Mercurial > public > mercurial-scm > hg-stable
comparison mercurial/revset.py @ 20749:c3e49b127de0
revset: added _orderedsetmixin class
This class has utility methods for any ordered class to get the min and the
max values.
| author | Lucas Moscovicz <lmoscovicz@fb.com> |
|---|---|
| date | Wed, 12 Mar 2014 16:40:18 -0700 |
| parents | 6b731b29e154 |
| children | d4f2f2d74210 |
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| 20748:6b731b29e154 | 20749:c3e49b127de0 |
|---|---|
| 2252 boolean. | 2252 boolean. |
| 2253 | 2253 |
| 2254 This is part of the mandatory API for smartset.""" | 2254 This is part of the mandatory API for smartset.""" |
| 2255 return lazyset(self, condition) | 2255 return lazyset(self, condition) |
| 2256 | 2256 |
| 2257 class _orderedsetmixin(object): | |
| 2258 """Mixin class with utility methods for smartsets | |
| 2259 | |
| 2260 This should be extended by smartsets which have the isascending(), | |
| 2261 isdescending() and reverse() methods""" | |
| 2262 | |
| 2263 def _first(self): | |
| 2264 """return the first revision in the set""" | |
| 2265 for r in self: | |
| 2266 return r | |
| 2267 return None | |
| 2268 | |
| 2269 def _last(self): | |
| 2270 """return the last revision in the set""" | |
| 2271 self.reverse() | |
| 2272 m = self._first() | |
| 2273 self.reverse() | |
| 2274 return m | |
| 2275 | |
| 2276 def min(self): | |
| 2277 """return the smallest element in the set""" | |
| 2278 if self.isascending(): | |
| 2279 return self._first() | |
| 2280 return self._last() | |
| 2281 | |
| 2282 def max(self): | |
| 2283 """return the largest element in the set""" | |
| 2284 if self.isascending(): | |
| 2285 return self._last() | |
| 2286 return self._first() | |
| 2287 | |
| 2257 class lazyset(object): | 2288 class lazyset(object): |
| 2258 """Duck type for baseset class which iterates lazily over the revisions in | 2289 """Duck type for baseset class which iterates lazily over the revisions in |
| 2259 the subset and contains a function which tests for membership in the | 2290 the subset and contains a function which tests for membership in the |
| 2260 revset | 2291 revset |
| 2261 """ | 2292 """ |