Finished

Test Name	Status
test_escaped_tab_in_property_value_is_converted_to_space	Fail
test_node_without_properties	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_t_and_n_in_property_value_are_just_letters_not_whitespace	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_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 or doesn't start with '('
+    if not input_string or not input_string.startswith('('):
+        raise ValueError("tree missing")
+    # Edge Case: 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")
+    # Edge Case: Doesn't start with ';'
+    if not content.startswith(';'):
+        raise ValueError("tree with no nodes")
+    return _parse_tree(content)
+def _parse_tree(content: str) -> SgfTree:
+    """
+    Parse a tree from content string.
+    Args:
+        content: Content string starting with ';'
+    Returns:
+        SgfTree: The parsed tree
+    """
+    # Skip the initial ';'
+    index = 1
+    # Parse properties
+    properties = {}
+    while index < len(content) and content[index] != '(' and content[index] != ')':
+        # If we encounter a semicolon, it means we're starting a new node
+        # This current node should become the parent of the new node(s)
+        if content[index] == ';':
+            break
+        # Parse key
+        key_start = index
+        while index < len(content) and content[index].isalpha():
+            index += 1
+        # Edge Case: No key found
+        if key_start == index:
+            break
+        # Edge Case: Key is not all uppercase
+        key = content[key_start:index]
+        if not key.isupper():
+            raise ValueError("property must be in uppercase")
+        # Edge Case: Key exists but has no values
+        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_start = index
+            # Parse value, handling escapes
+            while index < len(content) and content[index] != ']':
+                if content[index] == '\\':
+                    index += 2  # Skip escape and next character
+                else:
+                    index += 1
+            # Edge Case: Unclosed value bracket
+            if index >= len(content):
+                raise ValueError("properties without delimiter")
+            # Extract and process value
+            value = _process_text(content[value_start:index])
+            values.append(value)
+            index += 1  # Skip ']'
+        # Edge Case: No values found for key
+        if not values:
+            raise ValueError("properties without delimiter")
+        properties[key] = values
+    # Parse children
+    children = []
+    # First, check if we have a semicolon indicating a direct child node
+    if index < len(content) and content[index] == ';':
+        # Parse the rest of the content as a single child node
+        child_content = content[index:]
+        children.append(_parse_tree(child_content))
+    else:
+        # Parse variations in parentheses
+        while index < len(content) and content[index] == '(':
+            # Find matching parenthesis for this child
+            paren_count = 1
+            start = index
+            index += 1
+            while index < len(content) and paren_count > 0:
+                if content[index] == '(':
+                    paren_count += 1
+                elif content[index] == ')':
+                    paren_count -= 1
+                index += 1
+            # Edge Case: Mismatched parentheses
+            if paren_count != 0:
+                raise ValueError("tree missing")
+            # Parse the child tree
+            child_content = content[start+1:index-1]
+            children.append(_parse_tree(child_content))
+    # Edge Case: No properties and no children
+    if not properties and not children:
+        raise ValueError("tree with no nodes")
+    return SgfTree(properties, children)
+def _process_text(text: str) -> str:
+    """
+    Process SGF text according to SGF Text type rules.
+    Args:
+        text: Raw text from SGF property value
+    Returns:
+        str: Processed text
+    """
+    result = []
+    i = 0
+    while i < len(text):
+        if text[i] == '\\':
+            # Handle escape character
+            i += 1
+            if i < len(text):
+                # Check if next character is a newline
+                if text[i] == '\n':
+                    # Newline immediately after \ is removed
+                    i += 1
+                    continue
+                else:
+                    # Any character after \ is inserted as-is
+                    result.append(text[i])
+                    i += 1
+            else:
+                # Trailing backslash is just added
+                result.append('\\')
+        elif text[i] == '\n':
+            # Newline not preceded by \ is kept
+            result.append('\n')
+            i += 1
+        elif text[i] in (' ', '\t', '\r'):
+            # All whitespace other than newline becomes space
+            result.append(' ')
+            i += 1
+        else:
+            # All other characters added as-is
+            result.append(text[i])
+            i += 1
+    return ''.join(result)
+# Handled Edge Cases: Empty input, missing opening parenthesis, missing closing parenthesis, empty content after parentheses removal, missing semicolon, key not uppercase, missing delimiter for property values, unclosed value bracket, no values for key, mismatched parentheses
+# Handled Edge Cases: Escape character handling, newline handling, whitespace conversion

sn62

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