61 lines
1.9 KiB
Lua
Executable File
61 lines
1.9 KiB
Lua
Executable File
-- Copyright 2006-2019 Mitchell mitchell.att.foicica.com. See License.txt.
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-- Shell LPeg lexer.
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local lexer = require('lexer')
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local token, word_match = lexer.token, lexer.word_match
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local P, R, S = lpeg.P, lpeg.R, lpeg.S
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local lex = lexer.new('bash')
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-- Whitespace.
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lex:add_rule('whitespace', token(lexer.WHITESPACE, lexer.space^1))
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-- Keywords.
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lex:add_rule('keyword', token(lexer.KEYWORD, word_match[[
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if then elif else fi case in esac while for do done continue local return
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select
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-- Operators.
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-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
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-z -n -eq -ne -lt -le -gt -ge
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]]))
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-- Identifiers.
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lex:add_rule('identifier', token(lexer.IDENTIFIER, lexer.word))
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-- Strings.
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local sq_str = lexer.delimited_range("'", false, true)
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local dq_str = lexer.delimited_range('"')
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local ex_str = lexer.delimited_range('`')
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local heredoc = '<<' * P(function(input, index)
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local s, e, _, delimiter =
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input:find('%-?(["\']?)([%a_][%w_]*)%1[\n\r\f;]+', index)
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if s == index and delimiter then
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local _, e = input:find('[\n\r\f]+'..delimiter, e)
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return e and e + 1 or #input + 1
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end
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end)
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lex:add_rule('string', token(lexer.STRING, sq_str + dq_str + ex_str + heredoc))
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-- Comments.
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lex:add_rule('comment', token(lexer.COMMENT, '#' * lexer.nonnewline^0))
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-- Numbers.
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lex:add_rule('number', token(lexer.NUMBER, lexer.float + lexer.integer))
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-- Variables.
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lex:add_rule('variable', token(lexer.VARIABLE,
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'$' * (S('!#?*@$') + lexer.digit^1 + lexer.word +
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lexer.delimited_range('{}', true, true))))
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-- Operators.
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lex:add_rule('operator', token(lexer.OPERATOR, S('=!<>+-/*^&|~.,:;?()[]{}')))
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-- Fold points.
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lex:add_fold_point(lexer.KEYWORD, 'if', 'fi')
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lex:add_fold_point(lexer.KEYWORD, 'case', 'esac')
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lex:add_fold_point(lexer.KEYWORD, 'do', 'done')
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lex:add_fold_point(lexer.OPERATOR, '{', '}')
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lex:add_fold_point(lexer.COMMENT, '#', lexer.fold_line_comments('#'))
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return lex
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