Finished

Test Name	Status
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_upper_and_lowercase_property	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

         self.properties = properties or {}
         self.children = children or []
     def __eq__(self, other):
         if not isinstance(other, SgfTree):
             return False
 def parse(input_string: str) -> SgfTree:
+    pass
+    """
+    Parse an SGF string and return a tree structure of properties.
+    Args:
+        input_string: A string in SGF format
+    Returns:
+        SgfTree: The parsed SGF tree
+    Raises:
+        ValueError: If the input is malformed or doesn't follow SGF format rules
+    """
+    # Edge Case: Empty input
+    if not input_string:
+        raise ValueError("tree missing")
+    # Edge Case: Input doesn't start with '('
+    if not input_string.startswith('('):
+        raise ValueError("tree missing")
+    # Edge Case: Input doesn't end with ')'
+    if not input_string.endswith(')'):
+        raise ValueError("tree missing")
+    # Remove the outer parentheses
+    content = input_string[1:-1]
+    # Edge Case: Empty content after removing parentheses
+    if not content:
+        raise ValueError("tree with no nodes")
+    # Parse the tree
+    tree, _ = _parse_tree(content, 0)
+    return tree
+def _parse_tree(content: str, index: int) -> tuple[SgfTree, int]:
+    """
+    Parse a tree from the content string starting at index.
+    Args:
+        content: The SGF content string
+        index: The starting index to parse from
+    Returns:
+        tuple: (SgfTree, next_index)
+    """
+    # Edge Case: Missing semicolon at the beginning of a node
+    if index >= len(content) or content[index] != ';':
+        raise ValueError("tree missing")
+    index += 1  # Skip the semicolon
+    # Parse properties of the current node
+    properties = {}
+    while index < len(content) and content[index].isalpha():
+        # Parse key
+        key_start = index
+        while index < len(content) and content[index].isalpha():
+            index += 1
+        key = content[key_start:index]
+        # Edge Case: Key is not in uppercase
+        if not key.isupper():
+            raise ValueError("property must be in uppercase")
+        # Edge Case: Missing opening bracket for property value
+        if index >= len(content) or content[index] != '[':
+            raise ValueError("properties without delimiter")
+        # Parse values
+        values = []
+        while index < len(content) and content[index] == '[':
+            index += 1  # Skip opening bracket
+            # Parse value content, handling escapes
+            value_chars = []
+            while index < len(content) and content[index] != ']':
+                if content[index] == '\\':
+                    # Handle escape sequences
+                    index += 1
+                    if index >= len(content):
+                        raise ValueError("properties without delimiter")
+                    # Check if the next character is a newline
+                    if content[index] == '\n':
+                        # Newline immediately after backslash is removed
+                        # Don't add anything to value_chars
+                        pass
+                    elif content[index].isspace():
+                        # Other whitespace after backslash is converted to spaces
+                        value_chars.append(' ')
+                    else:
+                        # Any non-whitespace character after backslash is inserted as-is
+                        value_chars.append(content[index])
+                else:
+                    # Convert whitespace (except newlines) to spaces
+                    if content[index].isspace() and content[index] != '\n':
+                        value_chars.append(' ')
+                    else:
+                        value_chars.append(content[index])
+                index += 1
+            # Edge Case: Missing closing bracket
+            if index >= len(content) or content[index] != ']':
+                raise ValueError("properties without delimiter")
+            values.append(''.join(value_chars))
+            index += 1  # Skip closing bracket
+        properties[key] = values
+    # Parse children - either variations in parentheses or sequential nodes
+    children = []
+    # First handle variations (nodes in parentheses)
+    while index < len(content) and content[index] == '(':
+        # Parse child tree
+        child_tree, index = _parse_tree(content, index+1)  # Skip opening parenthesis
+        # Find closing parenthesis
+        if index >= len(content) or content[index] != ')':
+            raise ValueError("tree missing")
+        children.append(child_tree)
+        index += 1  # Skip closing parenthesis
+    # Then handle sequential nodes (nodes separated by semicolons)
+    if index < len(content) and content[index] == ';':
+        # Parse the next sequential node
+        next_node, index = _parse_tree(content, index)
+        children.append(next_node)
+    return SgfTree(properties, children), index
+# Handled Edge Cases: Empty input, Input doesn't start with '(', Input doesn't end with ')', Empty content after removing parentheses, Missing semicolon at the beginning of a node, Key is not in uppercase, Missing opening bracket for property value, Missing closing bracket, Missing closing parenthesis for tree"

rockstar

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Passed