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;; geiser-syntax.el -- guile-specific scheme syntax
;; Copyright (C) 2009 Jose Antonio Ortega Ruiz
;; Author: Jose Antonio Ortega Ruiz <jao@gnu.org>
;; Start date: Sun Feb 08, 2009 15:03
;; This file is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 3 of the License, or
;; (at your option) any later version.
;; This file 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 General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with this program. If not, see <http://www.gnu.org/licenses/>.
;;; Comentary:
;; Utilities for parsing Guile-specific Scheme syntax.
;;; Code:
(require 'geiser-popup)
(require 'geiser-base)
(require 'scheme)
;;; Modules:
(defconst geiser-syntax--module-definition-re
"(define-module +\\(([^)]+)\\)")
(defun geiser-syntax--buffer-module (&optional buffer)
(let ((buffer (or buffer (current-buffer))))
(with-current-buffer buffer
(save-excursion
(goto-char (point-min))
(when (re-search-forward geiser-syntax--module-definition-re nil t)
(car (read-from-string (match-string-no-properties 1))))))))
;;; Indentation:
(defun geiser-syntax--setup-scheme-indent ()
(let ((defuns '(catch)))
(mapc (lambda (d) (put d 'scheme-indent-function 'defun)) defuns)))
(geiser-syntax--setup-scheme-indent)
;;; Code parsing:
(geiser-popup--define syntax " *geiser syntax analyst*" scheme-mode)
(defun geiser-syntax--prepare-scheme-for-elisp-reader ()
(goto-char (point-min))
(while (re-search-forward "#\<\\([^>]*?\\)\>" nil t)
(let ((from (match-beginning 1))
(to (match-end 1)))
(goto-char from)
(while (re-search-forward "\\([() ;'`]\\)" to t)
(replace-match "\\\\\\1"))
(goto-char to)))
(goto-char (point-min))
(while (re-search-forward "#(" nil t) (replace-match "(vector "))
(goto-char (point-min))
(while (re-search-forward "#" nil t) (replace-match "\\\\#"))
(goto-char (point-min))
(skip-syntax-forward "^("))
(defsubst geiser-syntax--del-sexp (arg)
(let ((p (point)))
(forward-sexp arg)
(delete-region p (point))))
(defconst geiser-syntax--placeholder (format "___%s___" (random 100)))
(defun geiser-syntax--complete-partial-sexp (buffer begin end)
(geiser-syntax--with-buffer
(erase-buffer)
(insert-buffer-substring-no-properties buffer begin end)
(when (not (eq (char-after (point)) ?\())
(skip-syntax-backward "-<>")
(delete-region (point) (point-max)))
(let ((p (nth 8 (syntax-ppss))))
(when p ;; inside a comment or string
(let ((str (nth 3 (syntax-ppss))))
(delete-region p (point-max))
(when str (insert geiser-syntax--placeholder)))))
(when (cond ((eq (char-after (1- (point))) ?\)) (geiser-syntax--del-sexp -1) t)
((eq (char-after (point)) ?\() (delete-region (point) (point-max)) t)
((memq (char-after (1- (point))) (list ?. ?@ ?, ?\' ?\` ?\# ?\\))
(skip-syntax-backward "^-(")
(delete-region (point) (point-max))
t))
(insert geiser-syntax--placeholder))
(save-excursion
(goto-char (point-min))
(while (re-search-forward "[.@,'`#\\\\]" nil t)
(replace-match "" nil nil))
(goto-char (point-min))
(while (re-search-forward "\\[" nil t)
(replace-match "(" nil nil))
(goto-char (point-min))
(while (re-search-forward "\\]" nil t)
(replace-match ")" nil nil)))
(let ((depth (nth 0 (parse-partial-sexp (point-min) (point)))))
(unless (zerop depth) (insert (make-string depth ?\)))))
(when (< (point-min) (point)) (buffer-substring (point-min) (point)))))
(defsubst geiser-syntax--get-partial-sexp ()
(unless (zerop (nth 0 (syntax-ppss)))
(let* ((end (if (eq (char-after (point)) ?\() (1+ (point))
(save-excursion (skip-syntax-forward "^-\"<>()") (point))))
(begin (save-excursion (beginning-of-defun) (point))))
(geiser-syntax--complete-partial-sexp (current-buffer) begin end))))
;;; Fontify strings as Scheme code:
(defun geiser-syntax--font-lock-buffer ()
(let ((name " *geiser font lock*"))
(or (get-buffer name)
(let ((buffer (get-buffer-create name)))
(set-buffer buffer)
(scheme-mode)
buffer))))
(defun geiser-syntax--scheme-str (str)
(save-current-buffer
(set-buffer (geiser-syntax--font-lock-buffer))
(erase-buffer)
(insert str)
(let ((font-lock-verbose nil)) (font-lock-fontify-buffer))
(buffer-string)))
(provide 'geiser-syntax)
;;; geiser-syntax.el ends here
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