Function: ruby-parse-partial

ruby-parse-partial is a byte-compiled function defined in ruby-mode.el.gz.

Signature

(ruby-parse-partial &optional END IN-STRING NEST DEPTH PCOL INDENT)

Documentation

TODO: document throughout function body.

Source Code

;; Defined in /usr/src/emacs/lisp/progmodes/ruby-mode.el.gz
(defun ruby-parse-partial (&optional end in-string nest depth pcol indent)
  ;; FIXME: Document why we can't just use parse-partial-sexp.
  "TODO: document throughout function body."
  (or depth (setq depth 0))
  (or indent (setq indent 0))
  (when (re-search-forward ruby-delimiter end 'move)
    (let ((pnt (point)) w re expand)
      (goto-char (match-beginning 0))
      (cond
       ((and (memq (char-before) '(?@ ?$)) (looking-at "\\sw"))
        (goto-char pnt))
       ((looking-at "[\"`]")            ;skip string
        (cond
         ((and (not (eobp))
               (ruby-forward-string (buffer-substring (point) (1+ (point)))
                                    end t t))
          nil)
         (t
          (setq in-string (point))
          (goto-char end))))
       ((looking-at "'")
        (cond
         ((and (not (eobp))
               (re-search-forward "[^\\]\\(\\\\\\\\\\)*'" end t))
          nil)
         (t
          (setq in-string (point))
          (goto-char end))))
       ((looking-at "/=")
        (goto-char pnt))
       ((looking-at "/")
        (cond
         ((and (not (eobp)) (ruby-expr-beg 'expr-re))
          (if (ruby-forward-string "/" end t t)
              nil
            (setq in-string (point))
            (goto-char end)))
         (t
          (goto-char pnt))))
       ((looking-at "%")
        (cond
         ((and (not (eobp))
               (ruby-expr-beg 'expr-qstr)
               (not (looking-at "%="))
               (looking-at "%[QqrxWw]?\\([^a-zA-Z0-9 \t\n]\\)"))
          (goto-char (match-beginning 1))
          (setq expand (not (memq (char-before) '(?q ?w))))
          (setq w (match-string 1))
          (cond
           ((string= w "[") (setq re "]["))
           ((string= w "{") (setq re "}{"))
           ((string= w "(") (setq re ")("))
           ((string= w "<") (setq re "><"))
           ((and expand (string= w "\\"))
            (setq w (concat "\\" w))))
          (unless (cond (re (ruby-forward-string re end t expand))
                        (expand (ruby-forward-string w end t t))
                        (t (re-search-forward
                            (if (string= w "\\")
                                "\\\\[^\\]*\\\\"
                              (concat "[^\\]\\(\\\\\\\\\\)*" w))
                            end t)))
            (setq in-string (point))
            (goto-char end)))
         (t
          (goto-char pnt))))
       ((looking-at "\\?")              ;skip ?char
        (cond
         ((and (ruby-expr-beg)
               (looking-at "\\?\\(\\\\C-\\|\\\\M-\\)*\\\\?."))
          (goto-char (match-end 0)))
         (t
          (goto-char pnt))))
       ((looking-at "\\$")              ;skip $char
        (goto-char pnt)
        (forward-char 1))
       ((looking-at "#")                ;skip comment
        (forward-line 1)
        (goto-char (point))
        )
       ((looking-at "[\\[{(]")
        (setq nest (cons (cons (char-after (point)) pnt) nest))
        (setq depth (1+ depth))
        (goto-char pnt)
        )
       ((looking-at "[])}]")
        (setq depth (1- depth))
        (setq nest (cdr nest))
        (goto-char pnt))
       ((looking-at ruby-block-end-re)
        (if (or (and (not (bolp))
                     (progn
                       (forward-char -1)
                       (setq w (char-after (point)))
                       (or (eq ?_ w)
                           (eq ?. w))))
                (progn
                  (goto-char pnt)
                  (setq w (char-after (point)))
                  (or (eq ?_ w)
                      (eq ?! w)
                      (eq ?? w))))
            nil
          (setq nest (cdr nest))
          (setq depth (1- depth)))
        (goto-char pnt))
       ((looking-at "def\\s +[^(\n;]*")
        (if (or (bolp)
                (progn
                  (forward-char -1)
                  (not (eq ?_ (char-after (point))))))
            (progn
              (setq nest (cons (cons nil pnt) nest))
              (setq depth (1+ depth))))
        (goto-char (match-end 0)))
       ((looking-at (concat "\\_<\\(" ruby-block-beg-re "\\)\\_>"))
        (and
         (save-match-data
           (or (not (looking-at "do\\_>"))
               (save-excursion
                 (back-to-indentation)
                 (not (looking-at ruby-non-block-do-re)))))
         (or (bolp)
             (progn
               (forward-char -1)
               (setq w (char-after (point)))
               (not (or (eq ?_ w)
                        (eq ?. w)))))
         (goto-char pnt)
         (not (eq ?! (char-after (point))))
         (skip-chars-forward " \t")
         (goto-char (match-beginning 0))
         (or (not (looking-at ruby-modifier-re))
             (ruby-expr-beg 'modifier))
         (goto-char pnt)
         (setq nest (cons (cons nil pnt) nest))
         (setq depth (1+ depth)))
        (goto-char pnt))
       ((looking-at ":\\(['\"]\\)")
        (goto-char (match-beginning 1))
        (ruby-forward-string (match-string 1) end t))
       ((looking-at ":\\([-,.+*/%&|^~<>]=?\\|===?\\|<=>\\|![~=]?\\)")
        (goto-char (match-end 0)))
       ((looking-at ":\\([a-zA-Z_][a-zA-Z_0-9]*[!?=]?\\)?")
        (goto-char (match-end 0)))
       ((or (looking-at "\\.\\.\\.?")
            (looking-at "\\.[0-9]+")
            (looking-at "\\.[a-zA-Z_0-9]+")
            (looking-at "\\."))
        (goto-char (match-end 0)))
       ((looking-at "^=begin")
        (if (re-search-forward "^=end" end t)
            (forward-line 1)
          (setq in-string (match-end 0))
          (goto-char end)))
       ((looking-at "<<")
        (cond
         ((and (ruby-expr-beg 'heredoc)
               (looking-at "<<\\([-~]\\)?\\(\\([\"'`]\\)\\([^\n]+?\\)\\3\\|\\(?:\\sw\\|\\s_\\)+\\)"))
          (setq re (regexp-quote (or (match-string 4) (match-string 2))))
          (if (match-beginning 1) (setq re (concat "\\s *" re)))
          (let* ((id-end (goto-char (match-end 0)))
                 (line-end-position (point-at-eol))
                 (state (list in-string nest depth pcol indent)))
            ;; parse the rest of the line
            (while (and (> line-end-position (point))
                        (setq state (apply #'ruby-parse-partial
                                           line-end-position state))))
            (setq in-string (car state)
                  nest (nth 1 state)
                  depth (nth 2 state)
                  pcol (nth 3 state)
                  indent (nth 4 state))
            ;; skip heredoc section
            (if (re-search-forward (concat "^" re "$") end 'move)
                (forward-line 1)
              (setq in-string id-end)
              (goto-char end))))
         (t
          (goto-char pnt))))
       ((looking-at "^__END__$")
        (goto-char pnt))
       ((and (looking-at ruby-here-doc-beg-re)
	     (boundp 'ruby-indent-point))
        (if (re-search-forward (ruby-here-doc-end-match)
                               ruby-indent-point t)
            (forward-line 1)
          (setq in-string (match-end 0))
          (goto-char ruby-indent-point)))
       (t
        (error "Bad string %s" (buffer-substring (point) pnt))))))
  (list in-string nest depth pcol))