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module ReverseMarkdown
module Converters
class Text < Base
def convert(node, options = {})
if node.text.strip.empty?
treat_empty(node)
else
treat_text(node)
end
end
private
INLINE_ELEMENTS = [:a, :abbr, :b, :bdi, :bdo, :cite, :code, :data, :del,
:dfn, :em, :i, :ins, :kbd, :mark, :q, :rp, :rt, :ruby,
:s, :samp, :small, :span, :strong, :sub, :sup, :time,
:u, :var, :wbr, :font, :tt].freeze
def treat_empty(node)
parent = node.parent.name.to_sym
if [:ol, :ul].include?(parent) # Otherwise the identation is broken
''
elsif node.text == ' ' # Regular whitespace text node
' '
elsif INLINE_ELEMENTS.include?(parent) && node.text =~ /\n/
# Preserve newlines between inline elements as space (HTML whitespace collapsing)
' '
else
''
end
end
def treat_text(node)
text = node.text
text = preserve_nbsp(text)
text = remove_border_newlines(text, node)
text = remove_inner_newlines(text)
text = escape_keychars(text)
text = preserve_keychars_within_backticks(text)
text = preserve_tags(text)
text
end
def preserve_nbsp(text)
text.gsub(/\u00A0/, " ")
end
def preserve_tags(text)
text.gsub(/[<>]/, '>' => '\>', '<' => '\<')
end
def remove_border_newlines(text, node)
# Convert leading newlines to space if there's preceding inline content
result = if has_adjacent_inline_content?(node, :previous)
text.gsub(/\A\n+/, ' ')
else
text.gsub(/\A\n+/, '')
end
# Convert trailing newlines to space if there's following inline content
if has_adjacent_inline_content?(node, :next)
result.gsub(/\n+\z/, ' ')
else
result.gsub(/\n+\z/, '')
end
end
def has_adjacent_inline_content?(node, direction)
sibling = direction == :next ? node.next_sibling : node.previous_sibling
while sibling
if sibling.text?
return true unless sibling.text.strip.empty?
elsif INLINE_ELEMENTS.include?(sibling.name.to_sym)
return true
else
return false
end
sibling = direction == :next ? sibling.next_sibling : sibling.previous_sibling
end
parent = node.parent
return false unless INLINE_ELEMENTS.include?(parent.name.to_sym)
has_adjacent_inline_content?(parent, direction)
end
def remove_inner_newlines(text)
text.tr("\r\n\t", ' ').squeeze(' ')
end
def preserve_keychars_within_backticks(text)
text.gsub(/`.*?`/) do |match|
match.gsub('\_', '_').gsub('\*', '*')
end
end
end
register :text, Text.new
end
end
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