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The JWebSwing implementation for Source Code Prettify

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// Copyright (C) 2012 Jeffrey B. Arnold
//
// 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.


/**
 * @fileoverview
 * Registers a language handler for S, S-plus, and R source code.
 *
 *
 * To use, include prettify.js and this file in your HTML page.
 * Then put your code in an HTML tag like
 *       code 
 *
 * Language definition from
 * http://cran.r-project.org/doc/manuals/R-lang.html.
 * Many of the regexes are shared  with the pygments SLexer,
 * http://pygments.org/.
 *
 * Original: https://raw.github.com/jrnold/prettify-lang-r-bugs/master/lang-r.js
 *
 * @author [email protected]
 */
PR['registerLangHandler'](
    PR['createSimpleLexer'](
        [
            [PR['PR_PLAIN'], /^[\t\n\r \xA0]+/, null, '\t\n\r \xA0'],
            [PR['PR_STRING'], /^\"(?:[^\"\\]|\\[\s\S])*(?:\"|$)/, null, '"'],
            [PR['PR_STRING'], /^\'(?:[^\'\\]|\\[\s\S])*(?:\'|$)/, null, "'"]
        ],
        [
            [PR['PR_COMMENT'], /^#.*/],
            [PR['PR_KEYWORD'], /^(?:if|else|for|while|repeat|in|next|break|return|switch|function)(?![A-Za-z0-9_.])/],
            // hex numbes
            [PR['PR_LITERAL'], /^0[xX][a-fA-F0-9]+([pP][0-9]+)?[Li]?/],
            // Decimal numbers
            [PR['PR_LITERAL'], /^[+-]?([0-9]+(\.[0-9]+)?|\.[0-9]+)([eE][+-]?[0-9]+)?[Li]?/],
            // builtin symbols
            [PR['PR_LITERAL'], /^(?:NULL|NA(?:_(?:integer|real|complex|character)_)?|Inf|TRUE|FALSE|NaN|\.\.(?:\.|[0-9]+))(?![A-Za-z0-9_.])/],
            // assignment, operators, and parens, etc.
            [PR['PR_PUNCTUATION'], /^(?:<>?|-|==|<=|>=|<|>|&&?|!=|\|\|?|\*|\+|\^|\/|!|%.*?%|=|~|\$|@|:{1,3}|[\[\](){};,?])/],
            // valid variable names
            [PR['PR_PLAIN'], /^(?:[A-Za-z]+[A-Za-z0-9_.]*|\.[a-zA-Z_][0-9a-zA-Z\._]*)(?![A-Za-z0-9_.])/],
            // string backtick
            [PR['PR_STRING'], /^`.+`/]
        ]),
    ['r', 's', 'R', 'S', 'Splus']);