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# pushcalc - push parser with Bison
This directory contains pushcalc, the traditional calculator, implemented as
a push parser.
Traditionally Bison is used to create so called "pull parsers": the user
invokes the parser once, which repeatedly calls (pulls) the scanner until
the input is drained.
This example demonstrates the "push parsers": the user calls scanner to
fetch the next token, passes (pushes) it to the parser, and repeats the
operation until the input is drained.
This example is a straightforward conversion of the 'calc' example to the
push-parser model.
<!---
Local Variables:
fill-column: 76
ispell-dictionary: "american"
End:
Copyright (C) 2020-2021 Free Software Foundation, Inc.
Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU Free Documentation License, Version 1.3 or
any later version published by the Free Software Foundation; with no
Invariant Sections, with no Front-Cover Texts, and with no Back-Cover
Texts. A copy of the license is included in the "GNU Free
Documentation License" file as part of this distribution.
--->
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