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author | Bryan Newbold <bnewbold@robocracy.org> | 2017-02-20 00:05:25 -0800 |
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committer | Bryan Newbold <bnewbold@robocracy.org> | 2017-02-20 00:05:25 -0800 |
commit | 8ffbc2df0fde83082610149d24e594c1cd879f4a (patch) | |
tree | a2be9aad5101c5e450ad141d15c514bc9c2a2963 /ppfile.scm | |
download | slib-8ffbc2df0fde83082610149d24e594c1cd879f4a.tar.gz slib-8ffbc2df0fde83082610149d24e594c1cd879f4a.zip |
Import Upstream version 2a6upstream/2a6
Diffstat (limited to 'ppfile.scm')
-rw-r--r-- | ppfile.scm | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/ppfile.scm b/ppfile.scm new file mode 100644 index 0000000..4b21b6e --- /dev/null +++ b/ppfile.scm @@ -0,0 +1,70 @@ +;;;; "ppfile.scm". Pretty print a Scheme file. +;Copyright (C) 1993, 1994 Aubrey Jaffer +; +;Permission to copy this software, to redistribute it, and to use it +;for any purpose is granted, subject to the following restrictions and +;understandings. +; +;1. Any copy made of this software must include this copyright notice +;in full. +; +;2. I have made no warrantee or representation that the operation of +;this software will be error-free, and I am under no obligation to +;provide any services, by way of maintenance, update, or otherwise. +; +;3. In conjunction with products arising from the use of this +;material, there shall be no use of my name in any advertising, +;promotional, or sales literature without prior written consent in +;each case. + +(require 'pretty-print) + +(define (pprint-filter-file inport filter . optarg) + ((lambda (fun) + (if (input-port? inport) + (fun inport) + (call-with-input-file inport fun))) + (lambda (port) + ((lambda (fun) + (let ((outport + (if (null? optarg) (current-output-port) (car optarg)))) + (if (output-port? outport) + (fun outport) + (call-with-output-file outport fun)))) + (lambda (export) + (let ((old-load-pathname *load-pathname*)) + (set! *load-pathname* inport) + (letrec ((lp (lambda (c) + (cond ((eof-object? c)) + ((char-whitespace? c) + (display (read-char port) export) + (lp (peek-char port))) + ((char=? #\; c) + (cmt c)) + (else (sx))))) + (cmt (lambda (c) + (cond ((eof-object? c)) + ((char=? #\newline c) + (display (read-char port) export) + (lp (peek-char port))) + (else + (display (read-char port) export) + (cmt (peek-char port)))))) + (sx (lambda () + (let ((o (read port))) + (cond ((eof-object? o)) + (else + (pretty-print (filter o) export) + ;; pretty-print seems to have extra newline + (let ((c (peek-char port))) + (cond ((eqv? #\newline c) + (read-char port) + (set! c (peek-char port)))) + (lp c)))))))) + (lp (peek-char port))) + (set! *load-pathname* old-load-pathname))))))) + +(define (pprint-file ifile . optarg) + (pprint-filter-file ifile + (lambda (x) x) + (if (null? optarg) (current-output-port) (car optarg)))) |