77 lines
2.3 KiB
Crystal
77 lines
2.3 KiB
Crystal
struct RangeWithMarkup
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getter range : Range(Int32, Int32)
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getter markups : Array(PostResponse::Markup)
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def initialize(@range : Range, @markups : Array(PostResponse::Markup))
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end
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end
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class MarkupConverter
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include Nodes
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getter markups : Array(PostResponse::Markup)
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getter text : Slice(UInt16)
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def self.convert(text : String?, markups : Array(PostResponse::Markup))
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new(text, markups).convert
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end
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def initialize(text : String?, @markups : Array(PostResponse::Markup))
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@text = (text || "").to_utf16
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end
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def convert : Array(Child)
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ranges.flat_map do |range_with_markups|
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text_to_wrap = String.from_utf16(text[range_with_markups.range])
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wrap_in_markups(text_to_wrap, range_with_markups.markups)
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end
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end
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private def ranges
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markup_boundaries = markups.flat_map { |markup| [markup.start, markup.end] }
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bookended_markup_boundaries = ([0] + markup_boundaries + [text.size]).uniq.sort
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bookended_markup_boundaries.each_cons(2).map do |boundaries|
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range = (boundaries[0]...boundaries[1])
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covered_markups = markups.select do |markup|
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range.covers?(markup.start) || range.covers?(markup.end - 1)
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end
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RangeWithMarkup.new(range, covered_markups)
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end.to_a
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end
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def wrap_in_markups(
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child : String | Child,
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markups : Array(PostResponse::Markup)
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) : Array(Child)
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if child.is_a?(String)
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child = Text.new(child)
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end
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if markups.first?.nil?
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return [child] of Child
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end
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marked_up = markup_node_in_container(child, markups[0])
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wrap_in_markups(marked_up, markups[1..])
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end
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private def markup_node_in_container(child : Child, markup : PostResponse::Markup)
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case markup.type
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when PostResponse::MarkupType::A
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if href = markup.href
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Anchor.new(href: href, children: [child] of Child)
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elsif user_id = markup.userId
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UserAnchor.new(user_id: user_id, children: [child] of Child)
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else
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Empty.new
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end
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when PostResponse::MarkupType::CODE
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Code.new(children: [child] of Child)
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when PostResponse::MarkupType::EM
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Emphasis.new(children: [child] of Child)
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when PostResponse::MarkupType::STRONG
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Strong.new(children: [child] of Child)
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else
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Code.new(children: [child] of Child)
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end
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end
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end
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