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import IndentHelper from '~/helpers/indent_helper';
function createMockTextarea() {
const el = document.createElement('textarea');
el.setCursor = pos => el.setSelectionRange(pos, pos);
el.setCursorToEnd = () => el.setCursor(el.value.length);
el.selection = () => [el.selectionStart, el.selectionEnd];
el.cursor = () => {
const [start, end] = el.selection();
return start === end ? start : undefined;
};
return el;
}
describe('indent_helper', () => {
let element;
let ih;
beforeEach(() => {
element = createMockTextarea();
ih = new IndentHelper(element);
});
describe('indents', () => {
describe('a single line', () => {
it('when on an empty line; and cursor follows', () => {
element.value = '';
ih.indent();
expect(element.value).toBe(' ');
expect(element.cursor()).toBe(4);
ih.indent();
expect(element.value).toBe(' ');
expect(element.cursor()).toBe(8);
});
it('when at the start of a line; and cursor stays at start', () => {
element.value = 'foobar';
element.setCursor(0);
ih.indent();
expect(element.value).toBe(' foobar');
expect(element.cursor()).toBe(4);
});
it('when the cursor is in the middle; and cursor follows', () => {
element.value = 'foobar';
element.setCursor(3);
ih.indent();
expect(element.value).toBe(' foobar');
expect(element.cursor()).toBe(7);
});
});
describe('several lines', () => {
it('when everything is selected; and everything remains selected', () => {
element.value = 'foo\nbar\nbaz';
element.setSelectionRange(0, 11);
ih.indent();
expect(element.value).toBe(' foo\n bar\n baz');
expect(element.selection()).toEqual([0, 23]);
});
it('when all lines are partially selected; and the selection adapts', () => {
element.value = 'foo\nbar\nbaz';
element.setSelectionRange(2, 9);
ih.indent();
expect(element.value).toBe(' foo\n bar\n baz');
expect(element.selection()).toEqual([6, 21]);
});
it('when some lines are entirely selected; and entire lines remain selected', () => {
element.value = 'foo\nbar\nbaz';
element.setSelectionRange(4, 11);
ih.indent();
expect(element.value).toBe('foo\n bar\n baz');
expect(element.selection()).toEqual([4, 19]);
});
it('when some lines are partially selected; and the selection adapts', () => {
element.value = 'foo\nbar\nbaz';
element.setSelectionRange(5, 9);
ih.indent();
expect(element.value).toBe('foo\n bar\n baz');
expect(element.selection()).toEqual([5 + 4, 9 + 2 * 4]);
});
it('having different indentation when some lines are entirely selected; and entire lines remain selected', () => {
element.value = ' foo\nbar\n baz';
element.setSelectionRange(8, 19);
ih.indent();
expect(element.value).toBe(' foo\n bar\n baz');
expect(element.selection()).toEqual([8, 27]);
});
it('having different indentation when some lines are partially selected; and the selection adapts', () => {
element.value = ' foo\nbar\n baz';
element.setSelectionRange(9, 14);
ih.indent();
expect(element.value).toBe(' foo\n bar\n baz');
expect(element.selection()).toEqual([13, 22]);
});
});
});
describe('unindents', () => {
describe('a single line', () => {
it('but does nothing if there is not indent', () => {
element.value = 'foobar';
element.setCursor(2);
ih.unindent();
expect(element.value).toBe('foobar');
expect(element.cursor()).toBe(2);
});
it('but does nothing if there is a partial indent', () => {
element.value = ' foobar';
element.setCursor(1);
ih.unindent();
expect(element.value).toBe(' foobar');
expect(element.cursor()).toBe(1);
});
it('when the cursor is in the line text; cursor follows', () => {
element.value = ' foobar';
element.setCursor(6);
ih.unindent();
expect(element.value).toBe('foobar');
expect(element.cursor()).toBe(2);
});
it('when the cursor is in the indent; and cursor goes to start', () => {
element.value = ' foobar';
element.setCursor(2);
ih.unindent();
expect(element.value).toBe('foobar');
expect(element.cursor()).toBe(0);
});
it('when the cursor is at line start; and cursor stays at start', () => {
element.value = ' foobar';
element.setCursor(0);
ih.unindent();
expect(element.value).toBe('foobar');
expect(element.cursor()).toBe(0);
});
it('when a selection includes part of the indent and text', () => {
element.value = ' foobar';
element.setSelectionRange(2, 8);
ih.unindent();
expect(element.value).toBe('foobar');
expect(element.selection()).toEqual([0, 4]);
});
it('when a selection includes part of the indent only', () => {
element.value = ' foobar';
element.setSelectionRange(0, 4);
ih.unindent();
expect(element.value).toBe('foobar');
expect(element.cursor()).toBe(0);
element.value = ' foobar';
element.setSelectionRange(1, 3);
ih.unindent();
expect(element.value).toBe('foobar');
expect(element.cursor()).toBe(0);
});
});
describe('several lines', () => {
it('when everything is selected', () => {
element.value = ' foo\n bar\n baz';
element.setSelectionRange(0, 27);
ih.unindent();
expect(element.value).toBe('foo\n bar\nbaz');
expect(element.selection()).toEqual([0, 15]);
});
it('when all lines are partially selected', () => {
element.value = ' foo\n bar\n baz';
element.setSelectionRange(5, 26);
ih.unindent();
expect(element.value).toBe('foo\n bar\nbaz');
expect(element.selection()).toEqual([1, 14]);
});
it('when all lines are entirely selected', () => {
element.value = ' foo\n bar\n baz';
element.setSelectionRange(8, 27);
ih.unindent();
expect(element.value).toBe(' foo\n bar\nbaz');
expect(element.selection()).toEqual([8, 19]);
});
it('when some lines are entirely selected', () => {
element.value = ' foo\n bar\n baz';
element.setSelectionRange(8, 27);
ih.unindent();
expect(element.value).toBe(' foo\n bar\nbaz');
expect(element.selection()).toEqual([8, 19]);
});
it('when some lines are partially selected', () => {
element.value = ' foo\n bar\n baz';
element.setSelectionRange(17, 26);
ih.unindent();
expect(element.value).toBe(' foo\n bar\nbaz');
expect(element.selection()).toEqual([13, 18]);
});
it('when some lines are partially selected within their indents', () => {
element.value = ' foo\n bar\n baz';
element.setSelectionRange(10, 22);
ih.unindent();
expect(element.value).toBe(' foo\n bar\nbaz');
expect(element.selection()).toEqual([8, 16]);
});
});
});
describe('newline', () => {
describe('on a single line', () => {
it('auto-indents the new line', () => {
element.value = 'foo\n bar\n baz\n qux';
element.setCursor(3);
ih.newline();
expect(element.value).toBe('foo\n\n bar\n baz\n qux');
expect(element.cursor()).toBe(4);
element.setCursor(9);
ih.newline();
expect(element.value).toBe('foo\n\n bar\n \n baz\n qux');
expect(element.cursor()).toBe(11);
element.setCursor(19);
ih.newline();
expect(element.value).toBe('foo\n\n bar\n \n baz\n \n qux');
expect(element.cursor()).toBe(24);
element.setCursor(36);
ih.newline();
expect(element.value).toBe('foo\n\n bar\n \n baz\n \n qux\n ');
expect(element.cursor()).toBe(45);
});
it('splits a line and auto-indents', () => {
element.value = ' foobar';
element.setCursor(7);
ih.newline();
expect(element.value).toBe(' foo\n bar');
expect(element.cursor()).toBe(12);
});
it('replaces selection with an indented newline', () => {
element.value = ' foobarbaz';
element.setSelectionRange(7, 10);
ih.newline();
expect(element.value).toBe(' foo\n baz');
expect(element.cursor()).toBe(12);
});
});
it('on several lines.replaces selection with indented newline', () => {
element.value = ' foo\n bar\n baz';
element.setSelectionRange(4, 17);
ih.newline();
expect(element.value).toBe(' fo\n az');
expect(element.cursor()).toBe(7);
});
});
describe('backspace', () => {
let event;
// This suite tests only the special indent-removing behaviour of the
// backspace() method, since non-special cases are handled natively as a
// backspace keypress.
beforeEach(() => {
event = { preventDefault: jest.fn() };
});
describe('on a single line', () => {
it('does nothing special if in the line text', () => {
element.value = ' foobar';
element.setCursor(7);
ih.backspace(event);
expect(event.preventDefault).not.toHaveBeenCalled();
});
it('does nothing special if after a non-leading indent', () => {
element.value = ' foo bar';
element.setCursor(11);
ih.backspace(event);
expect(event.preventDefault).not.toHaveBeenCalled();
});
it('deletes one leading indent', () => {
element.value = ' foo';
element.setCursor(8);
ih.backspace(event);
expect(event.preventDefault).toHaveBeenCalled();
expect(element.value).toBe(' foo');
expect(element.cursor()).toBe(4);
});
it('does nothing if cursor is inside the leading indent', () => {
element.value = ' foo';
element.setCursor(4);
ih.backspace(event);
expect(event.preventDefault).not.toHaveBeenCalled();
});
it('does nothing if cursor is at the start of the line', () => {
element.value = ' foo';
element.setCursor(0);
ih.backspace(event);
expect(event.preventDefault).not.toHaveBeenCalled();
});
it('deletes one partial indent', () => {
element.value = ' foo';
element.setCursor(6);
ih.backspace(event);
expect(event.preventDefault).toHaveBeenCalled();
expect(element.value).toBe(' foo');
expect(element.cursor()).toBe(4);
});
it('deletes indents sequentially', () => {
element.value = ' foo';
element.setCursor(10);
ih.backspace(event);
ih.backspace(event);
ih.backspace(event);
expect(event.preventDefault).toHaveBeenCalled();
expect(element.value).toBe('foo');
expect(element.cursor()).toBe(0);
});
});
describe('on several lines', () => {
it('deletes indent only on its own line', () => {
element.value = ' foo\n bar\n baz';
element.setCursor(16);
ih.backspace(event);
expect(event.preventDefault).toHaveBeenCalled();
expect(element.value).toBe(' foo\n bar\n baz');
expect(element.cursor()).toBe(12);
});
it('has no special behaviour with any range selection', () => {
const text = ' foo\n bar\n baz';
for (let start = 0; start < text.length; start += 1) {
for (let end = start + 1; end < text.length; end += 1) {
element.value = text;
element.setSelectionRange(start, end);
ih.backspace(event);
expect(event.preventDefault).not.toHaveBeenCalled();
// Ensure that the backspace() method doesn't change state
// In reality, these two statements won't hold because the browser
// will natively process the backspace event.
expect(element.value).toBe(text);
expect(element.selection()).toEqual([start, end]);
}
}
});
});
});
});
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