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The JWebSwing implementation for Source Code Prettify

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// Copyright (C) 2012 Jeffrey 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
 * Support for R documentation (Rd) files
 *
 * Minimal highlighting or Rd files, basically just highlighting
 * macros. It does not try to identify verbatim or R-like regions of
 * macros as that is too complicated for a lexer.  Descriptions of the
 * Rd format can be found
 * http://cran.r-project.org/doc/manuals/R-exts.html and
 * http://developer.r-project.org/parseRd.pdf.
 *
 * @author Jeffrey Arnold
 */
PR['registerLangHandler'](
    PR['createSimpleLexer'](
        [
            // whitespace
            [PR['PR_PLAIN'], /^[\t\n\r \xA0]+/, null, '\t\n\r \xA0'],
            // all comments begin with '%'
            [PR['PR_COMMENT'], /^%[^\r\n]*/, null, '%']
        ],
        [// special macros with no args
            [PR['PR_LITERAL'], /^\\(?:cr|l?dots|R|tab)\b/],
            // macros
            [PR['PR_KEYWORD'], /^\\[a-zA-Z@]+/],
            // highlighted as macros, since technically they are
            [PR['PR_KEYWORD'], /^#(?:ifn?def|endif)/],
            // catch escaped brackets
            [PR['PR_PLAIN'], /^\\[{}]/],
            // punctuation
            [PR['PR_PUNCTUATION'], /^[{}()\[\]]+/]
        ]),
    ['Rd', 'rd']);