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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))
;;; A simple scheme reader
(defvar geiser-syntax--read/buffer-limit nil)
(defsubst geiser-syntax--read/eos ()
(or (eobp)
(and (numberp geiser-syntax--read/buffer-limit)
(<= geiser-syntax--read/buffer-limit (point)))))
(defsubst geiser-syntax--read/next-char ()
(unless (geiser-syntax--read/eos)
(forward-char)
(char-after)))
(defsubst geiser-syntax--read/token (token)
(geiser-syntax--read/next-char)
(if (listp token) token (list token)))
(defsubst geiser-syntax--read/elisp ()
(ignore-errors (read (current-buffer))))
(defun geiser-syntax--read/next-token ()
(skip-syntax-forward "->")
(if (geiser-syntax--read/eos) '(eob)
(let ((c (char-after)))
(cond ((not c) '(eob))
((eq c '\;)
(skip-syntax-forward "^>")
(geiser-syntax--read/next-token))
((memq c '(?\( ?\[)) (geiser-syntax--read/token 'lparen))
((memq c '(?\) ?\])) (geiser-syntax--read/token 'rparen))
((eq c ?.)
(if (memq (syntax-after (1+ (point))) '(0 11 12))
(geiser-syntax--read/token 'dot)
(cons 'atom (geiser-syntax--read/elisp))))
((eq c ?\#)
(let ((c (geiser-syntax--read/next-char)))
(cond ((not c) '(eob))
((eq c ?\\) (cons 'char (geiser-syntax--read/elisp)))
((eq c ?\() (geiser-syntax--read/token 'vectorb))
(t (geiser-syntax--read/next-token)))))
((eq c ?\') (geiser-syntax--read/token '(quote . quote)))
((eq c ?\`) (geiser-syntax--read/token
`(backquote . ,backquote-backquote-symbol)))
((eq c ?,) (if (eq (geiser-syntax--read/next-char) ?@)
(geiser-syntax--read/token
`(splice . ,backquote-splice-symbol))
`(unquote . ,backquote-unquote-symbol)))
((eq c ?\") (cons 'string (geiser-syntax--read/elisp)))
(t (cons 'atom (geiser-syntax--read/elisp)))))))
(defsubst geiser-syntax--read/match (&rest tks)
(let ((token (geiser-syntax--read/next-token)))
(if (memq (car token) tks) token
(error "Unexpected token: %s" token))))
(defsubst geiser-syntax--read/try (&rest tks)
(let ((p (point))
(tk (ignore-errors (apply 'geiser-syntax--read/match tks))))
(unless tk (goto-char p))
tk))
(defun geiser-syntax--read/list ()
(cond ((geiser-syntax--read/try 'dot)
(let ((tail (geiser-syntax--read)))
(geiser-syntax--read/match 'eob 'rparen)
tail))
((geiser-syntax--read/try 'rparen 'eob) nil)
(t (cons (geiser-syntax--read)
(geiser-syntax--read/list)))))
(defun geiser-syntax--read ()
(let ((token (geiser-syntax--read/next-token)))
(case (car token)
(eob nil)
(lparen (geiser-syntax--read/list))
(vectorb (apply 'vector (geiser-syntax--read/list)))
((quote backquote unquote splice) (list (cdr token) (geiser-syntax--read)))
((char string atom) (cdr token))
(t (error "Reading scheme syntax: unexpected token: %s" token)))))
;;; Code parsing:
(defsubst geiser-syntax--skip-comment/string ()
(goto-char (or (nth 8 (syntax-ppss)) (point))))
(defsubst geiser-syntax--nesting-level ()
(or (nth 0 (syntax-ppss)) 0))
(defun geiser-syntax--scan-sexps ()
(save-excursion
(let* ((fst (symbol-at-point))
(path (and fst (list (list fst 0)))))
(while (not (zerop (geiser-syntax--nesting-level)))
(let ((geiser-syntax--read/buffer-limit (1+ (point))))
(backward-up-list)
(let ((form (save-excursion (geiser-syntax--read))))
(when (and (listp form) (car form) (symbolp (car form)))
(let* ((len-1 (1- (length form)))
(prev (and (> len-1 1) (nth (1- len-1) form))))
(push `(,(car form) ,len-1 ,@(and prev (symbolp prev) (list prev)))
path))))))
(nreverse path))))
(defun geiser-syntax--locals-around-point ()
(when (eq major-mode 'scheme-mode)
(save-excursion
(geiser-syntax--skip-comment/string)
(let* ((ids)
(push-id (lambda (n) (when (symbolp n) (push n ids))))
(get-arg (lambda (n) (if (listp n) (car n) n)))
(push-ids (lambda (is) (mapc push-id (nreverse (mapcar get-arg is))))))
(while (not (zerop (geiser-syntax--nesting-level)))
(let ((geiser-syntax--read/buffer-limit (point)))
(backward-up-list)
(let* ((form (save-excursion (geiser-syntax--read)))
(head (and (listp form) (car form)))
(snd (and head (cadr form)))
(third (and head (caddr form)))
(is (case head
((define define*) (if (listp snd) snd (list snd)))
((let* letrec lambda let)
(if (listp snd) snd
(cons snd (and (eq head 'let)
(listp third)
third))))))
(body (and is (case head
((define define*) (and (listp snd) (cddr form)))
((let let* letrec lambda)
(if (listp snd) (cddr form)
(cdddr form)))))))
(when is
(funcall push-ids
(mapcar 'cdr
(remove-if (lambda (f) (or (not (listp f))
(not (eq (car f) 'define))))
body)))
(funcall push-ids is)))))
(nreverse ids)))))
;;; Fontify strings as Scheme code:
(geiser-popup--define syntax " *geiser syntax analyst*" scheme-mode)
(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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