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318
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1
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2 class Tree:
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319
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3 """ Tree node with a name and possibly some child nodes """
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318
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4 def __init__(self, name, *args):
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5 self.name = name
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322
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6 self.value = None
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318
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7 self.children = args
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8
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9 def __repr__(self):
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319
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10 if self.children:
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11 ch = ', '.join(str(c) for c in self.children)
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12 return '{}({})'.format(self.name, ch)
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13 else:
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14 return '{}'.format(self.name)
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15
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16
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17 class State:
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320
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18 """ State used to label tree nodes """
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319
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19 def __init__(self):
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20 self.labels = {}
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320
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21
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319
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22 def has_goal(self, goal):
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23 return goal in self.labels
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320
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24
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319
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25 def get_cost(self, goal):
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26 return self.labels[goal][0]
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320
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27
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319
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28 def get_rule(self, goal):
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29 return self.labels[goal][1]
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320
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30
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319
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31 def set_cost(self, goal, cost, rule):
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32 if self.has_goal(goal):
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33 if self.get_cost(goal) > cost:
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34 self.labels[goal] = (cost, rule)
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35 else:
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36 self.labels[goal] = (cost, rule)
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37
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320
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38
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319
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39 class BaseMatcher:
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320
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40 """ Base class for matcher objects. """
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319
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41 def kids(self, tree, rule):
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42 return self.kid_functions[rule](tree)
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43
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44 def nts(self, rule):
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45 return self.nts_map[rule]
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46
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47 def burm_label(self, tree):
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320
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48 """ Label all nodes in the tree bottom up """
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319
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49 for c in tree.children:
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50 self.burm_label(c)
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51 self.burm_state(tree)
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52
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53 def apply_rules(self, tree, goal):
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54 rule = tree.state.get_rule(goal)
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320
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55 results = [self.apply_rules(kid_tree, kid_goal)
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323
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56 for kid_tree, kid_goal in zip(self.kids(tree, rule), self.nts(rule))]
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57 return self.pat_f[rule](tree, *results)
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