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Analysis

Overview

The goal of this task is to expose the Sophie book's model and Sophie's logic in a user-friendly way to the user.

Generally, there are two use-cases for scripting, which imply some differences in the requirements:

• Scripts used for automation
  • The result of their execution should be undoable, as each other change to the model
• Scripts as link targets
  • They have limited scope - for example, user cannot create a new book with them
  • There's no need to be undoable

Task requirements

• The user should have access to the current book and should be able to do the following actions with it:
  • get/set its title
  • get/set the page size (width and height)
  • get a list of all pages or a page with a given index
  • add a new page in it
  • remove a page
  • reorder the pages
  • get/set the current page
• For every page the user should be able to:
  • get/set its name
  • get its index (but not set it)
  • get the bounding rectangle (a rectangle that contains all page elements)
  • [Optional for this revision] get/set the background style
  • [Optional for this revision] get/set the border style
  • get a list of all frames
  • add a new frame
  • remove a frame
• For every frame the user should be able to:
  • get/set its size
  • get/set its z-order
  • get/set its content location
  • get/set its rotation angle
  • get/set its background style
  • get/set its border style
  • get/set its paddings
• [Optional] The user should also be able to work with groups.

• Allow scripts to be defined as link actions.
  • The action settings panel should contain a combo box with all available scripts for current book.

• Not all Java classes have to be exposed to Sophie scripts, because:
  • Some scripts can crash the application.
  • Some other scripts can allow crackers to execute malicious code.

• When closing a book, close any open document windows that display scripts from current book. Generally, when closing a document window, close all children resources' document windows.

Task result

• Source code

Implementation idea

• Decide whether to expose the model classes (org.sophie2.base.model.book.Book, org.sophie2.base.model.book.Page, org.sophie2.base.model.book.Frame, etc.) or to write facade classes.
  • The first approach will make scripts very powerful - the user will be able to do with them everything he/she can do with the application. In addition, it won't be necessary to update the facade every time we change something.
  • The second approach however will be more convenient for the user. It will also solve most of the security issues.

• To filter the access to some Java classes:

  context.setClassShutter(new ClassShutter() {
  	@Override
  	public boolean visibleToScripts(String fullClassName) {
  		return fullClassName.startsWith("org.mozilla.javascript");
  	}
  });
  

• The following lines add a global variable out that is a JavaScript reflection of the System.out variable:

  Object wrappedOut = Context.javaToJS(System.out, scope);
  ScriptableObject.putProperty(scope, "out", wrappedOut);
  

Related

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Design

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