/*
 * Copyright (c) 2018, 2020, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * The Universal Permissive License (UPL), Version 1.0
 *
 * Subject to the condition set forth below, permission is hereby granted to any
 * person obtaining a copy of this software, associated documentation and/or
 * data (collectively the "Software"), free of charge and under any and all
 * copyright rights in the Software, and any and all patent rights owned or
 * freely licensable by each licensor hereunder covering either (i) the
 * unmodified Software as contributed to or provided by such licensor, or (ii)
 * the Larger Works (as defined below), to deal in both
 *
 * (a) the Software, and
 *
 * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
 * one is included with the Software each a "Larger Work" to which the Software
 * is contributed by such licensors),
 *
 * without restriction, including without limitation the rights to copy, create
 * derivative works of, display, perform, and distribute the Software and make,
 * use, sell, offer for sale, import, export, have made, and have sold the
 * Software and the Larger Work(s), and to sublicense the foregoing rights on
 * either these or other terms.
 *
 * This license is subject to the following condition:
 *
 * The above copyright notice and either this complete permission notice or at a
 * minimum a reference to the UPL must 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 com.oracle.truffle.js.parser.json;

public class JSONParserUtil {
    
Implementation of the Quote(value) operation as defined in the ECMAscript spec. It wraps a
String value in double quotes and escapes characters within.
Params:
value – string to quote
Returns:
quoted and escaped string/**
     * Implementation of the Quote(value) operation as defined in the ECMAscript spec. It wraps a
     * String value in double quotes and escapes characters within.
     *
     * @param value string to quote
     *
     * @return quoted and escaped string
     */
    public static String quote(final String value) {
        final StringBuilder product = new StringBuilder();
        product.append("\"");
        for (final char ch : value.toCharArray()) {
            if (ch < ' ') {
                if (ch == '\b') {
                    product.append("\\b");
                } else if (ch == '\f') {
                    product.append("\\f");
                } else if (ch == '\n') {
                    product.append("\\n");
                } else if (ch == '\r') {
                    product.append("\\r");
                } else if (ch == '\t') {
                    product.append("\\t");
                } else {
                    product.append(unicodeEscape(ch));
                }
            } else {
                if (ch == '\\') {
                    product.append("\\\\");
                } else if (ch == '"') {
                    product.append("\\\"");
                } else {
                    product.append(ch);
                }
            }
        }
        product.append("\"");
        return product.toString();
    }

    private static String unicodeEscape(final char ch) {
        final StringBuilder sb = new StringBuilder();

        sb.append("\\u");

        final String hex = Integer.toHexString(ch);
        for (int i = hex.length(); i < 4; i++) {
            sb.append('0');
        }
        sb.append(hex);

        return sb.toString();
    }
}