/**
* <strong>[B.1.1] Numeric Literals</strong>
*
* <pre>
* LegacyOctalIntegerLiteral ::
* 0 OctalDigit
* LegacyOctalIntegerLiteral OctalDigit
* </pre>
*/
private double readLegacyOctalIntegerLiteral() {
TokenStreamInput input = this.input;
StringBuffer buffer = this.buffer();
int c;
while (isOctalDigit(c = input.get())) {
buffer.add(c);
}
if (c == '8' || c == '9') {
// invalid octal integer literal -> treat as decimal literal, no strict-mode error
// FIXME: spec bug? undefined behaviour - SM reports a strict-mode error in this case
return readDecimalLiteral(c, false);
}
parser.reportStrictModeSyntaxError(Messages.Key.StrictModeOctalIntegerLiteral);
if (isDecimalDigitOrIdentifierStart(c)) {
throw error(Messages.Key.InvalidOctalIntegerLiteral);
}
input.unget(c);
if (buffer.length == 0) {
throw error(Messages.Key.InvalidOctalIntegerLiteral);
}
return parseOctal(buffer.cbuf, buffer.length);
}
/**
* <strong>[B.1.2] String Literals</strong>
*
* <pre>
* OctalEscapeSequence ::
* OctalDigit [lookahead ∉ DecimalDigit]
* ZeroToThree OctalDigit [lookahead ∉ DecimalDigit]
* FourToSeven OctalDigit
* ZeroToThree OctalDigit OctalDigit
* ZeroToThree :: one of
* 0 1 2 3
* FourToSeven :: one of
* 4 5 6 7
* </pre>
*/
private int readOctalEscape(int c) {
parser.reportStrictModeSyntaxError(Messages.Key.StrictModeOctalEscapeSequence);
int d = (c - '0');
c = input.get();
if (c < '0' || c > '7') {
// FIXME: spec bug? behaviour for non-octal decimal digits?
input.unget(c);
} else {
d = d * 8 + (c - '0');
if (d <= 037) {
c = input.get();
if (c < '0' || c > '7') {
// FIXME: spec bug? behaviour for non-octal decimal digits?
input.unget(c);
} else {
d = d * 8 + (c - '0');
}
}
}
return d;
}