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Allow using | on terminals with flags, as long as their flags match

This commit is contained in:
Erez Shinan 2017-11-20 13:11:35 +02:00
parent dcb7297c30
commit 59825260f6
1 changed files with 3 additions and 2 deletions
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5
lark/load_grammar.py
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@ -368,8 +368,9 @@ class TokenTreeToPattern(Transformer):
def expansions(self, exps):
if len(exps) == 1:
return exps[0]
assert all(not i.flags for i in exps)
return PatternRE('(?:%s)' % ('|'.join(i.to_regexp() for i in exps)))
if len({i.flags for i in exps}) > 1:
raise GrammarError("Lark doesn't support joining tokens with conflicting flags!")
return PatternRE('(?:%s)' % ('|'.join(i.to_regexp() for i in exps)), exps[0].flags)
def expr(self, args):
inner, op = args