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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 "pythonindenter.h"
#include "pythonscanner.h"
#include <texteditor/tabsettings.h>
#include <algorithm>
namespace Python {
static bool isEmptyLine(const QString &t)
{
return std::all_of(t.cbegin(), t.cend(), [] (QChar c) { return c.isSpace(); });
}
static inline bool isEmptyLine(const QTextBlock &block)
{
return isEmptyLine(block.text());
}
static QTextBlock previousNonEmptyBlock(const QTextBlock &block)
{
QTextBlock result = block;
while (result.isValid() && isEmptyLine(result))
result = result.previous();
return result;
}
class PythonIndenter : public TextEditor::TextIndenter
{
public:
explicit PythonIndenter(QTextDocument *doc)
: TextEditor::TextIndenter(doc)
{}
private:
bool isElectricCharacter(const QChar &ch) const override;
int indentFor(const QTextBlock &block,
const TextEditor::TabSettings &tabSettings,
int cursorPositionInEditor = -1) override;
bool isElectricLine(const QString &line) const;
int getIndentDiff(const QString &previousLine,
const TextEditor::TabSettings &tabSettings) const;
};
/**
* @brief Does given character change indentation level?
* @param ch Any value
* @return True if character increases indentation level at the next line
*/
bool PythonIndenter::isElectricCharacter(const QChar &ch) const
{
return ch == ':';
}
int PythonIndenter::indentFor(const QTextBlock &block,
const TextEditor::TabSettings &tabSettings,
int /*cursorPositionInEditor*/)
{
QTextBlock previousBlock = block.previous();
if (!previousBlock.isValid())
return 0;
// When pasting in actual code, try to skip back past empty lines to an
// actual code line to find a suitable indentation. This prevents code from
// not being indented when pasting below an empty line.
if (!isEmptyLine(block)) {
const QTextBlock previousNonEmpty = previousNonEmptyBlock(previousBlock);
if (previousNonEmpty.isValid())
previousBlock = previousNonEmpty;
}
QString previousLine = previousBlock.text();
int indentation = tabSettings.indentationColumn(previousLine);
if (isElectricLine(previousLine))
indentation += tabSettings.m_indentSize;
else
indentation = qMax<int>(0, indentation + getIndentDiff(previousLine, tabSettings));
return indentation;
}
/// @return True if electric character is last non-space character at given string
bool PythonIndenter::isElectricLine(const QString &line) const
{
if (line.isEmpty())
return false;
// trim spaces in 'if True: '
int index = line.length() - 1;
while (index > 0 && line[index].isSpace())
--index;
return isElectricCharacter(line[index]);
}
/// @return negative indent diff if previous line breaks control flow branch
int PythonIndenter::getIndentDiff(const QString &previousLine,
const TextEditor::TabSettings &tabSettings) const
{
static const QStringList jumpKeywords = {
"return", "yield", "break", "continue", "raise", "pass" };
Internal::Scanner sc(previousLine.constData(), previousLine.length());
forever {
Internal::FormatToken tk = sc.read();
if (tk.format() == Internal::Format_Keyword && jumpKeywords.contains(sc.value(tk)))
return -tabSettings.m_indentSize;
if (tk.format() != Internal::Format_Whitespace)
break;
}
return 0;
}
TextEditor::TextIndenter *createPythonIndenter(QTextDocument *doc)
{
return new PythonIndenter(doc);
}
} // namespace Python
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