SIng, algorithm> (LALR, Look ahead LR) A type of {LR parser} that can deal with more {context-free grammars} than SLR parsers but less than LR[1] parsers. LALR parsers are popular because they give a good trade-off between the number of grammars they can deal with and the SIze of the parSIng table required. Compiler compilers like yacc and Bison generate LALR parsers. Wikipedia . (2003-05-13)