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[Python3] Fix the import of parser superclasses. 

Until now, the generated Python3 code imported the custom parser
superclasses relatively. However, this only worked in Python3 if
the module was inside a package, since relative imports rely on
__name__ to determine the current module's position in the package
hierarchy. In case of a standalone script, this was always __main__
and hence these relative imports failed.
The patch handles this issue them same way as it is handled by
listener imports.
This commit is contained in:
Renata Hodovan 2018-10-08 13:59:57 +02:00
parent 432022fc1c
commit b748545707
1 changed files with 4 additions and 1 deletions
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5
tool/resources/org/antlr/v4/tool/templates/codegen/Python3/Python3.stg
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@ -119,7 +119,10 @@ Parser(parser, funcs, atn, sempredFuncs, superClass) ::= <<
Parser_(parser, funcs, atn, sempredFuncs, ctor, superClass) ::= <<
<if(superClass)>
from .<superClass> import <superClass>
if __name__ is not None and "." in __name__:
from .<superClass> import <superClass>
else:
from <superClass> import <superClass>
<endif>
<atn>