'Scanner generator' diaporamas de présentation

Lexical Analysis Part 1

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Scanner

Scanner. ?????? ??????? ???. Overview of Scanning. The purpose of a scanner is to group input characters into tokens. A scanner is sometimes called a lexical analyzer A precise definition of tokens is necessary to ensure that lexical rules are properly enforced.

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First Phase: Lexical Analysis (Scanning)

CIS 461 Compiler Design & Construction Fall 2012 slides derived from Tevfik Bultan, Keith Cooper, and Linda Torczon Lecture-Module #6 Further Lexical Analysis. First Phase: Lexical Analysis (Scanning). Scanner Maps stream of characters into tokens Basic unit of syntax

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The scanning process

The scanning process. Goal: automate the process Idea: Start with an RE Build a DFA How? We can build a non-deterministic finite automaton (Thompson's construction) Convert that to a deterministic one (Subset construction) Minimize the DFA (Hopcroft's algorithm) Implement it

279 views • 14 slides