So, I have an app where users should define ActionScript functions.
What do I need to get the string whritten by the user and convert it to bytecode so that I can use it with as3-commons-bytecode?
Edit
I don't think I was clear enough. I need to turn: if(!myValue) {...}
Into this:
...
findpropstrict private::myValue
getproperty private::myValue
not
iffalse L1
...
Because with this ^^^^ code, I can use as3-commons-bytecode to do what I need.
I took a look at this app's source code. It's very confusing, the project is old and the code is a mess, but it works. I need to find "where the magic happens". Can you show me the way?
You should use part of this project :
eval.hurlant.com/demo/#app=da4a&757d-selectedIndex=0
Check source , there is parser to ABC .
I'm not aware of any libraries that do this for you, but to achieve this functionality you should parse user's input into function names.
For example, you can call a function just by having it's name as a String like so:
var functionName:String = "myMethod";
function myMethod():void
{
trace("myMethod");
}
this[functionName](); //traces "myMethod"
Of course, if you wish to interpret advanced strings with getting/setting objects and their properties and any other user defined statements, that would require to write quite a sophisticated string-to-bytecode converter.
UPDATE:
There's also AS3Eval library that might do the job. Take a look at http://eval.hurlant.com/
There is a library for Haxe which makes it possible to compile Actionscript assembly language into ABC at runtime, but this is still lower-level than the Actionscript you normally write.
http://haxe.org/com/libs/format/abc
The most likely solution is a server or other process which can compile and return SWF content for you. Haxe has a very fast and straightforward compiler, but it may also be possible to use Tamarin or another solution for compiling AS3 on the server.
Actually, there is a runtime library for executing Haxe code, which again, is very similar to Actionscript. Might be worth looking into:
http://code.google.com/p/hscript/
What exactly want to do? To compile "string" the string must be something meanfull for the compiler such as package not a simply string ( like 'asdas ' ). If you don't wont to use flash/flex compiler you may compile AS to ABC with Ant or Haxe. But ther is a problem - how you will start this ABC?
Related
I am developing Haxe code that I convert in C# and insert into a Unity project.
The conversion works fine and I am able to use the generated class when I import it alone in Unity.
To make it work, I have to bring in Unity the whole generated src folder, including the Type.cs file.
However, when I import the "Post Processing Stack" (a basic Unity extension) I get errors due to name Conflicts. The Type class is also a basic C# class and It is used by the Post Processing scripts.
The haxe-Type takes priority and breaks the compilation:
Assets/PostProcessing/Runtime/PostProcessingBehaviour.cs(406,30): error CS1502: The best overloaded method match for `System.Collections.Generic.Dictionary<Type,System.Collections.Generic.KeyValuePair<UnityEngine.Rendering.CameraEvent,UnityEngine.Rendering.CommandBuffer>>.Add(Type, System.Collections.Generic.KeyValuePair<UnityEngine.Rendering.CameraEvent,UnityEngine.Rendering.CommandBuffer>)' has some invalid arguments
Assets/PostProcessing/Runtime/PostProcessingBehaviour.cs(406,34): error CS1503: Argument `#1' cannot convert `System.Type' expression to type `Type'
I don't know if it is possible to solve this issue by playing around with C#/Unity/Mono search paths.
I as wondering wether it is more appropriate to (optionally) wrap all haxe top-level classes into the haxe namespace, or a special haxe-defaultnamespace, or prefix them for example to class HType.
Name conflicts for this basic types are likely to emerge in many other contexts, not only in Unity.
I found the solution in the Haxe documentation for C#:
https://github.com/HaxeFoundation/HaxeManual/wiki/Haxe-C%23
-D no-root generate package-less haxe types in the haxe.root namespace to avoid conflicts with other types in the root namespace
This way, all the classes that were at global level will be generated under namespace haxe.root.
I've seen that some projects used _ function that takes string as an argument, like _("Hello World"). But I couldn't find any manuals or articles about what is it and how to use it.
I guess this has something to do with i18n and l10n (it was mentioned in some article I found on the internet), but can you explain to me how it works and how to use it?
That is the GNU gettext localization function. You can provide language specific alternate strings for the one specified in the function call.
There is the xgettext tool, which generates a .pot file (abbreviation for portable object template) from your application code, then translators can make .po localization files for it. Then, you can bundle these with your application, and deliver a more widely usable piece of software.
I18n. See gettext example here: https://ewgeny.wordpress.com/2012/05/10/supporting-multiple-languages-in-your-application-a-simple-gettext-step-by-step-example/
Also found some info about what exactly this function do, it seems to be the macro for Glib.dgettext() function in Vala, this is from valadoc.org:
dgettext
public unowned string dgettext (string? domain, string msgid)
This function is a wrapper of dgettext which does not translate the message if the default domain as set with textdomain has no translations for the current locale.
...
Applications should normally not use this function directly, but use the _ macro for translations.
I'm looking for an Actionscript equivalent for Python / PHP / etc.'s eval() function, which dynamically executes code from an arbitrary string.
There is no native eval() function. I see only one hack to do it : create a bytecode at runtime and load it. If you really need it, there are some cool libs that will do it for you :
http://eval.hurlant.com/
http://code.google.com/p/as3scriptinglib/
I need to pass in a string that gets evaluated at runtime. So I can write this:
var foo = someEvalMethod ( "dataObject.someValue" )
instead of:
if ( argIn == "dataObject.someValue")
var foo = dataObject.someValue
}
Does anyone have an opinion on the following evaluate libraries, or better ones for AS3? Thanks:
AS3 eval by hurlant:
http://eval.hurlant.com/
D.eval by RIA 1:
http://www.riaone.com/products/deval/
As far as I know AS3 eval by hurlant is a "real" compiler. It parses code, generates bytecode and injects it to the Flash Player instance in use (through loadBytes() I guess).
D.eval has the same purpose but it does not generate bytecode, it parses expressions and execute them dynamically through its own API.
I see D.eval as a good candidate for what you are trying to achieve. It's not a full featured compiler, but it has enough APIs that cover many simple operations. Other than that it is a product that has a company behind, which is always a good guaranty.
Cheers!
1. Compiled Assembly from JSC
I've compiled what is intended to be client-side JavaScript using the JScript compiler (jsc.exe) on the server side in an attempt to make something that can be tested from a unit testing project, and maybe even something that can be debugged on the server side.
The compiled file contains only functions as follows (just for example) and it compiles fine into BitField.exe. Notice, no wrapper class or package in the source code.
------ BEGIN FILE (BitField.js) -------
function BitField(){
this.values = [];
}
// more functions ...
------- END FILE -------
jsc /fast- /out:BitField.exe Bitfield.js
Results in a BitField.exe assembly.
Success! Well, kind of ....
2. Testing Assembly / Access Point?
Secondly I've created a test project (in C#) and referenced in the BitField.exe assembly successfully. (The type of project is irrelevant but I'm providing more description to paint a full picture.)
The problem seems to be: I cannot find the namespace or a point at which I can access the BitField functions inside the BitField.exe assembly from my C# test project. The assembly doesn't seem to be a "normal".
In other words I need in C#
using ???WHAT???
Note: I don't want to use JScript "extensions", meaning keywords that won't run client-side (in a web browser), for example, class, package etc because I want the code to be clean as possible for copy & paste back into client side script environment (Regardless said "clean" code compiles fine by jsc.exe without use of those extensions). When I try to wrap the functions in package and class it starts producing compile errors so that's another reason not to use them - because they appear to make me alter my code.
Any suggestions as to how I can use the functions of the compiled JScript assembly (by having it referenced into another assembly) when there are no explicit containers in it?
Update / Proof
.NET Reflector view
After playing around with it for a while, and trying various combinations of command-line switches for jsc.exe, I'm pretty sure that what you're trying to do won't work as you'd wish it to. If you try to compile a js file that contains functions into a .Net library assembly, you get an error:
BitField.js(1,1) : error JS1234: Only type and package definitions are allowed inside a library
But, there is hope, yet! Here's what I would do...
I would keep your "clean" BitField.js file just as it is, and then create a batch file that wraps it in a JScript class and writes it out to a "dirty" js file. It's pretty clean if you think of it as part of the compilation of the code into the DLL. The code to wrap the BitField.js into BitFieldClass.js would look like this:
merge-into-class.js
var fso = new ActiveXObject("Scripting.FileSystemObject");
var ForReading = 1;
var inputFile = fso.OpenTextFile("BitField.js",ForReading, false);
var outputFile = fso.CreateTextFile("BitFieldClass.js", true);
outputFile.write("class BitFieldClass{\n");
while (!inputFile.AtEndOfStream)
{
var textLine = inputFile.ReadLine();
outputFile.write (textLine + "\n");
}
outputFile.write("}");
outputFile.close();
Then the batch file to wrap it and compile it is really simple:
compile-js.bat
cscript merge-into-class.js
jsc /t:library /out:BitFieldClass.dll bitFieldClass.js
Of course, if you wanted to do multiple files, you'd have to parameterize things a bit, but hopefully this is enough to demonstrate the idea.