Finished

Test Name	Status
test_escaped_newline_in_property_value_is_converted_to_nothing_at_all	Fail
test_mixing_various_kinds_of_whitespace_and_escaped_characters_in_property_value	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_t_and_n_in_property_value_are_just_letters_not_whitespace	Pass
test_escaped_tab_in_property_value_is_converted_to_space	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

 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: A tree structure representing the SGF data
+    Raises:
+        ValueError: If the input is invalid according to SGF format rules
+    """
+    # Edge Case: Empty input or input that doesn't start with '('
+    if not input_string or not input_string.startswith('('):
+        raise ValueError("tree missing")
+    # Edge Case: Input that 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")
+    # Edge Case: Content that doesn't start with ';'
+    if not content.startswith(';'):
+        raise ValueError("tree missing")
+    return _parse_tree(content)
+def _parse_tree(content: str) -> SgfTree:
+    """
+    Parse a tree from SGF content.
+    Args:
+        content: SGF content starting with ';'
+    Returns:
+        SgfTree: Parsed tree
+    """
+    # Skip the initial ';'
+    content = content[1:]
+    # Parse properties of the current node
+    properties, remaining = _parse_properties(content)
+    children = []
+    # Parse children if any
+    while remaining:
+        if remaining.startswith('('):
+            # Parse variation (child in parentheses)
+            # Find the matching closing parenthesis
+            balance = 1
+            i = 1  # Start after the opening '('
+            while i < len(remaining) and balance > 0:
+                if remaining[i] == '(':
+                    balance += 1
+                elif remaining[i] == ')':
+                    balance -= 1
+                i += 1
+            # Edge Case: Unmatched parentheses
+            if balance != 0:
+                raise ValueError("tree missing")
+            # Parse the child tree
+            child_content = remaining[1:i-1]
+            child_tree = _parse_tree(child_content)
+            children.append(child_tree)
+            # Move to the next potential child
+            remaining = remaining[i:]
+        elif remaining.startswith(';'):
+            # Parse sequential node (child after semicolon)
+            child_tree = _parse_tree(remaining)
+            children.append(child_tree)
+            remaining = ''  # All remaining content consumed by child
+        else:
+            # Invalid content - not a variation or sequential node
+            break
+    return SgfTree(properties, children)
+def _parse_properties(content: str) -> tuple[dict, str]:
+    """
+    Parse properties from SGF content.
+    Args:
+        content: SGF content containing properties
+    Returns:
+        tuple: (properties dict, remaining content)
+    """
+    properties = {}
+    remaining = content
+    while remaining and remaining[0].isalpha():
+        # Parse property key
+        key_end = 0
+        while key_end < len(remaining) and remaining[key_end].isalpha():
+            key_end += 1
+        key = remaining[:key_end]
+        # Edge Case: Property key is not uppercase
+        if key != key.upper():
+            raise ValueError("property must be in uppercase")
+        remaining = remaining[key_end:]
+        # Edge Case: Missing opening bracket for property value
+        if not remaining.startswith('['):
+            raise ValueError("properties without delimiter")
+        values = []
+        # Parse all values for this key
+        while remaining.startswith('['):
+            remaining = remaining[1:]  # Skip '['
+            # Parse value
+            value, remaining = _parse_value(remaining)
+            # Edge Case: Missing closing bracket
+            if not remaining.startswith(']'):
+                raise ValueError("properties without delimiter")
+            remaining = remaining[1:]  # Skip ']'
+            values.append(value)
+        properties[key] = values
+    return properties, remaining
+def _parse_value(content: str) -> tuple[str, str]:
+    """
+    Parse a value from SGF content, handling escape sequences.
+    Args:
+        content: SGF content starting with the value
+    Returns:
+        tuple: (parsed value, remaining content)
+    """
+    value = []
+    i = 0
+    while i < len(content):
+        char = content[i]
+        if char == ']':
+            # End of value
+            break
+        elif char == '\\':
+            # Handle escape sequence
+            i += 1
+            if i >= len(content):
+                # Edge Case: Escape character at end of content
+                value.append('\\')
+                break
+            next_char = content[i]
+            if next_char == '\n':
+                # Newline is removed if immediately after \, but we add a space
+                value.append(' ')
+            elif next_char in ' \t\r':
+                # Whitespace after escape converted to space
+                value.append(' ')
+            else:
+                # Any non-whitespace character after \ is inserted as-is
+                value.append(next_char)
+        elif char in ' \t\r':
+            # All whitespace characters other than newline are converted to spaces
+            value.append(' ')
+        elif char == '\n':
+            # Newlines remain as newlines unless immediately after \
+            value.append(char)
+        else:
+            # Regular character
+            value.append(char)
+        i += 1
+    return ''.join(value), content[i:]
+# Handled Edge Cases: Empty input, missing opening parenthesis, missing closing parenthesis, empty content after parentheses, missing semicolon, unmatched parentheses, property key not uppercase, missing opening bracket, missing closing bracket, escape character at end of content\n

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