Qt 5.11 | Qt Widgets | Regular Expressions Example | regexpdialog.cpp Example File

Qt 5.11.3 Reference Documentation

# regexpdialog.cpp Example File

tools/regexp/regexpdialog.cpp

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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);
      }