botlang / botlang-js

'use strict';

import { assert } from 'chai';

import Input from '../../src/Lexer/Input';

import pkg from '../../package.json';

/** @test {Input} */

describe(`${pkg.name}/Lexer/Input`, () => {

  /** @test {Input#constructor} */

  describe('#constructor', () => {

    it('Create a new instance of type Input', () => {

      assert.instanceOf(new Input(''), Input);

    });

  });

  /** @test {Input#eof} */

  describe('#eof', () => {

    it('Determine whether or not there are no more values in the stream.', () => {

      const stream = new Input('');

      assert.isTrue(stream.eof());

    });

  });

  /** @test {Input#error} */

  describe('#error', () => {

    it('Throw a new Error.', () => {

      const stream = new Input('');

      assert.throws(() => {

        stream.error('Parse error');

      }, Error, 'Parse error (Line: 1, Column: 0)');

    });

  });

  /** @test {Input#next} */

  describe('#next', () => {

    it('Return the next value from the stream.', () => {

      const stream = new Input('> hello botlang');

      assert.strictEqual(stream.next(), ' ');

      assert.strictEqual(stream.next(), 'h');

      assert.strictEqual(stream.next(), 'e');

      assert.strictEqual(stream.next(), 'l');

      assert.strictEqual(stream.next(), 'l');

      assert.strictEqual(stream.next(), 'o');

      assert.strictEqual(stream.next(), ' ');

      assert.strictEqual(stream.next(), 'b');

      assert.strictEqual(stream.next(), 'o');

      assert.strictEqual(stream.next(), 't');

      assert.strictEqual(stream.next(), 'l');

      assert.strictEqual(stream.next(), 'a');

      assert.strictEqual(stream.next(), 'n');

      assert.strictEqual(stream.next(), 'g');

    });

  });

  /** @test {Input#peek} */

  describe('#peek', () => {

    it('Return the value from the current position.', () => {

      const stream = new Input('> hello botlang');

      assert.strictEqual(stream.peek(), '>');

    });

  });

});