What is the best parser generator?

Java Compiler Compiler (JavaCC) is the most popular parser generator for use with Java applications. A parser generator is a tool that reads a grammar specification and converts it to a Java program that can recognize matches to the grammar.

Which parser does yacc use?

The parser generated by Yacc is an LALR(1) parser with a few pragmatic extensions to deal with non-LALR(1) grammars and other problems having to do with the fact that grammars sometimes are wrong and Yacc must signal those problems in a useful way, so that the grammar creator can improve it.

Is Lex a parser generator?

Lex is commonly used with the yacc parser generator. Lex, originally written by Mike Lesk and Eric Schmidt and described in 1975, is the standard lexical analyzer generator on many Unix systems, and an equivalent tool is specified as part of the POSIX standard.

What is yacc parser generator?

YACC is a automatic tool that generates the parser program. YACC stands for Yet Another Compiler Compiler. This program is available in UNIX OS. The construction of LR parser requires lot of work for parsing the input string.

How do I use Lex and YACC?

When compiling a lex/yacc application, the general process is:

1. Run yacc on your parser definition.
2. Run lex on your lexical definition.
3. Compile the generated yacc source.
4. Compile the generated lex source.
5. Compile any other modules.
6. Link lex, yacc, and your other sources into an executable.

What is YACC program?

YACC stands for Yet Another Compiler Compiler. YACC is a program designed to compile a LALR (1) grammar. It is used to produce the source code of the syntactic analyzer of the language produced by LALR (1) grammar. The input of YACC is the rule or grammar and the output is a C program.

What is lex in compiler design?

Lex is a program designed to generate scanners, also known as tokenizers, which recognize lexical patterns in text. Lex is an acronym that stands for “lexical analyzer generator.” It is intended primarily for Unix-based systems. The code for Lex was originally developed by Eric Schmidt and Mike Lesk.

What is Lex use for?

Lex is a program that generates lexical analyzer. It is used with YACC parser generator. The lexical analyzer is a program that transforms an input stream into a sequence of tokens. It reads the input stream and produces the source code as output through implementing the lexical analyzer in the C program.

What is the difference between Lex and Yacc?

The main difference between Lex and Yacc is that Lex is a lexical analyzer which converts the source program into meaningful tokens while Yacc is a parser that generates a parse tree from the tokens generated by Lex. Generally, a compiler is a software program that converts the source code into machine code.

What is generator parser?

A parser generator takes a grammar as input and automatically generates source code that can parse streams of characters using the grammar. The generated code is a parser, which takes a sequence of characters and tries to match the sequence against the grammar.