#207 Syntax Highlighting

<% cache do %>   
<%= highlight(:ruby, 'class Test; end') -%>   
<% end %>

require 'rubygems'  
require 'benchmark'  
require 'coderay'  
require 'uv'  

path = __FILE__   
content = File.read(__FILE__)   

# run it once to initialize   
CodeRay.scan("print 'hello'",  'ruby').div(:css => :class)   
Uv.parse("print 'test'", 'xhtml', 'ruby', true, 'amy')   

Benchmark.bm(11) do |b|   
b.report 'coderay' do  
  50.times { CodeRay.scan(content, 'ruby').div(:css => :class) }   
end  

b.report('ultraviolet') do  
  50.times { Uv.parse(content, 'xhtml', 'ruby', true, 'amy') }   
end  

b.report('pygments') do  
  50.times { `pygmentize -f html "#{path}"` }   
end  
end

$ ruby benchmark.rb 
               user     system      total        real
coderay      0.310000   0.010000   0.320000 (  0.312954)
ultraviolet  4.860000   0.020000   4.880000 (  4.886621)
pygments     0.010000   0.120000  12.430000 ( 12.643173)

<code lang="ruby">   
puts "Hello, world!"  
</code>

Rails::Initializer.run do |config|   
config.gem "coderay"  
config.gem "RedCloth"  
end

<% title @article.title %>   
<p class="author">from <%= @article.author %></p>   
<%= coderay(@article.content) %>   
<p>

# Methods added to this helper will be available to all templates in the application.   
module ApplicationHelper     
def coderay(text)   
  text.gsub(/\<code( lang="(.+?)")?\>(.+?)\<\/code\>/m) do  
    CodeRay.scan($3, $2).div(:css => :class)   
  end  
end  
end

.CodeRay {   
background-color: #232323;   
border: 1px solid black;   
font-family: 'Courier New', 'Terminal', monospace;   
color: #E6E0DB;   
padding: 3px 5px;   
overflow: auto;   
font-size: 12px;   
margin: 12px 0;   
}   
.CodeRay pre {   
margin: 0px;   
padding: 0px;   
}   

.CodeRay .an { color:#E7BE69 }                      /* html 属性*/  
.CodeRay .c  { color:#BC9358; font-style: italic; } /* 注释 */  
.CodeRay .ch { color:#509E4F }                      /* 转义字符 */  
.CodeRay .cl { color:#FFF }                         /* 类 */  
.CodeRay .co { color:#FFF }                         /* 常数 */  
.CodeRay .fl { color:#A4C260 }                      /* 浮点数 */  
.CodeRay .fu { color:#FFC56D }                      /* 方法 */  
.CodeRay .gv { color:#D0CFFE }                      /* 全局变量 */  
.CodeRay .i  { color:#A4C260 }                      /* 整型 */  
.CodeRay .il { background:#151515 }                 /* 内联代码 */  
.CodeRay .iv { color:#D0CFFE }                      /* 实例变量 */  
.CodeRay .pp { color:#E7BE69 }                      /* 文档类型 */  
.CodeRay .r  { color:#CB7832 }                      /* 关键字 */  
.CodeRay .rx { color:#A4C260 }                      /* 正则表达式 */  
.CodeRay .s  { color:#A4C260 }                      /* 字符串 */  
.CodeRay .sy { color:#6C9CBD }                      /* 符号 */  
.CodeRay .ta { color:#E7BE69 }                      /* html 标签 */  
.CodeRay .pc { color:#6C9CBD }                      /* 布尔型 */

<%= stylesheet_link_tag 'blog', 'coderay' %>

<%= textilize(coderay(@article.content)) %>

def coderay(text)   
text.gsub(/\<code( lang="(.+?)")?\>(.+?)\<\/code\>/m) do  
  content_tag("notextile", CodeRay.scan($3, $2).div(:css => :class))   
end  
end

The piano is a musical instrument played by means of a keyboard that produces sound by striking steel strings with felt hammers. The hammers immediately rebound allowing the strings to continue vibrating at their resonant frequency. These vibrations are transmitted through a bridge to a soundboard that amplifies them.

* item
* item 2

<code lang="ruby">
def hello
puts 'Hello, world!'
end
</code>