Reject repeated numbers in slice components

CHANGELOG.rst

@@ -1,7 +1,7 @@
 Next Release (TBD)
 ==================
 
-* No changes yet.
+* Reject slice expressions with multiple numbers in the same component.
 
 
 1.1.0

jmespath/parser.py

@@ -237,7 +237,7 @@ def _parse_slice_expression(self):
                     self._raise_parse_error_for_token(
                         self._lookahead_token(0), 'syntax error')
                 self._advance()
-            elif current_token == 'number':
+            elif current_token == 'number' and parts[index] is None:
                 parts[index] = self._lookahead_token(0)['value']
                 self._advance()
             else:

tests/compliance/slice.json

@@ -14,6 +14,14 @@
       "expression": "foo[0:10:1]",
       "result": [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
     },
+    {
+      "expression": "foo[ 0 : 4 : 2 ]",
+      "result": [0, 2]
+    },
+    {
+      "expression": "foo[0:0:1]",
+      "result": []
+    },
     {
       "expression": "foo[0:10]",
       "result": [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
@@ -118,6 +126,38 @@
       "expression": "foo[8:2:0]",
       "error": "invalid-value"
     },
+    {
+      "expression": "foo[0:1 3]",
+      "error": "syntax"
+    },
+    {
+      "expression": "foo[0:1-2]",
+      "error": "syntax"
+    },
+    {
+      "expression": "foo[0:0 2]",
+      "error": "syntax"
+    },
+    {
+      "expression": "foo[::1 2]",
+      "error": "syntax"
+    },
+    {
+      "expression": "foo[::1-2]",
+      "error": "syntax"
+    },
+    {
+      "expression": "foo[::0 2]",
+      "error": "syntax"
+    },
+    {
+      "expression": "foo[0:1 3:2]",
+      "error": "syntax"
+    },
+    {
+      "expression": "[::1 2]",
+      "error": "syntax"
+    },
     {
       "expression": "foo[8:2:0:1]",
       "error": "syntax"