147 lines
4.6 KiB
Ruby
147 lines
4.6 KiB
Ruby
# frozen_string_literal: true
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require_relative 'frame_buffer'
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module BBS
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# Markdown → ANSI line array renderer.
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#
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# BBS::Markdown.to_lines(text, width:, theme:)
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#
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# Returns an array of strings (one per terminal line) with embedded ANSI SGR
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# codes — suitable for BBS::Widgets::ScrollView. Each inline span ends with
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# the theme :text SGR so that trailing text keeps the right background.
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module Markdown
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module_function
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def to_lines(text, width:, theme:)
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styles = {
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base: theme[:text],
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h1: theme[:text_bright],
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h2: theme[:accent],
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h3: theme[:label],
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bold: theme[:text_bright],
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italic: theme[:text_dim],
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code: theme[:label],
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link: theme[:accent],
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quote: theme[:text_dim],
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bullet: theme[:accent],
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rule: theme[:label],
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}
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result = []
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paragraph = []
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in_code = false
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base = styles[:base]
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flush_paragraph = lambda do
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next if paragraph.empty?
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joined = paragraph.join(' ').gsub(/\s+/, ' ').strip
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FrameBuffer.wrap_ansi(inline(joined, styles, base), width).each { |l| result << l }
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paragraph.clear
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end
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text.to_s.split(/\r?\n/).each do |line|
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if line.lstrip.start_with?('```')
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flush_paragraph.call
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in_code = !in_code
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next
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end
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if in_code
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flush_paragraph.call
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clipped = FrameBuffer.clip_ansi(line, width)
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result << "#{styles[:code]}#{clipped}#{base}"
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next
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end
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if line.strip.empty?
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flush_paragraph.call
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result << ''
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next
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end
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if (m = line.match(/\A([#]{1,6})\s+(.+?)\s*#*\s*\z/))
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level = m[1].length
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heading = m[2].strip
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flush_paragraph.call
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style = level == 1 ? styles[:h1] : (level == 2 ? styles[:h2] : styles[:h3])
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FrameBuffer.wrap_ansi(inline(heading, styles, base), width).each do |l|
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result << "#{style}#{l}#{base}"
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end
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next
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end
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if line.match?(/\A\s*([-*_])\1{2,}\s*\z/)
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flush_paragraph.call
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result << "#{styles[:rule]}#{'─' * width}#{base}"
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next
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end
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if (m = line.match(/\A\s*>\s?(.*)/))
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content = m[1]
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flush_paragraph.call
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inner_w = [width - 2, 1].max
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FrameBuffer.wrap_ansi(inline(content, styles, base), inner_w).each do |l|
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result << "#{styles[:quote]}│ #{base}#{l}"
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end
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next
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end
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if (m = line.match(/\A(\s*)[-*+]\s+(.+)/))
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indent = m[1].length
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body = m[2]
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flush_paragraph.call
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prefix_w = indent + 2
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inner_w = [width - prefix_w, 1].max
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wrapped = FrameBuffer.wrap_ansi(inline(body, styles, base), inner_w)
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wrapped.each_with_index do |l, i|
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pad = ' ' * indent
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result << if i.zero?
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"#{pad}#{styles[:bullet]}•#{base} #{l}"
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else
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"#{' ' * prefix_w}#{l}"
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end
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end
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next
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end
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if (m = line.match(/\A(\s*)(\d+)\.\s+(.+)/))
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indent = m[1].length
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num = m[2]
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body = m[3]
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flush_paragraph.call
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prefix = "#{' ' * indent}#{num}. "
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inner_w = [width - prefix.length, 1].max
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wrapped = FrameBuffer.wrap_ansi(inline(body, styles, base), inner_w)
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wrapped.each_with_index do |l, i|
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result << if i.zero?
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"#{' ' * indent}#{styles[:bullet]}#{num}.#{base} #{l}"
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else
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"#{' ' * prefix.length}#{l}"
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end
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end
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next
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end
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paragraph << line.strip
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end
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flush_paragraph.call
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result
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end
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def inline(text, styles, base_sgr)
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s = text.to_s
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s = s.gsub(/\[([^\]]+)\]\(([^)]+)\)/) { "#{styles[:link]}#{::Regexp.last_match(1)}#{base_sgr}" }
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s = s.gsub(/`([^`]+)`/) { "#{styles[:code]}#{::Regexp.last_match(1)}#{base_sgr}" }
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s = s.gsub(/\*\*([^*]+)\*\*/) { "#{styles[:bold]}#{::Regexp.last_match(1)}#{base_sgr}" }
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s = s.gsub(/(?<![A-Za-z0-9*])\*([^*\s][^*]*?[^*\s]|\S)\*(?![A-Za-z0-9*])/) do
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"#{styles[:italic]}#{::Regexp.last_match(1)}#{base_sgr}"
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end
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s = s.gsub(/(?<![A-Za-z0-9_])_([^_\s][^_]*?[^_\s]|\S)_(?![A-Za-z0-9_])/) do
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"#{styles[:italic]}#{::Regexp.last_match(1)}#{base_sgr}"
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end
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s.gsub(/\\([\\`*_{}\[\]()#+\-.!>])/) { ::Regexp.last_match(1) }
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end
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end
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end
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