Here is a way to allow you to extend Symfony 2 Form using tagged Service. I think it's the correct way but not yet documented on the book. Symfony 2 is still brand new and the document is not completed yet, I found out this solution while diving into Symfony Form component :(

Well, the code is quite simple. You need to create a service tagged with form.type_extension with alias value is the type of Form element you want to override. Then make the service inherits from Symfony\Component\Form\AbstractTypeExtension, implement the getExtendedType method to return the same value with alias and then override the buildForm method to do whatever you want with the Form. Here is an example to illustrate how to add more field to a form

services.yml

services:
  demo.form_extension:
    class: Demo\MyBundle\Form\Extension\MyFormExtension
    tags:
      - {name: form.type_extension, alias: form}

FormExtension.php

namespace Demo\MyBundle\Form\Extension;
 
use Symfony\Component\Form\FormEvents;
use Symfony\Component\Form\FormBuilder;
use Symfony\Component\Form\AbstractTypeExtension;
 
class MyFormExtension extends AbstractTypeExtension
{
	public function buildForm(FormBuilder $builder, array $options)
	{
		// TODO: add some check for the form you want to use here
		$data = $options['data'];
 
		// extend the form here, you can also use custom validator
		$builder->add('new_item', 'text');
 
		$builder->addEventListener(FormEvents::POST_BIND, function($event) {
			$form = $event->getForm();
 
			// do whatever you want here, such as additional data binding
		});
	}
 
	public function getExtendedType()
	{
		return 'form';
	}
}

Note: Symfony 2 also has form.extension, you can use it to load form type or extension by PHP. Check Symfony/Component/Form/Extension/Csrf namespace for example.

I just released ChromeSniffer 0.2.9. This is a minor update for chromesniffer after few months. This release fix broken icons on linux, improve YUI, Wordpress, Moodle detection. The following applications are added to detection list:

• OpenCart
• Sitefinity
• Shibboleth
• SiteCatalyst
• Coremetrics
• Twitter and Buzz buttons
• Google Loader
• HeadJS
• RightJS
• Humans TXT

This release is also the first release driven by community. Most of the commits are contributed by community. Many thanks to onlineamateur, kevtufc and nb.

There is no roadmap for 0.2.10 yet, but I am thinking about to extends ChromeSniffer to support to detect additional information of the site too, such as detect for site microfotmat or RDF. CSS framework will be considered too. The goal for chromesniffer will be a tool for developer to have an overview of the technology on the site. If you have any idea, feel free to send me your idea via the contact form.

I just finished my presentation today's afternoon about GBA  project, so this post will be the last post about my Gameboy Advance project. Not too much time pass by since the last post, so not much things were done too. I manage to get a lot of stuff done, but the whole game is not yet finished. There is no princess and no counter for the coins you collect. But anyway, it is a lot of work for a single developer like me. I share the source code of the project in case you need some references.

So the subject is over, I two weeks and a few days to clean up working mess and prepare for the next one.

Cheers,

This is a boring post while I am waiting for checking out the project and copying 2GB of data to another laptop. It's kind of boring because I have these two things finish to continue my work. But actually, this post is not about my boring stuff, hehe, I happen to have a chance to work with GameBoy Advance (GBA) development for the next two weeks and it's quite interesting  so I wanna blog about it. It's just my note about the progress of studying, so don't mind about the noob work.

The very first step is to setup the development environment. Pure C is used and some tools for compiler and emulator. It has been a long time since I come back to low-level C. it's quite fun to work with byte and bit again, it's like stoneage. The emulator is easy, you just go to VBA and download the latest version. For the environment, I think the document is not generally available because I have a hard time to setup the environment. Go to DevKitAdv and download the latest version (latest version is 2003, woot!!!).  I choose release 4, it's look safe. I have no idea which file should download so I just download all, and then later I found out that you will need the following one:

• agb-win-core-r5.zip
• agb-win-binutils-r4.zip
• agb-win-gcc-r4.zip
• agb-win-libstdcpp-r4.zip
• agb-win-newlib-r4.zip
• crtls.zip (for compiling crts0.o)

Extract all these files to a folder, like C:\devkitadv. Then set the PATH variable in  in the Environment Variables window to include the bin folder, my case is C:\devkitadv\bin. Check if you can run gcc from Command line then you are in the right way. Also, you need to download gfx2gba to convert (I don't know other way yet, hehe). Now we are ready to write some hello world.

Open paint, create a hello world picture and then save as BMP format. Make sure it's 8bit BMP or gfx2gba won't work. Copy the image to your workspace folder, name it hello.bmp or so, create src folder and then go to the command line and type gfx2gba -fsrc -osrc hello.bmp, it will create hello.raw.c for you. Then open src\main.c and paste the following code

#include "../common/gba.h"
#include "master.pal.c"
#include "hello.raw.c"
 
#define MODE_4 0x4
#define BG2_ENABLE 0x400
#define VideoBuffer ((unsigned short*)0x6000000)
#define BGPaletteMem ((unsigned short*)0x5000000)
 
int main (void) {
	int i;
 
	REG_DISPCNT = MODE_4 | BG2_ENABLE;
 
	for (i = 0; i < 120*160; ++i) {
		VideoBuffer[i] = ((u16*)hello_Bitmap)[i];
	}
 
	for (i = 0; i < 255; ++i) {
		BGPaletteMem[i] = master_Palette[i];
	}
 
	while (1);
 
	return 0;
}

You can get gba.h on this page. The idea is simple, copy the image to video buffer, then copy the color palette. Now we need to compile this script, open build.bat then paste the following build code

@echo off
 
gcc -O3 -W -o main.elf src\main.c
objcopy -O binary main.elf main.gba

Run this file, If you see main.gba then: congratulation. Open VBA (the emulator) then select main.gba, you will see something like this (depends on your picture, of course!).

This is just the first step, I'm going to blog more about this in next two weeks. Hope so =)) !

Note: In case you have some problem with crt0.o then download crtls.zip, then go to the folder where you extract crtls.zip and type as -o crt0.o crt0.s, then copy crt0.o to  devkitadv\lib\gcc-lib\arm-agb-elf\3.0.2, devkitadv\lib\gcc-lib\arm-agb-elf\3.0.2\interwork, devkitadv\lib\gcc-lib\arm-agb-elf\3.0.2\thumb, devkitadv\lib\gcc-lib\arm-agb-elf\3.0.2\thumb\interwork.