feat: pluck-deep handles missing properties

line-o · Mar 19, 2021 · 2ec8681 · 2ec8681
1 parent be571a8
commit 2ec8681
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Showing 2 changed files with 13 additions and 14 deletions.
diff --git a/src/content/xbow.xqm b/src/content/xbow.xqm
@@ -217,7 +217,11 @@ function xbow:pluck-deep ($fields as xs:anyAtomicType*) as item()* {
 
 declare
 function xbow:pluck-deep ($map-or-array-or-node as item(), $fields as xs:anyAtomicType*) as item()* {
-    fold-left($fields, $map-or-array-or-node, xbow:pluck#2)
+    fold-left($fields, $map-or-array-or-node, function ($eventual-item as item()*, $field) {
+        if (exists($eventual-item))
+        then (xbow:pluck($eventual-item, $field))
+        else ()
+    })
 };
 
 (: stats :)

diff --git a/src/test/xbow-spec.xqm b/src/test/xbow-spec.xqm
@@ -210,22 +210,17 @@ function xbow-spec:array-group-by-even-odd-accessor () {
 declare 
     %test:assertEquals(1)
 function xbow-spec:pluck-deep () {
-    map { 
-        'a': map { 
-            'b': map { 
-                'c': map { 
-                    'd': map { 
-                        'e': map { 
-                            'f': 1 
-                        }
-                    }
-                }
-            }
-        }
-    }
+    map {'a': map {'b': map {'c': map {'d': map {'e': map {'f': 1 }}}}}}
         => xbow:pluck-deep(('a','b','c','d','e','f'))
 };
 
+declare 
+    %test:assertEmpty
+function xbow-spec:pluck-deep-non-existent-field () {
+    map {'a': map {'b': map {'c': map {'d': map {'e': map {'f': 1 }}}}}}
+        => xbow:pluck-deep(('a','b','c', 1, 'd','e','f'))
+};
+
 
 declare 
     %test:assertEquals(9)