https://github.com/mrspeaker/itsbasic

It's BASIC
https://github.com/mrspeaker/itsbasic

Last synced: 14 days ago
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It's BASIC

• Host: GitHub
• URL: https://github.com/mrspeaker/itsbasic
• Owner: mrspeaker
• Created: 2015-08-31T17:25:43.000Z (about 9 years ago)
• Default Branch: master
• Last Pushed: 2015-10-12T14:41:03.000Z (about 9 years ago)
• Last Synced: 2024-10-10T22:48:46.614Z (about 1 month ago)
• Language: JavaScript
• Size: 352 KB
• Stars: 2
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# ItsBasic

It's basic.

![co6ap4vweam4dmx](https://cloud.githubusercontent.com/assets/129330/9934191/bf63ba48-5d1d-11e5-9f0f-9b36b2d3e987.png)

To run:

    npm start

To test:

    npm test

##  Implemented:

    \# TEXT // comment

    x = 1

    x = y + 1

    == <> < > >= <=

    print "msg"

    print "msg", x, y

    goto 10

    if x < 10 then 20

    poke addr, value

    poke 2042, 1 // first screen char is A

    poke 3042, 2 // first scrren char background col is red

    peek 2042 // read the address

    rnd 20 // random int between 0 and 19

    data 1,2,3,4 // puts data into memory (writeLoc)

    read() //  reads data from memory (readLoc ) read must happen after data.

    cos, sin, tan, atan2

    mod

    con // console.log variable

    cls() // clear screen

    run

    list

    cls

    load // load "$" for listing

    save // loast on refresh!

    // Extrernal refs: only works in current game room.

    get // interact with world: get(, "")

    get // interact with world: get(, "", )

----

## Problems

* can't have a line longer than 1 screen (no wrapping)

* need an insert key

* return from rom binding only handles last statement.

* several variable look-ups in a row crash things: "10 a a a a a"

* 10 goto 10 locks up browser.  

---

## Thinkin'

* move more towards QBasic drawing... better for the game.

have types? %, $?

---

## next todos:

* can't have ? in strings.

* write tests for parse

* write tests for eval

* runstop/restore (double escape?)

* for loop

* set sprite data

* if x < 10 then EXPR

* input (keys)

* shortcuts for pokes for sprites etc. // Eh, just do QBasic!

  - eg, poke 2042, 1 === spron 1, 1

  - eg, poke 2042, 0 === spron 1, 0

* scrolling

---

## Mem locations

    0: background color

    1: foreground color

    2: data read location

    3: data write location

    4: screen cursor position

    5: current program line

    1000: sprites on/off

    1021: sprite x, y

    2042: screen char memory

    3042: screen back color

    4042: screen forecolor

    5000: default data location

# Notes

    * some ascii symbols? standard ascii.

    cols: 0-15

    screen memory: char Wx char H x ascii size. peek to get value

    color memory: charW x charH x cols. peek to get value

    gfx memory: WxHxcols

    program data:

    vars:a-z

    types: number, string, array, function

    numSprites

    sprite enable bit: numSprites

    sprite color: numSprites, cols

    sprite data pointer: hmmm.

    sprite pos x:

    sprite pos y:

    sprite scale:

    sprite rotate?

    sprite collisions

    poke, peek

    read, data, restore

    time, date

    cls

    for, next, if then else

    not or and xor

    math funcs... / + - * = < > sin cos atan2

    exp, mod

    input

    rect? circle? line? yeah!

    gosub?

    list, rnd,

    save, load

    stop

    prog:

    curLine: 0

    lines: []

    stack: []

    env: {}