build: set version to 0.5
[vis.git] / lua / lexers / bash.lua
blob2fa72f27c9ce0772a04cd53755af38060316a961
1 -- Copyright 2006-2017 Mitchell mitchell.att.foicica.com. See LICENSE.
2 -- Shell LPeg lexer.
4 local l = require('lexer')
5 local token, word_match = l.token, l.word_match
6 local P, R, S = lpeg.P, lpeg.R, lpeg.S
8 local M = {_NAME = 'bash'}
10 -- Whitespace.
11 local ws = token(l.WHITESPACE, l.space^1)
13 -- Comments.
14 local comment = token(l.COMMENT, '#' * l.nonnewline^0)
16 -- Strings.
17 local sq_str = l.delimited_range("'", false, true)
18 local dq_str = l.delimited_range('"')
19 local ex_str = l.delimited_range('`')
20 local heredoc = '<<' * P(function(input, index)
21 local s, e, _, delimiter =
22 input:find('%-?(["\']?)([%a_][%w_]*)%1[\n\r\f;]+', index)
23 if s == index and delimiter then
24 local _, e = input:find('[\n\r\f]+'..delimiter, e)
25 return e and e + 1 or #input + 1
26 end
27 end)
28 local string = token(l.STRING, sq_str + dq_str + ex_str + heredoc)
30 -- Numbers.
31 local number = token(l.NUMBER, l.float + l.integer)
33 -- Keywords.
34 local keyword = token(l.KEYWORD, word_match({
35 'if', 'then', 'elif', 'else', 'fi', 'case', 'in', 'esac', 'while', 'for',
36 'do', 'done', 'continue', 'local', 'return', 'select',
37 -- Operators.
38 '-a', '-b', '-c', '-d', '-e', '-f', '-g', '-h', '-k', '-p', '-r', '-s', '-t',
39 '-u', '-w', '-x', '-O', '-G', '-L', '-S', '-N', '-nt', '-ot', '-ef', '-o',
40 '-z', '-n', '-eq', '-ne', '-lt', '-le', '-gt', '-ge'
41 }, '-'))
43 -- Identifiers.
44 local identifier = token(l.IDENTIFIER, l.word)
46 -- Variables.
47 local variable = token(l.VARIABLE,
48 '$' * (S('!#?*@$') + l.digit^1 + l.word +
49 l.delimited_range('{}', true, true, true)))
51 -- Operators.
52 local operator = token(l.OPERATOR, S('=!<>+-/*^&|~.,:;?()[]{}'))
54 M._rules = {
55 {'whitespace', ws},
56 {'keyword', keyword},
57 {'identifier', identifier},
58 {'string', string},
59 {'comment', comment},
60 {'number', number},
61 {'variable', variable},
62 {'operator', operator},
65 M._foldsymbols = {
66 _patterns = {'[a-z]+', '[{}]', '#'},
67 [l.KEYWORD] = {
68 ['if'] = 1, fi = -1, case = 1, esac = -1, ['do'] = 1, done = -1
70 [l.OPERATOR] = {['{'] = 1, ['}'] = -1},
71 [l.COMMENT] = {['#'] = l.fold_line_comments('#')}
74 return M