From Swftools

as3compile

as3compile is a stand alone compiler for ActionScript 3.0. It aims to be compatible with Adobe's Flex compiler

Also see the as3compile man page.

An example file for processing with as3compile:

// smiley.as

package
{
    import flash.display.MovieClip

    public class Main extends MovieClip
    {
        function Main()
        {
            this.graphics.beginFill(0xcccc00)
            this.graphics.drawCircle(200,200,200)
            this.graphics.endFill()
            this.graphics.beginFill(0x000000)
            this.graphics.drawCircle(140,150,50)
            this.graphics.drawCircle(260,150,50)
            this.graphics.drawRoundRect(140,270,120,10,20);
            this.graphics.endFill()
        }
    }
}

Compile this file using:

as3compile -X 400 -Y 400 smiley.as

Further reading

• Differences between as3compile and Flex
• ActionScript 3.0 Language Reference