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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
* <pre class="prettyprint lang-r"> code </pre>
*
* 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 jeffrey.arnold@gmail.com
*/
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']);