ANTLR is a parser generator that uses LL(k) parsing.
ANTLR stands for "ANother Tool for Language Recognition". Given that ANTLR is in competition with LR parser generators, the alternative reading "ANT(i)-LR" may not be accidental.
For an introduction, see the ANTLR tutorial at the University of Birmingham. For background on the theory, see articles from the ANTLR pages, e.g. an ANTLR journal paper.
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