@litexa/core/test/specs/parser/utils.spec.coffee

Litexa, a programming language for writing Alexa skills

###
# ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
# Copyright 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
# SPDX-License-Identifier: Apache-2.0
# ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
###

Utils = require('@src/parser/utils').lib
{assert, expect} = require('chai')

describe 'performs string manipulation and checking functions', ->

  it 'trims line breaks', ->
    expect(Utils.replaceNewlineCharacters(null)).to.equal('')
    expect(Utils.replaceNewlineCharacters('hello\nmy name is Ellie', ', ')).to.equal('hello, my name is Ellie')
    expect(Utils.replaceNewlineCharacters('I have a dog', 'meow')).to.equal('I have a dog')

  it 'indicates whether or not a string does not contain non-whitespace text', ->
    assert(Utils.isEmptyContentString(''), 'empty string returns true')
    assert(Utils.isEmptyContentString(' \t\n'), 'whitespace string returns true')
    assert(!Utils.isEmptyContentString(' meow\n'), 'non-empty string returns false')

  it 'indicates if the given index is the first or last index of the given array', ->
    someArr = [500,12,'fish','cat']
    assert(Utils.isFirstOrLastItemOfArray(0, someArr), 'first index returns true')
    assert(!Utils.isFirstOrLastItemOfArray(1, someArr), 'idx in the middle returns false')
    assert(!Utils.isFirstOrLastItemOfArray(-2, someArr), 'negative idx returns false')
    assert(Utils.isFirstOrLastItemOfArray(3, someArr), 'last index returns true')
    assert(!Utils.isFirstOrLastItemOfArray(4, someArr), 'idx > array length returns false')

  it 'deletes leading whitespace for lines', ->
    expect(Utils.cleanLeadingSpaces("""I have a cute cat.
      Her name is Ellie.
      Ellie demands to be petted.
      \tMeow.""")).to.equal('I have a cute cat.\nHer name is Ellie.\nEllie demands to be petted.\nMeow.')
    expect(Utils.cleanLeadingSpaces('Hello hello.\n Hi hi. \nMeow. \t')).to.equal('Hello hello.\nHi hi. \nMeow. \t')

  it 'deletes trailing whitespace for lines', ->
    expect(Utils.cleanTrailingSpaces('Hello hello.\n Hi hi. \nMeow. \t')).to.equal('Hello hello.\n Hi hi.\nMeow. \t')

  it 'dedupes whitespace for each line', ->
    expect(Utils.dedupeNonNewlineConsecutiveWhitespaces('Hello hello.\n Hi hi. \nMeow. \t')).to.equal('Hello hello.\n Hi hi. \nMeow. ')
    expect(Utils.dedupeNonNewlineConsecutiveWhitespaces('  M e o o\to   w www w w  w\t\t\t  \t \thi.')).to.equal(' M e o o\to w www w w w hi.')

  it 'stringifies a function with expected indent normalization', ->
    func = () ->
      return {
        test: 'This is a test.'
      }

    expectedFuncString = "function() {\n  return {\n    test: 'This is a test.'\n  };\n}"
    expect(Utils.stringifyFunction(func)).to.equal(expectedFuncString)

    indent = '  '
    expectedFuncString = "function() {\n    return {\n      test: 'This is a test.'\n    };\n  }"
    expect(Utils.stringifyFunction(func, indent)).to.equal(expectedFuncString)