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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)
;;; Indentation:
(defmacro geiser-syntax--scheme-indent (&rest pairs)
`(progn ,@(mapcar (lambda (p)
`(put ',(car p) 'scheme-indent-function ',(cadr p)))
pairs)))
(geiser-syntax--scheme-indent
(begin0 1)
(c-declare 0)
(c-lambda 2)
(case-lambda 0)
(catch defun)
(class defun)
(class* defun)
(compound-unit/sig 0)
(dynamic-wind 0)
(for/fold 2)
(instantiate 2)
(interface 1)
(lambda/kw 1)
(let*-values 1)
(let+ 1)
(let-values 1)
(let/ec 1)
(match defun)
(mixin 2)
(module defun)
(opt-lambda 1)
(parameterize 1)
(parameterize-break 1)
(parameterize* 1)
(pmatch defun)
(quasisyntax/loc 1)
(receive 2)
(send* 1)
(sigaction 1)
(syntax-case 2)
(syntax/loc 1)
(type-case defun)
(unit defun)
(unit/sig 2)
(unless 1)
(when 1)
(while 1)
(with-handlers 1)
(with-method 1)
(with-syntax 1))
;;; Code parsing:
(geiser-popup--define syntax " *geiser syntax analyst*" scheme-mode)
(defsubst geiser-syntax--del-sexp (arg)
(let ((p (point)))
(forward-sexp arg)
(delete-region p (point))))
(defconst geiser-syntax--placeholder (format "___%s___" (random 100)))
(defsubst geiser-syntax--beginning-of-form ()
(memq (char-after (point)) '(?\" ?\()))
(defun geiser-syntax--scan-sexp ()
(let ((p (point))
(n -1)
prev head)
(ignore-errors
(backward-up-list)
(save-excursion
(forward-char)
(skip-syntax-forward "^_w(" p)
(when (setq head (symbol-at-point))
(while (< (point) p)
(setq n (1+ n))
(setq prev (symbol-at-point))
(forward-sexp))))
(if head (list head n (and (> n 1) prev)) 'skip))))
(defun geiser-syntax--scan-sexps ()
(save-excursion
(goto-char (or (nth 8 (syntax-ppss)) (point)))
(let* ((sap (symbol-at-point))
(fst (and sap (geiser-syntax--scan-sexp)))
(path (and fst
(cond ((not (listp fst)) `((,sap 0)))
((eq sap (car fst)) (list fst))
(t (list fst (list sap 0)))))))
(while (setq fst (geiser-syntax--scan-sexp))
(when (listp fst) (push fst path)))
(nreverse path))))
(defun geiser-syntax--complete-partial-sexp (buffer begin end)
(geiser-syntax--with-buffer
(erase-buffer)
(insert-buffer-substring-no-properties buffer begin end)
(when (not (geiser-syntax--beginning-of-form))
(skip-syntax-backward "-<>")
(delete-region (point) (point-max)))
(let ((p (nth 8 (syntax-ppss))))
(when p ;; inside a comment or string
(delete-region p (point-max))
(insert geiser-syntax--placeholder)))
(when (cond ((eq (char-after (1- (point))) ?\))
(geiser-syntax--del-sexp -1) t)
((geiser-syntax--beginning-of-form)
(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 (geiser-syntax--beginning-of-form) (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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