Online Lex And Yacc Compiler

In computer science, Backus–Naur form or Backus normal form (BNF) is a notation technique for context-free grammars, often used to describe the syntax of languages used in computing, such as computer programming languages, document formats, instruction sets and communication protocols. Online syntax highlighting for more than 100 languages, including C#, Java, PHP, Basic, Perl, Python, Pascal, SQL, JavaScript and others including rare and obscure ones!

Please enable javascript to best experience this site. This document explains how to construct a compiler using lex and yacc. Lex and yacc are tools used to generate lexical analyzers and parsers. I assume you can program in C and understand data structures such as linked-lists and trees. The Overview describes the basic building blocks of a compiler and explains the interaction between lex and yacc.

The next two sections describe lex and yacc in more detail. With this background we can construct a sophisticated calculator. Conventional arithmetic operations and control statements, such as if-else and while, are implemented. With minor changes we will convert the calculator into a compiler for a stack-based machine. The remaining sections discuss issues that commonly arise in compiler writing. Click on the following links for additional downloads: • (130k) • (5k) Permission to reproduce portions of this document is given provided the web site listed below is referenced.

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