FELIX OPERATORS

Felix operators and operator names (these need to be checked!).

A chainable binary operator such as + creates a list of subexpressions.

Assignment operators are sugar for statements, so only one is allowed.

= asgn
<- asgn
:= initialise new val
+= pluseq
-= minuseq
*= muleq
/= diveq
%= modeq
|= oreq
^= xoreq
&= andeq

let <expr> in <expr> prefix

, chain

Note that "shortcut" doesn’t apply in Felix since expressions are purely functional.

|| lor chain
&& land chain
! lnot prefix

== eq binary
<= le chain
< lt chain
>= ge chain
> gt chain
<> ne chain
!= ne chain

-> arrow left assoc

case <int> of <int> unassoc

Note that + has a lower precedence than -, and * has a lower precedence than / which is unusual.

- sub left assoc
+ add chain
* mul chain
/ div left assoc
% mod left assoc
- sub prefix
+ sub prefix
** pow right (special prec rules)

& prefix
* prefix

| bor chain
^ xor chain
& band chain
~ bnot prefix

(juxtaposition) left assoc

: left assoc

. left assoc

:: left assoc

of left assoc

if/then/else/endif

match <expr> with
| <pattern> => <expr>
...
endmatch

regmatch <expr> with
| <regexp> => <expr>
...
endmatch

(fun (<arglist>):<type> = { <expr> })
(fun (<arglist>):<type> = { <statements> })
{ <expr> }
Lambda function. The return type is optional. The third form is short for (fun () = { <expr> })

(proc (<arglist>){ <statements> })
{ <statements> }
Lambda procedure. The second form is short for (proc () = { <statements> })

1.1.1

felix(1) for a language introduction and man page index
flx(1) for a list of the tools.
flxcc(1) for a description of the wrapper generator tool.
flx_lit(1) for a description of literals
flx_op(1) for a list of operators
flx_cop(1) for a list of C operator precedence names
flx_key(1) for a list of keywords
flx_grammar(1) for a grammar summary
flx_lib_typ(1) for a list of library types
flx_dir(1) for a list of directives
flx_exec(1) for a list of executable statements
flx_decl(1) for a list of declarative statements
flx_bind(1) for a list of binding statements

See http://felix.sourceforge.net

John Maxwell Skaller, mailto:skaller@users.sourceforge.net