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Solved-Assignment 1 Lexical Analyzer- Solution

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Note: In your documentation (design section), YOU MUST write the REs for Identifiers, Real and Integer, and also show the NFSM using Thompson. The Lexer A major component of your assignment will be to write a procedure (Function) – lexer (), that returns a token when it is needed. Your lexer() should return a record,…

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Note: In your documentation (design section), YOU MUST write the REs for Identifiers, Real and Integer, and also show the NFSM using Thompson.

The Lexer

A major component of your assignment will be to write a procedure (Function) – lexer (), that returns a token when it is needed. Your lexer() should return a record, one field for the token and another field the actual “value” of the token (lexeme), i.e. the instance of a token.

Your main program should test the lexer i.e., your program should read a file containing the source code given from class to generate tokens and write out the results to an output

file . Make sure that you print both, the tokens and lexemes.

Basically, your main program should work as follows while not finished (i.e. not end of the source file) do

call the lexer for a token

print the token and lexeme

endwhile

Do at least 3 test cases and make sure that you turn in proper documentation using the documentation template.

A simple test case

(Partial) Source code:

while (fahr < upper) a = 23.00 whileend

Output:

token

lexeme

keyword

while

separator

(

identifier

fahr

operator

<

identifier

upper

separator

)

identifier

a

operator

=

real

23.00

keyword

whileend