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(in-package #:cl-markdown)
(defvar *current-span* nil)
(defstruct (markdown-scanner (:conc-name scanner-))
name regex priority function)
(setf (item-at-1 *spanner-parsing-environments* 'default)
(make-instance
'sorted-list-container
:sorter '<
:key 'scanner-priority
:initial-contents
`(,(make-markdown-scanner
:regex (create-scanner '(:sequence escaped-character))
:name 'escaped-character
:priority 1
:function 'convert-escape-temporarily)
,(make-markdown-scanner
:regex (create-scanner '(:sequence inline-image))
:name 'inline-image
:priority 2)
,(make-markdown-scanner :regex (create-scanner
'(:sequence reference-image))
:name 'reference-image
:priority 3)
,(make-markdown-scanner :regex (create-scanner
'(:sequence coded-reference-link))
:name 'code
:priority 4)
,(make-markdown-scanner :regex (create-scanner
'(:sequence inline-link))
:name 'inline-link
:priority 5)
,(make-markdown-scanner :regex (create-scanner
'(:sequence reference-link))
:name 'reference-link
:priority 6)
,(make-markdown-scanner :regex (create-scanner '(:sequence backtick))
:name 'code
:priority 7)
,(make-markdown-scanner :regex (create-scanner
'(:sequence strong-em-1))
:name 'strong-em
:priority 8)
,(make-markdown-scanner :regex (create-scanner
'(:sequence strong-em-2))
:name 'strong-em
:priority 9)
,(make-markdown-scanner :regex (create-scanner '(:sequence strong-2))
:name 'strong
:priority 10)
,(make-markdown-scanner :regex (create-scanner '(:sequence strong-1))
:name 'strong
:priority 11)
,(make-markdown-scanner :regex (create-scanner '(:sequence emphasis-2))
:name 'emphasis
:priority 12)
,(make-markdown-scanner :regex (create-scanner '(:sequence emphasis-1))
:name 'emphasis
:priority 13)
,(make-markdown-scanner :regex (create-scanner '(:sequence auto-link))
:name 'link
:priority 14)
,(make-markdown-scanner :regex (create-scanner '(:sequence auto-mail))
:name 'mail
:priority 15)
,(make-markdown-scanner :regex (create-scanner '(:sequence entity))
:name 'entity
:priority 16)
,(make-markdown-scanner :regex (create-scanner '(:sequence html))
:name 'html
:priority 7.5)
,(make-markdown-scanner
:regex (create-scanner '(:sequence line-ends-with-two-spaces))
:name 'break
:priority 1.8)
)))
(setf (item-at-1 *spanner-parsing-environments* '(code))
(make-instance
'sorted-list-container
:sorter '<
:key 'scanner-priority
:initial-contents
`(,(make-markdown-scanner
:regex (create-scanner '(:sequence html))
:name 'html
:priority 1)
,(make-markdown-scanner
:regex (create-scanner '(:sequence entity))
:name 'entity
:priority 2))))
(defun scanners-for-chunk (chunk)
(let ((it nil))
(cond ((setf it (item-at-1 *spanner-parsing-environments*
(markup-class chunk)))
(values it (markup-class chunk)))
(t
(values (item-at-1 *spanner-parsing-environments* 'default) nil)))))
(defmethod handle-spans ((document abstract-document))
(iterate-elements
(chunks document)
(lambda (chunk)
(handle-spans chunk)))
document)
(defmethod handle-spans ((chunk chunk))
(setf (slot-value chunk 'lines)
(bind ((lines (slot-value chunk 'lines))
((:values scanners kind) (scanners-for-chunk chunk))
(*current-span* kind))
(scan-lines-with-scanners lines scanners)))
chunk)
(defun scan-lines-with-scanners (lines scanners)
(when (or (consp lines)
(typep lines 'cl-containers:iteratable-container-mixin))
(iterate-elements
scanners
(lambda (scanner)
(let ((name (scanner-name scanner)))
(setf lines
(let ((result nil))
(iterate-elements
lines
(lambda (line)
(setf result
(append result (scan-one-span
line name scanner scanners)))))
result))))))
lines)
(defmethod scan-one-span ((line (eql nil)) scanner-name scanner scanners)
(declare (ignorable scanner-name scanner scanners))
(list ""))
(defmethod scan-one-span ((line cons) scanner-name scanner scanners)
;;?? what special case does this handle?
(if (process-span-in-span-p scanner-name (first line))
`((,(first line)
,@(let ((*current-span* (first line)))
(scan-one-span (second line) scanner-name scanner scanners))
,@(nthcdr 2 line)))
(list line)))
(defmethod process-span-in-span-p ((sub-span t) (current-span t))
(values t))
(defmethod process-span-in-span-p
((sub-span (eql nil)) (current-span (eql 'html)))
(values nil))
(defmethod process-span-in-span-p ((sub-span t) (current-span (eql 'html)))
(values nil))
(defmethod process-span-in-span-p ((sub-span (eql 'html)) (current-span t))
(values nil))
(defmethod process-span-in-span-p ((sub-span (eql 'html)) (current-span null))
(values t))
(defmethod process-span-in-span-p
((sub-span (eql 'link)) (current-span (eql 'code)))
(values nil))
(defmethod process-span-in-span-p
((sub-span (eql 'html)) (current-span (eql 'code)))
(values nil))
(defmethod process-span-in-span-p ((sub-span t) (current-span (eql 'code)))
(values nil))
(defmethod process-span-in-span-p
((sub-span t) (current-span (eql 'coded-reference-link)))
(values nil))
(defmethod scan-one-span ((line string) scanner-name scanner scanners)
#+debug
(print (list :sos scanner-name *current-span*
(process-span-in-span-p scanner-name *current-span*)
line))
(let ((found? nil)
(result nil)
(last-e 0)
(regex (scanner-regex scanner))
(scanner-fn (scanner-function scanner)))
(when (process-span-in-span-p scanner-name *current-span*)
(flet ((sub-scan (it)
(let ((*current-span* scanner-name))
(scan-lines-with-scanners it scanners))))
(do-scans (s e gs ge regex line)
(let ((registers (loop for s-value across gs
for e-value across ge
when (and (not (null s-value))
(/= s-value e-value)) collect
(sub-scan (subseq line s-value e-value)))))
(setf registers (process-span scanner-name registers))
(let ((converted
`(,@(when (plusp s)
`(,(sub-scan (subseq line last-e s))))
,(if scanner-fn
(funcall scanner-fn scanner-name registers)
`(,scanner-name ,@registers)))))
(setf found? t
last-e e
result (append result converted)))))
(when found?
(setf result
(let ((last (sub-scan (subseq line last-e))))
(if (plusp (size last))
(append result (list last))
result)))
(return-from scan-one-span
(values (combine-strings result) t))))))
(values (list line) nil))
(defun combine-strings (list)
(let ((result nil)
(current nil))
(flet ((maybe-add (something)
(when something
(setf result (nconc result (list something))))))
(iterate-elements
list
(lambda (elt)
(cond ((stringp elt)
(if current
(setf current (concatenate 'string current elt))
(setf current elt)))
(t
(maybe-add current)
(maybe-add elt)
(setf current nil)))))
(maybe-add current)
result)))
#+(or)
(ensure-same (combine-strings '("a" "b" 23 "c" "d")) ("ab" 23 "cd"))
#+(or)
(ensure-same (combine-strings '("a" "b" 23 2)) ("ab" 23 2))
#+(or)
(ensure-same (combine-strings '(1 2 3 )) (1 2 3))
#+(or)
(defmethod scan-one-span ((line string) scanner-name scanner scanners)
(let ((found? nil)
(result nil)
(last-e 0)
(regex (scanner-regex scanner))
(scanner-fn (scanner-function scanner))
(last-thing nil))
(when (process-span-in-span-p scanner-name *current-span*)
(flet ((sub-scan (it)
(let ((*current-span* scanner-name))
(scan-lines-with-scanners it scanners))))
(do-scans (s e gs ge regex line)
(let ((registers (loop for s-value across gs
for e-value across ge
when (and (not (null s-value))
(/= s-value e-value)) collect
(sub-scan (subseq line s-value e-value)))))
(setf registers (process-span scanner-name registers))
(let ((converted
`(,@(when (plusp s)
`(,(sub-scan (subseq line last-e s))))
,(if scanner-fn
(funcall scanner-fn scanner-name registers)
`(,scanner-name ,@registers)))))
(print (list :c converted last-thing))
(cond ((and (stringp converted)
(stringp last-thing))
(setf (first (last result))
(concatenate 'string last-thing converted)))
(t
(setf result (append result converted))))
(setf found? t
last-e e
last-thing converted))))
(when found?
(return-from scan-one-span
(values (let ((last (sub-scan (subseq line last-e))))
(if (plusp (size last))
(append result (list last))
result))
t))))))
(values (list line) nil))
(defun convert-escape-temporarily (scanner-name registers)
(declare (ignore scanner-name))
(assert (position (aref (first registers) 0) *escape-characters*))
(format nil "~c~c~a~c~c"
#\Null #\Null
(position (aref (first registers) 0) *escape-characters*)
#\Null #\Null))
(defmethod unconvert-escapes ((thing t))
thing)
(defmethod unconvert-escapes ((string string))
(cl-ppcre:regex-replace-all
'(:sequence escape-kludge) string
(lambda (_ &rest registers)
(declare (ignore _)
(dynamic-extent registers))
;(print registers)
(let ((ch (parse-integer (first registers))))
(string (aref *escape-characters* ch))))
:simple-calls t))
(defmethod unconvert-escapes ((thing list))
(collect-elements thing :transform #'unconvert-escapes))
(defmethod unconvert-escapes ((thing chunk))
(setf (slot-value thing 'lines)
(collect-elements (lines thing) :transform #'unconvert-escapes)))
(defmethod unconvert-escapes ((thing abstract-document))
(iterate-elements (chunks thing) #'unconvert-escapes))
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