1 /*
   2  * Copyright (c) 2008, 2013, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package com.sun.scenario.effect.compiler.lexer;
  27 
  28 import com.sun.scenario.effect.compiler.JSLLexer;
  29 import org.antlr.runtime.ANTLRStringStream;
  30 import org.antlr.runtime.Token;
  31 
  32 import static org.junit.Assert.*;
  33 
  34 public abstract class LexerBase {
  35 
  36     protected void assertRangeOfCharactersRecognized(char low, char high)
  37         throws Exception {
  38 
  39         for (char ch = low; ch <= high; ++ch) {
  40             assertRecognized(ch);
  41         }
  42     }
  43 
  44     protected void recognizeRange(char low, char high) throws Exception {
  45         for (char ch = low; ch <= high; ++ch) {
  46             recognize(ch);
  47         }
  48     }
  49 
  50     protected void assertRecognized(char ch) throws Exception {
  51         assertRecognized(String.valueOf(ch));
  52     }
  53 
  54     protected Token recognize(char ch) throws Exception {
  55         return recognize(String.valueOf(ch));
  56     }
  57 
  58     protected void assertRecognized(String text) throws Exception {
  59         Token token = recognize(text);
  60         assertEquals(text, token.getText());
  61 
  62         if (expectedTokenType() != Integer.MIN_VALUE) {
  63             assertEquals(expectedTokenType(), token.getType());
  64         }
  65     }
  66 
  67     protected Token recognize(String text) throws Exception {
  68         JSLLexer lexer = lexerOver(text);
  69         fireLexerRule(lexer);
  70         lexer = lexerOver(text);
  71         return lexer.nextToken();
  72     }
  73 
  74     private JSLLexer lexerOver(String text) {
  75         JSLLexer lexer = new JSLLexer();
  76         lexer.setCharStream(new ANTLRStringStream(text));
  77         return lexer;
  78     }
  79 
  80     protected abstract void fireLexerRule(JSLLexer lexer) throws Exception;
  81 
  82     protected int expectedTokenType() {
  83         return Integer.MIN_VALUE;
  84     }
  85 }