Support False

[edukisto]

Language

The author of the language is Wouter van Oortmerssen (@aardappel).

Any number of tabs, line feeds, and spaces are allowed between symbols.

Variables must have names from a to z. Uppercase and multicharacter names are disallowed.

Comments

• can be placed anywhere, but can’t be nested (parser seeks for a closing character until the first match);
• don’t allow escaping;
• can be empty;
• can be multiline;
• require a closing character even at the EOF.

Strings work exactly the same.

The " character can’t appear inside a string.

The { character can appear inside comments.

The } character can’t appear inside comments.

Tested with the Portable False Interpreter/Debugger v0.1 (1993).

Compatibility table of operators

Standard or implementation	(	)	<	B	D	O	®	ß	ø
Standards
False	-	-	-	-	-	-	-	+	+
False!	+	+	+	!	!	!	-	-	-
Strictly False	-	+	+	!	!	!	-	-	-
Implementations
68000 Assembler	-	-	-	-	-	-	-	+	+
ANS Forth	+	+	+	-	-	-	-	+	+
C	-	-	-	+	+	+	-	-	-
Forth	+	+	+	+	-	+	-	+	-
K (False!)	+	+	+	!	!	!	-	-	-
JavaScript (by Anthony Morphett)	-	-	-	!	!	!	+	=	+
JavaScript (by Ian Osgood)	=	=	=	-	-	-	-	=	+
Node.js	-	-	-	+	-	+	-	+	+
Red	-	-	-	-	-	-	-	+	+

Explanation:

! – detected as a variable;
+ – detected as an operator;
- – not detected;
= – detected as operator, but left implemented, commented, etc.

It is possible to provide a support for False! and Strictly False. The main problem is that False! supports uppercase variables (their names can overlap with non-standard B, D, O operators).

Additional resources

The False Programming Language. A site created by the author of the language.

The FALSE Programming Language (the original manual).

False 1.2b distribution (two implementations in 68000 Assembler and C).

False interpreter in JavaScript (by Anthony Morphett).

FALSE Language Interpreter (by Ian Osgood).

[edukisto]

I’ll do my best to make a PR on the weekend.

[edukisto]

There is also F. The language should not be confused with F and F*.