Implemented find_last() function

Author: springcomp

jmespath/functions.py

@@ -321,6 +321,19 @@ def _func_find_first(self, text, search, start = 0, end = -1):
         pos = text.find(search, start, end)
         return pos if pos != -1 else None
 
+    @signature(
+        {'type': 'string'},
+        {'type': 'string'},
+        {'type': 'number', 'optional': True},
+        {'type': 'number', 'optional': True})
+    def _func_find_last(self, text, search, start = 0, end = -1):
+        if len(search) == 0:
+            return None
+        if end == -1:
+            end = len(text)
+        pos = text[start:end].rfind(search)
+        return start + pos if pos != -1 else None
+
     @signature(
         {'type': 'string'},
         {'type': 'number'},

tests/compliance/string_functions.json

@@ -36,10 +36,11 @@
 
       { "expression": "find_last(string, 'string')", "result": 8 },
       { "expression": "find_last(string, 'string', `8`)", "result": 8 },
-      { "expression": "find_last(string, 'string', `7`)", "result":	null },
-      { "expression": "find_last(string, 's', `8`)", "result":	8 },
-      { "expression": "find_last(string, 's', `7`)", "result":	0 },
-
+      { "expression": "find_last(string, 'string', `8`, `9`)", "result":	null },
+      { "expression": "find_last(string, 'string', `9`)", "result":	null },
+      { "expression": "find_last(string, 's', `1`)", "result":	8 },
+      { "expression": "find_last(string, 's', `0`, `7`)", "result":	0 },
+      
       { "expression": "lower('STRING')", "result":	"string" },
       { "expression": "upper('string')", "result":	"STRING" },