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// Copyright (C) Filippo Cucchetto <filippocucchetto@gmail.com>
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
#include "nimindenter.h"
#include "../tools/nimlexer.h"
#include <texteditor/icodestylepreferences.h>
#include <texteditor/tabsettings.h>
#include <texteditor/simplecodestylepreferences.h>
#include <texteditor/tabsettings.h>
#include <QSet>
#include <QDebug>
namespace Nim {
class NimIndenter final : public TextEditor::TextIndenter
{
public:
explicit NimIndenter(QTextDocument *doc)
: TextEditor::TextIndenter(doc)
{}
bool isElectricCharacter(const QChar &ch) const final
{
return ch == QLatin1Char(':') || ch == QLatin1Char('=');
}
void indentBlock(const QTextBlock &block,
const QChar &typedChar,
const TextEditor::TabSettings &settings,
int cursorPositionInEditor = -1) final;
private:
bool startsBlock(const QString &line, int state) const;
bool endsBlock(const QString &line, int state) const;
int calculateIndentationDiff(const QString &previousLine,
int previousState,
int indentSize) const;
};
static QString rightTrimmed(const QString &str)
{
int n = str.size() - 1;
for (; n >= 0; --n) {
if (!str.at(n).isSpace())
return str.left(n + 1);
}
return QString();
}
void NimIndenter::indentBlock(const QTextBlock &block,
const QChar &typedChar,
const TextEditor::TabSettings &settings,
int cursorPositionInEditor)
{
Q_UNUSED(typedChar)
Q_UNUSED(cursorPositionInEditor)
const QString currentLine = block.text();
const QTextBlock previousBlock = block.previous();
const QString previousLine = previousBlock.text();
const int previousState = previousBlock.userState();
if (!previousBlock.isValid()) {
settings.indentLine(block, 0);
return;
}
// Calculate indentation
int indentation = 0;
if (rightTrimmed(currentLine).isEmpty()) {
// Current line is empty so we calculate indentation based on previous line
const int indentationDiff = calculateIndentationDiff(previousLine, previousState, settings.m_indentSize);
indentation = settings.indentationColumn(previousLine) + indentationDiff;
}
else {
// We don't change indentation if the line is already indented.
// This is safer but sub optimal
indentation = settings.indentationColumn(block.text());
}
// Sets indentation
settings.indentLine(block, std::max(0, indentation));
}
bool NimIndenter::startsBlock(const QString &line, int state) const
{
NimLexer lexer(line.constData(), line.size(), static_cast<NimLexer::State>(state));
// Read until end of line and save the last token
NimLexer::Token previous;
NimLexer::Token current = lexer.next();
while (current.type != NimLexer::TokenType::EndOfText) {
switch (current.type) {
case NimLexer::TokenType::Comment:
case NimLexer::TokenType::Documentation:
break;
default:
previous = current;
break;
}
current = lexer.next();
}
// electric characters start a new block, and are operators
if (previous.type == NimLexer::TokenType::Operator) {
QStringView ref = QStringView(line).mid(previous.begin, previous.length);
return ref.isEmpty() ? false : isElectricCharacter(ref.at(0));
}
// some keywords starts a new block
if (previous.type == NimLexer::TokenType::Keyword) {
QStringView ref = QStringView(line).mid(previous.begin, previous.length);
return ref == QLatin1String("type")
|| ref == QLatin1String("var")
|| ref == QLatin1String("let")
|| ref == QLatin1String("enum")
|| ref == QLatin1String("object");
}
return false;
}
bool NimIndenter::endsBlock(const QString &line, int state) const
{
NimLexer lexer(line.constData(), line.size(), static_cast<NimLexer::State>(state));
// Read until end of line and save the last tokens
NimLexer::Token previous;
NimLexer::Token current = lexer.next();
while (current.type != NimLexer::TokenType::EndOfText) {
previous = current;
current = lexer.next();
}
// Some keywords end a block
if (previous.type == NimLexer::TokenType::Keyword) {
QStringView ref = QStringView(line).mid(previous.begin, previous.length);
return ref == QLatin1String("return")
|| ref == QLatin1String("break")
|| ref == QLatin1String("continue");
}
return false;
}
int NimIndenter::calculateIndentationDiff(const QString &previousLine, int previousState, int indentSize) const
{
if (previousLine.isEmpty())
return 0;
if (startsBlock(previousLine, previousState))
return indentSize;
if (endsBlock(previousLine, previousState))
return -indentSize;
return 0;
}
TextEditor::Indenter *createNimIndenter(QTextDocument *doc)
{
return new NimIndenter(doc);
}
} // Nim
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