This directory contains the Fortran parse tree grammar (fortran.g4) and the
Fortran AST description (Fortran.asdl). The first is used by ANTLR4 to generate
a Python parser, the second is used by asdl_py.py to generate Python AST
classes and visitors. All generates files are written into the lfortran
module as Python files and once they are generated, this grammar directory is
not needed anymore and lfortran becomes just a regular Python library that
has all the Python files it needs.
grammar
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