static long ReadString(byte[] text, uint length, long offset, Token token)
{
uint strLen = 0;
for (long i = offset + 1; i < length; i++)
{
byte ch = text[i];
if (ch <' ' | ch> '~')
{
return(-offset - 1);
}
if (ch == '"')
{
if (token != null)
{
char[] chars = new char[strLen];
int nextIdx = 0;
for (int j = 0; j < i - offset - 1; j++)
{
char currChar = (char)text[offset + j + 1];
if (currChar == '\\')
{
j++;
currChar = (char)text[offset + j + 1];
if (currChar == '\\' | currChar == '"')
{
// Nothing to do here
}
else if (currChar == 'n')
{
currChar = '\n';
}
else if (currChar == 't')
{
currChar = '\t';
}
else
{
currChar = (char)(
4092 * Miscellanea.HexDigitValue(ch) +
256 * Miscellanea.HexDigitValue(text[j + 1]) +
16 * Miscellanea.HexDigitValue(text[j + 2]) +
Miscellanea.HexDigitValue(text[j + 3])
);
j += 3;
}
}
chars[nextIdx++] = currChar;
}
Miscellanea.Assert(nextIdx == strLen);
token.offset = offset;
token.length = i + 1 - offset;
token.type = TokenType.String;
token.value = new string(chars);
}
return(i + 1);
}
strLen++;
if (ch == '\\')
{
if (++i == length)
{
return(-i - 1);
}
ch = text[i];
if (Miscellanea.IsHexDigit(ch))
{
if (i + 3 >= length || !(Miscellanea.IsHexDigit(text[i + 1]) & Miscellanea.IsHexDigit(text[i + 2]) & Miscellanea.IsHexDigit(text[i + 3])))
{
return(-i);
}
i += 3;
}
else if (ch != '\\' & ch != '"' & ch != 'n' & ch != 't')
{
return(-i);
}
}
}
return(-(length + 1));
}