178     def __init__(self, string: str):  argument
179         self.input = string
180         self.cur = 0
182     def is_done(self) -> bool:  argument
183         return self.cur == len(self.input)
185     def consume_whitespace(self):  argument
186         while not self.is_done() and self.input[self.cur] in ' \t\n':
187             self.cur += 1
189     def parse(self):  argument
207         result = self._parse_allow_trailing()
208         self.consume_whitespace()
209         if not self.is_done():
211                               self.input[self.cur:])
214     def parse_args(self) -> dict:  argument
221         self.consume_whitespace()
222         while not self.is_done():
223             ident = self._parse_ident()
224             self.consume_whitespace()
225             if self.input[self.cur] != '=':
226                 raise GNException("Unexpected token: " + self.input[self.cur:])
227             self.cur += 1
228             self.consume_whitespace()
229             val = self._parse_allow_trailing()
230             self.consume_whitespace()
235     def parse_number(self) -> int:  argument
236         self.consume_whitespace()
237         if self.is_done():
240         begin = self.cur
243         if not self.is_done() and _is_digit_or_minus(self.input[self.cur]):
244             self.cur += 1
245         while not self.is_done() and self.input[self.cur].isdigit():
246             self.cur += 1
248         number_string = self.input[begin:self.cur]
253     def parse_string(self) -> str:  argument
254         self.consume_whitespace()
255         if self.is_done():
258         if self.input[self.cur] != '"':
260                               self.input[self.cur:])
261         self.cur += 1  # Skip over quote.
263         begin = self.cur
264         while not self.is_done() and self.input[self.cur] != '"':
265             if self.input[self.cur] == '\\':
266                 self.cur += 1  # Skip over the backslash.
267                 if self.is_done():
269                                       self.input)
270             self.cur += 1
272         if self.is_done():
273             raise GNException('Unterminated string:\n  ' + self.input[begin:])
275         end = self.cur
276         self.cur += 1  # Consume trailing ".
278         return unescape_gn_string(self.input[begin:end])
280     def parse_list(self):  argument
281         self.consume_whitespace()
282         if self.is_done():
286         if self.input[self.cur] != '[':
288                               self.input[self.cur:])
289         self.cur += 1
290         self.consume_whitespace()
291         if self.is_done():
292             raise GNException("Unterminated list:\n  " + self.input)
296         while not self.is_done():
297             if self.input[self.cur] == ']':
298                 self.cur += 1  # Skip over ']'.
304             list_result += [self._parse_allow_trailing()]
305             self.consume_whitespace()
306             if self.is_done():
310             previous_had_trailing_comma = self.input[self.cur] == ','
313                 self.cur += 1
314                 self.consume_whitespace()
316         raise GNException("Unterminated list:\n  " + self.input)
318     def _constant_follows(self, constant) -> bool:  argument
323         end = self.cur + len(constant)
324         if end > len(self.input):
326         if self.input[self.cur:end] == constant:
327             self.cur = end
331     def _parse_allow_trailing(self):  argument
333         self.consume_whitespace()
334         if self.is_done():
337         next_char = self.input[self.cur]
339             return self.parse_list()
341             return self.parse_number()
343             return self.parse_string()
344         elif self._constant_follows('true'):
346         elif self._constant_follows('false'):
349             raise GNException("Unexpected token: " + self.input[self.cur:])
351     def _parse_ident(self) -> str:  argument
354         next_char = self.input[self.cur]
356             raise GNException("Expected an identifier: " + self.input[self.cur:])
359         self.cur += 1
361         next_char = self.input[self.cur]
364             self.cur += 1
365             next_char = self.input[self.cur]