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Akim Demaille 7bfff37f01 examples: add an example of a push parser

Add an example to demonstrate the use of push parser.  I'm pleasantly
surprised: parse.error=detailed works like a charm with push parsers.

* examples/c/local.mk, examples/c/pushcalc/Makefile
* examples/c/pushcalc/README.md, examples/c/pushcalc/calc.test,
* examples/c/pushcalc/calc.y, examples/c/pushcalc/local.mk:
New.

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calc.test

examples: add an example of a push parser

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calc.y

examples: add an example of a push parser

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local.mk

examples: add an example of a push parser

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Makefile

examples: add an example of a push parser

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README.md

examples: add an example of a push parser

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README.md

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.