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// Copyright (C) 2016 The Android Open Source Project
//
// 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.google.gitiles.doc;
import org.commonmark.Extension;
import org.commonmark.node.Block;
import org.commonmark.parser.Parser;
import org.commonmark.parser.Parser.ParserExtension;
import org.commonmark.parser.block.AbstractBlockParser;
import org.commonmark.parser.block.AbstractBlockParserFactory;
import org.commonmark.parser.block.BlockContinue;
import org.commonmark.parser.block.BlockStart;
import org.commonmark.parser.block.MatchedBlockParser;
import org.commonmark.parser.block.ParserState;
/** CommonMark extension for {@code [TOC]}. */
public class TocExtension implements ParserExtension {
public static Extension create() {
return new TocExtension();
}
private TocExtension() {}
@Override
public void extend(Parser.Builder builder) {
builder.customBlockParserFactory(new TocParserFactory());
}
private static class TocParser extends AbstractBlockParser {
private final TocBlock block = new TocBlock();
@Override
public Block getBlock() {
return block;
}
@Override
public BlockContinue tryContinue(ParserState parserState) {
return BlockContinue.none();
}
}
private static class TocParserFactory extends AbstractBlockParserFactory {
@Override
public BlockStart tryStart(ParserState state, MatchedBlockParser matched) {
if (state.getIndent() == 0) {
CharSequence line = state.getLine();
int s = state.getNextNonSpaceIndex();
if ("[TOC]".contentEquals(line.subSequence(s, line.length()))) {
return BlockStart.of(new TocParser()).atIndex(line.length());
}
}
return BlockStart.none();
}
}
}