Qt 5.6 | Qt Widgets | QRegularExpression Example | regularexpressiondialog.cpp Example File

Qt 5.6.3 Reference Documentation

# regularexpressiondialog.cpp Example File

tools/regularexpression/regularexpressiondialog.cpp

      /****************************************************************************
      **
      ** Copyright (C) 2015 Klarälvdalens Datakonsult AB, a KDAB Group company, info@kdab.com, author Giuseppe D'Angelo <giuseppe.dangelo@kdab.com>
      ** Copyright (C) 2015 Samuel Gaist <samuel.gaist@edeltech.ch>
      ** Copyright (C) 2015 The Qt Company Ltd.
      ** Contact: http://www.qt.io/licensing/
      **
      ** This file is part of the examples of the Qt Toolkit.
      **
      ** $QT_BEGIN_LICENSE:BSD$
      ** 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
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      **     the documentation and/or other materials provided with the
      **     distribution.
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      **     from this software without specific prior written permission.
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      #include "regularexpressiondialog.h"

      #include <QApplication>

      #include <QCheckBox>
      #include <QComboBox>
      #include <QLabel>
      #include <QLineEdit>
      #include <QSpinBox>
      #include <QPlainTextEdit>
      #include <QTreeWidget>

      #include <QAction>
      #include <QClipboard>

      #include <QHBoxLayout>
      #include <QGridLayout>
      #include <QFormLayout>

      #include <QRegularExpression>
      #include <QRegularExpressionMatch>
      #include <QRegularExpressionMatchIterator>

      Q_DECLARE_METATYPE(QRegularExpression::MatchType)

      RegularExpressionDialog::RegularExpressionDialog(QWidget *parent)
          : QDialog(parent)
      {
          setupUi();
          setWindowTitle(tr("QRegularExpression Example"));

          connect(patternLineEdit, &QLineEdit::textChanged, this, &RegularExpressionDialog::refresh);
          connect(subjectTextEdit, &QPlainTextEdit::textChanged, this, &RegularExpressionDialog::refresh);

          connect(caseInsensitiveOptionCheckBox, &QCheckBox::toggled, this, &RegularExpressionDialog::refresh);
          connect(dotMatchesEverythingOptionCheckBox, &QCheckBox::toggled, this, &RegularExpressionDialog::refresh);
          connect(multilineOptionCheckBox, &QCheckBox::toggled, this, &RegularExpressionDialog::refresh);
          connect(extendedPatternSyntaxOptionCheckBox, &QCheckBox::toggled, this, &RegularExpressionDialog::refresh);
          connect(invertedGreedinessOptionCheckBox, &QCheckBox::toggled, this, &RegularExpressionDialog::refresh);
          connect(dontCaptureOptionCheckBox, &QCheckBox::toggled, this, &RegularExpressionDialog::refresh);
          connect(useUnicodePropertiesOptionCheckBox, &QCheckBox::toggled, this, &RegularExpressionDialog::refresh);
          connect(optimizeOnFirstUsageOptionCheckBox, &QCheckBox::toggled, this, &RegularExpressionDialog::refresh);
          connect(dontAutomaticallyOptimizeOptionCheckBox, &QCheckBox::toggled, this, &RegularExpressionDialog::refresh);

          connect(offsetSpinBox, static_cast<void (QSpinBox::*)(int)>(&QSpinBox::valueChanged),
                  this, &RegularExpressionDialog::refresh);

          connect(matchTypeComboBox, static_cast<void (QComboBox::*)(int)>(&QComboBox::currentIndexChanged),
                  this, &RegularExpressionDialog::refresh);

          connect(anchoredMatchOptionCheckBox, &QCheckBox::toggled, this, &RegularExpressionDialog::refresh);
          connect(dontCheckSubjectStringMatchOptionCheckBox, &QCheckBox::toggled, this, &RegularExpressionDialog::refresh);

          patternLineEdit->setText(tr("(\\+?\\d+)-(?<prefix>\\d+)-(?<number>\\w+)"));
          subjectTextEdit->setPlainText(tr("My office number is +43-152-0123456, my mobile is 001-41-255512 instead."));

          refresh();
      }

      void RegularExpressionDialog::refresh()
      {
          setUpdatesEnabled(false);

          const QString pattern = patternLineEdit->text();
          const QString text = subjectTextEdit->toPlainText();

          offsetSpinBox->setMaximum(qMax(0, text.length() - 1));

          QString escaped = pattern;
          escaped.replace(QLatin1String("\\"), QLatin1String("\\\\"));
          escaped.replace(QLatin1String("\""), QLatin1String("\\\""));
          escaped.prepend(QLatin1Char('"'));
          escaped.append(QLatin1Char('"'));
          escapedPatternLineEdit->setText(escaped);

          QRegularExpression rx(pattern);
          QRegularExpression::MatchType matchType = matchTypeComboBox->currentData().value<QRegularExpression::MatchType>();
          QRegularExpression::PatternOptions patternOptions = QRegularExpression::NoPatternOption;
          QRegularExpression::MatchOptions matchOptions = QRegularExpression::NoMatchOption;

          if (anchoredMatchOptionCheckBox->isChecked())
              matchOptions |= QRegularExpression::AnchoredMatchOption;
          if (dontCheckSubjectStringMatchOptionCheckBox->isChecked())
              matchOptions |= QRegularExpression::DontCheckSubjectStringMatchOption;

          if (caseInsensitiveOptionCheckBox->isChecked())
              patternOptions |= QRegularExpression::CaseInsensitiveOption;
          if (dotMatchesEverythingOptionCheckBox->isChecked())
              patternOptions |= QRegularExpression::DotMatchesEverythingOption;
          if (multilineOptionCheckBox->isChecked())
              patternOptions |= QRegularExpression::MultilineOption;
          if (extendedPatternSyntaxOptionCheckBox->isChecked())
              patternOptions |= QRegularExpression::ExtendedPatternSyntaxOption;
          if (invertedGreedinessOptionCheckBox->isChecked())
              patternOptions |= QRegularExpression::InvertedGreedinessOption;
          if (dontCaptureOptionCheckBox->isChecked())
              patternOptions |= QRegularExpression::DontCaptureOption;
          if (useUnicodePropertiesOptionCheckBox->isChecked())
              patternOptions |= QRegularExpression::UseUnicodePropertiesOption;
          if (optimizeOnFirstUsageOptionCheckBox->isChecked())
              patternOptions |= QRegularExpression::OptimizeOnFirstUsageOption;
          if (dontAutomaticallyOptimizeOptionCheckBox->isChecked())
              patternOptions |= QRegularExpression::DontAutomaticallyOptimizeOption;

          rx.setPatternOptions(patternOptions);

          QPalette palette = patternLineEdit->palette();
          if (rx.isValid())
              palette.setColor(QPalette::Text, subjectTextEdit->palette().color(QPalette::Text));
          else
              palette.setColor(QPalette::Text, Qt::red);
          patternLineEdit->setPalette(palette);

          matchDetailsTreeWidget->clear();
          matchDetailsTreeWidget->setEnabled(rx.isValid());

          if (rx.isValid()) {
              const int capturingGroupsCount = rx.captureCount() + 1;

              QRegularExpressionMatchIterator iterator = rx.globalMatch(text, offsetSpinBox->value(), matchType, matchOptions);
              int i = 0;

              while (iterator.hasNext()) {
                  QRegularExpressionMatch match = iterator.next();

                  QTreeWidgetItem *matchDetailTopItem = new QTreeWidgetItem(matchDetailsTreeWidget);
                  matchDetailTopItem->setText(0, QString::number(i));

                  for (int captureGroupIndex = 0; captureGroupIndex < capturingGroupsCount; ++captureGroupIndex) {
                      QTreeWidgetItem *matchDetailItem = new QTreeWidgetItem(matchDetailTopItem);
                      matchDetailItem->setText(1, QString::number(captureGroupIndex));
                      matchDetailItem->setText(2, match.captured(captureGroupIndex));
                  }

                  ++i;
              }
          }

          matchDetailsTreeWidget->expandAll();

          namedGroupsTreeWidget->clear();
          namedGroupsTreeWidget->setEnabled(rx.isValid());

          if (rx.isValid()) {
              regexpStatusLabel->setText(tr("Valid"));

              const QStringList namedCaptureGroups = rx.namedCaptureGroups();
              for (int i = 0; i < namedCaptureGroups.size(); ++i) {
                  const QString currentNamedCaptureGroup = namedCaptureGroups.at(i);

                  QTreeWidgetItem *namedGroupItem = new QTreeWidgetItem(namedGroupsTreeWidget);
                  namedGroupItem->setText(0, QString::number(i));
                  namedGroupItem->setText(1, currentNamedCaptureGroup.isNull() ? tr("<no name>") : currentNamedCaptureGroup);
              }
          } else {
              regexpStatusLabel->setText(tr("Invalid: syntax error at position %1 (%2)")
                                         .arg(rx.patternErrorOffset())
                                         .arg(rx.errorString()));
          }

          setUpdatesEnabled(true);
      }

      void RegularExpressionDialog::copyEscapedPatternToClipboard()
      {
      #ifndef QT_NO_CLIPBOARD
          QClipboard *clipboard = QGuiApplication::clipboard();
          if (clipboard)
              clipboard->setText(escapedPatternLineEdit->text());
      #endif
      }

      void RegularExpressionDialog::setupUi()
      {
          QWidget *leftHalfContainer = setupLeftUi();

          QFrame *verticalSeparator = new QFrame;
          verticalSeparator->setFrameStyle(QFrame::VLine | QFrame::Sunken);

          QWidget *rightHalfContainer = setupRightUi();

          QHBoxLayout *mainLayout = new QHBoxLayout;
          mainLayout->addWidget(leftHalfContainer);
          mainLayout->addWidget(verticalSeparator);
          mainLayout->addWidget(rightHalfContainer);

          setLayout(mainLayout);
      }

      QWidget *RegularExpressionDialog::setupLeftUi()
      {
          QWidget *container = new QWidget;

          QFormLayout *layout = new QFormLayout(container);
          layout->setFieldGrowthPolicy(QFormLayout::AllNonFixedFieldsGrow);
          layout->setMargin(0);

          QLabel *regexpAndSubjectLabel = new QLabel(tr("<h3>Regular expression and text input</h3>"));
          layout->addRow(regexpAndSubjectLabel);

          patternLineEdit = new QLineEdit;
          patternLineEdit->setClearButtonEnabled(true);
          layout->addRow(tr("&Pattern:"), patternLineEdit);

          escapedPatternLineEdit = new QLineEdit;
          escapedPatternLineEdit->setReadOnly(true);
          QPalette palette = escapedPatternLineEdit->palette();
          palette.setBrush(QPalette::Base, palette.brush(QPalette::Disabled, QPalette::Base));
          escapedPatternLineEdit->setPalette(palette);

      #ifndef QT_NO_CLIPBOARD
          QAction *copyEscapedPatternAction = new QAction(this);
          copyEscapedPatternAction->setText(tr("Copy to clipboard"));
          copyEscapedPatternAction->setIcon(QIcon(QStringLiteral(":/images/copy.png")));
          connect(copyEscapedPatternAction, &QAction::triggered, this, &RegularExpressionDialog::copyEscapedPatternToClipboard);
          escapedPatternLineEdit->addAction(copyEscapedPatternAction, QLineEdit::TrailingPosition);
      #endif

          layout->addRow(tr("&Escaped pattern:"), escapedPatternLineEdit);

          subjectTextEdit = new QPlainTextEdit;
          layout->addRow(tr("&Subject text:"), subjectTextEdit);

          caseInsensitiveOptionCheckBox = new QCheckBox(tr("Case insensitive (/i)"));
          dotMatchesEverythingOptionCheckBox = new QCheckBox(tr("Dot matches everything (/s)"));
          multilineOptionCheckBox = new QCheckBox(tr("Multiline (/m)"));
          extendedPatternSyntaxOptionCheckBox = new QCheckBox(tr("Extended pattern (/x)"));
          invertedGreedinessOptionCheckBox = new QCheckBox(tr("Inverted greediness"));
          dontCaptureOptionCheckBox = new QCheckBox(tr("Don't capture"));
          useUnicodePropertiesOptionCheckBox = new QCheckBox(tr("Use unicode properties (/u)"));
          optimizeOnFirstUsageOptionCheckBox = new QCheckBox(tr("Optimize on first usage"));
          dontAutomaticallyOptimizeOptionCheckBox = new QCheckBox(tr("Don't automatically optimize"));

          QGridLayout *patternOptionsCheckBoxLayout = new QGridLayout;
          int gridRow = 0;
          patternOptionsCheckBoxLayout->addWidget(caseInsensitiveOptionCheckBox, gridRow, 1);
          patternOptionsCheckBoxLayout->addWidget(dotMatchesEverythingOptionCheckBox, gridRow, 2);
          ++gridRow;
          patternOptionsCheckBoxLayout->addWidget(multilineOptionCheckBox, gridRow, 1);
          patternOptionsCheckBoxLayout->addWidget(extendedPatternSyntaxOptionCheckBox, gridRow, 2);
          ++gridRow;
          patternOptionsCheckBoxLayout->addWidget(invertedGreedinessOptionCheckBox, gridRow, 1);
          patternOptionsCheckBoxLayout->addWidget(dontCaptureOptionCheckBox, gridRow, 2);
          ++gridRow;
          patternOptionsCheckBoxLayout->addWidget(useUnicodePropertiesOptionCheckBox, gridRow, 1);
          patternOptionsCheckBoxLayout->addWidget(optimizeOnFirstUsageOptionCheckBox, gridRow, 2);
          ++gridRow;
          patternOptionsCheckBoxLayout->addWidget(dontAutomaticallyOptimizeOptionCheckBox, gridRow, 1);

          layout->addRow(tr("Pattern options:"), patternOptionsCheckBoxLayout);

          offsetSpinBox = new QSpinBox;
          layout->addRow(tr("Match &offset:"), offsetSpinBox);

          matchTypeComboBox = new QComboBox;
          matchTypeComboBox->addItem(tr("Normal"), QVariant::fromValue(QRegularExpression::NormalMatch));
          matchTypeComboBox->addItem(tr("Partial prefer complete"), QVariant::fromValue(QRegularExpression::PartialPreferCompleteMatch));
          matchTypeComboBox->addItem(tr("Partial prefer first"), QVariant::fromValue(QRegularExpression::PartialPreferFirstMatch));
          matchTypeComboBox->addItem(tr("No match"), QVariant::fromValue(QRegularExpression::NoMatch));
          layout->addRow(tr("Match &type:"), matchTypeComboBox);

          dontCheckSubjectStringMatchOptionCheckBox = new QCheckBox(tr("Don't check subject string"));
          anchoredMatchOptionCheckBox = new QCheckBox(tr("Anchored match"));

          QGridLayout *matchOptionsCheckBoxLayout = new QGridLayout;
          matchOptionsCheckBoxLayout->addWidget(dontCheckSubjectStringMatchOptionCheckBox, 0, 0);
          matchOptionsCheckBoxLayout->addWidget(anchoredMatchOptionCheckBox, 0, 1);
          layout->addRow(tr("Match options:"), matchOptionsCheckBoxLayout);

          return container;
      }

      QWidget *RegularExpressionDialog::setupRightUi()
      {
          QWidget *container = new QWidget;

          QFormLayout *layout = new QFormLayout(container);
          layout->setFieldGrowthPolicy(QFormLayout::AllNonFixedFieldsGrow);
          layout->setMargin(0);

          QLabel *matchInfoLabel = new QLabel(tr("<h3>Match information</h3>"));
          layout->addRow(matchInfoLabel);

          matchDetailsTreeWidget = new QTreeWidget;
          matchDetailsTreeWidget->setHeaderLabels(QStringList() << tr("Match index") << tr("Group index") << tr("Captured string"));
          matchDetailsTreeWidget->setSizeAdjustPolicy(QTreeWidget::AdjustToContents);
          layout->addRow(tr("Match details:"), matchDetailsTreeWidget);

          QFrame *horizontalSeparator = new QFrame;
          horizontalSeparator->setFrameStyle(QFrame::HLine | QFrame::Sunken);
          layout->addRow(horizontalSeparator);

          QLabel *regexpInfoLabel = new QLabel(tr("<h3>Regular expression information</h3>"));
          layout->addRow(regexpInfoLabel);

          regexpStatusLabel = new QLabel(tr("Valid"));
          regexpStatusLabel->setWordWrap(true);
          layout->addRow(tr("Pattern status:"), regexpStatusLabel);

          namedGroupsTreeWidget = new QTreeWidget;
          namedGroupsTreeWidget->setHeaderLabels(QStringList() << tr("Index") << tr("Named group"));
          namedGroupsTreeWidget->setSizeAdjustPolicy(QTreeWidget::AdjustToContents);
          namedGroupsTreeWidget->setRootIsDecorated(false);
          layout->addRow(tr("Named groups:"), namedGroupsTreeWidget);

          return container;
      }