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commit 34f15b65699ed3bb7b5cf6f9f1c12fd99a937c8f
Author: Thien-Thi Nguyen <t...@gnu.org>
Date: Tue Jan 14 21:54:33 2014 +0100
New package: ascii-art-to-unicode
* packages/ascii-art-to-unicode/: New dir.
* packages/ascii-art-to-unicode/ascii-art-to-unicode.el: New file.
---
.../ascii-art-to-unicode/ascii-art-to-unicode.el | 277 ++++++++++++++++++++
1 files changed, 277 insertions(+), 0 deletions(-)
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b/packages/ascii-art-to-unicode/ascii-art-to-unicode.el
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+;;; ascii-art-to-unicode.el --- a small artist adjunct -*- lexical-binding: t
-*-
+
+;; Copyright (C) 2014 Free Software Foundation, Inc.
+
+;; Author: Thien-Thi Nguyen <t...@gnu.org>
+;; Version: 1.4
+
+;; This program is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+;; This program is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; The command `aa2u' converts simple ASCII art line drawings in
+;; the {active,accessible} region of the current buffer to Unicode.
+;;
+;; Example use case:
+;; - M-x artist-mode RET
+;; - C-c C-a r ; artist-select-op-rectangle
+;; - (draw two rectangles)
+;;
+;; +---------------+
+;; | |
+;; | +-------+--+
+;; | | | |
+;; | | | |
+;; | | | |
+;; +-------+-------+ |
+;; | |
+;; | |
+;; | |
+;; +----------+
+;;
+;; - C-c C-c ; artist-mode-off (optional)
+;; - C-x n n ; narrow-to-region
+;; - M-x aa2u RET
+;;
+;; ┌───────────────┐
+;; │ │
+;; │ ┌───────┼──┐
+;; │ │ │ │
+;; │ │ │ │
+;; │ │ │ │
+;; └───────┼───────┘ │
+;; │ │
+;; │ │
+;; │ │
+;; └──────────┘
+;;
+;; TODO:
+;; - Add phase 0, to grok and lock label (as opposed to line) text.
+;; - Add interactive mode, to choose per-line light vs heavy.
+;; - Improve neighbor-determining heuristic.
+;; - Choose plus-replacement by composing "VERTICAL", "LEFT", etc.
+
+;;; News:
+
+;; - 1.4 | 2014-01-14
+;; - move to ELPA (from <http://www.gnuvola.org/software/j/aa2u/>)
+;; - change copyright to FSF
+;; - require 'cl-lib instead of 'cl
+;; - use ‘cl-flet’ and ‘cl-labels’
+;; - comment munging
+;; - add ‘lexical-binding: t’
+;; - remove huge list at EOF
+;; - add Author and News headers
+;;
+;; - 1.3 | 2013-09-21
+;; - bug fixed: ‘?+’ neighbor valuation polarity flipped
+;; - new support for BOX DRAWINGS LIGHT {UP,DOWN,LEFT,RIGHT} (singleton)
+;;
+;; - 1.2 | 2012-11-05
+;; - refer to Unicode characters by name, not number
+;;
+;; - 1.1 | 2012-04-17
+;; - TAB agnostic
+;; - ‘aa2u’ operates on active region if ‘use-region-p’
+;; - example use case also demonstrates transformation
+;;
+;; - 1.0 | 2012-04-07
+;; - initial release
+
+;;; Code:
+
+(require 'cl-lib)
+(require 'pcase)
+
+;;;---------------------------------------------------------------------------
+;;; support
+
+(defun aa2u-ucs-bd-uniform-name (weight &rest components)
+ "Return a string naming UCS char w/ WEIGHT and COMPONENTS.
+The string begins with \"BOX DRAWINGS\"; followed by WEIGHT,
+a symbol from the set:
+
+ HEAVY
+ LIGHT
+
+followed by COMPONENTS, a list of one or two symbols from the set:
+
+ VERTICAL
+ HORIZONTAL
+ DOWN
+ UP
+ RIGHT
+ LEFT
+
+If of length two, the first element in COMPONENTS should be
+the \"Y-axis\" (VERTICAL, DOWN, UP). In that case, the returned
+string includes \"AND\" between the elements of COMPONENTS.
+
+Lastly, all words are separated by space (U+20)."
+ (format "BOX DRAWINGS %s %s"
+ weight
+ (mapconcat 'symbol-name components
+ " AND ")))
+
+(defun aa2u-1c (stringifier &rest components)
+ "Apply STRINGIFIER to COMPONENTS; return the UCS char w/ this name.
+The char is a string (of length one), with two properties:
+
+ aa2u-stringifier
+ aa2u-components
+
+Their values are STRINGIFIER and COMPONENTS, respectively."
+ (let ((s (string (cdr (assoc-string (apply stringifier components)
+ (ucs-names))))))
+ (propertize s
+ 'aa2u-stringifier stringifier
+ 'aa2u-components components)))
+
+(defun aa2u-phase-1 ()
+ (goto-char (point-min))
+ (let ((vert (aa2u-1c 'aa2u-ucs-bd-uniform-name 'LIGHT 'VERTICAL)))
+ (while (search-forward "|" nil t)
+ (replace-match vert t t)))
+ (goto-char (point-min))
+ (let ((horz (aa2u-1c 'aa2u-ucs-bd-uniform-name 'LIGHT 'HORIZONTAL)))
+ (while (search-forward "-" nil t)
+ (replace-match horz t t))))
+
+(defun aa2u-replacement (pos)
+ (let ((cc (- pos (line-beginning-position))))
+ (cl-labels
+ ((ok (name pos)
+ (when (or
+ ;; Infer LIGHTness between "snug" ‘?+’es.
+ ;; |
+ ;; +-----------++--+ +
+ ;; | somewhere ++--+---+-+----+
+ ;; +-+---------+ nowhere |+--+
+ ;; + +---------++
+ ;; | +---|
+ (eq ?+ (char-after pos))
+ ;; Require properly directional neighborliness.
+ (memq (case name
+ ((n s) 'VERTICAL)
+ ((w e) 'HORIZONTAL))
+ (get-text-property pos 'aa2u-components)))
+ name))
+ (v (name dir) (let ((bol (line-beginning-position dir))
+ (eol (line-end-position dir)))
+ (when (< cc (- eol bol))
+ (ok name (+ bol cc)))))
+ (h (name dir) (let ((bol (line-beginning-position))
+ (eol (line-end-position))
+ (pos (+ pos dir)))
+ (unless (or (> bol pos)
+ (<= eol pos))
+ (ok name pos))))
+ (light (&rest components) (apply 'aa2u-1c
+ 'aa2u-ucs-bd-uniform-name
+ 'LIGHT components)))
+ (let* ((n (v 'n 0))
+ (s (v 's 2))
+ (w (h 'w -1))
+ (e (h 'e 1)))
+ (pcase (delq nil (list n s w e))
+ (`(n s w e) (light 'VERTICAL 'HORIZONTAL))
+ (`(s e) (light 'DOWN 'RIGHT))
+ (`(s w) (light 'DOWN 'LEFT))
+ (`(n e) (light 'UP 'RIGHT))
+ (`(n w) (light 'UP 'LEFT))
+ (`(n s e) (light 'VERTICAL 'RIGHT))
+ (`(n s w) (light 'VERTICAL 'LEFT))
+ (`(n w e) (light 'UP 'HORIZONTAL))
+ (`(s w e) (light 'DOWN 'HORIZONTAL))
+ (`(n) (light 'UP))
+ (`(s) (light 'DOWN))
+ (`(w) (light 'LEFT))
+ (`(e) (light 'RIGHT))
+ (_ nil))))))
+
+(defun aa2u-phase-2 ()
+ (goto-char (point-min))
+ (let (changes)
+ ;; (phase 2.1 -- what WOULD change)
+ ;; This is for the benefit of ‘aa2u-replacement ok’, which
+ ;; otherwise (monolithic phase 2) would need to convert the
+ ;; "properly directional neighborliness" impl from a simple
+ ;; ‘memq’ to an ‘intersction’.
+ (while (search-forward "+" nil t)
+ (let ((p (point)))
+ (push (cons p (or (aa2u-replacement (1- p))
+ "?"))
+ changes)))
+ ;; (phase 2.2 -- apply changes)
+ (dolist (ch changes)
+ (goto-char (car ch))
+ (delete-char -1)
+ (insert (cdr ch)))))
+
+(defun aa2u-phase-3 ()
+ (remove-text-properties (point-min) (point-max)
+ (list 'aa2u-stringifier nil
+ 'aa2u-components nil)))
+
+;;;---------------------------------------------------------------------------
+;;; command
+
+;;;###autoload
+(defun aa2u ()
+ "Convert simple ASCII art line drawings to Unicode.
+Specifically, perform the following replacements:
+
+ - (hyphen) BOX DRAWINGS LIGHT HORIZONTAL
+ | (vertical bar) BOX DRAWINGS LIGHT VERTICAL
+ + (plus) (one of)
+ BOX DRAWINGS LIGHT VERTICAL AND HORIZONTAL
+ BOX DRAWINGS LIGHT DOWN AND RIGHT
+ BOX DRAWINGS LIGHT DOWN AND LEFT
+ BOX DRAWINGS LIGHT UP AND RIGHT
+ BOX DRAWINGS LIGHT UP AND LEFT
+ BOX DRAWINGS LIGHT VERTICAL AND RIGHT
+ BOX DRAWINGS LIGHT VERTICAL AND LEFT
+ BOX DRAWINGS LIGHT UP AND HORIZONTAL
+ BOX DRAWINGS LIGHT DOWN AND HORIZONTAL
+ BOX DRAWINGS LIGHT UP
+ BOX DRAWINGS LIGHT DOWN
+ BOX DRAWINGS LIGHT LEFT
+ BOX DRAWINGS LIGHT RIGHT
+ QUESTION MARK
+
+More precisely, hyphen and vertical bar are substituted unconditionally,
+first, and plus is substituted with a character depending on its north,
+south, east and west neighbors.
+
+This command operates on either the active region, as per
+`use-region-p', or the accessible portion otherwise."
+ (interactive)
+ (save-excursion
+ (cl-flet
+ ((do-it! () (aa2u-phase-1) (aa2u-phase-2) (aa2u-phase-3)))
+ (if (use-region-p)
+ (let ((beg (region-beginning))
+ (end (region-end)))
+ (save-restriction
+ (widen)
+ (narrow-to-region beg end)
+ (do-it!)))
+ (do-it!)))))
+
+;;;---------------------------------------------------------------------------
+;;; that's it
+
+(provide 'ascii-art-to-unicode)
+
+;;; ascii-art-to-unicode.el ends here
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