| /******************************************************************************* |
| * Copyright (c) 2006, 2012 Oracle Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * Oracle Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.bpel.ui.editors.xpath.rules; |
| |
| import org.eclipse.jface.text.rules.ICharacterScanner; |
| import org.eclipse.jface.text.rules.IRule; |
| import org.eclipse.jface.text.rules.IToken; |
| import org.eclipse.jface.text.rules.Token; |
| |
| /** |
| * Read and understand the floating point numbers and numbers in XPath. |
| * |
| * @author Michal Chmielewski (michal.chmielewski@oracle.com) |
| * @date Oct 26, 2006 |
| */ |
| |
| public class FloatRule implements IRule { |
| |
| IToken fToken; |
| |
| /** |
| * Return a brand new shiny FloatRule. |
| * |
| * @param token |
| */ |
| |
| public FloatRule(IToken token) { |
| fToken = token; |
| assert token != null; |
| } |
| |
| boolean isDigit(int c) { |
| return c >= 0x30 && c <= 0x39; // [0-9] |
| } |
| |
| /** |
| * |
| * @see org.eclipse.jface.text.rules.IRule#evaluate(org.eclipse.jface.text.rules.ICharacterScanner) |
| */ |
| |
| public IToken evaluate(ICharacterScanner scanner) { |
| int cnt = 0; |
| |
| int c = scanner.read(); |
| cnt += 1; |
| |
| if (isDigit(c)) { |
| do { |
| c = scanner.read(); |
| cnt += 1; |
| } while (isDigit(c)); |
| } |
| |
| scanner.unread(); |
| cnt -= 1; |
| |
| // either we start with . or continue with . |
| c = scanner.read(); |
| cnt += 1; |
| |
| if (c == '.') { |
| int cnt2 = cnt; |
| do { |
| c = scanner.read(); |
| cnt += 1; |
| } while (isDigit(c)); |
| scanner.unread(); |
| cnt -= 1; |
| |
| // we have not read any digits after the . |
| // so we reject this as a number |
| if (cnt == cnt2) { |
| // spit out the whole thing. |
| while (cnt > 0) { |
| scanner.unread(); |
| cnt -= 1; |
| } |
| return Token.UNDEFINED; |
| } |
| |
| // we have seen a number of the format |
| // [0-9]+.[0-9]+ or .[0-9]+ |
| return fToken; |
| } |
| |
| scanner.unread(); |
| cnt -= 1; |
| |
| return (cnt > 0 ? fToken : Token.UNDEFINED); |
| } |
| |
| } |