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JSON5 / HJSON parser and preprocessor which preserves ordering and comments
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/*
 * MIT License
 *
 * Copyright (c) 2018-2019 Falkreon (Isaac Ellingson)
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

package blue.endless.jankson.impl;

import blue.endless.jankson.Jankson;
import blue.endless.jankson.api.SyntaxError;

public class CommentParserContext implements ParserContext {
	int firstChar = -1;
	int secondChar = -1;
	
	StringBuilder result = new StringBuilder();
	
	int prevChar = -1;
	
	boolean multiLine = false;
	boolean done = false;
	
	public CommentParserContext(int codePoint) {
		firstChar = codePoint;
	}
	
	@Override
	public boolean consume(int codePoint, Jankson loader) throws SyntaxError {
		if (done) return false;
		
		if (firstChar==-1) {
			if (codePoint!='/' && codePoint!='#') {
				throw new SyntaxError("Was expecting the start of a comment, but found '"+(char)codePoint+"' instead.");
			}
			firstChar = codePoint;
			if (firstChar=='#') multiLine = false;
			return true;
		}
		
		if (secondChar==-1 && firstChar!='#') {
			secondChar = codePoint;
			if (codePoint=='*') {
				multiLine = true;
				return true;
			} else if (codePoint=='/') {
				multiLine = false;
				return true;
			} else {
				if (Character.isWhitespace(codePoint)) {
					throw new SyntaxError("Was expecting the start of a comment, but found whitespace instead.");
				} else {
					throw new SyntaxError("Was expecting the start of a comment, but found '"+(char)codePoint+"' instead.");
				}
			}
		}
		
		//We're past the initiating character(s)
		if (multiLine) {
			if (codePoint=='/' && prevChar=='*') {
				result.deleteCharAt(result.length()-1); //Get rid of the *
				done = true;
				return true;
			} else {
				prevChar = codePoint;
				result.append((char)codePoint);
				return true;
			}
		} else {
			if (codePoint=='\n') {
				done = true;
				return true;
			} else {
				prevChar = codePoint; //Not really necessary but whatever. For consistency! :)
				result.append((char)codePoint);
				return true;
			}
		}
	}

	@Override
	public void eof() throws SyntaxError {
		if (multiLine) throw new SyntaxError("Unexpected end-of-file while reading a multiline comment.");
	}

	@Override
	public boolean isComplete() {
		return done;
	}

	@Override
	public String getResult() throws SyntaxError {
		return result.toString().trim();
	}

}