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876 lines
34 KiB
EmacsLisp
876 lines
34 KiB
EmacsLisp
;;; format.el --- read and save files in multiple formats
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;; Copyright (c) 1994, 1995, 1997 Free Software Foundation
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;; Author: Boris Goldowsky <boris@gnu.ai.mit.edu>
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;; This file is part of GNU Emacs.
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;; GNU Emacs 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 2, or (at your option)
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;; any later version.
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;; GNU Emacs 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 GNU Emacs; see the file COPYING. If not, write to the
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;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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;; Boston, MA 02111-1307, USA.
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;;; Commentary:
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;; This file defines a unified mechanism for saving & loading files stored
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;; in different formats. `format-alist' contains information that directs
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;; Emacs to call an encoding or decoding function when reading or writing
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;; files that match certain conditions.
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;;
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;; When a file is visited, its format is determined by matching the
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;; beginning of the file against regular expressions stored in
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;; `format-alist'. If this fails, you can manually translate the buffer
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;; using `format-decode-buffer'. In either case, the formats used are
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;; listed in the variable `buffer-file-format', and become the default
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;; format for saving the buffer. To save a buffer in a different format,
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;; change this variable, or use `format-write-file'.
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;;
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;; Auto-save files are normally created in the same format as the visited
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;; file, but the variable `auto-save-file-format' can be set to a
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;; particularly fast or otherwise preferred format to be used for
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;; auto-saving (or nil to do no encoding on auto-save files, but then you
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;; risk losing any text-properties in the buffer).
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;;
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;; You can manually translate a buffer into or out of a particular format
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;; with the functions `format-encode-buffer' and `format-decode-buffer'.
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;; To translate just the region use the functions `format-encode-region'
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;; and `format-decode-region'.
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;;
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;; You can define a new format by writing the encoding and decoding
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;; functions, and adding an entry to `format-alist'. See enriched.el for
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;; an example of how to implement a file format. There are various
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;; functions defined in this file that may be useful for writing the
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;; encoding and decoding functions:
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;; * `format-annotate-region' and `format-deannotate-region' allow a
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;; single alist of information to be used for encoding and decoding.
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;; The alist defines a correspondence between strings in the file
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;; ("annotations") and text-properties in the buffer.
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;; * `format-replace-strings' is similarly useful for doing simple
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;; string->string translations in a reversible manner.
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;;; Code:
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(put 'buffer-file-format 'permanent-local t)
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(defvar format-alist
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'((compressed "compressed"
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"^\037\213" ; magic number for gzip
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"gunzip -f" "gzip -f" t nil)
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(text/enriched "Extended MIME text/enriched format."
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"Content-[Tt]ype:[ \t]*text/enriched"
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enriched-decode enriched-encode t enriched-mode)
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(plain "ISO 8859-1 standard format, no text properties."
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;; Plain only exists so that there is an obvious neutral choice in
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;; the completion list.
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nil nil nil nil nil)
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(ibm "IBM Code Page 850 (DOS)"
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"1\\(^\\)"
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"recode ibm-ps:latin1" "recode latin1:ibm-pc" t nil)
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(mac "Apple Macintosh"
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"1\\(^\\)"
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"recode mac:latin1" "recode latin1:mac" t nil)
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(hp "HP Roman8"
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"1\\(^\\)"
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"recode roman8:latin1" "recode latin1:roman8" t nil)
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(TeX "TeX (encoding)"
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"1\\(^\\)"
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iso-tex2iso iso-iso2tex t nil)
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(gtex "German TeX (encoding)"
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"1\\(^\\)"
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iso-gtex2iso iso-iso2gtex t nil)
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(html "HTML (encoding)"
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"1\\(^\\)"
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"recode html:latin1" "recode latin1:html" t nil)
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(rot13 "rot13"
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"1\\(^\\)"
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"tr a-mn-z n-za-m" "tr a-mn-z n-za-m" t nil)
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(duden "Duden Ersatzdarstellung"
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"1\\(^\\)"
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"diac" iso-iso2duden t nil)
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(de646 "German ASCII (ISO 646)"
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"1\\(^\\)"
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"recode iso646-ge:latin1" "recode latin1:iso646-ge" t nil)
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(denet "net German"
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"1\\(^\\)"
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iso-german iso-cvt-read-only t nil)
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(esnet "net Spanish"
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"1\\(^\\)"
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iso-spanish iso-cvt-read-onlyt nil))
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"List of information about understood file formats.
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Elements are of the form \(NAME DOC-STR REGEXP FROM-FN TO-FN MODIFY MODE-FN).
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NAME is a symbol, which is stored in `buffer-file-format'.
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DOC-STR should be a single line providing more information about the
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format. It is currently unused, but in the future will be shown to
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the user if they ask for more information.
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REGEXP is a regular expression to match against the beginning of the file;
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it should match only files in that format.
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FROM-FN is called to decode files in that format; it gets two args, BEGIN
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and END, and can make any modifications it likes, returning the new
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end. It must make sure that the beginning of the file no longer
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matches REGEXP, or else it will get called again.
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TO-FN is called to encode a region into that format; it is passed three
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arguments: BEGIN, END, and BUFFER. BUFFER is the original buffer that
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the data being written came from, which the function could use, for
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example, to find the values of local variables. TO-FN should either
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return a list of annotations like `write-region-annotate-functions',
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or modify the region and return the new end.
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MODIFY, if non-nil, means the TO-FN wants to modify the region. If nil,
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TO-FN will not make any changes but will instead return a list of
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annotations.
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MODE-FN, if specified, is called when visiting a file with that format.")
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;;; Basic Functions (called from Lisp)
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(defun format-encode-run-method (method from to &optional buffer)
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"Translate using function or shell script METHOD the text from FROM to TO.
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If METHOD is a string, it is a shell command;
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otherwise, it should be a Lisp function.
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BUFFER should be the buffer that the output originally came from."
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(if (stringp method)
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(save-current-buffer
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(set-buffer buffer)
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(shell-command-on-region from to method t)
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(point))
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(funcall method from to buffer)))
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(defun format-decode-run-method (method from to &optional buffer)
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"Decode using function or shell script METHOD the text from FROM to TO.
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If METHOD is a string, it is a shell command;
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otherwise, it should be a Lisp function."
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(if (stringp method)
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(progn
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(shell-command-on-region from to method t)
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(point))
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(funcall method from to)))
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(defun format-annotate-function (format from to orig-buf)
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"Returns annotations for writing region as FORMAT.
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FORMAT is a symbol naming one of the formats defined in `format-alist',
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it must be a single symbol, not a list like `buffer-file-format'.
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FROM and TO delimit the region to be operated on in the current buffer.
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ORIG-BUF is the original buffer that the data came from.
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This function works like a function on `write-region-annotate-functions':
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it either returns a list of annotations, or returns with a different buffer
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current, which contains the modified text to write.
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For most purposes, consider using `format-encode-region' instead."
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;; This function is called by write-region (actually build-annotations)
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;; for each element of buffer-file-format.
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(let* ((info (assq format format-alist))
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(to-fn (nth 4 info))
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(modify (nth 5 info)))
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(if to-fn
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(if modify
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;; To-function wants to modify region. Copy to safe place.
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(let ((copy-buf (get-buffer-create " *Format Temp*")))
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(copy-to-buffer copy-buf from to)
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(set-buffer copy-buf)
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(format-insert-annotations write-region-annotations-so-far from)
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(format-encode-run-method to-fn (point-min) (point-max) orig-buf)
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nil)
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;; Otherwise just call function, it will return annotations.
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(funcall to-fn from to orig-buf)))))
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(defun format-decode (format length &optional visit-flag)
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;; This function is called by insert-file-contents whenever a file is read.
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"Decode text from any known FORMAT.
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FORMAT is a symbol appearing in `format-alist' or a list of such symbols,
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or nil, in which case this function tries to guess the format of the data by
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matching against the regular expressions in `format-alist'. After a match is
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found and the region decoded, the alist is searched again from the beginning
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for another match.
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Second arg LENGTH is the number of characters following point to operate on.
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If optional third arg VISIT-FLAG is true, set `buffer-file-format'
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to the list of formats used, and call any mode functions defined for those
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formats.
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Returns the new length of the decoded region.
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For most purposes, consider using `format-decode-region' instead."
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(let ((mod (buffer-modified-p))
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(begin (point))
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(end (+ (point) length)))
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(if (null format)
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;; Figure out which format it is in, remember list in `format'.
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(let ((try format-alist))
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(while try
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(let* ((f (car try))
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(regexp (nth 2 f))
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(p (point)))
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(if (and regexp (looking-at regexp)
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(< (match-end 0) (+ begin length)))
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(progn
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(setq format (cons (car f) format))
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;; Decode it
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(if (nth 3 f)
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(setq end (format-decode-run-method (nth 3 f) begin end)))
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;; Call visit function if required
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(if (and visit-flag (nth 6 f)) (funcall (nth 6 f) 1))
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;; Safeguard against either of the functions changing pt.
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(goto-char p)
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;; Rewind list to look for another format
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(setq try format-alist))
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(setq try (cdr try))))))
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;; Deal with given format(s)
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(or (listp format) (setq format (list format)))
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(let ((do format) f)
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(while do
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(or (setq f (assq (car do) format-alist))
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(error "Unknown format" (car do)))
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;; Decode:
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(if (nth 3 f)
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(setq end (format-decode-run-method (nth 3 f) begin end)))
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;; Call visit function if required
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(if (and visit-flag (nth 6 f)) (funcall (nth 6 f) 1))
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(setq do (cdr do)))))
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(if visit-flag
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(setq buffer-file-format format))
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(set-buffer-modified-p mod)
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;; Return new length of region
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(- end begin)))
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;;;
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;;; Interactive functions & entry points
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;;;
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(defun format-decode-buffer (&optional format)
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"Translate the buffer from some FORMAT.
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If the format is not specified, this function attempts to guess.
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`buffer-file-format' is set to the format used, and any mode-functions
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for the format are called."
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(interactive
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(list (format-read "Translate buffer from format (default: guess): ")))
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(save-excursion
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(goto-char (point-min))
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(format-decode format (buffer-size) t)))
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(defun format-decode-region (from to &optional format)
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"Decode the region from some format.
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Arg FORMAT is optional; if omitted the format will be determined by looking
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for identifying regular expressions at the beginning of the region."
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(interactive
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(list (region-beginning) (region-end)
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(format-read "Translate region from format (default: guess): ")))
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(save-excursion
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(goto-char from)
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(format-decode format (- to from) nil)))
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(defun format-encode-buffer (&optional format)
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"Translate the buffer into FORMAT.
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FORMAT defaults to `buffer-file-format'. It is a symbol naming one of the
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formats defined in `format-alist', or a list of such symbols."
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(interactive
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(list (format-read (format "Translate buffer to format (default %s): "
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buffer-file-format))))
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(format-encode-region (point-min) (point-max) format))
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(defun format-encode-region (beg end &optional format)
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"Translate the region into some FORMAT.
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FORMAT defaults to `buffer-file-format', it is a symbol naming
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one of the formats defined in `format-alist', or a list of such symbols."
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(interactive
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(list (region-beginning) (region-end)
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(format-read (format "Translate region to format (default %s): "
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buffer-file-format))))
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(if (null format) (setq format buffer-file-format))
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(if (symbolp format) (setq format (list format)))
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(save-excursion
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(goto-char end)
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(let ((cur-buf (current-buffer))
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(end (point-marker)))
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(while format
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(let* ((info (assq (car format) format-alist))
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(to-fn (nth 4 info))
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(modify (nth 5 info))
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result)
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(if to-fn
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(if modify
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(setq end (format-encode-run-method to-fn beg end
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(current-buffer)))
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(format-insert-annotations
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(funcall to-fn beg end (current-buffer)))))
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(setq format (cdr format)))))))
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(defun format-write-file (filename format)
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"Write current buffer into a FILE using some FORMAT.
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Makes buffer visit that file and sets the format as the default for future
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saves. If the buffer is already visiting a file, you can specify a directory
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name as FILE, to write a file of the same old name in that directory."
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(interactive
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;; Same interactive spec as write-file, plus format question.
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(let* ((file (if buffer-file-name
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(read-file-name "Write file: "
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nil nil nil nil)
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(read-file-name "Write file: "
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(cdr (assq 'default-directory
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(buffer-local-variables)))
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nil nil (buffer-name))))
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(fmt (format-read (format "Write file `%s' in format: "
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(file-name-nondirectory file)))))
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(list file fmt)))
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(setq buffer-file-format format)
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(write-file filename))
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(defun format-find-file (filename format)
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"Find the file FILE using data format FORMAT.
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If FORMAT is nil then do not do any format conversion."
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(interactive
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;; Same interactive spec as write-file, plus format question.
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(let* ((file (read-file-name "Find file: "))
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(fmt (format-read (format "Read file `%s' in format: "
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(file-name-nondirectory file)))))
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(list file fmt)))
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(let ((format-alist nil))
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(find-file filename))
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(if format
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(format-decode-buffer format)))
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(defun format-insert-file (filename format &optional beg end)
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"Insert the contents of file FILE using data format FORMAT.
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If FORMAT is nil then do not do any format conversion.
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The optional third and fourth arguments BEG and END specify
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the part of the file to read.
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The return value is like the value of `insert-file-contents':
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a list (ABSOLUTE-FILE-NAME . SIZE)."
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(interactive
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;; Same interactive spec as write-file, plus format question.
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(let* ((file (read-file-name "Find file: "))
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(fmt (format-read (format "Read file `%s' in format: "
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(file-name-nondirectory file)))))
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(list file fmt)))
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(let (value size)
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(let ((format-alist nil))
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(setq value (insert-file-contents filename nil beg end))
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(setq size (nth 1 value)))
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(if format
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(setq size (format-decode format size)
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value (cons (car value) size)))
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value))
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(defun format-read (&optional prompt)
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"Read and return the name of a format.
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Return value is a list, like `buffer-file-format'; it may be nil.
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Formats are defined in `format-alist'. Optional arg is the PROMPT to use."
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(let* ((table (mapcar (lambda (x) (list (symbol-name (car x))))
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format-alist))
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(ans (completing-read (or prompt "Format: ") table nil t)))
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(if (not (equal "" ans)) (list (intern ans)))))
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;;;
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;;; Below are some functions that may be useful in writing encoding and
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;;; decoding functions for use in format-alist.
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;;;
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(defun format-replace-strings (alist &optional reverse beg end)
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"Do multiple replacements on the buffer.
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ALIST is a list of (from . to) pairs, which should be proper arguments to
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`search-forward' and `replace-match' respectively.
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Optional 2nd arg REVERSE, if non-nil, means the pairs are (to . from), so that
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you can use the same list in both directions if it contains only literal
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strings.
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Optional args BEGIN and END specify a region of the buffer to operate on."
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(save-excursion
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(save-restriction
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(or beg (setq beg (point-min)))
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(if end (narrow-to-region (point-min) end))
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(while alist
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(let ((from (if reverse (cdr (car alist)) (car (car alist))))
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(to (if reverse (car (cdr alist)) (cdr (car alist)))))
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(goto-char beg)
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(while (search-forward from nil t)
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(goto-char (match-beginning 0))
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(insert to)
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(set-text-properties (- (point) (length to)) (point)
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(text-properties-at (point)))
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(delete-region (point) (+ (point) (- (match-end 0)
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(match-beginning 0)))))
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(setq alist (cdr alist)))))))
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;;; Some list-manipulation functions that we need.
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(defun format-delq-cons (cons list)
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"Remove the given CONS from LIST by side effect,
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and return the new LIST. Since CONS could be the first element
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of LIST, write `\(setq foo \(format-delq-cons element foo))' to be sure of
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changing the value of `foo'."
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(if (eq cons list)
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(cdr list)
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(let ((p list))
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(while (not (eq (cdr p) cons))
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(if (null p) (error "format-delq-cons: not an element."))
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(setq p (cdr p)))
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;; Now (cdr p) is the cons to delete
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(setcdr p (cdr cons))
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list)))
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(defun format-make-relatively-unique (a b)
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"Delete common elements of lists A and B, return as pair.
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Compares using `equal'."
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(let* ((acopy (copy-sequence a))
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(bcopy (copy-sequence b))
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(tail acopy))
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(while tail
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(let ((dup (member (car tail) bcopy))
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(next (cdr tail)))
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(if dup (setq acopy (format-delq-cons tail acopy)
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bcopy (format-delq-cons dup bcopy)))
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(setq tail next)))
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(cons acopy bcopy)))
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(defun format-common-tail (a b)
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"Given two lists that have a common tail, return it.
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Compares with `equal', and returns the part of A that is equal to the
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equivalent part of B. If even the last items of the two are not equal,
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returns nil."
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(let ((la (length a))
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(lb (length b)))
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;; Make sure they are the same length
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(if (> la lb)
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(setq a (nthcdr (- la lb) a))
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(setq b (nthcdr (- lb la) b))))
|
|
(while (not (equal a b))
|
|
(setq a (cdr a)
|
|
b (cdr b)))
|
|
a)
|
|
|
|
(defun format-reorder (items order)
|
|
"Arrange ITEMS to following partial ORDER.
|
|
Elements of ITEMS equal to elements of ORDER will be rearranged to follow the
|
|
ORDER. Unmatched items will go last."
|
|
(if order
|
|
(let ((item (member (car order) items)))
|
|
(if item
|
|
(cons (car item)
|
|
(format-reorder (format-delq-cons item items)
|
|
(cdr order)))
|
|
(format-reorder items (cdr order))))
|
|
items))
|
|
|
|
(put 'face 'format-list-valued t) ; These text-properties take values
|
|
(put 'unknown 'format-list-valued t) ; that are lists, the elements of which
|
|
; should be considered separately.
|
|
; See format-deannotate-region and
|
|
; format-annotate-region.
|
|
|
|
;;;
|
|
;;; Decoding
|
|
;;;
|
|
|
|
(defun format-deannotate-region (from to translations next-fn)
|
|
"Translate annotations in the region into text properties.
|
|
This sets text properties between FROM to TO as directed by the
|
|
TRANSLATIONS and NEXT-FN arguments.
|
|
|
|
NEXT-FN is a function that searches forward from point for an annotation.
|
|
It should return a list of 4 elements: \(BEGIN END NAME POSITIVE). BEGIN and
|
|
END are buffer positions bounding the annotation, NAME is the name searched
|
|
for in TRANSLATIONS, and POSITIVE should be non-nil if this annotation marks
|
|
the beginning of a region with some property, or nil if it ends the region.
|
|
NEXT-FN should return nil if there are no annotations after point.
|
|
|
|
The basic format of the TRANSLATIONS argument is described in the
|
|
documentation for the `format-annotate-region' function. There are some
|
|
additional things to keep in mind for decoding, though:
|
|
|
|
When an annotation is found, the TRANSLATIONS list is searched for a
|
|
text-property name and value that corresponds to that annotation. If the
|
|
text-property has several annotations associated with it, it will be used only
|
|
if the other annotations are also in effect at that point. The first match
|
|
found whose annotations are all present is used.
|
|
|
|
The text property thus determined is set to the value over the region between
|
|
the opening and closing annotations. However, if the text-property name has a
|
|
non-nil `format-list-valued' property, then the value will be consed onto the
|
|
surrounding value of the property, rather than replacing that value.
|
|
|
|
There are some special symbols that can be used in the \"property\" slot of
|
|
the TRANSLATIONS list: PARAMETER and FUNCTION \(spelled in uppercase).
|
|
Annotations listed under the pseudo-property PARAMETER are considered to be
|
|
arguments of the immediately surrounding annotation; the text between the
|
|
opening and closing parameter annotations is deleted from the buffer but saved
|
|
as a string. The surrounding annotation should be listed under the
|
|
pseudo-property FUNCTION. Instead of inserting a text-property for this
|
|
annotation, the function listed in the VALUE slot is called to make whatever
|
|
changes are appropriate. The function's first two arguments are the START and
|
|
END locations, and the rest of the arguments are any PARAMETERs found in that
|
|
region.
|
|
|
|
Any annotations that are found by NEXT-FN but not defined by TRANSLATIONS
|
|
are saved as values of the `unknown' text-property \(which is list-valued).
|
|
The TRANSLATIONS list should usually contain an entry of the form
|
|
\(unknown \(nil format-annotate-value))
|
|
to write these unknown annotations back into the file."
|
|
(save-excursion
|
|
(save-restriction
|
|
(narrow-to-region (point-min) to)
|
|
(goto-char from)
|
|
(let (next open-ans todo loc unknown-ans)
|
|
(while (setq next (funcall next-fn))
|
|
(let* ((loc (nth 0 next))
|
|
(end (nth 1 next))
|
|
(name (nth 2 next))
|
|
(positive (nth 3 next))
|
|
(found nil))
|
|
|
|
;; Delete the annotation
|
|
(delete-region loc end)
|
|
(if positive
|
|
;; Positive annotations are stacked, remembering location
|
|
(setq open-ans (cons (list name loc) open-ans))
|
|
;; It is a negative annotation:
|
|
;; Close the top annotation & add its text property.
|
|
;; If the file's nesting is messed up, the close might not match
|
|
;; the top thing on the open-annotations stack.
|
|
;; If no matching annotation is open, just ignore the close.
|
|
(if (not (assoc name open-ans))
|
|
(message "Extra closing annotation (%s) in file" name)
|
|
;; If one is open, but not on the top of the stack, close
|
|
;; the things in between as well. Set `found' when the real
|
|
;; one is closed.
|
|
(while (not found)
|
|
(let* ((top (car open-ans)) ; first on stack: should match.
|
|
(top-name (car top))
|
|
(start (car (cdr top))) ; location of start
|
|
(params (cdr (cdr top))) ; parameters
|
|
(aalist translations)
|
|
(matched nil))
|
|
(if (equal name top-name)
|
|
(setq found t)
|
|
(message "Improper nesting in file."))
|
|
;; Look through property names in TRANSLATIONS
|
|
(while aalist
|
|
(let ((prop (car (car aalist)))
|
|
(alist (cdr (car aalist))))
|
|
;; And look through values for each property
|
|
(while alist
|
|
(let ((value (car (car alist)))
|
|
(ans (cdr (car alist))))
|
|
(if (member top-name ans)
|
|
;; This annotation is listed, but still have to
|
|
;; check if multiple annotations are satisfied
|
|
(if (member 'nil (mapcar
|
|
(lambda (r)
|
|
(assoc r open-ans))
|
|
ans))
|
|
nil ; multiple ans not satisfied
|
|
;; Yes, all set.
|
|
;; If there are multiple annotations going
|
|
;; into one text property, adjust the
|
|
;; begin points of the other annotations
|
|
;; so that we don't get double marking.
|
|
(let ((to-reset ans)
|
|
this-one)
|
|
(while to-reset
|
|
(setq this-one
|
|
(assoc (car to-reset)
|
|
(cdr open-ans)))
|
|
(if this-one
|
|
(setcar (cdr this-one) loc))
|
|
(setq to-reset (cdr to-reset))))
|
|
;; Set loop variables to nil so loop
|
|
;; will exit.
|
|
(setq alist nil aalist nil matched t
|
|
;; pop annotation off stack.
|
|
open-ans (cdr open-ans))
|
|
(cond
|
|
;; Check for pseudo-properties
|
|
((eq prop 'PARAMETER)
|
|
;; This is a parameter of the top open ann:
|
|
;; delete text and use as arg.
|
|
(if open-ans
|
|
;; (If nothing open, discard).
|
|
(setq open-ans
|
|
(cons (append (car open-ans)
|
|
(list
|
|
(buffer-substring
|
|
start loc)))
|
|
(cdr open-ans))))
|
|
(delete-region start loc))
|
|
((eq prop 'FUNCTION)
|
|
;; Not a property, but a function to call.
|
|
(let ((rtn (apply value start loc params)))
|
|
(if rtn (setq todo (cons rtn todo)))))
|
|
(t
|
|
;; Normal property/value pair
|
|
(setq todo
|
|
(cons (list start loc prop value)
|
|
todo)))))))
|
|
(setq alist (cdr alist))))
|
|
(setq aalist (cdr aalist)))
|
|
(if matched
|
|
nil
|
|
;; Didn't find any match for the annotation:
|
|
;; Store as value of text-property `unknown'.
|
|
(setq open-ans (cdr open-ans))
|
|
(setq todo (cons (list start loc 'unknown top-name)
|
|
todo))
|
|
(setq unknown-ans (cons name unknown-ans)))))))))
|
|
|
|
;; Once entire file has been scanned, add the properties.
|
|
(while todo
|
|
(let* ((item (car todo))
|
|
(from (nth 0 item))
|
|
(to (nth 1 item))
|
|
(prop (nth 2 item))
|
|
(val (nth 3 item)))
|
|
|
|
(put-text-property
|
|
from to prop
|
|
(cond ((numberp val) ; add to ambient value if numeric
|
|
(+ val (or (get-text-property from prop) 0)))
|
|
((get prop 'format-list-valued) ; value gets consed onto
|
|
; list-valued properties
|
|
(let ((prev (get-text-property from prop)))
|
|
(cons val (if (listp prev) prev (list prev)))))
|
|
(t val)))) ; normally, just set to val.
|
|
(setq todo (cdr todo)))
|
|
|
|
(if unknown-ans
|
|
(message "Unknown annotations: %s" unknown-ans))))))
|
|
|
|
;;;
|
|
;;; Encoding
|
|
;;;
|
|
|
|
(defun format-insert-annotations (list &optional offset)
|
|
"Apply list of annotations to buffer as `write-region' would.
|
|
Inserts each element of the given LIST of buffer annotations at its
|
|
appropriate place. Use second arg OFFSET if the annotations' locations are
|
|
not relative to the beginning of the buffer: annotations will be inserted
|
|
at their location-OFFSET+1 \(ie, the offset is treated as the character number
|
|
of the first character in the buffer)."
|
|
(if (not offset)
|
|
(setq offset 0)
|
|
(setq offset (1- offset)))
|
|
(let ((l (reverse list)))
|
|
(while l
|
|
(goto-char (- (car (car l)) offset))
|
|
(insert (cdr (car l)))
|
|
(setq l (cdr l)))))
|
|
|
|
(defun format-annotate-value (old new)
|
|
"Return OLD and NEW as a \(close . open) annotation pair.
|
|
Useful as a default function for TRANSLATIONS alist when the value of the text
|
|
property is the name of the annotation that you want to use, as it is for the
|
|
`unknown' text property."
|
|
(cons (if old (list old))
|
|
(if new (list new))))
|
|
|
|
(defun format-annotate-region (from to trans format-fn ignore)
|
|
"Generate annotations for text properties in the region.
|
|
Searches for changes between FROM and TO, and describes them with a list of
|
|
annotations as defined by alist TRANSLATIONS and FORMAT-FN. IGNORE lists text
|
|
properties not to consider; any text properties that are neither ignored nor
|
|
listed in TRANSLATIONS are warned about.
|
|
If you actually want to modify the region, give the return value of this
|
|
function to `format-insert-annotations'.
|
|
|
|
Format of the TRANSLATIONS argument:
|
|
|
|
Each element is a list whose car is a PROPERTY, and the following
|
|
elements are VALUES of that property followed by the names of zero or more
|
|
ANNOTATIONS. Whenever the property takes on that value, the annotations
|
|
\(as formatted by FORMAT-FN) are inserted into the file.
|
|
When the property stops having that value, the matching negated annotation
|
|
will be inserted \(it may actually be closed earlier and reopened, if
|
|
necessary, to keep proper nesting).
|
|
|
|
If the property's value is a list, then each element of the list is dealt with
|
|
separately.
|
|
|
|
If a VALUE is numeric, then it is assumed that there is a single annotation
|
|
and each occurrence of it increments the value of the property by that number.
|
|
Thus, given the entry \(left-margin \(4 \"indent\")), if the left margin
|
|
changes from 4 to 12, two <indent> annotations will be generated.
|
|
|
|
If the VALUE is nil, then instead of annotations, a function should be
|
|
specified. This function is used as a default: it is called for all
|
|
transitions not explicitly listed in the table. The function is called with
|
|
two arguments, the OLD and NEW values of the property. It should return
|
|
lists of annotations like `format-annotate-location' does.
|
|
|
|
The same structure can be used in reverse for reading files."
|
|
(let ((all-ans nil) ; All annotations - becomes return value
|
|
(open-ans nil) ; Annotations not yet closed
|
|
(loc nil) ; Current location
|
|
(not-found nil)) ; Properties that couldn't be saved
|
|
(while (or (null loc)
|
|
(and (setq loc (next-property-change loc nil to))
|
|
(< loc to)))
|
|
(or loc (setq loc from))
|
|
(let* ((ans (format-annotate-location loc (= loc from) ignore trans))
|
|
(neg-ans (format-reorder (aref ans 0) open-ans))
|
|
(pos-ans (aref ans 1))
|
|
(ignored (aref ans 2)))
|
|
(setq not-found (append ignored not-found)
|
|
ignore (append ignored ignore))
|
|
;; First do the negative (closing) annotations
|
|
(while neg-ans
|
|
;; Check if it's missing. This can happen (eg, a numeric property
|
|
;; going negative can generate closing annotations before there are
|
|
;; any open). Warn user & ignore.
|
|
(if (not (member (car neg-ans) open-ans))
|
|
(message "Can't close %s: not open." (car neg-ans))
|
|
(while (not (equal (car neg-ans) (car open-ans)))
|
|
;; To close anno. N, need to first close ans 1 to N-1,
|
|
;; remembering to re-open them later.
|
|
(setq pos-ans (cons (car open-ans) pos-ans))
|
|
(setq all-ans
|
|
(cons (cons loc (funcall format-fn (car open-ans) nil))
|
|
all-ans))
|
|
(setq open-ans (cdr open-ans)))
|
|
;; Now remove the one we're really interested in from open list.
|
|
(setq open-ans (cdr open-ans))
|
|
;; And put the closing annotation here.
|
|
(setq all-ans
|
|
(cons (cons loc (funcall format-fn (car neg-ans) nil))
|
|
all-ans)))
|
|
(setq neg-ans (cdr neg-ans)))
|
|
;; Now deal with positive (opening) annotations
|
|
(let ((p pos-ans))
|
|
(while pos-ans
|
|
(setq open-ans (cons (car pos-ans) open-ans))
|
|
(setq all-ans
|
|
(cons (cons loc (funcall format-fn (car pos-ans) t))
|
|
all-ans))
|
|
(setq pos-ans (cdr pos-ans))))))
|
|
|
|
;; Close any annotations still open
|
|
(while open-ans
|
|
(setq all-ans
|
|
(cons (cons to (funcall format-fn (car open-ans) nil))
|
|
all-ans))
|
|
(setq open-ans (cdr open-ans)))
|
|
(if not-found
|
|
(message "These text properties could not be saved:\n %s"
|
|
not-found))
|
|
(nreverse all-ans)))
|
|
|
|
;;; Internal functions for format-annotate-region.
|
|
|
|
(defun format-annotate-location (loc all ignore trans)
|
|
"Return annotation(s) needed at LOCATION.
|
|
This includes any properties that change between LOC-1 and LOC.
|
|
If ALL is true, don't look at previous location, but generate annotations for
|
|
all non-nil properties.
|
|
Third argument IGNORE is a list of text-properties not to consider.
|
|
|
|
Return value is a vector of 3 elements:
|
|
1. List of names of the annotations to close
|
|
2. List of the names of annotations to open.
|
|
3. List of properties that were ignored or couldn't be annotated."
|
|
(let* ((prev-loc (1- loc))
|
|
(before-plist (if all nil (text-properties-at prev-loc)))
|
|
(after-plist (text-properties-at loc))
|
|
p negatives positives prop props not-found)
|
|
;; make list of all property names involved
|
|
(setq p before-plist)
|
|
(while p
|
|
(if (not (memq (car p) props))
|
|
(setq props (cons (car p) props)))
|
|
(setq p (cdr (cdr p))))
|
|
(setq p after-plist)
|
|
(while p
|
|
(if (not (memq (car p) props))
|
|
(setq props (cons (car p) props)))
|
|
(setq p (cdr (cdr p))))
|
|
|
|
(while props
|
|
(setq prop (car props)
|
|
props (cdr props))
|
|
(if (memq prop ignore)
|
|
nil ; If it's been ignored before, ignore it now.
|
|
(let ((before (if all nil (car (cdr (memq prop before-plist)))))
|
|
(after (car (cdr (memq prop after-plist)))))
|
|
(if (equal before after)
|
|
nil ; no change; ignore
|
|
(let ((result (format-annotate-single-property-change
|
|
prop before after trans)))
|
|
(if (not result)
|
|
(setq not-found (cons prop not-found))
|
|
(setq negatives (nconc negatives (car result))
|
|
positives (nconc positives (cdr result)))))))))
|
|
(vector negatives positives not-found)))
|
|
|
|
(defun format-annotate-single-property-change (prop old new trans)
|
|
"Return annotations for PROPERTY changing from OLD to NEW.
|
|
These are searched for in the TRANSLATIONS alist.
|
|
If NEW does not appear in the list, but there is a default function, then that
|
|
function is called.
|
|
Annotations to open and to close are returned as a dotted pair."
|
|
(let ((prop-alist (cdr (assoc prop trans)))
|
|
default)
|
|
(if (not prop-alist)
|
|
nil
|
|
;; If property is numeric, nil means 0
|
|
(cond ((and (numberp old) (null new))
|
|
(setq new 0))
|
|
((and (numberp new) (null old))
|
|
(setq old 0)))
|
|
;; If either old or new is a list, have to treat both that way.
|
|
(if (or (consp old) (consp new))
|
|
(let* ((old (if (listp old) old (list old)))
|
|
(new (if (listp new) new (list new)))
|
|
(tail (format-common-tail old new))
|
|
close open)
|
|
(while old
|
|
(setq close
|
|
(append (car (format-annotate-atomic-property-change
|
|
prop-alist (car old) nil))
|
|
close)
|
|
old (cdr old)))
|
|
(while new
|
|
(setq open
|
|
(append (cdr (format-annotate-atomic-property-change
|
|
prop-alist nil (car new)))
|
|
open)
|
|
new (cdr new)))
|
|
(format-make-relatively-unique close open))
|
|
(format-annotate-atomic-property-change prop-alist old new)))))
|
|
|
|
(defun format-annotate-atomic-property-change (prop-alist old new)
|
|
"Internal function annotate a single property change.
|
|
PROP-ALIST is the relevant segment of a TRANSLATIONS list.
|
|
OLD and NEW are the values."
|
|
(cond
|
|
;; Numerical annotation - use difference
|
|
((and (numberp old) (numberp new))
|
|
(let* ((entry (progn
|
|
(while (and (car (car prop-alist))
|
|
(not (numberp (car (car prop-alist)))))
|
|
(setq prop-alist (cdr prop-alist)))
|
|
(car prop-alist)))
|
|
(increment (car (car prop-alist)))
|
|
(n (ceiling (/ (float (- new old)) (float increment))))
|
|
(anno (car (cdr (car prop-alist)))))
|
|
(if (> n 0)
|
|
(cons nil (make-list n anno))
|
|
(cons (make-list (- n) anno) nil))))
|
|
|
|
;; Standard annotation
|
|
(t (let ((close (and old (cdr (assoc old prop-alist))))
|
|
(open (and new (cdr (assoc new prop-alist)))))
|
|
(if (or close open)
|
|
(format-make-relatively-unique close open)
|
|
;; Call "Default" function, if any
|
|
(let ((default (assq nil prop-alist)))
|
|
(if default
|
|
(funcall (car (cdr default)) old new))))))))
|
|
|
|
(provide 'format)
|
|
;; format.el ends here
|