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Changed the functionality of the regex search with control decorations
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81 changes: 81 additions & 0 deletions
81
bundles/org.eclipse.ui/src/org/eclipse/ui/internal/SearchDecoration.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,81 @@ | ||
| /******************************************************************************* | ||
| * Copyright (c) 2024 Vector Informatik GmbH and others. | ||
| * | ||
| * This program and the accompanying materials | ||
| * are made available under the terms of the Eclipse Public License 2.0 | ||
| * which accompanies this distribution, and is available at | ||
| * https://www.eclipse.org/legal/epl-2.0/ | ||
| * | ||
| * SPDX-License-Identifier: EPL-2.0 | ||
| * | ||
| * Contributors: | ||
| * Vector Informatik GmbH - initial API and implementation | ||
| *******************************************************************************/ | ||
|
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| package org.eclipse.ui.internal; | ||
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| import java.util.regex.Pattern; | ||
| import java.util.regex.PatternSyntaxException; | ||
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| import org.eclipse.jface.fieldassist.ControlDecoration; | ||
| import org.eclipse.jface.fieldassist.FieldDecorationRegistry; | ||
| import org.eclipse.swt.graphics.Image; | ||
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| /** | ||
| * This class contains methods to validate and decorate search fields. | ||
| */ | ||
| public class SearchDecoration { | ||
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| private SearchDecoration() { | ||
| // avoid instantiation | ||
| } | ||
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| /** | ||
| * Validate the given regular expression and change the control decoration | ||
| * accordingly. If the expression is invalid then the decoration will show an | ||
| * error icon and a message and if the expression is valid then the decoration | ||
| * will be hidden. | ||
| * | ||
| * @param regex The regular expression to be validated. | ||
| * @param targetDecoration The control decoration that will show the result of | ||
| * the validation. | ||
| */ | ||
| public static void validateRegex(String regex, ControlDecoration targetDecoration) { | ||
| String errorMessage = getValidationError(regex); | ||
| if (errorMessage.isEmpty()) { | ||
| targetDecoration.hide(); | ||
| return; | ||
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| } | ||
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| Image decorationImage = FieldDecorationRegistry.getDefault() | ||
| .getFieldDecoration(FieldDecorationRegistry.DEC_ERROR).getImage(); | ||
| targetDecoration.setImage(decorationImage); | ||
| targetDecoration.setDescriptionText(errorMessage); | ||
| targetDecoration.show(); | ||
| } | ||
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| /** | ||
| * Validate a regular expression. | ||
| * | ||
| * @return The appropriate error message if the regex is invalid or an empty | ||
| * string if the regex is valid. | ||
| */ | ||
| private static String getValidationError(String regex) { | ||
| try { | ||
| Pattern.compile(regex); | ||
| return ""; //$NON-NLS-1$ | ||
| } catch (PatternSyntaxException e) { | ||
| String message = e.getLocalizedMessage(); | ||
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| // Only preserve the first line of the original error message. | ||
| int i = 0; | ||
| while (i < message.length() && "\n\r".indexOf(message.charAt(i)) == -1) { //$NON-NLS-1$ | ||
| i++; | ||
| } | ||
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| return message.substring(0, i); | ||
| } | ||
| } | ||
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| } |