require File.expand_path('../../../spec_helper', __FILE__)

ruby_version_is "1.9" do
  describe "String#to_c" do
    it "returns a Complex object" do
      '9'.to_c.should be_an_instance_of(Complex)
    end

    it "understands integers" do
      '20'.to_c.should == Complex(20)
    end

    it "understands negative integers" do
      '-3'.to_c.should == Complex(-3)
    end

    it "understands fractions (numerator/denominator) for the real part" do
      '2/3'.to_c.should == Complex(Rational(2, 3))
    end

    it "understands fractions (numerator/denominator) for the imaginary part" do
      '4+2/3i'.to_c.should == Complex(4, Rational(2, 3))
    end

    it "understands negative fractions (-numerator/denominator) for the real part" do
      '-2/3'.to_c.should == Complex(Rational(-2, 3))
    end

    it "understands negative fractions (-numerator/denominator) for the imaginary part" do
      '7-2/3i'.to_c.should == Complex(7, Rational(-2, 3))
    end

    it "understands floats (a.b) for the real part" do
      '2.3'.to_c.should == Complex(2.3)
    end

    it "understands floats (a.b) for the imaginary part" do
      '4+2.3i'.to_c.should == Complex(4, 2.3)
    end

    it "understands negative floats (-a.b) for the real part" do
      '-2.33'.to_c.should == Complex(-2.33)
    end

    it "understands negative floats (-a.b) for the imaginary part" do
      '7-28.771i'.to_c.should == Complex(7, -28.771)
    end

    it "understands an integer followed by 'i' to mean that integer is the imaginary part" do
      '35i'.to_c.should == Complex(0,35)
    end

    it "understands a negative integer followed by 'i' to mean that negative integer is the imaginary part" do
      '-29i'.to_c.should == Complex(0,-29)
    end

    it "understands an 'i' by itself as denoting a complex number with an imaginary part of 1" do
      'i'.to_c.should == Complex(0,1)
    end

    it "understands a '-i' by itself as denoting a complex number with an imaginary part of -1" do
      '-i'.to_c.should == Complex(0,-1)
    end

    it "understands 'a+bi' to mean a complex number with 'a' as the real part, 'b' as the imaginary" do
      '79+4i'.to_c.should == Complex(79,4)
    end

    it "understands 'a-bi' to mean a complex number with 'a' as the real part, '-b' as the imaginary" do
      '79-4i'.to_c.should == Complex(79,-4)
    end

    it "understands scientific notation for the real part" do
      '2e3+4i'.to_c.should == Complex(2e3,4)
    end

    it "understands negative scientific notation for the real part" do
      '-2e3+4i'.to_c.should == Complex(-2e3,4)
    end

    it "understands scientific notation for the imaginary part" do
      '4+2e3i'.to_c.should == Complex(4, 2e3)
    end

    it "understands negative scientific notation for the imaginary part" do
      '4-2e3i'.to_c.should == Complex(4, -2e3)
    end
    
    it "understands scientific notation for the real and imaginary part in the same String" do
      '2e3+2e4i'.to_c.should == Complex(2e3,2e4)
    end

    it "understands negative scientific notation for the real and imaginary part in the same String" do
      '-2e3-2e4i'.to_c.should == Complex(-2e3,-2e4)
    end
    
    it "returns a complex number with 0 as the real part, 0 as the imaginary part for unrecognised Strings" do
    'ruby'.to_c.should == Complex(0,0)
    end
  end
end
