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# JsScript - Reference Documentation

Class implementing support for compiling and running script fragments

## Index of Methods

- JsScript() constructor
- newDynamicScope()
- execute()

## Constructor

### Prototype

JsScript(String filename)

JsScript(String filename, Number lineno, String source)

### Description

Compile script.

### Arguments

Type | Name | Description
--- | --- | ---
`String` | filename | Name of file containing the script
`Number` | lineno | Starting line number (1 = first line)
`String` | source | The source code

### Exceptions

Name | Value | Description
--- | --- | ---
GPError | GPError.ARGUMENTS_MISSING | Too few arguments in call
GPError | GPError.INVALID_ARGUMENTS | Too many arguments in call
GPError | GPError.INVALID_TYPE | Type of argument is invalid for call

### Example

    var scriptsource = 'globalvar = 123; var localvar = 456;function f() { return 1};';

    var s = new JsScript("sample", 1, scriptsource);

## newDynamicScope()

### Prototype

void newDynamicScope(String constructor)

### Description

Create a new dynamic scope using the given constructor function.

A dynamic scope inherits all predefined top level functions and properties, but is otherwise a clean top level scope. Use this to create a runtime environment to execute scripts.

### Arguments

Type | Name | Description
--- | --- | ---
`String` | constructor | The name of the constructor function for the scope

### Return

`Object` | A new dynamic scope derived from the top level scope

### Exceptions

Name | Value | Description
--- | --- | ---
GPError | GPError.ARGUMENTS_MISSING | Too few arguments in call
GPError | GPError.INVALID_ARGUMENTS | Too many arguments in call
GPError | GPError.INVALID_TYPE | Type of argument is invalid for call

### Example

    var scope = JsScript.newDynamicScope("Object");

## execute()

### Prototype

Object execute(Object scope)

Object execute(Object scope, String cwd)

### Description

Execute script within the defined scope object.

The caller may specify a current working directory (cwd) which is used when executing the script. If not specified, then the current working directory of the calling script is used.

### Arguments

Type | Name | Description
--- | --- | ---
`Object` | scope | The top level scope object for script execution.
`Object` | cwd | The current working directory to use.

### Return

`Object` | The result of evaluating the script, i.e. the last assignment or function return in the code.

### Exceptions

Name | Value | Description
--- | --- | ---
GPError | GPError.ARGUMENTS_MISSING | Too few arguments in call
GPError | GPError.INVALID_ARGUMENTS | Too many arguments in call
GPError | GPError.INVALID_TYPE | Type of argument is invalid for call

### Example

    s.execute(scope);

    assert(typeof(globalvar) == "undefined");
    assert(typeof(scope.globalvar) != "undefined");

    var thisdir = GPSystem.mapFilename("", GPSystem.CWD);
    var subdir = GPSystem.mapFilename("scriptdir", GPSystem.CWD);

    var s = new JsScript(subdir + "/test.js");

    // Execute script with current directory of this script
    // The script will set the global variable cwd
    s.execute(this);
    assert(thisdir == cwd);

    // Execute script with subdirectory relative to this script
    s.execute(this, subdir);
    assert(subdir == cwd);

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