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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 "textutils.h"
#include <QTextDocument>
#include <QTextBlock>
namespace Utils {
namespace Text {
bool convertPosition(const QTextDocument *document, int pos, int *line, int *column)
{
QTextBlock block = document->findBlock(pos);
if (!block.isValid()) {
(*line) = -1;
(*column) = -1;
return false;
} else {
// line and column are both 1-based
(*line) = block.blockNumber() + 1;
(*column) = pos - block.position() + 1;
return true;
}
}
OptionalLineColumn convertPosition(const QTextDocument *document, int pos)
{
OptionalLineColumn optional;
QTextBlock block = document->findBlock(pos);
if (block.isValid())
optional.emplace(block.blockNumber() + 1, pos - block.position() + 1);
return optional;
}
int positionInText(const QTextDocument *textDocument, int line, int column)
{
// Deduct 1 from line and column since they are 1-based.
// Column should already be converted from UTF-8 byte offset to the TextEditor column.
return textDocument->findBlockByNumber(line - 1).position() + column - 1;
}
QString textAt(QTextCursor tc, int pos, int length)
{
if (pos < 0)
pos = 0;
tc.movePosition(QTextCursor::End);
if (pos + length > tc.position())
length = tc.position() - pos;
tc.setPosition(pos);
tc.setPosition(pos + length, QTextCursor::KeepAnchor);
// selectedText() returns U+2029 (PARAGRAPH SEPARATOR) instead of newline
return tc.selectedText().replace(QChar::ParagraphSeparator, QLatin1Char('\n'));
}
QTextCursor selectAt(QTextCursor textCursor, int line, int column, uint length)
{
if (line < 1)
line = 1;
if (column < 1)
column = 1;
const int anchorPosition = positionInText(textCursor.document(), line, column);
textCursor.setPosition(anchorPosition);
textCursor.setPosition(anchorPosition + int(length), QTextCursor::KeepAnchor);
return textCursor;
}
QTextCursor flippedCursor(const QTextCursor &cursor)
{
QTextCursor flipped = cursor;
flipped.clearSelection();
flipped.setPosition(cursor.anchor(), QTextCursor::KeepAnchor);
return flipped;
}
static bool isValidIdentifierChar(const QChar &c)
{
return c.isLetter()
|| c.isNumber()
|| c == QLatin1Char('_')
|| c.isHighSurrogate()
|| c.isLowSurrogate();
}
static bool isAfterOperatorKeyword(QTextCursor cursor)
{
cursor.movePosition(QTextCursor::PreviousWord);
cursor.movePosition(QTextCursor::EndOfWord, QTextCursor::KeepAnchor);
return cursor.selectedText() == "operator";
}
QTextCursor wordStartCursor(const QTextCursor &textCursor)
{
const int originalPosition = textCursor.position();
QTextCursor cursor(textCursor);
cursor.movePosition(QTextCursor::StartOfWord);
const int wordStartPosition = cursor.position();
if (originalPosition == wordStartPosition) {
// Cursor is not on an identifier, check whether we are right after one.
const QChar c = textCursor.document()->characterAt(originalPosition - 1);
if (isValidIdentifierChar(c))
cursor.movePosition(QTextCursor::PreviousWord);
}
if (isAfterOperatorKeyword(cursor))
cursor.movePosition(QTextCursor::PreviousWord);
return cursor;
}
QString wordUnderCursor(const QTextCursor &cursor)
{
QTextCursor tc(cursor);
tc.select(QTextCursor::WordUnderCursor);
return tc.selectedText();
}
int utf8NthLineOffset(const QTextDocument *textDocument, const QByteArray &buffer, int line)
{
if (textDocument->blockCount() < line)
return -1;
if (textDocument->characterCount() == buffer.size() + 1)
return textDocument->findBlockByNumber(line - 1).position();
int utf8Offset = 0;
for (int count = 0; count < line - 1; ++count) {
utf8Offset = buffer.indexOf('\n', utf8Offset);
if (utf8Offset == -1)
return -1; // The line does not exist.
++utf8Offset;
}
return utf8Offset;
}
LineColumn utf16LineColumn(const QByteArray &utf8Buffer, int utf8Offset)
{
LineColumn lineColumn;
lineColumn.line = static_cast<int>(
std::count(utf8Buffer.begin(), utf8Buffer.begin() + utf8Offset, '\n'))
+ 1;
const int startOfLineOffset = utf8Offset ? (utf8Buffer.lastIndexOf('\n', utf8Offset - 1) + 1)
: 0;
lineColumn.column = QString::fromUtf8(
utf8Buffer.mid(startOfLineOffset, utf8Offset - startOfLineOffset))
.length()
+ 1;
return lineColumn;
}
QString utf16LineTextInUtf8Buffer(const QByteArray &utf8Buffer, int currentUtf8Offset)
{
const int lineStartUtf8Offset = currentUtf8Offset
? (utf8Buffer.lastIndexOf('\n', currentUtf8Offset - 1) + 1)
: 0;
const int lineEndUtf8Offset = utf8Buffer.indexOf('\n', currentUtf8Offset);
return QString::fromUtf8(
utf8Buffer.mid(lineStartUtf8Offset, lineEndUtf8Offset - lineStartUtf8Offset));
}
static bool isByteOfMultiByteCodePoint(unsigned char byte)
{
return byte & 0x80; // Check if most significant bit is set
}
bool utf8AdvanceCodePoint(const char *¤t)
{
if (Q_UNLIKELY(*current == '\0'))
return false;
// Process multi-byte UTF-8 code point (non-latin1)
if (Q_UNLIKELY(isByteOfMultiByteCodePoint(*current))) {
unsigned trailingBytesCurrentCodePoint = 1;
for (unsigned char c = (*current) << 2; isByteOfMultiByteCodePoint(c); c <<= 1)
++trailingBytesCurrentCodePoint;
current += trailingBytesCurrentCodePoint + 1;
// Process single-byte UTF-8 code point (latin1)
} else {
++current;
}
return true;
}
void applyReplacements(QTextDocument *doc, const Replacements &replacements)
{
if (replacements.empty())
return;
int fullOffsetShift = 0;
QTextCursor editCursor(doc);
editCursor.beginEditBlock();
for (const Text::Replacement &replacement : replacements) {
editCursor.setPosition(replacement.offset + fullOffsetShift);
editCursor.movePosition(QTextCursor::NextCharacter,
QTextCursor::KeepAnchor,
replacement.length);
editCursor.removeSelectedText();
editCursor.insertText(replacement.text);
fullOffsetShift += replacement.text.length() - replacement.length;
}
editCursor.endEditBlock();
}
} // Text
} // Utils
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