import assert from 'assert';
import * as P from '../src/internal/core';

describe('core', () => {
	describe('difference', () => {
		test('basic', () => {
			const parser = P.difference(P.regexp(/\p{Letter}/u), P.str('x'));

			let result = parser.handler('x',0,{}) as P.Success<any>;
			assert.deepStrictEqual(result,P.failure());

			result = parser.handler('a',0,{}) as P.Success<any>;
			assert.deepStrictEqual(result,P.success(1,'a'));
		});

		test('horizontal whitespace', () => {
			const parser = P.difference(P.regexp(/\s/u), P.newline);

			let result = parser.handler('\n',0,{}) as P.Success<any>;
			assert.deepStrictEqual(result,P.failure());

			result = parser.handler(' ',0,{}) as P.Success<any>;
			assert.deepStrictEqual(result,P.success(1,' '));

			result = parser.handler('\t',0,{}) as P.Success<any>;
			assert.deepStrictEqual(result,P.success(1,'\t'));
		});

	});
});