int Lexer::unicodeEscape()
{
if (*idx == '{') {
idx++;
mark = idx;
if (!hexDigits(-1) || *idx != '}')
compiler->syntaxError(lineno, "Invalid variable-length unicode escape");
int n = (int)parseInt(16);
idx++;
return n;
}
return hexEscape(4);
}
static QString utf8encode(const QByteArray &array) // turns e.g. tranøy.no to tran\xc3\xb8y.no
{
QString result;
result.reserve(array.length() + array.length() / 3);
for (int i = 0; i < array.length(); ++i) {
char c = array.at(i);
// if char is non-ascii, escape it
if (c < 0x20 || uchar(c) >= 0x7f) {
result += "\\x" + QString::number(uchar(c), 16);
} else {
// if previous char was escaped, we need to make sure the next char is not
// interpreted as part of the hex value, e.g. "äc.com" -> "\xabc.com"; this
// should be "\xab""c.com"
QRegExp hexEscape("\\\\x[a-fA-F0-9][a-fA-F0-9]$");
bool isHexChar = ((c >= '0' && c <= '9') ||
(c >= 'a' && c <= 'f') ||
(c >= 'A' && c <= 'F'));
if (result.contains(hexEscape) && isHexChar)
result += "\"\"";
result += c;
}
}
return result;
}
int Lexer::escapeSequence()
{
switch (*idx) {
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
return octalOrNulEscape ();
case 'x':
idx++;
// Compatibility fallback, handle \x<whatever> as "x" followed by <whatever>
mark = idx;
if (hexDigits(2)) {
idx = mark;
return hexEscape(2);
}
idx = mark;
return 'x';
case 'u':
idx++;
// Compatibility fallback, handle \u<whatever> as "u" followed by <whatever>
mark = idx;
if (hexDigits(4)) {
idx = mark;
return unicodeEscape ();
}
idx = mark;
return 'u';
case 'b':
idx++;
return '\b';
case 'f':
idx++;
return '\f';
case 'n':
idx++;
return '\n';
case 'r':
idx++;
return '\r';
case 't':
idx++;
return '\t';
case 'v':
idx++;
return '\v';
case '\'':
case '"':
case '\\':
return *idx++;
case 0:
if (idx+1 >= limit)
compiler->syntaxError(lineno, "End of input in escape sequence");
idx++;
return 0;
case '\n':
case '\r':
case UNICHAR_LS:
case UNICHAR_PS:
compiler->syntaxError(lineno, "Illegal line terminator in escape sequence");
default:
return *idx++;
}
}