// Copyright (C) 2013 Andrew Allen
//
// 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 Erlang.
*
* Derived from https://raw.github.com/erlang/otp/dev/lib/compiler/src/core_parse.yrl
* Modified from Mike Samuel's Haskell plugin for google-code-prettify
*
* @author achew22@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-quoted strings.
[PR['PR_STRING'], /^\"(?:[^\"\\\n\x0C\r]|\\[\s\S])*(?:\"|$)/,
null, '"'],
// Handle atoms
[PR['PR_LITERAL'], /^[a-z][a-zA-Z0-9_]*/],
// Handle single quoted atoms
[PR['PR_LITERAL'], /^\'(?:[^\'\\\n\x0C\r]|\\[^&])+\'?/,
null, "'"],
// Handle macros. Just to be extra clear on this one, it detects the ?
// then uses the regexp to end it so be very careful about matching
// all the terminal elements
[PR['PR_LITERAL'], /^\?[^ \t\n({]+/, 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']
],
[
// TODO: catch @declarations inside comments
// Comments in erlang are started with % and go till a newline
[PR['PR_COMMENT'], /^%[^\n]*/],
// Catch macros
//[PR['PR_TAG'], /?[^( \n)]+/],
/**
* %% Keywords (atoms are assumed to always be single-quoted).
* 'module' 'attributes' 'do' 'let' 'in' 'letrec'
* 'apply' 'call' 'primop'
* 'case' 'of' 'end' 'when' 'fun' 'try' 'catch' 'receive' 'after'
*/
[PR['PR_KEYWORD'], /^(?:module|attributes|do|let|in|letrec|apply|call|primop|case|of|end|when|fun|try|catch|receive|after|char|integer|float,atom,string,var)\b/],
/**
* Catch definitions (usually defined at the top of the file)
* Anything that starts -something
*/
[PR['PR_KEYWORD'], /^-[a-z_]+/],
// Catch variables
[PR['PR_TYPE'], /^[A-Z_][a-zA-Z0-9_]*/],
// matches the symbol production
[PR['PR_PUNCTUATION'], /^[.,;]/]
]),
['erlang', 'erl']);
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