| 26 | 26 | |
| 27 | 27 | |
| 28 | 28 | def parse(input_string: str) -> SgfTree: |
| 29 | pass | |
| 29 | if not input_string: | |
| 30 | raise ValueError("tree missing") | |
| 31 | ||
| 32 | if not input_string.startswith('(') or not input_string.endswith(')'): | |
| 33 | raise ValueError("tree missing") | |
| 34 | ||
| 35 | # Remove the outer parentheses | |
| 36 | content = input_string[1:-1] | |
| 37 | ||
| 38 | if not content: | |
| 39 | raise ValueError("tree with no nodes") | |
| 40 | ||
| 41 | # Parse the first node | |
| 42 | node_end = find_node_end(content) | |
| 43 | first_node = content[:node_end] | |
| 44 | rest = content[node_end:] | |
| 45 | ||
| 46 | properties = parse_properties(first_node) | |
| 47 | children = [] | |
| 48 | ||
| 49 | # Parse children | |
| 50 | while rest: | |
| 51 | if rest.startswith('('): | |
| 52 | # Find the matching closing parenthesis | |
| 53 | paren_count = 0 | |
| 54 | found_closing = False | |
| 55 | for i, char in enumerate(rest): | |
| 56 | if char == '(': | |
| 57 | paren_count += 1 | |
| 58 | elif char == ')': | |
| 59 | paren_count -= 1 | |
| 60 | if paren_count == 0: | |
| 61 | subtree_str = rest[:i+1] | |
| 62 | rest = rest[i+1:] | |
| 63 | children.append(parse(subtree_str)) | |
| 64 | found_closing = True | |
| 65 | break | |
| 66 | if not found_closing: | |
| 67 | raise ValueError("tree missing") | |
| 68 | else: | |
| 69 | raise ValueError("tree missing") | |
| 70 | ||
| 71 | return SgfTree(properties, children) | |
| 72 | ||
| 73 | ||
| 74 | def find_node_end(content): | |
| 75 | """Find the end of the first node in the content.""" | |
| 76 | i = 0 | |
| 77 | max_iterations = len(content) # Prevent infinite loop | |
| 78 | iteration_count = 0 | |
| 79 | ||
| 80 | while i < len(content) and iteration_count < max_iterations: | |
| 81 | iteration_count += 1 | |
| 82 | if content[i] == '[': | |
| 83 | # Skip to the matching closing bracket | |
| 84 | bracket_count = 1 | |
| 85 | i += 1 | |
| 86 | inner_iterations = 0 | |
| 87 | max_inner_iterations = len(content) - i | |
| 88 | ||
| 89 | while i < len(content) and bracket_count > 0 and inner_iterations < max_inner_iterations: | |
| 90 | inner_iterations += 1 | |
| 91 | if content[i] == '\\': | |
| 92 | i += 2 # Skip escaped character | |
| 93 | elif content[i] == '[': | |
| 94 | bracket_count += 1 | |
| 95 | i += 1 | |
| 96 | elif content[i] == ']': | |
| 97 | bracket_count -= 1 | |
| 98 | i += 1 | |
| 99 | else: | |
| 100 | i += 1 | |
| 101 | ||
| 102 | # If we didn't close all brackets, we have an error | |
| 103 | if bracket_count > 0: | |
| 104 | return len(content) # Return end to trigger error handling | |
| 105 | elif content[i] == '(': | |
| 106 | # This is the start of a child node | |
| 107 | return i | |
| 108 | else: | |
| 109 | i += 1 | |
| 110 | return i | |
| 111 | ||
| 112 | ||
| 113 | def parse_properties(node_content): | |
| 114 | """Parse properties from a node content string.""" | |
| 115 | properties = {} | |
| 116 | ||
| 117 | if not node_content: | |
| 118 | return properties | |
| 119 | ||
| 120 | i = 0 | |
| 121 | max_iterations = len(node_content) # Prevent infinite loop | |
| 122 | iteration_count = 0 | |
| 123 | ||
| 124 | while i < len(node_content) and iteration_count < max_iterations: | |
| 125 | iteration_count += 1 | |
| 126 | # Parse key | |
| 127 | if not node_content[i].isalpha() or not node_content[i].isupper(): | |
| 128 | raise ValueError("property must be in uppercase") | |
| 129 | ||
| 130 | key_start = i | |
| 131 | while i < len(node_content) and node_content[i].isalpha(): | |
| 132 | i += 1 | |
| 133 | ||
| 134 | key = node_content[key_start:i] | |
| 135 | ||
| 136 | if not key.isupper(): | |
| 137 | raise ValueError("property must be in uppercase") | |
| 138 | ||
| 139 | # Parse values | |
| 140 | values = [] | |
| 141 | value_iterations = 0 | |
| 142 | max_value_iterations = len(node_content) - i | |
| 143 | ||
| 144 | while i < len(node_content) and node_content[i] == '[' and value_iterations < max_value_iterations: | |
| 145 | value_iterations += 1 | |
| 146 | i += 1 # Skip opening bracket | |
| 147 | value_start = i | |
| 148 | ||
| 149 | # Find the matching closing bracket | |
| 150 | bracket_count = 1 | |
| 151 | inner_iterations = 0 | |
| 152 | max_inner_iterations = len(node_content) - i | |
| 153 | ||
| 154 | while i < len(node_content) and inner_iterations < max_inner_iterations: | |
| 155 | inner_iterations += 1 | |
| 156 | if node_content[i] == '\\': | |
| 157 | i += 2 # Skip escaped character | |
| 158 | elif node_content[i] == '[': | |
| 159 | bracket_count += 1 | |
| 160 | i += 1 | |
| 161 | elif node_content[i] == ']': | |
| 162 | bracket_count -= 1 | |
| 163 | if bracket_count == 0: | |
| 164 | break | |
| 165 | else: | |
| 166 | i += 1 | |
| 167 | else: | |
| 168 | i += 1 | |
| 169 | ||
| 170 | if bracket_count != 0: | |
| 171 | raise ValueError("properties without delimiter") | |
| 172 | ||
| 173 | value = node_content[value_start:i] | |
| 174 | values.append(parse_text(value)) | |
| 175 | i += 1 # Skip closing bracket | |
| 176 | ||
| 177 | properties[key] = values | |
| 178 | ||
| 179 | # Check if we exited due to iteration limit | |
| 180 | if iteration_count >= max_iterations and i < len(node_content): | |
| 181 | raise ValueError("malformed property") | |
| 182 | ||
| 183 | return properties | |
| 184 | ||
| 185 | ||
| 186 | def parse_text(text): | |
| 187 | """Parse SGF Text type according to specifications.""" | |
| 188 | result = [] | |
| 189 | i = 0 | |
| 190 | max_iterations = len(text) # Prevent infinite loop | |
| 191 | iteration_count = 0 | |
| 192 | ||
| 193 | while i < len(text) and iteration_count < max_iterations: | |
| 194 | iteration_count += 1 | |
| 195 | if text[i] == '\\': | |
| 196 | # Handle escape sequence | |
| 197 | i += 1 | |
| 198 | if i < len(text): | |
| 199 | char = text[i] | |
| 200 | if char == 'n': | |
| 201 | result.append('\n') | |
| 202 | elif char == 't': | |
| 203 | result.append('\t') | |
| 204 | elif char == 'r': | |
| 205 | result.append('\r') | |
| 206 | elif char.isspace(): | |
| 207 | # Whitespace after \ is handled according to rules | |
| 208 | if char == '\n': | |
| 209 | # Newlines are removed if they come immediately after \ | |
| 210 | pass | |
| 211 | else: | |
| 212 | result.append(' ') | |
| 213 | else: | |
| 214 | result.append(char) | |
| 215 | i += 1 | |
| 216 | else: | |
| 217 | # Trailing backslash | |
| 218 | result.append('\\') | |
| 219 | else: | |
| 220 | char = text[i] | |
| 221 | if char == '\n': | |
| 222 | result.append('\n') | |
| 223 | elif char.isspace(): | |
| 224 | result.append(' ') | |
| 225 | else: | |
| 226 | result.append(char) | |
| 227 | i += 1 | |
| 228 | ||
| 229 | return ''.join(result) | |
| 230 | ||
| 231 | # Handled Edge Cases: empty input, missing parentheses, no nodes, property not uppercase, missing delimiters |
| Test Name | Status |
|---|---|
test_escaped_backslash_in_property_value_becomes_just_a_backslash | Fail |
test_all_lowercase_property | Pass |
test_empty_input | Pass |
test_escaped_closing_bracket_within_property_value_becomes_just_a_closing_bracket | Skip |
test_escaped_newline_in_property_value_is_converted_to_nothing_at_all | Skip |
test_escaped_t_and_n_in_property_value_are_just_letters_not_whitespace | Skip |
test_escaped_tab_in_property_value_is_converted_to_space | Skip |
test_mixing_various_kinds_of_whitespace_and_escaped_characters_in_property_value | Skip |
test_multiple_properties | Skip |
test_multiple_property_values | Skip |
test_node_without_properties | Skip |
test_node_without_tree | Skip |
test_opening_bracket_within_property_value_doesn_t_need_to_be_escaped | Skip |
test_parentheses_in_property_value_don_t_need_to_be_escaped | Skip |
test_properties_without_delimiter | Skip |
test_semicolon_in_property_value_doesn_t_need_to_be_escaped | Skip |
test_single_node_tree | Skip |
test_tree_with_no_nodes | Skip |
test_two_child_trees | Skip |
test_two_nodes | Skip |
test_upper_and_lowercase_property | Skip |
test_within_property_values_newlines_remain_as_newlines | Skip |
test_within_property_values_whitespace_characters_such_as_tab_are_converted_to_spaces | Skip |
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