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-- Copyright 2006-2017 Mitchell mitchell.att.foicica.com. See LICENSE.
-- Shell LPeg lexer.
local l = require('lexer')
local token, word_match = l.token, l.word_match
local P, R, S = lpeg.P, lpeg.R, lpeg.S
local M = {_NAME = 'bash'}
-- Whitespace.
local ws = token(l.WHITESPACE, l.space^1)
-- Comments.
local comment = token(l.COMMENT, '#' * l.nonnewline^0)
-- Strings.
local sq_str = l.delimited_range("'", false, true)
local dq_str = l.delimited_range('"')
local ex_str = l.delimited_range('`')
local heredoc = '<<' * P(function(input, index)
local s, e, _, delimiter =
input:find('%-?(["\']?)([%a_][%w_]*)%1[\n\r\f;]+', index)
if s == index and delimiter then
local _, e = input:find('[\n\r\f]+'..delimiter, e)
return e and e + 1 or #input + 1
end
end)
local string = token(l.STRING, sq_str + dq_str + ex_str + heredoc)
-- Numbers.
local number = token(l.NUMBER, l.float + l.integer)
-- Keywords.
local keyword = token(l.KEYWORD, word_match({
'if', 'then', 'elif', 'else', 'fi', 'case', 'in', 'esac', 'while', 'for',
'do', 'done', 'continue', 'local', 'return', 'select',
-- Operators.
'-a', '-b', '-c', '-d', '-e', '-f', '-g', '-h', '-k', '-p', '-r', '-s', '-t',
'-u', '-w', '-x', '-O', '-G', '-L', '-S', '-N', '-nt', '-ot', '-ef', '-o',
'-z', '-n', '-eq', '-ne', '-lt', '-le', '-gt', '-ge'
}, '-'))
-- Identifiers.
local identifier = token(l.IDENTIFIER, l.word)
-- Variables.
local variable = token(l.VARIABLE,
'$' * (S('!#?*@$') + l.digit^1 + l.word +
l.delimited_range('{}', true, true, true)))
-- Operators.
local operator = token(l.OPERATOR, S('=!<>+-/*^&|~.,:;?()[]{}'))
M._rules = {
{'whitespace', ws},
{'keyword', keyword},
{'identifier', identifier},
{'string', string},
{'comment', comment},
{'number', number},
{'variable', variable},
{'operator', operator},
}
M._foldsymbols = {
_patterns = {'[a-z]+', '[{}]', '#'},
[l.KEYWORD] = {
['if'] = 1, fi = -1, case = 1, esac = -1, ['do'] = 1, done = -1
},
[l.OPERATOR] = {['{'] = 1, ['}'] = -1},
[l.COMMENT] = {['#'] = l.fold_line_comments('#')}
}
return M
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