Lex and yacc are still frequently used (alongside similar tools like ANTLR). However, most production compilers use hand-written parsers because it permits bet

Lex and yacc are still frequently used (alongside similar tools like ANTLR). However, most production compilers use hand-written parsers because it permits better error messages and support for partial parses. The latter is useful for e.g. IDEs, where the code is often not entirely syntax-correct.