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Versions: 45
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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
45 entries across 45 versions & 1 rubygems