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module ReverseMarkdown
class Cleaner
def tidy(string)
result = remove_inner_whitespaces(string)
result = remove_newlines(result)
result = remove_leading_newlines(result)
result = clean_tag_borders(result)
clean_punctuation_characters(result)
end
def remove_newlines(string)
string.gsub(/\n{3,}/, "\n\n")
end
def remove_leading_newlines(string)
string.gsub(/\A\n+/, '')
end
def remove_inner_whitespaces(string)
string.each_line.inject("") do |memo, line|
memo + preserve_border_whitespaces(line) do
line.strip.gsub(/[ \t]{2,}/, ' ')
end
end
end
# Find non-asterisk content that is enclosed by two or
# more asterisks. Ensure that only one whitespace occurs
# in the border area.
# Same for underscores and brackets.
def clean_tag_borders(string)
result = string.gsub(/\s?\*{2,}.*?\*{2,}\s?/) do |match|
preserve_border_whitespaces(match, default_border: ReverseMarkdown.config.tag_border) do
match.strip.sub('** ', '**').sub(' **', '**')
end
end
result = result.gsub(/\s?\_{2,}.*?\_{2,}\s?/) do |match|
preserve_border_whitespaces(match, default_border: ReverseMarkdown.config.tag_border) do
match.strip.sub('__ ', '__').sub(' __', '__')
end
end
result = result.gsub(/\s?~{2,}.*?~{2,}\s?/) do |match|
preserve_border_whitespaces(match, default_border: ReverseMarkdown.config.tag_border) do
match.strip.sub('~~ ', '~~').sub(' ~~', '~~')
end
end
result.gsub(/\s?\[.*?\]\s?/) do |match|
preserve_border_whitespaces(match) do
match.strip.sub('[ ', '[').sub(' ]', ']')
end
end
end
def clean_punctuation_characters(string)
string.gsub(/(\*\*|~~|__)\s([\.!\?'"])/, "\\1".strip + "\\2")
end
def force_encoding(string)
ReverseMarkdown.config.force_encoding or return string
string.encode('UTF-8', 'binary', invalid: :replace, undef: :replace, replace: '')
end
private
def preserve_border_whitespaces(string, options = {}, &block)
return string if string =~ /\A\s*\Z/
default_border = options.fetch(:default_border, '')
# If the string contains part of a link so the characters [,],(,)
# then don't add any extra spaces
default_border = '' if string =~ /[\[\(\]\)]/
string_start = present_or_default(string[/\A\s*/], default_border)
string_end = present_or_default(string[/\s*\Z/], default_border)
result = yield
string_start + result + string_end
end
def present_or_default(string, default)
if string.nil? || string.empty?
default
else
string
end
end
end
end
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