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How to use ReoScript to run JavaScript
Download ReoScript libraries or build from source code. The following two DLLs must be added as project reference.
- Antlr3.Runtime.dll
- Unvell.ReoScript.dll
And import this namespace:
using Unvell.ReoScript;
Create an instance of class ScriptRunningMachine, it managements the instances and memory during load/run scripts. (Learn more about ScriptRunningMachine)
ScriptRunningMachine srm = new ScriptRunningMachine();
Call Run
method to run script statements.
srm.Run("alert('hello world!');");
After execute above, a message box with text 'hello world' will be displayed.
There is a brief of difference between JavaScript and ReoScript:
-
GlobalObject named
_window_
in JavaScript, but named_script_
in ReoScript.window.hello = function() { }; // JavaScript script.hello = function() { }; // ReoScript
See about GlobalObject.
-
Iteration
for...in
works on Array and returns element itself.var arr = [1, 5, 'ok', false]; for (e in arr) { console.log(e); }
JavaScript returns index, but ReoScript returns element itself as below:
JavaScript: ReoScript: 0 1 1 5 2 ok 3 false
See about Enumerator.
-
setTimeout
andsetInterval
are supported to pass arguments.It is possible to pass arguments when calling
setTimeout
orsetInterval
, for example:function run(obj) { console.log('Object is ' + obj.name); } setTimeout(run, 1000, {name: 'obj1'});
See about Enhanced Async-Calling.
-
Argument list of a function is called
arguments
in JavaScript but called__args__
in ReoScript.JavaScript: ReoScript: function hello() { function hello() { console.log(arguments.length); console.log(__args__.length); } }
-
Regular Expressions currently is not supported. However, you can make an extension such as extended native function to support .NET Regular Expressions for script. (See How to extend function for script)
-
with
keyword is not supported in ReoScript. -
ReoScript provides several own features, see Language Feature.
See How to integrate ReoScript into your .NET Application.
In HTML and JavaScript we could use <script>
tag to import another script file into current page. It is also possible to implement the same effect in ReoScript by using import keyword.
Script File: common.rs
var MAX_PATH = 256; // global variable for all script files
function get_extension(filepath) {
var index = filepath.lastIndexOf('.');
return filePath.substr(index + 1);
}
Script File: main.rs
import "common.rs";
var ext = get_extension('sample.txt');
console.log('extension is ' + ext);
The result is:
extension is txt
You may also run a script from Windows Console by using ReoScript Runner. (See ReoScript Runner)