forked from qt-creator/qt-creator
3213e12ce7
The plugin does not only contain a pure editor, but all kind of support for a programming language like project and run support. Change-Id: I1251367c8db2e7a54986415ffc5b860cb210de3c Reviewed-by: Christian Stenger <christian.stenger@qt.io>
128 lines
4.2 KiB
C++
128 lines
4.2 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2016 The Qt Company Ltd.
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** Contact: https://www.qt.io/licensing/
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**
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** This file is part of Qt Creator.
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**
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms
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** and conditions see https://www.qt.io/terms-conditions. For further
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** information use the contact form at https://www.qt.io/contact-us.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 3 as published by the Free Software
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** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
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** included in the packaging of this file. Please review the following
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** information to ensure the GNU General Public License requirements will
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** be met: https://www.gnu.org/licenses/gpl-3.0.html.
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**
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****************************************************************************/
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#include "pythonindenter.h"
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#include "pythonscanner.h"
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#include <texteditor/tabsettings.h>
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#include <algorithm>
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namespace Python {
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static bool isEmptyLine(const QString &t)
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{
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return std::all_of(t.cbegin(), t.cend(), [] (QChar c) { return c.isSpace(); });
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}
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static inline bool isEmptyLine(const QTextBlock &block)
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{
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return isEmptyLine(block.text());
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}
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static QTextBlock previousNonEmptyBlock(const QTextBlock &block)
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{
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QTextBlock result = block;
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while (result.isValid() && isEmptyLine(result))
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result = result.previous();
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return result;
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}
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PythonIndenter::PythonIndenter(QTextDocument *doc)
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: TextEditor::TextIndenter(doc)
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{}
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/**
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* @brief Does given character change indentation level?
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* @param ch Any value
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* @return True if character increases indentation level at the next line
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*/
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bool PythonIndenter::isElectricCharacter(const QChar &ch) const
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{
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return ch == ':';
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}
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int PythonIndenter::indentFor(const QTextBlock &block,
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const TextEditor::TabSettings &tabSettings,
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int /*cursorPositionInEditor*/)
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{
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QTextBlock previousBlock = block.previous();
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if (!previousBlock.isValid())
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return 0;
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// When pasting in actual code, try to skip back past empty lines to an
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// actual code line to find a suitable indentation. This prevents code from
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// not being indented when pasting below an empty line.
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if (!isEmptyLine(block)) {
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const QTextBlock previousNonEmpty = previousNonEmptyBlock(previousBlock);
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if (previousNonEmpty.isValid())
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previousBlock = previousNonEmpty;
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}
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QString previousLine = previousBlock.text();
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int indentation = tabSettings.indentationColumn(previousLine);
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if (isElectricLine(previousLine))
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indentation += tabSettings.m_indentSize;
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else
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indentation = qMax<int>(0, indentation + getIndentDiff(previousLine, tabSettings));
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return indentation;
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}
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/// @return True if electric character is last non-space character at given string
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bool PythonIndenter::isElectricLine(const QString &line) const
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{
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if (line.isEmpty())
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return false;
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// trim spaces in 'if True: '
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int index = line.length() - 1;
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while (index > 0 && line[index].isSpace())
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--index;
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return isElectricCharacter(line[index]);
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}
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/// @return negative indent diff if previous line breaks control flow branch
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int PythonIndenter::getIndentDiff(const QString &previousLine,
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const TextEditor::TabSettings &tabSettings) const
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{
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static const QStringList jumpKeywords = {
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"return", "yield", "break", "continue", "raise", "pass" };
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Internal::Scanner sc(previousLine.constData(), previousLine.length());
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forever {
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Internal::FormatToken tk = sc.read();
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if (tk.format() == Internal::Format_Keyword && jumpKeywords.contains(sc.value(tk)))
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return -tabSettings.m_indentSize;
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if (tk.format() != Internal::Format_Whitespace)
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break;
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}
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return 0;
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}
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} // namespace Python
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