QL Implementation

Author: Matt Chapman

Example QL File

form exampleForm {
  "Test question 1"
    testQuestion1: boolean;
  "Test question 2"
    testQuestion2: boolean;
  "Test question 3"
    testQuestion3: boolean;

  if (testQuestion1 && testQuestion2 || testQuestion3) {
    "Conditional question 1"
      conditionalQuestion1: integer;
    "Conditional question 2"
      conditionalQuestion2: integer;
    "Math question 1:"
      mathQuestion1:integer =
        (conditionalQuestion1 - conditionalQuestion2);
  }

   if (complexConditional) {
     "if Question"
         complexConditionalQuestion1: boolean;
   } else {
     "else Question"
        complexConditionalQuestion2: boolean;
   }
}

Prerequisites

• Antlr4
• JUnit 4

Usage

java Launcher to run. The application will provide a filepicker for input. Append the argument -debug to bypass the filepicker and run using res/test.txt.

Implementation Progress

• QL Grammar
• QLVisitor implementation
• Replacement error listener for parser
• Application launcher
• AST
  • Form, Statement, Question classes
  • IfStatement, IfElseStatement classes
  • Classes for Operations
  • Basic types
    • Strings
    • Booleans
    • Integers
• AST Processing
  • Type checking
    • reference to undefined questions
    • duplicate question declarations with different types
    • conditions that are not of the type boolean
    • operands of invalid type to operators
    • cyclic dependencies between questions
    • duplicate labels
  • Error handling
    • Error class
    • Error collection class
    • Make all tests return Error objects
    • Halt on bad error - don't throw exception!
    • Output in GUI
• GUI generation
• Unit tests