Lex and Yacc: A Brisk Tutorial Saumya K. Debray Department of Computer Science The University of Arizona Tucson, AZ A tutorial in Lex & Yacc. 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. Yacc is written in a portable dialect of C1 and the actions, and output subroutine, are in C as well. Moreover, many of the syntactic conventions of Yacc follow C. The heart of the input speciﬁcation is a collection of grammar rules. Each rule describes an allow-able structure and gives it a name. For example, one grammar rule might be.
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