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183ea40ed1
gecko-dev/js2/semantics/HTML.lisp
waldemar%netscape.com 78be7c3fee Added support for lookahead constraints
1999-06-03 20:52:04 +00:00

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;;; The contents of this file are subject to the Netscape Public License
;;; Version 1.0 (the "NPL"); you may not use this file except in
;;; compliance with the NPL. You may obtain a copy of the NPL at
;;; http://www.mozilla.org/NPL/
;;;
;;; Software distributed under the NPL is distributed on an "AS IS" basis,
;;; WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
;;; for the specific language governing rights and limitations under the
;;; NPL.
;;;
;;; The Initial Developer of this code under the NPL is Netscape
;;; Communications Corporation. Portions created by Netscape are
;;; Copyright (C) 1999 Netscape Communications Corporation. All Rights
;;; Reserved.
;;;
;;; HTML output generator
;;;
;;; Waldemar Horwat (waldemar@netscape.com)
;;;
;;; ------------------------------------------------------------------------------------------------------
;;; ELEMENTS
(defstruct (html-element (:constructor make-html-element (name self-closing indent
newlines-before newlines-begin newlines-end newlines-after))
(:predicate html-element?))
(name nil :type symbol :read-only t) ;Name of the tag
(self-closing nil :type bool :read-only t) ;True if the closing tag should be omitted
(indent nil :type integer :read-only t) ;Number of spaces by which to indent this tag's contents in HTML source
(newlines-before nil :type integer :read-only t) ;Number of HTML source newlines preceding the opening tag
(newlines-begin nil :type integer :read-only t) ;Number of HTML source newlines immediately following the opening tag
(newlines-end nil :type integer :read-only t) ;Number of HTML source newlines immediately preceding the closing tag
(newlines-after nil :type integer :read-only t)) ;Number of HTML source newlines following the closing tag
; Define symbol to refer to the given html-element.
(defun define-html (symbol newlines-before newlines-begin newlines-end newlines-after &key self-closing (indent 0))
(setf (get symbol 'html-element) (make-html-element symbol self-closing indent
newlines-before newlines-begin newlines-end newlines-after)))
;;; ------------------------------------------------------------------------------------------------------
;;; ELEMENT DEFINITIONS
(define-html 'a 0 0 0 0)
(define-html 'b 0 0 0 0)
(define-html 'blockquote 1 0 0 1 :indent 2)
(define-html 'body 1 1 1 1)
(define-html 'br 0 0 0 1 :self-closing t)
(define-html 'code 0 0 0 0)
(define-html 'dd 1 0 0 1 :indent 2)
(define-html 'del 0 0 0 0)
(define-html 'div 1 0 0 1 :indent 2)
(define-html 'dl 1 0 0 2 :indent 2)
(define-html 'dt 1 0 0 1 :indent 2)
(define-html 'em 0 0 0 0)
(define-html 'h1 2 0 0 2 :indent 2)
(define-html 'h2 2 0 0 2 :indent 2)
(define-html 'h3 2 0 0 2 :indent 2)
(define-html 'h4 1 0 0 2 :indent 2)
(define-html 'h5 1 0 0 2 :indent 2)
(define-html 'h6 1 0 0 2 :indent 2)
(define-html 'head 1 1 1 2)
(define-html 'hr 1 0 0 1 :self-closing t)
(define-html 'html 0 1 1 1)
(define-html 'i 0 0 0 0)
(define-html 'li 1 0 0 1 :indent 2)
(define-html 'link 1 0 0 1 :self-closing t)
(define-html 'ol 1 1 1 2 :indent 2)
(define-html 'p 1 0 0 2)
(define-html 'script 0 0 0 0)
(define-html 'span 0 0 0 0)
(define-html 'strong 0 0 0 0)
(define-html 'sub 0 0 0 0)
(define-html 'sup 0 0 0 0)
(define-html 'table 1 1 1 2)
(define-html 'td 1 0 0 1 :indent 2)
(define-html 'th 1 0 0 1 :indent 2)
(define-html 'title 1 0 0 1)
(define-html 'tr 1 0 0 1 :indent 2)
(define-html 'u 0 0 0 0)
(define-html 'ul 1 1 1 2 :indent 2)
(define-html 'var 0 0 0 0)
;;; ------------------------------------------------------------------------------------------------------
;;; ATTRIBUTES
;;; The following element attributes require their values to always be in quotes.
(dolist (attribute '(alt href name))
(setf (get attribute 'quoted-attribute) t))
;;; ------------------------------------------------------------------------------------------------------
;;; ENTITIES
(defvar *html-entities-list*
'((#\& . "amp")
(#\" . "quot")
(#\< . "lt")
(#\> . "gt")
(nbsp . "nbsp")))
(defvar *html-entities-hash* (make-hash-table))
(dolist (entity-binding *html-entities-list*)
(setf (gethash (first entity-binding) *html-entities-hash*) (rest entity-binding)))
; Return a freshly consed list of <html-source> that represent the characters in the string except that
; '&', '<', and '>' are replaced by their entities and spaces are replaced by the entity
; given by the space parameter (which should be either 'space or 'nbsp).
(defun escape-html-characters (string space)
(let ((html-sources nil))
(labels
((escape-remainder (start)
(let ((i (position-if #'(lambda (char) (member char '(#\& #\< #\> #\space))) string :start start)))
(if i
(let ((char (char string i)))
(unless (= i start)
(push (subseq string start i) html-sources))
(push (if (eql char #\space) space char) html-sources)
(escape-remainder (1+ i)))
(push (if (zerop start) string (subseq string start)) html-sources)))))
(unless (zerop (length string))
(escape-remainder 0))
(nreverse html-sources))))
; Escape all content strings in the html-source, while interpreting :nowrap, :wrap, and :none pseudo-tags.
; Return a freshly consed list of html-sources.
(defun escape-html-source (html-source space)
(cond
((stringp html-source)
(escape-html-characters html-source space))
((or (characterp html-source) (symbolp html-source) (integerp html-source))
(list html-source))
((consp html-source)
(let ((tag (first html-source))
(contents (rest html-source)))
(case tag
(:none (mapcan #'(lambda (html-source) (escape-html-source html-source space)) contents))
(:nowrap (mapcan #'(lambda (html-source) (escape-html-source html-source 'nbsp)) contents))
(:wrap (mapcan #'(lambda (html-source) (escape-html-source html-source 'space)) contents))
(t (list (cons tag
(mapcan #'(lambda (html-source) (escape-html-source html-source space)) contents)))))))
(t (error "Bad html-source: ~S" html-source))))
; Escape all content strings in the html-source, while interpreting :nowrap, :wrap, and :none pseudo-tags.
(defun escape-html (html-source)
(let ((results (escape-html-source html-source 'space)))
(assert-true (= (length results) 1))
(first results)))
;;; ------------------------------------------------------------------------------------------------------
;;; HTML WRITER
;; <html-source> has one of the following formats:
;; <string> ;String to be printed literally
;; <symbol> ;Named entity
;; <integer> ;Numbered entity
;; space ;Space or newline
;; (<tag> <html-source> ... <html-source>) ;Tag and its contents
;; ((:nest <tag> ... <tag>) <html-source> ... <html-source>) ;Equivalent to (<tag> (... (<tag> <html-source> ... <html-source>)))
;;
;; <tag> has one of the following formats:
;; <symbol> ;Tag with no attributes
;; (<symbol> <attribute> ... <attribute>) ;Tag with attributes
;; :nowrap ;Pseudo-tag indicating that spaces in contents should be non-breaking
;; :wrap ;Pseudo-tag indicating that spaces in contents should be breaking
;; :none ;Pseudo-tag indicating no tag -- the contents should be inlined
;;
;; <attribute> has one of the following formats:
;; (<symbol> <string>) ;Attribute name and value
;; (<symbol>) ;Attribute name with omitted value
(defparameter *html-right-margin* 100)
(defparameter *allow-line-breaks-in-tags* nil) ;Allow line breaks in tags between attributes?
(defvar *current-html-pos*) ;Number of characters written to the current line of the stream; nil if *current-html-newlines* is nonzero
(defvar *current-html-pending*) ;String following a space or newline pending to be printed on the current line or nil if none
(defvar *current-html-indent*) ;Indent to use for emit-html-newlines-and-indent calls
(defvar *current-html-newlines*) ;Number of consecutive newlines just written to the stream; zero if last character wasn't a newline
; Flush *current-html-pending* onto the stream.
(defun flush-current-html-pending (stream)
(when *current-html-pending*
(unless (zerop (length *current-html-pending*))
(write-char #\space stream)
(write-string *current-html-pending* stream)
(incf *current-html-pos* (1+ (length *current-html-pending*))))
(setq *current-html-pending* nil)))
; Emit n-newlines onto the stream and indent the next line by *current-html-indent* spaces.
(defun emit-html-newlines-and-indent (stream n-newlines)
(decf n-newlines *current-html-newlines*)
(when (plusp n-newlines)
(flush-current-html-pending stream)
(dotimes (i n-newlines)
(write-char #\newline stream))
(incf *current-html-newlines* n-newlines)
(setq *current-html-pos* nil)))
; Write the string to the stream, observing *current-html-pending* and *current-html-pos*.
(defun write-html-string (stream html-string)
(unless (zerop (length html-string))
(unless *current-html-pos*
(setq *current-html-newlines* 0)
(write-string (make-string *current-html-indent* :initial-element #\space) stream)
(setq *current-html-pos* *current-html-indent*))
(if *current-html-pending*
(progn
(setq *current-html-pending* (if (zerop (length *current-html-pending*))
html-string
(concatenate 'string *current-html-pending* html-string)))
(when (>= (+ *current-html-pos* (length *current-html-pending*)) *html-right-margin*)
(write-char #\newline stream)
(write-string *current-html-pending* stream)
(setq *current-html-pos* (length *current-html-pending*))
(setq *current-html-pending* nil)))
(progn
(write-string html-string stream)
(incf *current-html-pos* (length html-string))))))
; Return true if the value string contains a character that would require an attribute to be quoted.
; For convenience, this returns true if value contains a period, even though strictly speaking periods do
; not force quoting.
(defun attribute-value-needs-quotes (value)
(dotimes (i (length value) nil)
(let ((ch (char value i)))
(unless (or (char<= #\0 ch #\9) (char<= #\A ch #\Z) (char<= #\a ch #\z) (char= ch #\-))
(return t)))))
; Emit the html tag with the given tag-symbol (name), attributes, and contents.
(defun write-html-tag (stream tag-symbol attributes contents)
(let ((element (assert-non-null (get tag-symbol 'html-element))))
(emit-html-newlines-and-indent stream (html-element-newlines-before element))
(write-html-string stream (format nil "<~A" (html-element-name element)))
(let ((*current-html-indent* (+ *current-html-indent* (html-element-indent element))))
(dolist (attribute attributes)
(let ((name (first attribute))
(value (second attribute)))
(write-html-source stream (if *allow-line-breaks-in-tags* 'space #\space))
(write-html-string stream (string-downcase (symbol-name name)))
(when value
(write-html-string
stream
(format nil
(if (or (attribute-value-needs-quotes value)
(get name 'quoted-attribute))
"=\"~A\""
"=~A")
value)))))
(write-html-string stream ">")
(emit-html-newlines-and-indent stream (html-element-newlines-begin element))
(dolist (html-source contents)
(write-html-source stream html-source)))
(unless (html-element-self-closing element)
(emit-html-newlines-and-indent stream (html-element-newlines-end element))
(write-html-string stream (format nil "</~A>" (html-element-name element))))
(emit-html-newlines-and-indent stream (html-element-newlines-after element))))
; Write html-source to the character stream.
(defun write-html-source (stream html-source)
(cond
((stringp html-source)
(write-html-string stream html-source))
((eq html-source 'space)
(when (zerop *current-html-newlines*)
(flush-current-html-pending stream)
(setq *current-html-pending* "")))
((or (characterp html-source) (symbolp html-source))
(let ((entity-name (gethash html-source *html-entities-hash*)))
(cond
(entity-name
(write-html-string stream (format nil "&~A;" entity-name)))
((characterp html-source)
(write-html-string stream (string html-source)))
(t (error "Bad html-source ~S" html-source)))))
((integerp html-source)
(assert-true (and (>= html-source 0) (< html-source 65536)))
(write-html-string stream (format nil "&#~D;" html-source)))
((consp html-source)
(let ((tag (first html-source))
(contents (rest html-source)))
(if (consp tag)
(write-html-tag stream (first tag) (rest tag) contents)
(write-html-tag stream tag nil contents))))
(t (error "Bad html-source: ~S" html-source))))
; Write the top-level html-source to the character stream.
(defun write-html (html-source &optional (stream t))
(with-standard-io-syntax
(let ((*print-readably* nil)
(*print-escape* nil)
(*print-case* :upcase)
(*current-html-pos* nil)
(*current-html-pending* nil)
(*current-html-indent* 0)
(*current-html-newlines* 9999))
(write-string "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.0 Transitional//EN\" \"http://www.w3.org/TR/REC-html40/loose.dtd\">" stream)
(write-char #\newline stream)
(write-html-source stream (escape-html html-source)))))
; Write html to the text file with the given name (relative to the
; local directory).
(defun write-html-to-local-file (filename html)
(with-open-file (stream (merge-pathnames filename *semantic-engine-directory*)
:direction :output
:if-exists :supersede
#+mcl :mac-file-creator #+mcl "MOSS")
(write-html html stream)))
; Expand the :nest constructs inside html-source.
(defun unnest-html-source (html-source)
(labels
((unnest-tags (tags contents)
(assert-true tags)
(cons (first tags)
(if (endp (rest tags))
contents
(list (unnest-tags (rest tags) contents))))))
(if (consp html-source)
(let ((tag (first html-source))
(contents (rest html-source)))
(if (and (consp tag) (eq (first tag) ':nest))
(unnest-html-source (unnest-tags (rest tag) contents))
(cons tag (mapcar #'unnest-html-source contents))))
html-source)))
;;; ------------------------------------------------------------------------------------------------------
;;; HTML MAPPINGS
(defparameter *html-definitions*
'(((:new-line t) (br))
;Misc.
(:spc nbsp)
(:tab2 nbsp nbsp)
(:tab3 nbsp nbsp nbsp)
(:nbhy "-") ;Non-breaking hyphen
;Symbols (-10 suffix means 10-point, etc.)
((:bullet 1) (:script "document.write(U_bull)")) ;#x2022
((:minus 1) "-")
((:not-equal 1) (:script "document.write(U_ne)")) ;#x2260
((:less-or-equal 1) (:script "document.write(U_le)")) ;#x2264
((:greater-or-equal 1) (:script "document.write(U_ge)")) ;#x2265
((:infinity 1) (:script "document.write(U_infin)")) ;#x221E
((:left-single-quote 1) #x2018)
((:right-single-quote 1) #x2019)
((:left-double-quote 1) #x201C)
((:right-double-quote 1) #x201D)
((:left-angle-quote 1) #x00AB)
((:right-angle-quote 1) #x00BB)
((:bottom-10 1) (:script "document.write(U_perp)")) ;#x22A5
((:vector-assign-10 1) (:script "document.write(U_larr)")) ;#x2190
((:up-arrow-10 1) (:script "document.write(U_uarr)")) ;#x2191
((:function-arrow-10 2) (:script "document.write(U_rarr)")) ;#x2192
((:cartesian-product-10 2) (:script "document.write(U_times)")) ;#x00D7
((:identical-10 2) (:script "document.write(U_equiv)")) ;#x2261
((:circle-plus-10 2) (:script "document.write(U_oplus)")) ;#x2295
((:intersection-10 1) (:script "document.write(U_cap)")) ;#x2229
((:union-10 1) (:script "document.write(U_cup)")) ;#x222A
((:member-10 2) (:script "document.write(U_isin)")) ;#x2208
((:not-member-10 2) (:script "document.write(U_notin)")) ;#x2209
((:derives-10 2) (:script "document.write(U_rArr)")) ;#x21D2
((:left-triangle-bracket-10 1) (:script "document.write(U_lang)")) ;#x2329
((:right-triangle-bracket-10 1) (:script "document.write(U_rang)")) ;#x232A
((:alpha 1) (:symbol "a"))
((:beta 1) (:symbol "b"))
((:chi 1) (:symbol "c"))
((:delta 1) (:symbol "d"))
((:epsilon 1) (:symbol "e"))
((:phi 1) (:symbol "f"))
((:gamma 1) (:symbol "g"))
((:eta 1) (:symbol "h"))
((:iota 1) (:symbol "i"))
((:kappa 1) (:symbol "k"))
((:lambda 1) (:symbol "l"))
((:mu 1) (:symbol "m"))
((:nu 1) (:symbol "n"))
((:omicron 1) (:symbol "o"))
((:pi 1) (:symbol "p"))
((:theta 1) (:symbol "q"))
((:rho 1) (:symbol "r"))
((:sigma 1) (:symbol "s"))
((:tau 1) (:symbol "t"))
((:upsilon 1) (:symbol "u"))
((:omega 1) (:symbol "w"))
((:xi 1) (:symbol "x"))
((:psi 1) (:symbol "y"))
((:zeta 1) (:symbol "z"))
;Block Styles
(:body-text p)
(:section-heading h2)
(:subsection-heading h3)
(:grammar-header h4)
(:grammar-rule (:nest :nowrap (div (class "grammar-rule"))))
(:grammar-lhs (:nest :nowrap (div (class "grammar-lhs"))))
(:grammar-lhs-last :grammar-lhs)
(:grammar-rhs (:nest :nowrap (div (class "grammar-rhs"))))
(:grammar-rhs-last :grammar-rhs)
(:grammar-argument (:nest :nowrap (div (class "grammar-argument"))))
(:semantics (:nest :nowrap (p (class "semantics"))))
(:semantics-next (:nest :nowrap (p (class "semantics-next"))))
;Inline Styles
(:script (script (type "text/javascript")))
(:symbol (span (class "symbol")))
(:character-literal code)
(:character-literal-control (span (class "control")))
(:terminal (span (class "terminal")))
(:terminal-keyword (code (class "terminal-keyword")))
(:nonterminal (var (class "nonterminal")))
(:nonterminal-attribute (span (class "nonterminal-attribute")))
(:nonterminal-argument (span (class "nonterminal-argument")))
(:semantic-keyword (span (class "semantic-keyword")))
(:type-expression (span (class "type-expression")))
(:type-name (span (class "type-name")))
(:field-name (span (class "field-name")))
(:global-variable (span (class "global-variable")))
(:local-variable (span (class "local-variable")))
(:action-name (span (class "action-name")))
(:text :wrap)
;Specials
(:invisible del)
((:but-not 6) (b "except"))
((:begin-negative-lookahead 13) "[lookahead" :not-member-10 "{")
((:end-negative-lookahead 2) "}]")
(:subscript sub)
(:superscript sup)
(:plain-subscript :subscript)
((:action-begin 1) "[")
((:action-end 1) "]")
((:vector-begin 1) (b "["))
((:vector-end 1) (b "]"))
((:empty-vector 2) (b "[]"))
((:vector-append 2) :circle-plus-10)
((:tuple-begin 1) (b :left-triangle-bracket-10))
((:tuple-end 1) (b :right-triangle-bracket-10))
((:unit 4) (:global-variable "unit"))
((:true 4) (:global-variable "true"))
((:false 5) (:global-variable "false"))
))
;;; ------------------------------------------------------------------------------------------------------
;;; HTML STREAMS
(defstruct (html-stream (:include markup-stream)
(:constructor allocate-html-stream (env head tail level logical-position anchors))
(:copier nil)
(:predicate html-stream?))
(anchors nil :type list :read-only t)) ;A mutable cons cell for accumulating anchors at the beginning of a paragraph
; ;or nil if not inside a paragraph.
(defmethod print-object ((html-stream html-stream) stream)
(print-unreadable-object (html-stream stream :identity t)
(write-string "html-stream" stream)))
; Make a new, empty, open html-stream with the given definitions for its markup-env.
(defun make-html-stream (markup-env level logical-position anchors)
(let ((head (list nil)))
(allocate-html-stream markup-env head head level logical-position anchors)))
; Make a new, empty, open, top-level html-stream with the given definitions
; for its markup-env. If links is true, allow links.
(defun make-top-level-html-stream (html-definitions links)
(let ((head (list nil))
(markup-env (make-markup-env links)))
(markup-env-define-alist markup-env html-definitions)
(allocate-html-stream markup-env head head *markup-stream-top-level* nil nil)))
; Return the approximate width of the html item; return t if it is a line break.
; Also allow html tags as long as they do not contain line breaks.
(defmethod markup-group-width ((html-stream html-stream) item)
(if (consp item)
(reduce #'+ (rest item) :key #'(lambda (subitem) (markup-group-width html-stream subitem)))
(markup-width html-stream item)))
; Create a top-level html-stream and call emitter to emit its contents.
; emitter takes one argument -- an html-stream to which it should emit paragraphs.
; Return the top-level html-stream. If links is true, allow links.
(defun depict-html-top-level (title links emitter)
(let ((html-stream (make-top-level-html-stream *html-definitions* links)))
(markup-stream-append1 html-stream 'html)
(depict-block-style (html-stream 'head)
(depict-block-style (html-stream 'title)
(markup-stream-append1 html-stream title))
(markup-stream-append1 html-stream '((link (rel "stylesheet") (href "../styles.css"))))
(markup-stream-append1 html-stream '((script (type "text/javascript") (language "JavaScript1.2") (src "../unicodeCompatibility.js")))))
(depict-block-style (html-stream 'body)
(funcall emitter html-stream))
(let ((links (markup-env-links (html-stream-env html-stream))))
(warn-missing-links links))
html-stream))
; Create a top-level html-stream and call emitter to emit its contents.
; emitter takes one argument -- an html-stream to which it should emit paragraphs.
; Write the resulting html to the text file with the given name (relative to the
; local directory).
; If links is true, allow links. If external-link-base is also provided, emit links for
; predefined items and assume that they are located on the page specified by the
; external-link-base string.
(defun depict-html-to-local-file (filename title links emitter &key external-link-base)
(let* ((*external-link-base* external-link-base)
(top-html-stream (depict-html-top-level title links emitter)))
(write-html-to-local-file filename (markup-stream-output top-html-stream)))
filename)
; Return the markup accumulated in the markup-stream after expanding all of its macros.
; The markup-stream is closed after this function is called.
(defmethod markup-stream-output ((html-stream html-stream))
(unnest-html-source
(markup-env-expand (markup-stream-env html-stream) (markup-stream-unexpanded-output html-stream) '(:none :nowrap :wrap :nest))))
(defmethod depict-block-style-f ((html-stream html-stream) block-style emitter)
(assert-true (<= (markup-stream-level html-stream) *markup-stream-paragraph-level*))
(assert-true (and block-style (symbolp block-style)))
(let ((inner-html-stream (make-html-stream (markup-stream-env html-stream) *markup-stream-paragraph-level* nil nil)))
(markup-stream-append1 inner-html-stream block-style)
(prog1
(funcall emitter inner-html-stream)
(markup-stream-append1 html-stream (markup-stream-unexpanded-output inner-html-stream)))))
(defmethod depict-paragraph-f ((html-stream html-stream) paragraph-style emitter)
(assert-true (= (markup-stream-level html-stream) *markup-stream-paragraph-level*))
(assert-true (and paragraph-style (symbolp paragraph-style)))
(let* ((anchors (list 'anchors))
(inner-html-stream (make-html-stream (markup-stream-env html-stream)
*markup-stream-content-level*
(make-logical-position)
anchors)))
(prog1
(funcall emitter inner-html-stream)
(markup-stream-append1 html-stream (cons paragraph-style
(nreconc (cdr anchors)
(markup-stream-unexpanded-output inner-html-stream)))))))
(defmethod depict-char-style-f ((html-stream html-stream) char-style emitter)
(assert-true (>= (markup-stream-level html-stream) *markup-stream-content-level*))
(assert-true (and char-style (symbolp char-style)))
(let ((inner-html-stream (make-html-stream (markup-stream-env html-stream)
*markup-stream-content-level*
(markup-stream-logical-position html-stream)
(html-stream-anchors html-stream))))
(markup-stream-append1 inner-html-stream char-style)
(prog1
(funcall emitter inner-html-stream)
(markup-stream-append1 html-stream (markup-stream-unexpanded-output inner-html-stream)))))
(defmethod depict-anchor ((html-stream html-stream) link-prefix link-name duplicate)
(assert-true (= (markup-stream-level html-stream) *markup-stream-content-level*))
(let* ((links (markup-env-links (html-stream-env html-stream)))
(name (record-link-definition links link-prefix link-name duplicate)))
(when name
(push (list (list 'a (list 'name name))) (cdr (html-stream-anchors html-stream))))))
(defmethod depict-link-reference-f ((html-stream html-stream) link-prefix link-name external emitter)
(assert-true (= (markup-stream-level html-stream) *markup-stream-content-level*))
(let* ((links (markup-env-links (html-stream-env html-stream)))
(href (record-link-reference links link-prefix link-name external)))
(if href
(let ((inner-html-stream (make-html-stream (markup-stream-env html-stream)
*markup-stream-content-level*
(markup-stream-logical-position html-stream)
(html-stream-anchors html-stream))))
(markup-stream-append1 inner-html-stream (list 'a (list 'href href)))
(prog1
(funcall emitter inner-html-stream)
(markup-stream-append1 html-stream (markup-stream-unexpanded-output inner-html-stream))))
(funcall emitter html-stream))))
#|
(write-html
'(html
(head
(:nowrap (title "This is my title!<>")))
((body (atr1 "abc") (beta) (qq))
"My page this is " (br) (p))))
|#
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