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_escaped_tab_in_property_value_is_converted_to_space	Fail
test_mixing_various_kinds_of_whitespace_and_escaped_characters_in_property_value	Fail
test_multiple_properties	Fail
test_multiple_property_values	Fail
test_opening_bracket_within_property_value_doesn_t_need_to_be_escaped	Fail
test_parentheses_in_property_value_don_t_need_to_be_escaped	Fail
test_semicolon_in_property_value_doesn_t_need_to_be_escaped	Fail
test_single_node_tree	Fail
test_two_child_trees	Fail
test_two_nodes	Fail
test_within_property_values_newlines_remain_as_newlines	Fail
test_within_property_values_whitespace_characters_such_as_tab_are_converted_to_spaces	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_node_without_properties	Pass
test_node_without_tree	Pass
test_properties_without_delimiter	Pass
test_tree_with_no_nodes	Pass
test_upper_and_lowercase_property	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 malformed or doesn't follow 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")
+    # Parse the tree, starting after the initial '('
+    tree, pos = _parse_tree(input_string, 1)
+    # Edge Case: Parser didn't consume the entire string
+    if pos != len(input_string) - 1:  # -1 because we expect the final ')'
+        raise ValueError("tree missing")
+    return tree
+def _parse_tree(s: str, pos: int) -> tuple[SgfTree, int]:
+    """
+    Parse a tree from the SGF string starting at position pos.
+    Args:
+        s: The SGF string
+        pos: The starting position in the string
+    Returns:
+        tuple: (SgfTree, new position)
+    """
+    # Edge Case: No semicolon after opening parenthesis
+    if pos >= len(s) or s[pos] != ';':
+        raise ValueError("tree with no nodes")
+    pos += 1  # Skip the ';'
+    # Parse the node properties
+    properties = {}
+    while pos < len(s) and s[pos].isalpha():
+        key, values, pos = _parse_property(s, pos)
+        # Edge Case: Property key is not uppercase
+        if not key.isupper():
+            raise ValueError("property must be in uppercase")
+        properties[key] = values
+    # Parse children - handle both sequential nodes and variations
+    children = []
+    # First handle sequential nodes (separated by semicolons)
+    if pos < len(s) and s[pos] == ';':
+        # This is a sequential node, create a chain
+        child, pos = _parse_tree(s, pos)  # Don't skip the ';' as _parse_tree expects it
+        children.append(child)
+    # Then handle variations (nodes in parentheses)
+    while pos < len(s) and s[pos] == '(':
+        child, pos = _parse_tree(s, pos + 1)  # Skip the '('
+        children.append(child)
+        # Skip the closing ')'
+        if pos < len(s) and s[pos] == ')':
+            pos += 1
+        else:
+            raise ValueError("tree missing")
+    return SgfTree(properties, children), pos
+def _parse_property(s: str, pos: int) -> tuple[str, list[str], int]:
+    """
+    Parse a property (key with one or more values) from the SGF string.
+    Args:
+        s: The SGF string
+        pos: The starting position in the string
+    Returns:
+        tuple: (key, list of values, new position)
+    """
+    # Parse the key
+    key_start = pos
+    while pos < len(s) and s[pos].isalpha():
+        pos += 1
+    # Edge Case: No key found
+    if pos == key_start:
+        raise ValueError("properties without delimiter")
+    key = s[key_start:pos]
+    # Edge Case: No values after key
+    if pos >= len(s) or s[pos] != '[':
+        raise ValueError("properties without delimiter")
+    # Parse values
+    values = []
+    while pos < len(s) and s[pos] == '[':
+        pos += 1  # Skip the '['
+        # Parse the value, handling escapes
+        value_chars = []
+        while pos < len(s):
+            if s[pos] == '\\':
+                pos += 1
+                if pos < len(s):
+                    # Handle escaped characters according to SGF text rules
+                    char = s[pos]
+                    if char == '\n':
+                        # Newlines immediately after \ are removed
+                        pass  # Don't add anything to value_chars
+                    else:
+                        # Any other character after \ is inserted as-is
+                        value_chars.append(char)
+                    pos += 1  # Increment position after handling escaped character
+                else:
+                    # Edge Case: Escape at end of string
+                    raise ValueError("properties without delimiter")
+            elif s[pos] == ']':
+                # End of value
+                break
+            elif s[pos].isalpha():
+                # Start of new property - end current value
+                break
+            else:
+                value_chars.append(s[pos])
+                pos += 1
+        # Check if we ended value parsing due to finding start of new property
+        # If so, we don't expect a closing bracket at current position
+        if not (pos < len(s) and s[pos].isalpha()):
+            # Edge Case: Unclosed bracket
+            if pos >= len(s) or s[pos] != ']':
+                raise ValueError("properties without delimiter")
+        # If we did end due to new property, we skip the bracket check
+        # Process the value according to SGF text rules
+        value = _process_text_value(''.join(value_chars))
+        values.append(value)
+        # Only skip closing bracket if we actually found one
+        if pos < len(s) and s[pos] == ']':
+            pos += 1  # Skip the ']'
+        # If we ended due to new property, we don't skip anything
+    return key, values, pos
+def _process_text_value(value: str) -> str:
+    """
+    Process a text value according to SGF text type rules.
+    Args:
+        value: The raw text value (after escape processing)
+    Returns:
+        str: The processed text value
+    """
+    result = []
+    i = 0
+    while i < len(value):
+        char = value[i]
+        if char in ' \t\r':
+            # All whitespace characters other than newline are converted to spaces
+            result.append(' ')
+        elif char == '\n':
+            # Newlines remain as newlines
+            result.append(char)
+        else:
+            result.append(char)
+        i += 1
+    return ''.join(result)
+# Handled Edge Cases: Empty input, Input doesn't start with '(', Input doesn't end with ')', No semicolon after opening parenthesis, Property key is not uppercase, No key found, No values after key, Unclosed bracket, Escape at end of string, Parser didn't consume the entire string
+# Handled Edge Cases: Property key is not uppercase, No key found, No values after key, Unclosed bracket
+# Handled Edge Cases: Escape at end of string

xas

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