Dart classify markup example

I was looking for a simple way to create some markup dynamically of syntax highlighted dart code, in dart! A big thanks to Bob Nystrom from the Dart team for suggesting the simplest solution. Use classify from dartdoc.

A live example of this can be found here along with the source code.

Example of how to use dartdoc/classify.dart
dartdoc is used for generating static HTML for the api.dartlang.org site. This example shows how importing dartdoc/classify.dart one could generate syntax highlighted dart code at runtime.

Patching
Currently you need to modify the import statement to reference the location of classify.dart.

#import('../../dart_bleeding/dart/utils/dartdoc/classify.dart', prefix:"classify");

Building
Build with minfrog for best results. At the moment dart editor does not seem happy with me on importing dartdoc/classify.dart. So compiling with minfrog worked best.

minfrog --compile-only --out=ClassifyExample.dart.js ClassifyExample.dart

Using classify
This is the easiest part! Create a SourceFile and add pass it along to classifySource which will return a properly formatted string of span elements that has class attributes set. From that point you can add a css style to the span elements.

    String code = "main() { print('hello world'); }";
    classify.SourceFile sf = new classify.SourceFile("sf.dart", code);
    String c = classify.classifySource(sf);
   <span class="i ">main</span><span class="p ">(</span><span class="p ">)</span><span> 
   </span><span class="p ">{</span><span> </span><span class="i ">print</span>
   <span class="p ">(</span><span class="s si">'hello world'</span>
   <span class="p ">)</span><span class="p ">;</span><span> </span><span class="p ">}</span> 

Example css style

/* Syntax highlighting. */
/* Note: these correspond to the constants in classify.dart. */
.e { color: hsl(  0, 100%, 70%); } /* Error */
.c { color: hsl(220,  20%, 65%); } /* Comment */
.i { color: hsl(220,  20%, 20%); } /* Identifier */
.k { color: hsl(220, 100%, 50%); } /* Keyword */
.p { color: hsl(220,  20%, 50%); } /* Punctuation */
.o { color: hsl(220,  40%, 50%); } /* Operator */
.s { color: hsl( 40,  90%, 40%); } /* String */
.n { color: hsl( 30,  70%, 50%); } /* Number */
.t { color: hsl(180,  40%, 40%); } /* Type Name */
.r { color: hsl(200, 100%, 50%); } /* Special Identifier */
.a { color: hsl(220, 100%, 45%); } /* Arrow */

/* Interpolated expressions within strings. */
.si {
  background: hsl(40, 100%, 90%);
}

.s.si { background: hsl(40, 80%, 95%); }
.i.si { color: hsl(40, 30%, 30%); }
.p.si { color: hsl(40, 60%, 40%); }

Dart: Updated Dartium builds with breakpoint support for Linux and Mac

As Seth Ladd has commented on google plus, Dartium now has breakpoint support. Big win in such an early stage of the project. Providing Release builds for Mac and Linux below. While I was trying breakpoints out, one thing noticed was to getting scripts to show up properly in inspector you need to hit an extra refresh on the page. My public is can be found on pgp.mit.edu.

wget http://dl.dropbox.com/u/33138127/dartium_macosx/Chromium.app.tar.gz
wget http://dl.dropbox.com/u/33138127/dartium_macosx/Chromium.app.tar.gz.sig
wget http://dl.dropbox.com/u/33138127/dartium_macosx/Chromium.app.tar.gz.md5
wget http://dl.dropbox.com/u/33138127/dartium_macosx/README.txt
gpg --verify Chromium.app.tar.gz.sig Chromium.app.tar.gz
md5sum -c Chromium.app.tar.gz.md5
wget http://gsdview.appspot.com/dart-editor-archive-continuous/latest/DartBuild-linux.gtk.x86.zip
wget http://dl.dropbox.com/u/33138127/dartium/dartium-linux-32bit-Release.tar.gz
wget http://dl.dropbox.com/u/33138127/dartium/dartium-linux-32bit-Release.tar.gz.sig
wget http://dl.dropbox.com/u/33138127/dartium/dartium-linux-32bit-Release.tar.gz.md5
wget http://dl.dropbox.com/u/33138127/dartium/README.txt
gpg --verify dartium-linux-32bit-Release.tar.gz.sig dartium-linux-32bit-Release.tar.gz
md5sum -c dartium-linux-32bit-Release.tar.gz.md5

Dart: Example of WebGL on Dart

My hacking attempts with webgl on dart has made me revert to using ‘dart:dom’. While I really enjoy ‘dart:html’, one might not be able to use some of the more important webgl methods. The reason would be the missing constructors on Float32Array, an issue has been filed. For now the following sample with code could help guide those excited to play with webgl on dart. Thank you Learning WebGL for the sample code work with.

Dart: fillstyle on cavnas

To be able to draw on canvas in Dart you need two things. A canvas element defined and a canvas rendering context to draw on. In this example we use a CanvasRenderingContext2D to fillstyle a set of rectangles with rgb colors of size x and y. Modified for Dart, mozilla developer example can be done the following way. Check a live example here.

<html>
  <head>
    <title>CanvasFillstyleExample</title>
  </head>
  <body>
    <canvas id="canvas" width="600" height="600"></canvas>
    <script type="text/javascript" src="CanvasFillstyleExample.dart.app.js"></script>
  </body>
</html>
  draw() {
    var ctx = document.query('canvas').getContext('2d');
    for (var i=0;i<6;i++){
      for (var j=0;j<6;j++){
        ctx.fillStyle = 'rgb(' + (255-42.5*i).floor().toString() + ',' + 
                         (255-42.5*j).floor().toString() + ',0)';
        ctx.fillRect(j*25,i*25,25,25);
      }
    }
  }

Dart: CSS3 Slider Carousel

The slider carousel by html5rocks now comes with an example in dart. I may have loaded to many  images into the single page, might take a few seconds to load. The source code can be found on github. Dart provides a simpler way to deal with client side programming, cleaner syntax and simple access to the DOM. Go Dart!

screenshot

Dart: Updated Dartium builds for Linux and Mac

Following the similar posts as before, you can get the latest Dartium builds for Mac OSX and 32bit Linux here. My public is can be found on pgp.mit.edu. Please contact me if you have any issues, only providing these until Dartium hits the prime time. Keep in mind that nothing is guaranteed to work at this point… but some stuff does.

wget http://dl.dropbox.com/u/33138127/dartium_macosx/Chromium.app.tar.gz
wget http://dl.dropbox.com/u/33138127/dartium_macosx/Chromium.app.tar.gz.sig
wget http://dl.dropbox.com/u/33138127/dartium_macosx/Chromium.app.tar.gz.md5
wget http://dl.dropbox.com/u/33138127/dartium_macosx/README.txt
gpg --verify Chromium.app.tar.gz.sig Chromium.app.tar.gz
md5sum -c Chromium.app.tar.gz.md5
wget http://gsdview.appspot.com/dart-editor-archive-continuous/latest/DartBuild-linux.gtk.x86.zip
wget http://dl.dropbox.com/u/33138127/dartium/dartium-linux-32bit-Release.tar.gz
wget http://dl.dropbox.com/u/33138127/dartium/dartium-linux-32bit-Release.tar.gz.sig
wget http://dl.dropbox.com/u/33138127/dartium/dartium-linux-32bit-Release.tar.gz.md5
wget http://dl.dropbox.com/u/33138127/dartium/README.txt
gpg --verify dartium-linux-32bit-Release.tar.gz.sig dartium-linux-32bit-Release.tar.gz
md5sum -c dartium-linux-32bit-Release.tar.gz.md5

Dart: Web terminal sample

I’ve always been impressed by the css/html5/javascript web terminals that show off the filesystem API.┬áNow Dart has a sample web terminal with minimal implementation.

webterminal

Simply add your command implementations to the Terminal.dart by adding commands to the CMDS list and providing functions to the matching switch statement.

cmds

switch

With in the next day or so the dart-web-terminal should include an example with filesystem API in dart.

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