0.7.13.24:
[sbcl/simd.git] / src / code / parse-body.lisp
blob8a1ed022f5f4110cfa96f0b9e0de6966babd502a
1 ;;;; functions used to parse function/macro bodies
2 ;;;;
3 ;;;; FIXME: In an early attempt to bootstrap SBCL, this file
4 ;;;; was loaded before fundamental things like DEFUN and AND and OR
5 ;;;; were defined, and it still bears scars from the attempt to
6 ;;;; make that work. (TAGBODY, forsooth..) It should be cleaned up.
8 ;;;; This software is part of the SBCL system. See the README file for
9 ;;;; more information.
10 ;;;;
11 ;;;; This software is derived from the CMU CL system, which was
12 ;;;; written at Carnegie Mellon University and released into the
13 ;;;; public domain. The software is in the public domain and is
14 ;;;; provided with absolutely no warranty. See the COPYING and CREDITS
15 ;;;; files for more information.
17 (in-package "SB!INT")
19 (/show0 "entering parse-body.lisp")
21 ;;; Given a sequence of declarations (and possibly a documentation
22 ;;; string) followed by other forms (as occurs in the bodies of DEFUN,
23 ;;; DEFMACRO, etc.) return (VALUES FORMS DECLS DOC), where DECLS holds
24 ;;; declarations, DOC holds a doc string (or NIL if none), and FORMS
25 ;;; holds the other forms.
26 ;;;
27 ;;; If DOC-STRING-ALLOWED is NIL, then no forms will be treated as
28 ;;; documentation strings.
29 (defun parse-body (body &optional (doc-string-allowed t))
30 (let ((reversed-decls nil)
31 (forms body)
32 (doc nil))
33 ;; Since we don't have macros like AND, OR, and NOT yet, it's
34 ;; hard to express these tests clearly. Giving them names
35 ;; seems to help a little bit.
36 (flet ((doc-string-p (x remaining-forms)
37 (if (stringp x)
38 (if doc-string-allowed
39 ;; ANSI 3.4.11 explicitly requires that a doc
40 ;; string be followed by another form (either an
41 ;; ordinary form or a declaration). Hence:
42 (if remaining-forms
43 (if doc
44 ;; ANSI 3.4.11 says that the consequences of
45 ;; duplicate doc strings are unspecified.
46 ;; That's probably not something the
47 ;; programmer intends. We raise an error so
48 ;; that this won't pass unnoticed.
49 (error "duplicate doc string ~S" x)
50 t)))))
51 (declaration-p (x)
52 (if (consp x)
53 (eq (car x) 'declare))))
54 (tagbody
55 :again
56 (if forms
57 (let ((form1 (first forms)))
58 ;; Note: The (IF (IF ..) ..) stuff is because we don't
59 ;; have the macro AND yet.:-|
60 (if (doc-string-p form1 (rest forms))
61 (setq doc form1)
62 (if (declaration-p form1)
63 (setq reversed-decls
64 (cons form1 reversed-decls))
65 (go :done)))
66 (setq forms (rest forms))
67 (go :again)))
68 :done)
69 (values forms
70 (nreverse reversed-decls)
71 doc))))
73 (/show0 "leaving parse-body.lisp")