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

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 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: Missing opening parenthesis
+    if not input_string.startswith('('):
+        raise ValueError("tree missing")
+    # Edge Case: Missing closing parenthesis
+    if not input_string.endswith(')'):
+        raise ValueError("tree missing")
+    # Remove the outer parentheses
+    content = input_string[1:-1]
+    # Edge Case: Empty tree
+    if not content:
+        raise ValueError("tree with no nodes")
+    # Edge Case: Missing semicolon after opening parenthesis
+    if not content.startswith(';'):
+        raise ValueError("tree missing")
+    return _parse_tree_content(content)
+def _parse_tree_content(content: str) -> SgfTree:
+    """
+    Parse the content inside the parentheses of an SGF tree.
+    Args:
+        content: The content string without outer parentheses
+    Returns:
+        SgfTree: The parsed SGF tree
+    """
+    # Skip the initial semicolon
+    index = 1
+    # Parse properties of the current node
+    properties, index = _parse_properties(content, index)
+    # Parse children
+    children = []
+    # Edge Case: Handle sequential nodes (separated by semicolons) and variations (parenthesized)
+    while index < len(content):
+        if content[index] == ';':
+            # Sequential node - parse the rest as a new tree
+            sequential_content = content[index:]
+            # Create a new tree by parsing the sequential content
+            # We need to wrap it in parentheses to make it a valid SGF tree
+            child_tree = _parse_sequential_node(sequential_content)
+            children.append(child_tree)
+            break  # Sequential nodes form a chain, so we're done
+        elif content[index] == '(':
+            # Variation - parse all child trees in parentheses
+            # Find matching closing parenthesis
+            paren_count = 1
+            start = index
+            index += 1
+            while index < len(content) and paren_count > 0:
+                if content[index] == '(':
+                    paren_count += 1
+                elif content[index] == ')':
+                    paren_count -= 1
+                index += 1
+            # Extract the subtree content (including parentheses)
+            subtree_content = content[start:index]
+            # Parse the subtree
+            child_tree = parse(subtree_content)
+            children.append(child_tree)
+        else:
+            # Invalid character
+            index += 1
+    return SgfTree(properties, children)
+def _parse_sequential_node(sequential_content: str) -> SgfTree:
+    """
+    Parse a sequential node (content starting with semicolon).
+    Args:
+        sequential_content: Content starting with semicolon
+    Returns:
+        SgfTree: The parsed sequential node tree
+    """
+    # Skip the semicolon
+    index = 1
+    # Parse properties of this sequential node
+    properties, index = _parse_properties(sequential_content, index)
+    # Parse children of this sequential node
+    children = []
+    # Check if there are more sequential nodes or variations
+    while index < len(sequential_content):
+        if sequential_content[index] == ';':
+            # Another sequential node
+            child_content = sequential_content[index:]
+            child_tree = _parse_sequential_node(child_content)
+            children.append(child_tree)
+            break
+        elif sequential_content[index] == '(':
+            # Variation
+            paren_count = 1
+            start = index
+            index += 1
+            while index < len(sequential_content) and paren_count > 0:
+                if sequential_content[index] == '(':
+                    paren_count += 1
+                elif sequential_content[index] == ')':
+                    paren_count -= 1
+                index += 1
+            subtree_content = sequential_content[start:index]
+            child_tree = parse(subtree_content)
+            children.append(child_tree)
+        else:
+            index += 1
+    return SgfTree(properties, children)
+def _parse_properties(content: str, start_index: int) -> tuple[dict, int]:
+    """
+    Parse properties from the content string starting at start_index.
+    Args:
+        content: The content string
+        start_index: The index to start parsing from
+    Returns:
+        tuple: A tuple of (properties_dict, next_index)
+    """
+    properties = {}
+    index = start_index
+    # Edge Case: Parse properties while we have letters followed by [
+    # We need to check if the next character is a letter (could be uppercase or lowercase)
+    while index < len(content) and content[index].isalpha():
+        # Parse key (all consecutive letters)
+        key_start = index
+        while index < len(content) and content[index].isalpha():
+            index += 1
+        key = content[key_start:index]
+        # Validate that the key is not empty and consists only of uppercase letters
+        if not key or not all(c.isupper() for c in key):
+            raise ValueError("property must be in uppercase")
+        # Edge Case: Key must be followed by at least one value in brackets
+        if index >= len(content) or content[index] != '[':
+            raise ValueError("properties without delimiter")
+        # Parse all values for this key
+        values = []
+        # Edge Case: Parse multiple values for the same key
+        while index < len(content) and content[index] == '[':
+            index += 1  # Skip opening bracket
+            value_start = index
+            # Parse value, handling escaped characters
+            while index < len(content):
+                if content[index] == ']':
+                    # Check if this bracket is escaped
+                    # Count consecutive backslashes before this bracket
+                    backslash_count = 0
+                    check_index = index - 1
+                    while check_index >= value_start and content[check_index] == '\\':
+                        backslash_count += 1
+                        check_index -= 1
+                    # If odd number of backslashes, this bracket is escaped
+                    if backslash_count % 2 == 1:
+                        index += 1  # Skip the escaped bracket
+                    else:
+                        break  # This is the real end of the value
+                else:
+                    index += 1
+            # Edge Case: Missing closing bracket
+            if index >= len(content):
+                raise ValueError("properties without delimiter")
+            value = content[value_start:index]
+            # Process the value according to SGF text type rules
+            value = _process_sgf_text(value)
+            values.append(value)
+            index += 1  # Skip closing bracket
+            # Check if there's another value for the same property or a new property
+            # If the next character is not '[', we're done with this property
+            if index >= len(content) or content[index] != '[':
+                break
+        properties[key] = values
+    return properties, index
+def _process_sgf_text(text: str) -> str:
+    """
+    Process SGF text according to SGF Text type rules.
+    Args:
+        text: The raw text from SGF
+    Returns:
+        str: The processed text
+    """
+    result = []
+    i = 0
+    while i < len(text):
+        # Edge Case: Handle escape character
+        if text[i] == '\\':
+            i += 1
+            # Edge Case: Check if there's a next character
+            if i < len(text):
+                char = text[i]
+                # Edge Case: Newlines are removed if they come immediately after a \
+                if char == '\n':
+                    pass  # Remove the newline
+                # Edge Case: All whitespace characters other than newline are converted to spaces
+                elif char.isspace():
+                    result.append(' ')
+                # Edge Case: Any non-whitespace character after \ is inserted as-is
+                else:
+                    result.append(char)
+            # Edge Case: Handle escape at end of string
+            else:
+                result.append('\\')
+        else:
+            char = text[i]
+            # Edge Case: All whitespace characters other than newline are converted to spaces
+            if char != '\n' and char.isspace():
+                result.append(' ')
+            else:
+                result.append(char)
+        i += 1
+    return ''.join(result)
+# Handled Edge Cases: Empty input, Missing opening parenthesis, Missing closing parenthesis, Empty tree, Missing semicolon after opening parenthesis, Multiple variations - parse all child trees in parentheses, Parse properties while we have uppercase letters followed by [, Key must be followed by at least one value in brackets, Parse multiple values for the same key, Handle escaped characters, Missing closing bracket, Handle escape character, Check if there's a next character, Newlines are removed if they come immediately after a \, All whitespace characters other than newline are converted to spaces, Any non-whitespace character after \ is inserted as-is, Handle escape at end of string