Contents

require 'spec_helper'
require 'dentaku/ast/comparators'

require 'dentaku/token'

describe Dentaku::AST::Comparator do
  let(:one) { Dentaku::AST::Numeric.new Dentaku::Token.new(:numeric, 1) }
  let(:two) { Dentaku::AST::Numeric.new Dentaku::Token.new(:numeric, 2) }
  let(:x) { Dentaku::AST::Identifier.new Dentaku::Token.new(:identifier, 'x') }
  let(:y) { Dentaku::AST::Identifier.new Dentaku::Token.new(:identifier, 'y') }
  let(:ctx) { { 'x' => 'hello', 'y' => 'world' } }

  it 'performs comparison with numeric operands' do
    expect(less_than(one, two).value(ctx)).to be_truthy
    expect(less_than(two, one).value(ctx)).to be_falsey
    expect(greater_than(two, one).value(ctx)).to be_truthy
    expect(not_equal(x, y).value(ctx)).to be_truthy
    expect(equal(x, y).value(ctx)).to be_falsey
  end

  it 'returns correct operator symbols' do
    expect(less_than(one, two).operator).to eq(:<)
    expect(less_than_or_equal(one, two).operator).to eq(:<=)
    expect(greater_than(one, two).operator).to eq(:>)
    expect(greater_than_or_equal(one, two).operator).to eq(:>=)
    expect(not_equal(x, y).operator).to eq(:!=)
    expect(equal(x, y).operator).to eq(:==)
    expect { Dentaku::AST::Comparator.new(one, two).operator }
      .to raise_error(NotImplementedError)
  end

  private

  def less_than(left, right)
    Dentaku::AST::LessThan.new(left, right)
  end

  def less_than_or_equal(left, right)
    Dentaku::AST::LessThanOrEqual.new(left, right)
  end

  def greater_than(left, right)
    Dentaku::AST::GreaterThan.new(left, right)
  end

  def greater_than_or_equal(left, right)
    Dentaku::AST::GreaterThanOrEqual.new(left, right)
  end

  def not_equal(left, right)
    Dentaku::AST::NotEqual.new(left, right)
  end

  def equal(left, right)
    Dentaku::AST::Equal.new(left, right)
  end
end

Version data entries

2 entries across 2 versions & 1 rubygems

Version	Path
dentaku-3.2.0	spec/ast/comparator_spec.rb
dentaku-3.1.0	spec/ast/comparator_spec.rb