int QScript::Lexer::lex()
{
int token = 0;
state = Start;
ushort stringType = 0; // either single or double quotes
pos8 = pos16 = 0;
done = false;
terminator = false;
// did we push a token on the stack previously ?
// (after an automatic semicolon insertion)
if (stackToken >= 0) {
setDone(Other);
token = stackToken;
stackToken = -1;
}
while (!done) {
switch (state) {
case Start:
if (isWhiteSpace()) {
// do nothing
} else if (current == '/' && next1 == '/') {
recordStartPos();
shift(1);
state = InSingleLineComment;
} else if (current == '/' && next1 == '*') {
recordStartPos();
shift(1);
state = InMultiLineComment;
} else if (current == 0) {
syncProhibitAutomaticSemicolon();
if (!terminator && !delimited && !prohibitAutomaticSemicolon) {
// automatic semicolon insertion if program incomplete
token = QScriptGrammar::T_SEMICOLON;
stackToken = 0;
setDone(Other);
} else {
setDone(Eof);
}
} else if (isLineTerminator()) {
shiftWindowsLineBreak();
yylineno++;
yycolumn = 0;
bol = true;
terminator = true;
syncProhibitAutomaticSemicolon();
if (restrKeyword) {
token = QScriptGrammar::T_SEMICOLON;
setDone(Other);
}
} else if (current == '"' || current == '\'') {
recordStartPos();
state = InString;
stringType = current;
} else if (isIdentLetter(current)) {
recordStartPos();
record16(current);
state = InIdentifier;
} else if (current == '0') {
recordStartPos();
record8(current);
state = InNum0;
} else if (isDecimalDigit(current)) {
recordStartPos();
record8(current);
state = InNum;
} else if (current == '.' && isDecimalDigit(next1)) {
recordStartPos();
record8(current);
state = InDecimal;
} else {
recordStartPos();
token = matchPunctuator(current, next1, next2, next3);
if (token != -1) {
if (terminator && !delimited && !prohibitAutomaticSemicolon
&& (token == QScriptGrammar::T_PLUS_PLUS
|| token == QScriptGrammar::T_MINUS_MINUS)) {
// automatic semicolon insertion
stackToken = token;
token = QScriptGrammar::T_SEMICOLON;
}
setDone(Other);
}
else {
setDone(Bad);
err = IllegalCharacter;
errmsg = QLatin1String("Illegal character");
}
}
break;
case InString:
if (current == stringType) {
shift(1);
setDone(String);
} else if (current == 0 || isLineTerminator()) {
setDone(Bad);
err = UnclosedStringLiteral;
errmsg = QLatin1String("Unclosed string at end of line");
} else if (current == '\\') {
state = InEscapeSequence;
} else {
record16(current);
}
break;
// Escape Sequences inside of strings
case InEscapeSequence:
if (isOctalDigit(current)) {
if (current >= '0' && current <= '3' &&
isOctalDigit(next1) && isOctalDigit(next2)) {
record16(convertOctal(current, next1, next2));
shift(2);
state = InString;
} else if (isOctalDigit(current) &&
isOctalDigit(next1)) {
record16(convertOctal('0', current, next1));
shift(1);
state = InString;
} else if (isOctalDigit(current)) {
record16(convertOctal('0', '0', current));
state = InString;
} else {
setDone(Bad);
err = IllegalEscapeSequence;
errmsg = QLatin1String("Illegal escape squence");
}
} else if (current == 'x')
state = InHexEscape;
else if (current == 'u')
state = InUnicodeEscape;
else {
if (isLineTerminator()) {
shiftWindowsLineBreak();
yylineno++;
yycolumn = 0;
bol = true;
} else {
record16(singleEscape(current));
}
state = InString;
}
break;
case InHexEscape:
if (isHexDigit(current) && isHexDigit(next1)) {
state = InString;
record16(QLatin1Char(convertHex(current, next1)));
shift(1);
} else if (current == stringType) {
record16(QLatin1Char('x'));
shift(1);
setDone(String);
} else {
record16(QLatin1Char('x'));
record16(current);
state = InString;
}
break;
case InUnicodeEscape:
if (isHexDigit(current) && isHexDigit(next1) &&
isHexDigit(next2) && isHexDigit(next3)) {
record16(convertUnicode(current, next1, next2, next3));
shift(3);
state = InString;
} else if (current == stringType) {
record16(QLatin1Char('u'));
shift(1);
setDone(String);
} else {
setDone(Bad);
err = IllegalUnicodeEscapeSequence;
errmsg = QLatin1String("Illegal unicode escape sequence");
}
break;
case InSingleLineComment:
if (isLineTerminator()) {
shiftWindowsLineBreak();
yylineno++;
yycolumn = 0;
terminator = true;
bol = true;
if (restrKeyword) {
token = QScriptGrammar::T_SEMICOLON;
setDone(Other);
} else
state = Start;
} else if (current == 0) {
setDone(Eof);
}
break;
case InMultiLineComment:
if (current == 0) {
setDone(Bad);
err = UnclosedComment;
errmsg = QLatin1String("Unclosed comment at end of file");
} else if (isLineTerminator()) {
shiftWindowsLineBreak();
yylineno++;
} else if (current == '*' && next1 == '/') {
state = Start;
shift(1);
}
break;
case InIdentifier:
if (isIdentLetter(current) || isDecimalDigit(current)) {
record16(current);
break;
}
setDone(Identifier);
break;
case InNum0:
if (current == 'x' || current == 'X') {
record8(current);
state = InHex;
} else if (current == '.') {
record8(current);
state = InDecimal;
} else if (current == 'e' || current == 'E') {
record8(current);
state = InExponentIndicator;
} else if (isOctalDigit(current)) {
record8(current);
state = InOctal;
} else if (isDecimalDigit(current)) {
record8(current);
state = InDecimal;
} else {
setDone(Number);
}
break;
case InHex:
if (isHexDigit(current))
record8(current);
else
setDone(Hex);
break;
case InOctal:
if (isOctalDigit(current)) {
record8(current);
} else if (isDecimalDigit(current)) {
record8(current);
state = InDecimal;
} else {
setDone(Octal);
}
break;
case InNum:
if (isDecimalDigit(current)) {
record8(current);
} else if (current == '.') {
record8(current);
state = InDecimal;
} else if (current == 'e' || current == 'E') {
record8(current);
state = InExponentIndicator;
} else {
setDone(Number);
}
break;
case InDecimal:
if (isDecimalDigit(current)) {
record8(current);
} else if (current == 'e' || current == 'E') {
record8(current);
state = InExponentIndicator;
} else {
setDone(Number);
}
break;
case InExponentIndicator:
if (current == '+' || current == '-') {
record8(current);
} else if (isDecimalDigit(current)) {
record8(current);
state = InExponent;
} else {
setDone(Bad);
err = IllegalExponentIndicator;
errmsg = QLatin1String("Illegal syntax for exponential number");
}
break;
case InExponent:
if (isDecimalDigit(current)) {
record8(current);
} else {
setDone(Number);
}
break;
default:
Q_ASSERT_X(0, "Lexer::lex", "Unhandled state in switch statement");
}
// move on to the next character
if (!done)
shift(1);
if (state != Start && state != InSingleLineComment)
bol = false;
}
// no identifiers allowed directly after numeric literal, e.g. "3in" is bad
if ((state == Number || state == Octal || state == Hex)
&& isIdentLetter(current)) {
state = Bad;
err = IllegalIdentifier;
errmsg = QLatin1String("Identifier cannot start with numeric literal");
}
// terminate string
buffer8[pos8] = '\0';
double dval = 0;
if (state == Number) {
dval = qstrtod(buffer8, 0, 0);
} else if (state == Hex) { // scan hex numbers
dval = QScript::integerFromString(buffer8, pos8, 16);
state = Number;
} else if (state == Octal) { // scan octal number
dval = QScript::integerFromString(buffer8, pos8, 8);
state = Number;
}
restrKeyword = false;
delimited = false;
switch (parenthesesState) {
case IgnoreParentheses:
break;
case CountParentheses:
if (token == QScriptGrammar::T_RPAREN) {
--parenthesesCount;
if (parenthesesCount == 0)
parenthesesState = BalancedParentheses;
} else if (token == QScriptGrammar::T_LPAREN) {
++parenthesesCount;
}
break;
case BalancedParentheses:
parenthesesState = IgnoreParentheses;
break;
}
switch (state) {
case Eof:
return 0;
case Other:
if(token == QScriptGrammar::T_RBRACE || token == QScriptGrammar::T_SEMICOLON)
delimited = true;
return token;
case Identifier:
if ((token = findReservedWord(buffer16, pos16)) < 0) {
/* TODO: close leak on parse error. same holds true for String */
if (driver) {
Q_ASSERT_X(false, Q_FUNC_INFO, "not implemented");
qsyylval.ustr = 0; // driver->intern(buffer16, pos16);
} else
qsyylval.ustr = 0;
return QScriptGrammar::T_IDENTIFIER;
}
if (token == QScriptGrammar::T_CONTINUE || token == QScriptGrammar::T_BREAK
|| token == QScriptGrammar::T_RETURN || token == QScriptGrammar::T_THROW) {
restrKeyword = true;
} else if (token == QScriptGrammar::T_IF || token == QScriptGrammar::T_FOR
|| token == QScriptGrammar::T_WHILE || token == QScriptGrammar::T_WITH) {
parenthesesState = CountParentheses;
parenthesesCount = 0;
} else if (token == QScriptGrammar::T_DO) {
parenthesesState = BalancedParentheses;
}
return token;
case String:
if (driver) {
Q_ASSERT_X(false, Q_FUNC_INFO, "not implemented");
qsyylval.ustr = 0; // driver->intern(buffer16, pos16);
} else
qsyylval.ustr = 0;
return QScriptGrammar::T_STRING_LITERAL;
case Number:
qsyylval.dval = dval;
return QScriptGrammar::T_NUMERIC_LITERAL;
case Bad:
return -1;
default:
Q_ASSERT(!"unhandled numeration value in switch");
return -1;
}
}
int Lexer::lex(void* p1, void* p2)
{
ASSERT(!m_error);
ASSERT(m_buffer8.isEmpty());
ASSERT(m_buffer16.isEmpty());
YYSTYPE* lvalp = static_cast<YYSTYPE*>(p1);
YYLTYPE* llocp = static_cast<YYLTYPE*>(p2);
int token = 0;
m_terminator = false;
start:
while (isWhiteSpace(m_current))
shift1();
int startOffset = currentOffset();
if (m_current == -1) {
if (!m_terminator && !m_delimited && !m_isReparsing) {
// automatic semicolon insertion if program incomplete
token = ';';
goto doneSemicolon;
}
return 0;
}
m_delimited = false;
switch (m_current) {
case '>':
if (m_next1 == '>' && m_next2 == '>') {
if (m_next3 == '=') {
shift4();
token = URSHIFTEQUAL;
break;
}
shift3();
token = URSHIFT;
break;
}
if (m_next1 == '>') {
if (m_next2 == '=') {
shift3();
token = RSHIFTEQUAL;
break;
}
shift2();
token = RSHIFT;
break;
}
if (m_next1 == '=') {
shift2();
token = GE;
break;
}
shift1();
token = '>';
break;
case '=':
if (m_next1 == '=') {
if (m_next2 == '=') {
shift3();
token = STREQ;
break;
}
shift2();
token = EQEQ;
break;
}
shift1();
token = '=';
break;
case '!':
if (m_next1 == '=') {
if (m_next2 == '=') {
shift3();
token = STRNEQ;
break;
}
shift2();
token = NE;
break;
}
shift1();
token = '!';
break;
case '<':
if (m_next1 == '!' && m_next2 == '-' && m_next3 == '-') {
// <!-- marks the beginning of a line comment (for www usage)
shift4();
goto inSingleLineComment;
}
if (m_next1 == '<') {
if (m_next2 == '=') {
shift3();
token = LSHIFTEQUAL;
break;
}
shift2();
token = LSHIFT;
break;
}
if (m_next1 == '=') {
shift2();
token = LE;
break;
}
shift1();
token = '<';
break;
case '+':
if (m_next1 == '+') {
shift2();
if (m_terminator) {
token = AUTOPLUSPLUS;
break;
}
token = PLUSPLUS;
break;
}
if (m_next1 == '=') {
shift2();
token = PLUSEQUAL;
break;
}
shift1();
token = '+';
break;
case '-':
if (m_next1 == '-') {
if (m_atLineStart && m_next2 == '>') {
shift3();
goto inSingleLineComment;
}
shift2();
if (m_terminator) {
token = AUTOMINUSMINUS;
break;
}
token = MINUSMINUS;
break;
}
if (m_next1 == '=') {
shift2();
token = MINUSEQUAL;
break;
}
shift1();
token = '-';
break;
case '*':
if (m_next1 == '=') {
shift2();
token = MULTEQUAL;
break;
}
shift1();
token = '*';
break;
case '/':
if (m_next1 == '/') {
shift2();
goto inSingleLineComment;
}
if (m_next1 == '*')
goto inMultiLineComment;
if (m_next1 == '=') {
shift2();
token = DIVEQUAL;
break;
}
shift1();
token = '/';
break;
case '&':
if (m_next1 == '&') {
shift2();
token = AND;
break;
}
if (m_next1 == '=') {
shift2();
token = ANDEQUAL;
break;
}
shift1();
token = '&';
break;
case '^':
if (m_next1 == '=') {
shift2();
token = XOREQUAL;
break;
}
shift1();
token = '^';
break;
case '%':
if (m_next1 == '=') {
shift2();
token = MODEQUAL;
break;
}
shift1();
token = '%';
break;
case '|':
if (m_next1 == '=') {
shift2();
token = OREQUAL;
break;
}
if (m_next1 == '|') {
shift2();
token = OR;
break;
}
shift1();
token = '|';
break;
case '.':
if (isASCIIDigit(m_next1)) {
record8('.');
shift1();
goto inNumberAfterDecimalPoint;
}
token = '.';
shift1();
break;
case ',':
case '~':
case '?':
case ':':
case '(':
case ')':
case '[':
case ']':
token = m_current;
shift1();
break;
case ';':
shift1();
m_delimited = true;
token = ';';
break;
case '{':
lvalp->intValue = currentOffset();
shift1();
token = OPENBRACE;
break;
case '}':
lvalp->intValue = currentOffset();
shift1();
m_delimited = true;
token = CLOSEBRACE;
break;
case '\\':
goto startIdentifierWithBackslash;
case '0':
goto startNumberWithZeroDigit;
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
goto startNumber;
case '"':
case '\'':
goto startString;
default:
if (isIdentStart(m_current))
goto startIdentifierOrKeyword;
if (isLineTerminator(m_current)) {
shiftLineTerminator();
m_atLineStart = true;
m_terminator = true;
if (lastTokenWasRestrKeyword()) {
token = ';';
goto doneSemicolon;
}
goto start;
}
goto returnError;
}
m_atLineStart = false;
goto returnToken;
startString: {
int stringQuoteCharacter = m_current;
shift1();
const UChar* stringStart = currentCharacter();
while (m_current != stringQuoteCharacter) {
// Fast check for characters that require special handling.
// Catches -1, \n, \r, \, 0x2028, and 0x2029 as efficiently
// as possible, and lets through all common ASCII characters.
if (UNLIKELY(m_current == '\\') || UNLIKELY(((static_cast<unsigned>(m_current) - 0xE) & 0x2000))) {
m_buffer16.append(stringStart, currentCharacter() - stringStart);
goto inString;
}
shift1();
}
lvalp->ident = makeIdentifier(stringStart, currentCharacter() - stringStart);
shift1();
m_atLineStart = false;
m_delimited = false;
token = STRING;
goto returnToken;
inString:
while (m_current != stringQuoteCharacter) {
if (m_current == '\\')
goto inStringEscapeSequence;
if (UNLIKELY(isLineTerminator(m_current)))
goto returnError;
if (UNLIKELY(m_current == -1))
goto returnError;
record16(m_current);
shift1();
}
goto doneString;
inStringEscapeSequence:
shift1();
if (m_current == 'x') {
shift1();
if (isASCIIHexDigit(m_current) && isASCIIHexDigit(m_next1)) {
record16(convertHex(m_current, m_next1));
shift2();
goto inString;
}
record16('x');
if (m_current == stringQuoteCharacter)
goto doneString;
goto inString;
}
if (m_current == 'u') {
shift1();
if (isASCIIHexDigit(m_current) && isASCIIHexDigit(m_next1) && isASCIIHexDigit(m_next2) && isASCIIHexDigit(m_next3)) {
record16(convertUnicode(m_current, m_next1, m_next2, m_next3));
shift4();
goto inString;
}
if (m_current == stringQuoteCharacter) {
record16('u');
goto doneString;
}
goto returnError;
}
if (isASCIIOctalDigit(m_current)) {
if (m_current >= '0' && m_current <= '3' && isASCIIOctalDigit(m_next1) && isASCIIOctalDigit(m_next2)) {
record16((m_current - '0') * 64 + (m_next1 - '0') * 8 + m_next2 - '0');
shift3();
goto inString;
}
if (isASCIIOctalDigit(m_next1)) {
record16((m_current - '0') * 8 + m_next1 - '0');
shift2();
goto inString;
}
record16(m_current - '0');
shift1();
goto inString;
}
if (isLineTerminator(m_current)) {
shiftLineTerminator();
goto inString;
}
record16(singleEscape(m_current));
shift1();
goto inString;
}
startIdentifierWithBackslash:
shift1();
if (UNLIKELY(m_current != 'u'))
goto returnError;
shift1();
if (UNLIKELY(!isASCIIHexDigit(m_current) || !isASCIIHexDigit(m_next1) || !isASCIIHexDigit(m_next2) || !isASCIIHexDigit(m_next3)))
goto returnError;
token = convertUnicode(m_current, m_next1, m_next2, m_next3);
if (UNLIKELY(!isIdentStart(token)))
goto returnError;
goto inIdentifierAfterCharacterCheck;
startIdentifierOrKeyword: {
const UChar* identifierStart = currentCharacter();
shift1();
while (isIdentPart(m_current))
shift1();
if (LIKELY(m_current != '\\')) {
lvalp->ident = makeIdentifier(identifierStart, currentCharacter() - identifierStart);
goto doneIdentifierOrKeyword;
}
m_buffer16.append(identifierStart, currentCharacter() - identifierStart);
}
do {
shift1();
if (UNLIKELY(m_current != 'u'))
goto returnError;
shift1();
if (UNLIKELY(!isASCIIHexDigit(m_current) || !isASCIIHexDigit(m_next1) || !isASCIIHexDigit(m_next2) || !isASCIIHexDigit(m_next3)))
goto returnError;
token = convertUnicode(m_current, m_next1, m_next2, m_next3);
if (UNLIKELY(!isIdentPart(token)))
goto returnError;
inIdentifierAfterCharacterCheck:
record16(token);
shift4();
while (isIdentPart(m_current)) {
record16(m_current);
shift1();
}
} while (UNLIKELY(m_current == '\\'));
goto doneIdentifier;
inSingleLineComment:
while (!isLineTerminator(m_current)) {
if (UNLIKELY(m_current == -1))
return 0;
shift1();
}
shiftLineTerminator();
m_atLineStart = true;
m_terminator = true;
if (lastTokenWasRestrKeyword())
goto doneSemicolon;
goto start;
inMultiLineComment:
shift2();
while (m_current != '*' || m_next1 != '/') {
if (isLineTerminator(m_current))
shiftLineTerminator();
else {
shift1();
if (UNLIKELY(m_current == -1))
goto returnError;
}
}
shift2();
m_atLineStart = false;
goto start;
startNumberWithZeroDigit:
shift1();
if ((m_current | 0x20) == 'x' && isASCIIHexDigit(m_next1)) {
shift1();
goto inHex;
}
if (m_current == '.') {
record8('0');
record8('.');
shift1();
goto inNumberAfterDecimalPoint;
}
if ((m_current | 0x20) == 'e') {
record8('0');
record8('e');
shift1();
goto inExponentIndicator;
}
if (isASCIIOctalDigit(m_current))
goto inOctal;
if (isASCIIDigit(m_current))
goto startNumber;
lvalp->doubleValue = 0;
goto doneNumeric;
inNumberAfterDecimalPoint:
while (isASCIIDigit(m_current)) {
record8(m_current);
shift1();
}
if ((m_current | 0x20) == 'e') {
record8('e');
shift1();
goto inExponentIndicator;
}
goto doneNumber;
inExponentIndicator:
if (m_current == '+' || m_current == '-') {
record8(m_current);
shift1();
}
if (!isASCIIDigit(m_current))
goto returnError;
do {
record8(m_current);
shift1();
} while (isASCIIDigit(m_current));
goto doneNumber;
inOctal: {
do {
record8(m_current);
shift1();
} while (isASCIIOctalDigit(m_current));
if (isASCIIDigit(m_current))
goto startNumber;
double dval = 0;
const char* end = m_buffer8.end();
for (const char* p = m_buffer8.data(); p < end; ++p) {
dval *= 8;
dval += *p - '0';
}
if (dval >= mantissaOverflowLowerBound)
dval = parseIntOverflow(m_buffer8.data(), end - m_buffer8.data(), 8);
m_buffer8.resize(0);
lvalp->doubleValue = dval;
goto doneNumeric;
}
inHex: {
do {
record8(m_current);
shift1();
} while (isASCIIHexDigit(m_current));
double dval = 0;
const char* end = m_buffer8.end();
for (const char* p = m_buffer8.data(); p < end; ++p) {
dval *= 16;
dval += toASCIIHexValue(*p);
}
if (dval >= mantissaOverflowLowerBound)
dval = parseIntOverflow(m_buffer8.data(), end - m_buffer8.data(), 16);
m_buffer8.resize(0);
lvalp->doubleValue = dval;
goto doneNumeric;
}
startNumber:
record8(m_current);
shift1();
while (isASCIIDigit(m_current)) {
record8(m_current);
shift1();
}
if (m_current == '.') {
record8('.');
shift1();
goto inNumberAfterDecimalPoint;
}
if ((m_current | 0x20) == 'e') {
record8('e');
shift1();
goto inExponentIndicator;
}
// Fall through into doneNumber.
doneNumber:
// Null-terminate string for strtod.
m_buffer8.append('\0');
lvalp->doubleValue = WTF::strtod(m_buffer8.data(), 0);
m_buffer8.resize(0);
// Fall through into doneNumeric.
doneNumeric:
// No identifiers allowed directly after numeric literal, e.g. "3in" is bad.
if (UNLIKELY(isIdentStart(m_current)))
goto returnError;
m_atLineStart = false;
m_delimited = false;
token = NUMBER;
goto returnToken;
doneSemicolon:
token = ';';
m_delimited = true;
goto returnToken;
doneIdentifier:
m_atLineStart = false;
m_delimited = false;
lvalp->ident = makeIdentifier(m_buffer16.data(), m_buffer16.size());
m_buffer16.resize(0);
token = IDENT;
goto returnToken;
doneIdentifierOrKeyword: {
m_atLineStart = false;
m_delimited = false;
m_buffer16.resize(0);
const HashEntry* entry = m_keywordTable.entry(m_globalData, *lvalp->ident);
token = entry ? entry->lexerValue() : IDENT;
goto returnToken;
}
doneString:
// Atomize constant strings in case they're later used in property lookup.
shift1();
m_atLineStart = false;
m_delimited = false;
lvalp->ident = makeIdentifier(m_buffer16.data(), m_buffer16.size());
m_buffer16.resize(0);
token = STRING;
// Fall through into returnToken.
returnToken: {
int lineNumber = m_lineNumber;
llocp->first_line = lineNumber;
llocp->last_line = lineNumber;
llocp->first_column = startOffset;
llocp->last_column = currentOffset();
m_lastToken = token;
return token;
}
returnError:
m_error = true;
return -1;
}