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140 lines
5.7 KiB
140 lines
5.7 KiB
(in-package :swank)
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(defvar *application-hints-tables* '()
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"A list of hash tables mapping symbols to indentation hints (lists
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of symbols and numbers as per cl-indent.el). Applications can add hash
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tables to the list to change the auto indentation slime sends to
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emacs.")
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(defun has-application-indentation-hint-p (symbol)
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(let ((default (load-time-value (gensym))))
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(dolist (table *application-hints-tables*)
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(let ((indentation (gethash symbol table default)))
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(unless (eq default indentation)
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(return-from has-application-indentation-hint-p
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(values indentation t))))))
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(values nil nil))
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(defun application-indentation-hint (symbol)
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(let ((indentation (has-application-indentation-hint-p symbol)))
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(labels ((walk (indentation-spec)
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(etypecase indentation-spec
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(null nil)
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(number indentation-spec)
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(symbol (string-downcase indentation-spec))
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(cons (cons (walk (car indentation-spec))
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(walk (cdr indentation-spec)))))))
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(walk indentation))))
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;;; override swank version of this function
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(defun symbol-indentation (symbol)
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"Return a form describing the indentation of SYMBOL.
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The form is to be used as the `common-lisp-indent-function' property
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in Emacs."
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(cond
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((has-application-indentation-hint-p symbol)
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(application-indentation-hint symbol))
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((and (macro-function symbol)
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(not (known-to-emacs-p symbol)))
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(let ((arglist (arglist symbol)))
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(etypecase arglist
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((member :not-available)
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nil)
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(list
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(macro-indentation arglist)))))
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(t nil)))
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;;; More complex version.
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(defun macro-indentation (arglist)
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(labels ((frob (list &optional base)
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(if (every (lambda (x)
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(member x '(nil "&rest") :test #'equal))
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list)
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;; If there was nothing interesting, don't return anything.
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nil
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;; Otherwise substitute leading NIL's with 4 or 1.
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(let ((ok t))
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(substitute-if (if base
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4
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1)
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(lambda (x)
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(if (and ok (not x))
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t
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(setf ok nil)))
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list))))
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(walk (list level &optional firstp)
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(when (consp list)
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(let ((head (car list)))
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(if (consp head)
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(let ((indent (frob (walk head (+ level 1) t))))
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(cons (list* "&whole" (if (zerop level)
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4
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1)
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indent) (walk (cdr list) level)))
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(case head
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;; &BODY is &BODY, this is clear.
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(&body
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'("&body"))
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;; &KEY is tricksy. If it's at the base level, we want
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;; to indent them normally:
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;;
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;; (foo bar quux
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;; :quux t
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;; :zot nil)
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;;
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;; If it's at a destructuring level, we want indent of 1:
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;;
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;; (with-foo (var arg
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;; :foo t
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;; :quux nil)
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;; ...)
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(&key
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(if (zerop level)
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'("&rest" nil)
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'("&rest" 1)))
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;; &REST is tricksy. If it's at the front of
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;; destructuring, we want to indent by 1, otherwise
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;; normally:
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;;
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;; (foo (bar quux
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;; zot)
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;; ...)
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;;
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;; but
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;;
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;; (foo bar quux
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;; zot)
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(&rest
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(if (and (plusp level) firstp)
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'("&rest" 1)
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'("&rest" nil)))
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;; &WHOLE and &ENVIRONMENT are skipped as if they weren't there
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;; at all.
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((&whole &environment)
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(walk (cddr list) level firstp))
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;; &OPTIONAL is indented normally -- and the &OPTIONAL marker
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;; itself is not counted.
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(&optional
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(walk (cdr list) level))
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;; Indent normally, walk the tail -- but
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;; unknown lambda-list keywords terminate the walk.
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(otherwise
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(unless (member head lambda-list-keywords)
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(cons nil (walk (cdr list) level))))))))))
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(frob (walk arglist 0 t) t)))
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#+nil
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(progn
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(assert (equal '(4 4 ("&whole" 4 "&rest" 1) "&body")
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(macro-indentation '(bar quux (&rest slots) &body body))))
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(assert (equal nil
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(macro-indentation '(a b c &rest more))))
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(assert (equal '(4 4 4 "&body")
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(macro-indentation '(a b c &body more))))
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(assert (equal '(("&whole" 4 1 1 "&rest" 1) "&body")
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(macro-indentation '((name zot &key foo bar) &body body))))
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(assert (equal nil
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(macro-indentation '(x y &key z)))))
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(provide :swank-indentation)
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