97 lines
3.1 KiB
Common Lisp
97 lines
3.1 KiB
Common Lisp
;; objective-lisp: Object-oriented syntactic sugar for Lisp
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;; ~keith
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(defpackage objective-lisp
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(:use common-lisp)
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(:export +open-construct-char+ +close-construct-char+ +method-char+
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read-construct-contents
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destructure-construct
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read-method-name
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read-open-construct
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read-unexpected))
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(in-package objective-lisp)
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(defparameter +open-construct-char+ #\[)
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(defparameter +close-construct-char+ #\])
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(defparameter +method-char+ #\.)
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;; DONE
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;; (setf (slot-value object 'slot) value)
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;; => (setf [object slot] value)
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;; DONE
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;; (setf (slot-value (slot-value object 'slot-a) 'slot-b) value)
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;; => (setf [object slot-a slot-b] value)
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;; TODO
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;; (object-method object args...)
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;; => [object (.method args...)]
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(defun read-construct-contents (stream end-char)
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"Read the contents of an objective-lisp construct."
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(loop until (char= (peek-char t stream t nil t) end-char)
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collect (read stream t nil t)
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; Skip over end-char
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finally (read-char stream t nil t)))
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(defun quote-if-symbol (x)
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"Quote x if it's a symbol, return it verbatim otherwise."
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(if (symbolp x) `(quote ,x) x))
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(defun method-call-p (x)
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"Check if x is a sexpr of the form (.method args...)"
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(and (consp x) (consp (car x)) (eq (caar x) :method-call)))
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(defun consless-method-call-p (x)
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"Check if x is of the form .method (no arguments)"
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(and (consp x) (eq (car x) :method-call)))
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(defun destructure-construct (construct)
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"Recursively destructure an objective-lisp construct."
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(cond
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; Nothing left to destructure, return car
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((not (cdr construct))
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(car construct))
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; Method call [object (.method args...)]
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; => [object ((:method-call . method) args...)]
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((method-call-p (cadr construct))
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(let ((method-call (cadr construct)))
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(destructure-construct
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(cons `(,(cdar method-call) ,(car construct) ,@(cdr method-call))
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(cddr construct)))
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))
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; Consless method call [object .method]
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; => [object (:method-call . method)]
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((consless-method-call-p (cadr construct))
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(destructure-construct
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(cons `(,(cdadr construct) ,(car construct))
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(cddr construct)))
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)
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; Slot access [object slot]
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(t
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(destructure-construct
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(cons `(slot-value ,(car construct) ,(quote-if-symbol (cadr construct)))
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(cddr construct)))
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)))
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(defun read-method-name (stream char)
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"Read an objective-lisp method name."
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(declare (ignore char))
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(cons :method-call (read stream t nil t)))
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(defun read-open-construct (stream char)
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"Read an objective-lisp construct."
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(declare (ignore char))
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(let ((*readtable* (copy-readtable)))
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(set-macro-character +method-char+ 'read-method-name
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t) ; non-terminating so (12.34) doesn't become (12 (:method-call . 34))
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(destructure-construct (read-construct-contents stream +close-construct-char+))))
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(defun read-unexpected (stream char)
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(declare (ignore stream))
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(error "Unexpected character ~S" char))
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(set-macro-character +open-construct-char+ 'read-open-construct)
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(set-macro-character +close-construct-char+ 'read-unexpected)
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