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camelcasecursor.cpp
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camelcasecursor.cpp
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// Copyright (C) 2019 The Qt Company Ltd.
// Copyright (C) 2019 Andre Hartmann <[email protected]>
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
#include "camelcasecursor.h"
#include "multitextcursor.h"
#include <QLineEdit>
#include <QPlainTextEdit>
namespace GUI {
template<typename C, typename E>
auto moveCursor(C *cursor, E *edit, QTextCursor::MoveOperation direction, QTextCursor::MoveMode mode) -> bool;
template<>
auto moveCursor(QTextCursor *cursor, QPlainTextEdit *, QTextCursor::MoveOperation direction,
QTextCursor::MoveMode mode) -> bool
{
return cursor->movePosition(direction, mode);
}
template<typename C>
auto moveCursor(C *, QLineEdit *edit, QTextCursor::MoveOperation direction, QTextCursor::MoveMode mode) -> bool
{
bool mark = (mode == QTextCursor::KeepAnchor);
switch (direction) {
case QTextCursor::Left:
edit->cursorBackward(mark);
break;
case QTextCursor::WordLeft:
edit->cursorWordBackward(mark);
break;
case QTextCursor::Right:
edit->cursorForward(mark);
break;
case QTextCursor::WordRight:
edit->cursorWordForward(mark);
break;
default:
return false;
}
return edit->cursorPosition() > 0 && edit->cursorPosition() < edit->text().size();
}
template<typename C, typename E>
auto charUnderCursor(C *cursor, E *edit) -> QChar;
template<>
auto charUnderCursor(QTextCursor *cursor, QPlainTextEdit *edit) -> QChar
{
return edit->document()->characterAt(cursor->position());
}
template<typename C>
auto charUnderCursor(C *, QLineEdit *edit) -> QChar
{
const int pos = edit->cursorPosition();
if (pos < 0 || pos >= edit->text().length())
return QChar::Null;
return edit->text().at(pos);
};
template<typename C, typename E>
auto position(C *cursor, E *edit) -> int;
template<>
auto position(QTextCursor *cursor, QPlainTextEdit *) -> int
{
return cursor->position();
}
template<typename C>
auto position(C *, QLineEdit *edit) -> int
{
return edit->cursorPosition();
}
enum class Input {
Upper,
Lower,
Underscore,
Space,
Other
};
template<typename C, typename E>
auto camelCaseLeft(C *cursor, E *edit, QTextCursor::MoveMode mode) -> bool
{
int state = 0;
if (!moveCursor(cursor, edit, QTextCursor::Left, mode))
return false;
for (;;) {
QChar c = charUnderCursor(cursor, edit);
Input input = Input::Other;
if (c.isUpper())
input = Input::Upper;
else if (c.isLower() || c.isDigit())
input = Input::Lower;
else if (c == '_')
input = Input::Underscore;
else if (c.isSpace() && c != QChar::ParagraphSeparator)
input = Input::Space;
else
input = Input::Other;
switch (state) {
case 0:
switch (input) {
case Input::Upper:
state = 1;
break;
case Input::Lower:
state = 2;
break;
case Input::Underscore:
state = 3;
break;
case Input::Space:
state = 4;
break;
default:
moveCursor(cursor, edit, QTextCursor::Right, mode);
return moveCursor(cursor, edit, QTextCursor::WordLeft, mode);
}
break;
case 1:
switch (input) {
case Input::Upper:
break;
default:
return moveCursor(cursor, edit, QTextCursor::Right, mode);
return true;
}
break;
case 2:
switch (input) {
case Input::Upper:
return true;
case Input::Lower:
break;
default:
return moveCursor(cursor, edit, QTextCursor::Right, mode);
return true;
}
break;
case 3:
switch (input) {
case Input::Underscore:
break;
case Input::Upper:
state = 1;
break;
case Input::Lower:
state = 2;
break;
default:
moveCursor(cursor, edit, QTextCursor::Right, mode);
return true;
}
break;
case 4:
switch (input) {
case Input::Space:
break;
case Input::Upper:
state = 1;
break;
case Input::Lower:
state = 2;
break;
case Input::Underscore:
state = 3;
break;
default:
return moveCursor(cursor, edit, QTextCursor::Right, mode);
if (position(cursor, edit) == 0)
return true;
return moveCursor(cursor, edit, QTextCursor::WordLeft, mode);
}
}
if (!moveCursor(cursor, edit, QTextCursor::Left, mode))
return true;
}
}
template<typename C, typename E>
auto camelCaseRight(C *cursor, E *edit, QTextCursor::MoveMode mark) -> bool
{
int state = 0;
for (;;) {
QChar c = charUnderCursor(cursor, edit);
Input input = Input::Other;
if (c.isUpper())
input = Input::Upper;
else if (c.isLower() || c.isDigit())
input = Input::Lower;
else if (c == '_')
input = Input::Underscore;
else if (c.isSpace() && c != QChar::ParagraphSeparator)
input = Input::Space;
else
input = Input::Other;
switch (state) {
case 0:
switch (input) {
case Input::Upper:
state = 4;
break;
case Input::Lower:
state = 1;
break;
case Input::Underscore:
state = 6;
break;
default:
return moveCursor(cursor, edit, QTextCursor::WordRight, mark);
}
break;
case 1:
switch (input) {
case Input::Upper:
return true;
case Input::Lower:
break;
case Input::Underscore:
state = 6;
break;
case Input::Space:
state = 7;
break;
default:
return true;
}
break;
case 2:
switch (input) {
case Input::Upper:
break;
case Input::Lower:
moveCursor(cursor, edit, QTextCursor::Left, mark);
return true;
case Input::Underscore:
state = 6;
break;
case Input::Space:
state = 7;
break;
default:
return true;
}
break;
case 4:
switch (input) {
case Input::Upper:
state = 2;
break;
case Input::Lower:
state = 1;
break;
case Input::Underscore:
state = 6;
break;
case Input::Space:
state = 7;
break;
default:
return true;
}
break;
case 6:
switch (input) {
case Input::Underscore:
break;
case Input::Space:
state = 7;
break;
default:
return true;
}
break;
case 7:
switch (input) {
case Input::Space:
break;
default:
return true;
}
break;
}
if (!moveCursor(cursor, edit, QTextCursor::Right, mark))
return false;
}
}
auto CamelCaseCursor::left(QTextCursor *cursor, QPlainTextEdit *edit, QTextCursor::MoveMode mode) -> bool
{
return camelCaseLeft(cursor, edit, mode);
}
auto CamelCaseCursor::left(MultiTextCursor *cursor, QPlainTextEdit *edit, QTextCursor::MoveMode mode) -> bool
{
bool result = false;
for (QTextCursor &c : *cursor)
result |= CamelCaseCursor::left(&c, edit, mode);
cursor->mergeCursors();
return result;
}
auto CamelCaseCursor::left(QLineEdit *edit, QTextCursor::MoveMode mode) -> bool
{
QTextCursor temp;
return camelCaseLeft(&temp, edit, mode);
}
auto CamelCaseCursor::right(QTextCursor *cursor, QPlainTextEdit *edit, QTextCursor::MoveMode mode) -> bool
{
return camelCaseRight(cursor, edit, mode);
}
auto CamelCaseCursor::right(MultiTextCursor *cursor, QPlainTextEdit *edit, QTextCursor::MoveMode mode) -> bool
{
bool result = false;
for (QTextCursor &c : *cursor)
result |= CamelCaseCursor::right(&c, edit, mode);
cursor->mergeCursors();
return result;
}
auto CamelCaseCursor::right(QLineEdit *edit, QTextCursor::MoveMode mode) -> bool
{
QTextCursor temp;
return camelCaseRight(&temp, edit, mode);
}
} // namespace GUI