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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 static com.google.gitiles.doc.SmartQuoted.Type.DOUBLE;
import static com.google.gitiles.doc.SmartQuoted.Type.SINGLE;
import com.google.gitiles.doc.SmartQuoted.Type;
import org.commonmark.Extension;
import org.commonmark.node.Node;
import org.commonmark.node.Text;
import org.commonmark.parser.Parser;
import org.commonmark.parser.Parser.ParserExtension;
import org.commonmark.parser.delimiter.DelimiterProcessor;
import org.commonmark.parser.delimiter.DelimiterRun;
/** Uses smart quotes for ' and ". */
public class SmartQuotedExtension implements ParserExtension {
public static Extension create() {
return new SmartQuotedExtension();
}
private SmartQuotedExtension() {}
@Override
public void extend(Parser.Builder builder) {
builder.customDelimiterProcessor(new QuotedProcessor(SINGLE, '\''));
builder.customDelimiterProcessor(new QuotedProcessor(DOUBLE, '"'));
}
private static void quote(Type type, Text opener, Text closer) {
SmartQuoted quote = new SmartQuoted();
quote.setType(type);
for (Node t = opener.getNext(); t != null && t != closer; ) {
Node next = t.getNext();
quote.appendChild(t);
t = next;
}
opener.insertAfter(quote);
}
/** Parses single and double quoted strings for smart quotes. */
private static class QuotedProcessor implements DelimiterProcessor {
private final SmartQuoted.Type type;
private final char delim;
QuotedProcessor(SmartQuoted.Type type, char open) {
this.type = type;
this.delim = open;
}
@Override
public char getOpeningCharacter() {
return delim;
}
@Override
public char getClosingCharacter() {
return delim;
}
@Override
public int getMinLength() {
return 1;
}
@Override
public int getDelimiterUse(DelimiterRun opener, DelimiterRun closer) {
return 1;
}
@Override
public void process(Text opener, Text closer, int delimiterUse) {
quote(type, opener, closer);
}
}
}