joseph

Finished
2626
2727
2828def parse(input_string: str) -> SgfTree:
29 pass
29 if not input_string:
30 # Edge Case: Empty input string
31 raise ValueError("tree missing")
32
33 if not input_string.startswith('(') or not input_string.endswith(')'):
34 # Edge Case: Input does not start with '(' or end with ')'
35 raise ValueError("tree missing")
36
37 # Remove the outer parentheses
38 content = input_string[1:-1]
39
40 if not content:
41 # Edge Case: Empty tree with no nodes
42 raise ValueError("tree with no nodes")
43
44 # Parse the tree
45 tree, remaining = _parse_tree(content)
46
47 if remaining:
48 # Edge Case: Unexpected content after parsing the tree
49 raise ValueError("tree missing")
50
51 return tree
52
53
54def _parse_tree(content: str) -> tuple[SgfTree, str]:
55 if not content.startswith(';'):
56 # Edge Case: Node must start with ';'
57 raise ValueError("tree missing")
58
59 # Parse the first node
60 node, remaining = _parse_node(content[1:]) # Skip the ';'
61
62 children = []
63
64 # Parse any children - both variations (in parentheses) and single-child sequences
65 while remaining:
66 if remaining.startswith('('):
67 # Find the matching parenthesis for the child tree
68 balance = 1
69 index = 1 # Start after the initial '('
70 while index < len(remaining) and balance > 0:
71 if remaining[index] == '(':
72 balance += 1
73 elif remaining[index] == ')':
74 balance -= 1
75 index += 1
76
77 if balance != 0:
78 # Edge Case: Mismatched parentheses
79 raise ValueError("tree missing")
80
81 # Parse the child tree
82 child_content = remaining[1:index-1] # Exclude the outer parentheses
83 child_tree, child_remaining = _parse_tree(child_content)
84
85 if child_remaining:
86 # Edge Case: Unexpected content in child tree
87 raise ValueError("tree missing")
88
89 children.append(child_tree)
90 remaining = remaining[index:] # Move past the parsed child
91 elif remaining.startswith(';'):
92 # Single-child sequence
93 child_node, child_remaining = _parse_node(remaining[1:]) # Skip the ';'
94 child_tree = SgfTree(properties=child_node, children=[])
95 children.append(child_tree)
96 remaining = child_remaining
97 else:
98 # Unexpected content
99 break
100
101 return SgfTree(properties=node, children=children), remaining
102
103
104def _parse_node(content: str) -> tuple[dict, str]:
105 properties = {}
106 remaining = content
107
108 while remaining and remaining[0] != ')' and remaining[0] != '(':
109 # Parse a property
110 prop, remaining = _parse_property(remaining)
111 key, values = prop
112
113 if key in properties:
114 # Edge Case: Duplicate property key - accumulate values
115 properties[key].extend(values)
116 else:
117 properties[key] = values
118
119 return properties, remaining
120
121
122def _parse_property(content: str) -> tuple[tuple[str, list[str]], str]:
123 # Debug print
124 print(f"_parse_property called with content: {repr(content)}")
125
126 # Parse the key
127 key_end = 0
128 while key_end < len(content) and content[key_end].isalpha():
129 key_end += 1
130
131 if key_end == 0:
132 # Edge Case: Property key is missing
133 print(f"Property key is missing in content: {repr(content)}")
134 raise ValueError("properties without delimiter")
135
136 key = content[:key_end]
137
138 if not key.isupper():
139 # Edge Case: Property key is not in uppercase
140 raise ValueError("property must be in uppercase")
141
142 remaining = content[key_end:]
143
144 if not remaining.startswith('['):
145 # Edge Case: Property value delimiter '[' is missing
146 raise ValueError("properties without delimiter")
147
148 # Parse the values
149 values = []
150 remaining = remaining[1:] # Skip the '['
151
152 while True:
153 # Parse a single value
154 value, remaining = _parse_value(remaining)
155 values.append(value)
156
157 if not remaining.startswith(']'):
158 # Edge Case: Property value delimiter ']' is missing
159 raise ValueError("properties without delimiter")
160
161 remaining = remaining[1:] # Skip the ']'
162
163 # Check if there are more values for this property
164 if not remaining.startswith('['):
165 break
166
167 remaining = remaining[1:] # Skip the '['
168
169 return (key, values), remaining
170
171
172def _parse_value(content: str) -> tuple[str, str]:
173 value = []
174 i = 0
175
176 while i < len(content):
177 char = content[i]
178
179 if char == '\\':
180 # Handle escape sequences
181 i += 1
182 if i >= len(content):
183 # Edge Case: Escape character at end of value
184 raise ValueError("properties without delimiter")
185
186 next_char = content[i]
187
188 # According to SGF spec:
189 # - Any non-whitespace character after \ is inserted as-is
190 # - Any whitespace character after \ follows the normal rules
191 if next_char in ' \t\r\n':
192 # Whitespace after escape - follows normal whitespace rules
193 if next_char == '\n' and i > 0 and content[i-1] == '\\':
194 # Newline immediately after \ should be removed
195 pass
196 else:
197 # Apply normal whitespace rules
198 if next_char in ' \t\r':
199 value.append(' ')
200 else: # newline
201 value.append(next_char)
202 else:
203 # Any non-whitespace character after \ is inserted as-is
204 value.append(next_char)
205 elif char == ']':
206 # End of value
207 break
208 elif char in ' \t\r':
209 # Convert whitespace (except newline) to space
210 value.append(' ')
211 elif char == '\n':
212 # Newlines are kept unless immediately after \
213 value.append(char)
214 else:
215 # Regular character
216 value.append(char)
217
218 i += 1
219
220 if i >= len(content):
221 # Edge Case: End of content reached without finding ']'
222 raise ValueError("properties without delimiter")
223
224 return ''.join(value), content[i:]
225
226# Handled Edge Cases: Empty input string, Input does not start with '(' or end with ')', Empty tree with no nodes, Unexpected content after parsing the tree, Node must start with ';', Mismatched parentheses, Unexpected content in child tree, Duplicate property key, Property key is missing, Property key is not in uppercase, Property value delimiter '[' is missing, Property value delimiter ']' is missing, Escape character at end of value, End of content reached without finding ']'
Test NameStatus
test_opening_bracket_within_property_value_doesn_t_need_to_be_escaped
Fail
test_parentheses_in_property_value_don_t_need_to_be_escaped
Fail
test_semicolon_in_property_value_doesn_t_need_to_be_escaped
Fail
test_two_nodes
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_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_properties_without_delimiter
Pass
test_single_node_tree
Pass
test_tree_with_no_nodes
Pass
test_two_child_trees
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

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