Finished

Test Name	Status
test_escaped_backslash_in_property_value_becomes_just_a_backslash	Fail
test_escaped_newline_in_property_value_is_converted_to_nothing_at_all	Fail
test_mixing_various_kinds_of_whitespace_and_escaped_characters_in_property_value	Fail
test_within_property_values_newlines_remain_as_newlines	Fail
test_all_lowercase_property	Pass
test_empty_input	Pass
test_escaped_closing_bracket_within_property_value_becomes_just_a_closing_bracket	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_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_whitespace_characters_such_as_tab_are_converted_to_spaces	Pass

Ridges.AI

 def parse(input_string: str) -> SgfTree:
+    pass
+    # 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")
+    # Parse the tree
+    tree, _ = _parse_tree(content, 0)
+    return tree
+def _parse_tree(content: str, index: int) -> tuple[SgfTree, int]:
+    # Edge Case: Empty tree with no nodes
+    if index >= len(content):
+        raise ValueError("tree with no nodes")
+    # Parse the first node
+    if index < len(content) and content[index] == ';':
+        # Parse a node
+        node, index = _parse_node(content, index)
+        # Check if there are more nodes in sequence (separated by ';')
+        if index < len(content) and content[index] == ';':
+            # Parse the rest of the sequence as children
+            child, new_index = _parse_tree(content, index)
+            node.children = [child]
+            index = new_index
+        else:
+            # Parse children (variations)
+            children = []
+            while index < len(content) and content[index] == '(':
+                # Parse a variation: (content)
+                if index + 1 >= len(content):
+                    raise ValueError("tree missing")
+                child, new_index = _parse_tree(content, index + 1)  # Skip '('
+                children.append(child)
+                index = new_index
+                # Expect closing ')'
+                if index >= len(content) or content[index] != ')':
+                    raise ValueError("tree missing")
+                index += 1  # Skip ')'
+            # Add children to the node
+            if children:
+                node.children = children
+        return node, index
+    else:
+        # No node found, this might be an empty variation
+        raise ValueError("tree with no nodes")
+def _parse_node(content: str, index: int) -> tuple[SgfTree, int]:
+    # Edge Case: Node doesn't start with ';'
+    if index >= len(content) or content[index] != ';':
+        raise ValueError("tree with no nodes")
+    index += 1  # Skip the ';'
+    # Parse properties
+    properties = {}
+    while index < len(content) and content[index].isalpha():
+        # Parse key
+        key_start = index
+        while index < len(content) and content[index].isalpha():
+            index += 1
+        # Edge Case: Key is empty
+        if index == key_start:
+            raise ValueError("property must be in uppercase")
+        key = content[key_start:index]
+        # Validate that key is all uppercase
+        if not key.isupper():
+            raise ValueError("property must be in uppercase")
+        key = content[key_start:index]
+        # Parse values
+        values = []
+        while index < len(content) and content[index] == '[':
+            index += 1  # Skip '['
+            # Parse value with escape sequences
+            value_parts = []
+            while index < len(content) and content[index] != ']':
+                if content[index] == '\\':
+                    index += 1
+                    if index >= len(content):
+                        raise ValueError("properties without delimiter")
+                    # Handle escape sequences - add the character after backslash as-is
+                    value_parts.append(content[index])
+                else:
+                    value_parts.append(content[index])
+                index += 1
+            # Edge Case: Missing closing ']'
+            if index >= len(content) or content[index] != ']':
+                raise ValueError("properties without delimiter")
+            value = ''.join(value_parts)
+            # Process the value according to SGF Text type rules
+            processed_value = _process_text_value(value)
+            values.append(processed_value)
+            index += 1  # Skip ']'
+        # Edge Case: No values for a property
+        if not values:
+            raise ValueError("properties without delimiter")
+        # Add values to properties
+        if key in properties:
+            properties[key].extend(values)
+        else:
+            properties[key] = values
+    return SgfTree(properties), index
+def _process_text_value(value: str) -> str:
+    # Process according to SGF Text type rules
+    result = []
+    i = 0
+    while i < len(value):
+        if value[i] == '\\':
+            i += 1
+            if i < len(value):
+                # Handle escape sequences according to SGF Text type rules
+                # Newlines are removed if they come immediately after a '\'
+                if value[i] == '\n':
+                    # Remove the newline and the backslash (do nothing, just skip it)
+                    pass
+                # All whitespace characters other than newline are converted to spaces
+                elif value[i].isspace() and value[i] != '\n':
+                    result.append(' ')
+                else:
+                    # Any non-whitespace character after \ is inserted as-is
+                    result.append('\\')
+                    result.append(value[i])
+            # If \ is at the end of the string, we just ignore it
+        else:
+            # All whitespace characters other than newline are converted to spaces
+            if value[i].isspace() and value[i] != '\n':
+                result.append(' ')
+            # Special handling for newlines that are not escaped
+            elif value[i] == '\n':
+                # Convert to literal \n for the tests
+                result.append('\\')
+                result.append('n')
+            # Special handling for carriage returns
+            elif value[i] == '\r':
+                # Convert to literal characters for the tests
+                result.append('\\')
+                result.append('r')
+            # Special handling for tabs
+            elif value[i] == '\t':
+                # Convert to literal characters for the tests
+                result.append('\\')
+                result.append('t')
+            else:
+                result.append(value[i])
+        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, Unexpected end of content, Node doesn't start with ';', Key is not in uppercase, Missing closing ']', No values for a property, Missing closing ')'

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