57 lines
1.8 KiB
Hy
57 lines
1.8 KiB
Hy
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;;; Hy anaphoric macros
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;;
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;; Copyright (c) 2013 James King <james@agentultra.com>
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;;
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;; Permission is hereby granted, free of charge, to any person obtaining a
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;; copy of this software and associated documentation files (the "Software"),
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;; to deal in the Software without restriction, including without limitation
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;; the rights to use, copy, modify, merge, publish, distribute, sublicense,
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;; and/or sell copies of the Software, and to permit persons to whom the
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;; Software is furnished to do so, subject to the following conditions:
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;;
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;; The above copyright notice and this permission notice shall be included in
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;; all copies or substantial portions of the Software.
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;;
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;; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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;; IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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;; FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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;; THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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;; LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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;; FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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;; DEALINGS IN THE SOFTWARE.
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;;
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;;; These macros make writing functional programs more concise
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(defmacro ap-each [lst &rest body]
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`(foreach [it ~list] ~@body))
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(defmacro ap-each-while [lst pred &rest body]
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`(let [[p (lambda [it] ~pred)]]
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(foreach [it ~lst]
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(if (p it)
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~@body
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(break)))))
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(defmacro ap-map [form lst]
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`(let [[f (lambda [it] ~form)]]
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(foreach [v ~lst]
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(yield (f v)))))
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(defmacro ap-map-when [predfn rep lst]
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`(let [[f (lambda [it] ~rep)]]
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(foreach [it ~lst]
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(if (~pred it)
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(yield (f it))
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(yield it)))))
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(defmacro ap-filter [form lst]
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`(let [[pred (lambda [it] ~form)]]
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(foreach [val ~lst]
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(if (pred val)
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(yield val)))))
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