/*******************************************************************************
* Copyright (c) 2012-2017 Codenvy, S.A.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Codenvy, S.A. - initial API and implementation
*******************************************************************************/
package org.eclipse.che.ide.ext.java.client.editor;
import java.util.List;
import javax.inject.Inject;
import org.eclipse.che.ide.api.editor.text.rules.Token;
import org.eclipse.che.ide.api.editor.text.rules.TokenImpl;
import org.eclipse.che.ide.ext.java.jdt.JavaPartitions;
import org.eclipse.che.ide.api.editor.partition.PartitionScanner;
import org.eclipse.che.ide.api.editor.partition.StringCharacterScanner;
import org.eclipse.che.ide.ext.java.jdt.text.rules.CharacterScanner;
/**
* This scanner recognizes the JavaDoc comments, Java multi line comments, Java single line comments,
* Java strings and Java characters.
*/
public class JavaPartitionScanner implements PartitionScanner, JavaPartitions {
// states
private static final int JAVA = 0;
private static final int SINGLE_LINE_COMMENT = 1;
private static final int MULTI_LINE_COMMENT = 2;
private static final int JAVADOC = 3;
private static final int CHARACTER = 4;
private static final int STRING = 5;
// beginning of prefixes and postfixes
private static final int NONE = 0;
private static final int BACKSLASH = 1; // postfix for STRING and CHARACTER
private static final int SLASH = 2; // prefix for SINGLE_LINE or MULTI_LINE or JAVADOC
private static final int SLASH_STAR = 3; // prefix for MULTI_LINE_COMMENT or JAVADOC
private static final int SLASH_STAR_STAR = 4; // prefix for MULTI_LINE_COMMENT or JAVADOC
private static final int STAR = 5; // postfix for MULTI_LINE_COMMENT or JAVADOC
private static final int CARRIAGE_RETURN = 6; // postfix for STRING, CHARACTER and SINGLE_LINE_COMMENT
/** The content. */
private final StringCharacterScanner fScanner = new StringCharacterScanner();
/** The offset of the last returned token. */
private int fTokenOffset;
/** The length of the last returned token. */
private int fTokenLength;
/** The state of the scanner. */
private int fState;
/** The last significant characters read. */
private int fLast;
/** The amount of characters already read on first call to nextToken(). */
private int fPrefixLength;
// emulate JavaPartitionScanner
private boolean fEmulate = false;
private int fJavaOffset;
private int fJavaLength;
private final Token[] fTokens = new Token[]{
new TokenImpl(null),
new TokenImpl(JAVA_SINGLE_LINE_COMMENT),
new TokenImpl(JAVA_MULTI_LINE_COMMENT),
new TokenImpl(JAVA_DOC),
new TokenImpl(JAVA_CHARACTER),
new TokenImpl(JAVA_STRING)
};
public JavaPartitionScanner(boolean emulate) {
fEmulate = emulate;
}
@Inject
public JavaPartitionScanner() {
this(false);
}
/*
* @see org.eclipse.jface.text.rules.ITokenScanner#nextToken()
*/
public Token nextToken() {
// emulate JavaPartitionScanner
if (fEmulate) {
if (fJavaOffset != -1 && fTokenOffset + fTokenLength != fJavaOffset + fJavaLength) {
fTokenOffset += fTokenLength;
return fTokens[JAVA];
} else {
fJavaOffset = -1;
fJavaLength = 0;
}
}
fTokenOffset += fTokenLength;
fTokenLength = fPrefixLength;
while (true) {
final int ch = fScanner.read();
// characters
switch (ch) {
case CharacterScanner.EOF:
if (fTokenLength > 0) {
fLast = NONE; // ignore last
return preFix(fState, JAVA, NONE, 0);
} else {
fLast = NONE;
fPrefixLength = 0;
return TokenImpl.EOF;
}
case '\r':
// emulate JavaPartitionScanner
if (!fEmulate && fLast != CARRIAGE_RETURN) {
fLast = CARRIAGE_RETURN;
fTokenLength++;
continue;
} else {
switch (fState) {
case SINGLE_LINE_COMMENT:
case CHARACTER:
case STRING:
if (fTokenLength > 0) {
final Token token = fTokens[fState];
// emulate JavaPartitionScanner
if (fEmulate) {
fTokenLength++;
fLast = NONE;
fPrefixLength = 0;
} else {
fLast = CARRIAGE_RETURN;
fPrefixLength = 1;
}
fState = JAVA;
return token;
} else {
consume();
continue;
}
default:
consume();
continue;
}
}
case '\n':
switch (fState) {
case SINGLE_LINE_COMMENT:
case CHARACTER:
case STRING:
// assert(fTokenLength > 0);
return postFix(fState);
default:
consume();
continue;
}
default:
if (!fEmulate && fLast == CARRIAGE_RETURN) {
switch (fState) {
case SINGLE_LINE_COMMENT:
case CHARACTER:
case STRING:
int last;
int newState;
switch (ch) {
case '/':
last = SLASH;
newState = JAVA;
break;
case '*':
last = STAR;
newState = JAVA;
break;
case '\'':
last = NONE;
newState = CHARACTER;
break;
case '"':
last = NONE;
newState = STRING;
break;
case '\r':
last = CARRIAGE_RETURN;
newState = JAVA;
break;
case '\\':
last = BACKSLASH;
newState = JAVA;
break;
default:
last = NONE;
newState = JAVA;
break;
}
fLast = NONE; // ignore fLast
return preFix(fState, newState, last, 1);
default:
break;
}
}
}
// states
switch (fState) {
case JAVA:
switch (ch) {
case '/':
if (fLast == SLASH) {
if (fTokenLength - getLastLength(fLast) > 0) {
return preFix(JAVA, SINGLE_LINE_COMMENT, NONE, 2);
} else {
preFix(JAVA, SINGLE_LINE_COMMENT, NONE, 2);
fTokenOffset += fTokenLength;
fTokenLength = fPrefixLength;
break;
}
} else {
fTokenLength++;
fLast = SLASH;
break;
}
case '*':
if (fLast == SLASH) {
if (fTokenLength - getLastLength(fLast) > 0) {
return preFix(JAVA, MULTI_LINE_COMMENT, SLASH_STAR, 2);
} else {
preFix(JAVA, MULTI_LINE_COMMENT, SLASH_STAR, 2);
fTokenOffset += fTokenLength;
fTokenLength = fPrefixLength;
break;
}
} else {
consume();
break;
}
case '\'':
fLast = NONE; // ignore fLast
if (fTokenLength > 0) {
return preFix(JAVA, CHARACTER, NONE, 1);
} else {
preFix(JAVA, CHARACTER, NONE, 1);
fTokenOffset += fTokenLength;
fTokenLength = fPrefixLength;
break;
}
case '"':
fLast = NONE; // ignore fLast
if (fTokenLength > 0) {
return preFix(JAVA, STRING, NONE, 1);
} else {
preFix(JAVA, STRING, NONE, 1);
fTokenOffset += fTokenLength;
fTokenLength = fPrefixLength;
break;
}
default:
consume();
break;
}
break;
case SINGLE_LINE_COMMENT:
consume();
break;
case JAVADOC:
switch (ch) {
case '/':
switch (fLast) {
case SLASH_STAR_STAR:
return postFix(MULTI_LINE_COMMENT);
case STAR:
return postFix(JAVADOC);
default:
consume();
break;
}
break;
case '*':
fTokenLength++;
fLast = STAR;
break;
default:
consume();
break;
}
break;
case MULTI_LINE_COMMENT:
switch (ch) {
case '*':
if (fLast == SLASH_STAR) {
fLast = SLASH_STAR_STAR;
fTokenLength++;
fState = JAVADOC;
} else {
fTokenLength++;
fLast = STAR;
}
break;
case '/':
if (fLast == STAR) {
return postFix(MULTI_LINE_COMMENT);
} else {
consume();
break;
}
default:
consume();
break;
}
break;
case STRING:
switch (ch) {
case '\\':
fLast = (fLast == BACKSLASH) ? NONE : BACKSLASH;
fTokenLength++;
break;
case '\"':
if (fLast != BACKSLASH) {
return postFix(STRING);
} else {
consume();
break;
}
default:
consume();
break;
}
break;
case CHARACTER:
switch (ch) {
case '\\':
fLast = (fLast == BACKSLASH) ? NONE : BACKSLASH;
fTokenLength++;
break;
case '\'':
if (fLast != BACKSLASH) {
return postFix(CHARACTER);
} else {
consume();
break;
}
default:
consume();
break;
}
break;
default:
break;
}
}
}
private static final int getLastLength(int last) {
switch (last) {
default:
return -1;
case NONE:
return 0;
case CARRIAGE_RETURN:
case BACKSLASH:
case SLASH:
case STAR:
return 1;
case SLASH_STAR:
return 2;
case SLASH_STAR_STAR:
return 3;
}
}
private final void consume() {
fTokenLength++;
fLast = NONE;
}
private final Token postFix(int state) {
fTokenLength++;
fLast = NONE;
fState = JAVA;
fPrefixLength = 0;
return fTokens[state];
}
private final Token preFix(int state, int newState, int last, int prefixLength) {
// emulate JavaPartitionScanner
if (fEmulate && state == JAVA && (fTokenLength - getLastLength(fLast) > 0)) {
fTokenLength -= getLastLength(fLast);
fJavaOffset = fTokenOffset;
fJavaLength = fTokenLength;
fTokenLength = 1;
fState = newState;
fPrefixLength = prefixLength;
fLast = last;
return fTokens[state];
} else {
fTokenLength -= getLastLength(fLast);
fLast = last;
fPrefixLength = prefixLength;
final Token token = fTokens[state];
fState = newState;
return token;
}
}
public void setScannedString(String content) {
fScanner.setScannedString(content);
fTokenOffset = 0;
fTokenLength = 0;
fPrefixLength = 0;
fLast = NONE;
fState = JAVA;
// emulate JavaPartitionScanner
if (fEmulate) {
fJavaOffset = -1;
fJavaLength = 0;
}
}
@Override
public void setLegalLineDelimiters(final List<String> delimiters) {
this.fScanner.setLegalLineDelimiters(delimiters);
}
/*
* @see ITokenScanner#getTokenLength()
*/
public int getTokenLength() {
return fTokenLength;
}
/*
* @see ITokenScanner#getTokenOffset()
*/
public int getTokenOffset() {
return fTokenOffset;
}
}