-- Copyright 2016-2018 Alejandro Baez (https://keybase.io/baez). See License.txt.
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-- Dockerfile LPeg lexer.
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local lexer = require('lexer')
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local token, word_match = lexer.token, lexer.word_match
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local P, R, S = lpeg.P, lpeg.R, lpeg.S
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local lex = lexer.new('dockerfile', {fold_by_indentation = true})
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-- Whitespace
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lex:add_rule('whitespace', token(lexer.WHITESPACE, lexer.space^1))
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-- Keywords.
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lex:add_rule('keyword', token(lexer.KEYWORD, word_match[[
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ADD ARG CMD COPY ENTRYPOINT ENV EXPOSE FROM LABEL MAINTAINER ONBUILD RUN
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STOPSIGNAL USER VOLUME WORKDIR
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]]))
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-- Identifiers.
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lex:add_rule('identifier', token(lexer.IDENTIFIER, lexer.word))
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-- Variable.
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lex:add_rule('variable', token(lexer.VARIABLE,
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S('$')^1 * (S('{')^1 * lexer.word * S('}')^1 +
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lexer.word)))
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-- Strings.
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local sq_str = lexer.delimited_range("'", false, true)
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local dq_str = lexer.delimited_range('"')
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lex:add_rule('string', token(lexer.STRING, sq_str + dq_str))
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-- Comments.
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lex:add_rule('comment', token(lexer.COMMENT, '#' * lexer.nonnewline^0))
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-- Numbers.
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lex:add_rule('number', token(lexer.NUMBER, lexer.float + lexer.integer))
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-- Operators.
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lex:add_rule('operator', token(lexer.OPERATOR, S('\\[],=:{}')))
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return lex
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