# 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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