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/*******************************************************************************
* Copyright (c) 2006, 2016 Red Hat, Inc.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* Red Hat Incorporated - initial API and implementation
*******************************************************************************/
package org.eclipse.cdt.autotools.ui.editors;
import org.eclipse.jface.text.rules.ICharacterScanner;
import org.eclipse.jface.text.rules.IRule;
import org.eclipse.jface.text.rules.IToken;
import org.eclipse.jface.text.rules.IWhitespaceDetector;
import org.eclipse.jface.text.rules.IWordDetector;
import org.eclipse.jface.text.rules.Token;
public class InlineDataRule implements IRule {
/**
* The default token to be returned on success and if nothing else has been
* specified.
*/
protected IToken token;
protected IWordDetector fDetector;
protected IWhitespaceDetector fWsDetector = new AutoconfWhitespaceDetector();
/** The column constraint */
protected int fColumn = UNDEFINED;
/** Internal setting for the un-initialized column constraint */
protected static final int UNDEFINED = -1;
/** Buffer used for pattern detection */
private StringBuilder fBuffer = new StringBuilder();
private String fStartingSequence = "<<";
public InlineDataRule(IToken inToken) {
token = inToken;
}
// Confirm an EOL delimeter after already matching first delimeter character.
protected boolean confirmDelimeter(ICharacterScanner scanner, char[] delimeter) {
int c = scanner.read();
StringBuilder buffer = new StringBuilder();
buffer.append((char)c);
for (int i = 1; i < delimeter.length; ++i) {
if (c == delimeter[i]) {
c = scanner.read();
buffer.append((char)c);
} else {
for (int j = buffer.length() - 1; j >= 0; j--)
scanner.unread();
return false;
}
}
scanner.unread();
return true;
}
@Override
public IToken evaluate(ICharacterScanner scanner) {
int c = scanner.read();
fBuffer.setLength(0);
// Looking for <<WORD or <<-WORD or <<'WORD' at end of line.
for (int i = 0; i < fStartingSequence.length(); i++) {
fBuffer.append((char) c);
if (fStartingSequence.charAt(i) != c) {
unreadBuffer(scanner);
return Token.UNDEFINED;
}
c = scanner.read();
}
char[][] lineDelimeters = scanner.getLegalLineDelimiters();
StringBuilder endMarkerBuffer = new StringBuilder();
if (c == '-') {
fBuffer.append((char)c);
c = scanner.read();
} else if (c == '\'') {
fBuffer.append((char)c);
c = scanner.read();
}
while (c != ICharacterScanner.EOF &&
Character.isJavaIdentifierPart((char)c) &&
c != '\'') {
fBuffer.append((char)c);
endMarkerBuffer.append((char)c);
c = scanner.read();
}
if (c == '\'') {
fBuffer.append((char)c);
c = scanner.read();
}
if (endMarkerBuffer.length() == 0) {
unreadBuffer(scanner);
return Token.UNDEFINED;
}
// At this point we read until we find id by itself on its own line
boolean eol = false;
boolean finished = false;
boolean foundMarker = false;
String endMarker = endMarkerBuffer.toString();
while (!finished && c != ICharacterScanner.EOF) {
for (int i = 0; i < lineDelimeters.length; ++i) {
if (c == lineDelimeters[i][0]) {
if (confirmDelimeter(scanner, lineDelimeters[i])) {
c = scanner.read();
eol = true;
break;
}
}
}
if (eol) {
eol = false;
if (foundMarker) {
// We get here if we have found the marker by itself
// on the line
finished = true;
} else {
foundMarker = false;
int j = 0;
while (j < endMarker.length()) {
if (c == endMarker.charAt(j)) {
c = scanner.read();
++j;
} else {
break;
}
}
if (j == endMarker.length()) {
foundMarker = true;
}
}
} else {
// otherwise ignore all other characters
eol = false;
foundMarker = false;
c = scanner.read();
}
}
// unread last character
scanner.unread();
return token;
}
/**
* Returns the characters in the buffer to the scanner.
*
* @param scanner
* the scanner to be used
*/
protected void unreadBuffer(ICharacterScanner scanner) {
for (int i = fBuffer.length() - 1; i >= 0; i--)
scanner.unread();
}
}
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