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# frozen_string_literal: true
module HtmlEscapedHelpers
extend self
# Checks if +content+ contains HTML escaped tags and returns its match.
#
# It matches escaped opening and closing tags `<<name>` and
# `</<name>`. The match is discarded if the tag is inside a quoted
# attribute value.
# Foor example, `<div title="We allow # <b>bold</b>">`.
#
# @return [MatchData, nil] Returns the match or +nil+ if no match was found.
def match_html_escaped_tags(content)
match_data = %r{<\s*(?:/\s*)?\w+}.match(content)
return unless match_data
# Escaped HTML tags are allowed inside quoted attribute values like:
# `title="Press <back>"`
return if %r{=\s*["'][^>]*\z}.match?(match_data.pre_match)
match_data
end
end
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