/*******************************************************************************
* Copyright (c) 2007, 2013 David Green and others.
* 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:
* David Green - initial API and implementation
*******************************************************************************/
package org.eclipse.mylyn.wikitext.textile.internal.phrase;
import org.eclipse.mylyn.wikitext.parser.Attributes;
import org.eclipse.mylyn.wikitext.parser.DocumentBuilder.SpanType;
import org.eclipse.mylyn.wikitext.parser.markup.PatternBasedElement;
import org.eclipse.mylyn.wikitext.parser.markup.PatternBasedElementProcessor;
import org.eclipse.mylyn.wikitext.textile.internal.Textile;
/**
* A simple phrase modifier implementation that matches a pattern in text and emits a {@link SpanType span} containing
* the content of the matched region.
*
* @author David Green
*/
public class SimpleTextilePhraseModifier extends PatternBasedElement {
public enum Mode {
/**
* normal phrase content is processed
*/
NORMAL,
/**
* special phrase content, ie: no token replacement
*/
SPECIAL,
/**
* phrase may contain other nested phrases
*/
NESTING,
}
protected static final int CONTENT_GROUP = Textile.ATTRIBUTES_GROUP_COUNT + 1;
protected static final int ATTRIBUTES_OFFSET = 1;
private static class SimplePhraseModifierProcessor extends PatternBasedElementProcessor {
private final SpanType spanType;
private final Mode mode;
public SimplePhraseModifierProcessor(SpanType spanType, Mode mode) {
this.spanType = spanType;
this.mode = mode;
}
@Override
public void emit() {
Attributes attributes = new Attributes();
configureAttributes(this, attributes);
getBuilder().beginSpan(spanType, attributes);
switch (mode) {
case NESTING:
getMarkupLanguage().emitMarkupLine(parser, state, getStart(this), getContent(this), 0);
break;
case NORMAL:
getMarkupLanguage().emitMarkupText(parser, state, getContent(this));
break;
case SPECIAL:
getBuilder().characters(getContent(this));
break;
}
getBuilder().endSpan();
}
}
private final String delimiter;
private final SpanType spanType;
private final Mode mode;
/**
* @param delimiter
* the text pattern to detect
* @param spanType
* the type of span to be emitted for this phrase modifier
* @param nesting
* indicate if this phrase modifier allows nested phrase modifiers
*/
public SimpleTextilePhraseModifier(String delimiter, SpanType spanType, Mode mode) {
this.delimiter = delimiter;
this.spanType = spanType;
this.mode = mode;
}
@Override
protected String getPattern(int groupOffset) {
String quotedDelimiter = quoteLite(getDelimiter());
String firstCharacterOfDelimiter = quoteLite(getDelimiter().substring(0, 1));
return quotedDelimiter
+ "(?!" + firstCharacterOfDelimiter + ")" + Textile.REGEX_ATTRIBUTES + "([^\\s" + quotedDelimiter //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
+ "]+|\\S(?:.*?\\S)?)" + // content //$NON-NLS-1$
"(?<!" + firstCharacterOfDelimiter + ")" + quotedDelimiter; //$NON-NLS-1$ //$NON-NLS-2$
}
/**
* quote a literal for use in a regular expression
*/
private String quoteLite(String literal) {
StringBuilder buf = new StringBuilder(literal.length() * 2);
for (int x = 0; x < literal.length(); ++x) {
char c = literal.charAt(x);
switch (c) {
case '^':
case '*':
case '?':
case '+':
case '-':
buf.append('\\');
}
buf.append(c);
}
return buf.toString();
}
@Override
protected int getPatternGroupCount() {
return Textile.ATTRIBUTES_GROUP_COUNT + 1;
}
protected String getDelimiter() {
return delimiter;
}
protected static void configureAttributes(PatternBasedElementProcessor processor, Attributes attributes) {
Textile.configureAttributes(processor, attributes, ATTRIBUTES_OFFSET, false);
}
protected static String getContent(PatternBasedElementProcessor processor) {
return processor.group(CONTENT_GROUP);
}
protected static int getStart(PatternBasedElementProcessor processor) {
return processor.start(CONTENT_GROUP);
}
@Override
protected PatternBasedElementProcessor newProcessor() {
return new SimplePhraseModifierProcessor(spanType, mode);
}
}