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      1 /*
      2  * Copyright 2014, Google Inc.
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions are
      7  * met:
      8  *
      9  *     * Redistributions of source code must retain the above copyright
     10  * notice, this list of conditions and the following disclaimer.
     11  *     * Redistributions in binary form must reproduce the above
     12  * copyright notice, this list of conditions and the following disclaimer
     13  * in the documentation and/or other materials provided with the
     14  * distribution.
     15  *     * Neither the name of Google Inc. nor the names of its
     16  * contributors may be used to endorse or promote products derived from
     17  * this software without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     20  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     21  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     22  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     23  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     24  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     25  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     26  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     27  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     28  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     29  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 package org.jf.smalidea;
     33 
     34 import com.intellij.lexer.LexerBase;
     35 import com.intellij.psi.TokenType;
     36 import com.intellij.psi.tree.IElementType;
     37 import org.antlr.runtime.CommonToken;
     38 import org.jetbrains.annotations.NotNull;
     39 import org.jf.smali.smaliFlexLexer;
     40 import org.jf.smali.smaliParser;
     41 import org.jf.util.BlankReader;
     42 
     43 public class SmaliLexer extends LexerBase {
     44     private final smaliFlexLexer lexer = new smaliFlexLexer(BlankReader.INSTANCE);
     45     private CommonToken token = null;
     46     private int state = 0;
     47     private int endOffset;
     48     private CharSequence text;
     49 
     50     public SmaliLexer() {
     51         super();
     52         lexer.setSuppressErrors(true);
     53     }
     54 
     55     @Override public void start(@NotNull CharSequence buffer, int startOffset, int endOffset, int initialState) {
     56         text = buffer;
     57         lexer.reset(buffer, startOffset, endOffset, initialState);
     58         this.endOffset = endOffset;
     59         this.token = null;
     60         this.state = 0;
     61     }
     62 
     63     @NotNull @Override public CharSequence getTokenSequence() {
     64         return getTokenText();
     65     }
     66 
     67     @NotNull @Override public String getTokenText() {
     68         ensureToken();
     69         return token.getText();
     70     }
     71 
     72     @Override
     73     public int getState() {
     74         ensureToken();
     75         return state;
     76     }
     77 
     78     @Override
     79     public IElementType getTokenType() {
     80         ensureToken();
     81         return mapTokenTypeToElementType(token.getType());
     82     }
     83 
     84     private IElementType mapTokenTypeToElementType(int tokenType) {
     85         if (tokenType == smaliParser.WHITE_SPACE) {
     86             return TokenType.WHITE_SPACE;
     87         }
     88         if (tokenType == smaliParser.INVALID_TOKEN) {
     89             return TokenType.BAD_CHARACTER;
     90         }
     91         if (tokenType == smaliParser.EOF) {
     92             return null;
     93         }
     94         return SmaliTokens.getElementType(tokenType);
     95     }
     96 
     97     @Override
     98     public int getTokenStart() {
     99         ensureToken();
    100         return token.getStartIndex();
    101     }
    102 
    103     @Override
    104     public int getTokenEnd() {
    105         ensureToken();
    106         return token.getStopIndex()+1;
    107     }
    108 
    109     @Override
    110     public void advance() {
    111         token = null;
    112         state = 0;
    113     }
    114 
    115     @NotNull @Override public CharSequence getBufferSequence() {
    116         return text;
    117     }
    118 
    119     @Override
    120     public int getBufferEnd() {
    121         return endOffset;
    122     }
    123 
    124     private void ensureToken() {
    125         if (token == null) {
    126             token = (CommonToken)lexer.nextToken();
    127             state = lexer.yystate();
    128         }
    129         assert token != null;
    130     }
    131 }
    132