Finished

Test Name	Status
test_escaped_newline_in_property_value_is_converted_to_nothing_at_all	Fail
test_escaped_t_and_n_in_property_value_are_just_letters_not_whitespace	Fail
test_mixing_various_kinds_of_whitespace_and_escaped_characters_in_property_value	Fail
test_opening_bracket_within_property_value_doesn_t_need_to_be_escaped	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_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_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: 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 inside the parentheses
+    Returns:
+        SgfTree: The parsed SGF tree
+    """
+    # Skip the initial semicolon
+    index = 1
+    # Parse properties of the current node
+    properties = {}
+    while index < len(content) and content[index] not in '(;)' and content[index] != ')':
+        # Parse a property
+        prop_start = index
+        # Edge Case: Property key must be uppercase
+        while index < len(content) and content[index].isalpha():
+            if not content[index].isupper():
+                raise ValueError("property must be in uppercase")
+            index += 1
+        # Edge Case: Empty property key
+        if index == prop_start:
+            raise ValueError("properties without delimiter")
+        key = content[prop_start:index]
+        # Edge Case: Missing opening bracket
+        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
+            value_start = index
+            # Parse value content, handling escapes
+            value_chars = []
+            while index < len(content):
+                if content[index] == ']':
+                    # End of value
+                    break
+                elif content[index] == '\\':
+                    # Handle escape character
+                    index += 1
+                    if index >= len(content):
+                        raise ValueError("properties without delimiter")
+                    # Any character after \ is inserted as-is, including ]
+                    char = content[index]
+                    # Apply whitespace conversion rules even for escaped characters
+                    if char == 'n' and index >= 1 and content[index-1] == '\\':
+                        # Remove actual newlines that come immediately after \
+                        # This handles both literal \n in string and actual newlines
+                        index += 1
+                        continue
+                    if char == ']':
+                        # Escaped ] should be treated as literal ] and end current value
+                        value_chars.append(char)
+                        index += 1
+                        break  # End this value and move to next property
+                    elif char in ' \t\r':
+                        char = ' '
+                        value_chars.append(char)
+                        index += 1
+                    else:
+                        value_chars.append(char)
+                        index += 1
+                else:
+                    # Normal character
+                    char = content[index]
+                    # All whitespace characters other than newline are converted to spaces
+                    if char in ' \t\r':
+                        char = ' '
+                    value_chars.append(char)
+                    index += 1
+            # Edge Case: Missing closing bracket
+            if index >= len(content) or content[index] != ']':
+                raise ValueError("properties without delimiter")
+            value = ''.join(value_chars)
+            values.append(value)
+            index += 1  # Skip closing bracket
+        properties[key] = values
+    # Parse children
+    children = []
+    # Handle semicolon shorthand for single child nodes
+    if index < len(content) and content[index] == ';':
+        # This is a shorthand for a single child node
+        child_content = content[index:]  # Include the semicolon
+        child_tree = _parse_tree_content(child_content)
+        children.append(child_tree)
+        index = len(content)  # We've consumed all content
+    # Handle explicit children in parentheses
+    while index < len(content) and content[index] == '(':
+        # Find the matching closing parenthesis for this child
+        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
+        # Edge Case: Mismatched parentheses
+        if paren_count != 0:
+            raise ValueError("tree missing")
+        # Parse the child tree
+        child_content = content[start+1:index-1]
+        # Edge Case: Empty child
+        if not child_content:
+            raise ValueError("tree with no nodes")
+        # Edge Case: Missing semicolon in child
+        if not child_content.startswith(';'):
+            raise ValueError("tree missing")
+        child_tree = _parse_tree_content(child_content)
+        children.append(child_tree)
+    # Edge Case: Unexpected characters after properties and children
+    if index < len(content):
+        raise ValueError("tree missing")
+    return SgfTree(properties, children)
+    # Handled Edge Cases: Empty input, missing opening parenthesis, missing closing parenthesis,
+    # empty tree, missing semicolon after opening parenthesis, property key not uppercase,
+    # empty property key, missing opening bracket, missing closing bracket, mismatched parentheses,
+    # empty child, missing semicolon in child, unexpected characters after properties and children

@ngel

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