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Contents
require "rouge" require "htmlentities" module Lookbook class CodeHighlighter < Service attr_reader :source def initialize(source, opts = {}) @source = source.to_s @opts = opts end def opts (@opts.is_a?(String) || @opts.is_a?(Symbol)) ? {language: @opts} : @opts.to_h end def call coder = HTMLEntities.new decoded_source = coder.decode(source) language = opts.fetch(:language, "ruby") formatter = LookbookFormatter.new(language: language, **opts) lexer = Rouge::Lexer.find(language.to_s) || Rouge::Lexer.find("plaintext") formatter.format(lexer.lex(decoded_source)).html_safe end class LookbookFormatter < Rouge::Formatters::HTML def initialize(**opts) @opts = opts @highlight_lines = opts[:highlight_lines].to_a || [] @start_line = opts[:start_line] || 1 @language = opts[:language] end def stream(tokens, &block) lines = token_lines(tokens) yield "<div class='wrapper'>" if @opts[:line_numbers] yield "<div class='line-numbers'>" lines.each.with_index do |line, i| yield "<div class='line #{"highlighted" if highlighted?(i)}'><span class='line-number'>#{line_number(i)}</span></div>" end yield "</div>" end yield "<pre class='code highlight' data-lang='#{@language}'><code>" lines.each.with_index do |line_tokens, i| yield "<div class='line#{" highlighted" if highlighted?(i)}'>" line_tokens.each do |token, value| yield span(token, value) end yield "</div>" end yield "</code></pre>" yield "</div>" end def highlighted?(i) @highlight_lines.include?(i + 1) end def line_number(i) @start_line + i end end end end
Version data entries
42 entries across 42 versions & 1 rubygems