C2LC-21: Add Custom Commands to the Interpreter

Description

Modify the Interpreter to be able to run programs with Custom Commands.

Rename the existing Program type to CommandSequence and add a new Project type that includes Custom Commands:

export type CommandSequence = Array<string>;
export type Project = {
    customCommands: {
        [command: string]: CommandSequence
    },
    program: CommandSequence
};

Example project:

{
    customCommands: {
        square: ["forward", "left", "forward", "left", "forward", "left", "forward"]
    },
    program: ["square", "square"]
}

Test cases:

• Project with empty program and empty customCommands
• Project with program command sequence but no customCommands
• Project with program and customCommands
• Program with undefined commands (no registered command handlers or custom commands)
• Redefinition of built-in commands (command handlers)
• Recursion

See the discussion of command redefinition and recursion at https://wiki.fluidproject.org/display/C2LC/Custom+Blocks

We should also rename our existing editors to CommandSequence...Editor rather than Program...Editor as they operate on command sequences in our new model.

Comments

• Daniel Cho commented 2019-11-05T10:08:11.486-0500

  We need to think about how we are going to store custom commands – maybe web storage API if we are planning to store them locally, and I think it is valuable approach to make them sharable to other people too.

• Simon Bates commented 2019-11-05T10:32:16.085-0500

  Yeah, we'll definitely want to support persistence of custom commands and programs. I think we can tackle that a little later, when our program/project model is more evolved. In the overall project plan, we've got persistence scheduled for the next milestone: milestone 3 January-June 2020.

• Daniel Cho commented 2019-11-05T10:37:28.461-0500

  Yeah, I realized that I was thinking way ahead as well. That sounds great 👍