ScatterScript

A Simple Script Language

Build

• For Windows users: just open ScatterScript.sln in Visual Studio 2012 or higher version, and select Build Solution in menu BUILD
  And the development environment is Windows 7 Professional

• For Linux users: run the following 4 command in terminal

  mkdir build
  cd build
  cmake ..
  make
  

• For Mac OS X users: Open in Xcode 6.0 or higher, and build!

Grammar

• Like C language, you can use control structures: if...else, while, continue, break, but no for and switch

• In C language, you have a entry point: main function. It's the same in ScatterScript, but the entry point is _main function, which takes no parameter!

• Like JavScript, you can declare a variable by using keyword var, and define a fuction by using keyword func

• Data Type: Integer, Float-point number, String and Array
  Note: Array can not be initialized when you declare it. You can only initialize an array by doing so:

  var a[3];
  a[0] = 0;
  a[1] = "ddd";
  a[2] = 34;  
  // or using a while loop
  

• Example:

  func sum(end)
  {
      var start = 0;
      while (end > 0)
      {
    	  start += end;
    	  end -= 1;
      }
      return start;
  }
  
  func _main()
  {
      var out = sum(10);
      return 0;
  }
  

Built-In Function

• ssprint( out )
  print out to console. out can be a integer, float-number or string.
  hello-world example:

  func _main() {
      var out = "hello, world!";
      ssprint(out);
  
      return 0;
  }
  

• ssfopen( filename, mode)
  Like fopen in C language, filename is the file to open, mode is the open mode, which can be: "r", "r+", "w", "w+", "a", "a+", etc

• ssfgetc( file )
  read a character from the file

• ssfgets( file, count)
  read a line from file, or read count-1 characters

• ssfclose( file)
  close file

• ssfwrite( file, out)
  write out to file
  example:

  func _main() {
      var file = ssfopen("data", "r");
      var c = ssfgetc(file);
      while (c != false) {
          ssprint(c);
          c = ssfgetc(file);
      }
      return 0;
  }
  

  This example shows how to read a file and print out all its content to console

Usage

• CompileToExe:ss -c(-d) souce-file out-file(optional)

  • example: ss -c test.ss
    This will create the final byte-code test.sse
    Option -d means debug mode: generate a test.sse.info, which contains comment info for sse file

• CompileToAsm: ss -s souce-file out-file(optional)

  • example: ss -s test.ss
    This will create the equivalent assemble file test.ssam

• Assemble: ss -a asm-souce-file out-file(optional)

  • example: ss -a test.ssam main
    This will convert assemble file to the final byte-code main.sse.

• Run: ss sse-file

  • example: ss main.sse
    This will run executable file main.sse

Finally:

ScatterScript is just a toy language, when I try to get the prime number from 1-250000 by using the following code:

func _main() {
	var i = 2;
	var a = 2;
	var top = 250000;
	var cop = 500;
	while (i <= top) {
		a = 2;
		while (a <= cop) {
			if ((i % a == 0) && (i != a)) {
				a+=1;
				break;
			} else {
				if (a == cop) {
					ssprint(i);
					ssprint("\n");
				}
			}
			a+=1;
		}
		i+=1;
	}
	return 0;
}

ScatterScript takes 139.70s, however, CPython takes 7.17s and Nodejs only takes 1.36s