1 | #!/usr/bin/env python2
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2 | """pybase.py."""
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3 | from __future__ import print_function
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4 |
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5 | from mycpp import mylib
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6 |
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7 | from typing import TYPE_CHECKING
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8 | if TYPE_CHECKING:
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9 | from _devbuild.gen.hnode_asdl import hnode_t
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10 | from asdl.runtime import TraversalState
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11 |
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12 |
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13 | class Obj(object):
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14 | # NOTE: We're using CAPS for these static fields, since they are constant at
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15 | # runtime after metaprogramming.
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16 | ASDL_TYPE = None # Used for type checking
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17 |
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18 |
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19 | class SimpleObj(int):
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20 | """Base type of simple sum types."""
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21 | # TODO: Get rid of this indirection? Although mycpp might use it.
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22 | pass
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23 |
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24 |
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25 | class CompoundObj(Obj):
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26 | # The tag is set for variant types, which are subclasses of sum
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27 | # types. Never set for product types.
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28 | _type_tag = 0 # Starts at 1. Zero is invalid
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29 |
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30 | def PrettyTree(self, trav=None):
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31 | # type: (TraversalState) -> hnode_t
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32 | raise NotImplementedError(self.__class__.__name__)
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33 |
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34 | def _AbbreviatedTree(self, trav=None):
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35 | # type: (TraversalState) -> hnode_t
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36 | raise NotImplementedError(self.__class__.__name__)
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37 |
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38 | def AbbreviatedTree(self, trav=None):
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39 | # type: (TraversalState) -> hnode_t
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40 | raise NotImplementedError(self.__class__.__name__)
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41 |
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42 | def __repr__(self):
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43 | # type: () -> str
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44 | # TODO: Break this circular dependency.
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45 | from asdl import format as fmt
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46 |
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47 | ast_f = fmt.TextOutput(mylib.BufWriter()) # No color by default.
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48 | tree = self.PrettyTree()
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49 | fmt.PrintTree(tree, ast_f)
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50 | s, _ = ast_f.GetRaw()
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51 | return s
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