tcl.lua (1467B)
- -- Copyright 2014-2024 Joshua Krämer. See LICENSE.
- -- Tcl LPeg lexer.
- -- This lexer follows the TCL dodekalogue (http://wiki.tcl.tk/10259).
- -- It is based on the previous lexer by Mitchell.
- local lexer = require('lexer')
- local token, word_match = lexer.token, lexer.word_match
- local P, S = lpeg.P, lpeg.S
- local lex = lexer.new('tcl')
- -- Whitespace.
- lex:add_rule('whitespace', token(lexer.WHITESPACE, lexer.space^1))
- -- Comment.
- lex:add_rule('comment', token(lexer.COMMENT, lexer.to_eol('#' * P(function(input, index)
- local i = index - 2
- while i > 0 and input:find('^[ \t]', i) do i = i - 1 end
- if i < 1 or input:find('^[\r\n;]', i) then return true end
- end))))
- -- Separator (semicolon).
- lex:add_rule('separator', token(lexer.CLASS, ';'))
- -- Argument expander.
- lex:add_rule('expander', token(lexer.LABEL, '{*}'))
- -- Delimiters.
- lex:add_rule('braces', token(lexer.KEYWORD, S('{}')))
- lex:add_rule('quotes', token(lexer.FUNCTION, '"'))
- lex:add_rule('brackets', token(lexer.VARIABLE, S('[]')))
- -- Variable substitution.
- lex:add_rule('variable', token(lexer.STRING, '$' * (lexer.alnum + '_' + P(':')^2)^0))
- -- Backslash substitution.
- local oct = lexer.digit * lexer.digit^-2
- local hex = 'x' * lexer.xdigit^1
- local unicode = 'u' * lexer.xdigit * lexer.xdigit^-3
- lex:add_rule('backslash', token(lexer.TYPE, '\\' * (oct + hex + unicode + 1)))
- -- Fold points.
- lex:add_fold_point(lexer.KEYWORD, '{', '}')
- lexer.property['scintillua.comment'] = '#'
- return lex