import { indent } from './indent';
import { Node, input } from '../parser';
import { inspect } from '../../debug.test';

describe('Unit: lib/parser/combinator/indent', () => {
  describe('indent', () => {
    it('valid', () => {
      const parser = indent((input, output) => output.append(new Node(input.source)) && output.context);
      assert.deepStrictEqual(inspect(parser, input('')), undefined);
      assert.deepStrictEqual(inspect(parser, input(' ')), undefined);
      assert.deepStrictEqual(inspect(parser, input('  ')), undefined);
      assert.deepStrictEqual(inspect(parser, input('a ')), undefined);
      assert.deepStrictEqual(inspect(parser, input(' a')), [['a'], '']);
      assert.deepStrictEqual(inspect(parser, input(' a ')), [['a '], '']);
      assert.deepStrictEqual(inspect(parser, input(' a\n')), [['a'], '']);
      assert.deepStrictEqual(inspect(parser, input(' a \n')), [['a '], '']);
      assert.deepStrictEqual(inspect(parser, input('  a')), [['a'], '']);
      assert.deepStrictEqual(inspect(parser, input('   a')), [['a'], '']);
      assert.deepStrictEqual(inspect(parser, input('    a')), [['a'], '']);
      assert.deepStrictEqual(inspect(parser, input('     a')), [[' a'], '']);
      assert.deepStrictEqual(inspect(parser, input(' a\n a')), [['a\na'], '']);
      assert.deepStrictEqual(inspect(parser, input(' a\n  a')), [['a\n a'], '']);
      assert.deepStrictEqual(inspect(parser, input('    a\n        a')), [['a\n    a'], '']);
      assert.deepStrictEqual(inspect(parser, input('  a\n a')), [['a'], ' a']);
      assert.deepStrictEqual(inspect(parser, input(' \ta')), [['\ta'], '']);
      assert.deepStrictEqual(inspect(parser, input('\ta')), [['a'], '']);
    });

  });

});