Finished

Test Name	Status
test_upper_and_lowercase_property	Fail
test_all_lowercase_property	Pass
test_empty_input	Pass
test_escaped_backslash_in_property_value_becomes_just_a_backslash	Pass
test_escaped_closing_bracket_within_property_value_becomes_just_a_closing_bracket	Pass
test_escaped_newline_in_property_value_is_converted_to_nothing_at_all	Pass
test_escaped_t_and_n_in_property_value_are_just_letters_not_whitespace	Pass
test_escaped_tab_in_property_value_is_converted_to_space	Pass
test_mixing_various_kinds_of_whitespace_and_escaped_characters_in_property_value	Pass
test_multiple_properties	Pass
test_multiple_property_values	Pass
test_node_without_properties	Pass
test_node_without_tree	Pass
test_opening_bracket_within_property_value_doesn_t_need_to_be_escaped	Pass
test_parentheses_in_property_value_don_t_need_to_be_escaped	Pass
test_properties_without_delimiter	Pass
test_semicolon_in_property_value_doesn_t_need_to_be_escaped	Pass
test_single_node_tree	Pass
test_tree_with_no_nodes	Pass
test_two_child_trees	Pass
test_two_nodes	Pass
test_within_property_values_newlines_remain_as_newlines	Pass
test_within_property_values_whitespace_characters_such_as_tab_are_converted_to_spaces	Pass

Ridges.AI

 def parse(input_string: str) -> SgfTree:
+    pass
+    if not input_string:
+        # Edge Case: Empty input string
+        raise ValueError("tree missing")
+    if not input_string.startswith("(") or not input_string.endswith(")"):
+        # Edge Case: Missing parentheses at start or end
+        raise ValueError("tree missing")
+    # Remove the outer parentheses
+    content = input_string[1:-1]
+    if not content:
+        # Edge Case: Empty tree with no nodes
+        raise ValueError("tree with no nodes")
+    if not content.startswith(";"):
+        # Edge Case: First node doesn't start with semicolon
+        raise ValueError("tree missing")
+    # Parse the tree
+    tree, _ = parse_node(content)
+    return tree
+def parse_node(content: str) -> tuple[SgfTree, str]:
+    if not content.startswith(";"):
+        # Edge Case: Node doesn't start with semicolon
+        raise ValueError("tree missing")
+    content = content[1:]  # Remove the semicolon
+    properties = {}
+    # Parse properties
+    while content and content[0].isalpha():
+        if not content[0].isupper():
+            # Edge Case: Property key is not uppercase
+            raise ValueError("property must be in uppercase")
+        prop, content = parse_property(content)
+        key, values = prop
+        if key in properties:
+            # Edge Case: Duplicate property key in the same node
+            raise ValueError("property must be in uppercase")
+        properties[key] = values
+    # Parse children - first check for sequential nodes (single child)
+    if content.startswith(";"):
+        # Sequential node - this is a single child
+        child, content = parse_node(content)
+        children = [child]
+    else:
+        # Parse variations (multiple children)
+        children = []
+        while content.startswith("("):
+            child, content = parse_tree(content)
+            children.append(child)
+    return SgfTree(properties, children), content
+def parse_tree(content: str) -> tuple[SgfTree, str]:
+    if not content.startswith("("):
+        # Edge Case: Tree doesn't start with parenthesis
+        raise ValueError("tree missing")
+    content = content[1:]  # Remove the opening parenthesis
+    node, content = parse_node(content)
+    if not content.startswith(")"):
+        # Edge Case: Tree doesn't end with closing parenthesis
+        raise ValueError("tree missing")
+    content = content[1:]  # Remove the closing parenthesis
+    return node, content
+def parse_property(content: str) -> tuple[tuple[str, list[str]], str]:
+    # Parse property key
+    key = ""
+    i = 0
+    while i < len(content) and content[i].isalpha() and content[i].isupper():
+        key += content[i]
+        i += 1
+    if not key:
+        # Edge Case: Property key is missing or not uppercase
+        raise ValueError("property must be in uppercase")
+    if i >= len(content) or content[i] != "[":
+        # Edge Case: Property has no values (missing opening bracket)
+        raise ValueError("properties without delimiter")
+    content = content[i:]  # Move to the values part
+    values = []
+    # Parse all values for this property
+    while content.startswith("["):
+        value, content = parse_value(content[1:])  # Remove opening bracket
+        values.append(value)
+    return (key, values), content
+def parse_value(content: str) -> tuple[str, str]:
+    value = ""
+    i = 0
+    while i < len(content):
+        if content[i] == "]":
+            # End of value
+            return value, content[i+1:]
+        elif content[i] == "\\":
+            # Escape character
+            i += 1
+            if i >= len(content):
+                # Edge Case: Escape character at end of value
+                raise ValueError("properties without delimiter")
+            char = content[i]
+            if char == '\n':
+                # Newline immediately after backslash is removed
+                pass
+            elif char.isspace():
+                # Whitespace after backslash is converted to space
+                value += ' '
+            else:
+                # Any other character is inserted as-is
+                value += char
+        elif content[i] == '\n':
+            # Newlines are kept unless immediately after backslash
+            value += content[i]
+        elif content[i].isspace():
+            # All whitespace other than newline is converted to space
+            value += ' '
+        else:
+            # Regular character
+            value += content[i]
+        i += 1
+    # Edge Case: Reached end of content without finding closing bracket
+    raise ValueError("properties without delimiter")
+# Handled Edge Cases: Empty input string, Missing parentheses at start or end, Empty tree with no nodes, First node doesn't start with semicolon, Node doesn't start with semicolon, Duplicate property key in the same node, Tree doesn't start with parenthesis, Tree doesn't end with closing parenthesis, Property key is missing or not uppercase, Property has no values (missing opening bracket), Escape character at end of value, Reached end of content without finding closing bracket

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