The project for this term is the implement the following project in language: Java

Interpreter Project

This project will be to write an interpreter for a minimal form of Julia. This minimal form of Julia has only 1 data type, integer, and the only identifiers are single letters.

The interpreter will parse a Julia program and build some intermediate data structures. These data structures will then be interpreted to execute the program. All tokens in this language are separated by white space. The parsing algorithm should detect any syntactical or semantic error. The first such error discovered should cause an appropriate error message to be printed, and then the interpreter should terminate. Run-time errors should also be detected with appropriate error messages being printed.

Grammar for the language

Parser

function id ( ) end

|

| | | |

if else end

while end

-> id

-> for id = end

print ( )

:

le_operator | lt_operator | ge_operator | gt_operator | eq_operator | ne_operator

| |

add_operator | sub_operator | mul_operator | div_operator | mod_operator | exp_operator | rev_div_operator

Lexical Analyzer

id letter

literal_integer digit literal_integer | digit

assignment_operator =

le_operator <=

lt_operator <

ge_operator >=

gt_operator >

eq_operator = =

ne_operator !=

add_operator +

sub_operator -

mul_operator *

div_operator /

mod_operator %

rev_div_operator \

exp_operator ^

------------------------------------------ input.txt ------------------------------------------

function f ( ) x = 2 y = 3 z = + x y print ( z ) end

function x ( ) x = 7 if < x 4 print ( x ) else print ( * x 2 ) end end

function w ( ) r = 5 while <= r 10 print ( r ) r = + r 1 end print ( 89 ) end

function a ( ) for i = 3 : 5 if != i 4 print ( i ) else print ( 333 ) end end end

-----------------

Output

-----------------

5

14

5

6

7

8

9

10

89

3

333

5

r: 11

x: 7

y: 3

i: 5

z: 5

What's needed!?

(Create a Java program which has a parsing algorithm that should detect any syntactical or semantic error based on the grammer for the language. If a error is discovered then it should cause an appropriate error message to be printed, and then the program should terminate.) Parsing algorithm should use the input.txt file I provided and it should parse accordingly and also give back results.

The representation has been fixed. Thank you, Hope it is all good!