Finished

Test Name	Status
test_all_lowercase_property	Fail
test_escaped_closing_bracket_within_property_value_becomes_just_a_closing_bracket	Fail
test_escaped_t_and_n_in_property_value_are_just_letters_not_whitespace	Fail
test_escaped_tab_in_property_value_is_converted_to_space	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_tree_with_no_nodes	Fail
test_upper_and_lowercase_property	Fail
test_empty_input	Pass
test_escaped_backslash_in_property_value_becomes_just_a_backslash	Pass
test_escaped_newline_in_property_value_is_converted_to_nothing_at_all	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_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 that doesn't start with '('
+    if not input_string.startswith('('):
+        raise ValueError("tree missing")
+    # Edge Case: Input that 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 content after removing parentheses (like "()")
+    if not content:
+        raise ValueError("tree missing")
+    # Parse the tree
+    tree, _ = _parse_node_sequence(content, 0)
+    return tree
+def _parse_node(content: str, index: int) -> tuple[SgfTree, int]:
+    """
+    Parse a single node from the content string starting at index.
+    Args:
+        content: The SGF content string
+        index: The starting index for parsing (should be at ';')
+    Returns:
+        tuple: A tuple containing the parsed SgfTree and the next index to parse
+    """
+    # Edge Case: Content doesn't start with ';'
+    if index >= len(content) or content[index] != ';':
+        raise ValueError("tree with no nodes")
+    index += 1  # Skip the ';'
+    # Parse properties for this node
+    properties = {}
+    while index < len(content) and content[index].isalpha() and content[index].isupper():
+        # Parse key
+        key_start = index
+        while index < len(content) and content[index].isalpha() and content[index].isupper():
+            index += 1
+        key = content[key_start:index]
+        # Edge Case: Key is not uppercase
+        if not key.isupper():
+            raise ValueError("property must be in uppercase")
+        # Parse values
+        values = []
+        while index < len(content) and content[index] == '[':
+            index += 1  # Skip '['
+            value_start = index
+            # Parse value (include all characters as-is)
+            while index < len(content) and content[index] != ']':
+                index += 1
+            # Edge Case: Unclosed bracket
+            if index >= len(content) or content[index] != ']':
+                raise ValueError("properties without delimiter")
+            value = content[value_start:index]
+            # Process the value according to SGF Text type rules
+            value = _process_text_value(value)
+            values.append(value)
+            index += 1  # Skip ']'
+        # Edge Case: No values for the property
+        if not values:
+            raise ValueError("properties without delimiter")
+        properties[key] = values
+    return SgfTree(properties), index
+def _parse_node_sequence(content: str, index: int) -> tuple[SgfTree, int]:
+    """
+    Parse a sequence of nodes, where the first node is the parent and subsequent nodes are children.
+    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
+    """
+    # Parse the first node
+    if index >= len(content):
+        # Handle empty content case
+        raise ValueError("tree with no nodes")
+    if content[index] != ';':
+        # Handle case like "()" which should raise "tree missing"
+        raise ValueError("tree missing")
+    first_node, index = _parse_node(content, index)
+    # Parse sequential nodes (using semicolons) as children
+    children = []
+    while index < len(content) and content[index] == ';':
+        child, index = _parse_node(content, index)
+        children.append(child)
+    # Parse variations (using parentheses) as additional children
+    while index < len(content) and content[index] == '(':
+        # For variations, we need to parse a complete subtree
+        subtree, new_index = _parse_node_sequence(content, index + 1)  # Skip '('
+        children.append(subtree)
+        index = new_index
+        # Skip ')'
+        if index >= len(content) or content[index] != ')':
+            raise ValueError("tree missing")
+        index += 1
+    # Attach children to the first node
+    if children:
+        first_node.children = children
+    return first_node, index
+def _process_text_value(value: str) -> str:
+    """
+    Process a text value according to SGF Text type rules.
+    Args:
+        value: The raw text value
+    Returns:
+        str: The processed text value
+    """
+    result = []
+    i = 0
+    while i < len(value):
+        if value[i] == '\\':
+            i += 1
+            if i < len(value):
+                # If next character is newline, remove the backslash and newline
+                if value[i] == '\n':
+                    i += 1
+                    continue
+                # Any character after \ should be preserved as-is (both backslash and character)
+                # Since we're already processing the escaped character, just append it
+                # The backslash was already consumed, so we just append the character
+                result.append(value[i])
+                i += 1
+            else:
+                # Edge Case: Escape at end of string
+                result.append('\\')
+        else:
+            # All whitespace characters other than newline are converted to spaces
+            if value[i].isspace() and value[i] != '\n':
+                result.append(' ')
+            else:
+                result.append(value[i])
+        i += 1
+    return ''.join(result)
+# Handled Edge Cases: Empty input, missing opening parenthesis, missing closing parenthesis, empty content after removing parentheses, content not starting with semicolon, empty or non-uppercase key, unclosed bracket, no values for property, missing closing parenthesis for children, escape at end of string

sn62

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