
exponent = 10*exponent + DecimalDigitValue(c);
c = Read();
// The IsDigit check will do the right thing even if Read() returns < 0
} while (IsDigit(c));
} else {
if (expSignChar) {
Pushback(expSignChar);
}
}
}
nsCSSTokenType type = eCSSToken_Number;
// Set mIntegerValid for all cases (except %, below) because we need
// it for the "2n" in :nth-child(2n).
aToken.mIntegerValid = PR_FALSE;
// Time to reassemble our number.
float value = float(sign * (intPart + fracPart));
if (gotE) {
// pow(), not powf(), because at least wince doesn't have the latter.
// And explicitly cast everything to doubles to avoid issues with
// overloaded pow() on Windows.
value *= pow(10.0, double(expSign * exponent));
} else if (!gotDot) {
// Clamp values outside of integer range.
if (sign > 0) {
aToken.mInteger = PRInt32(NS_MIN(intPart, double(PR_INT32_MAX)));
} else {
aToken.mInteger = PRInt32(NS_MAX(-intPart, double(PR_INT32_MIN)));
}
aToken.mIntegerValid = PR_TRUE;
}
nsString& ident = aToken.mIdent;
ident.Truncate();
// Look at character that terminated the number
if (c >= 0) {
if (StartsIdent(c, Peek())) {
if (!GatherIdent(c, ident)) {
return PR_FALSE;
}
type = eCSSToken_Dimension;
} else if ('%' == c) {
type = eCSSToken_Percentage;
value = value / 100.0f;
aToken.mIntegerValid = PR_FALSE;
} else {
// Put back character that stopped numeric scan
Pushback(c);
}
}
aToken.mNumber = value;
aToken.mType = type;
return PR_TRUE;
}
PRBool nsCSSScanner::ParseNumber(nsresult& aErrorCode, PRInt32 c,
nsCSSToken& aToken)
{
nsString& ident = aToken.mIdent;
ident.SetLength(0);
PRBool gotDot = (c == '.') ? PR_TRUE : PR_FALSE;
if (c != '+') {
ident.Append(PRUnichar(c));
}
// Gather up characters that make up the number
PRUint8* lexTable = gLexTable;
for (;;) {
c = Read(aErrorCode);
if (c < 0) break;
if (!gotDot && (c == '.') &&
CheckLexTable(Peek(aErrorCode), IS_DIGIT, lexTable)) {
gotDot = PR_TRUE;
} else if ((c > 255) || ((lexTable[c] & IS_DIGIT) == 0)) {
break;
}
ident.Append(PRUnichar(c));
}
// Convert number to floating point
nsCSSTokenType type = eCSSToken_Number;
PRInt32 ec;
float value = ident.ToFloat(&ec);
// Look at character that terminated the number
aToken.mIntegerValid = PR_FALSE;
if (c >= 0) {
if ((c <= 255) && ((lexTable[c] & START_IDENT) != 0)) {
ident.SetLength(0);
if (!GatherIdent(aErrorCode, c, ident)) {
return PR_FALSE;
}
type = eCSSToken_Dimension;
} else if ('%' == c) {
type = eCSSToken_Percentage;
value = value / 100.0f;
ident.SetLength(0);
} else {
// Put back character that stopped numeric scan
Unread();
if (!gotDot) {
aToken.mInteger = ident.ToInteger(&ec);
aToken.mIntegerValid = PR_TRUE;
}
ident.SetLength(0);
}
}
else { // stream ended
if (!gotDot) {
aToken.mInteger = ident.ToInteger(&ec);
aToken.mIntegerValid = PR_TRUE;
}
ident.SetLength(0);
}
aToken.mNumber = value;
aToken.mType = type;
return PR_TRUE;
}
