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PEGTL CSS Parser

This is a draft CSS parser written in C++ using the PEGTL 2.x library (because a dependent project does not want to move to C++17 that PEGTL 3.x requires).

Once you configure and build the project, run

./parse-css file.css

and you will see a stream of all the grammar matching done. It is not pretty, but it allows hand-validation and debugging.

Turn off DBG_PARSE in parse-css.cxx and it will not print these matches as it goes. Instead, it will print a summary at the end and information about how many rulesets and properties it encountered (which is not perfectly computed at this point).

Turn off DBG_GRAMMAR in parse-css.cxx and it will not invoke PEGTL's grammar analysis (cycle detection) before parsing.