test/unit/autosubscript.test.js

suite('autoSubscript', function() {
  var mq;
  setup(function() {
    mq = MQ.MathField($('<span></span>').appendTo('#mock')[0], {autoSubscriptNumerals: true});
    rootBlock = mq.__controller.root;
    controller = mq.__controller;
    cursor = controller.cursor;
  });

  test('auto subscripting variables', function() {
    mq.latex('x');
    mq.typedText('2');
    assert.equal(mq.latex(), 'x_2');
    mq.typedText('3');
    assert.equal(mq.latex(), 'x_{23}');
  });

  test('do not autosubscript functions', function() {
    mq.latex('sin');
    mq.typedText('2');
    assert.equal(mq.latex(), '\\sin2');
    mq.typedText('3');
    assert.equal(mq.latex(), '\\sin23');
  });

  test('autosubscript exponentiated variables', function() {
    mq.latex('x^2');
    mq.typedText('2');
    assert.equal(mq.latex(), 'x_2^2');
    mq.typedText('3');
    assert.equal(mq.latex(), 'x_{23}^2');
  });

  test('do not autosubscript exponentiated functions', function() {
    mq.latex('sin^{2}');
    mq.typedText('2');
    assert.equal(mq.latex(), '\\sin^22');
    mq.typedText('3');
    assert.equal(mq.latex(), '\\sin^223');
  });

  test('do not autosubscript subscripted functions', function() {
    mq.latex('sin_{10}');
    mq.typedText('2');
    assert.equal(mq.latex(), '\\sin_{10}2');
  });


  test('backspace through compound subscript', function() {
    mq.latex('x_{2_2}');

    //first backspace moves to cursor in subscript and peels it off
    mq.keystroke('Backspace');
    assert.equal(mq.latex(),'x_2');

    //second backspace clears out remaining subscript
    mq.keystroke('Backspace');
    assert.equal(mq.latex(),'x_{ }');

    //unpeel subscript
    mq.keystroke('Backspace');
    assert.equal(mq.latex(),'x');
  });

  test('backspace through simple subscript', function() {
    mq.latex('x_{2+3}');

    assert.equal(cursor.parent, rootBlock, 'start in the root block');

    //backspace peels off subscripts but stays at the root block level
    mq.keystroke('Backspace');
    assert.equal(mq.latex(),'x_{2+}');
    assert.equal(cursor.parent, rootBlock, 'backspace keeps us in the root block');
    mq.keystroke('Backspace');
    assert.equal(mq.latex(),'x_2');
    assert.equal(cursor.parent, rootBlock, 'backspace keeps us in the root block');

    //second backspace clears out remaining subscript and unpeels
    mq.keystroke('Backspace');
    assert.equal(mq.latex(),'x');
  });

  test('backspace through subscript & superscript with autosubscripting on', function() {
    mq.latex('x_2^{32}');

    //first backspace peels off the subscript
    mq.keystroke('Backspace');
    assert.equal(mq.latex(),'x^{32}');

    //second backspace goes into the exponent
    mq.keystroke('Backspace');
    assert.equal(mq.latex(),'x^{32}');

    //clear out exponent
    mq.keystroke('Backspace');
    mq.keystroke('Backspace');
    assert.equal(mq.latex(),'x^{ }');

    //unpeel exponent
    mq.keystroke('Backspace');
    assert.equal(mq.latex(),'x');
  });
});