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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
#include "qmlexpressionundercursor.h"
#include <qmljs/parser/qmljsast_p.h>
#include <qmljs/qmljsscanner.h>
#include <QTextBlock>
#include <QDebug>
using namespace QmlJS;
using namespace QmlJS::AST;
namespace {
class ExpressionUnderCursor
{
QTextCursor _cursor;
Scanner scanner;
public:
int start = 0;
int end = 0;
int startState(const QTextBlock &block) const
{
int state = block.previous().userState();
if (state == -1)
return 0;
return state & 0xff;
}
QString operator()(const QTextCursor &cursor)
{
return process(cursor);
}
int startOfExpression(const QList<Token> &tokens) const
{
return startOfExpression(tokens, tokens.size() - 1);
}
int startOfExpression(const QList<Token> &tokens, int index) const
{
if (index != -1) {
const Token &tk = tokens.at(index);
if (tk.is(Token::Identifier)) {
if (index > 0 && tokens.at(index - 1).is(Token::Dot))
index = startOfExpression(tokens, index - 2);
} else if (tk.is(Token::RightParenthesis)) {
do { --index; }
while (index != -1 && tokens.at(index).isNot(Token::LeftParenthesis));
if (index > 0 && tokens.at(index - 1).is(Token::Identifier))
index = startOfExpression(tokens, index - 1);
} else if (tk.is(Token::RightBracket)) {
do { --index; }
while (index != -1 && tokens.at(index).isNot(Token::LeftBracket));
if (index > 0 && tokens.at(index - 1).is(Token::Identifier))
index = startOfExpression(tokens, index - 1);
}
}
return index;
}
QString process(const QTextCursor &cursor)
{
_cursor = cursor;
QTextBlock block = _cursor.block();
const QString blockText = block.text().left(cursor.positionInBlock());
scanner.setScanComments(false);
const QList<Token> tokens = scanner(blockText, startState(block));
int start = startOfExpression(tokens);
if (start == -1)
return QString();
const Token &tk = tokens.at(start);
return blockText.mid(tk.begin(), tokens.last().end() - tk.begin());
}
};
} // enf of anonymous namespace
using namespace QmlJSEditor;
using namespace QmlJSEditor::Internal;
QmlExpressionUnderCursor::QmlExpressionUnderCursor()
: _expressionNode(nullptr), _expressionOffset(0), _expressionLength(0)
{}
ExpressionNode *QmlExpressionUnderCursor::operator()(const QTextCursor &cursor)
{
_expressionNode = nullptr;
_expressionOffset = -1;
_expressionLength = -1;
ExpressionUnderCursor expressionUnderCursor;
_text = expressionUnderCursor(cursor);
Document::MutablePtr newDoc = Document::create(Utils::FilePath::fromString("<expression>"),
Dialect::JavaScript);
newDoc->setSource(_text);
newDoc->parseExpression();
exprDoc = newDoc;
_expressionNode = exprDoc->expression();
_expressionOffset = cursor.block().position() + expressionUnderCursor.start;
_expressionLength = expressionUnderCursor.end - expressionUnderCursor.start;
return _expressionNode;
}
ExpressionNode *QmlExpressionUnderCursor::expressionNode() const
{
return _expressionNode;
}
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