/*******************************************************************************
* Copyright (c) 2007, 2014 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.mediawiki.internal.block;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.eclipse.mylyn.wikitext.mediawiki.MediaWikiLanguage;
import org.eclipse.mylyn.wikitext.mediawiki.internal.phrase.EscapePhraseModifier;
import org.eclipse.mylyn.wikitext.parser.Attributes;
import org.eclipse.mylyn.wikitext.parser.DocumentBuilder.BlockType;
import org.eclipse.mylyn.wikitext.parser.markup.Block;
/**
* Matches any markup text.
*
* @author David Green
*/
public class ParagraphBlock extends Block {
private static final Pattern ESCAPE_PHRASE_MODIFIER_PATTERN = Pattern.compile(new EscapePhraseModifier().getPattern(0));
private static final Pattern NESTED_BLOCK_START_PATTERN = Pattern.compile("<!--", Pattern.CASE_INSENSITIVE); //$NON-NLS-1$
private static final int NESTED_BLOCK_START_GROUP = 0;
private int blockLineCount = 0;
private boolean newlinesCauseLineBreak = false;
private final boolean testPreformattedBlocks;
private int nestedStartOffset = -1;
private int nestedLineNumber = -1;
private int lastLineNumber = -1;
public ParagraphBlock(boolean testPreformattedBlocks) {
this.testPreformattedBlocks = testPreformattedBlocks;
}
public boolean isNewlinesCauseLineBreak() {
return newlinesCauseLineBreak;
}
public void setNewlinesCauseLineBreak(boolean newlinesCauseLineBreak) {
this.newlinesCauseLineBreak = newlinesCauseLineBreak;
}
@Override
public int processLineContent(String line, int offset) {
nestedStartOffset = -1;
nestedLineNumber = -1;
if (blockLineCount == 0) {
Attributes attributes = new Attributes();
builder.beginBlock(BlockType.PARAGRAPH, attributes);
}
if (markupLanguage.isEmptyLine(line)) {
setClosed(true);
return 0;
}
MediaWikiLanguage dialect = (MediaWikiLanguage) getMarkupLanguage();
// paragraphs can have nested lists and other things
for (Block block : dialect.getParagraphBreakingBlocks()) {
if (block.canStart(line, offset)) {
setClosed(true);
return offset;
}
}
nestedStartOffset = calculateNestedStartOffset(line, offset);
if (nestedStartOffset != -1) {
nestedLineNumber = getState().getLineNumber();
}
++blockLineCount;
if (testPreformattedBlocks && offset == 0 && line.length() > 0 && line.charAt(0) == ' ') {
// a preformatted block.
setClosed(true);
return 0;
}
if (blockLineCount != 1 && nestedStartOffset == -1 && lastLineNumber != getState().getLineNumber()) {
// note: normally newlines don't automatically convert to line breaks
if (newlinesCauseLineBreak) {
builder.lineBreak();
} else {
builder.characters("\n"); //$NON-NLS-1$
}
}
if (nestedStartOffset > 0) {
line = line.substring(0, nestedStartOffset);
}
if (nestedStartOffset != offset) {
dialect.emitMarkupLine(getParser(), state, line, offset);
}
lastLineNumber = getState().getLineNumber();
return nestedStartOffset;
}
private static int calculateNestedStartOffset(String line, int offset) {
int nestedStartOffset = -1;
Matcher nestedStartMatcher = NESTED_BLOCK_START_PATTERN.matcher(line);
if (offset > 0) {
nestedStartMatcher.region(offset, line.length());
}
if (nestedStartMatcher.find()) {
nestedStartOffset = nestedStartMatcher.start(NESTED_BLOCK_START_GROUP);
if (isEscaped(line, offset, nestedStartOffset)) {
nestedStartOffset = -1;
}
}
return nestedStartOffset;
}
private static boolean isEscaped(String line, int lineOffset, int offset) {
Matcher matcher = ESCAPE_PHRASE_MODIFIER_PATTERN.matcher(line);
if (lineOffset > 0) {
matcher.region(lineOffset, line.length());
}
while (matcher.find()) {
int start = matcher.start();
int end = matcher.end();
if (start <= offset && end >= offset) {
return true;
}
}
return false;
}
@Override
public boolean beginNesting() {
return nestedStartOffset != -1;
}
@Override
public int findCloseOffset(String line, int lineOffset) {
return -1;
}
@Override
public boolean canResume(String line, int lineOffset) {
if (getState().getLineNumber() == nestedLineNumber && lineOffset == nestedStartOffset) {
return false;
}
return true;
}
@Override
public boolean canStart(String line, int lineOffset) {
blockLineCount = 0;
return true;
}
@Override
public void setClosed(boolean closed) {
if (closed && !isClosed()) {
builder.endBlock();
}
super.setClosed(closed);
}
}