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Lexical Analysis - compiler design IT & Software Notes | EduRev

IT & Software : Lexical Analysis - compiler design IT & Software Notes | EduRev

 Page 1


Lexical Analysis 
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Lexical Analysis 
The Scanner 
? The job of the scanner is to read characters 
from the source code and form them into 
tokens.  
? Token classes include: 
– Identifiers 
– Literals (numeric, string, character) 
– Keywords and reserved words 
– Operators 
– Others 
Page 3


Lexical Analysis 
The Scanner 
? The job of the scanner is to read characters 
from the source code and form them into 
tokens.  
? Token classes include: 
– Identifiers 
– Literals (numeric, string, character) 
– Keywords and reserved words 
– Operators 
– Others 
Representing Tokens 
? using the #define macro (C/C++): 
 
 #define IF 256 
 #define THEN 257 
 #define ELSE 258 
 ... 
Page 4


Lexical Analysis 
The Scanner 
? The job of the scanner is to read characters 
from the source code and form them into 
tokens.  
? Token classes include: 
– Identifiers 
– Literals (numeric, string, character) 
– Keywords and reserved words 
– Operators 
– Others 
Representing Tokens 
? using the #define macro (C/C++): 
 
 #define IF 256 
 #define THEN 257 
 #define ELSE 258 
 ... 
Representing Tokens 
? Using named constants (Java): 
 
 public static final IF = 256; 
 public static final THEN = 257; 
 public static final ELSE = 258; 
 ... 
Page 5


Lexical Analysis 
The Scanner 
? The job of the scanner is to read characters 
from the source code and form them into 
tokens.  
? Token classes include: 
– Identifiers 
– Literals (numeric, string, character) 
– Keywords and reserved words 
– Operators 
– Others 
Representing Tokens 
? using the #define macro (C/C++): 
 
 #define IF 256 
 #define THEN 257 
 #define ELSE 258 
 ... 
Representing Tokens 
? Using named constants (Java): 
 
 public static final IF = 256; 
 public static final THEN = 257; 
 public static final ELSE = 258; 
 ... 
Representing Tokens 
? Token classes may have attributes 
– Identifiers have a string name 
– Numeric literals have a value 
– Relational operators have 1 of 6 values 
? We need more than a single scalar object to 
represent tokens. 
– struct 
– class

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Rashmi Sehgal

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372

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