(guile.info.gz) SRFI-10
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39.9 SRFI-10 - Hash-Comma Reader Extension
==========================================
The module `(srfi srfi-10)' implements the syntax extension `#,()',
also called hash-comma, which is defined in SRFI-10.
The support for SRFI-10 consists of the procedure
`define-reader-ctor' for defining new reader constructors and the read
syntax form
#,(CTOR DATUM ...)
where CTOR must be a symbol for which a read constructor was defined
previously, using `define-reader-ctor'.
Example:
(define-reader-ctor 'file open-input-file)
(define f '#,(file "/etc/passwd"))
(read-line f)
=>
"root:x:0:0:root:/root:/bin/bash"
Please note the quote before the `#,(file ...)' expression. This is
necessary because ports are not self-evaluating in Guile.
-- Scheme Procedure: define-reader-ctor symbol proc
Define PROC as the reader constructor for hash-comma forms with a
tag SYMBOL. PROC will be applied to the datum(s) following the
tag in the hash-comma expression after the complete form has been
read in. The result of PROC is returned by the Scheme reader.
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