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3 points by stefano 6082 days ago | link | parent

CL reader is highly extendable and you can tell it to be case sensitive: (setf (readtable-case readtable) 'sensitive), if I remember correctly. It's possible, I think, to use it to read Arc code.


1 point by eds 6082 days ago | link

Is this portable?

But assuming it works in some form or other, it should remove most of the need to write a custom reader. Though there is still the issue of (for example) complex number syntax, etc.

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3 points by stefano 6082 days ago | link

It's in the standard (CLTL2). You can fix everything, because you can tell the reader to use your own functions on particulars characters, as an example this is a piece of code that lets you use Arc [... _ ...] syntax in Common Lisp:

(defun read-square (stream c) (declare (ignore c)) (let ((body (read-delimited-list #\] stream t))) `#'(lambda (_) ,body)))

(set-macro-character #\] #'(lambda (x y) (declare (ignore x y)) (values))) (set-macro-character #\[ #'read-square)

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