File Breakdown

Folders and Files

##/accessibleblockly

• speech.js - Handles everything that needs to be read by the screen reader.
• menu_nav.js - Handles navigating the menu using WASD,attaching readable strings to the blocks, and reading the menu blocks.
• navigation.js - Navigating between the blocks in the workspace.
• tree_view.js - Creates, navigates and displays comment/info boxes.
• keystrokes.js - Handles key input.
• in_block.js - Allows the user to edit individual blocks.
• accessibility.js - Used for opening and closing the flyout menu.

##/tests

• interface.html - The interface used for Accessible Blockly.
• playground.html - The default Blockly interface.
• /quick_reference - Help pages for all blocks in Blockly as well as a hotkey glossary.

/core

• block.js - The class resembling one block.
• block_svg.js - Methods for graphically rendering a block as SVG. Handles snap to grid.
• blockly.js - Core JavaScript library for Blockly, defines value types of blocks.
• blocks.js - Flexible templating system for defining blocks.
• bubble.js - Object representing a UI bubble.
• comment.js - Object representing a code comment.
• connection.js - Components for creating connections between blocks.
• contextmenu.js - Functionality for the right-click context menus.
• css.js - Inject Blockly's CSS synchronously.
• field.js - Input field. Used for editable titles, variables, etc. This is an abstract class that defines the UI on the block. Actual instances would be Blockly.FieldTextInput, Blockly.FieldDropdown, etc.
• field_angle.js - Angle input field.
• field_checkbox.js - Checkbox field. Checked or not checked.
• field_colour.js - Colour input field.
• field_date.js - Date input field.
• field_dropdown.js - Dropdown input field. Used for editable titles and variables. In the interests of a consistent UI, the toolbox shares some functions and properties with the context menu.
• field_image.js - Image field. Used for titles, labels, etc.
• field_label.js - Non-editable text field. Used for titles, labels, etc.
• field_textinput.js - Text input field.
• field_variable.js - Variable input field.
• flyout.js - Handles dragging blocks onto the screen.
• generator.js - Utility functions for generating executable code from Blockly code.
• icon.js - Object representing an icon on a block.
• inject.js - Functions for injecting Blockly into a web page.
• input.js - Object representing an input (value, statement, or dummy).
• msg.js - Core JavaScript library for Blockly.
• mutator.js - Object representing a mutator dialog. A mutator allows the user to change the shape of a block using a nested blocks editor.
• names.js - Utility functions for handling variables and procedure names.
• procedures.js - Utility functions for handling procedures.
• realtime.js - Common support code for Blockly apps using real-time collaboration.
• realtime-client-utils.js - Common utility functionality for Google Drive Realtime API, including authorization and file loading. This functionality should serve mostly as a well-documented example, though is usable in its own right.
• scrollbar.js - Library for creating scrollbars.
• toolbox.js - Toolbox from whence to create blocks, sets up the UI using treenodes. Also handles keyboard navigation through the UI.
• tooltip.js - Library to create tooltips for Blockly.
• trashcan.js - Object representing a trash can icon.
• utils.js - Utility methods. These methods are not specific to Blockly, and could be factored out into a JavaScript framework such as Closure.
• variables.js - Utility functions for handling variables.
• warning.js - Object representing a warning.
• widgetdiv.js - A div that floats on top of Blockly. This singleton contains temporary HTML UI widgets that the user is currently interacting with. E.g. text input areas, colour pickers, context menus.
• workspace.js - Object representing a workspace.
• workspace_svg.js - Object representing a workspace rendered as SVG.
• xml.js - XML reader and writer.

/blocks

• There is one file for each of the categories of blocks, each is named accordingly except functions which is named procedures.js.
• This is where the accessible mutators are made

/generators

• python.js, javascript.js - translate each block into code in the respective language.

closure/goog/a11y/aria

Google's implementation of WAI-Aria functions