236 lines
8.6 KiB
EmacsLisp
236 lines
8.6 KiB
EmacsLisp
;;; md4tj_parse --- Summary
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;;; Commentary:
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;;; Code:
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(require 'cl-lib)
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(defun getline ()
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"Get current line from loaded buffer."
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(buffer-substring-no-properties (line-beginning-position) (line-end-position)))
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(defun md4tj-begin-tag (tag &optional attrs)
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"Return beginning html tag for TAG with optional ATTRS."
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(concat "<" tag
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(mapconcat 'identity (cl-map 'listp (lambda (l) (concat " " (nth 0 l) "=" "\"" (nth 1 l) "\"")) attrs) "")
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">"))
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(defun md4tj-end-tag (tag)
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"Return end html tag for TAG."
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(concat "</" tag ">"))
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(defun md4tj-process-header (line)
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"Process LINE known to be header, return HTML."
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(let ((level (length (nth 0 (split-string line)))))
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(if (or (< level 0) (> level 6))
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(error (concat "Error parsing: " line "\n"))
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(concat (md4tj-begin-tag (concat "h" (number-to-string level)))
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(mapconcat 'identity (cdr (split-string line)) " ")
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(md4tj-end-tag (concat "h" (number-to-string level)))))))
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(defun md4tj-process-paragraph (line)
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"Process LINE that is paragraph, return HTML."
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(concat (md4tj-begin-tag "p") line (md4tj-end-tag "p")))
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(defun md4tj-process-line (line)
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"Process all inline elements of the LINE, return HTML."
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;; Finally strikethrough
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(replace-regexp-in-string
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"~~\\(.*\\)~~"
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"<s>\\1</s>"
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;; Then highlight
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(replace-regexp-in-string
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"==\\(.*\\)=="
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"<mark>\\1</mark>"
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;; Then links
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(replace-regexp-in-string
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"\\[\\([^\\[]*\\)](\\([^\\[(]*\\))"
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(concat (md4tj-begin-tag "a" (list '("href" "\\2"))) "\\1" (md4tj-end-tag "a"))
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;; Then images
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(replace-regexp-in-string
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"!\\[\\([^\\[]*\\)](\\([^\\[(]*\\))"
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(md4tj-begin-tag "img" (list '("src" "\\2") '("alt" "\\1")))
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;; Then videos
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(replace-regexp-in-string
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"!!\\[\\([^\\[]*\\)](\\([^\\[(]*\\))"
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(concat (md4tj-begin-tag "video" (list '("src" "\\2") '("type" "video/webm") '("controls" "true"))) "\\1" (md4tj-end-tag "video"))
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;; Then emphasis
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(replace-regexp-in-string
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"\\*\\(.*\\)\\*"
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"<em>\\1</em>"
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;; Then strong
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(replace-regexp-in-string
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"\\*\\*\\(.*\\)\\*\\*"
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"<strong>\\1</strong>"
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;; First code
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(replace-regexp-in-string
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"`\\(.*\\)`"
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"<code>\\1</code>" line)))))))))
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(defun md4tj-clean-multiline (line)
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"Clean LINE of markdown syntax for ul."
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(replace-regexp-in-string
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"^```" ""
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(replace-regexp-in-string
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"^[0-9]+\\. " ""
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(replace-regexp-in-string "^- " "" line))))
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(defun md4tj-clean-code-for-html (line)
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"Escape characters in LINE that would be misinterpreted by the browser."
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(string-replace
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"<" "<"
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(string-replace ">" ">" line)))
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(defun md4tj-convert-line-to-html (line state)
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"Process LINE with STATE and return html."
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(let ((cleanline (md4tj-clean-multiline line)))
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;; If this is a signal to include another file
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(cond ((string-match "^@@INCLUDE" line) (md4tj-parse-to-string (nth 1 (split-string line))))
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((string-match "^@@LASTUPDATED" line) (concat "Last updated: " (current-time-string)))
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;; If this is some other signal, ignore
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((string-match "^@@" line) "")
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;; Otherwise, process as normal
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(t
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(concat
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;; Beginning multiline block/ending prev multiline block
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(mapconcat #'md4tj-state-to-html state "\n")
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;; Body
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(cond ((or (eq (nth 1 state) 'code) (eq (nth 1 state) 'begincode)) (md4tj-clean-code-for-html cleanline))
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((string-match "^#+ " cleanline) (md4tj-process-header (md4tj-process-line cleanline)))
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((string= "---" cleanline) "<hr>") ;; horizontal line
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((= (length cleanline) 0) "<br/>") ;; blank line
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(t (md4tj-process-paragraph (md4tj-process-line cleanline))))
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;; End of multiline block
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(cond ((or (eq (nth 1 state) 'ul) (eq (nth 1 state) 'beginul)) "</li>")
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((or (eq (nth 1 state) 'ol) (eq (nth 1 state) 'beginol)) "</li>")
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((eq (nth 1 state) 'code) "")
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(t "")))))))
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(defun md4tj-state-to-html (state)
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"Convert STATE to html."
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(cond ((eq state 'beginul) "<ul>\n<li>")
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((eq state 'beginol) "<ol>\n<li>")
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((eq state 'begincode) "<pre>\n<code>")
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((eq state 'ul) "<li>")
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((eq state 'ol) "<li>")
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((eq state 'code) "")
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((eq state 'endul) "</ul>\n")
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((eq state 'endol) "</ol>\n")
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((eq state 'endcode) "</code>\n</pre>\n")
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(t "")))
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(defun md4tj-next-state (currline prevstate)
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"Return the state based on CURRLINE and PREVSTATE."
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(list
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;; End state
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(cond ((and (string-match "^- " currline) (or (eq prevstate 'ol) (eq prevstate 'beginol))) 'endol)
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((and (string-match "^[0-9]+\\. " currline) (or (eq prevstate 'ul) (eq prevstate 'beginul))) 'endul)
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((and (not (string-match "^- " currline)) (or (eq prevstate 'beginul) (eq prevstate 'ul))) 'endul)
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((and (not (string-match "[0-9]+\\. " currline)) (or (eq prevstate 'beginol) (eq prevstate 'ol))) 'endul)
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((and (string-match "```$" currline) (or (eq prevstate 'code) (eq prevstate 'begincode))) 'endcode)
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(t 'nothing))
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;; Begin state (or next line's prevstate)
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(cond ((and (string-match "^- " currline) (not (or (eq prevstate 'beginul) (eq prevstate 'ul))) 'beginul))
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((and (string-match "^- " currline) (or (eq prevstate 'beginul) (eq prevstate 'ul)) 'ul))
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((and (string-match "^[0-9]+\\. " currline) (not (or (eq prevstate 'beginol) (eq prevstate 'ol))) 'beginol))
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((and (string-match "^[0-9]+\\. " currline) (or (eq prevstate 'beginol) (eq prevstate 'ol)) 'ol))
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((and (string-match "^```" currline) (not (or (eq prevstate 'begincode) (eq prevstate 'code))) 'begincode))
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((and (not (string-match "```$" currline)) (or (eq prevstate 'begincode) (eq prevstate 'code)) 'code))
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(t 'normal))))
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(defun md4tj-begin ()
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"Insert beginning code for all html."
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(concat "<!DOCTYPE html>\n"
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(md4tj-begin-tag "html"
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(list (list "lang"
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(or (nth 1 (car (cl-remove-if-not (lambda (meta) (string= (car meta) "@@LANG")) (md4tj-find-metas)))) "en"))))
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"\n"))
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(defun md4tj-finalize (state)
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"Finalizes HTML document by inserting missing end tags based on STATE."
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(concat
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(cond ((or (eq state 'beginul) (eq state 'ul)) "</ul>")
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((or (eq state 'beginol) (eq state 'ol)) "</ol>")
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((or (eq state 'begincode) (eq state 'code)) "</code>")
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(t ""))
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"</body>\n"
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"</html>"))
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(defun md4tj-find-metas ()
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"Return all lines starting with @@ as list of split strings."
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(save-excursion
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(let ((meta-list nil))
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(goto-char (point-min))
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(while (re-search-forward "^@@" nil t)
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(setq meta-list (cons (split-string (getline)) meta-list)))
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meta-list)))
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(defun md4tj-list-to-tuple-list (list)
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"Convert LIST to tuple list."
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(let ((tuples nil))
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(dolist (i (number-sequence 0 (- (length list) 1) 2))
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(setq tuples (cons (cons (nth i list) (list (nth (+ i 1) list))) tuples)))
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(reverse tuples)))
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(defun md4tj-meta-to-html (meta)
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"Convert META to html."
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(cond ((string= (nth 0 meta) "@@TITLE")
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(concat "<title>" (mapconcat 'identity (cdr meta) " ") "</title>\n"))
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((string= (nth 0 meta) "@@META")
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(concat (md4tj-begin-tag "meta" (md4tj-list-to-tuple-list (cdr meta)))))
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((string= (nth 0 meta) "@@CSS")
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(concat (md4tj-begin-tag "link" (list (list "rel" "stylesheet") (list "href" (nth 1 meta))))))))
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(defun md4tj-head ()
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"Return text for head element on current buffer."
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(concat
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(md4tj-begin-tag "head") "\n"
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(mapconcat 'md4tj-meta-to-html (md4tj-find-metas) "\n")
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"\n"
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(md4tj-end-tag "head") "\n"))
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(defun md4tj-parse (mdfile outfile)
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"Entry point to parse MDFILE and output to OUTFILE."
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(let ((inbuf (generate-new-buffer " in"))
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(outbuf (generate-new-buffer " out"))
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(fullstate (list 'nothing 'normal))
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(line nil))
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(set-buffer inbuf)
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(insert-file-contents mdfile)
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(goto-char (point-min))
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(set-buffer outbuf)
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(insert (md4tj-begin))
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(insert (with-current-buffer inbuf (md4tj-head)))
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(insert (md4tj-begin-tag "body"))
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(while (with-current-buffer inbuf (< (point) (point-max)))
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(setq line (with-current-buffer inbuf (getline)))
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(setq fullstate (md4tj-next-state line (nth 1 fullstate)))
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;; Insert next line(s) into output file
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(insert (concat (md4tj-convert-line-to-html line fullstate) "\n"))
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;; Advance input file by a line
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(with-current-buffer inbuf (forward-line)))
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(insert (md4tj-finalize (nth 1 fullstate)))
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;; Write outbuf to outfile
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(write-region nil nil outfile nil)))
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(defun md4tj-parse-to-string (mdfile)
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"Parse MDFILE, return conversion to HTML as string."
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(with-temp-buffer
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(let ((acc nil)
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(line nil)
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(fullstate (list 'nothing 'normal)))
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(insert-file-contents mdfile)
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(goto-char (point-min))
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(while (< (point) (point-max))
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(setq line (getline))
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(setq fullstate (md4tj-next-state line (nth 1 fullstate)))
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(setq acc (concat acc (md4tj-convert-line-to-html line fullstate) "\n"))
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(forward-line))
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acc)))
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(provide 'md4tj_parse)
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;;; md4tj_parse.el ends here
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