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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-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--complete-partial-sexp (buffer begin end)
(set-buffer buffer)
(let ((inhibit-read-only t))
(copy-to-buffer (geiser-syntax--buffer) begin end))
(geiser-syntax--with-buffer
(goto-char (point-max))
(skip-syntax-backward "-")
(let ((pps (parse-partial-sexp (point-min) (point))))
(cond ((nth 8 pps) ;; inside a comment or string
(delete-region (nth 8 pps) (point-max)))
((nth 5 pps) (delete-char -1))) ;; after a quote
(let ((depth (nth 0 pps)))
(unless (zerop depth) (insert (make-string depth ?\)))))
(geiser-syntax--prepare-scheme-for-elisp-reader)
(read (current-buffer)))))
(defsubst geiser-syntax--get-partial-sexp ()
(save-excursion
(let* ((begin (point))
(end (progn (beginning-of-defun) (point))))
(geiser-syntax--complete-partial-sexp (current-buffer) begin end))))
(defun geiser-syntax--collect-local-symbols (sexp acc)
(cond ((or (null sexp) (not (listp sexp))) acc)
((listp (car sexp))
(geiser-syntax--collect-local-symbols
(cdr sexp)
(geiser-syntax--collect-local-symbols (car sexp) acc)))
((memq (car sexp) '(define define*))
(let* ((name (cadr sexp))
(name (if (symbolp name) name (car name)))
(acc (if (symbolp name) (cons name acc) acc)))
(geiser-syntax--collect-local-symbols (cddr sexp) acc)))
((memq (car sexp) '(let let* letrec))
(let* ((n (if (listp (nth 1 sexp)) 1 2))
(syms (mapcar 'car (nth n sexp)))
(rest (if (= 1 n) (cddr sexp) (cdr (cddr sexp)))))
(geiser-syntax--collect-local-symbols rest (append syms acc))))
(t (geiser-syntax--collect-local-symbols (cdr sexp) acc))))
(defsubst geiser-syntax--local-bindings ()
(ignore-errors
(mapcar 'symbol-name
(geiser-syntax--collect-local-symbols (geiser-syntax--get-partial-sexp) '()))))
(defsubst geiser-syntax--end-of-thing ()
(let ((sc (or (syntax-class (syntax-after (point))) 0)))
(when (= sc 7) (forward-char))
(cond ((nth 3 (syntax-ppss))
(skip-syntax-forward "^\"")
(forward-char))
((and (= sc 5) (eq ?\( (char-before))) (forward-char))
((not (or (= sc 0) (= sc 12))) ;; comment, whitespace
(ignore-errors (forward-sexp))))
(point)))
(defun geiser-syntax--enclosing-form-data ()
(save-excursion
(let* ((p (geiser-syntax--end-of-thing))
(current (cons (symbol-at-point) 0))
(data))
(ignore-errors
(while (not (bobp))
(backward-up-list)
(save-excursion
(forward-char)
(let ((proc (symbol-at-point))
(arg-no 0))
(when proc
(while (< (point) p)
(forward-sexp)
(when (< (point) p) (setq arg-no (1+ arg-no))))
(push (cons proc arg-no) data))))))
(reverse (if (car current) (push current data) data)))))
(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 "^("))
;;; 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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