Finished

Test Name	Status
test_escaped_t_and_n_in_property_value_are_just_letters_not_whitespace	Fail
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_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 for parsing
+    Returns:
+        tuple: A tuple containing the parsed SgfTree and the next index to parse
+    """
+    # Edge Case: No semicolon to start 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: Key is not in uppercase
+        if index == key_start:
+            raise ValueError("property must be in uppercase")
+        key = content[key_start:index]
+        # Edge Case: No delimiter after key
+        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 '['
+            value, index = _parse_value(content, index)
+            # Edge Case: Missing closing bracket
+            if index >= len(content) or content[index] != ']':
+                raise ValueError("properties without delimiter")
+            index += 1  # Skip ']'
+            values.append(value)
+        properties[key] = values
+    # Parse children
+    children = []
+    while index < len(content):
+        print(f"DEBUG: In children loop, index={index}, char='{content[index] if index < len(content) else 'EOF'}'")
+        if content[index] == '(':
+            # Handle variations (child trees in parentheses)
+            child, index = _parse_tree(content, index + 1)  # Skip '('
+            # Find the matching ')'
+            paren_count = 1
+            i = index
+            while i < len(content) and paren_count > 0:
+                if content[i] == '(':
+                    paren_count += 1
+                elif content[i] == ')':
+                    paren_count -= 1
+                i += 1
+            # Edge Case: Unmatched parenthesis
+            if paren_count != 0:
+                raise ValueError("tree missing")
+            index = i
+            children.append(child)
+        elif content[index] == ';':
+            # Handle sequential nodes - parse one node at a time
+            print(f"DEBUG: About to parse sequential node at index {index}")
+            child, index = _parse_tree(content, index)  # Parse the node starting with semicolon
+            print(f"DEBUG: Parsed sequential node, new index {index}, adding child with properties {child.properties}")
+            children.append(child)
+            print(f"DEBUG: Children count now: {len(children)}")
+        else:
+            # End of this node's children
+            break
+    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 for parsing
+    Returns:
+        tuple: A tuple containing the parsed value and the next index to parse
+    """
+    result = []
+    while index < len(content) and content[index] != ']':
+        if content[index] == '\\':
+            # Handle escape sequences
+            index += 1
+            if index >= len(content):
+                # Edge Case: Escape character at end of string
+                result.append('\\')
+                break
+            char = content[index]
+            if char == 'n' or char == 'r' or char == 't':
+                # These are not special escape sequences in SGF, just literal characters
+                result.append('\\')
+                result.append(char)
+            elif char == '\\':
+                # Escaped backslash
+                result.append('\\')
+            elif char.isspace():
+                # Whitespace after backslash
+                if char == '\n':
+                    # Newline immediately after backslash is removed
+                    pass
+                else:
+                    # Other whitespace becomes space
+                    result.append(' ')
+            else:
+                # Any other character is inserted as-is
+                result.append(char)
+        elif content[index] == '\n':
+            # Newlines are kept as newlines
+            result.append('\n')
+        elif content[index].isspace() and content[index] != '\n':
+            # All whitespace other than newline becomes space
+            result.append(' ')
+        else:
+            # Regular character
+            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, No semicolon to start a node, Key is not in uppercase, No delimiter after key, Missing closing bracket, Unmatched parenthesis, Escape character at end of string

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