// Copyright (C) 2008 Google Inc.
//
// 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 Lua.
*
*
* 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-lua">(my Lua code)</pre>
*
*
* I used http://www.lua.org/manual/5.1/manual.html#2.1
* Because of the long-bracket concept used in strings and comments, Lua does
* not have a regular lexical grammar, but luckily it fits within the space
* of irregular grammars supported by javascript regular expressions.
*
* @author mikesamuel@gmail.com
*/
PR['registerLangHandler'](
PR['createSimpleLexer'](
[
// Whitespace
[PR['PR_PLAIN'], /^[\t\n\r \xA0]+/, null, '\t\n\r \xA0'],
// A double or single quoted, possibly multi-line, string.
[PR['PR_STRING'], /^(?:\"(?:[^\"\\]|\\[\s\S])*(?:\"|$)|\'(?:[^\'\\]|\\[\s\S])*(?:\'|$))/, null, '"\'']
],
[
// A comment is either a line comment that starts with two dashes, or
// two dashes preceding a long bracketed block.
[PR['PR_COMMENT'], /^--(?:\[(=*)\[[\s\S]*?(?:\]\1\]|$)|[^\r\n]*)/],
// A long bracketed block not preceded by -- is a string.
[PR['PR_STRING'], /^\[(=*)\[[\s\S]*?(?:\]\1\]|$)/],
[PR['PR_KEYWORD'], /^(?:and|break|do|else|elseif|end|false|for|function|if|in|local|nil|not|or|repeat|return|then|true|until|while)\b/, null],
// A number is a hex integer literal, a decimal real literal, or in
// scientific notation.
[PR['PR_LITERAL'],
/^[+-]?(?:0x[\da-f]+|(?:(?:\.\d+|\d+(?:\.\d*)?)(?:e[+\-]?\d+)?))/i],
// An identifier
[PR['PR_PLAIN'], /^[a-z_]\w*/i],
// A run of punctuation
[PR['PR_PUNCTUATION'], /^[^\w\t\n\r \xA0][^\w\t\n\r \xA0\"\'\-\+=]*/]
]),
['lua']);
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