121 lines
4.0 KiB
Scheme
121 lines
4.0 KiB
Scheme
;;; Ikarus Scheme -- A compiler for R6RS Scheme.
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;;; Copyright (C) 2006,2007,2008 Abdulaziz Ghuloum
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;;;
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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 General Public License version 3 as
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;;; published by the Free Software Foundation.
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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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;;; General Public License for more details.
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;;;
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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 (ikarus codecs)
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(export latin-1-codec utf-8-codec utf-16-codec native-eol-style
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make-transcoder native-transcoder buffer-mode?
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transcoder-codec transcoder-eol-style
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transcoder-error-handling-mode)
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(import
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(except (ikarus) latin-1-codec utf-8-codec utf-16-codec
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native-eol-style make-transcoder native-transcoder
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buffer-mode? transcoder-codec
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transcoder-eol-style transcoder-error-handling-mode)
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(ikarus system $transcoders))
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(define (latin-1-codec) 'latin-1-codec)
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(define (utf-8-codec) 'utf-8-codec)
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(define (utf-16-codec) 'utf-16-codec)
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(define (native-eol-style) 'none)
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(define error-handling-mode-alist
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'([ignore . #b01]
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[raise . #b10]
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[replace . #b11]))
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(define error-handling-mode-mask #b11)
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(define eol-style-alist
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'([none . #b00000]
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[lf . #b00100]
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[cr . #b01000]
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[crlf . #b01100]
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[nel . #b10000]
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[crnel . #b10100]
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[ls . #b11000]))
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(define eol-style-mask #b11100)
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(define codec-alist
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'([latin-1-codec . #b0100000]
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[utf-8-codec . #b1000000]
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[utf-16-codec . #b1100000]))
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(define codec-mask #b11100000)
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(define (rev-lookup n ls)
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(cond
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[(null? ls) #f]
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[(= (cdar ls) n) (caar ls)]
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[else (rev-lookup n (cdr ls))]))
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(define (codec->fixnum x who)
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(cond
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[(assq x codec-alist) => cdr]
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[else (die who "not a valid coded" x)]))
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(define (eol-style->fixnum x who)
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(cond
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[(assq x eol-style-alist) => cdr]
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[else (die who "not a valid eol-style" x)]))
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(define (error-handling-mode->fixnum x who)
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(cond
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[(assq x error-handling-mode-alist) => cdr]
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[else (die who "not a valid error-handling mode" x)]))
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(define make-transcoder
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(case-lambda
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[(codec eol-style handling-mode)
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($data->transcoder
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(fxior
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(error-handling-mode->fixnum handling-mode 'make-transcoder)
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(eol-style->fixnum eol-style 'make-transcoder)
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(codec->fixnum codec 'make-transcoder)))]
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[(codec eol-style)
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(make-transcoder codec eol-style 'replace)]
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[(codec)
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(make-transcoder codec 'none 'replace)]))
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(define (native-transcoder)
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(make-transcoder 'utf-8-codec 'none 'replace))
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(define (transcoder-codec x)
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(define who 'transcoder-codec)
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(if (transcoder? x)
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(let ([tag (fxlogand ($transcoder->data x) codec-mask)])
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(or (rev-lookup tag codec-alist)
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(die who "transcoder has no codec" x)))
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(die who "not a transcoder" x)))
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(define (transcoder-eol-style x)
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(define who 'transcoder-eol-style)
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(if (transcoder? x)
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(let ([tag (fxlogand ($transcoder->data x) eol-style-mask)])
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(or (rev-lookup tag eol-style-alist)
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(die who "transcoder has no eol-style" x)))
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(die who "not a transcoder" x)))
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(define (transcoder-error-handling-mode x)
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(define who 'transcoder-error-handling-mode)
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(if (transcoder? x)
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(let ([tag (fxlogand ($transcoder->data x) error-handling-mode-mask)])
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(or (rev-lookup tag error-handling-mode-alist)
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(die who "transcoder has no error-handling mode" x)))
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(die who "not a transcoder" x)))
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(define (buffer-mode? x)
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(and (memq x '(none line block)) #t))
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)
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