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47 lines
1.8 KiB
47 lines
1.8 KiB
;; guile-csv transform
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;; Copyright (C) 2021
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;; Brady McDonough
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;; This program is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU Lesser General Public License as
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;; published by the Free Software Foundation; either version 3 of the
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;; License, or (at your option) any later version.
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;;
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;; This program is distributed in the hope that it will be useful, but
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;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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;; Lesser General Public License for more details.
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;;
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;; You should have received a copy of the GNU Lesser General Public
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;; License along with this program; if not, contact:
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;;
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;; Free Software Foundation, Inc. Voice: +1-617-542-5942
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;; 51 Franklin Street, Fifth Floor Fax: +1-617-542-2652
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;; Boston, MA 02110-1301, USA gnu@gnu.org
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(define-module (csv transform)
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#:use-module (ice-9 receive)
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#:use-module (sxml transform)
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#:export (bubble-term)
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#:re-export (pre-post-order))
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(define (key-contains-defer str)
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(lambda ($pair) (string-contains (symbol->string (car $pair)) str)))
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;; Generates a handler for pre-post-order.
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;; EXAMPLE USAGE:
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;; (pre-post-order $tree `(,(bubble-term rec "key-name")
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;; (*default* . ,(lambda x x))))
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;; This will generate a rule which travels in *preorder* to each record named
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;;'rec' and replace the rec symbol with the pair keyed as "key-name". The rest
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;;of the record will be a quoted list.
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(define-syntax bubble-term
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(syntax-rules ()
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((_ record-sym $str)
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`(record-sym *preorder* .
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,(lambda $record
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(let* (($lst (cadr $record)))
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(receive (head rest)
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(partition (key-contains-defer $str) $lst)
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(cons head `(',rest)))))))))
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