python

Finished
2626
2727
2828def 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
74def 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
113def 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
186def 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 NameStatus
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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