DosWorld / tmbasic

TMBASIC programming language

TMBASIC

TMBASIC is a programming language for writing non-graphical programs. The modern BASIC language is easy for beginners to learn. Experienced programmers will find it familiar and productive after a brief glance at the cheat sheet.

TMBASIC is under development. Stay tuned!

• Documentation
  
• Cheat Sheet for Experienced Programmers

It's easy!

Easy to learn — The BASIC language will feel familiar to anyone with programming experience. New programmers will enjoy a cohesive, batteries-included learning experience. Everything you need to develop and distribute sophisticated apps is included in TMBASIC.

Easy to write — Developing a high-quality modern GUI requires professional-level expertise. Text-based apps have few options for visual effects, and even a novice can produce quality results.

Easy to share — TMBASIC apps are standalone executables that require no external library files. They can be copied and opened without installation. TMBASIC can cross-compile native executables targeting Windows, macOS, and Linux.

A taste of TMBASIC

dim a as Number
dim b as String
dim c as Boolean
dim d = 1.2345
dim e = "hello world!"
dim f = true

Declare variables with dim, providing either an explicit type or an initial value. The simple types are:

• Number — 128-bit decimal floating-point
• String — UTF-8 text
• Boolean — true or false

dim myList = [1, 2, 3]
dim combinedList = myList + [4, 5, 6] + 7

dim myMap as Map from Number to String
myMap(123) = "hello"
print ContainsKey(myMap, 123)  ' true

dim set mySet
    for i = 1 to 100 step 2
        yield i
    next
end dim

The collection types are:

• List of T — An ordered array of values of type T. List indices start at zero.
• Map from T1 to T2 — A dictionary with keys of type T1 and values of type T2.
• Set of T — A group of unique values of type T.

Use dim list, dim map, and dim set to build collections efficiently. Each yield statement adds an element to the collection.

These collection types are generic, but you can't define your own generic types.

dim d = DateFromParts(2021, 3, 12)
dim dt = DateTimeFromParts(2021, 3, 12, 4, 30, 0, 0)
dim tz = TimeZoneFromName("America/New_York")
dim offsets = UtcOffsets(dt, tz)
dim dto = DateTimeOffsetFromParts(2021, 3, 12, 4, 30, 0, 0, offsets(0))

The date and time types are:

• Date — A day without a time.
• DateTime — A date and local time without any time zone.
• DateTimeOffset — A date and local time with the time zone offset from UTC.
• TimeSpan — A duration of time.
• TimeZone — A time zone defined by the IANA.

type ExampleRecord
    foo as Number
    bar as String
end type

dim myAnonymousRecord1 as Record (foo as Number, bar as String)
dim myAnonymousRecord2 = { foo: 100, bar: "hello" }
dim myNamedRecord = myAnonymousRecord2 as ExampleRecord

Both anonymous and named record types are supported. The literal syntax for anonymous records resembles JavaScript. Anonymous records can be converted to named records with the as operator.

dim a = { foo: 1, bar: 2 }
dim b = a    ' makes a copy
b.foo = 999  ' a.foo is still 1

All types, including records and collections, have value semantics. There are no references or pointers. Assigning to a variable or passing to a function always makes a copy of the value.

sub Main()
    print Squared(5)
end sub

function Squared(x as Number) as Number
    return x * x
end function

Programs are broken down into functions and subroutines. A function returns a value to its caller. A subroutine does not return anything. Program execution begins in the Main subroutine.

Compatibility

Windows Vista or newer	64-bit • 32-bit
macOS 10.13 or newer	Intel • Apple Silicon
Linux 2.6.39 or newer	64-bit • 32-bit • ARM64 • ARM32
iOS	iSH Shell (Linux 32-bit)
Android	Termux (Linux ARM64)

License

TMBASIC is open source software that is available free of charge. TMBASIC builds your programs using many open source components. See a list of components here. These components have permissive and commercial-friendly licenses that you must obey when you publish your programs written in TMBASIC. When you build your program, TMBASIC produces a LICENSE.txt file for your convenience. Include this license file when sharing your TMBASIC apps.