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Compiler Designs and Constructions (Page 83 – 92)

Compiler Designs and Constructions (Page 83 – 92). Chapter 4: Scanner (Lexical Analyzer) Objectives: Introduction to Scanner Token Definition Types of Scanners Dr. Mohsen Chitsaz. Scanner (Lexical Analyzer). Task. GetNextToken. Scanner. Parser. Token. Symbol Table. Scanner.

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Compiler Designs and Constructions (Page 83 – 92)

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  1. Compiler Designs and Constructions (Page 83 – 92) Chapter 4: Scanner (Lexical Analyzer) Objectives: Introduction to Scanner Token Definition Types of Scanners Dr. Mohsen Chitsaz Chapter 4: Scanner (Lexical Analyzer)

  2. Scanner (Lexical Analyzer) • Task GetNextToken Scanner Parser Token Symbol Table Chapter 4: Scanner (Lexical Analyzer)

  3. Scanner • Token: • Input File: • Keywords • User id • Symbols • Numbers • Preparation: • Remove Comments • Case Conversion • White Spaces • Compiler Directives (Token Continued) Chapter 4: Scanner (Lexical Analyzer)

  4. Scanner • Preparation of the output listing: • Create a listing file • Keep line numbers • Insert errors, warnings • Table Summary Chapter 4: Scanner (Lexical Analyzer)

  5. Scanner • Definition: Total, Sum, LongNum, Max If • Input Disk -> OS Buffer -> File Buffer -> Program Buffer • Reading large blocks • Min Disk access • Unite allocations • Lookahead/ Pushback Chapter 4: Scanner (Lexical Analyzer)

  6. Scanner • Buffering • Buffer Size • Max lexeme length Chapter 4: Scanner (Lexical Analyzer)

  7. Scanner Lexeme: A, NumOfBooks, Sum Token: ID Chapter 4: Scanner (Lexical Analyzer)

  8. Scanner • Buffer Markers • Start • End • Logical End of Buffer • Next Input • Previous Lexeme • Beginning of Current Lexeme • End of Current Lexeme • Danger Zone • Lookahead Characters Chapter 4: Scanner (Lexical Analyzer)

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