Lex and yacc john r. levine pdf4/28/2023 You can optionally attach actions thatĮxecute when certain patterns are encountered. It might take a bit to digest, but all of theĮssential parts of writing a lexer are there. This is always required tokens = ', lineno = 7, index = 88 ) # calclex.py from sly import Lexer class CalcLexer ( Lexer ): # Set of token names. Used as a reference for SLY as the concepts are virtually identical. O’Reilly’s “LexĪnd Yacc” by John Levine may also be handy. Techniques, and Tools”, by Aho, Sethi, and Ullman. Want to consult an introductory text such as “Compilers: Principles, If you are unfamiliar with these topics, you will probably Parsing theory, syntax directed translation, and the use of compilerĬonstruction tools such as lex and yacc in other programming The rest of this document assumes that you are somewhat familiar with Instead, you will find a bare-bones, yetįully capable library for writing parsers in Python. Nor should you view itĪs a parsing framework. The way of bells and whistles (e.g., automatic construction ofĪbstract syntax trees, tree traversal, etc.). It should also be noted that SLY does not provide much in Most of theįeatures available in lex and yacc are also available in SLY. It is looselyīased on the traditional compiler construction tools lex and yaccĪnd implements the same LALR(1) parsing algorithm. SLY is library for writing parsers and compilers.
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