require 'test_helper'

class ParserTest < Test::Unit::TestCase

  def setup
    @par = Parser.new
  end

  def test_parsing_an_empty_string
    nodes = @par.parse("")
    assert nodes.is_a? Expressions
    assert nodes.expressions.empty?
  end

  def test_parsing_a_basic_assignment
    nodes = @par.parse("a: 'one'").expressions
    assert nodes.length == 1
    assign = nodes.first
    assert assign.is_a? AssignNode
    assert assign.variable.literal == 'a'
  end

  def test_parsing_an_object_literal
    nodes = @par.parse("{one : 1 \n two : 2}").expressions
    obj = nodes.first.literal
    assert obj.is_a? ObjectNode
    assert obj.properties.first.variable == "one"
    assert obj.properties.last.variable == "two"
  end

  def test_parsing_an_function_definition
    code = @par.parse("x, y => x * y.").expressions.first
    assert code.params == ['x', 'y']
    body = code.body.expressions.first
    assert body.is_a? OpNode
    assert body.operator == '*'
  end

  def test_parsing_if_statement
    the_if = @par.parse("clap_your_hands() if happy").expressions.first
    assert the_if.is_a? IfNode
    assert the_if.condition.literal == 'happy'
    assert the_if.body.is_a? CallNode
    assert the_if.body.variable.literal == 'clap_your_hands'
  end

  def test_parsing_array_comprehension
    nodes = @par.parse("i for x, i in [10, 9, 8, 7, 6, 5] if i % 2 is 0.").expressions
    assert nodes.first.is_a? ForNode
    assert nodes.first.body.literal == 'i'
    assert nodes.first.filter.operator == '==='
    assert nodes.first.source.literal.objects.last.value == "5"
  end

  def test_parsing
    nodes = @par.parse(File.read('test/fixtures/each.cs'))
    assign = nodes.expressions.first
    assert assign.is_a? AssignNode
    assert assign.variable.literal == '_'
    assert assign.value.is_a? CodeNode
    assert assign.value.params == ['obj', 'iterator', 'context']
    assert nodes.compile == File.read('test/fixtures/each.js')
  end

end