Difference between revisions of "Flexc++"
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Latest revision as of 16:44, 24 June 2022
flexc++
https://fbb-git.gitlab.io/flexcpp/
lexical scanner generator generating C++ sources
Flexc++ was designed after `flex'. Flexc++ offers as compared to flex's C++ option a cleaner class-design.
Flexc++ generates a scanner class that is ready for use, as well as a member function producing the lexical scanner tokens (lex()). The class can easily be provided with additional members without the need for polymorphic functions. Consequently, classes generated by flexc++ have no virtual members and actually have but one public member: lex(), replacing the old-style flex and flex++ yylex() function.
Flexc++ offers many options, among which an option to define classes generated by flexc++ in a separate namespace. This allows developers to define additional symbols, even outside of the class generated by flexc++, without encountering name-collision problems. With flexc++, artificial means to prevent name-collisions, like the yy-conventions used by flex and flex++ are no longer required. Flexc++ generates C++ code. If C code is required, flex should be used. Flexc++'s grammar requirements are highly compatible with flex's requirements, so converting a flex grammar into a flexc++ grammar should be fairly simple.
In addition to the flexc++ scanner generator itself and several skeleton files, the package contains an extensive man-page, as well as a full manual rewritten after the original flex manual, and several examples.
To create the program from its sources, either descend into the flexc++ directory, or unpack a created archive, cd into its top-level directory and follow the instructions provided in the INSTALL file found there.
Alternatively, binary ready-to-install versions of flexc++ are available in verious GNU/Linux distributions, in particular Debian. See, e.g., https://packages.debian.org/search?keywords=flexc%2B%2B&searchon=names&suite=all§ion=all
Gitlab's web-pages for flexc++ are here: https://fbb-git.gitlab.io/flexcpp/
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