wok annotate re2c/description.txt @ rev 22392

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author Pascal Bellard <pascal.bellard@slitaz.org>
date Sun Dec 01 11:07:17 2019 +0100 (2019-12-01)
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Hans-G?nter@21835 1 Re2c is a free and open-source lexer generator for C and C++.
Hans-G?nter@21835 2 The main goal of the project is to generate very fast lexers that match or
Hans-G?nter@21835 3 exceed the speed of carefully optimized hand-written code. Instead of using
Hans-G?nter@21835 4 traditional table-driven approach, re2c encodes the underlying finite state
Hans-G?nter@21835 5 automata directly in the form of conditional jumps and applies numerous
Hans-G?nter@21835 6 optimizations to the generated code. The resulting programs are faster and
Hans-G?nter@21835 7 often smaller than their table-driven counterparts, and they are much easier
Hans-G?nter@21835 8 to debug and understand.
Hans-G?nter@21835 9 Re2c has an unusual flexible user interface: instead of assuming a fixed
Hans-G?nter@21835 10 program template, it leaves the definition of the interface code to the user
Hans-G?nter@21835 11 and allows to configure almost every aspect of the generated code. This gives
Hans-G?nter@21835 12 the users a lot of freedom in the way they bind the lexer to their particular
Hans-G?nter@21835 13 environment and allows them to decide on the optimal input model.
Hans-G?nter@21835 14 Re2c supports fast and lightweight submatch extraction which does not requre
Hans-G?nter@21835 15 the overhead on full parsing — a feature that is rarely found in the wild.
Hans-G?nter@21835 16 Re2c is used by many other projects (such as php, ninja, yasm, spamassassin,
Hans-G?nter@21835 17 BRL-CAD and wake) and aims at being fully backward compatible.
Hans-G?nter@21835 18 On the other hand, it is a research project and a playground for the
Hans-G?nter@21835 19 development of new algorithms in the field of formal grammars and automata.