Drop newer features like match case and str.removeprefix

exercism · Dec 18, 2022 · 2fba891 · 2fba891
1 parent 33afa50
commit 2fba891
Showing 1 changed file with 35 additions and 35 deletions.
diff --git a/exercises/practice/sgf-parsing/.meta/example.py b/exercises/practice/sgf-parsing/.meta/example.py
@@ -64,42 +64,41 @@ def parse_node(sgf: str) -> SgfTree:
     children = []
 
     while idx < len(sgf):
-        match sgf[idx]:
-            case "[":
-                # Parse property values.
-                if idx == prop_key_start:
-                    raise ValueError("propery key is empty")
-                prop_key = sgf[prop_key_start:idx]
-                if not prop_key.isupper():
-                    raise ValueError('property must be in uppercase')
-
-                idx, prop_vals = parse_property_vals(sgf, idx)
-                properties[prop_key].extend(prop_vals)
-
-                # New property.
-                prop_key_start = idx
-            case ";":
-                # Single child.
-                child = parse_node(sgf[idx:])
-                children.append(child)
-                break
-            case "(":
-                # Multiple children.
-                children = []
-                while idx < len(sgf):
-                    if sgf[idx] != "(":
-                        break
-                    # Child start.
-                    idx += 1
-                    child_start = idx
-                    while sgf[idx] != ")":
-                        idx += 1
-                    # Child end.
-                    child = parse_node(sgf[child_start:idx])
-                    children.append(child)
+        if sgf[idx] == "[":
+            # Parse property values.
+            if idx == prop_key_start:
+                raise ValueError("propery key is empty")
+            prop_key = sgf[prop_key_start:idx]
+            if not prop_key.isupper():
+                raise ValueError('property must be in uppercase')
+
+            idx, prop_vals = parse_property_vals(sgf, idx)
+            properties[prop_key].extend(prop_vals)
+
+            # New property.
+            prop_key_start = idx
+        elif sgf[idx] == ";":
+            # Single child.
+            child = parse_node(sgf[idx:])
+            children.append(child)
+            break
+        elif sgf[idx] == "(":
+            # Multiple children.
+            children = []
+            while idx < len(sgf):
+                if sgf[idx] != "(":
+                    break
+                # Child start.
+                idx += 1
+                child_start = idx
+                while sgf[idx] != ")":
                     idx += 1
-            case _:
+                # Child end.
+                child = parse_node(sgf[child_start:idx])
+                children.append(child)
                 idx += 1
+        else:
+            idx += 1
 
     if idx > prop_key_start and not properties:
         raise ValueError('properties without delimiter')
@@ -112,4 +111,5 @@ def parse(sgf: str) -> SgfTree:
         raise ValueError('tree missing')
     if not sgf.startswith("(;"):
         raise ValueError('tree with no nodes')
-    return parse_node(sgf.removeprefix("(").removesuffix(")"))
+    inside = sgf[1:-1]
+    return parse_node(inside)