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data-service/guix-data-service/web/sxml.scm

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;;; Guix Data Service -- Information about Guix over time
;;; Copyright © 2016, 2017 Ricardo Wurmus <rekado@elephly.net>
;;; Copyright © 2015 David Thompson <davet@gnu.org>
;;; Copyright © 2019 Christopher Baines <mail@cbaines.net>
;;;
;;; This program is free software: you can redistribute it and/or
;;; modify it under the terms of the GNU Affero 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
;;; Affero General Public License for more details.
;;;
;;; You should have received a copy of the GNU Affero General Public
;;; License along with this program. If not, see
;;; <http://www.gnu.org/licenses/>.
;;; Commentary:
;;
;; SXML to HTML conversion.
;;
;;; Code:
(define-module (guix-data-service web sxml)
#:use-module (sxml simple)
#:use-module (srfi srfi-26)
#:use-module (ice-9 match)
#:use-module (ice-9 format)
#:use-module (ice-9 hash-table)
#:export (sxml->html))
(define %self-closing-tags
'(area
base
br
col
command
embed
hr
img
input
keygen
link
meta
param
source
track
wbr))
(define (self-closing-tag? tag)
"Return #t if TAG is self-closing."
(pair? (memq tag %self-closing-tags)))
(define %escape-chars
(alist->hash-table
'((#\" . "quot")
(#\& . "amp")
(#\' . "apos")
(#\< . "lt")
(#\> . "gt")
(#\¡ . "iexcl")
(#\¢ . "cent")
(#\£ . "pound")
(#\¤ . "curren")
(#\¥ . "yen")
(#\¦ . "brvbar")
(#\§ . "sect")
(#\¨ . "uml")
(#\© . "copy")
(#\ª . "ordf")
(#\« . "laquo")
(#\¬ . "not")
(#\® . "reg")
(#\¯ . "macr")
(#\° . "deg")
(#\± . "plusmn")
(#\² . "sup2")
(#\³ . "sup3")
(#\´ . "acute")
(#\µ . "micro")
(#\¶ . "para")
(#\· . "middot")
(#\¸ . "cedil")
(#\¹ . "sup1")
(#\º . "ordm")
(#\» . "raquo")
(#\¼ . "frac14")
(#\½ . "frac12")
(#\¾ . "frac34")
(#\¿ . "iquest")
(#\À . "Agrave")
(#\Á . "Aacute")
(#\Â . "Acirc")
(#\Ã . "Atilde")
(#\Ä . "Auml")
(#\Å . "Aring")
(#\Æ . "AElig")
(#\Ç . "Ccedil")
(#\È . "Egrave")
(#\É . "Eacute")
(#\Ê . "Ecirc")
(#\Ë . "Euml")
(#\Ì . "Igrave")
(#\Í . "Iacute")
(#\Î . "Icirc")
(#\Ï . "Iuml")
(#\Ð . "ETH")
(#\Ñ . "Ntilde")
(#\Ò . "Ograve")
(#\Ó . "Oacute")
(#\Ô . "Ocirc")
(#\Õ . "Otilde")
(#\Ö . "Ouml")
(#\× . "times")
(#\Ø . "Oslash")
(#\Ù . "Ugrave")
(#\Ú . "Uacute")
(#\Û . "Ucirc")
(#\Ü . "Uuml")
(#\Ý . "Yacute")
(#\Þ . "THORN")
(#\ß . "szlig")
(#\à . "agrave")
(#\á . "aacute")
(#\â . "acirc")
(#\ã . "atilde")
(#\ä . "auml")
(#\å . "aring")
(#\æ . "aelig")
(#\ç . "ccedil")
(#\è . "egrave")
(#\é . "eacute")
(#\ê . "ecirc")
(#\ë . "euml")
(#\ì . "igrave")
(#\í . "iacute")
(#\î . "icirc")
(#\ï . "iuml")
(#\ð . "eth")
(#\ñ . "ntilde")
(#\ò . "ograve")
(#\ó . "oacute")
(#\ô . "ocirc")
(#\õ . "otilde")
(#\ö . "ouml")
(#\÷ . "divide")
(#\ø . "oslash")
(#\ù . "ugrave")
(#\ú . "uacute")
(#\û . "ucirc")
(#\ü . "uuml")
(#\ý . "yacute")
(#\þ . "thorn")
(#\ÿ . "yuml")
(#\Π. "OElig")
(#\œ . "oelig")
(#\Š . "Scaron")
(#\š . "scaron")
(#\Ÿ . "Yuml")
(#\ƒ . "fnof")
(#\ˆ . "circ")
(#\˜ . "tilde")
(#\Α . "Alpha")
(#\Β . "Beta")
(#\Γ . "Gamma")
(#\Δ . "Delta")
(#\Ε . "Epsilon")
(#\Ζ . "Zeta")
(#\Η . "Eta")
(#\Θ . "Theta")
(#\Ι . "Iota")
(#\Κ . "Kappa")
(#\Λ . "Lambda")
(#\Μ . "Mu")
(#\Ν . "Nu")
(#\Ξ . "Xi")
(#\Ο . "Omicron")
(#\Π . "Pi")
(#\Ρ . "Rho")
(#\Σ . "Sigma")
(#\Τ . "Tau")
(#\Υ . "Upsilon")
(#\Φ . "Phi")
(#\Χ . "Chi")
(#\Ψ . "Psi")
(#\Ω . "Omega")
(#\α . "alpha")
(#\β . "beta")
(#\γ . "gamma")
(#\δ . "delta")
(#\ε . "epsilon")
(#\ζ . "zeta")
(#\η . "eta")
(#\θ . "theta")
(#\ι . "iota")
(#\κ . "kappa")
(#\λ . "lambda")
(#\μ . "mu")
(#\ν . "nu")
(#\ξ . "xi")
(#\ο . "omicron")
(#\π . "pi")
(#\ρ . "rho")
(#\ς . "sigmaf")
(#\σ . "sigma")
(#\τ . "tau")
(#\υ . "upsilon")
(#\φ . "phi")
(#\χ . "chi")
(#\ψ . "psi")
(#\ω . "omega")
(#\ϑ . "thetasym")
(#\ϒ . "upsih")
(#\ϖ . "piv")
(#\  . "ensp")
(#\  . "emsp")
(#\  . "thinsp")
(#\– . "ndash")
(#\— . "mdash")
(#\‘ . "lsquo")
(#\’ . "rsquo")
(#\‚ . "sbquo")
(#\“ . "ldquo")
(#\” . "rdquo")
(#\„ . "bdquo")
(#\† . "dagger")
(#\‡ . "Dagger")
(#\• . "bull")
(#\… . "hellip")
(#\‰ . "permil")
(#\′ . "prime")
(#\″ . "Prime")
(#\‹ . "lsaquo")
(#\› . "rsaquo")
(#\‾ . "oline")
(#\⁄ . "frasl")
(#\€ . "euro")
(#\ℑ . "image")
(#\℘ . "weierp")
(#\ℜ . "real")
(#\™ . "trade")
(#\ℵ . "alefsym")
(#\← . "larr")
(#\↑ . "uarr")
(#\→ . "rarr")
(#\↓ . "darr")
(#\↔ . "harr")
(#\↵ . "crarr")
(#\⇐ . "lArr")
(#\⇑ . "uArr")
(#\⇒ . "rArr")
(#\⇓ . "dArr")
(#\⇔ . "hArr")
(#\∀ . "forall")
(#\∂ . "part")
(#\∃ . "exist")
(#\∅ . "empty")
(#\∇ . "nabla")
(#\∈ . "isin")
(#\∉ . "notin")
(#\∋ . "ni")
(#\∏ . "prod")
(#\∑ . "sum")
(#\− . "minus")
(#\∗ . "lowast")
(#\√ . "radic")
(#\∝ . "prop")
(#\∞ . "infin")
(#\∠ . "ang")
(#\∧ . "and")
(#\∨ . "or")
(#\∩ . "cap")
(#\∪ . "cup")
(#\∫ . "int")
(#\∴ . "there4")
(#\∼ . "sim")
(#\≅ . "cong")
(#\≈ . "asymp")
(#\≠ . "ne")
(#\≡ . "equiv")
(#\≤ . "le")
(#\≥ . "ge")
(#\⊂ . "sub")
(#\⊃ . "sup")
(#\⊄ . "nsub")
(#\⊆ . "sube")
(#\⊇ . "supe")
(#\⊕ . "oplus")
(#\⊗ . "otimes")
(#\⊥ . "perp")
(#\⋅ . "sdot")
(#\⋮ . "vellip")
(#\⌈ . "lceil")
(#\⌉ . "rceil")
(#\⌊ . "lfloor")
(#\⌋ . "rfloor")
(#\〈 . "lang")
(#\〉 . "rang")
(#\◊ . "loz")
(#\♠ . "spades")
(#\♣ . "clubs")
(#\♥ . "hearts")
(#\♦ . "diams"))))
(define (string->escaped-html s port)
"Write the HTML escaped form of S to PORT."
(define (escape c)
(let ((escaped (hash-ref %escape-chars c)))
(if escaped
(format port "&~a;" escaped)
(display c port))))
(string-for-each escape s))
(define (object->escaped-html obj port)
"Write the HTML escaped form of OBJ to PORT."
(string->escaped-html
(call-with-output-string (cut display obj <>))
port))
(define (attribute-value->html value port)
"Write the HTML escaped form of VALUE to PORT."
(if (string? value)
(string->escaped-html value port)
(object->escaped-html value port)))
(define (attribute->html attr value port)
"Write ATTR and VALUE to PORT."
(format port "~a=\"" attr)
(attribute-value->html value port)
(display #\" port))
(define (element->html tag attrs body port)
"Write the HTML TAG to PORT, where TAG has the attributes in the
list ATTRS and the child nodes in BODY."
(format port "<~a" tag)
(for-each (match-lambda
((attr value)
(display #\space port)
(attribute->html attr value port)))
attrs)
(if (and (null? body) (self-closing-tag? tag))
(display " />" port)
(begin
(display #\> port)
(for-each (cut sxml->html <> port) body)
(format port "</~a>" tag))))
(define (doctype->html doctype port)
(format port "<!DOCTYPE ~a>" doctype))
(define* (sxml->html tree #:optional (port (current-output-port)))
"Write the serialized HTML form of TREE to PORT."
(match tree
(() *unspecified*)
(('doctype type)
(doctype->html type port))
;; Unescaped, raw HTML output
(('raw html)
(display html port))
(((? symbol? tag) ('@ attrs ...) body ...)
(element->html tag attrs body port))
(((? symbol? tag) body ...)
(element->html tag '() body port))
((nodes ...)
(for-each (cut sxml->html <> port) nodes))
((? string? text)
(string->escaped-html text port))
;; Render arbitrary Scheme objects, too.
(obj (object->escaped-html obj port))))
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