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|
/**************************************************************************
**
** This file is part of Qt Creator
**
** Copyright (c) 2011 Nokia Corporation and/or its subsidiary(-ies).
**
** Contact: Nokia Corporation (info@qt.nokia.com)
**
**
** GNU Lesser General Public License Usage
**
** This file may be used under the terms of the GNU Lesser General Public
** License version 2.1 as published by the Free Software Foundation and
** appearing in the file LICENSE.LGPL included in the packaging of this file.
** Please review the following information to ensure the GNU Lesser General
** Public License version 2.1 requirements will be met:
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** Other Usage
**
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
** If you have questions regarding the use of this file, please contact
** Nokia at info@qt.nokia.com.
**
**************************************************************************/
#include "qmljslexer_p.h"
#include "qmljsengine_p.h"
#include "qmljsmemorypool_p.h"
#include <QtCore/QCoreApplication>
#include <QtCore/QVarLengthArray>
#include <QtCore/QDebug>
QT_BEGIN_NAMESPACE
Q_CORE_EXPORT double qstrtod(const char *s00, char const **se, bool *ok);
QT_END_NAMESPACE
using namespace QmlJS;
static int regExpFlagFromChar(const QChar &ch)
{
switch (ch.unicode()) {
case 'g': return Lexer::RegExp_Global;
case 'i': return Lexer::RegExp_IgnoreCase;
case 'm': return Lexer::RegExp_Multiline;
}
return 0;
}
static unsigned char convertHex(ushort c)
{
if (c >= '0' && c <= '9')
return (c - '0');
else if (c >= 'a' && c <= 'f')
return (c - 'a' + 10);
else
return (c - 'A' + 10);
}
static QChar convertHex(QChar c1, QChar c2)
{
return QChar((convertHex(c1.unicode()) << 4) + convertHex(c2.unicode()));
}
static QChar convertUnicode(QChar c1, QChar c2, QChar c3, QChar c4)
{
return QChar((convertHex(c3.unicode()) << 4) + convertHex(c4.unicode()),
(convertHex(c1.unicode()) << 4) + convertHex(c2.unicode()));
}
Lexer::Lexer(Engine *engine)
: _engine(engine)
, _codePtr(0)
, _lastLinePtr(0)
, _tokenLinePtr(0)
, _tokenStartPtr(0)
, _char(QLatin1Char('\n'))
, _errorCode(NoError)
, _currentLineNumber(0)
, _tokenValue(0)
, _parenthesesState(IgnoreParentheses)
, _parenthesesCount(0)
, _stackToken(-1)
, _patternFlags(0)
, _tokenKind(0)
, _tokenLength(0)
, _tokenLine(0)
, _validTokenText(false)
, _prohibitAutomaticSemicolon(false)
, _restrictedKeyword(false)
, _terminator(false)
, _followsClosingBrace(false)
, _delimited(false)
, _qmlMode(true)
{
if (engine)
engine->setLexer(this);
}
QString Lexer::code() const
{
return _code;
}
void Lexer::setCode(const QString &code, int lineno, bool qmlMode)
{
if (_engine)
_engine->setCode(code);
_qmlMode = qmlMode;
_code = code;
_tokenText.clear();
_tokenText.reserve(1024);
_errorMessage.clear();
_tokenSpell = QStringRef();
_codePtr = code.unicode();
_lastLinePtr = _codePtr;
_tokenLinePtr = _codePtr;
_tokenStartPtr = _codePtr;
_char = QLatin1Char('\n');
_errorCode = NoError;
_currentLineNumber = lineno;
_tokenValue = 0;
// parentheses state
_parenthesesState = IgnoreParentheses;
_parenthesesCount = 0;
_stackToken = -1;
_patternFlags = 0;
_tokenLength = 0;
_tokenLine = lineno;
_validTokenText = false;
_prohibitAutomaticSemicolon = false;
_restrictedKeyword = false;
_terminator = false;
_followsClosingBrace = false;
_delimited = false;
}
void Lexer::scanChar()
{
_char = *_codePtr++;
if (_char == QLatin1Char('\n')) {
_lastLinePtr = _codePtr; // points to the first character after the newline
++_currentLineNumber;
}
}
int Lexer::lex()
{
const int previousTokenKind = _tokenKind;
_tokenSpell = QStringRef();
_tokenKind = scanToken();
_tokenLength = _codePtr - _tokenStartPtr - 1;
_delimited = false;
_restrictedKeyword = false;
_followsClosingBrace = (previousTokenKind == T_RBRACE);
// update the flags
switch (_tokenKind) {
case T_LBRACE:
case T_SEMICOLON:
_delimited = true;
break;
case T_IF:
case T_FOR:
case T_WHILE:
case T_WITH:
_parenthesesState = CountParentheses;
_parenthesesCount = 0;
break;
case T_DO:
_parenthesesState = BalancedParentheses;
break;
case T_CONTINUE:
case T_BREAK:
case T_RETURN:
case T_THROW:
_restrictedKeyword = true;
break;
} // switch
// update the parentheses state
switch (_parenthesesState) {
case IgnoreParentheses:
break;
case CountParentheses:
if (_tokenKind == T_RPAREN) {
--_parenthesesCount;
if (_parenthesesCount == 0)
_parenthesesState = BalancedParentheses;
} else if (_tokenKind == T_LPAREN) {
++_parenthesesCount;
}
break;
case BalancedParentheses:
_parenthesesState = IgnoreParentheses;
break;
} // switch
return _tokenKind;
}
bool Lexer::isUnicodeEscapeSequence(const QChar *chars)
{
if (isHexDigit(chars[0]) && isHexDigit(chars[1]) && isHexDigit(chars[2]) && isHexDigit(chars[3]))
return true;
return false;
}
QChar Lexer::decodeUnicodeEscapeCharacter(bool *ok)
{
if (_char == QLatin1Char('u') && isUnicodeEscapeSequence(&_codePtr[0])) {
scanChar(); // skip u
const QChar c1 = _char;
scanChar();
const QChar c2 = _char;
scanChar();
const QChar c3 = _char;
scanChar();
const QChar c4 = _char;
scanChar();
if (ok)
*ok = true;
return convertUnicode(c1, c2, c3, c4);
}
*ok = false;
return QChar();
}
int Lexer::scanToken()
{
if (_stackToken != -1) {
int tk = _stackToken;
_stackToken = -1;
return tk;
}
_terminator = false;
again:
_validTokenText = false;
_tokenLinePtr = _lastLinePtr;
while (_char.isSpace()) {
if (_char == QLatin1Char('\n')) {
_tokenLinePtr = _codePtr;
if (_restrictedKeyword) {
// automatic semicolon insertion
_tokenLine = _currentLineNumber;
_tokenStartPtr = _codePtr - 1; // ### TODO: insert it before the optional \r sequence.
return T_SEMICOLON;
} else {
_terminator = true;
syncProhibitAutomaticSemicolon();
}
}
scanChar();
}
_tokenStartPtr = _codePtr - 1;
_tokenLine = _currentLineNumber;
if (_char.isNull())
return EOF_SYMBOL;
const QChar ch = _char;
scanChar();
switch (ch.unicode()) {
case '~': return T_TILDE;
case '}': return T_RBRACE;
case '|':
if (_char == QLatin1Char('|')) {
scanChar();
return T_OR_OR;
} else if (_char == QLatin1Char('=')) {
scanChar();
return T_OR_EQ;
}
return T_OR;
case '{': return T_LBRACE;
case '^':
if (_char == QLatin1Char('=')) {
scanChar();
return T_XOR_EQ;
}
return T_XOR;
case ']': return T_RBRACKET;
case '[': return T_LBRACKET;
case '?': return T_QUESTION;
case '>':
if (_char == QLatin1Char('>')) {
scanChar();
if (_char == QLatin1Char('>')) {
scanChar();
if (_char == QLatin1Char('=')) {
scanChar();
return T_GT_GT_GT_EQ;
}
return T_GT_GT_GT;
} else if (_char == QLatin1Char('=')) {
scanChar();
return T_GT_GT_EQ;
}
return T_GT_GT;
} else if (_char == QLatin1Char('=')) {
scanChar();
return T_GE;
}
return T_GT;
case '=':
if (_char == QLatin1Char('=')) {
scanChar();
if (_char == QLatin1Char('=')) {
scanChar();
return T_EQ_EQ_EQ;
}
return T_EQ_EQ;
}
return T_EQ;
case '<':
if (_char == QLatin1Char('=')) {
scanChar();
return T_LE;
} else if (_char == QLatin1Char('<')) {
scanChar();
if (_char == QLatin1Char('=')) {
scanChar();
return T_LT_LT_EQ;
}
return T_LT_LT;
}
return T_LT;
case ';': return T_SEMICOLON;
case ':': return T_COLON;
case '/':
if (_char == QLatin1Char('*')) {
scanChar();
while (!_char.isNull()) {
if (_char == QLatin1Char('*')) {
scanChar();
if (_char == QLatin1Char('/')) {
scanChar();
if (_engine) {
_engine->addComment(tokenOffset() + 2, _codePtr - _tokenStartPtr - 1 - 4,
tokenStartLine(), tokenStartColumn() + 2);
}
goto again;
}
} else {
scanChar();
}
}
} else if (_char == QLatin1Char('/')) {
while (!_char.isNull() && _char != QLatin1Char('\n')) {
scanChar();
}
if (_engine) {
_engine->addComment(tokenOffset() + 2, _codePtr - _tokenStartPtr - 1 - 2,
tokenStartLine(), tokenStartColumn() + 2);
}
goto again;
} if (_char == QLatin1Char('=')) {
scanChar();
return T_DIVIDE_EQ;
}
return T_DIVIDE_;
case '.':
if (_char.isDigit()) {
QVarLengthArray<char,32> chars;
chars.append(ch.unicode()); // append the `.'
while (_char.isDigit()) {
chars.append(_char.unicode());
scanChar();
}
if (_char == QLatin1Char('e') || _char == QLatin1Char('E')) {
if (_codePtr[0].isDigit() || ((_codePtr[0] == QLatin1Char('+') || _codePtr[0] == QLatin1Char('-')) &&
_codePtr[1].isDigit())) {
chars.append(_char.unicode());
scanChar(); // consume `e'
if (_char == QLatin1Char('+') || _char == QLatin1Char('-')) {
chars.append(_char.unicode());
scanChar(); // consume the sign
}
while (_char.isDigit()) {
chars.append(_char.unicode());
scanChar();
}
}
}
chars.append('\0');
const char *begin = chars.constData();
const char *end = 0;
bool ok = false;
_tokenValue = qstrtod(begin, &end, &ok);
if (end - begin != chars.size() - 1) {
_errorCode = IllegalExponentIndicator;
_errorMessage = QCoreApplication::translate("QmlParser", "Illegal syntax for exponential number");
return T_ERROR;
}
return T_NUMERIC_LITERAL;
}
return T_DOT;
case '-':
if (_char == QLatin1Char('=')) {
scanChar();
return T_MINUS_EQ;
} else if (_char == QLatin1Char('-')) {
scanChar();
if (_terminator && !_delimited && !_prohibitAutomaticSemicolon) {
_stackToken = T_MINUS_MINUS;
return T_SEMICOLON;
}
return T_MINUS_MINUS;
}
return T_MINUS;
case ',': return T_COMMA;
case '+':
if (_char == QLatin1Char('=')) {
scanChar();
return T_PLUS_EQ;
} else if (_char == QLatin1Char('+')) {
scanChar();
if (_terminator && !_delimited && !_prohibitAutomaticSemicolon) {
_stackToken = T_PLUS_PLUS;
return T_SEMICOLON;
}
return T_PLUS_PLUS;
}
return T_PLUS;
case '*':
if (_char == QLatin1Char('=')) {
scanChar();
return T_STAR_EQ;
}
return T_STAR;
case ')': return T_RPAREN;
case '(': return T_LPAREN;
case '&':
if (_char == QLatin1Char('=')) {
scanChar();
return T_AND_EQ;
} else if (_char == QLatin1Char('&')) {
scanChar();
return T_AND_AND;
}
return T_AND;
case '%':
if (_char == QLatin1Char('=')) {
scanChar();
return T_REMAINDER_EQ;
}
return T_REMAINDER;
case '!':
if (_char == QLatin1Char('=')) {
scanChar();
if (_char == QLatin1Char('=')) {
scanChar();
return T_NOT_EQ_EQ;
}
return T_NOT_EQ;
}
return T_NOT;
case '\'':
case '"': {
const QChar quote = ch;
bool multilineStringLiteral = false;
const QChar *startCode = _codePtr;
if (_engine) {
while (!_char.isNull()) {
if (_char == QLatin1Char('\n') || _char == QLatin1Char('\\')) {
break;
} else if (_char == quote) {
_tokenSpell = _engine->midRef(startCode - _code.unicode() - 1, _codePtr - startCode);
scanChar();
return T_STRING_LITERAL;
}
scanChar();
}
}
_validTokenText = true;
_tokenText.resize(0);
startCode--;
while (startCode != _codePtr - 1)
_tokenText += *startCode++;
while (! _char.isNull()) {
if (_char == QLatin1Char('\n')) {
multilineStringLiteral = true;
_tokenText += _char;
scanChar();
} else if (_char == quote) {
scanChar();
if (_engine)
_tokenSpell = _engine->newStringRef(_tokenText);
return multilineStringLiteral ? T_MULTILINE_STRING_LITERAL : T_STRING_LITERAL;
} else if (_char == QLatin1Char('\\')) {
scanChar();
QChar u;
bool ok = false;
switch (_char.unicode()) {
// unicode escape sequence
case 'u':
u = decodeUnicodeEscapeCharacter(&ok);
if (! ok)
u = _char;
break;
// hex escape sequence
case 'x':
case 'X':
if (isHexDigit(_codePtr[0]) && isHexDigit(_codePtr[1])) {
scanChar();
const QChar c1 = _char;
scanChar();
const QChar c2 = _char;
scanChar();
u = convertHex(c1, c2);
} else {
u = _char;
}
break;
// single character escape sequence
case '\\': u = QLatin1Char('\\'); scanChar(); break;
case '\'': u = QLatin1Char('\''); scanChar(); break;
case '\"': u = QLatin1Char('\"'); scanChar(); break;
case 'b': u = QLatin1Char('\b'); scanChar(); break;
case 'f': u = QLatin1Char('\f'); scanChar(); break;
case 'n': u = QLatin1Char('\n'); scanChar(); break;
case 'r': u = QLatin1Char('\r'); scanChar(); break;
case 't': u = QLatin1Char('\t'); scanChar(); break;
case 'v': u = QLatin1Char('\v'); scanChar(); break;
case '0':
if (! _codePtr[1].isDigit()) {
scanChar();
u = QLatin1Char('\0');
} else {
// ### parse deprecated octal escape sequence ?
u = _char;
}
break;
case '\r':
while (_char == QLatin1Char('\r'))
scanChar();
if (_char == QLatin1Char('\n')) {
u = _char;
scanChar();
} else {
u = QLatin1Char('\n');
}
break;
case '\n':
u = _char;
scanChar();
break;
default:
// non escape character
u = _char;
scanChar();
}
_tokenText += u;
} else {
_tokenText += _char;
scanChar();
}
}
_errorCode = UnclosedStringLiteral;
_errorMessage = QCoreApplication::translate("QmlParser", "Unclosed string at end of line");
return T_ERROR;
}
default:
if (ch.isLetter() || ch == QLatin1Char('$') || ch == QLatin1Char('_') || (ch == QLatin1Char('\\') && _char == QLatin1Char('u'))) {
bool identifierWithEscapeChars = false;
if (ch == QLatin1Char('\\')) {
identifierWithEscapeChars = true;
_tokenText.resize(0);
bool ok = false;
_tokenText += decodeUnicodeEscapeCharacter(&ok);
_validTokenText = true;
if (! ok) {
_errorCode = IllegalUnicodeEscapeSequence;
_errorMessage = QCoreApplication::translate("QmlParser", "Illegal unicode escape sequence");
return T_ERROR;
}
}
while (true) {
if (_char.isLetterOrNumber() || _char == QLatin1Char('$') || _char == QLatin1Char('_')) {
if (identifierWithEscapeChars)
_tokenText += _char;
scanChar();
} else if (_char == QLatin1Char('\\') && _codePtr[0] == QLatin1Char('u')) {
if (! identifierWithEscapeChars) {
identifierWithEscapeChars = true;
_tokenText.resize(0);
_tokenText.insert(0, _tokenStartPtr, _codePtr - _tokenStartPtr - 1);
_validTokenText = true;
}
scanChar(); // skip '\\'
bool ok = false;
_tokenText += decodeUnicodeEscapeCharacter(&ok);
if (! ok) {
_errorCode = IllegalUnicodeEscapeSequence;
_errorMessage = QCoreApplication::translate("QmlParser", "Illegal unicode escape sequence");
return T_ERROR;
}
} else {
_tokenLength = _codePtr - _tokenStartPtr - 1;
int kind = T_IDENTIFIER;
if (! identifierWithEscapeChars)
kind = classify(_tokenStartPtr, _tokenLength, _qmlMode);
if (_engine) {
if (kind == T_IDENTIFIER && identifierWithEscapeChars)
_tokenSpell = _engine->newStringRef(_tokenText);
else
_tokenSpell = _engine->midRef(_tokenStartPtr - _code.unicode(), _tokenLength);
}
return kind;
}
}
} else if (ch.isDigit()) {
if (ch != QLatin1Char('0')) {
double integer = ch.unicode() - '0';
QChar n = _char;
const QChar *code = _codePtr;
while (n.isDigit()) {
integer = integer * 10 + (n.unicode() - '0');
n = *code++;
}
if (n != QLatin1Char('.') && n != QLatin1Char('e') && n != QLatin1Char('E')) {
if (code != _codePtr) {
_codePtr = code - 1;
scanChar();
}
_tokenValue = integer;
return T_NUMERIC_LITERAL;
}
}
QVarLengthArray<char,32> chars;
chars.append(ch.unicode());
if (ch == QLatin1Char('0') && (_char == QLatin1Char('x') || _char == QLatin1Char('X'))) {
// parse hex integer literal
chars.append(_char.unicode());
scanChar(); // consume `x'
while (isHexDigit(_char)) {
chars.append(_char.unicode());
scanChar();
}
_tokenValue = integerFromString(chars.constData(), chars.size(), 16);
return T_NUMERIC_LITERAL;
}
// decimal integer literal
while (_char.isDigit()) {
chars.append(_char.unicode());
scanChar(); // consume the digit
}
if (_char == QLatin1Char('.')) {
chars.append(_char.unicode());
scanChar(); // consume `.'
while (_char.isDigit()) {
chars.append(_char.unicode());
scanChar();
}
if (_char == QLatin1Char('e') || _char == QLatin1Char('E')) {
if (_codePtr[0].isDigit() || ((_codePtr[0] == QLatin1Char('+') || _codePtr[0] == QLatin1Char('-')) &&
_codePtr[1].isDigit())) {
chars.append(_char.unicode());
scanChar(); // consume `e'
if (_char == QLatin1Char('+') || _char == QLatin1Char('-')) {
chars.append(_char.unicode());
scanChar(); // consume the sign
}
while (_char.isDigit()) {
chars.append(_char.unicode());
scanChar();
}
}
}
} else if (_char == QLatin1Char('e') || _char == QLatin1Char('E')) {
if (_codePtr[0].isDigit() || ((_codePtr[0] == QLatin1Char('+') || _codePtr[0] == QLatin1Char('-')) &&
_codePtr[1].isDigit())) {
chars.append(_char.unicode());
scanChar(); // consume `e'
if (_char == QLatin1Char('+') || _char == QLatin1Char('-')) {
chars.append(_char.unicode());
scanChar(); // consume the sign
}
while (_char.isDigit()) {
chars.append(_char.unicode());
scanChar();
}
}
}
chars.append('\0');
const char *begin = chars.constData();
const char *end = 0;
bool ok = false;
_tokenValue = qstrtod(begin, &end, &ok);
if (end - begin != chars.size() - 1) {
_errorCode = IllegalExponentIndicator;
_errorMessage = QCoreApplication::translate("QmlParser", "Illegal syntax for exponential number");
return T_ERROR;
}
return T_NUMERIC_LITERAL;
}
break;
}
return T_ERROR;
}
bool Lexer::scanRegExp(RegExpBodyPrefix prefix)
{
_tokenText.resize(0);
_validTokenText = true;
_patternFlags = 0;
if (prefix == EqualPrefix)
_tokenText += QLatin1Char('=');
while (true) {
switch (_char.unicode()) {
case 0: // eof
case '\n': case '\r': // line terminator
_errorMessage = QCoreApplication::translate("QmlParser", "Unterminated regular expression literal");
return false;
case '/':
scanChar();
// scan the flags
_patternFlags = 0;
while (isIdentLetter(_char)) {
int flag = regExpFlagFromChar(_char);
if (flag == 0) {
_errorMessage = QCoreApplication::translate("QmlParser", "Invalid regular expression flag '%0'")
.arg(QChar(_char));
return false;
}
_patternFlags |= flag;
scanChar();
}
_tokenLength = _codePtr - _tokenStartPtr - 1;
return true;
case '\\':
// regular expression backslash sequence
_tokenText += _char;
scanChar();
if (_char.isNull() || isLineTerminator()) {
_errorMessage = QCoreApplication::translate("QmlParser", "Unterminated regular expression backslash sequence");
return false;
}
_tokenText += _char;
scanChar();
break;
case '[':
// regular expression class
_tokenText += _char;
scanChar();
while (! _char.isNull() && ! isLineTerminator()) {
if (_char == QLatin1Char(']'))
break;
else if (_char == QLatin1Char('\\')) {
// regular expression backslash sequence
_tokenText += _char;
scanChar();
if (_char.isNull() || isLineTerminator()) {
_errorMessage = QCoreApplication::translate("QmlParser", "Unterminated regular expression backslash sequence");
return false;
}
_tokenText += _char;
scanChar();
} else {
_tokenText += _char;
scanChar();
}
}
if (_char != QLatin1Char(']')) {
_errorMessage = QCoreApplication::translate("QmlParser", "Unterminated regular expression class");
return false;
}
_tokenText += _char;
scanChar(); // skip ]
break;
default:
_tokenText += _char;
scanChar();
} // switch
} // while
return false;
}
bool Lexer::isLineTerminator() const
{
return (_char == QLatin1Char('\n') || _char == QLatin1Char('\r'));
}
bool Lexer::isIdentLetter(QChar ch)
{
// ASCII-biased, since all reserved words are ASCII, aand hence the
// bulk of content to be parsed.
if ((ch >= QLatin1Char('a') && ch <= QLatin1Char('z'))
|| (ch >= QLatin1Char('A') && ch <= QLatin1Char('Z'))
|| ch == QLatin1Char('$')
|| ch == QLatin1Char('_'))
return true;
if (ch.unicode() < 128)
return false;
return ch.isLetterOrNumber();
}
bool Lexer::isDecimalDigit(ushort c)
{
return (c >= '0' && c <= '9');
}
bool Lexer::isHexDigit(QChar c)
{
return ((c >= QLatin1Char('0') && c <= QLatin1Char('9'))
|| (c >= QLatin1Char('a') && c <= QLatin1Char('f'))
|| (c >= QLatin1Char('A') && c <= QLatin1Char('F')));
}
bool Lexer::isOctalDigit(ushort c)
{
return (c >= '0' && c <= '7');
}
int Lexer::tokenKind() const
{
return _tokenKind;
}
int Lexer::tokenOffset() const
{
return _tokenStartPtr - _code.unicode();
}
int Lexer::tokenLength() const
{
return _tokenLength;
}
int Lexer::tokenStartLine() const
{
return _tokenLine;
}
int Lexer::tokenStartColumn() const
{
return _tokenStartPtr - _tokenLinePtr + 1;
}
int Lexer::tokenEndLine() const
{
return _currentLineNumber;
}
int Lexer::tokenEndColumn() const
{
return _codePtr - _lastLinePtr;
}
QStringRef Lexer::tokenSpell() const
{
return _tokenSpell;
}
double Lexer::tokenValue() const
{
return _tokenValue;
}
QString Lexer::tokenText() const
{
if (_validTokenText)
return _tokenText;
if (_tokenKind == T_STRING_LITERAL)
return QString(_tokenStartPtr + 1, _tokenLength - 2);
return QString(_tokenStartPtr, _tokenLength);
}
Lexer::Error Lexer::errorCode() const
{
return _errorCode;
}
QString Lexer::errorMessage() const
{
return _errorMessage;
}
void Lexer::syncProhibitAutomaticSemicolon()
{
if (_parenthesesState == BalancedParentheses) {
// we have seen something like "if (foo)", which means we should
// never insert an automatic semicolon at this point, since it would
// then be expanded into an empty statement (ECMA-262 7.9.1)
_prohibitAutomaticSemicolon = true;
_parenthesesState = IgnoreParentheses;
} else {
_prohibitAutomaticSemicolon = false;
}
}
bool Lexer::prevTerminator() const
{
return _terminator;
}
bool Lexer::followsClosingBrace() const
{
return _followsClosingBrace;
}
bool Lexer::canInsertAutomaticSemicolon(int token) const
{
return token == T_RBRACE
|| token == EOF_SYMBOL
|| _terminator
|| _followsClosingBrace;
}
bool Lexer::scanDirectives(Directives *directives)
{
if (_qmlMode) {
// the directives are a Javascript-only extension.
return false;
}
lex(); // fetch the first token
if (_tokenKind != T_DOT)
return true;
do {
lex(); // skip T_DOT
const int lineNumber = tokenStartLine();
if (! (_tokenKind == T_IDENTIFIER || _tokenKind == T_RESERVED_WORD))
return false; // expected a valid QML/JS directive
const QString directiveName = tokenText();
if (! (directiveName == QLatin1String("pragma") ||
directiveName == QLatin1String("import")))
return false; // not a valid directive name
// it must be a pragma or an import directive.
if (directiveName == QLatin1String("pragma")) {
// .pragma library
if (! (lex() == T_IDENTIFIER && tokenText() == QLatin1String("library")))
return false; // expected `library
// we found a .pragma library directive
directives->pragmaLibrary();
} else {
Q_ASSERT(directiveName == QLatin1String("import"));
lex(); // skip .import
QString pathOrUri;
QString version;
bool fileImport = false; // file or uri import
if (_tokenKind == T_STRING_LITERAL) {
// .import T_STRING_LITERAL as T_IDENTIFIER
fileImport = true;
pathOrUri = tokenText();
} else if (_tokenKind == T_IDENTIFIER) {
// .import T_IDENTIFIER (. T_IDENTIFIER)* T_NUMERIC_LITERAL as T_IDENTIFIER
pathOrUri = tokenText();
lex(); // skip the first T_IDENTIFIER
for (; _tokenKind == T_DOT; lex()) {
if (lex() != T_IDENTIFIER)
return false;
pathOrUri += QLatin1Char('.');
pathOrUri += tokenText();
}
if (_tokenKind != T_NUMERIC_LITERAL)
return false; // expected the module version number
version = tokenText();
}
//
// recognize the mandatory `as' followed by the module name
//
if (! (lex() == T_RESERVED_WORD && tokenText() == QLatin1String("as")))
return false; // expected `as'
if (lex() != T_IDENTIFIER)
return false; // expected module name
const QString module = tokenText();
if (fileImport)
directives->importFile(pathOrUri, module);
else
directives->importModule(pathOrUri, version, module);
}
if (tokenStartLine() != lineNumber)
return false; // the directives cannot span over multiple lines
// fetch the first token after the .pragma/.import directive
lex();
} while (_tokenKind == T_DOT);
return true;
}
#include "qmljskeywords_p.h"
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