# -*- encoding: utf-8 -*-
require_relative '../../spec_helper'
require_relative 'fixtures/classes'

describe "String#ascii_only?" do
  describe "with ASCII only characters" do
    it "returns true if the encoding is UTF-8" do
      [ ["hello",                         true],
        ["hello".encode('UTF-8'),         true],
        ["hello".dup.force_encoding('UTF-8'), true],
      ].should be_computed_by(:ascii_only?)
    end

    it "returns true if the encoding is US-ASCII" do
      "hello".dup.force_encoding(Encoding::US_ASCII).ascii_only?.should be_true
      "hello".encode(Encoding::US_ASCII).ascii_only?.should be_true
    end

    it "returns true for all single-character UTF-8 Strings" do
      0.upto(127) do |n|
        n.chr.ascii_only?.should be_true
      end
    end
  end

  describe "with non-ASCII only characters" do
    it "returns false if the encoding is BINARY" do
      chr = 128.chr
      chr.encoding.should == Encoding::BINARY
      chr.ascii_only?.should be_false
    end

    it "returns false if the String contains any non-ASCII characters" do
      [ ["\u{6666}",                          false],
        ["hello, \u{6666}",                   false],
        ["\u{6666}".encode('UTF-8'),          false],
        ["\u{6666}".dup.force_encoding('UTF-8'),  false],
      ].should be_computed_by(:ascii_only?)
    end

    it "returns false if the encoding is US-ASCII" do
      [ ["\u{6666}".dup.force_encoding(Encoding::US_ASCII),         false],
        ["hello, \u{6666}".dup.force_encoding(Encoding::US_ASCII),  false],
      ].should be_computed_by(:ascii_only?)
    end
  end

  it "returns true for the empty String with an ASCII-compatible encoding" do
    "".ascii_only?.should be_true
    "".encode('UTF-8').ascii_only?.should be_true
  end

  it "returns false for the empty String with a non-ASCII-compatible encoding" do
    "".dup.force_encoding('UTF-16LE').ascii_only?.should be_false
    "".encode('UTF-16BE').ascii_only?.should be_false
  end

  it "returns false for a non-empty String with non-ASCII-compatible encoding" do
    "\x78\x00".dup.force_encoding("UTF-16LE").ascii_only?.should be_false
  end

  it "returns false when interpolating non ascii strings" do
    base = "EU currency is".dup.force_encoding(Encoding::US_ASCII)
    euro = "\u20AC"
    interp = "#{base} #{euro}"
    euro.ascii_only?.should be_false
    base.ascii_only?.should be_true
    interp.ascii_only?.should be_false
  end

  it "returns false after appending non ASCII characters to an empty String" do
    ("".dup << "λ").ascii_only?.should be_false
  end

  it "returns false when concatenating an ASCII and non-ASCII String" do
    "".dup.concat("λ").ascii_only?.should be_false
  end

  it "returns false when replacing an ASCII String with a non-ASCII String" do
    "".dup.replace("λ").ascii_only?.should be_false
  end
end
