vis

a vi-like editor based on Plan 9's structural regular expressions
dockerfile.lua

(1416B)
      1 -- Copyright 2016-2025 Alejandro Baez (https://keybase.io/baez). See LICENSE.
      2 -- Dockerfile LPeg lexer.
      3 
      4 local lexer = lexer
      5 local P, S, B = lpeg.P, lpeg.S, lpeg.B
      6 
      7 local lex = lexer.new(..., {fold_by_indentation = true})
      8 
      9 -- Keywords.
     10 local keyword = lex:tag(lexer.KEYWORD, lex:word_match(lexer.KEYWORD))
     11 lex:add_rule('keyword', keyword)
     12 
     13 -- Identifiers.
     14 lex:add_rule('identifier', lex:tag(lexer.IDENTIFIER, lexer.word))
     15 
     16 -- Variable.
     17 lex:add_rule('variable',
     18 -B('\\') * lex:tag(lexer.OPERATOR, '$' * P('{')^-1) * lex:tag(lexer.VARIABLE, lexer.word))
     19 
     20 -- Strings.
     21 local sq_str = lexer.range("'", false, false)
     22 local dq_str = lexer.range('"')
     23 lex:add_rule('string', lex:tag(lexer.STRING, sq_str + dq_str))
     24 
     25 -- Comments.
     26 lex:add_rule('comment', lex:tag(lexer.COMMENT, lexer.to_eol('#')))
     27 
     28 -- Numbers.
     29 lex:add_rule('number', lex:tag(lexer.NUMBER, lexer.number))
     30 
     31 -- Operators.
     32 lex:add_rule('operator', lex:tag(lexer.OPERATOR, S('\\[],=:{}')))
     33 
     34 local bash = lexer.load('bash')
     35 local start_rule = #P('RUN') * keyword * bash:get_rule('whitespace')
     36 local end_rule = -B('\\') * #lexer.newline * lex:get_rule('whitespace')
     37 lex:embed(bash, start_rule, end_rule)
     38 
     39 -- Word lists.
     40 lex:set_word_list(lexer.KEYWORD, {
     41 	'ADD', 'ARG', 'CMD', 'COPY', 'ENTRYPOINT', 'ENV', 'EXPOSE', 'FROM', 'LABEL', 'MAINTAINER',
     42 	'ONBUILD', 'RUN', 'STOPSIGNAL', 'USER', 'VOLUME', 'WORKDIR'
     43 })
     44 
     45 lexer.property['scintillua.comment'] = '#'
     46 
     47 return lex