class Bridgetown::Tags::HighlightBlock
Constants
- LEADING_OR_TRAILING_LINE_TERMINATORS
- OPTIONS_REGEX
- SYNTAX
The regular expression syntax checker. Start with the language specifier. Follow that by zero or more space separated options that take one of three forms: name, name=value, or name=“<quoted list>”
<quoted list> is a space-separated list of numbers
Public Class Methods
new(tag_name, markup, tokens)
click to toggle source
Calls superclass method
# File lib/bridgetown-core/tags/highlight.rb, line 15 def initialize(tag_name, markup, tokens) super if markup.strip =~ SYNTAX @lang = Regexp.last_match(1).downcase @highlight_options = parse_options(Regexp.last_match(2)) else raise SyntaxError, <<~MSG Syntax Error in tag 'highlight' while parsing the following markup: #{markup} Valid syntax: highlight <lang> [linenos] MSG end end
Public Instance Methods
render(context)
click to toggle source
Calls superclass method
# File lib/bridgetown-core/tags/highlight.rb, line 33 def render(context) prefix = context["highlighter_prefix"] || "" suffix = context["highlighter_suffix"] || "" code = super.to_s.gsub(LEADING_OR_TRAILING_LINE_TERMINATORS, "") output = case context.registers[:site].config.highlighter when "rouge" render_rouge(code) else h(code).strip end rendered_output = add_code_tag(output) prefix + rendered_output + suffix end
Private Instance Methods
add_code_tag(code)
click to toggle source
# File lib/bridgetown-core/tags/highlight.rb, line 86 def add_code_tag(code) code_attributes = [ "class=\"language-#{@lang.to_s.tr("+", "-")}\"", "data-lang=\"#{@lang}\"", ].join(" ") "<figure class=\"highlight\"><pre><code #{code_attributes}>"\ "#{code.chomp}</code></pre></figure>" end
parse_options(input)
click to toggle source
# File lib/bridgetown-core/tags/highlight.rb, line 54 def parse_options(input) options = {} return options if input.empty? # Split along 3 possible forms -- key="<quoted list>", key=value, or key input.scan(OPTIONS_REGEX) do |opt| key, value = opt.split("=") # If a quoted list, convert to array if value&.include?('"') value.delete!('"') value = value.split end options[key.to_sym] = value || true end options[:linenos] = "inline" if options[:linenos] == true options end
render_rouge(code)
click to toggle source
# File lib/bridgetown-core/tags/highlight.rb, line 73 def render_rouge(code) require "rouge" formatter = ::Rouge::Formatters::HTMLLegacy.new( line_numbers: @highlight_options[:linenos], wrap: false, css_class: "highlight", gutter_class: "gutter", code_class: "code" ) lexer = ::Rouge::Lexer.find_fancy(@lang, code) || Rouge::Lexers::PlainText formatter.format(lexer.lex(code)) end