} // ParseNumber
// Parse a string literal or regexp expression beginning at the current
// stream location.
private Token ParseStringLiteral(SrcLoc loc)
{
// HACK SN 7/14/01: rewrite this to support literals longer
// than maxTokenLen.
// HACK SN 7/14/01: parse regexps as well as single- or double-quoted strings
// Get a buffer from which we can parse the string.
char[] charBuf;
int startPos;
int bufLen = buffer.GetBuffer(maxTokenLen, out charBuf, out startPos);
Trace.Assert(bufLen > 1);
// Scan to find the end of the string.
char quoteChar = charBuf[startPos];
int tokenLen = 1;
StringBuilder parsedValueBuilder = new StringBuilder();
while (tokenLen < bufLen)
{
char curChar = charBuf[startPos+tokenLen];
if (curChar == quoteChar)
break;
else if (curChar == '\\')
{
// HACK SN 7/14/01: extend this to parse all ECMAScript backslash
// sequences.
if (tokenLen+1 >= bufLen)
throw new ParseError("unterminated string literal or regexp", loc);
curChar = charBuf[startPos+tokenLen+1];
switch (curChar)
{
case 'b': curChar = '\b'; break;
case 'f': curChar = '\f'; break;
case 'n': curChar = '\n'; break;
case 'r': curChar = '\r'; break;
case 't': curChar = '\t'; break;
case 'v': curChar = '\v'; break;
}
parsedValueBuilder.Append(curChar);
tokenLen += 2;
}
else
{
parsedValueBuilder.Append(curChar);
tokenLen++;
}
} // while (tokenLen < bufLen)
if (tokenLen >= bufLen)
throw new ParseError("unterminated string literal or regexp", loc);
loc.len = tokenLen + 1;
StringLit litToken = new StringLit();
litToken.rawText = buffer.ConsumeString(tokenLen+1);
litToken.loc = loc;
litToken.parsedText = parsedValueBuilder.ToString();
switch (quoteChar)
{
case '\'': litToken.quoteType = StringLit.QuoteType.singleQ; break;
case '"': litToken.quoteType = StringLit.QuoteType.doubleQ; break;
case '/': litToken.quoteType = StringLit.QuoteType.regexp; break;
default:
Trace.Assert(false);
break;
}
return litToken;
} // ParseStringLiteral
} // ParseNumber
// Parse a string literal or regexp expression beginning at the current
// stream location.
private Token ParseStringLiteral(SrcLoc loc)
{
// HACK SN 7/14/01: rewrite this to support literals longer
// than maxTokenLen.
// HACK SN 7/14/01: parse regexps as well as single- or double-quoted strings
// Get a buffer from which we can parse the string.
char[] charBuf;
int startPos;
int bufLen = buffer.GetBuffer(maxTokenLen, out charBuf, out startPos);
Trace.Assert(bufLen > 1);
// Scan to find the end of the string.
char quoteChar = charBuf[startPos];
int tokenLen = 1;
StringBuilder parsedValueBuilder = new StringBuilder();
while (tokenLen < bufLen)
{
char curChar = charBuf[startPos + tokenLen];
if (curChar == quoteChar)
{
break;
}
else if (curChar == '\\')
{
// HACK SN 7/14/01: extend this to parse all ECMAScript backslash
// sequences.
if (tokenLen + 1 >= bufLen)
{
throw new ParseError("unterminated string literal or regexp", loc);
}
curChar = charBuf[startPos + tokenLen + 1];
switch (curChar)
{
case 'b': curChar = '\b'; break;
case 'f': curChar = '\f'; break;
case 'n': curChar = '\n'; break;
case 'r': curChar = '\r'; break;
case 't': curChar = '\t'; break;
case 'v': curChar = '\v'; break;
}
parsedValueBuilder.Append(curChar);
tokenLen += 2;
}
else
{
parsedValueBuilder.Append(curChar);
tokenLen++;
}
} // while (tokenLen < bufLen)
if (tokenLen >= bufLen)
{
throw new ParseError("unterminated string literal or regexp", loc);
}
loc.len = tokenLen + 1;
StringLit litToken = new StringLit();
litToken.rawText = buffer.ConsumeString(tokenLen + 1);
litToken.loc = loc;
litToken.parsedText = parsedValueBuilder.ToString();
switch (quoteChar)
{
case '\'': litToken.quoteType = StringLit.QuoteType.singleQ; break;
case '"': litToken.quoteType = StringLit.QuoteType.doubleQ; break;
case '/': litToken.quoteType = StringLit.QuoteType.regexp; break;
default:
Trace.Assert(false);
break;
}
return(litToken);
} // ParseStringLiteral