102 lines
3.1 KiB
Scheme
102 lines
3.1 KiB
Scheme
;;
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;; util-parser.scm
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;;
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;; Common parts of the parsers.
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;;
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;; ISC License
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;;
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;; Copyright 2023 Brmlab, z.s.
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;; Dominik Pantůček <dominik.pantucek@trustica.cz>
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;;
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;; Permission to use, copy, modify, and/or distribute this software
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;; for any purpose with or without fee is hereby granted, provided
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;; that the above copyright notice and this permission notice appear
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;; in all copies.
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;;
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;; THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
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;; WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
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;; WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
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;; AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR
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;; CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
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;; OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
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;; NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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;; CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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;;
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(declare (unit util-parser))
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(module
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util-parser
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(
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parser-preprocess-line
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parser-parse-line
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parser-tests!
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)
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(import scheme
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(chicken base)
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(chicken irregex)
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testing)
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;; Pass 0: Removes any comments and removes any leading and trailing
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;; whitespace.
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(define (parser-preprocess-line line)
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(irregex-replace (irregex "[ \\t]*$" 'u)
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(irregex-replace (irregex "^[ \\t]*" 'u)
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(irregex-replace (irregex "#.*$" 'u) line "")
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"")
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""))
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;; Pass 1: Expects line with comments and surrounding whitespace
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;; removed, returns either #f if nothing was parsed, symbol if only
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;; one token was there and pair of symbol and string if both key and
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;; the value were present.
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(define (parser-parse-line line)
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(if (= (string-length line) 0)
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#f
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(let ((dm (irregex-search (irregex "[ \\t]" 'u) line)))
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(if dm
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(let* ((sep-idx (irregex-match-start-index dm))
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(key-str (substring line 0 sep-idx))
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(key (string->symbol key-str))
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(sep+val (substring line sep-idx))
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(val (irregex-replace (irregex "^[ \\t]*" 'u) sep+val "")))
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(cons key val))
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(string->symbol line)))))
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;; Self-tests
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(define (parser-tests!)
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(run-tests
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parser
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(test-equal? parser-preprocess-line
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(parser-preprocess-line "# all comment")
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"")
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(test-equal? parser-preprocess-line
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(parser-preprocess-line " # all comment after spaces")
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"")
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(test-equal? parser-preprocess-line
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(parser-preprocess-line " test # spaces and comment after spaces")
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"test")
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(test-equal? parser-preprocess-line
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(parser-preprocess-line "key value # spaces and comment after spaces")
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"key value")
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(test-false parser-parse-line
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(parser-parse-line ""))
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(test-eq? parser-parse-line
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(parser-parse-line "key")
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'key)
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(test-equal? parser-parse-line
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(parser-parse-line "key value")
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'(key . "value"))
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(test-equal? parser-parse-line
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(parser-parse-line "key value")
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'(key . "value"))
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(test-equal? parser-parse-line
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(parser-parse-line "key value and some")
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'(key . "value and some"))
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(test-equal? parser-parse-line
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(parser-parse-line "key value lot of spaces")
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'(key . "value lot of spaces"))
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))
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)
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