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require 'pygments'
require 'fileutils'
require 'digest/md5'
module Octopress
module Pygments
def self.render_pygments(code, lang)
highlighted_code = ::Pygments.highlight(code, :lexer => lang, :formatter => 'html', :options => {:encoding => 'utf-8'})
highlighted_code = highlighted_code.gsub(/{{/, '{{').gsub(/{%/, '{%')
highlighted_code.to_s
end
def self.highlight(code, options = {})
lang = options[:lang]
lang = 'ruby' if lang == 'ru'
lang = 'objc' if lang == 'm'
lang = 'perl' if lang == 'pl'
lang = 'yaml' if lang == 'yml'
lang = 'coffeescript' if lang == 'coffee'
lang = 'csharp' if lang == 'cs'
lang = 'plain' if lang == '' or lang.nil? or !lang
options[:lang] = lang
options[:title] ||= ' ' if options[:url]
options[:no_cache] = true
# Attempt to retrieve cached code
cache = nil
unless options[:no_cache]
path = options[:cache_path] || get_cache_path(PYGMENTS_CACHE_DIR, options[:lang], options.to_s + code)
cache = read_cache(path)
end
unless cache
if options[:lang] == 'plain'
# Escape html tags
code = code.gsub('<','<')
else
code = render_pygments(code, options[:lang]).match(/<pre>(.+)<\/pre>/m)[1].gsub(/ *$/, '') #strip out divs <div class="highlight">
end
code = tableize_code(code, options[:lang], {linenos: options[:linenos], start: options[:start], marks: options[:marks]})
code = "<figure class='code'>#{code}</figure>"
File.open(path, 'w') {|f| f.print(code) } unless options[:no_cache]
end
cache || code
end
def self.read_cache (path)
File.exist?(path) ? File.read(path) : nil unless path.nil?
end
def self.get_cache_path (dir, name, str)
File.join(dir, "#{name}-#{Digest::MD5.hexdigest(str)}.html")
end
def self.captionize (caption, url, link_text)
figcaption = "<figcaption>#{caption}"
figcaption += "<a href='#{url}'>#{(link_text || 'link').strip}</a>" if url
figcaption += "</figcaption>"
end
def self.tableize_code (code, lang, options = {})
start = options[:start] || 1
lines = options[:linenos] || true
marks = options[:marks] || []
table = "<div class='highlight'><table><tr>"
if lines == true
table += number_lines(start, code.lines.count, marks) if lines
end
table += "<td class='main #{'unnumbered' unless lines} #{lang}'><pre>"
code.lines.each_with_index do |line,index|
classes = 'line'
if marks.include? index + start
classes += ' bg-warning'
classes += ' start' unless marks.include? index - 1 + start
classes += ' end' unless marks.include? index + 1 + start
end
line = line.strip.empty? ? ' ' : line
table += "<div class='#{classes}'>#{line}</div>"
end
table +="</pre></td></tr></table></div>"
end
def self.number_lines (start, count, marks)
start ||= 1
lines = "<td class='line-numbers' aria-hidden='true'><pre>"
count.times do |index|
classes = 'line-number'
if marks.include? index + start
classes += ' marked'
classes += ' start' unless marks.include? index - 1 + start
classes += ' end' unless marks.include? index + 1 + start
end
lines += "<div data-line='#{index + start}' class='#{classes}'></div>"
end
lines += "</pre></td>"
end
def self.parse_markup (input, defaults={})
lang = input.match(/\s*lang:\s*(\S+)/i)
lang = (lang.nil? ? nil : lang[1])
url = input.match(/\s*url:\s*(("(.+?)")|('(.+?)')|(\S+))/i)
url = (url.nil? ? nil : url[3] || url[5] || url[6])
title = input.match(/\s*title:\s*(("(.+?)")|('(.+?)')|(\S+))/i)
title = (title.nil? ? nil : title[3] || title[5] || title[6])
title ||= ' ' if url
linenos = input.match(/\s*linenos:\s*(\w+)/i)
linenos = (linenos.nil? ? nil : linenos[1])
marks = get_marks(input)
link_text = input.match(/\s*link[-_]text:\s*(("(.+?)")|('(.+?)')|(\S+))/i)
link_text = (link_text.nil? ? 'link' : link_text[3] || link_text[5] || link_text[6])
start = input.match(/\s*start:\s*(\d+)/i)
start = (start.nil? ? nil : start[1].to_i)
endline = input.match(/\s*end:\s*(\d+)/i)
endline = (endline.nil? ? nil : endline[1].to_i)
if input =~ / *range:(\d+)-(\d+)/i
start = $1.to_i
endline = $2.to_i
end
options = {
lang: lang,
url: url,
title: title,
linenos: linenos,
marks: marks,
link_text: link_text,
start: start,
end: endline
}
#defaults.each { |k,v| options[k] ||= defaults[k] }
options.each { |k,v| options[k] ||= defaults[k] }
end
def self.clean_markup (input)
input.sub(/\s*lang:\s*\S+/i,''
).sub(/\s*title:\s*(("(.+?)")|('(.+?)')|(\S+))/i,''
).sub(/\s*url:\s*(\S+)/i,''
).sub(/\s*link_text:\s*(("(.+?)")|('(.+?)')|(\S+))/i,''
).sub(/\s*mark:\s*\d\S*/i,''
).sub(/\s*linenos:\s*\w+/i,''
).sub(/\s*start:\s*\d+/i,''
).sub(/\s*end:\s*\d+/i,''
).sub(/\s*range:\s*\d+-\d+/i,'')
end
def self.get_marks (input)
# Matches pattern for line marks and returns array of line numbers to mark
# Example input mark:1,5-10,2
# Outputs: [1,2,5,6,7,8,9,10]
marks = []
if input =~ / *mark:(\d\S*)/i
marks = $1.gsub /(\d+)-(\d+)/ do
($1.to_i..$2.to_i).to_a.join(',')
end
marks = marks.split(',').collect {|s| s.to_i}.sort
end
marks
end
def self.get_range (code, start, endline)
length = code.lines.count
start ||= 1
endline ||= length
if start > 1 or endline < length
raise "#{filepath} is #{length} lines long, cannot begin at line #{start}" if start > length
raise "#{filepath} is #{length} lines long, cannot read beyond line #{endline}" if endline > length
code = code.split(/\n/).slice(start - 1, endline + 1 - start).join("\n")
end
code
end
def self.highlight_failed(error, syntax, markup, code, file = nil)
code_snippet = code.split("\n")[0..9].map{|l| " #{l}" }.join("\n")
fail_message = "\nPygments Error while parsing the following markup#{" in #{file}" if file}:\n\n".red
fail_message += " #{markup}\n#{code_snippet}\n"
fail_message += "#{" ..." if code.split("\n").size > 10}\n"
fail_message += "\nValid Syntax:\n\n#{syntax}\n".yellow
fail_message += "\nPygments Error:\n\n#{error.message}".red
$stderr.puts fail_message.chomp
raise ArgumentError
end
end
end
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