rc.lua (1568B)
- -- Copyright 2017-2024 Michael Forney. See LICENSE.
- -- rc 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('rc')
- -- Whitespace.
- lex:add_rule('whitespace', token(lexer.WHITESPACE, lexer.space^1))
- -- Keywords.
- lex:add_rule('keyword', token(lexer.KEYWORD, word_match{
- 'for', 'in', 'while', 'if', 'not', 'switch', 'case', 'fn', 'builtin', 'cd', 'eval', 'exec',
- 'exit', 'flag', 'rfork', 'shift', 'ulimit', 'umask', 'wait', 'whatis', '.', '~'
- }))
- -- Identifiers.
- lex:add_rule('identifier', token(lexer.IDENTIFIER, lexer.word))
- -- Strings.
- local str = lexer.range("'", false, false)
- local heredoc = '<<' * P(function(input, index)
- local s, e, _, delimiter = input:find('[ \t]*(["\']?)([%w!"%%+,-./:?@_~]+)%1', index)
- if s == index and delimiter then
- delimiter = delimiter:gsub('[%%+-.?]', '%%%1')
- e = select(2, input:find('[\n\r]' .. delimiter .. '[\n\r]', e))
- return e and e + 1 or #input + 1
- end
- end)
- lex:add_rule('string', token(lexer.STRING, 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('"#')^-1 * ('*' + lexer.digit^1 + lexer.word)))
- -- Operators.
- lex:add_rule('operator', token(lexer.OPERATOR, S('@`=!<>*&^|;?()[]{}') + '\\\n'))
- -- Fold points.
- lex:add_fold_point(lexer.OPERATOR, '{', '}')
- lexer.property['scintillua.comment'] = '#'
- return lex