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

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")
+    # Edge Case: Tree 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 its content (without outer parentheses).
+    Args:
+        content: The content of the tree without outer parentheses
+    Returns:
+        SgfTree: The parsed tree
+    """
+    # Edge Case: Content is just ';'
+    if content == ';':
+        return SgfTree()
+    # Find the first node
+    if not content.startswith(';'):
+        raise ValueError("tree missing")
+    # Parse the first node
+    node_end = 1  # Start after the ';'
+    properties = {}
+    # Parse properties of the first node
+    while node_end < len(content) and content[node_end] != '(' and content[node_end] != ';':
+        # Parse key
+        key_start = node_end
+        while node_end < len(content) and content[node_end].isalpha():
+            node_end += 1
+        # Edge Case: Property key is not in uppercase
+        key = content[key_start:node_end]
+        if not key.isupper():
+            raise ValueError("property must be in uppercase")
+        # Edge Case: No properties
+        if not key:
+            raise ValueError("properties without delimiter")
+        # Parse values
+        values = []
+        while node_end < len(content) and content[node_end] == '[':
+            node_end += 1  # Skip '['
+            value_start = node_end
+            # Parse value, handling escapes
+            while node_end < len(content) and content[node_end] != ']':
+                if content[node_end] == '\\':
+                    node_end += 2  # Skip escape and next character
+                else:
+                    node_end += 1
+            # Edge Case: Unclosed bracket
+            if node_end >= len(content) or content[node_end] != ']':
+                raise ValueError("properties without delimiter")
+            value = content[value_start:node_end]
+            # Process the value according to SGF text type rules
+            value = _process_text(value)
+            values.append(value)
+            node_end += 1  # Skip ']'
+        # Edge Case: No values for a property
+        if not values:
+            raise ValueError("properties without delimiter")
+        properties[key] = values
+    children = []
+    # Parse children
+    while node_end < len(content) and content[node_end] == '(':
+        # Find matching parenthesis
+        paren_count = 1
+        child_start = node_end
+        node_end += 1
+        while node_end < len(content) and paren_count > 0:
+            if content[node_end] == '(':
+                paren_count += 1
+            elif content[node_end] == ')':
+                paren_count -= 1
+            node_end += 1
+        # Edge Case: Mismatched parentheses
+        if paren_count != 0:
+            raise ValueError("tree missing")
+        # Parse child tree
+        child_content = content[child_start:node_end]
+        child_tree = parse(child_content)  # This will add the parentheses back
+        children.append(child_tree)
+    # Handle sequence nodes (nodes that start with ';')
+    if node_end < len(content) and content[node_end] == ';':
+        # Parse the rest as a child
+        rest_content = content[node_end:]
+        child_tree = _parse_tree(rest_content)
+        children.append(child_tree)
+    return SgfTree(properties, children)
+def _process_text(text: str) -> str:
+    """
+    Process text according to SGF text type rules.
+    Args:
+        text: The raw text value from SGF
+    Returns:
+        str: The processed text
+    """
+    result = []
+    i = 0
+    while i < len(text):
+        if text[i] == '\\':
+            # Check if next character exists
+            if i + 1 < len(text):
+                next_char = text[i+1]
+                # If next character is newline, remove both
+                if next_char == '\n':
+                    i += 2  # Skip backslash and newline
+                else:
+                    # Any non-whitespace character after \ is inserted as-is
+                    # Any whitespace character after \ is converted to space
+                    if next_char.isspace():
+                        result.append(' ')
+                    else:
+                        result.append(next_char)
+                    i += 2
+            else:
+                # Edge Case: Escape at end of string
+                i += 1
+        else:
+            char = text[i]
+            # 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, Input doesn't start with '(', Input doesn't end with ')', Empty tree with no nodes, Tree doesn't start with ';', Content is just ';', Property key is not in uppercase, No properties, Unclosed bracket, No values for a property, Mismatched parentheses, Escape at end of string

unicode

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Passed