Mercurial > lcfOS
comparison python/pyyacc.py @ 346:3bb7dcfe5529
expanded arm target
| author | Windel Bouwman |
|---|---|
| date | Fri, 07 Mar 2014 17:05:32 +0100 |
| parents | 4d204f6f7d4e |
| children | 9667d78ba79e |
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| 345:b4882ff0ed06 | 346:3bb7dcfe5529 |
|---|---|
| 286 def __init__(self, production, dotpos, look_ahead): | 286 def __init__(self, production, dotpos, look_ahead): |
| 287 self.production = production | 287 self.production = production |
| 288 self.dotpos = dotpos | 288 self.dotpos = dotpos |
| 289 assert self.dotpos <= len(self.production.symbols) | 289 assert self.dotpos <= len(self.production.symbols) |
| 290 self.look_ahead = look_ahead | 290 self.look_ahead = look_ahead |
| 291 self._is_shift = self.dotpos < len(self.production.symbols) | |
| 291 | 292 |
| 292 def getdata(self): | 293 def getdata(self): |
| 293 """ Gets the members as a tuple """ | 294 """ Gets the members as a tuple """ |
| 294 return (self.production, self.dotpos, self.look_ahead) | 295 return (self.production, self.dotpos, self.look_ahead) |
| 295 | 296 |
| 302 return self.getdata().__hash__() | 303 return self.getdata().__hash__() |
| 303 | 304 |
| 304 @property | 305 @property |
| 305 def IsReduce(self): | 306 def IsReduce(self): |
| 306 """ Check if this item has the dot at the end """ | 307 """ Check if this item has the dot at the end """ |
| 307 return self.dotpos == len(self.production.symbols) | 308 return not self._is_shift |
| 308 | 309 |
| 309 @property | 310 @property |
| 310 def IsShift(self): | 311 def IsShift(self): |
| 311 """ Check if this item is a shift item, i.e. the dot can proceed """ | 312 """ Check if this item is a shift item, i.e. the dot can proceed """ |
| 312 return self.dotpos < len(self.production.symbols) | 313 return self._is_shift |
| 313 | 314 |
| 314 @property | 315 @property |
| 315 def Next(self): | 316 def Next(self): |
| 316 """ Returns the symbol after the dot """ | 317 """ Returns the symbol after the dot """ |
| 317 return self.production.symbols[self.dotpos] | 318 return self.production.symbols[self.dotpos] |