Yacc is which of the following parsers?

The correct answer is LALR Parser.

Key Points

• Yacc (Yet Another Compiler-Compiler) is a tool used to generate a parser in the form of a LALR (Look-Ahead LR) parser.
  • A LALR parser is a type of LR parser, specifically designed to handle a larger set of grammars than SLR parsers, while being more efficient than CLR parsers.
  • Yacc is widely used in compiler construction to generate the syntax analysis phase of a compiler.
  • It takes a formal grammar for the source language and produces source code for a parser that can parse the language.
  • Yacc generates an LALR(1) parser, which means it uses one look-ahead symbol to make parsing decisions.

Additional Information

• Yacc has been instrumental in the development of many programming languages, including C and many others.
• It is often used in conjunction with a lexical analyzer generator like Lex.
• Yacc's output is typically in the form of C source code, which can be compiled to produce the parser.
• The combination of Lex and Yacc allows for the creation of a complete compiler front end, including lexical analysis and syntax analysis.
• Yacc was developed at AT&T Bell Laboratories in the early 1970s by Stephen C. Johnson.