6ee1494d6e
Suuggested by Frank Heckenbach. <https://lists.gnu.org/r/bug-bison/2022-01/msg00000.html> * doc/bison.texi (Location Type): Explain why location's "column" are defined vaguely. Show tab handling in ltcalc and calc++. * examples/c/bistromathic/parse.y: Show tab handling. * examples/c++/calc++/calc++.test, * examples/c/bistromathic/bistromathic.test: Check tab handling.
calc++ - A Flex+Bison calculator
This directory contains calc++, a Bison grammar file in C++. If you never saw the traditional implementation in C, please first read examples/c/lexcalc, which can be seen as a C precursor of this example.
Read the corresponding chapter in the documentation: "A Complete C++ Example". It is also available on line (maybe with a different version of Bison).
To use it, copy this directory into some work directory, and run make to
compile the executable, and try it. It is a simple calculator which accepts
several variable definitions, one per line, and then a single expression to
evaluate.
The program calc++ expects the file to parse as argument; pass - to read
the standard input (and then hit , control-d, to end your input).
$ ./calc++ -
one := 1
two := 2
three := 3
(one + two * three) * two * three
<Ctrl-d>
42
You may pass -p to activate the parser debug traces, and -s to activate
the scanner's.