Mercurial > lcfOS
comparison python/pyyacc.py @ 341:4d204f6f7d4e devel
Rewrite of assembler parts
| author | Windel Bouwman |
|---|---|
| date | Fri, 28 Feb 2014 18:07:14 +0100 |
| parents | c7cc54c0dfdf |
| children | 3bb7dcfe5529 |
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| 340:c7cc54c0dfdf | 341:4d204f6f7d4e |
|---|---|
| 264 return action_table, goto_table | 264 return action_table, goto_table |
| 265 | 265 |
| 266 | 266 |
| 267 class Production: | 267 class Production: |
| 268 """ Production rule for a grammar """ | 268 """ Production rule for a grammar """ |
| 269 def __init__(self, name, symbols, f=None): | 269 def __init__(self, name, symbols, f): |
| 270 self.name = name | 270 self.name = name |
| 271 self.symbols = symbols | 271 self.symbols = symbols |
| 272 self.f = f | 272 self.f = f |
| 273 | 273 |
| 274 def __repr__(self): | 274 def __repr__(self): |
| 307 return self.dotpos == len(self.production.symbols) | 307 return self.dotpos == len(self.production.symbols) |
| 308 | 308 |
| 309 @property | 309 @property |
| 310 def IsShift(self): | 310 def IsShift(self): |
| 311 """ Check if this item is a shift item, i.e. the dot can proceed """ | 311 """ Check if this item is a shift item, i.e. the dot can proceed """ |
| 312 return not self.IsReduce | 312 return self.dotpos < len(self.production.symbols) |
| 313 | 313 |
| 314 @property | 314 @property |
| 315 def Next(self): | 315 def Next(self): |
| 316 """ Returns the symbol after the dot """ | 316 """ Returns the symbol after the dot """ |
| 317 return self.production.symbols[self.dotpos] | 317 return self.production.symbols[self.dotpos] |