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Fix lexer handling of escape sequences in string 

The lexer handled escape sequences inside string literals
wrongly which could led to follow-up problems like wrong
offsets or even lines of tokens.

Change-Id: Ief14dda77f9079931a7d19ea549017a1d59c2d0b
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>
This commit is contained in:
Christian Stenger 2020-04-20 15:23:12 +02:00
parent 0e393fa01f
commit dc56e57cc5
2 changed files with 31 additions and 1 deletions
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1
src/qml/parser/qqmljslexer.cpp
View File

@ -925,6 +925,7 @@ int Lexer::scanString(ScanStringMode mode)
// rewind by one char, so things gets scanned correctly
--_codePtr;
--_currentColumnNumber;
_validTokenText = true;
_tokenText = QString(startCode, _codePtr - startCode);

31
tests/auto/qml/qqmlparser/tst_qqmlparser.cpp
View File

@ -288,7 +288,7 @@ void tst_qqmlparser::stringLiteral()
Engine engine;
Lexer lexer(&engine);
QLatin1String code("'hello string'");
QString code("'hello string'");
lexer.setCode(code , 1);
Parser parser(&engine);
QVERIFY(parser.parseExpression());
@ -299,6 +299,35 @@ void tst_qqmlparser::stringLiteral()
QCOMPARE(literal->value, "hello string");
QCOMPARE(literal->firstSourceLocation().begin(), 0u);
QCOMPARE(literal->lastSourceLocation().end(), quint32(code.size()));
// test for correct handling escape sequences inside strings
QLatin1String leftCode("'hello\\n\\tstring'");
QLatin1String plusCode(" + ");
QLatin1String rightCode("'\\nbye'");
code = leftCode + plusCode + rightCode;
lexer.setCode(code , 1);
QVERIFY(parser.parseExpression());
expression = parser.expression();
QVERIFY(expression);
auto *binaryExpression = QQmlJS::AST::cast<QQmlJS::AST::BinaryExpression *>(expression);
QVERIFY(binaryExpression);
literal = QQmlJS::AST::cast<QQmlJS::AST::StringLiteral *>(binaryExpression->left);
QVERIFY(literal);
QCOMPARE(literal->value, "hello\n\tstring");
QCOMPARE(literal->firstSourceLocation().begin(), 0u);
QCOMPARE(literal->firstSourceLocation().startLine, 1u);
QCOMPARE(literal->lastSourceLocation().end(), quint32(leftCode.size()));
QVERIFY(binaryExpression->right);
literal = QQmlJS::AST::cast<QQmlJS::AST::StringLiteral *>(binaryExpression->right);
QVERIFY(literal);
QCOMPARE(literal->value, "\nbye");
quint32 offset = quint32(leftCode.size() + plusCode.size());
QCOMPARE(literal->firstSourceLocation().begin(), offset);
QCOMPARE(literal->firstSourceLocation().startLine, 1u);
QCOMPARE(literal->lastSourceLocation().end(), quint32(code.size()));
}
void tst_qqmlparser::noSubstitutionTemplateLiteral()