A simple test project to demonstrate how flex (part of GNU bison) works.
The lex file (mylexer.l) contains a very simple lexical analyzer. It capable to recognize comments, "ConfKey1" and "Confkey2" directives (the list is extendable), and the "include" directive with an argument (filename). If the lexer founds an "include" line, it opens the file and continue the analysis from that point. The parser (myparser.y) contains the minimal grammar.
To compile and test you need:
- GNU Bison (flex at least)
- GCC - or another C compiler, just replace it in Makefile
- make
- download the source
- type a single
makecommand
This will generate the lex.yy.c, myparser.tab.c C source (and the parser header), and the myparser binary.
The source tree contains some configs, you can check the different behaviors.
- first, just run this progam:
./myparser config1.conf. In the result, you can see the operations with a "->" prefix, and the recognized tokens$ cat config1.conf # file: config1.conf # this is a config ConfKey1 foo $ ./myparser config1.conf -> Opening file: config1.conf Comment: # file: config1.conf Comment: # this is a config Directive: ConfKey1 Directive argument: foo -> Got EOF, stack_ptr: 0 -> Closing file: config1.conf - then run
./myparser inctest_01.conf. This file contains fewincludelines sequentually - finally, run the binary with
inctest_02.conf, which contains same structure with help of "*" (asterix) character.
- 0.1
- Initial Release
This project is licensed under the GNU GPL License - see the LICENSE file for details.