classifyTools
fontTools.misc.classifyTools.py – tools for classifying things.
- class fontTools.misc.classifyTools.Classifier(sort=True)[source]
Main Classifier object, used to classify things into similar sets.
- getClasses()[source]
Returns the list of class sets.
The return value belongs to the Classifier object and should NOT be modified while the classifier is still in use.
- getMapping()[source]
Returns the mapping from things to their class set.
The return value belongs to the Classifier object and should NOT be modified while the classifier is still in use.
- fontTools.misc.classifyTools.classify(list_of_sets, sort=True)[source]
Takes a iterable of iterables (list of sets from here on; but any iterable works.), and returns the smallest list of sets such that each set, is either a subset, or is disjoint from, each of the input sets.
In other words, this function classifies all the things present in any of the input sets, into similar classes, based on which sets things are a member of.
If sort=True, return class sets are sorted by decreasing size and their natural sort order within each class size. Otherwise, class sets are returned in the order that they were identified, which is generally not significant.
>>> classify([]) == ([], {}) True >>> classify([[]]) == ([], {}) True >>> classify([[], []]) == ([], {}) True >>> classify([[1]]) == ([{1}], {1: {1}}) True >>> classify([[1,2]]) == ([{1, 2}], {1: {1, 2}, 2: {1, 2}}) True >>> classify([[1],[2]]) == ([{1}, {2}], {1: {1}, 2: {2}}) True >>> classify([[1,2],[2]]) == ([{1}, {2}], {1: {1}, 2: {2}}) True >>> classify([[1,2],[2,4]]) == ([{1}, {2}, {4}], {1: {1}, 2: {2}, 4: {4}}) True >>> classify([[1,2],[2,4,5]]) == ( ... [{4, 5}, {1}, {2}], {1: {1}, 2: {2}, 4: {4, 5}, 5: {4, 5}}) True >>> classify([[1,2],[2,4,5]], sort=False) == ( ... [{1}, {4, 5}, {2}], {1: {1}, 2: {2}, 4: {4, 5}, 5: {4, 5}}) True >>> classify([[1,2,9],[2,4,5]], sort=False) == ( ... [{1, 9}, {4, 5}, {2}], {1: {1, 9}, 2: {2}, 4: {4, 5}, 5: {4, 5}, ... 9: {1, 9}}) True >>> classify([[1,2,9,15],[2,4,5]], sort=False) == ( ... [{1, 9, 15}, {4, 5}, {2}], {1: {1, 9, 15}, 2: {2}, 4: {4, 5}, ... 5: {4, 5}, 9: {1, 9, 15}, 15: {1, 9, 15}}) True >>> classes, mapping = classify([[1,2,9,15],[2,4,5],[15,5]], sort=False) >>> set([frozenset(c) for c in classes]) == set( ... [frozenset(s) for s in ({1, 9}, {4}, {2}, {5}, {15})]) True >>> mapping == {1: {1, 9}, 2: {2}, 4: {4}, 5: {5}, 9: {1, 9}, 15: {15}} True