Siddhardha Garige wrote:
Here is my understanding. At build time bison and flex
work on config
file and generates cfg.tab.c. This file is equivalent to c version of
config file.
That is not correct. Bison and flex do not work on the config file.
They are meta-tools.
Bison and flex take an input in the form of a BNF grammar specification
and assist in the automatic generation of a C-language parser for that
grammar. In other words, they are tools that automate a portion of the
coding that would otherwise be necessary to make the program understand
the syntax and grammar (the "config file language") of the config. The
programmatic parser that is generated by flex and bison is then used by
the program to read, understand, and execute the instructions of your
config file, which is loaded when the program starts.
Thus, the only need to change source code in relation to the config
would be if you wanted to add additional syntactical/lexical features to
the configuration process. Otherwise, they have nothing to do with the
config file per se.
--
Alex Balashov
Evariste Systems
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