require_relative '../../spec_helper'
require_relative '../../shared/kernel/complex'
require_relative 'fixtures/to_c'

describe "String#to_c" do
  it_behaves_like :kernel_complex, :to_c_method, StringSpecs
end

describe "String#to_c" do
  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

  it "ignores trailing garbage" do
    '79+4iruby'.to_c.should == Complex(79, 4)
    '7__9+4__0i'.to_c.should == Complex(7, 0)
  end

  context "it treats special float value strings as characters" do
    it "parses any string that starts with 'I' as 1i" do
      'Infinity'.to_c.should == Complex(0, 1)
      '-Infinity'.to_c.should == Complex(0, -1)
      'Insecure'.to_c.should == Complex(0, 1)
      '-Insecure'.to_c.should == Complex(0, -1)
    end

    it "does not parse any numeric information in 'NaN'" do
      'NaN'.to_c.should == Complex(0, 0)
    end
  end

  it "allows null-byte" do
    "1-2i\0".to_c.should == Complex(1, -2)
    "1\0-2i".to_c.should == Complex(1, 0)
    "\01-2i".to_c.should == Complex(0, 0)
  end

  it "raises Encoding::CompatibilityError if String is in not ASCII-compatible encoding" do
    NATFIXME 'Add encoder to to UTF-16', exception: SpecFailedException, message: /code converter not found \(UTF-8 to UTF-16\)/ do
      -> {
        '79+4i'.encode("UTF-16").to_c
      }.should raise_error(Encoding::CompatibilityError, "ASCII incompatible encoding: UTF-16")
    end
  end

  it "treats a sequence of underscores as an end of Complex string" do
    "5+3_1i".to_c.should == Complex(5, 31)
    "5+3__1i".to_c.should == Complex(5)
    "5+3___1i".to_c.should == Complex(5)

    "12_3".to_c.should == Complex(123)
    "12__3".to_c.should == Complex(12)
    "12___3".to_c.should == Complex(12)
  end
end
