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137 lines
4.8 KiB
Scheme
137 lines
4.8 KiB
Scheme
;; Copyright (C) 2015
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;; "Mu Lei" known as "NalaGinrut" <NalaGinrut@gmail.com>
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;; This file is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; This file is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with this program. If not, see <http://www.gnu.org/licenses/>.
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(library (pcre)
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(export new-pcre
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pcre-match
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pcre-get-substring
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pcre-search)
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(import (guile) (rnrs) (system foreign)))
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(define (make-blob-pointer len)
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(bytevector->pointer (make-bytevector len)))
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(define pcre-ffi (dynamic-link "libpcre"))
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(define %pcre-compile2
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(pointer->procedure '*
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(dynamic-func "pcre_compile2" pcre-ffi)
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(list '* int '* '* '* '*)))
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(define %pcre-compile
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(pointer->procedure '*
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(dynamic-func "pcre_compile" pcre-ffi)
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(list '* int '* '* '*)))
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(define %pcre-exec
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(pointer->procedure int
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(dynamic-func "pcre_exec" pcre-ffi)
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(list '* '* '* int int int '* int)))
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(define %pcre-study
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(pointer->procedure '*
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(dynamic-func "pcre_study" pcre-ffi)
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(list '* int '*)))
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(define %pcre-get-substring
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(pointer->procedure '*
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(dynamic-func "pcre_get_substring" pcre-ffi)
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(list '* '* int int '*)))
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(define %pcre-free
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(pointer->procedure void
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(dynamic-func "pcre_free" pcre-ffi)
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(list '*)))
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(define %pcre-free-study (dynamic-func "pcre_free_study" pcre-ffi))
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(define %pcre-free-substring (dynamic-func "pcre_free_substring" pcre-ffi))
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(define-record-type pcre
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(fields
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errptr
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(mutable strptr)
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(mutable ovector)
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(mutable matched)
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(mutable code)
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(mutable extra)))
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(define (%new-pcre)
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(make-pcre (make-blob-pointer (sizeof ptrdiff_t)) ; errptr
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#f #f 0 #f #f))
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(define* (new-pcre re #:optional (options 0))
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(let ((reptr (string->pointer re))
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;;(errcodeptr (make-blob-pointer int))
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(erroffset (make-blob-pointer int))
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(tableptr %null-pointer)
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(pcre (%new-pcre)))
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;; FIXME: add exception handling
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(pcre-code-set! pcre (%pcre-compile reptr options (pcre-errptr pcre)
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erroffset tableptr))
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;;(set-pointer-finalizer! (pcre-code pcre) %pcre-free)
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pcre))
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(define* (pcre-match pcre str #:key (study-options 0) (exec-options 0)
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(ovecsize 30) (offset 0))
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(let ((extra (%pcre-study (pcre-code pcre) study-options (pcre-errptr pcre)))
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(strptr (string->pointer str))
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(ovector (make-blob-pointer (* int ovecsize))))
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(pcre-matched-set! pcre
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(%pcre-exec (pcre-code pcre)
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extra
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strptr
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(string-length str)
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offset
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exec-options
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ovector
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ovecsize))
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(pcre-ovector-set! pcre ovector)
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(pcre-strptr-set! pcre strptr)
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(set-pointer-finalizer! extra %pcre-free-study)
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pcre))
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(define (pcre-get-substring pcre index)
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(let ((strptr (pcre-strptr pcre))
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(ovector (pcre-ovector pcre))
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(matched (pcre-matched pcre))
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(buf (make-blob-pointer (sizeof ptrdiff_t))))
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(%pcre-get-substring strptr ovector matched index buf)
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(let ((ret (pointer->string (dereference-pointer buf))))
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(set-pointer-finalizer! (dereference-pointer buf) %pcre-free-substring)
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ret)))
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(define* (pcre-search pcre str #:key (study-options 0) (exec-options 0)
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(exclude " "))
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(define (trim s)
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(string-trim-both s (lambda (x) (string-contains exclude (string x)))))
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(define len (string-length str))
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(let lp((i 0) (ret '()))
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(cond
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((>= i len) (reverse ret))
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(else
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(pcre-match pcre str #:study-options study-options #:exec-options exec-options #:offset i)
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(if (<= (pcre-matched pcre) 0)
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(lp len ret)
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(let ((hit (trim (pcre-get-substring pcre 1)))
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(sublen (string-length (pcre-get-substring pcre 0))))
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(if (zero? sublen)
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(lp len ret)
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(lp (+ i sublen) (cons hit ret)))))))))
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(define (pcre-free pcre)
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(and (not (null-pointer? (pcre-code pcre)))
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(%pcre-free (pcre-code pcre))))
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