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-rw-r--r--dbsyn.scm68
1 files changed, 57 insertions, 11 deletions
diff --git a/dbsyn.scm b/dbsyn.scm
index 1bc1319..f807642 100644
--- a/dbsyn.scm
+++ b/dbsyn.scm
@@ -1,5 +1,7 @@
-;;;; "dbsyn.scm" -- Syntactic extensions for RDMS (within-database)
-;;; Copyright (C) 2002 Ivan Shmakov <ivan@theory.dcn-asu.ru>
+;;; "dbsyn.scm" -- Syntactic extensions for RDMS -*- scheme -*-
+;; Features: within-database
+
+;;; Copyright (C) 2002, 2003 Ivan Shmakov <ivan@theory.dcn-asu.ru>
;;
;; Permission to copy this software, to modify it, to redistribute it,
;; to distribute modified versions, and to use it for any purpose is
@@ -31,24 +33,68 @@
;; ... and get TAGS table with all of my database commands and tables.
-(require 'relational-database)
+;;; Code:
(require 'database-commands)
(require 'databases)
+(require 'relational-database)
+
;@
(define-syntax within-database
- (syntax-rules (define-table define-command)
-
+ (syntax-rules (define-table define-command define-macro)
+ ;
((within-database database)
database)
-
+ ; define-table
((within-database database
- (define-table (name primary columns) row ...)
- rest ...)
+ (define-table (name primary columns) row ...)
+ rest ...)
(begin (define-tables database '(name primary columns (row ...)))
(within-database database rest ...)))
-
+ ; define-command
((within-database database
- (define-command template arg-1 arg-2 ...)
- rest ...)
+ (define-command template arg-1 arg-2 ...)
+ rest ...)
(begin (define-*commands* database '(template arg-1 arg-2 ...))
+ (within-database database rest ...)))
+ ;
+ ((within-database database
+ (command arg-1 ...)
+ rest ...)
+ (begin (cond ((let ((p (database '*macro*)))
+ (and p (slib:eval (p 'command))))
+ => (lambda (proc)
+ (slib:eval
+ (apply proc database '(arg-1 ...)))))
+ (else
+ ((database 'command) arg-1 ...)))
(within-database database rest ...)))))
+
+(define (define-*macros* rdb . specs)
+ (define defmac
+ (((rdb 'open-table) '*macros* #t) 'row:update))
+ (for-each (lambda (spec)
+ (let* ((procname (caar spec))
+ (args (cdar spec))
+ (body-1 (cdr spec))
+ (comment (and (string? (car body-1))
+ (car body-1)))
+ (body (if comment (cdr body-1) body-1)))
+ (defmac (list procname
+ `(lambda ,args . ,body)
+ (or comment "")))))
+ specs))
+
+;@
+(define (add-macro-support rdb)
+ (define-tables rdb
+ '(*macros*
+ ((name symbol))
+ ((procedure expression)
+ (documentation string))
+ ((define-macro (lambda (db . args)
+ (define-*macros* db args)
+ #t) ""))))
+ (define-*commands* rdb
+ '((*macro* rdb)
+ (((rdb 'open-table) '*macros* #f) 'get 'procedure)))
+ rdb)