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-- Copyright 2016-2020 Alejandro Baez (https://keybase.io/baez). See License.txt.
-- Dockerfile 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('dockerfile', {fold_by_indentation = true})
-- Whitespace
lex:add_rule('whitespace', token(lexer.WHITESPACE, lexer.space^1))
-- Keywords.
lex:add_rule('keyword', token(lexer.KEYWORD, word_match[[
ADD ARG CMD COPY ENTRYPOINT ENV EXPOSE FROM LABEL MAINTAINER ONBUILD RUN
STOPSIGNAL USER VOLUME WORKDIR
]]))
-- Identifiers.
lex:add_rule('identifier', token(lexer.IDENTIFIER, lexer.word))
-- Variable.
lex:add_rule('variable', token(lexer.VARIABLE, S('$')^1 *
(S('{')^1 * lexer.word * S('}')^1 + lexer.word)))
-- Strings.
local sq_str = lexer.range("'", false, false)
local dq_str = lexer.range('"')
lex:add_rule('string', token(lexer.STRING, sq_str + dq_str))
-- Comments.
lex:add_rule('comment', token(lexer.COMMENT, lexer.to_eol('#')))
-- Numbers.
lex:add_rule('number', token(lexer.NUMBER, lexer.number))
-- Operators.
lex:add_rule('operator', token(lexer.OPERATOR, S('\\[],=:{}')))
return lex
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