170     def __init__(self, string):  argument
171         self.input = string
172         self.cur = 0
174     def IsDone(self):  argument
175         return self.cur == len(self.input)
177     def ConsumeWhitespace(self):  argument
178         while not self.IsDone() and self.input[self.cur] in ' \t\n':
179             self.cur += 1
181     def Parse(self):  argument
199         result = self._ParseAllowTrailing()
200         self.ConsumeWhitespace()
201         if not self.IsDone():
203                               self.input[self.cur:])
206     def ParseArgs(self):  argument
213         self.ConsumeWhitespace()
214         while not self.IsDone():
215             ident = self._ParseIdent()
216             self.ConsumeWhitespace()
217             if self.input[self.cur] != '=':
218                 raise GNException("Unexpected token: " + self.input[self.cur:])
219             self.cur += 1
220             self.ConsumeWhitespace()
221             val = self._ParseAllowTrailing()
222             self.ConsumeWhitespace()
227     def _ParseAllowTrailing(self):  argument
229         self.ConsumeWhitespace()
230         if self.IsDone():
233         next_char = self.input[self.cur]
235             return self.ParseList()
237             return self.ParseNumber()
239             return self.ParseString()
240         elif self._ConstantFollows('true'):
242         elif self._ConstantFollows('false'):
245             raise GNException("Unexpected token: " + self.input[self.cur:])
247     def _ParseIdent(self):  argument
250         next_char = self.input[self.cur]
252             raise GNException("Expected an identifier: " + self.input[self.cur:])
255         self.cur += 1
257         next_char = self.input[self.cur]
260             self.cur += 1
261             next_char = self.input[self.cur]
265     def ParseNumber(self):  argument
266         self.ConsumeWhitespace()
267         if self.IsDone():
270         begin = self.cur
273         if not self.IsDone() and _IsDigitOrMinus(self.input[self.cur]):
274             self.cur += 1
275         while not self.IsDone() and self.input[self.cur].isdigit():
276             self.cur += 1
278         number_string = self.input[begin:self.cur]
283     def ParseString(self):  argument
284         self.ConsumeWhitespace()
285         if self.IsDone():
288         if self.input[self.cur] != '"':
290                               self.input[self.cur:])
291         self.cur += 1  # Skip over quote.
293         begin = self.cur
294         while not self.IsDone() and self.input[self.cur] != '"':
295             if self.input[self.cur] == '\\':
296                 self.cur += 1  # Skip over the backslash.
297                 if self.IsDone():
299                                       self.input)
300             self.cur += 1
302         if self.IsDone():
303             raise GNException('Unterminated string:\n  ' + self.input[begin:])
305         end = self.cur
306         self.cur += 1  # Consume trailing ".
308         return UnescapeGNString(self.input[begin:end])
310     def ParseList(self):  argument
311         self.ConsumeWhitespace()
312         if self.IsDone():
316         if self.input[self.cur] != '[':
318                               self.input[self.cur:])
319         self.cur += 1
320         self.ConsumeWhitespace()
321         if self.IsDone():
322             raise GNException("Unterminated list:\n  " + self.input)
326         while not self.IsDone():
327             if self.input[self.cur] == ']':
328                 self.cur += 1  # Skip over ']'.
334             list_result += [self._ParseAllowTrailing()]
335             self.ConsumeWhitespace()
336             if self.IsDone():
340             previous_had_trailing_comma = self.input[self.cur] == ','
343                 self.cur += 1
344                 self.ConsumeWhitespace()
346         raise GNException("Unterminated list:\n  " + self.input)
348     def _ConstantFollows(self, constant):  argument
353         end = self.cur + len(constant)
354         if end > len(self.input):
356         if self.input[self.cur:end] == constant:
357             self.cur = end