More tests

Author: glyn

README.md

@@ -1,3 +1,5 @@
 # JSON Path Reference Implementation
 
+**WORK IN PROGRESS**
+
 See [cts.yaml](tests/cts.yaml) for the Compliance Test Suite and [grammar.pest](src/grammar.pest) for the Parsing Expression Grammar of the Reference Implementation.

src/matchers.rs

@@ -44,7 +44,12 @@ pub fn new_dot_child_matcher(name: String) -> DotChild {
 impl Matcher for DotChild {
     fn select<'a>(&self, node: &'a Value) -> Box<dyn Iterator<Item = &'a Value> + 'a> {
         if node.is_object() {
-            Box::new(iter::once(&node.as_object().unwrap()[&self.name]))
+            let mapping = node.as_object().unwrap();
+            if mapping.contains_key(&self.name) {
+                Box::new(iter::once(&mapping[&self.name]))
+            } else {
+                Box::new(iter::empty())
+            }
         } else {
             Box::new(iter::empty())
         }

tests/cts.yaml

@@ -7,7 +7,23 @@ tests:
       selector: "$.a"
       document: {"a" : "A", "b" : "B"}
       result: ["A"]
+    - name: dot_child_absent
+      selector: "$.c"
+      document: {"a" : "A", "b" : "B"}
+      result: []
+    - name: dot_child_of_array
+      selector: "$.a"
+      document: ["first", "second"]
+      result: []
     - name: wildcarded_child
       selector: "$.*"
       document: {"a" : "A", "b" : "B"}
       result: ["A", "B"]
+    - name: wildcarded_child_of_array
+      selector: "$.*"
+      document: ["first", "second"]
+      result: []
+    - name: wildcarded_child_dot_child
+      selector: "$.*.a"
+      document: {"x": {"a" : "Ax", "b" : "Bx"}, "y": {"a" : "Ay", "b" : "By"}}
+      result: ["Ax", "Ay"]