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-- Copyright 2006-2020 Mitchell mitchell.att.foicica.com. See License.txt.
-- Shell LPeg lexer.
local lexer = require('lexer')
local token, word_match = lexer.token, lexer.word_match
local P, S = lpeg.P, lpeg.S
local lex = lexer.new('bash')
-- Whitespace.
lex:add_rule('whitespace', token(lexer.WHITESPACE, lexer.space^1))
-- Keywords.
lex:add_rule('keyword', token(lexer.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.
lex:add_rule('identifier', token(lexer.IDENTIFIER, lexer.word))
-- Strings.
local sq_str = lexer.range("'", false, false)
local dq_str = lexer.range('"')
local ex_str = lexer.range('`')
local heredoc = '<<' * P(function(input, index)
local _, e, _, delimiter = input:find(
'^%-?(["\']?)([%a_][%w_]*)%1[\n\r\f;]+', index)
if not delimiter then return end
_, e = input:find('[\n\r\f]+' .. delimiter, e)
return e and e + 1 or #input + 1
end)
lex:add_rule('string', token(lexer.STRING, sq_str + dq_str + ex_str + heredoc))
-- Comments.
lex:add_rule('comment', token(lexer.COMMENT, lexer.to_eol('#')))
-- Numbers.
lex:add_rule('number', token(lexer.NUMBER, lexer.number))
-- Variables.
lex:add_rule('variable', token(lexer.VARIABLE, '$' * (
S('!#?*@$') + lexer.digit^1 + lexer.word + lexer.range('{', '}', true)
)))
-- Operators.
lex:add_rule('operator', token(lexer.OPERATOR, S('=!<>+-/*^&|~.,:;?()[]{}')))
-- Fold points.
lex:add_fold_point(lexer.KEYWORD, 'if', 'fi')
lex:add_fold_point(lexer.KEYWORD, 'case', 'esac')
lex:add_fold_point(lexer.KEYWORD, 'do', 'done')
lex:add_fold_point(lexer.OPERATOR, '{', '}')
lex:add_fold_point(lexer.COMMENT, lexer.fold_consecutive_lines('#'))
return lex
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