regexpdialog.cpp Example File

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  #include <QtWidgets>

  #include "regexpdialog.h"

  RegExpDialog::RegExpDialog(QWidget *parent)
      : QDialog(parent)
  {
      patternComboBox = new QComboBox;
      patternComboBox->setEditable(true);
      patternComboBox->setSizePolicy(QSizePolicy::Expanding,
                                     QSizePolicy::Preferred);

      patternLabel = new QLabel(tr("&Pattern:"));
      patternLabel->setBuddy(patternComboBox);

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

      escapedPatternLabel = new QLabel(tr("&Escaped Pattern:"));
      escapedPatternLabel->setBuddy(escapedPatternLineEdit);

      syntaxComboBox = new QComboBox;
      syntaxComboBox->addItem(tr("Regular expression v1"), QRegExp::RegExp);
      syntaxComboBox->addItem(tr("Regular expression v2"), QRegExp::RegExp2);
      syntaxComboBox->addItem(tr("Wildcard"), QRegExp::Wildcard);
      syntaxComboBox->addItem(tr("Fixed string"), QRegExp::FixedString);
      syntaxComboBox->addItem(tr("W3C Xml Schema 1.1"), QRegExp::W3CXmlSchema11);

      syntaxLabel = new QLabel(tr("&Pattern Syntax:"));
      syntaxLabel->setBuddy(syntaxComboBox);

      textComboBox = new QComboBox;
      textComboBox->setEditable(true);
      textComboBox->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Preferred);

      textLabel = new QLabel(tr("&Text:"));
      textLabel->setBuddy(textComboBox);

      caseSensitiveCheckBox = new QCheckBox(tr("Case &Sensitive"));
      caseSensitiveCheckBox->setChecked(true);
      minimalCheckBox = new QCheckBox(tr("&Minimal"));

      indexLabel = new QLabel(tr("Index of Match:"));
      indexEdit = new QLineEdit;
      indexEdit->setReadOnly(true);

      matchedLengthLabel = new QLabel(tr("Matched Length:"));
      matchedLengthEdit = new QLineEdit;
      matchedLengthEdit->setReadOnly(true);

      for (int i = 0; i < MaxCaptures; ++i) {
          captureLabels[i] = new QLabel(tr("Capture %1:").arg(i));
          captureEdits[i] = new QLineEdit;
          captureEdits[i]->setReadOnly(true);
      }
      captureLabels[0]->setText(tr("Match:"));

      QHBoxLayout *checkBoxLayout = new QHBoxLayout;
      checkBoxLayout->addWidget(caseSensitiveCheckBox);
      checkBoxLayout->addWidget(minimalCheckBox);
      checkBoxLayout->addStretch(1);

      QGridLayout *mainLayout = new QGridLayout;
      mainLayout->addWidget(patternLabel, 0, 0);
      mainLayout->addWidget(patternComboBox, 0, 1);
      mainLayout->addWidget(escapedPatternLabel, 1, 0);
      mainLayout->addWidget(escapedPatternLineEdit, 1, 1);
      mainLayout->addWidget(syntaxLabel, 2, 0);
      mainLayout->addWidget(syntaxComboBox, 2, 1);
      mainLayout->addLayout(checkBoxLayout, 3, 0, 1, 2);
      mainLayout->addWidget(textLabel, 4, 0);
      mainLayout->addWidget(textComboBox, 4, 1);
      mainLayout->addWidget(indexLabel, 5, 0);
      mainLayout->addWidget(indexEdit, 5, 1);
      mainLayout->addWidget(matchedLengthLabel, 6, 0);
      mainLayout->addWidget(matchedLengthEdit, 6, 1);

      for (int j = 0; j < MaxCaptures; ++j) {
          mainLayout->addWidget(captureLabels[j], 7 + j, 0);
          mainLayout->addWidget(captureEdits[j], 7 + j, 1);
      }
      setLayout(mainLayout);

      connect(patternComboBox, SIGNAL(editTextChanged(QString)),
              this, SLOT(refresh()));
      connect(textComboBox, SIGNAL(editTextChanged(QString)),
              this, SLOT(refresh()));
      connect(caseSensitiveCheckBox, SIGNAL(toggled(bool)),
              this, SLOT(refresh()));
      connect(minimalCheckBox, SIGNAL(toggled(bool)), this, SLOT(refresh()));
      connect(syntaxComboBox, SIGNAL(currentIndexChanged(int)),
              this, SLOT(refresh()));

      patternComboBox->addItem(tr("[A-Za-z_]+([A-Za-z_0-9]*)"));
      textComboBox->addItem(tr("(10 + delta4) * 32"));

      setWindowTitle(tr("RegExp"));
      setFixedHeight(sizeHint().height());
      refresh();
  }

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

      QString pattern = patternComboBox->currentText();
      QString text = textComboBox->currentText();

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

      QRegExp rx(pattern);
      Qt::CaseSensitivity cs = Qt::CaseInsensitive;
      if (caseSensitiveCheckBox->isChecked())
          cs = Qt::CaseSensitive;
      rx.setCaseSensitivity(cs);
      rx.setMinimal(minimalCheckBox->isChecked());
      QRegExp::PatternSyntax syntax = QRegExp::PatternSyntax(
              syntaxComboBox->itemData(syntaxComboBox->currentIndex()).toInt());
      rx.setPatternSyntax(syntax);

      QPalette palette = patternComboBox->palette();
      if (rx.isValid()) {
          palette.setColor(QPalette::Text,
                           textComboBox->palette().color(QPalette::Text));
      } else {
          palette.setColor(QPalette::Text, Qt::red);
      }
      patternComboBox->setPalette(palette);

      indexEdit->setText(QString::number(rx.indexIn(text)));
      matchedLengthEdit->setText(QString::number(rx.matchedLength()));
      for (int i = 0; i < MaxCaptures; ++i) {
          captureLabels[i]->setEnabled(i <= rx.captureCount());
          captureEdits[i]->setEnabled(i <= rx.captureCount());
          captureEdits[i]->setText(rx.cap(i));
      }

      setUpdatesEnabled(true);
  }