// Copyright (C) 2009 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 Haskell.
*
*
* 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-hs">(my lisp code)</pre>
* The lang-cl class identifies the language as common lisp.
* This file supports the following language extensions:
* lang-cl - Common Lisp
* lang-el - Emacs Lisp
* lang-lisp - Lisp
* lang-scm - Scheme
*
*
* I used http://www.informatik.uni-freiburg.de/~thiemann/haskell/haskell98-report-html/syntax-iso.html
* as the basis, but ignore the way the ncomment production nests since this
* makes the lexical grammar irregular. It might be possible to support
* ncomments using the lookbehind filter.
*
*
* @author mikesamuel@gmail.com
*/
PR.registerLangHandler(
PR.createSimpleLexer(
[
// Whitespace
// whitechar -> newline | vertab | space | tab | uniWhite
// newline -> return linefeed | return | linefeed | formfeed
[PR.PR_PLAIN, /^[\t\n\x0B\x0C\r ]+/, null, '\t\n\x0B\x0C\r '],
// Single line double and single-quoted strings.
// char -> ' (graphic<' | \> | space | escape<\&>) '
// string -> " {graphic<" | \> | space | escape | gap}"
// escape -> \ ( charesc | ascii | decimal | o octal
// | x hexadecimal )
// charesc -> a | b | f | n | r | t | v | \ | " | ' | &
[PR.PR_STRING, /^\"(?:[^\"\\\n\x0C\r]|\\[\s\S])*(?:\"|$)/,
null, '"'],
[PR.PR_STRING, /^\'(?:[^\'\\\n\x0C\r]|\\[^&])\'?/,
null, "'"],
// decimal -> digit{digit}
// octal -> octit{octit}
// hexadecimal -> hexit{hexit}
// integer -> decimal
// | 0o octal | 0O octal
// | 0x hexadecimal | 0X hexadecimal
// float -> decimal . decimal [exponent]
// | decimal exponent
// exponent -> (e | E) [+ | -] decimal
[PR.PR_LITERAL,
/^(?:0o[0-7]+|0x[\da-f]+|\d+(?:\.\d+)?(?:e[+\-]?\d+)?)/i,
null, '0123456789']
],
[
// Haskell does not have a regular lexical grammar due to the nested
// ncomment.
// comment -> dashes [ any<symbol> {any}] newline
// ncomment -> opencom ANYseq {ncomment ANYseq}closecom
// dashes -> '--' {'-'}
// opencom -> '{-'
// closecom -> '-}'
[PR.PR_COMMENT, /^(?:(?:--+(?:[^\r\n\x0C]*)?)|(?:\{-(?:[^-]|-+[^-\}])*-\}))/],
// reservedid -> case | class | data | default | deriving | do
// | else | if | import | in | infix | infixl | infixr
// | instance | let | module | newtype | of | then
// | type | where | _
[PR.PR_KEYWORD, /^(?:case|class|data|default|deriving|do|else|if|import|in|infix|infixl|infixr|instance|let|module|newtype|of|then|type|where|_)(?=[^a-zA-Z0-9\']|$)/, null],
// qvarid -> [ modid . ] varid
// qconid -> [ modid . ] conid
// varid -> (small {small | large | digit | ' })<reservedid>
// conid -> large {small | large | digit | ' }
// modid -> conid
// small -> ascSmall | uniSmall | _
// ascSmall -> a | b | ... | z
// uniSmall -> any Unicode lowercase letter
// large -> ascLarge | uniLarge
// ascLarge -> A | B | ... | Z
// uniLarge -> any uppercase or titlecase Unicode letter
[PR.PR_PLAIN, /^(?:[A-Z][\w\']*\.)*[a-zA-Z][\w\']*/],
// matches the symbol production
[PR.PR_PUNCTUATION, /^[^\t\n\x0B\x0C\r a-zA-Z0-9\'\"]+/]
]),
['hs']);
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