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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0+ OR GPL-3.0 WITH Qt-GPL-exception-1.0
#include "qmljsautocompleter.h"
#include <qmljs/qmljsscanner.h>
#include <QTextDocument>
#include <QTextCursor>
#include <QTextBlock>
using namespace QmlJSEditor;
using namespace QmlJS;
static int blockStartState(const QTextBlock &block)
{
int state = block.previous().userState();
if (state == -1)
return 0;
else
return state & 0xff;
}
static Token tokenUnderCursor(const QTextCursor &cursor)
{
const QString blockText = cursor.block().text();
const int blockState = blockStartState(cursor.block());
Scanner tokenize;
const QList<Token> tokens = tokenize(blockText, blockState);
const int pos = cursor.positionInBlock();
int tokenIndex = 0;
for (; tokenIndex < tokens.size(); ++tokenIndex) {
const Token &token = tokens.at(tokenIndex);
if (token.is(Token::Comment) || token.is(Token::String)) {
if (pos > token.begin() && pos <= token.end())
break;
} else {
if (pos >= token.begin() && pos < token.end())
break;
}
}
if (tokenIndex != tokens.size())
return tokens.at(tokenIndex);
return Token();
}
static bool shouldInsertMatchingText(QChar lookAhead)
{
switch (lookAhead.unicode()) {
case '{': case '}':
case ']': case ')':
case ';': case ',':
case '"': case '\'':
return true;
default:
if (lookAhead.isSpace())
return true;
return false;
} // switch
}
static bool shouldInsertMatchingText(const QTextCursor &tc)
{
QTextDocument *doc = tc.document();
return shouldInsertMatchingText(doc->characterAt(tc.selectionEnd()));
}
static bool shouldInsertNewline(const QTextCursor &tc)
{
QTextDocument *doc = tc.document();
int pos = tc.selectionEnd();
// count the number of empty lines.
int newlines = 0;
for (int e = doc->characterCount(); pos != e; ++pos) {
const QChar ch = doc->characterAt(pos);
if (! ch.isSpace())
break;
else if (ch == QChar::ParagraphSeparator)
++newlines;
}
if (newlines <= 1 && doc->characterAt(pos) != QLatin1Char('}'))
return true;
return false;
}
static bool isCompleteStringLiteral(QStringView text)
{
if (text.length() < 2)
return false;
const QChar quote = text.at(0);
if (text.at(text.length() - 1) == quote)
return text.at(text.length() - 2) != QLatin1Char('\\'); // ### not exactly.
return false;
}
AutoCompleter::AutoCompleter() = default;
AutoCompleter::~AutoCompleter() = default;
bool AutoCompleter::contextAllowsAutoBrackets(const QTextCursor &cursor,
const QString &textToInsert) const
{
QChar ch;
if (! textToInsert.isEmpty())
ch = textToInsert.at(0);
switch (ch.unicode()) {
case '(':
case '[':
case '{':
case ')':
case ']':
case '}':
case ';':
break;
default:
if (ch.isNull())
break;
return false;
} // end of switch
const Token token = tokenUnderCursor(cursor);
switch (token.kind) {
case Token::Comment:
return false;
case Token::RightBrace:
return false;
case Token::String: {
const QString blockText = cursor.block().text();
const QStringView tokenText = QStringView(blockText).mid(token.offset, token.length);
QChar quote = tokenText.at(0);
// if a string literal doesn't start with a quote, it must be multiline
if (quote != QLatin1Char('"') && quote != QLatin1Char('\'')) {
const int startState = blockStartState(cursor.block());
if ((startState & Scanner::MultiLineMask) == Scanner::MultiLineStringDQuote)
quote = QLatin1Char('"');
else if ((startState & Scanner::MultiLineMask) == Scanner::MultiLineStringSQuote)
quote = QLatin1Char('\'');
}
// never insert ' into string literals, it adds spurious ' when writing contractions
if (ch == QLatin1Char('\''))
return false;
if (ch != quote || isCompleteStringLiteral(tokenText))
break;
return false;
}
default:
break;
} // end of switch
return true;
}
bool AutoCompleter::contextAllowsAutoQuotes(const QTextCursor &cursor,
const QString &textToInsert) const
{
if (!isQuote(textToInsert))
return false;
const Token token = tokenUnderCursor(cursor);
switch (token.kind) {
case Token::Comment:
return false;
case Token::RightBrace:
return false;
case Token::String: {
const QString blockText = cursor.block().text();
const QStringView tokenText = QStringView(blockText).mid(token.offset, token.length);
QChar quote = tokenText.at(0);
// if a string literal doesn't start with a quote, it must be multiline
if (quote != QLatin1Char('"') && quote != QLatin1Char('\'')) {
const int startState = blockStartState(cursor.block());
if ((startState & Scanner::MultiLineMask) == Scanner::MultiLineStringDQuote)
quote = QLatin1Char('"');
else if ((startState & Scanner::MultiLineMask) == Scanner::MultiLineStringSQuote)
quote = QLatin1Char('\'');
}
// never insert ' into string literals, it adds spurious ' when writing contractions
if (textToInsert.at(0) == QLatin1Char('\'') && quote != '\'')
return false;
if (textToInsert.at(0) != quote || isCompleteStringLiteral(tokenText))
break;
return false;
}
default:
break;
} // end of switch
return true;
}
bool AutoCompleter::contextAllowsElectricCharacters(const QTextCursor &cursor) const
{
Token token = tokenUnderCursor(cursor);
switch (token.kind) {
case Token::Comment:
case Token::String:
return false;
default:
return true;
}
}
bool AutoCompleter::isInComment(const QTextCursor &cursor) const
{
return tokenUnderCursor(cursor).is(Token::Comment);
}
QString AutoCompleter::insertMatchingBrace(const QTextCursor &cursor,
const QString &text,
QChar lookAhead,
bool skipChars,
int *skippedChars) const
{
if (text.length() != 1)
return QString();
if (! shouldInsertMatchingText(cursor))
return QString();
const QChar ch = text.at(0);
switch (ch.unicode()) {
case '(':
return QString(QLatin1Char(')'));
case '[':
return QString(QLatin1Char(']'));
case '{':
return QString(); // nothing to do.
case ')':
case ']':
case '}':
case ';':
if (lookAhead == ch && skipChars)
++*skippedChars;
break;
default:
break;
} // end of switch
return QString();
}
QString AutoCompleter::insertMatchingQuote(const QTextCursor &/*tc*/, const QString &text,
QChar lookAhead, bool skipChars, int *skippedChars) const
{
if (isQuote(text)) {
if (lookAhead == text && skipChars)
++*skippedChars;
else
return text;
}
return QString();
}
QString AutoCompleter::insertParagraphSeparator(const QTextCursor &cursor) const
{
if (shouldInsertNewline(cursor)) {
QTextCursor selCursor = cursor;
selCursor.movePosition(QTextCursor::EndOfBlock, QTextCursor::KeepAnchor);
if (! selCursor.selectedText().trimmed().isEmpty())
return QString();
return QLatin1String("}\n");
}
return QLatin1String("}");
}
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