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
+    """
+    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 invalid according to 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 tree with no nodes
+    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: A tuple containing the parsed SgfTree and the next index to parse from
+    """
+    # 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] not in '();':
+        # Parse key
+        key_start = index
+        while index < len(content) and content[index].isalpha() and content[index].isupper():
+            index += 1
+        # Edge Case: Property key is not in uppercase
+        if index == key_start:
+            raise ValueError("property must be in uppercase")
+        key = content[key_start:index]
+        # 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 the opening bracket
+            value, index = _parse_value(content, index)
+            values.append(value)
+            # Edge Case: Missing closing bracket for property value
+            if index >= len(content) or content[index] != ']':
+                raise ValueError("properties without delimiter")
+            index += 1  # Skip the closing bracket
+        properties[key] = values
+    # Parse children
+    children = []
+    # Handle children in parentheses (variations)
+    while index < len(content) and content[index] == '(':
+        child, index = _parse_tree(content, index + 1)  # Skip the opening parenthesis
+        children.append(child)
+        # Skip the closing parenthesis
+        # Edge Case: Missing closing parenthesis for child
+        if index >= len(content) or content[index] != ')':
+            raise ValueError("tree missing")
+        index += 1
+    # Handle sequential semicolons (parent-child relationships)
+    while index < len(content) and content[index] == ';':
+        child, index = _parse_tree(content, index)  # Start from the semicolon
+        children.append(child)
+    return SgfTree(properties, children), index
+def _parse_value(content: str, index: int) -> tuple[str, int]:
+    """
+    Parse a value from the content string starting at index.
+    Args:
+        content: The SGF content string
+        index: The starting index to parse from (should be pointing to the content inside brackets)
+    Returns:
+        tuple: A tuple containing the parsed value string and the next index to parse from
+    """
+    result = []
+    while index < len(content):
+        if content[index] == ']':
+            # Found the end of the value
+            break
+        elif content[index] == '\\':
+            # Handle escape sequences
+            index += 1
+            if index >= len(content):
+                # Edge Case: Escape character at end of content
+                result.append('\\')
+                break
+            char = content[index]
+            if char == '\n':
+                # Edge Case: Newline escaped with backslash - remove the newline
+                # The newline is removed, so we don't append anything
+                pass
+            elif char.isspace():
+                # Edge Case: Whitespace after backslash - convert to space
+                result.append(' ')
+            else:
+                # Edge Case: Non-whitespace character after backslash - insert as-is
+                result.append(char)
+        elif content[index] == '\n':
+            # Edge Case: Unescaped newline - keep as newline
+            result.append(content[index])
+        elif content[index].isspace() and content[index] != '\n':
+            # Edge Case: Whitespace other than newline - convert to space
+            result.append(' ')
+        else:
+            # Edge Case: Regular character - insert as-is
+            result.append(content[index])
+        index += 1
+    return ''.join(result), index
+# Handled Edge Cases: Empty input, Input doesn't start with '(', Input doesn't end with ')', Empty tree with no nodes, Missing semicolon at the beginning of a node, Property key is not in uppercase, Missing opening bracket for property value, Missing closing bracket for property value, Missing closing parenthesis for child, Escape character at end of content, Newline escaped with backslash, Tab escaped with backslash, Whitespace after backslash, Non-whitespace character after backslash, Unescaped newline, Whitespace other than newline
+# Handled Edge Cases: Property key is not in uppercase, Missing opening bracket for property value, Missing closing bracket for property value
+# Handled Edge Cases: Missing closing parenthesis for child
+# Handled Edge Cases: Escape character at end of content, Newline escaped with backslash - remove if immediately after \, Tab escaped with backslash - convert to space, Whitespace after backslash - convert to space, Non-whitespace character after backslash - insert as-is, Unescaped newline - keep as newline, Whitespace other than newline - convert to space, Regular character - insert as-is

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