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-- Copyright 2016 Alejandro Baez (https://keybase.io/baez). See LICENSE.
-- Dockerfile LPeg lexer.
local l = require('lexer')
local token, word_match = l.token, l.word_match
local P, R, S = lpeg.P, lpeg.R, lpeg.S
local M = {_NAME = 'dockerfile'}
-- Whitespace
local indent = #l.starts_line(S(' \t')) *
(token(l.WHITESPACE, ' ') + token('indent_error', '\t'))^1
local ws = token(l.WHITESPACE, S(' \t')^1 + l.newline^1)
-- Comments.
local comment = token(l.COMMENT, '#' * l.nonnewline^0)
-- Strings.
local sq_str = l.delimited_range("'", false, true)
local dq_str = l.delimited_range('"')
local string = token(l.STRING, sq_str + dq_str)
-- Numbers.
local number = token(l.NUMBER, l.float + l.integer)
-- Keywords.
local keyword = token(l.KEYWORD, word_match{
'ADD', 'ARG', 'CMD', 'COPY', 'ENTRYPOINT', 'ENV', 'EXPOSE', 'FROM', 'LABEL',
'MAINTAINER', 'ONBUILD', 'RUN', 'STOPSIGNAL', 'USER', 'VOLUME', 'WORKDIR'
})
-- Identifiers.
local identifier = token(l.IDENTIFIER, l.word)
-- Variable.
local variable = token(l.VARIABLE,
S('$')^1 * (S('{')^1 * l.word * S('}')^1 + l.word))
-- Operators.
local operator = token(l.OPERATOR, S('\\[],=:{}'))
M._rules = {
{'whitespace', ws},
{'keyword', keyword},
{'variable', variable},
{'identifier', identifier},
{'string', string},
{'comment', comment},
{'number', number},
{'operator', operator},
}
M._FOLDBYINDENTATION = true
return M
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