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Highlight.js highlights syntax in code examples on blogs, forums and in fact on any web pages. It's very easy to use because it works automatically: finds blocks of code, detects a language, highlights it. Learn more.

You can even use Github Flavored Markdown

Python

@requires_authorization
def somefunc(param1='', param2=0):
    r'''A docstring'''
    if param1 > param2: # interesting
        print 'Gre\'ater'
    return (param2 - param1 + 1) or None

class SomeClass:<br>    pass

>>> message = '''interpreter
... prompt'''

Python's profiler output

	   261917242 function calls in 686.251 CPU seconds

       ncalls  tottime  filename:lineno(function)
       152824  513.894  {method 'sort' of 'list' objects}
    129590630   83.894  rrule.py:842(__cmp__)
    129590630   82.439  {cmp}
       153900    1.296  rrule.py:399(_iter)
304393/151570    0.963  rrule.py:102(_iter_cached)

Ruby

class A < B; def self.create(object = User) object end end
class Zebra; def inspect; "X#{2 + self.object_id}" end end

module ABC::DEF
  include Comparable

  # @param test
  # @return [String] nothing
  def foo(test)
    Thread.new do |blockvar|
      ABC::DEF.reverse(:a_symbol, :'a symbol', :<=>, 'test' + test)
    end.join
  end

  def [](index) self[index] end
  def ==(other) other == self end
end

anIdentifier = an_identifier
Constant = 1
render action: :new

Haml

!!! XML
%html
  %body
    %h1.jumbo{:id=>"a", :style=>'font-weight: normal', :title=>title} highlight.js
    /html comment
    -# ignore this line
    %ul(style='margin: 0')
    -items.each do |i|
      %i= i
    = variable
    =variable2
    ~ variable3
    ~variable4
    The current year is #{DataTime.now.year}.

Perl

# loads object
sub load
{
  my $flds = $c->db_load($id,@_) || do {
    Carp::carp "Can`t load (class: $c, id: $id): '$!'"; return undef
  };
  my $o = $c->_perl_new();
  $id12 = $id / 24 / 3600;
  $o->{'ID'} = $id12 + 123;
  #$o->{'SHCUT'} = $flds->{'SHCUT'};
  my $p = $o->props;
  my $vt;
  $string =~ m/^sought_text$/;
  $items = split //, 'abc';
  for my $key (keys %$p)
  {
    if(${$vt.'::property'}) {
      $o->{$key . '_real'} = $flds->{$key};
      tie $o->{$key}, 'CMSBuilder::Property', $o, $key;
    }
  }
  $o->save if delete $o->{'_save_after_load'};
  return $o;
}

=head1 NAME
POD till the end of file

PHP

require_once 'Zend/Uri/Http.php';

abstract class URI extends BaseURI
{

  /**
   * Returns a URI
   *
   * @return  URI
   */
  static public function _factory($stats = array(), $uri = 'http')
  {
      $uri = explode(':', $uri, 0b10);
      $schemeSpecific = isset($uri[1]) ? $uri[1] : '';
      $desc = 'Multi
line description';

      // Security check
      if (!ctype_alnum($scheme)) {
          throw new Zend_Uri_Exception('Illegal scheme');
      }

      return [
        'uri' => $uri,
        'value' => null,
      ];
  }
}

__halt_compiler () ; datahere
datahere
datahere */
datahere

Scala

object abstractTypes extends Application {
  abstract class SeqBuffer {
    type T; val element: Seq[T]; def length = element.length
  }
}

/** Turn command line arguments to uppercase */
object Main {
  def main(args: Array[String]) {
    val res = for (a <- args) yield a.toUpperCase
    println("Arguments: " + res.toString)
  }
}

/** Maps are easy to use in Scala. */
object Maps {
  val colors = Map("red" -> 0xFF0000,
                   "turquoise" -> 0x00FFFF,
                   "black" -> 0x000000,
                   "orange" -> 0xFF8040,
                   "brown" -> 0x804000)
  def main(args: Array[String]) {
    for (name <- args) println(
      colors.get(name) match {
        case Some(code) =>
          name + " has code: " + code
        case None =>
          "Unknown color: " + name
      }
    )
  }
}

Go

package main

import (
    "fmt"
    "rand"
    "os"
)

const (
    Sunday = iota
    Partyday
    numberOfDays  // this constant is not exported
)

type Foo interface {
    FooFunc(int, float32) (complex128, []int)
}

// simple comment
type Bar struct {
    os.File /* multi
    line
    comment */

    PublicData chan int
}

func main() {
    ch := make(chan int)
    ch <- 1
    x, ok := <- ch
    ok = true
    x = nil
    float_var := 1.0e10
    defer fmt.Println('\'')
    defer fmt.Println(`exitting now\`)
    var fv1 float64 = 0.75
    go println(len("hello world!"))
    return
}

XML

<?xml version="1.0"?>
<response value="ok" xml:lang="en">
  <text>Ok</text>
  <comment html_allowed="true"/>
  <ns1:description><![CDATA[
  CDATA is <not> magical.
  ]]></ns1:description>
  <a></a> <a/>
</response>

HTML (with inline css and javascript)

<!DOCTYPE html>
<title>Title</title>

<style>body {width: 500px;}</style>

<script type="application/javascript">
  function $init() {return true;}
</script>

<body>
  <p checked class="title" id='title'>Title</p>
  <!-- here goes the rest of the page -->
</body>

Lasso

<?LassoScript
/* Lasso 8 */
  local('query' = 'SELECT * FROM `'+var:'table'+'` WHERE `id` > 10
    ORDER BY `Name` LIMIT 30');
  Inline: -Username=$DBuser, -Password=$DBpass, -Database=$DBname, -sql=#query;
    var("class.name" = (found_count != 0 ? `subtotal` | `nonefound`));
    records;
      output: ?><tr>[loop_count]</tr><?=;
    /records;
  /Inline;
?><div class="[$class.name]">[found_count]</div>
[noprocess] causes [delimiters] to be skipped until the next [/noprocess]
<?lasso
/* Lasso 9 */
  define strings_combine(value::string, ...other)::string => {
    local(result = #value->append(#other->asString))
    return #result
  }
  /**! descriptive text */
  define person => type {
    data name::string, protected nickname
    data birthdate::date
    data private ssn = null
    public showName() => return .'name'
    protected fullName() => '"' + .nickname + '"' + .'name'
    public ssnListed => .ssn ? true | false
  }
  define person->name=(value) => {
    .'name' = #value
    return self->'name'
  }
  // query expression
  with n in array(-1, 0xABCD, 3.14159e14)
  let swapped = pair(#n->second, #n->first)
  group #swapped by #n->first into t
  let key = #t->key
  order by #key
  select pair(#key, #t)
  do {^
    #n->upperCase
  ^}
?>

Markdown

# hello world

you can write text [with links](http://example.com).

* one _thing_ has *em*phasis
* two __things__ are **bold**

---

hello world
===========

<this_is inline="xml"></this_is>

> markdown is so cool

    so are code segments

1. one thing (yeah!)
2. two thing `i can write code`, and `more` wipee!

AsciiDoc

Hello, World!
============
Author Name, <author@domain.foo>

you can write text http://example.com[with links], optionally
using an explicit link:http://example.com[link prefix].

* single quotes around a phrase place 'emphasis'
** alternatively, you can put underlines around a phrase to add _emphasis_
* astericks around a phrase make the text *bold*
* pluses around a phrase make it +monospaced+

- escape characters are supported
- you can escape a quote inside emphasized text like 'here\'s johnny!'

term:: definition
 another term:: another definition

// this is just a comment

Let's make a break.

'''

////
we'll be right with you

after this brief interruption.
////

== We're back!

Want to see a image::images/tiger.png[Tiger]?

.Nested highlighting
++++
<this_is inline="xml"></this_is>
++++

____
asciidoc is so powerful.
____

another quote:

[quote, Sir Arthur Conan Doyle, The Adventures of Sherlock Holmes]
____
When you have eliminated all which is impossible, then whatever remains, however improbable, must be the truth.
____

Getting Literal
---------------

 want to get literal? prefix a line with a space.

....
I'll join that party, too.
....

. one thing (yeah!)
. two thing `i can write code`, and `more` wipee!

NOTE: AsciiDoc is quite cool, you should try it.

Django templates

{% if articles|length %}
{% for article in articles %}

{# Striped table #}
<tr class="{% cycle odd,even %}">
  <td>{{ article|default:"Hi... "|escape }}</td>
  <td {% if article.today %}class="today"{% endif %}>{{ article.date|date:"d.m.Y" }}</td>
</tr>

{% endfor %}
{% endif %}

{% comment %}
Comments may be long and
multiline.
{% endcomment %}

Handlebars

<h3>Hours</h3>

<ul>
  {{#each content.users}}
  <li {{bindAttr hello="world"}}>{{firstName}}</li>
  {{/each}}
</ul>

CSS

@media screen and (-webkit-min-device-pixel-ratio: 0) {
  body:first-of-type pre::after {
    content: 'highlight: ' attr(class);
  }
  body {
    background: linear-gradient(45deg, blue, red);
  }
}

@import url('print.css');
@page:right {
 margin: 1cm 2cm 1.3cm 4cm;
}

@font-face {
  font-family: Chunkfive; src: url('Chunkfive.otf');
}

div.text,
#content,
li[lang=ru] {
  font: Tahoma, Chunkfive, sans-serif;
  background: url('hatch.png') /* wtf? */;  color: #F0F0F0 !important;
  width: 100%;
}

SCSS

@import "compass/reset";

// variables
$colorGreen: #008000;
$colorGreenDark: darken($colorGreen, 10);

@mixin container {
    max-width: 980px;
}

// mixins with parameters
@mixin button($color:green) {
    @if ($color == green) {
        background-color: #008000;
    }
    @else if ($color == red) {
        background-color: #B22222;
    }
}

button {
    @include button(red);
}

div,
.navbar,
#header,
input[type="input"] {
    font-family: "Helvetica Neue", Arial, sans-serif;
    width: auto;
    margin: 0 auto;
    display: block;
}

.row-12 > [class*="spans"] {
    border-left: 1px solid #B5C583;
}

// nested definitions
ul {
    width: 100%;
    padding: {
        left: 5px; right: 5px;
    }
  li {
      float: left; margin-right: 10px;
      .home {
          background: url('http://placehold.it/20') scroll no-repeat 0 0;
    }
  }
}

.banner {
    @extend .container;
}

a {
  color: $colorGreen;
  &:hover { color: $colorGreenDark; }
  &:visited { color: #c458cb; }
}

@for $i from 1 through 5 {
    .span#{$i} {
        width: 20px*$i;
    }
}

@mixin mobile {
  @media screen and (max-width : 600px) {
    @content;
  }
}

JSON

[
  {
    "title": "apples",
    "count": [12000, 20000],
    "description": {"text": "...", "sensitive": false}
  },
  {
    "title": "oranges",
    "count": [17500, null],
    "description": {"text": "...", "sensitive": false}
  }
]

JavaScript

function $initHighlight(block, flags) {
  try {
    if (block.className.search(/\bno\-highlight\b/) != -1)
      return processBlock(block, true, 0x0F) + ' class=""';
  } catch (e) {
    /* handle exception */

    var e4x =
        <div>Example
            <p>1234</p></div>;
  }
  for (var i = 0 / 2; i < classes.length; i++) { // "0 / 2" should not be parsed as regexp
    if (checkCondition(classes[i]) === undefined)
      return /\d+[\s/]/g;
  }
}

CoffeeScript

# Divisions
x = 6/foo/i
x = 6 /foo
x = 6 / foo
x = 6 /foo * 2/gm
x = f /foo
x = f / foo / gm
x = f /foo * 2/6

# Regexps
x = f /6 * 2/ - 3
x = f /foo * 2/gm
x = if true then /\n/ else /[.,]+/

grade = (student, period=(if b? then 7 else 6), messages={"A": "Excellent"}) ->
  if student.excellentWork
    "A+"
  else if student.okayStuff
    if student.triedHard then "B" else "B-"
  else
    "C"

square = (x) -> x * x

two = -> 2

math =
  root:   Math.sqrt
  square: square
  cube:   (x) -> x * square x

race = (winner, runners...) ->
  print winner, runners

class Animal extends Being
  constructor: (@name) ->

  move: (meters) ->
    alert @name + " moved #{meters}m."

hi = `function() {
  return [document.title, "Hello JavaScript"].join(": ");
}`

heredoc = """
CoffeeScript subst test #{ 010 + 0xf / 0b10 + "nested string #{ /\n/ }"}
"""

###
CoffeeScript Compiler v1.2.0
Released under the MIT License
###

OPERATOR = /// ^ (
?: [-=]>             # function
) ///

ActionScript

package org.example.dummy {
    import org.dummy.*;

    /*define package inline interface*/
    public interface IFooBarzable {
        public function foo(... pairs):Array;
    }

    public class FooBar implements IFooBarzable {
        static private var cnt:uint = 0;
        private var bar:String;

        //constructor
        public function TestBar(bar:String):void {
            bar = bar;
            ++cnt;
        }

        public function foo(... pairs):Array {
            pairs.push(bar);
            return pairs;
        }
    }
}

VB.NET

Import System
Import System.IO
#Const DEBUG = True

Namespace Highlighter.Test
  ''' <summary>This is an example class.</summary>
  Public Class Program
    Protected Shared hello As Integer = 3
    Private Const ABC As Boolean = False

#Region "Code"
    ' Cheers!
    <STAThread()> _
    Public Shared Sub Main(ByVal args() As String, ParamArray arr As Object) Handles Form1.Click
      On Error Resume Next
      If ABC Then
        While ABC : Console.WriteLine() : End While
        For i As Long = 0 To 1000 Step 123
          Try
            System.Windows.Forms.MessageBox.Show(CInt("1").ToString())
          Catch ex As Exception       ' What are you doing? Well...
            Dim exp = CType(ex, IOException)
            REM ORZ
            Return
          End Try
        Next
      Else
        Dim l As New System.Collections.List<String>()
        SyncLock l
          If TypeOf l Is Decimal And l IsNot Nothing Then
            RemoveHandler button1.Paint, delegate
          End If
          Dim d = New System.Threading.Thread(AddressOf ThreadProc)
          Dim a = New Action(Sub(x, y) x + y)
          Static u = From x As String In l Select x.Substring(2, 4) Where x.Length > 0
        End SyncLock
        Do : Laugh() : Loop Until hello = 4
      End If
    End Sub
#End Region
  End Class
End Namespace

HTTP

POST /task?id=1 HTTP/1.1
Host: example.org
Content-Type: application/json; charset=utf-8
Content-Length: 19

{"status": "ok", "extended": true}

Lua

--[[
Simple signal/slot implementation
]]
local signal_mt = {
    __index = {
        register = table.insert
    }
}
function signal_mt.__index:emit(... --[[ Comment in params ]])
    for _, slot in ipairs(self) do
        slot(self, ...)
    end
end
local function create_signal()
    return setmetatable({}, signal_mt)
end

-- Signal test
local signal = create_signal()
signal:register(function(signal, ...)
    print(...)
end)
signal:emit('Answer to Life, the Universe, and Everything:', 42)

--[==[ [=[ [[
Nested ]]
multi-line ]=]
comment ]==]
[==[ Nested
[=[ multi-line
[[ string
]] ]=] ]==]

AppleScript

repeat 5 times
    if foo is greater than bar then
        display dialog "Hello there"
    else
        beep
    end if
end repeat

(* comment (*nested comment*) *)
on do_something(s, y)
    return {s + pi, y mod 4}
end do_something

do shell script "/bin/echo 'hello'"

Delphi

TList=Class(TObject)
Private
  Some: String;
Public
  Procedure Inside; // Suxx
End;{TList}

Procedure CopyFile(InFileName,var OutFileName:String);
Const
  BufSize=4096; (* Huh? *)
Var
  InFile,OutFile:TStream;
  Buffer:Array[1..BufSize] Of Byte;
  ReadBufSize:Integer;
Begin
  InFile:=Nil;
  OutFile:=Nil;
  Try
    InFile:=TFileStream.Create(InFileName,fmOpenRead);
    OutFile:=TFileStream.Create(OutFileName,fmCreate);
    Repeat
      ReadBufSize:=InFile.Read(Buffer,BufSize);
      OutFile.Write(Buffer,ReadBufSize);
    Until ReadBufSize<>BufSize;
    Log('File '''+InFileName+''' copied'#13#10);
  Finally
    InFile.Free;
    OutFile.Free;
  End;{Try}
End;{CopyFile}

Java

/**
 * @author John Smith <john.smith@example.com>
 * @version 1.0
*/
package l2f.gameserver.model;

import java.util.ArrayList;

public abstract class L2Character extends L2Object {
  public static final Short ABNORMAL_EFFECT_BLEEDING = 0x0001; // not sure

  public void moveTo(int x, int y, int z) {
    _ai = null;
    _log.warning("Should not be called");
    if (1 > 5) {
      return;
    }
  }

  /** Task of AI notification */
  @SuppressWarnings( { "nls", "unqualified-field-access", "boxing" })
  public class NotifyAITask implements Runnable {
    private final CtrlEvent _evt;

    public void run() {
      try {
        getAI().notifyEvent(_evt, null, null);
      } catch (Throwable t) {
        t.printStackTrace();
      }
    }
  }
}

C++

#include <iostream>

int main(int argc, char *argv[]) {

  /* An annoying "Hello World" example */
  for (auto i = 0; i < 0xFFFF; i++)
    cout << "Hello, World!" << endl;

  char c = '\n';
  unordered_map <string, vector<string> > m;
  m["key"] = "\\\\"; // this is an error

  return -2e3 + 12l;
}

Objective C

#import <UIKit/UIKit.h>
#import "Dependency.h"

@protocol WorldDataSource
@optional
- (NSString*)worldName;
@required
- (BOOL)allowsToLive;
@end

@interface Test : NSObject <HelloDelegate, WorldDataSource> {
  NSString *_greeting;
}

@property (nonatomic, readonly) NSString *greeting;
- (IBAction) show;
@end

@implementation Test

@synthesize test=_test;

+ (id) test {
  return [self testWithGreeting:@"Hello, world!\nFoo bar!"];
}

+ (id) testWithGreeting:(NSString*)greeting {
  return [[[self alloc] initWithGreeting:greeting] autorelease];
}

- (id) initWithGreeting:(NSString*)greeting {
  if ( (self = [super init]) ) {
    _greeting = [greeting retain];
  }
  return self;
}

- (void) dealloc {
  [_greeting release];
  [super dealloc];
}

@end

Vala

using DBus;

namespace Test {
  class Foo : Object {
    public signal void some_event ();   // definition of the signal
    public void method () {
      some_event ();                    // emitting the signal (callbacks get invoked)
    }
  }
}

/* defining a class */
class Track : GLib.Object, Test.Foo {              /* subclassing 'GLib.Object' */
  public double mass;                  /* a public field */
  public double name { get; set; }     /* a public property */
  private bool terminated = false;     /* a private field */
  public void terminate() {            /* a public method */
    terminated = true;
  }
}

const ALL_UPPER_CASE = "you should follow this convention";

var t = new Track();      // same as: Track t = new Track();
var s = "hello";          // same as: string s = "hello";
var l = new List<int>();       // same as: List<int> l = new List<int>();
var i = 10;               // same as: int i = 10;


#if (ololo)
Regex regex = /foo/;
#endif

/*
 * Entry point can be outside class
 */
void main () {
  var long_string = """
    Example of "verbatim string".
    Same as in @"string" in C#
  """
  var foo = new Foo ();
  foo.some_event.connect (callback_a);      // connecting the callback functions
  foo.some_event.connect (callback_b);
  foo.method ();
}

C

using System;

#pragma warning disable 414, 3021

public class Program
{
    /// <summary>The entry point to the program.</summary>
    public static int Main(string[] args)
    {
        Console.WriteLine("Hello, World!");
        string s = @"This
""string""
spans
multiple
lines!";
        return 0;
    }
}

async Task<int> AccessTheWebAsync()
{
    // ...
    string urlContents = await getStringTask;
    return urlContents.Length;
}

F

open System

// Single line comment...
(*
  This is a
  multiline comment.
*)
let checkList alist =
    match alist with
    | [] -> 0
    | [a] -> 1
    | [a; b] -> 2
    | [a; b; c] -> 3
    | _ -> failwith "List is too big!"


type IEncoding =
    abstract Encode : string -> string
    abstract Decode : string -> string

let text = "Some text..."
let text2 = @"A ""verbatim"" string..."
let catalog = """
Some "long" string...
"""

let rec fib x = if x <= 2 then 1 else fib(x-1) + fib(x-2)

let fibs =
    Async.Parallel [ for i in 0..40 -> async { return fib(i) } ]
    |> Async.RunSynchronously

type Sprocket(gears) =
  member this.Gears : int = gears

[<AbstractClass>]
type Animal =
  abstract Speak : unit -> unit

type Widget =
  | RedWidget
  | GreenWidget

type Point = {X: float; Y: float;}

[<Measure>]
type s
let minutte = 60<s>

D

#!/usr/bin/rdmd
// Computes average line length for standard input.
import std.stdio;

/+
  this is a /+ nesting +/ comment
+/

enum COMPILED_ON = __TIMESTAMP__;  // special token

enum character = '©';
enum copy_valid = '&copy;';
enum backslash_escaped = '\\';

// string literals
enum str = `hello "world"!`;
enum multiline = r"lorem
ipsum
dolor";  // wysiwyg string, no escapes here allowed
enum multiline2 = "sit
amet
\"adipiscing\"
elit.";
enum hex = x"66 6f 6f";   // same as "foo"

#line 5

// float literals
enum f = [3.14f, .1, 1., 1e100, 0xc0de.01p+100];

static if (something == true) {
   import std.algorithm;
}

void main() pure nothrow @safe {
    ulong lines = 0;
    double sumLength = 0;
    foreach (line; stdin.byLine()) {
        ++lines;
        sumLength += line.length;
    }
    writeln("Average line length: ",
        lines ? sumLength / lines : 0);
}

RenderMan RSL

#define TEST_DEFINE 3.14
/*  plastic surface shader
 *
 *  Pixie is:
 *  (c) Copyright 1999-2003 Okan Arikan. All rights reserved.
 */

surface plastic (float Ka = 1, Kd = 0.5, Ks = 0.5, roughness = 0.1;
                 color specularcolor = 1;) {
  normal Nf = faceforward (normalize(N),I);
  Ci = Cs * (Ka*ambient() + Kd*diffuse(Nf)) + specularcolor * Ks *
       specular(Nf,-normalize(I),roughness);
  Oi = Os;
  Ci *= Oi;
}

RenderMan RIB

FrameBegin 0
Display "Scene" "framebuffer" "rgb"
Option "searchpath" "shader" "+&:/home/kew"
Option "trace" "int maxdepth" [4]
Attribute "visibility" "trace" [1]
Attribute "irradiance" "maxerror" [0.1]
Attribute "visibility" "transmission" "opaque"
Format 640 480 1.0
ShadingRate 2
PixelFilter "catmull-rom" 1 1
PixelSamples 4 4
Projection "perspective" "fov" 49.5502811377
Scale 1 1 -1

WorldBegin

ReadArchive "Lamp.002_Light/instance.rib"
Surface "plastic"
ReadArchive "Cube.004_Mesh/instance.rib"
# ReadArchive "Sphere.010_Mesh/instance.rib"
# ReadArchive "Sphere.009_Mesh/instance.rib"
ReadArchive "Sphere.006_Mesh/instance.rib"

WorldEnd
FrameEnd

MEL (Maya Embedded Language)

proc string[] getSelectedLights()

{
  string $selectedLights[];

  string $select[] = `ls -sl -dag -leaf`;

  for ( $shape in $select )
  {
    // Determine if this is a light.
    //
    string $class[] = getClassification( `nodeType $shape` );


    if ( ( `size $class` ) > 0 && ( "light" == $class[0] ) )
    {
      $selectedLights[ `size $selectedLights` ] = $shape;
    }
  }

  // Result is an array of all lights included in

  // current selection list.
  return $selectedLights;
}

GLSL

// vertex shader
#version 150
in  vec2 in_Position;
in  vec3 in_Color;

out vec3 ex_Color;
void main(void) {
    gl_Position = vec4(in_Position.x, in_Position.y, 0.0, 1.0);
    ex_Color = in_Color;
}


// geometry shader
#version 150

layout(triangles) in;
layout(triangle_strip, max_vertices = 3) out;

void main() {
  for(int i = 0; i < gl_in.length(); i++) {
    gl_Position = gl_in[i].gl_Position;
    EmitVertex();
  }
  EndPrimitive();
}


// fragment shader
#version 150
precision highp float;

in  vec3 ex_Color;
out vec4 gl_FragColor;

void main(void) {
    gl_FragColor = vec4(ex_Color, 1.0);
}

SQL

BEGIN;
CREATE TABLE "topic" (
    "id" serial NOT NULL PRIMARY KEY,
    "forum_id" integer NOT NULL,
    "subject" varchar(255) NOT NULL
);
ALTER TABLE "topic" ADD CONSTRAINT forum_id FOREIGN KEY ("forum_id") REFERENCES "forum" ("id");

-- Initials
insert into "topic" ("forum_id", "subject") values (2, 'D''artagnian');

select count(*) from cicero_forum;

-- this line lacks ; at the end to allow people to be sloppy and omit it in one-liners
COMMIT

SmallTalk

Object>>method: num
    "comment 123"
    | var1 var2 |
    (1 to: num) do: [:i | |var| ^i].
    Klass with: var1.
    Klass new.
    arr := #('123' 123.345 #hello Transcript var $@).
    arr := #().
    var2 = arr at: 3.
    ^ self abc

heapExample
    "HeapTest new heapExample"
    "Multiline
    decription"
    | n rnd array time sorted |
    n := 5000.
    "# of elements to sort"
    rnd := Random new.
    array := (1 to: n)
                collect: [:i | rnd next].
    "First, the heap version"
    time := Time
                millisecondsToRun: [sorted := Heap withAll: array.
    1
        to: n
        do: [:i |
            sorted removeFirst.
            sorted add: rnd next]].
    Transcript cr; show: 'Time for Heap: ' , time printString , ' msecs'.
    "The quicksort version"
    time := Time
                millisecondsToRun: [sorted := SortedCollection withAll: array.
    1
        to: n
        do: [:i |
            sorted removeFirst.
            sorted add: rnd next]].
    Transcript cr; show: 'Time for SortedCollection: ' , time printString , ' msecs'

Lisp

#!/usr/bin/env csi

(defun prompt-for-cd ()
   "Prompts
    for CD"
   (prompt-read "Title" 1.53 1 2/4 1.7 1.7e0 2.9E-4 +42 -7 #b001 #b001/100 #o777 #O777 #xabc55 #c(0 -5.6))
   (prompt-read "Artist" &rest)
   (or (parse-integer (prompt-read "Rating") :junk-allowed t) 0)
  (if x (format t "yes") (format t "no" nil) ;and here comment
  )
  ;; second line comment
  '(+ 1 2)
  (defvar *lines*)                ; list of all lines
  (position-if-not #'sys::whitespacep line :start beg))
  (quote (privet 1 2 3))
  '(hello world)
  (* 5 7)
  (1 2 34 5)
  (:use "aaaa")
  (let ((x 10) (y 20))
    (print (+ x y))
  )

Clojure

;   You must not remove this notice, or any other, from this software.

(ns ^{:doc "The core Clojure language."
       :author "Rich Hickey"}
  clojure.core)

(def unquote)

(def
  ^{:macro true
    :added "1.0"}
  let (fn* let [&form &env & decl] (cons 'let* decl)))

(def

 defn (fn defn [&form &env name & fdecl]
        (let [m (conj {:arglists (list 'quote (sigs fdecl))} m)
              m (let [inline (:inline m)
                      ifn (first inline)
                      iname (second inline)]
                  ;; same as: (if (and (= 'fn ifn) (not (symbol? iname))) ...)
                  (if (if (clojure.lang.Util/equiv 'fn ifn)
                        (if (instance? clojure.lang.Symbol iname) false true))
                    ;; inserts the same fn name to the inline fn if it does not have one
                    (assoc m :inline (cons ifn (cons (clojure.lang.Symbol/intern (.concat (.getName ^clojure.lang.Symbol name) "__inliner"))
                                                     (next inline))))
                    m))
              m (conj (if (meta name) (meta name) {}) m)]
          (list 'def (with-meta name m)
                ;;todo - restore propagation of fn name
                ;;must figure out how to convey primitive hints to self calls first
                (cons `fn fdecl) ))))

(. (var defn) (setMacro))

Ini file

;Settings relating to the location and loading of the database
[Database]
ProfileDir=.
ShowProfileMgr=smart
Profile1_Name[] = "\|/_-=MegaDestoyer=-_\|/"
DefaultProfile=True
AutoCreate = no

[AutoExec]
use-prompt="prompt"
Glob=autoexec_*.ini
AskAboutIgnoredPlugins=0

Apache

# rewrite`s rules for wordpress pretty url
LoadModule rewrite_module  modules/mod_rewrite.so
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . index.php [NC,L]

ExpiresActive On
ExpiresByType application/x-javascript  "access plus 1 days"

<Location /maps/>
  RewriteMap map txt:map.txt
  RewriteMap lower int:tolower
  RewriteCond %{REQUEST_URI} ^/([^/.]+)\.html$ [NC]
  RewriteCond ${map:${lower:%1}|NOT_FOUND} !NOT_FOUND
  RewriteRule .? /index.php?q=${map:${lower:%1}} [NC,L]
</Location>

nginx

user  www www;
worker_processes  2;
pid /var/run/nginx.pid;
error_log  /var/log/nginx.error_log  debug | info | notice | warn | error | crit;

events {
    connections   2000;
    use kqueue | rtsig | epoll | /dev/poll | select | poll;
}

http {
    log_format main      '$remote_addr - $remote_user [$time_local] '
                         '"$request" $status $bytes_sent '
                         '"$http_referer" "$http_user_agent" '
                         '"$gzip_ratio"';

    send_timeout 3m;
    client_header_buffer_size 1k;

    gzip on;
    gzip_min_length 1100;

    #lingering_time 30;

    server {
        server_name   one.example.com  www.one.example.com;
        access_log   /var/log/nginx.access_log  main;

        rewrite (.*) /index.php?page=$1 break;

        location / {
            proxy_pass         http://127.0.0.1/;
            proxy_redirect     off;
            proxy_set_header   Host             $host;
            proxy_set_header   X-Real-IP        $remote_addr;
            charset            koi8-r;
        }

        location /api/ {
            fastcgi_pass 127.0.0.1:9000;
        }

        location ~* \.(jpg|jpeg|gif)$ {
            root         /spool/www;
        }
    }
}

Diff

Index: languages/ini.js
===================================================================
--- languages/ini.js    (revision 199)
+++ languages/ini.js    (revision 200)
@@ -1,8 +1,7 @@
 hljs.LANGUAGES.ini =
 {
   case_insensitive: true,
-  defaultMode:
-  {
+  defaultMode: {
     contains: ['comment', 'title', 'setting'],
     illegal: '[^\\s]'
   },

*** /path/to/original timestamp
--- /path/to/new      timestamp
***************
*** 1,3 ****
--- 1,9 ----
+ This is an important
+ notice! It should
+ therefore be located at
+ the beginning of this
+ document!

! compress the size of the
! changes.

  It is important to spell

DOS batch files

cd \
copy a b
ping 192.168.0.1
@rem ping 192.168.0.1
net stop sharedaccess
del %tmp% /f /s /q
del %temp% /f /s /q
ipconfig /flushdns
taskkill /F /IM JAVA.EXE /T

cd Photoshop/Adobe Photoshop CS3/AMT/
if exist application.sif (
    ren application.sif _application.sif
) else (
    ren _application.sif application.sif
)

taskkill /F /IM proquota.exe /T

sfc /SCANNOW

set path = test

xcopy %1\*.* %2

Bash

#!/bin/bash

###### BEGIN CONFIG
ACCEPTED_HOSTS="/root/.hag_accepted.conf"
BE_VERBOSE=false
###### END CONFIG

if [ "$UID" -ne 0 ]
then
 echo "Superuser rights is required"
 echo 'Printing the # sign'
 exit 2
fi

if test $# -eq 0
then
elif test [ $1 == 'start' ]
else
fi

genApacheConf(){
 if [[ "$2" = "www" ]]
 then
  full_domain=$1
 else
  full_domain=$2.$1
 fi
 host_root="${APACHE_HOME_DIR}$1/$2/$(title)"
 echo -e "# Host $1/$2 :"
}

CMake

project(test)
cmake_minimum_required(VERSION 2.6)

# IF LINUX
if (${CMAKE_SYSTEM_NAME} MATCHES Linux)
    message("\nOS:\t\tLinux")
endif()

# IF WINDOWS
if (${CMAKE_SYSTEM_NAME} MATCHES Windows)
    message("\nOS:\t\tWindows")
endif()

set(test test0.cpp test1.cpp test2.cpp)

include_directories(./)

set(EXECUTABLE_OUTPUT_PATH ../bin)

add_subdirectory(src)

add_executable(test WIN32 ${test})

target_link_libraries(test msimg32)

Axapta

class ExchRateLoadBatch extends RunBaseBatch {
  ExchRateLoad rbc;
  container currencies;
  boolean actual;
  boolean overwrite;
  date beg;
  date end;

  #define.CurrentVersion(5)

  #localmacro.CurrentList
    currencies,
    actual,
    beg,
    end
  #endmacro
}

public boolean unpack(container packedClass) {
  container       base;
  boolean         ret;
  Integer         version    = runbase::getVersion(packedClass);

  switch (version) {
    case #CurrentVersion:
      [version, #CurrentList] = packedClass;
      return true;
    default:
      return false;
  }
  return ret;
}

Oracle Rules Language

//This is a comment
ABORT "You experienced an abort.";
WARN "THIS IS A WARNING";
CALL "RIDER_X";
DONE;
FOR EACH X IN CSV_FILE "d:\lodestar\user\d377.lse"
 LEAVE FOR;
END FOR;
IF ((BILL_KW = 0) AND (KW > 0)) THEN
END IF;
INCLUDE "R1";
LEAVE RIDER;
SELECT BILL_PERIOD
   WHEN "WINTER"
      BLOCK KWH
      FROM 0 TO 400 CHARGE $0.03709
      FROM 400 CHARGE $0.03000
      TOTAL $ENERGY_CHARGE_WIN;
   WHEN "SUMMER"
      $VOLTAGE_DISCOUNT_SUM = $0.00
   OTHERWISE
      $VOLTAGE_DISCOUNT_SUM = $1.00
END SELECT;
/* Report top five peaks */
LABEL PK.NM "Peak Number";
SAVE_UPDATE MV TO TABLE "METERVALUE";

FOR EACH INX IN ARRAYUPPERBOUND(#MYARRAY[])
  #MYARRAY[INX].VALUE = 2;
  CLEAR #MYARRAY[];
END FOR

//Interval Data
HNDL_1_ADD_EDI = INTDADDATTRIBUTE(HNDL_1, "EDI_TRANSACTION", EDI_ID);
HNDL_1_ADD_VAL_MSG = INTDADDVMSG(HNDL_1,"Missing (Status Code 9) values found");
EMPTY_HNDL = INTDCREATEHANDLE('05/03/2006 00:00:00', '05/03/2006 23:59:59', 3600, "Y", "0", " ");

#Если Клиент Тогда
Перем СимвольныйКодКаталога = "ля-ля-ля"; //комментарий
Функция Сообщить(Знач ТекстСообщения, ТекстСообщения2) Экспорт //комментарий к функции
  x=ТекстСообщения+ТекстСообщения2+"
  |строка1
  |строка2
  |строка3";
КонецФункции
#КонецЕсли

// Процедура ПриНачалеРаботыСистемы
//
Процедура ПриНачалеРаботыСистемы()
  Обработки.Помощник.ПолучитьФорму("Форма").Открыть();
  d = '21.01.2008'
КонецПроцедуры

AVR Assembler

;* Title:       Block Copy Routines
;* Version:     1.1

.include "8515def.inc"

    rjmp    RESET   ;reset handle

.def    flashsize=r16       ;size of block to be copied

flash2ram:
    lpm         ;get constant
    st  Y+,r0       ;store in SRAM and increment Y-pointer
    adiw    ZL,1        ;increment Z-pointer
    dec flashsize
    brne    flash2ram   ;if not end of table, loop more
    ret

.def    ramtemp =r1     ;temporary storage register
.def    ramsize =r16        ;size of block to be copied

VHDL

 /*
 * RS-trigger with assynch. reset
 */

library ieee;
use ieee.std_logic_1164.all;

entity RS_trigger is
    generic (T: Time := 0ns);
    port ( R, S  : in  std_logic;
           Q, nQ : out std_logic;
           reset, clock : in  std_logic );
end RS_trigger;

architecture behaviour of RS_trigger is
    signal QT: std_logic; -- Q(t)
begin
    process(clock, reset) is
        subtype RS is std_logic_vector (1 downto 0);
    begin
        if reset = '0' then
            QT <= '0';
        else
            if rising_edge(C) then
                if not (R'stable(T) and S'stable(T)) then
                    QT <= 'X';
                else
                    case RS'(R&S) is
                        when "01" => QT <= '1';
                        when "10" => QT <= '0';
                        when "11" => QT <= 'X';
                        when others => null;
                    end case;
                end if;
            end if;
        end if;
    end process;

    Q  <= QT;
    nQ <= not QT;
end architecture behaviour;

Parser 3

@CLASS
base

@USE
module.p

@BASE
class

# Comment for code
@create[aParam1;aParam2][local1;local2]
  ^connect[mysql://host/database?ClientCharset=windows-1251]
  ^for[i](1;10){
    <p class="paragraph">^eval($i+10)</p>
    ^connect[mysql://host/database]{
      $tab[^table::sql{select * from `table` where a='1'}]
      $var_Name[some${value}]
    }
  }

  ^rem{
    Multiline comment with code: $var
    ^while(true){
      ^for[i](1;10){
        ^sleep[]
      }
    }
  }
  ^taint[^#0A]

@GET_base[]
## Comment for code
  # Isn't comment
  $result[$.hash_item1[one] $.hash_item2[two]]

TeX

\documentclass{article}
\usepackage[koi8-r]{inputenc}
\hoffset=0pt
\voffset=.3em
\tolerance=400
\newcommand{\eTiX}{\TeX}
\begin{document}
\section*{Highlight.js}
\begin{table}[c|c]
$\frac 12\, + \, \frac 1{x^3}\text{Hello \! world}$ & \textbf{Goodbye\~ world} \\\eTiX $ \pi=400 $
\end{table}
Ch\'erie, \c{c}a ne me pla\^\i t pas! % comment \b
G\"otterd\"ammerung~45\%=34.
$$
    \int\limits_{0}^{\pi}\frac{4}{x-7}=3
$$
\end{document}

Haskell

{-# LANGUAGE TypeSynonymInstances #-}
module Network.UDP
( DataPacket(..)
, openBoundUDPPort
, openListeningUDPPort
, pingUDPPort
, sendUDPPacketTo
, recvUDPPacket
, recvUDPPacketFrom
) where

{- this is a {- nested -} comment -}

import qualified Data.ByteString as Strict (ByteString, concat, singleton)
import qualified Data.ByteString.Lazy as Lazy (ByteString, toChunks, fromChunks)
import Data.ByteString.Char8 (pack, unpack)
import Network.Socket hiding (sendTo, recv, recvFrom)
import Network.Socket.ByteString (sendTo, recv, recvFrom)

-- Type class for converting StringLike types to and from strict ByteStrings
class DataPacket a where
  toStrictBS :: a -> Strict.ByteString
  fromStrictBS :: Strict.ByteString -> a

instance DataPacket Strict.ByteString where
  toStrictBS = id
  {-# INLINE toStrictBS #-}
  fromStrictBS = id
  {-# INLINE fromStrictBS #-}

openBoundUDPPort :: String -> Int -> IO Socket
openBoundUDPPort uri port = do
  s <- getUDPSocket
  bindAddr <- inet_addr uri
  let a = SockAddrInet (toEnum port) bindAddr
  bindSocket s a
  return s

pingUDPPort :: Socket -> SockAddr -> IO ()
pingUDPPort s a = sendTo s (Strict.singleton 0) a >> return ()

Erlang

-module(ssh_cli).

-behaviour(ssh_channel).

-include("ssh.hrl").
%% backwards compatibility
-export([listen/1, listen/2, listen/3, listen/4, stop/1]).

%% state
-record(state, {
    cm,
    channel
   }).

test(Foo)->Foo.

init([Shell, Exec]) ->
    {ok, #state{shell = Shell, exec = Exec}};
init([Shell]) ->
    false = not true,
    io:format("Hello, \"~p!~n", [atom_to_list('World')]),
    {ok, #state{shell = Shell}}.

concat([Single]) -> Single;
concat(RList) ->
    EpsilonFree = lists:filter(
        fun (Element) ->
            case Element of
                epsilon -> false;
                _ -> true
            end
        end,
        RList),
    case EpsilonFree of
        [Single] -> Single;
        Other -> {concat, Other}
    end.

union_dot_union({union, _}=U1, {union, _}=U2) ->
    union(lists:flatten(
        lists:map(
            fun (X1) ->
                lists:map(
                    fun (X2) ->
                        concat([X1, X2])
                    end,
                    union_to_list(U2)
                )
            end,
            union_to_list(U1)
        ))).

Erlang REPL

1> Str = "abcd".
"abcd"
2> L = test:length(Str).
4
3> Descriptor = {L, list_to_atom(Str)}.
{4,abcd}
4> L.
4
5> b().
Descriptor = {4,abcd}
L = 4
Str = "abcd"
ok
6> f(L).
ok
7> b().
Descriptor = {4,abcd}
Str = "abcd"
ok
8> {L, _} = Descriptor.
{4,abcd}
9> L.
4
10> 2#101.
5
11> 1.85e+3.
1850

Rust

use std;

import std::io;
export fac, test1;

123;                               // type int
123u;                              // type uint
123_u;                             // type uint
0xff00;                            // type int
0xff_u8;                           // type u8
0b1111_1111_1001_0000_i32;         // type i32
123.0;                             // type float
0.1;                               // type float
3f;                                // type float
0.1f32;                            // type f32
12E+99_f64;                        // type f64

/* Factorial */
fn fac(n: int) -> int {
    let s: str = "This is
a multi-line string.

It ends with an unescaped '\"'.";
    let c: char = 'Ф';

    let result = 1, i = 1;
    while i <= n { // No parens around the condition
        result *= i;
        i += 1;
    }
    ret result;
}

pure fn pure_length<T>(ls: list<T>) -> uint { /* ... */ }

type t = map::hashtbl<int,str>;
let x = id::<int>(10);

// Define some modules.
#[path = "foo.rs"]
mod foo;

iface seq<T> {
    fn len() -> uint;
}

impl <T> of seq<T> for [T] {
    fn len() -> uint { vec::len(self) }
    fn iter(b: fn(T)) {
        for elt in self { b(elt); }
    }
}

enum list<T> {
    nil;
    cons(T, @list<T>);
}

let a: list<int> = cons(7, @cons(13, @nil));

Matlab

n = 20; % number of points
points = [random('unid', 100, n, 1), random('unid', 100, n, 1)];
len = zeros(1, n - 1);
points = sortrows(points);
%% Initial set of points
plot(points(:,1),points(:,2));
for i = 1: n-1
    len(i) = points(i + 1, 1) - points(i, 1);
end
while(max(len) > 2 * min(len))
    [d, i] = max(len);
    k = on_margin(points, i, d, -1);
    m = on_margin(points, i + 1, d, 1);
    xm = 0; ym = 0;
%% New point
    if(i == 1 || i + 1 == n)
        xm = mean(points([i,i+1],1))
        ym = mean(points([i,i+1],2))
    else
        [xm, ym] = dlg1(points([k, i, i + 1, m], 1), ...
            points([k, i, i + 1, m], 2))
    end

    points = [ points(1:i, :); [xm, ym]; points(i + 1:end, :)];
end

function [net] = get_fit_network(inputs, targets)
    % Create Network
    numHiddenNeurons = 20;  % Adjust as desired
    net = newfit(inputs,targets,numHiddenNeurons);
    net.trainParam.goal = 0.01;
    net.trainParam.epochs = 1000;
    % Train and Apply Network
    [net,tr] = train(net,inputs,targets);
end

foo_matrix = [1, 2, 3; 4, 5, 6]''';
foo_cell = {1, 2, 3; 4, 5, 6}''.'.';

R

library(ggplot2)

centre <- function(x, type, ...) {
  switch(type,
         mean = mean(x),
         median = median(x),
         trimmed = mean(x, trim = .1))
}

myVar1
myVar.2
data$x
foo "bar" baz
# test "test"
"test # test"

(123) (1) (10) (0.1) (.2) (1e-7)
(1.2e+7) (2e) (3e+10) (0x0) (0xa)
(0xabcdef1234567890) (123L) (1L)
(0x10L) (10000000L) (1e6L) (1.1L)
(1e-3L) (4123.381E-10i)
(3.) (3.E10) # BUG: .E10 should be part of number

# Numbers in some different contexts
1L
0x40
.234
3.
1L + 30
plot(cars, xlim=20)
plot(cars, xlim=0x20)
foo<-30
my.data.3 <- read() # not a number
c(1,2,3)
1%%2

"this is a quote that spans
multiple lines
\"

is this still a quote? it should be.
# even still!

" # now we're done.

'same for
single quotes #'

# keywords
NULL, NA, TRUE, FALSE, Inf, NaN, NA_integer_,
NA_real_, NA_character_, NA_complex_, function,
while, repeat, for, if, in, else, next, break,
..., ..1, ..2

# not keywords
the quick brown fox jumped over the lazy dogs
null na true false inf nan na_integer_ na_real_
na_character_ na_complex_ Function While Repeat
For If In Else Next Break .. .... "NULL" `NULL` 'NULL'

# operators
+, -, *, /, %%, ^, >, >=, <, <=, ==, !=, !, &, |, ~,
->, <-, <<-, $, :, ::

# infix operator
foo %union% bar
%"test"%
`"test"`

Mizar

::: ## Lambda calculus

environ

  vocabularies LAMBDA,
      NUMBERS,
      NAT_1, XBOOLE_0, SUBSET_1, FINSEQ_1, XXREAL_0, CARD_1,
      ARYTM_1, ARYTM_3, TARSKI, RELAT_1, ORDINAL4, FUNCOP_1;

  :: etc...

begin

reserve D for DecoratedTree,
        p,q,r for FinSequence of NAT,
        x for set;

definition
  let D;

  attr D is LambdaTerm-like means
    (dom D qua Tree) is finite &
::>                          *143,306
    for r st r in dom D holds
      r is FinSequence of {0,1} &
      r^<*0*> in dom D implies D.r = 0;
end;

registration
  cluster LambdaTerm-like for DecoratedTree of NAT;
  existence;
::>       *4
end;

definition
  mode LambdaTerm is LambdaTerm-like DecoratedTree of NAT;
end;

::: Then we extend this ordinary one-step beta reduction, that is,
:::  any subterm is also allowed to reduce.
definition
  let M,N;

  pred M beta N means
    ex p st
      M|p beta_shallow N|p &
      for q st not p is_a_prefix_of q holds
        [r,x] in M iff [r,x] in N;
end;

theorem Th4:
  ProperPrefixes (v^<*x*>) = ProperPrefixes v \/ {v}
proof
  thus ProperPrefixes (v^<*x*>) c= ProperPrefixes v \/ {v}
  proof
    let y;
    assume y in ProperPrefixes (v^<*x*>);
    then consider v1 such that
A1: y = v1 and
A2: v1 is_a_proper_prefix_of v^<*x*> by TREES_1:def 2;
 v1 is_a_prefix_of v & v1 <> v or v1 = v by A2,TREES_1:9;
then
 v1 is_a_proper_prefix_of v or v1 in {v} by TARSKI:def 1,XBOOLE_0:def 8;
then  y in ProperPrefixes v or y in {v} by A1,TREES_1:def 2;
    hence thesis by XBOOLE_0:def 3;
  end;
  let y;
  assume y in ProperPrefixes v \/ {v};
then A3: y in ProperPrefixes v or y in {v} by XBOOLE_0:def 3;
A4: now
    assume y in ProperPrefixes v;
    then consider v1 such that
A5: y = v1 and
A6: v1 is_a_proper_prefix_of v by TREES_1:def 2;
 v is_a_prefix_of v^<*x*> by TREES_1:1;
then  v1 is_a_proper_prefix_of v^<*x*> by A6,XBOOLE_1:58;
    hence thesis by A5,TREES_1:def 2;
  end;
 v^{} = v by FINSEQ_1:34;
  then
 v is_a_prefix_of v^<*x*> & v <> v^<*x*> by FINSEQ_1:33,TREES_1:1;
then  v is_a_proper_prefix_of v^<*x*> by XBOOLE_0:def 8;
then  y in ProperPrefixes v or y = v & v in ProperPrefixes (v^<*x*>)
  by A3,TARSKI:def 1,TREES_1:def 2;
  hence thesis by A4;
end;
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