;;; lang/web/autoload/html.el -*- lexical-binding: t; -*-

(defvar +web-entities-list
  [["&" "&"] [" " " "] [" " " "] [" " " "] [" " " "]
   ["‏" "‏"] ["‎" "‎"] ["‍" "‍"] ["‌" "‌"]
   ["¡" "¡"] ["¢" "¢"] ["£" "£"] ["¤" "¤"] ["¥" "¥"]
   ["¦" "¦"] ["§" "§"] ["¨" "¨"] ["©" "©"] ["ª" "ª"]
   ["«" "«"] ["¬" "¬"] ["­" "­"] ["®" "®"] ["¯" "¯"]
   ["°" "°"] ["±" "±"] ["²" "²"] ["³" "³"] ["´" "´"]
   ["µ" "µ"] ["¶" "¶"] ["·" "·"] ["¸" "¸"] ["¹" "¹"]
   ["º" "º"] ["»" "»"] ["¼" "¼"] ["½" "½"]
   ["¾" "¾"] ["¿" "¿"] ["À" "À"] ["Á" "Á"]
   ["Â" "Â"] ["Ã" "Ã"] ["Ä" "Ä"] ["Å" "Å"] ["Æ" "Æ"]
   ["Ç" "Ç"] ["È" "È"] ["É" "É"] ["Ê" "Ê"]
   ["Ë" "Ë"] ["Ì" "Ì"] ["Í" "Í"] ["Î" "Î"] ["Ï" "Ï"]
   ["Ð" "Ð"] ["Ñ" "Ñ"] ["Ò" "Ò"] ["Ó" "Ó"]
   ["Ô" "Ô"] ["Õ" "Õ"] ["Ö" "Ö"] ["×" "×"] ["Ø" "Ø"]
   ["Ù" "Ù"] ["Ú" "Ú"] ["Û" "Û"] ["Ü" "Ü"]
   ["Ý" "Ý"] ["Þ" "Þ"] ["ß" "ß"] ["à" "à"] ["á" "á"]
   ["â" "â"] ["ã" "ã"] ["ä" "ä"] ["å" "å"]
   ["æ" "æ"] ["ç" "ç"] ["è" "è"] ["é" "é"] ["ê" "ê"]
   ["ë" "ë"] ["ì" "ì"] ["í" "í"] ["î" "î"]
   ["ï" "ï"] ["ð" "ð"] ["ñ" "ñ"] ["ò" "ò"] ["ó" "ó"]
   ["ô" "ô"] ["õ" "õ"] ["ö" "ö"] ["÷" "÷"] ["ø" "ø"]
   ["ù" "ù"] ["ú" "ú"] ["û" "û"] ["ü" "ü"] ["ý" "ý"]
   ["þ" "þ"] ["ÿ" "ÿ"] ["ƒ" "ƒ"] ["Α" "Α"] ["Β" "Β"]
   ["Γ" "Γ"] ["Δ" "Δ"] ["Ε" "Ε"] ["Ζ" "Ζ"] ["Η" "Η"]
   ["Θ" "Θ"] ["Ι" "Ι"] ["Κ" "Κ"] ["Λ" "Λ"] ["Μ" "Μ"]
   ["Ν" "Ν"] ["Ξ" "Ξ"] ["Ο" "Ο"] ["Π" "Π"] ["Ρ" "Ρ"]
   ["Σ" "Σ"] ["Τ" "Τ"] ["Υ" "Υ"] ["Φ" "Φ"] ["Χ" "Χ"]
   ["Ψ" "Ψ"] ["Ω" "Ω"] ["α" "α"] ["β" "β"] ["γ" "γ"]
   ["δ" "δ"] ["ε" "ε"] ["ζ" "ζ"] ["η" "η"] ["θ" "θ"]
   ["ι" "ι"] ["κ" "κ"] ["λ" "λ"] ["μ" "μ"] ["ν" "ν"]
   ["ξ" "ξ"] ["ο" "ο"] ["π" "π"] ["ρ" "ρ"] ["ς" "ς"]
   ["σ" "σ"] ["τ" "τ"] ["υ" "υ"] ["φ" "φ"] ["χ" "χ"]
   ["ψ" "ψ"] ["ω" "ω"] ["ϑ" "ϑ"] ["ϒ" "ϒ"] ["ϖ" "ϖ"]
   ["•" "•"] ["…" "…"] ["′" "′"] ["″" "″"] ["‾" "‾"]
   ["⁄" "⁄"] ["℘" "℘"] ["ℑ" "ℑ"] ["ℜ" "ℜ"] ["™" "™"]
   ["ℵ" "ℵ"] ["←" "←"] ["↑" "↑"] ["→" "→"] ["↓" "↓"]
   ["↔" "↔"] ["↵" "↵"] ["⇐" "⇐"] ["⇑" "⇑"] ["⇒" "⇒"]
   ["⇓" "⇓"] ["⇔" "⇔"] ["∀" "∀"] ["∂" "∂"] ["∃" "∃"]
   ["∅" "∅"] ["∇" "∇"] ["∈" "∈"] ["∉" "∉"] ["∋" "∋"]
   ["∏" "∏"] ["∑" "∑"] ["−" "−"] ["∗" "∗"] ["√" "√"]
   ["∝" "∝"] ["∞" "∞"] ["∠" "∠"] ["∧" "∧"] ["∨" "∨"]
   ["∩" "∩"] ["∪" "∪"] ["∫" "∫"] ["∴" "∴"] ["∼" "∼"]
   ["≅" "≅"] ["≈" "≈"] ["≠" "≠"] ["≡" "≡"] ["≤" "≤"]
   ["≥" "≥"] ["⊂" "⊂"] ["⊃" "⊃"] ["⊄" "⊄"] ["⊆" "⊆"]
   ["⊇" "⊇"] ["⊕" "⊕"] ["⊗" "⊗"] ["⊥" "⊥"] ["⋅" "⋅"]
   ["⌈" "⌈"] ["⌉" "⌉"] ["⌊" "⌊"] ["⌋" "⌋"] ["⟨" "〈"]
   ["⟩" "〉"] ["◊" "◊"] ["♠" "♠"] ["♣" "♣"]
   ["♥" "♥"] ["♦" "♦"] [""" "\""] ["Œ" "Œ"] ["œ" "œ"]
   ["Š" "Š"] ["š" "š"] ["Ÿ" "Ÿ"] ["ˆ" "ˆ"]
   ["˜" "˜"] ["–" "–"] ["—" "—"] ["‘" "‘"] ["’" "’"]
   ["‚" "‚"] ["“" "“"] ["”" "”"] ["„" "„"]
   ["†" "†"] ["‡" "‡"] ["‰" "‰"] ["‹" "‹"] ["›" "›"]
   ["€" "€"]]
  "A list of sequence string pairs, representing an html entity and its decoded
character.")

(defun +web--entities-string (text &optional decode-p)
  "HTML encode/decode TEXT. Based on Xah's replace HTML named entities function
@ http://ergoemacs.org/emacs/elisp_replace_html_entities_command.html"
  (interactive "<!><r>")
  (seq-doseq (rep +web-entities-list)
    (let ((from (elt rep (if decode-p 0 1)))
          (to   (elt rep (if decode-p 1 0)))
          case-fold-search)
      (when (and (not (equal from " "))
                 (string-match-p (regexp-quote from) text))
        (setq text (replace-regexp-in-string (regexp-quote from) to text t t)))))
  text)

(defun +web--entities-region (beg end &optional decode-p)
  "HTML encode/decode the selected region. Based on Xah's replace HTML named entities
function @ http://ergoemacs.org/emacs/elisp_replace_html_entities_command.html"
  (save-restriction
    (narrow-to-region beg end)
    (seq-doseq (rep +web-entities-list)
      (let ((from (elt rep (if decode-p 0 1)))
            (to   (elt rep (if decode-p 1 0)))
            case-fold-search)
        (unless (equal from " ")
          (goto-char (point-min))
          (while (search-forward from nil t)
            (replace-match to 'FIXEDCASE 'LITERAL)))))))

;;;###autoload
(defun +web-encode-entities (text)
  "TODO"
  (+web--entities-string text nil))

;;;###autoload
(defun +web-decode-entities (text)
  "TODO"
  (+web--entities-string text t))


;;
;;; Commands

;;;###autoload
(defun +web/encode-entities-region (beg end)
  "Encode HTML entities in region."
  (interactive "r")
  (+web--entities-region beg end))

;;;###autoload
(defun +web/decode-entities-region (beg end)
  "Decode HTML entities in region."
  (interactive "r")
  (+web--entities-region beg end t))

;;;###autoload
(defun +web/indent-or-yas-or-emmet-expand ()
  "Do-what-I-mean on TAB.

Invokes `indent-for-tab-command' if at or before text bol, `yas-expand' if on a
snippet, or `emmet-expand-yas'/`emmet-expand-line', depending on whether
`yas-minor-mode' is enabled or not."
  (interactive)
  (call-interactively
   (cond ((<= (current-column) (current-indentation))
          #'indent-for-tab-command)
         ((bound-and-true-p yas-minor-mode)
          (if (yas--templates-for-key-at-point)
              #'yas-expand
            #'emmet-expand-yas))
         (#'emmet-expand-line))))