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# frozen_string_literal: true
module Gitlab
module FrontMatter
DELIM_LANG = {
'---' => 'yaml',
'+++' => 'toml',
';;;' => 'json'
}.freeze
DELIM_UNTRUSTED = "(?:#{Gitlab::FrontMatter::DELIM_LANG.keys.map { |x| RE2::Regexp.escape(x) }.join('|')})".freeze
# Original pattern:
# \A(?<encoding>[^\r\n]*coding:[^\r\n]*\R)? # optional encoding line
# (?<before>\s*)
# ^(?<delim>#{DELIM})[ \t]*(?<lang>\S*)\R # opening front matter marker (optional language specifier)
# (?<front_matter>.*?) # front matter block content (not greedy)
# ^(\k<delim> | \.{3}) # closing front matter marker
# [^\S\r\n]*(\R|\z)
# rubocop:disable Style/StringConcatenation
# rubocop:disable Style/LineEndConcatenation
PATTERN_UNTRUSTED =
# optional encoding line
"\\A(?P<encoding>[^\\r\\n]*coding:[^\\r\\n]*#{::Gitlab::UntrustedRegexp::BACKSLASH_R})?" +
'(?P<before>\s*)' +
# opening front matter marker (optional language specifier)
"^(?P<delim>#{DELIM_UNTRUSTED})[ \\t]*(?P<lang>\\S*)#{::Gitlab::UntrustedRegexp::BACKSLASH_R}" +
# front matter block content (not greedy)
'(?P<front_matter>(?:\n|.)*?)' +
# closing front matter marker
"^((?P<delim_closing>#{DELIM_UNTRUSTED})|\\.{3})" +
"[^\\S\\r\\n]*(#{::Gitlab::UntrustedRegexp::BACKSLASH_R}|\\z)"
# rubocop:enable Style/LineEndConcatenation
# rubocop:enable Style/StringConcatenation
PATTERN_UNTRUSTED_REGEX =
Gitlab::UntrustedRegexp.new(PATTERN_UNTRUSTED, multiline: true).freeze
end
end
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