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; Copyright (C) 2024, ForrestHunt, Inc.
; Written by Matt Kaufmann
; License: A 3-clause BSD license. See the LICENSE file distributed with ACL2.
; Release approved by DARPA with "DISTRIBUTION STATEMENT A. Approved
; for public release. Distribution is unlimited."
; These utilities have been used as part of a process of converting to
; XDOC an HTML file that was already created using latex2html. There
; is little documentation, but it may be helpful in future projects,
; in which case it may be straightforward to add documentation at that
; time.
; This file assumes that ctl-t-keymap has been defined, and might more
; generally assume that emacs-acl2.el has been loaded.
(defun within-tag (start-tag end-tag)
(let ((saved-point (point)))
(cond ((search-backward start-tag nil t)
(let ((p (match-beginning 0)))
(goto-char saved-point)
(cond ((search-backward end-tag nil t)
(goto-char saved-point)
(< (match-end 0) p))
(t t))))
(t nil))))
(defun html-end-paragraphs ()
(interactive)
(save-excursion
(goto-char (point-min))
(while (search-forward "\n\n" nil t)
(let ((p0 (match-beginning 0)))
(when (not (or (within-tag "<ul>" "</ul>")
(within-tag "<ol>" "</ol>")
(within-tag "<dl>" "</dl>")
(within-tag "<pre>" "</pre>")))
(goto-char p0)
(insert "\n</p>")
;;; Move past newlines.
(while (looking-at "\n")
(forward-char 1)))))))
(defun html-fix-p-tag-within-lists ()
(interactive)
(save-excursion
(goto-char (point-min))
(while (search-forward "<p>" nil t)
(let ((p0 (match-end 0)))
(when (or (within-tag "<ul>" "</ul>")
(within-tag "<ol>" "</ol>")
(within-tag "<dl>" "</dl>"))
; Deliberately omitted <pre> above.
(goto-char (- p0 1))
(insert "/"))))))
(defun html-fix-string (old new)
(interactive)
(save-excursion
(goto-char (point-min))
(while (search-forward old nil t)
(replace-match new nil t))))
(defun html-fix-strings ()
(interactive)
(html-fix-string "\\" "\\\\")
(html-fix-string "\"" "\\\"")
(html-fix-string "&ldots;" "…")
; Latex2html has translated \ptt{<<=} to <tt>«=</tt>.
(html-fix-string "«=" "<<="))
(defun html-remove-comments ()
(interactive)
(save-excursion
(goto-char (point-min))
(while (search-forward "<!--" nil t)
(let ((beg (match-beginning 0)))
(search-forward "-->")
; Avoid blank lines that could cause paragraph markers to be added.
(while (looking-at "\n") (forward-char 1))
(delete-region beg (point))))))
(defun html-balance-br ()
(interactive)
(html-fix-string "<br>" "<br/>"))
(defun html-error-on-bad-stuff ()
(interactive)
(let ((saved-point (point)))
(goto-char (point-min))
(cond
((search-forward "<sup>" nil t)
(goto-char (match-beginning 0))
(error "Need to deal with <sup> here."))
((search-forward "<!-- MATH" nil t)
(goto-char (match-beginning 0))
(error "Need to deal with MATH comment here."))
((search-forward ".svg" nil t)
(goto-char (match-beginning 0))
(error "Need to deal with image here."))
((search-forward "<br/>" nil t)
(goto-char (match-beginning 0))
(error "Found <br/>; need to deal with <br> tags manually."))
(t (goto-char saved-point)))))
(defun html-convert-tt ()
(interactive)
(goto-char (point-min))
(while (search-forward "<span class=\"texttt\">" nil t)
(let ((p1 (match-beginning 0))
(p2 (match-end 0)))
(search-forward "</span>")
(let ((p3 (match-beginning 0))
(p4 (match-end 0)))
(goto-char p2)
(cond
((search-forward "<span" p3 t)
(goto-char (match-beginning 0))
(error "Unable to handle nested span tags within texttt"))
(t
(delete-region p3 p4)
(goto-char p3)
(insert "</tt>")
(delete-region p1 p2)
(goto-char p1)
(insert "<tt>")))))))
(defun html-remove-span-1 (point1 point2)
; Here point1 and point2 are start and end positions of "<span".
(search-forward "</span>")
(let ((point3 (match-beginning 0))
(point4 (match-end 0)))
(goto-char point2)
(cond ((search-forward "class=\"texttt\"" point3 t)) ; just continue
((search-forward "<span" point3 t)
(goto-char point1)
(error "Unable to handle nested span tags here"))
((not (or (search-forward "class=\"MATH\"" point3 t)
(search-forward "class=\"arabic\"" point3 t)))
(goto-char point1)
(error "Unknown class here!"))
(t
(goto-char point3)
(kill-sexp)
(goto-char point1)
(kill-sexp)))))
(defun html-remove-span ()
(interactive)
(goto-char (point-min))
(while (search-forward "<span" nil t)
(html-remove-span-1 (match-beginning 0) (match-end 0))))
(defun html-fix-sub ()
(interactive)
(goto-char (point-min))
(let ((saved-point (point)))
(while (re-search-forward "</i><sub>\\(.*\\)</sub>" nil t)
;;; 0 1 2 3
(let* ((p0 (match-beginning 0))
(p1 (match-beginning 1)))
(goto-char p1)
(search-forward "</sub>")
(let* ((p2 (match-beginning 0))
(p3 (match-end 0))
(subscript (buffer-substring p1 p2)))
(goto-char p1)
(when (search-forward "sub>" p2 t)
(error "Nested subscripts found here; must fix manually"))
(delete-region (+ p0 4) p3)
(goto-char p0)
(insert "_")
(insert subscript))))))
(defun html-replace-string (from-string to-string start end)
; This is just a version of replace-string to use in a program, to
; avoid byte compiler warnings in some versions of Emacs.
(save-excursion
(goto-char start)
(while (search-forward from-string end t)
(replace-match to-string end t))))
(defun html-convert-code-to-tt-and-pre-to-code ()
(interactive)
(html-replace-string "<code>" "<tt>" (point-min) (point-max))
(html-replace-string "</code>" "</tt>" (point-min) (point-max))
(html-replace-string "<pre>" "<code>" (point-min) (point-max))
(html-replace-string "</pre>" "</code>" (point-min) (point-max)))
(defun html-remove-monospace-for-tt ()
(interactive)
(save-excursion
(goto-char (point-min))
(while (search-forward "<span style=\"font-family:monospace\">" nil t)
(replace-match "<span class=\"texttt\">"))))
(defun html-convert-tt-atsigns-to-code ()
;;; E.g., convert
;; <span class="texttt">@@@
;; <em>Base Case:</em>
;; <br>(implies (not (consp x))
;; <br> <span class="MATH"><i>ψ</i></span>)
;; <br>@@@
;; </span>
;;; to:
;; <code>
;; <em>Base Case:</em>
;; (implies (not (consp x))
;; <span class="MATH"><i>ψ</i></span>)
;; </code>
(interactive)
(goto-char (point-min))
(while (search-forward "<span class=\"texttt\">@@@" nil t)
(let ((p0 (match-beginning 0))
(p1 (match-end 0))
(newline-br-atsigns-string "\n<br>@@@"))
(search-forward newline-br-atsigns-string)
(let ((p2 (+ 1 (match-beginning 0))))
(html-replace-string " " " " p1 p2)
;;; Now recalculate end points.
(goto-char p1)
(search-forward newline-br-atsigns-string)
(let ((p2 (+ 1 (match-beginning 0))))
(html-replace-string "<br>" "" p1 p2)
;;; Now recalculate end points.
(search-forward (concat newline-br-atsigns-string "\n</span>"))
(replace-match "</code>")
(goto-char p0)
(delete-region p0 p1)
(insert "<code>"))))))
(defun html-convert ()
(interactive)
(html-mode)
(untabify (point-min) (point-max))
(html-remove-comments)
(html-error-on-bad-stuff)
(html-convert-code-to-tt-and-pre-to-code)
(html-convert-tt-atsigns-to-code)
(html-balance-br)
(html-remove-monospace-for-tt)
; It's probably much more common to have $..$ within a texttt
; environment than vice versa. So we remove the "MATH" (and "arabic")
; stuff first, skipping over texttt.
(html-remove-span)
(html-end-paragraphs)
(html-convert-tt)
(html-fix-sub)
(html-fix-p-tag-within-lists)
(html-fix-strings)
(indent-rigidly (point-min) (point-max) 1)
(untabify (point-min) (point-max)))
(define-key ctl-t-keymap "h" 'html-convert)
(define-key ctl-t-keymap "m" 'html-remove-span)
; The following keyboard macro expects one to be on a line of the form
; nodexx.html
; for some "xx". It switches to a (hopefully new) buffer, "nodexx",
; and inserts the contents of notes-version-6/nodexx.html.
; This probably isn't of general use but I found it useful and it
; might inspire development of a more general utility.
(fset 'node
[?\C-a ?\C-f ?\C-f ?\C- ?\C-e ?\M-w ?\C-x ?b ?\C-y backspace backspace backspace backspace backspace return ?\C-x ?i ?n ?o ?t ?e ?s ?- ?v ?e ?r ?s ?i ?o ?n ?- ?6 ?/ ?\C-y return ?\C-s ?< ?a ? ?i ?d ?= ?\C-n ?\C-n ?\C-n ?\C-n ?\C-a ?\M-< ?\C-w ?\M-> ?\C- ?\C-p ?\C-p ?\C-p ?\C-p ?\C-p ?\C-w])
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