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qtbase-opensource-src/examples/widgets/tools/codecs/encodingdialog.cpp

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/****************************************************************************
**
** Copyright (C) 2018 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** BSD License Usage
** Alternatively, you may use this file under the terms of the BSD license
** as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of The Qt Company Ltd nor the names of its
** contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "encodingdialog.h"
#if QT_CONFIG(action)
# include <QAction>
#endif
#include <QDialogButtonBox>
#include <QFormLayout>
#include <QLabel>
#include <QLineEdit>
#include <QVBoxLayout>
#if QT_CONFIG(clipboard)
# include <QGuiApplication>
# include <QClipboard>
#endif
#include <QTextStream>
// Helpers for formatting character sequences
// Format a special character like '\x0a'
template <class Int>
static void formatEscapedNumber(QTextStream &str, Int value, int base,
int width = 0,char prefix = 0)
{
str << '\\';
if (prefix)
str << prefix;
const auto oldPadChar = str.padChar();
const auto oldFieldWidth = str.fieldWidth();
const auto oldFieldAlignment = str.fieldAlignment();
const auto oldIntegerBase = str.integerBase();
str.setPadChar(QLatin1Char('0'));
str.setFieldWidth(width);
str.setFieldAlignment(QTextStream::AlignRight);
str.setIntegerBase(base);
str << value;
str.setIntegerBase(oldIntegerBase);
str.setFieldAlignment(oldFieldAlignment);
str.setFieldWidth(oldFieldWidth);
str.setPadChar(oldPadChar);
}
template <class Int>
static bool formatSpecialCharacter(QTextStream &str, Int value)
{
bool result = true;
switch (value) {
case '\\':
str << "\\\\";
break;
case '\"':
str << "\\\"";
break;
case '\n':
str << "\\n";
break;
default:
result = false;
break;
}
return result;
}
// Format a sequence of characters (QChar, ushort (UTF-16), uint (UTF-32)
// or just char (Latin1, Utf-8)) with the help of traits specifying
// how to obtain the code for checking the printable-ness and how to
// stream out the plain ASCII values.
template <EncodingDialog::Encoding>
struct FormattingTraits
{
};
template <>
struct FormattingTraits<EncodingDialog::Unicode>
{
static ushort code(QChar c) { return c.unicode(); }
static char toAscii(QChar c) { return c.toLatin1(); }
};
template <>
struct FormattingTraits<EncodingDialog::Utf8>
{
static ushort code(char c) { return uchar(c); }
static char toAscii(char c) { return c; }
};
template <>
struct FormattingTraits<EncodingDialog::Utf16>
{
static ushort code(ushort c) { return c; }
static char toAscii(ushort c) { return char(c); }
};
template <>
struct FormattingTraits<EncodingDialog::Utf32>
{
static uint code(uint c) { return c; }
static char toAscii(uint c) { return char(c); }
};
template <>
struct FormattingTraits<EncodingDialog::Latin1>
{
static uchar code(char c) { return uchar(c); }
static char toAscii(char c) { return c; }
};
static bool isHexDigit(char c)
{
return (c >= '0' && c <= '9') || (c >= 'a' && c <= 'f')
|| (c >= 'A' && c <= 'F');
}
template <EncodingDialog::Encoding encoding, class Iterator>
static void formatStringSequence(QTextStream &str, Iterator i1, Iterator i2,
int escapeIntegerBase, int escapeWidth,
char escapePrefix = 0)
{
str << '"';
bool separateHexEscape = false;
for (; i1 != i2; ++i1) {
const auto code = FormattingTraits<encoding>::code(*i1);
if (code >= 0x80) {
formatEscapedNumber(str, code, escapeIntegerBase, escapeWidth, escapePrefix);
separateHexEscape = escapeIntegerBase == 16 && escapeWidth == 0;
} else {
if (!formatSpecialCharacter(str, code)) {
const char c = FormattingTraits<encoding>::toAscii(*i1);
// For variable width/hex: Terminate the literal to stop digit parsing
// ("\x12" "34...").
if (separateHexEscape && isHexDigit(c))
str << "\" \"";
str << c;
}
separateHexEscape = false;
}
}
str << '"';
}
static QString encodedString(const QString &value, EncodingDialog::Encoding e)
{
QString result;
QTextStream str(&result);
switch (e) {
case EncodingDialog::Unicode:
formatStringSequence<EncodingDialog::Unicode>(str, value.cbegin(), value.cend(),
16, 4, 'u');
break;
case EncodingDialog::Utf8: {
const QByteArray utf8 = value.toUtf8();
str << "u8";
formatStringSequence<EncodingDialog::Utf8>(str, utf8.cbegin(), utf8.cend(),
8, 3);
}
break;
case EncodingDialog::Utf16: {
auto utf16 = value.utf16();
auto utf16End = utf16 + value.size();
str << 'u';
formatStringSequence<EncodingDialog::Utf16>(str, utf16, utf16End,
16, 0, 'x');
}
break;
case EncodingDialog::Utf32: {
auto utf32 = value.toUcs4();
str << 'U';
formatStringSequence<EncodingDialog::Utf32>(str, utf32.cbegin(), utf32.cend(),
16, 0, 'x');
}
break;
case EncodingDialog::Latin1: {
const QByteArray latin1 = value.toLatin1();
formatStringSequence<EncodingDialog::Latin1>(str, latin1.cbegin(), latin1.cend(),
16, 0, 'x');
}
break;
case EncodingDialog::EncodingCount:
break;
}
return result;
}
// Dialog helpers
static const char *encodingLabels[]
{
QT_TRANSLATE_NOOP("EncodingDialog", "Unicode:"),
QT_TRANSLATE_NOOP("EncodingDialog", "UTF-8:"),
QT_TRANSLATE_NOOP("EncodingDialog", "UTF-16:"),
QT_TRANSLATE_NOOP("EncodingDialog", "UTF-32:"),
QT_TRANSLATE_NOOP("EncodingDialog", "Latin1:")
};
static const char *encodingToolTips[]
{
QT_TRANSLATE_NOOP("EncodingDialog", "Unicode points for use with any encoding (C++, Python)"),
QT_TRANSLATE_NOOP("EncodingDialog", "QString::fromUtf8()"),
QT_TRANSLATE_NOOP("EncodingDialog", "wchar_t on Windows, char16_t everywhere"),
QT_TRANSLATE_NOOP("EncodingDialog", "wchar_t on Unix (Ucs4)"),
QT_TRANSLATE_NOOP("EncodingDialog", "QLatin1String")
};
// A read-only line edit with a tool button to copy the contents
class DisplayLineEdit : public QLineEdit
{
Q_OBJECT
public:
explicit DisplayLineEdit(const QIcon &icon, QWidget *parent = nullptr);
public slots:
void copyAll();
};
DisplayLineEdit::DisplayLineEdit(const QIcon &icon, QWidget *parent) :
QLineEdit(parent)
{
setReadOnly(true);
#if QT_CONFIG(clipboard) && QT_CONFIG(action)
auto copyAction = addAction(icon, QLineEdit::TrailingPosition);
connect(copyAction, &QAction::triggered, this, &DisplayLineEdit::copyAll);
#endif
}
void DisplayLineEdit::copyAll()
{
#if QT_CONFIG(clipboard)
QGuiApplication::clipboard()->setText(text());
#endif
}
static void addFormLayoutRow(QFormLayout *formLayout, const QString &text,
QWidget *w, const QString &toolTip)
{
auto label = new QLabel(text);
label->setToolTip(toolTip);
w->setToolTip(toolTip);
label->setBuddy(w);
formLayout->addRow(label, w);
}
EncodingDialog::EncodingDialog(QWidget *parent) :
QDialog(parent)
{
setWindowFlags(windowFlags() & ~Qt::WindowContextHelpButtonHint);
setWindowTitle(tr("Encodings"));
auto formLayout = new QFormLayout;
auto sourceLineEdit = new QLineEdit(this);
sourceLineEdit->setClearButtonEnabled(true);
connect(sourceLineEdit, &QLineEdit::textChanged, this, &EncodingDialog::textChanged);
addFormLayoutRow(formLayout, tr("&Source:"), sourceLineEdit, tr("Enter text"));
const auto copyIcon = QIcon::fromTheme(QLatin1String("edit-copy"),
QIcon(QLatin1String(":/images/editcopy")));
for (int i = 0; i < EncodingCount; ++i) {
m_lineEdits[i] = new DisplayLineEdit(copyIcon, this);
addFormLayoutRow(formLayout, tr(encodingLabels[i]),
m_lineEdits[i], tr(encodingToolTips[i]));
}
auto mainLayout = new QVBoxLayout(this);
mainLayout->addLayout(formLayout);
auto buttonBox = new QDialogButtonBox(QDialogButtonBox::Close);
connect(buttonBox, &QDialogButtonBox::rejected, this, &QDialog::reject);
mainLayout->addWidget(buttonBox);
}
void EncodingDialog::textChanged(const QString &t)
{
if (t.isEmpty()) {
for (auto lineEdit : m_lineEdits)
lineEdit->clear();
} else {
for (int i = 0; i < EncodingCount; ++i)
m_lineEdits[i]->setText(encodedString(t, static_cast<Encoding>(i)));
}
}
#include "encodingdialog.moc"
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