~/cstml/documents/space
The language.

Language Syntax
- Example Terms
Types Syntax
- Notation
  - Examples

A declarative, statically typed, stack programing language. Inspired by the FMC, FMCt, and Forth.

Language Syntax

NB: This page is marked as WIP

The syntax of space is simple:

TERM     ::= *
           | VARIABLE ; TERM
           | @LOCATION [TERM] ; TERM
           | @LOCATION <VARIABLE : TYPE> ; TERM

VARIABLE ::= <lower case letter>

LOCATION ::= @ <upper case letter>+ <lower case letter>*

TYPE     ::= <upper case letter>+ <lower case letter>*

The language also accommodates nested comments, in the same style as Haskell:

-- Line comments are lines preppended with --
{- Multi-line nested comments {- as can be seen here -} are of this
  form.  -}

Example Terms

x;*         -- is simply calling variable x
x;y;*       -- is calling variable x and then y
[x;*];*     -- pushses a call to variable x to the default/"Home" stack
[x;*];<y>;* -- pushes a call to variable x to the default stack and then binds this command to variable y

eval(x) = eval(eval(x))

Types Syntax

There are two levels of types: values and types.

Any type is a set of Values or Constructors.

()    :: ()
1     :: Z

^()   :: {}       -> ({1})@
^1    :: {}       -> ({Z})@
^1;^2 :: {}       -> ({Z;Z})@
+     :: ({Z;Z})@ -> {}

[*];<x>;eval ::

Notation

T ::= {}
    | TYPEVAR      ; T
    | Z            ; T
    | Ch           ; T
    | 5.{T}        ; T
    | [T -> T]     ; T
    | (T)@LOCATION ; T

Examples

x
Z
({} -> Z)@
{} -> ({} -> Z)@

Z  :: {} => gamma@[{} => Z]
1  :: {} => gamma@[{} => Z]

~/cstml/documents/space The language.