/*******************************************************************************
* Copyright 2017 Ivan Shubin http://galenframework.com
* 
* 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.galenframework.parser;

public class ExpectString implements Expectation<String>{

    private char quotesSymbol = '"';

    @Override
    public String read(StringCharReader reader) {
        StringBuffer buffer = new StringBuffer();
        while(reader.hasMore()) {
            char symbol = reader.next();
            
            if (symbol == quotesSymbol) {
                break;
            }
            else if (symbol == '\\') {
                if (reader.hasMore()) {
                    buffer.append(asEscapeSymbol(reader.next()));
                }
                else {
                    buffer.append("\\");
                    break;
                }
            }
            else {
                buffer.append(symbol);
            }
        }
        return buffer.toString();
    }

    private char asEscapeSymbol(char symbol) {
        if (symbol == 'n') {
            return '\n';
        }
        if (symbol == 't') {
            return '\t';
        }
        if (symbol == 'b') {
            return '\b';
        }
        if (symbol == 'r') {
            return '\r';
        }
        if (symbol == 'f') {
            return '\f';
        }
        else return symbol;
    }

    public ExpectString setQuotesSymbol(char symbol) {
        this.quotesSymbol = symbol;
        return this;
    }

}