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/*
 * Copyright (c) 2018, 2019, 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,
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 */

package com.oracle.truffle.regex.tregex.util;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class LaTexExport {

    private static final Pattern specialChars = Pattern.compile("[&%$#_{}~^\\\\]");

    public static String escape(String str) {
        StringBuffer escapedString = new StringBuffer();
        Matcher m = specialChars.matcher(str);
        while (m.find()) {
            String replacement;
            switch (str.charAt(m.start())) {
                case '&':
                    replacement = "\\\\&";
                    break;
                case '%':
                    replacement = "\\\\%";
                    break;
                case '$':
                    replacement = "\\\\\\$";
                    break;
                case '#':
                    replacement = "\\\\#";
                    break;
                case '_':
                    replacement = "\\\\_";
                    break;
                case '{':
                    replacement = "\\\\{";
                    break;
                case '}':
                    replacement = "\\\\}";
                    break;
                case '~':
                    replacement = "\\\\textasciitilde ";
                    break;
                case '^':
                    replacement = "\\\\textasciicircum ";
                    break;
                case '\\':
                    replacement = "\\\\textbackslash ";
                    break;
                default:
                    throw Exceptions.shouldNotReachHere();
            }
            m.appendReplacement(escapedString, replacement);
        }
        m.appendTail(escapedString);
        return escapedString.toString();
    }
}