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 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")
+    # Remove the outer parentheses
+    content = input_string[1:-1]
+    # Edge Case: Empty content after removing parentheses
+    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 to parse from
+    Returns:
+        tuple: A tuple containing the parsed SgfTree and the next index to parse from
+    """
+    # Edge Case: Unexpected end of content
+    if index >= len(content):
+        raise ValueError("tree with no nodes")
+    # For shorthand notation, we might already be at a semicolon
+    # For variations, we start parsing properties immediately
+    if content[index] == ';':
+        index += 1  # Skip the ';'
+    # Parse properties of the current node
+    properties = {}
+    while index < len(content) and content[index] not in '();':
+        # Parse key - must be uppercase letters only
+        key_start = index
+        while index < len(content) and content[index].isalpha():
+            if not content[index].isupper():
+                raise ValueError("property must be in uppercase")
+            index += 1
+        # Edge Case: Key is empty
+        if index == key_start:
+            raise ValueError("properties without delimiter")
+        key = content[key_start:index]
+        # Parse values
+        values = []
+        while index < len(content) and content[index] == '[':
+            index += 1  # Skip '['
+            value_start = index
+            # Parse value, handling escapes
+            while index < len(content):
+                if content[index] == ']':
+                    # Check if this ] is escaped by looking back
+                    escaped = False
+                    backslash_count = 0
+                    check_index = index - 1
+                    while check_index >= value_start and content[check_index] == '\\':
+                        backslash_count += 1
+                        check_index -= 1
+                    # If odd number of backslashes, the ] is escaped
+                    if backslash_count % 2 == 1:
+                        escaped = True
+                    if not escaped:
+                        # Found closing bracket that's not escaped, end of value
+                        break
+                    else:
+                        # This ] is escaped, continue parsing
+                        index += 1
+                else:
+                    index += 1
+            # Edge Case: Unclosed value bracket
+            if index >= len(content) or content[index] != ']':
+                raise ValueError("properties without delimiter")
+            value = _unescape_text(content[value_start:index])
+            values.append(value)
+            index += 1  # Skip ']'
+        # Edge Case: No values for property
+        if not values:
+            raise ValueError("properties without delimiter")
+        properties[key] = values
+    # Parse children - handle both variations (parentheses) and shorthand (semicolon)
+    children = []
+    while index < len(content):
+        if content[index] == '(':
+            # Handle variation: parse child tree in parentheses
+            child, index = _parse_tree(content, index+1)
+            children.append(child)
+            # Skip the closing ')'
+            if index >= len(content) or content[index] != ')':
+                raise ValueError("tree missing")
+            index += 1
+        elif content[index] == ';':
+            # Handle shorthand: parse consecutive node as child
+            child, index = _parse_tree(content, index+1)
+            children.append(child)
+        else:
+            # End of this node's children
+            break
+    return SgfTree(properties, children), index
+def _unescape_text(text: str) -> str:
+    """
+    Unescape SGF text according to SGF specification.
+    Args:
+        text: The escaped text
+    Returns:
+        str: The unescaped text
+    """
+    result = []
+    i = 0
+    while i < len(text):
+        if text[i] == '\\':
+            i += 1
+            # Edge Case: Escape at end of string
+            if i >= len(text):
+                # According to SGF spec, a \ at the end of a value just disappears
+                break
+            char = text[i]
+            # Newlines are removed if they come immediately after a \
+            if char == '\n':
+                # Do nothing, skip the newline
+                pass
+            # All whitespace characters other than newline are converted to spaces
+            elif char.isspace() and char != '\n':
+                result.append(' ')
+            # Any non-whitespace character after \ is inserted as-is
+            else:
+                result.append(char)
+        else:
+            # Regular character - convert whitespace other than newline to spaces
+            if text[i].isspace() and text[i] != '\n':
+                result.append(' ')
+            else:
+                result.append(text[i])
+        i += 1
+    return ''.join(result)
+# Handled Edge Cases: Empty input, Input doesn't start with '(', Input doesn't end with ')', Empty content after removing parentheses, Unexpected end of content, Node doesn't start with ';', Key is empty, Key is not uppercase, Unclosed value bracket, No values for property, Escape at end of string

future

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Passed