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SRFI-105 is now in Guile!


From: Mark H Weaver
Subject: SRFI-105 is now in Guile!
Date: Fri, 26 Oct 2012 21:51:22 -0400

Hello all,

I'm pleased to announce that Guile's built-in reader (on the stable-2.0
branch) now includes full support for SRFI-105 curly-infix expressions.
To use it, simply put "#!curly-infix" in a code (or data) file before
the first use of curly-infix notation.

See <http://srfi.schemers.org/srfi-105/srfi-105.html> for details, but
here are some examples:

     #!curly-infix

     {n <= 5}                =>  (<= n 5)
     {{a > 0} and {b >= 1}}  =>  (and (> a 0) (>= b 1))
     {a + b + c}             =>  (+ a b c)
     {a * {b + c}}           =>  (* a (+ b c))
     {(- a) / b}             =>  (/ (- a) b)
     {-(a) / b}              =>  (/ (- a) b) as well
     {(f a b) + (g h)}       =>  (+ (f a b) (g h))
     {f(a b) + g(h)}         =>  (+ (f a b) (g h)) as well
     '{a + f(b) + x}         =>  '(+ a (f b) x)
     {length(x) >= 6}        =>  (>= (length x) 6)
     {n-1 + n-2}             =>  (+ n-1 n-2)
     {n * factorial{n - 1}}  =>  (* n (factorial (- n 1)))
     {f{n - 1}(x)}           =>  ((f (- n 1)) x)
     {a . z}                 =>  ($nfx$ a . z)
     {a + b - c}             =>  ($nfx$ a + b - c)
     {f[a b] + g(h)}         =>  (+ ($bracket-apply$ f a b) (g h))

For those who are skeptical, I would encourage you to read the spec with
an open mind.  Unlike most previous infix proposals, SRFI-105 preserves
the special properties of s-expressions that make them so powerful.
Most notably, curly-infix expressions are _generic_ (the notation does
not depend on an underlying semantic) and _homoiconic_ (the underlying
data structure is clear from the syntax).

    Enjoy!
     Mark



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