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39 lines
1.1 KiB
Python
39 lines
1.1 KiB
Python
# -*- coding: utf-8 -*-
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from grammarinator.runtime.tree import *
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from itertools import tee, islice, zip_longest
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import random
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def single_line_whitespace(node):
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return _whitespace(node, ' \t')
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def multi_line_whitespace(node):
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return _whitespace(node, ' \t\r\n')
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def _whitespace(node, symbols):
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for child in node.children:
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_whitespace(child, symbols)
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# helper function to look ahead one child
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def with_next(iterable):
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items, nexts = tee(iterable, 2)
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nexts = islice(nexts, 1, None)
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return zip_longest(items, nexts)
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if isinstance(node, UnparserRule):
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new_children = []
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for child, next_child in with_next(node.children):
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if (not next_child or
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next_child and isinstance(next_child, UnlexerRule) and next_child.name == 'DOT' or
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isinstance(child, UnlexerRule) and child.name == 'DOT'):
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new_children.append(child)
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else:
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new_children.extend([child, UnlexerRule(src=random.choice(symbols))])
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node.children = new_children
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return node
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