Class: Slamdown::Conversion::Normaliser::Breaks

Inherits:
Object
  • Object
show all
Defined in:
lib/slamdown/conversion/normaliser/breaks.rb

Overview

Interprets line-break runs and bubbles recovered paragraph boundaries through inline wrappers without leaking internal sentinels.

Instance Method Summary collapse

Constructor Details

#initialize(node_factory, content, diagnostics) ⇒ Breaks

Returns a new instance of Breaks.



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# File 'lib/slamdown/conversion/normaliser/breaks.rb', line 9

def initialize(node_factory, content, diagnostics)
	@node_factory = node_factory
	@content = content
	@diagnostics = diagnostics
end

Instance Method Details

#line_break?(node) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/slamdown/conversion/normaliser/breaks.rb', line 85

def line_break?(node)
	node.representation == :semantic && node.semantic_kind == :line_break
end

#paragraph_boundary?(node) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/slamdown/conversion/normaliser/breaks.rb', line 89

def paragraph_boundary?(node)
	node.representation == :boundary && node.semantic_kind == :paragraph_boundary
end

#split_break_runs(children) ⇒ Object 



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# File 'lib/slamdown/conversion/normaliser/breaks.rb', line 15

def split_break_runs(children)
	fragments = []
	current = []
	index = 0

	while index < children.length
		if paragraph_boundary?(children[index])
			if @content.visible_content?(current) && @content.visible_content?(children[(index + 1)..-1] || [])
				fragments << current
				current = []
			end
			index += 1
			next
		end

		unless line_break?(children[index])
			current << children[index]
			index += 1
			next
		end

		run_path = children[index].source_path
		break_count = 0
		interstitial = []
		cursor = index
		loop do
			if cursor < children.length && line_break?(children[cursor])
				break_count += 1
				cursor += 1
			elsif cursor < children.length && @content.whitespace_text?(children[cursor]) && next_break_index(children, cursor)
				interstitial << children[cursor]
				cursor += 1
			else
				break
			end
		end

		content_before = @content.visible_content?(current)
		content_after = @content.visible_content?(children[cursor..-1] || [])
		if break_count >= 2
			if content_before && content_after
				fragments << current
				current = []
				@diagnostics.add(:paragraph_break_recovered, :info, "Converted a repeated line-break run to a paragraph boundary", run_path)
			end
		elsif content_before && content_after
			current << children[index]
			current.concat(interstitial)
		end
		index = cursor
	end

	fragments << current if @content.visible_content?(current)
	fragments
end

#split_inline_fragments(children) ⇒ Object 



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# File 'lib/slamdown/conversion/normaliser/breaks.rb', line 79

def split_inline_fragments(children)
	return [children] unless children.any? { |child| line_break?(child) || paragraph_boundary?(child) }

	split_break_runs(children)
end

#wrap_inline_fragments(children, path) ⇒ Object 



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# File 'lib/slamdown/conversion/normaliser/breaks.rb', line 71

def wrap_inline_fragments(children, path)
	fragments = split_inline_fragments(children)
	fragments.each_with_index.each_with_object([]) do |(fragment, index), result|
		result << @node_factory.paragraph_boundary(fragment.first ? fragment.first.source_path : path) if index > 0
		result.concat(yield(fragment))
	end
end