| /* |
| * Copyright 2009-2012 by The Regents of the University of California |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * you may obtain a copy of the License from |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package edu.uci.ics.asterix.lexergenerator; |
| |
| import java.util.LinkedHashMap; |
| import java.util.regex.Matcher; |
| import java.util.regex.Pattern; |
| |
| public class Token { |
| private String userDescription; |
| private String name; |
| private LexerNode node; |
| |
| public Token(String str, LinkedHashMap<String, Token> tokens) throws Exception { |
| userDescription = str; |
| node = new LexerNode(); |
| parse(userDescription, tokens); |
| } |
| |
| public String getName() { |
| return name; |
| } |
| |
| public LexerNode getNode() { |
| return node; |
| } |
| |
| public String toString() { |
| return this.name + " => " + getNode().toString(); |
| } |
| |
| public void merge(Token newToken) throws Exception { |
| node.merge(newToken.getNode()); |
| } |
| |
| private void parse(String str, LinkedHashMap<String, Token> tokens) throws Exception { |
| Pattern p = Pattern.compile("^(@?\\w+)\\s*=\\s*(.+)"); |
| Matcher m = p.matcher(str); |
| if (!m.find()) |
| throw new Exception("Token definition not correct: " + str); |
| this.name = m.group(1).replaceAll("@", "aux_"); |
| String[] textRules = m.group(2).split("(?<!\\\\),\\s*"); |
| for (String textRule : textRules) { |
| Pattern pRule = Pattern.compile("^(\\w+)(\\((.*)\\))?"); |
| Matcher mRule = pRule.matcher(textRule); |
| mRule.find(); |
| String generator = mRule.group(1); |
| String constructor = mRule.group(3); |
| if (constructor == null) |
| throw new Exception("Error in rule format: " + "\n " + str + " = " + generator + " : " + constructor); |
| constructor = constructor.replace("\\", ""); |
| node.append(NodeChainFactory.create(generator, constructor)); |
| node.expandFirstAction(tokens); |
| } |
| node.appendTokenName(name); |
| } |
| |
| } |