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/*
* Copyright 2000-2009 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.lang.cacheBuilder;
import com.intellij.lexer.Lexer;
import com.intellij.psi.tree.IElementType;
import com.intellij.psi.tree.TokenSet;
import com.intellij.util.Processor;
import org.jetbrains.annotations.NotNull;
/**
* The default implementation of a words scanner based on a custom language lexer.
*
* @author max
*/
public class DefaultWordsScanner extends VersionedWordsScanner {
private final Lexer myLexer;
private final TokenSet myIdentifierTokenSet;
private final TokenSet myCommentTokenSet;
private final TokenSet myLiteralTokenSet;
private final TokenSet mySkipCodeContextTokenSet;
private boolean myMayHaveFileRefsInLiterals;
/**
* Creates a new instance of the words scanner.
*
* @param lexer the lexer used for breaking the text into tokens.
* @param identifierTokenSet the set of token types which represent identifiers.
* @param commentTokenSet the set of token types which represent comments.
* @param literalTokenSet the set of token types which represent literals.
*/
public DefaultWordsScanner(final Lexer lexer, final TokenSet identifierTokenSet, final TokenSet commentTokenSet,
final TokenSet literalTokenSet) {
this(lexer, identifierTokenSet, commentTokenSet, literalTokenSet, TokenSet.EMPTY);
}
/**
* Creates a new instance of the words scanner.
*
* @param lexer the lexer used for breaking the text into tokens.
* @param identifierTokenSet the set of token types which represent identifiers.
* @param commentTokenSet the set of token types which represent comments.
* @param literalTokenSet the set of token types which represent literals.
* @param skipCodeContextTokenSet the set of token types which should not be considered as code context.
*/
public DefaultWordsScanner(final Lexer lexer, final TokenSet identifierTokenSet, final TokenSet commentTokenSet,
final TokenSet literalTokenSet, @NotNull TokenSet skipCodeContextTokenSet) {
myLexer = lexer;
myIdentifierTokenSet = identifierTokenSet;
myCommentTokenSet = commentTokenSet;
myLiteralTokenSet = literalTokenSet;
mySkipCodeContextTokenSet = skipCodeContextTokenSet;
}
public void processWords(CharSequence fileText, Processor<WordOccurrence> processor) {
myLexer.start(fileText);
WordOccurrence occurrence = new WordOccurrence(fileText, 0, 0, null); // shared occurrence
IElementType type;
while ((type = myLexer.getTokenType()) != null) {
if (myIdentifierTokenSet.contains(type)) {
//occurrence.init(fileText, myLexer.getTokenStart(), myLexer.getTokenEnd(), WordOccurrence.Kind.CODE);
//if (!processor.process(occurrence)) return;
if (!stripWords(processor, fileText, myLexer.getTokenStart(), myLexer.getTokenEnd(), WordOccurrence.Kind.CODE, occurrence, false)) return; }
else if (myCommentTokenSet.contains(type)) {
if (!stripWords(processor, fileText,myLexer.getTokenStart(),myLexer.getTokenEnd(), WordOccurrence.Kind.COMMENTS,occurrence, false)) return;
}
else if (myLiteralTokenSet.contains(type)) {
if (!stripWords(processor, fileText, myLexer.getTokenStart(),myLexer.getTokenEnd(),WordOccurrence.Kind.LITERALS,occurrence, myMayHaveFileRefsInLiterals)) return;
}
else if (!mySkipCodeContextTokenSet.contains(type)) {
if (!stripWords(processor, fileText, myLexer.getTokenStart(), myLexer.getTokenEnd(), WordOccurrence.Kind.CODE, occurrence, false)) return;
}
myLexer.advance();
}
}
protected static boolean stripWords(final Processor<WordOccurrence> processor,
final CharSequence tokenText,
int from,
int to,
final WordOccurrence.Kind kind,
@NotNull WordOccurrence occurrence,
boolean mayHaveFileRefs
) {
// This code seems strange but it is more effective as Character.isJavaIdentifier_xxx_ is quite costly operation due to unicode
int index = from;
ScanWordsLoop:
while (true) {
while (true) {
if (index == to) break ScanWordsLoop;
char c = tokenText.charAt(index);
if (isAsciiIdentifierPart(c) || Character.isJavaIdentifierStart(c)) {
break;
}
index++;
}
int wordStart = index;
while (true) {
index++;
if (index == to) break;
char c = tokenText.charAt(index);
if (isAsciiIdentifierPart(c)) continue;
if (!Character.isJavaIdentifierPart(c)) break;
}
int wordEnd = index;
occurrence.init(tokenText, wordStart, wordEnd, kind);
if (!processor.process(occurrence)) return false;
if (mayHaveFileRefs) {
occurrence.init(tokenText, wordStart, wordEnd, WordOccurrence.Kind.FOREIGN_LANGUAGE);
if (!processor.process(occurrence)) return false;
}
}
return true;
}
private static boolean isAsciiIdentifierPart(char c) {
return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || (c >= '0' && c <= '9') || c == '$';
}
public void setMayHaveFileRefsInLiterals(final boolean mayHaveFileRefsInLiterals) {
myMayHaveFileRefsInLiterals = mayHaveFileRefsInLiterals;
}
}
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