The Toy Language Interpreter Project

Details

Author: Miriam Briskman

Supervised by: Professor Neng-Fa Zhou

Course: CISC 3160, "Programming Languages", of CUNY Brooklyn College

Semester: Fall 2019

Used Language: C++

Assignment's Description: http://www.sci.brooklyn.cuny.edu/~zhou/teaching/cis3160/project.html

Getting Started

• Save all the files into a single folder on your computer.
• Create a text file, say myProg.txt, with a program that you want to interpret in that same folder.
• Using a command-line processor:

  • Set the current directory to where the files were downloaded.

  • If you prefer to use g++ as a compiler, type

    g++ -o Toylang.exe Toylang.cpp

    to compile and create an executable named Toylang.exe.

  • Type

    Toylang myProg or Toylang myProg.txt (on Windows)

    or

    ./Toylang myProg or ./Toylang myProg.txt (on Unix / Linux and MAC)

    to run the intepreter on the file myProg.txt that you created.

  • Alternatively, type

    Toylang (on Windows)

    or

    ./Toylang (on Unix / Linux and MAC)

    and follow the instructions to enter the name of the textfile to interpret.

Examples

• See program examples at http://www.sci.brooklyn.cuny.edu/~zhou/teaching/cis3160/project.html.
• Try the interpreter on errors1.txt, errors2.txt and test.txt found in this repository.

  • The files errors1.txt :

    ampersand = &;
    y++;
    6 = 6;
    w z = 3;
    anotherVar = 7 8;
    num = 15*8+(16+ -4*9));
    c = 0-8;;
    res = 2+2*;
    g;
    = 14;
    x = ((5+6);
    cat = 5(2+3);
    _ == 0;
    temp = 2+*5;
    e = (3-);
    y = t;
    y = 4+9
    

    and errors2.txt :

    x
    

    test for 17 different syntactic errors and 1 semantic error (uninitialized variables).

  • The file test.txt :

    _FOO = 9+9*7--5*7--8+9;
    bar007 = 9+0-5--_FOO;
    bla_bla = ---0*7+8+8+8;
    y=1+2+3+4+5;
    x=y;
    z = x-y-y+y-x;
    p=1;
    q=2;
    s= -p*-q+p*q*p;
    r=p*-++-+-p*(p+p+p);
    t=2*p+5*5+8+8;
    a=+t--t+t*(p+(q-p*-q));
    b=-(a)-(a);
    wow = 1;
    wow = wow + 1;
    

    contains no errors. Use it to see how the interpreter successfully prints the values of all the variables.

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Thank you for Reading! Miriam Briskman