X-Git-Url: https://git.jsancho.org/?p=bongodb.git;a=blobdiff_plain;f=src%2Fbongodb.scm;h=24ced3684c04aba6302c46a7818b7893f1bbd3e5;hp=e4df14bde9e1699503e91b4b9d6b9883446ba0b1;hb=ad684286a189372fef4946c4fc2d78c75685bd19;hpb=0fe9f925e00b6899f3b685082ed9b3374933c527

diff --git a/src/bongodb.scm b/src/bongodb.scm
index e4df14b..24ced36 100644
--- a/src/bongodb.scm
+++ b/src/bongodb.scm
@@ -16,15 +16,20 @@
 
 
 (define-module (bongodb)
-  #:use-module (ice-9 receive)
-  #:use-module (ice-9 vlist)
   #:use-module (srfi srfi-9)
   #:use-module (srfi srfi-9 gnu)
+  #:use-module (srfi srfi-69)
   #:export (make-collection
 	    collection?
 	    count
 	    insert
-	    find))
+	    find
+	    update
+	    $eq
+	    $exists
+	    $not
+	    $and
+	    $set))
 
 
 ;;; Collection Definition
@@ -35,10 +40,10 @@
   (table get-table))
 
 (define (make-collection)
-  (make-collection-record vlist-null))
+  (make-collection-record (make-hash-table)))
 
 (define (count col)
-  (vlist-length (get-table col)))
+  (hash-table-size (get-table col)))
 
 (set-record-type-printer! collection
   (lambda (record port)
@@ -50,57 +55,87 @@
 ;;; Working with documents
 
 (define (format-document document)
-  "Return a vhash document ready to store in a collection"
+  "Return an alist document ready to store in a collection"
   (document-with-id
-   (cond ((vhash? document)
-	  document)
+   (cond ((hash-table? document)
+	  (hash-table->alist document))
 	 (else
-	  (alist->vhash document)))))
+	  document))))
 
 (define (document-with-id document)
   "Return always a document with an id"
-  (or (and (vhash-assoc '_id document)
+  (or (and (assoc '_id document)
 	   document)
-      (vhash-cons '_id (gensym) document)))
+      (assoc-set! document '_id (gensym))))
 
 (define (insert col . documents)
-  "Insert documents into the collection and return the new collection"
+  "Insert documents into the collection and return document ids"
   (cond ((null? documents)
-	 (values col '()))
+	 '())
 	(else
 	 (let* ((document (format-document (car documents)))
-		(docid (cdr (vhash-assoc '_id document)))
-		(newcol (make-collection-record (vhash-cons docid document (get-table col)))))
-	   (receive (rescol docids)
-	       (apply insert (cons newcol (cdr documents)))
-	     (values rescol (cons docid docids)))))))
+		(docid (assoc-ref document '_id)))
+	   (hash-table-set! (get-table col) docid document)
+	   (cons docid (apply insert (cons col (cdr documents))))))))
 
 (define (find col filter)
   "Query the collection and return the documents that match with filter"
-  (let ((table (get-table col)))
-    (vhash-fold
-     (lambda (key document result)
-       (cond ((match-document? document filter)
-	      (cons (vhash->alist document) result))
-	     (else
-	      result)))
-     '()
-     table)))
+  (hash-table-fold
+   (get-table col)
+   (lambda (key document result)
+     (cond ((match-document? document filter)
+	    (cons document result))
+	   (else
+	    result)))
+   '()))
 
 (define (match-document? document filter)
-  "Try to match the given document with a list of conditions"
-  (cond ((null? filter)
+  "Try to match the given document with a given filter"
+  (cond ((equal? filter #t)
 	 #t)
 	(else
-	 (and
-	  (equal? (vhash-assoc (caar filter) document) (car filter))
-	  (match-document? document (cdr filter))))))
+	 (filter document))))
 
+(define (update col filter . changes)
+  "Update selected documents using the given filter"
+  (let ((documents (find col filter)))
+    (apply insert (cons col (map (lambda (doc) (update-document doc changes)) documents)))))
 
-;;; Tools
+(define (update-document document changes)
+  "Update a document with the appropiate changes"
+  (cond ((null? changes)
+	 document)
+	(else
+	 (update-document ((car changes) document) (cdr changes)))))
+
+
+;;; Queries
+
+(define ($eq field value)
+  (lambda (document)
+    (let ((stored (assoc field document)))
+      (and stored
+	   (equal? (cdr stored) value)))))
+
+(define ($exists field)
+  (lambda (document)
+    (and (assoc field document)
+	 #t)))
+
+(define ($not expr)
+  (lambda (document)
+    (not (expr document))))
+
+(define-syntax $and
+  (syntax-rules ()
+    ((_ expr ...)
+     (lambda (document)
+       (and (expr document)
+	    ...)))))
+
+
+;;; Updates
 
-(define (vhash->alist vhash)
-  (vhash-fold-right
-   (lambda (key value result) (assoc-set! result key value))
-   '()
-   vhash))
+(define ($set field value)
+  (lambda (document)
+    (assoc-set! document field value)))