Java tutorial
/** * This file Copyright (c) 2005-2008 Aptana, Inc. This program is * dual-licensed under both the Aptana Public License and the GNU General * Public license. You may elect to use one or the other of these licenses. * * This program is distributed in the hope that it will be useful, but * AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or * NONINFRINGEMENT. Redistribution, except as permitted by whichever of * the GPL or APL you select, is prohibited. * * 1. For the GPL license (GPL), you can redistribute and/or modify this * program under the terms of the GNU General Public License, * Version 3, as published by the Free Software Foundation. You should * have received a copy of the GNU General Public License, Version 3 along * with this program; if not, write to the Free Software Foundation, Inc., 51 * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Aptana provides a special exception to allow redistribution of this file * with certain other free and open source software ("FOSS") code and certain additional terms * pursuant to Section 7 of the GPL. You may view the exception and these * terms on the web at http://www.aptana.com/legal/gpl/. * * 2. For the Aptana Public License (APL), this program and the * accompanying materials are made available under the terms of the APL * v1.0 which accompanies this distribution, and is available at * http://www.aptana.com/legal/apl/. * * You may view the GPL, Aptana's exception and additional terms, and the * APL in the file titled license.html at the root of the corresponding * plugin containing this source file. * * Any modifications to this file must keep this entire header intact. */ package com.aptana.ide.editor.js.contentassist; import org.eclipse.jface.resource.ColorRegistry; import org.eclipse.jface.resource.JFaceResources; import org.eclipse.jface.text.ITextViewer; import org.eclipse.jface.text.TextPresentation; import org.eclipse.jface.text.contentassist.IContextInformation; import org.eclipse.jface.text.contentassist.IContextInformationPresenter; import org.eclipse.jface.text.contentassist.IContextInformationValidator; import org.eclipse.swt.SWT; import org.eclipse.swt.custom.StyleRange; import org.eclipse.swt.graphics.Color; import org.eclipse.swt.graphics.RGB; import com.aptana.ide.core.IdeLog; import com.aptana.ide.editor.js.JSOffsetMapper; import com.aptana.ide.editor.scriptdoc.ScriptDocHelper; import com.aptana.ide.editors.UnifiedEditorsPlugin; /** * */ public class JSContextInformationValidator implements IContextInformationValidator, IContextInformationPresenter { /** The code assist processor. */ private JSContentAssistProcessor fProcessor; /** The context information to be validated. */ private IContextInformation fContextInformation; /** Validates the info window, can add styling. * @param processor */ public JSContextInformationValidator(JSContentAssistProcessor processor) { fProcessor = processor; } /** * @see org.eclipse.jface.text.contentassist.IContextInformationValidator#install(org.eclipse.jface.text.contentassist.IContextInformation, org.eclipse.jface.text.ITextViewer, int) */ public void install(IContextInformation contextInformation, ITextViewer viewer, int offset) { fContextInformation = contextInformation; } /** * @see org.eclipse.jface.text.contentassist.IContextInformationValidator#isContextInformationValid(int) */ public boolean isContextInformationValid(int offset) { if (fProcessor.initalPopup) { fProcessor.initalPopup = false; return true; } return (fProcessor.getJSOffsetMapper().getMode(offset).equalsIgnoreCase(JSOffsetMapper.MODE_INVOKING)); } /** * @see org.eclipse.jface.text.contentassist.IContextInformationPresenter#updatePresentation(int, org.eclipse.jface.text.TextPresentation) */ public boolean updatePresentation(int offset, TextPresentation presentation) { try { String s = this.fContextInformation.getInformationDisplayString(); int arg = fProcessor.getJSOffsetMapper().getArgIndexAndCalculateMode(); if (s.indexOf("(") == -1) //$NON-NLS-1$ { return false; } presentation.clear(); String[] lines = s.split(ScriptDocHelper.DEFAULT_DELIMITER); s = lines[0]; // only look at first line // If open/close parens, then no params if (s.indexOf("()") > 0) //$NON-NLS-1$ { return false; } // arg text always starts with brace int count = 0; int startPos = s.indexOf("("); //$NON-NLS-1$ int endPos = s.indexOf(","); //$NON-NLS-1$ // Single parameter case if (endPos == -1) { endPos = s.indexOf(")"); // arg text always ends with ")" //$NON-NLS-1$ } RGB blackColor = new RGB(0, 0, 0); ColorRegistry cm = JFaceResources.getColorRegistry(); cm.put("black", blackColor); //$NON-NLS-1$ Color norm = cm.get("black"); // make this settable //$NON-NLS-1$ StyleRange st = new StyleRange(0, startPos, norm, null, SWT.BOLD); presentation.addStyleRange(st); while (count < arg) { startPos = endPos; endPos = s.indexOf(",", startPos + 1); //$NON-NLS-1$ if (endPos == -1) { endPos = s.indexOf(")", startPos); //$NON-NLS-1$ } if (endPos == -1) { break; } count++; } // + 1 accounts for the leading "(" startPos += 1; st = new StyleRange(startPos, endPos - startPos, norm, null, SWT.BOLD); presentation.addStyleRange(st); int delimiterLength = ScriptDocHelper.DEFAULT_DELIMITER.length(); // bold the arg comment names if (lines.length > 1) { int totalLen = lines[0].length() + delimiterLength; // 1 crlf for (int i = 1; i < lines.length; i++) { String line = lines[i]; StyleRange argNameStyle = null; if (arg + 1 == i) { argNameStyle = new StyleRange(totalLen, line.length(), norm, null, SWT.BOLD); } else { argNameStyle = new StyleRange(totalLen, line.indexOf(":"), norm, null, SWT.NORMAL); //$NON-NLS-1$ } presentation.addStyleRange(argNameStyle); totalLen += line.length() + delimiterLength; // 1 crlf } } return true; } catch (Exception e) { IdeLog.logError(UnifiedEditorsPlugin.getDefault(), Messages.JSContextInformationValidator_ErrorUpdatingCOntext, e); return true; } } }