| /* |
| * Copyright 2000-2014 JetBrains s.r.o. |
| * |
| * 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 at |
| * |
| * 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 com.intellij.lexer; |
| |
| import com.intellij.psi.tree.IElementType; |
| import org.jetbrains.annotations.NotNull; |
| |
| /** |
| * Naive implementation of lexer that able to combine element types of two other lexers. |
| * |
| * The implementation doesn't give any guarantees about valid points of 'incremental relexing', |
| * because it returns start/end-offsets not for token that was used but for the shortest one. |
| * |
| * Also it reduces state size to 16 bits for nested lexer. |
| * |
| * @deprecated use {@link com.intellij.psi.templateLanguages.TemplateBlackAndWhiteLexer} or {@link com.intellij.lexer.LayeredLexer} instead |
| */ |
| public abstract class CompositeLexer extends LexerBase { |
| private final Lexer myLexer1; |
| private final Lexer myLexer2; |
| private int myCurOffset; |
| |
| public CompositeLexer(Lexer lexer1, Lexer lexer2) { |
| myLexer1 = lexer1; |
| myLexer2 = lexer2; |
| } |
| |
| protected abstract IElementType getCompositeTokenType(IElementType type1, IElementType type2); |
| |
| @Override |
| public void start(@NotNull CharSequence buffer, int startOffset, int endOffset, int initialState) { |
| myLexer1.start(buffer, startOffset, endOffset, (initialState >> 16) & 0xFFFF); |
| myLexer2.start(buffer, startOffset, endOffset, initialState & 0xFFFF); |
| myCurOffset = startOffset; |
| } |
| |
| @NotNull |
| @Override |
| public CharSequence getBufferSequence() { |
| return myLexer1.getBufferSequence(); |
| } |
| |
| @Override |
| public int getState() { |
| final int state = myLexer1.getState(); |
| final int state2 = myLexer2.getState(); |
| |
| if (state >= 0 && state < Short.MAX_VALUE && |
| state2 >= 0 && state2 < Short.MAX_VALUE) { |
| return (state << 16) + state2; |
| } |
| |
| return 0; |
| } |
| |
| @Override |
| public IElementType getTokenType() { |
| IElementType type1 = myLexer1.getTokenType(); |
| if (type1 == null) return null; |
| IElementType type2 = myLexer2.getTokenType(); |
| return getCompositeTokenType(type1, type2); |
| } |
| |
| @Override |
| public int getTokenStart() { |
| return myCurOffset; |
| } |
| |
| @Override |
| public int getTokenEnd() { |
| return Math.min(myLexer1.getTokenEnd(), myLexer2.getTokenEnd()); |
| } |
| |
| @Override |
| public void advance() { |
| int end1 = myLexer1.getTokenEnd(); |
| int end2 = myLexer2.getTokenEnd(); |
| myCurOffset = Math.min(end1, end2); |
| if (myCurOffset == end1){ |
| myLexer1.advance(); |
| } |
| if (myCurOffset == end2){ |
| myLexer2.advance(); |
| } |
| } |
| |
| @Override |
| public int getBufferEnd() { |
| return myLexer1.getBufferEnd(); |
| } |
| |
| } |