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This chapter describes the first phase of a compiler, namely lexical analysis (scanning). It shows how a source program is transformed into a token stream that is then passed on to the next compiler phase (syntax analysis). Using regular grammars to specify the structure of the lexical symbols, it explains how a scanner works as an automaton that transforms a character stream into a token stream. It finally shows how to write a scanner for MicroJava.

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Lexical Analysis

  • 章节

  • 发表日期：

    2025年

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  • Hanspeter Mössenböck

摘要

This chapter describes the first phase of a compiler, namely lexical analysis (scanning). It shows how a source program is transformed into a token stream that is then passed on to the next compiler phase (syntax analysis). Using regular grammars to specify the structure of the lexical symbols, it explains how a scanner works as an automaton that transforms a character stream into a token stream. It finally shows how to write a scanner for MicroJava.