60 lines
2.4 KiB
JavaScript
60 lines
2.4 KiB
JavaScript
// Copyright (C) 2008 Google Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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/**
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* @fileoverview
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* Registers a language handler for Lua.
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*
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*
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* To use, include prettify.js and this file in your HTML page.
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* Then put your code in an HTML tag like
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* <pre class="prettyprint lang-lua">(my Lua code)</pre>
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*
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*
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* I used http://www.lua.org/manual/5.1/manual.html#2.1
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* Because of the long-bracket concept used in strings and comments, Lua does
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* not have a regular lexical grammar, but luckily it fits within the space
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* of irregular grammars supported by javascript regular expressions.
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*
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* @author mikesamuel@gmail.com
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*/
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PR['registerLangHandler'](
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PR['createSimpleLexer'](
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[
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// Whitespace
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[PR['PR_PLAIN'], /^[\t\n\r \xA0]+/, null, '\t\n\r \xA0'],
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// A double or single quoted, possibly multi-line, string.
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[PR['PR_STRING'], /^(?:\"(?:[^\"\\]|\\[\s\S])*(?:\"|$)|\'(?:[^\'\\]|\\[\s\S])*(?:\'|$))/, null, '"\'']
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],
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[
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// A comment is either a line comment that starts with two dashes, or
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// two dashes preceding a long bracketed block.
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[PR['PR_COMMENT'], /^--(?:\[(=*)\[[\s\S]*?(?:\]\1\]|$)|[^\r\n]*)/],
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// A long bracketed block not preceded by -- is a string.
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[PR['PR_STRING'], /^\[(=*)\[[\s\S]*?(?:\]\1\]|$)/],
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[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],
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// A number is a hex integer literal, a decimal real literal, or in
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// scientific notation.
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[PR['PR_LITERAL'],
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/^[+-]?(?:0x[\da-f]+|(?:(?:\.\d+|\d+(?:\.\d*)?)(?:e[+\-]?\d+)?))/i],
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// An identifier
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[PR['PR_PLAIN'], /^[a-z_]\w*/i],
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// A run of punctuation
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[PR['PR_PUNCTUATION'], /^[^\w\t\n\r \xA0][^\w\t\n\r \xA0\"\'\-\+=]*/]
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]),
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['lua']);
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