Added optional Lua lexer support.

This support is disabled by default and must be enabled via compile-time option.

1 files changed, 41 insertions, 0 deletions

diff --git a/lexlua/dockerfile.lua b/lexlua/dockerfile.lua
new file mode 100644
index 000000000..bec2c4341
--- /dev/null
+++ b/lexlua/dockerfile.lua
@@ -0,0 +1,41 @@
+-- Copyright 2016-2018 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, R, S = lpeg.P, lpeg.R, 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.delimited_range("'", false, true)
+local dq_str = lexer.delimited_range('"')
+lex:add_rule('string', token(lexer.STRING, sq_str + dq_str))
+
+-- Comments.
+lex:add_rule('comment', token(lexer.COMMENT, '#' * lexer.nonnewline^0))
+
+-- Numbers.
+lex:add_rule('number', token(lexer.NUMBER, lexer.float + lexer.integer))
+
+-- Operators.
+lex:add_rule('operator', token(lexer.OPERATOR, S('\\[],=:{}')))
+
+return lex