# -*- encoding: binary -*-
require_relative '../../../spec_helper'

describe "Encoding::Converter#primitive_convert" do
  before :each do
    @ec = Encoding::Converter.new("utf-8", "iso-8859-1")
  end

  it "accepts a nil source buffer" do
    -> { @ec.primitive_convert(nil,"") }.should_not raise_error
  end

  it "accepts a String as the source buffer" do
    -> { @ec.primitive_convert("","") }.should_not raise_error
  end

  it "accepts nil for the destination byte offset" do
    -> { @ec.primitive_convert("","", nil) }.should_not raise_error
  end

  it "accepts an integer for the destination byte offset" do
    -> { @ec.primitive_convert("","a", 1) }.should_not raise_error
  end

  it "calls #to_int to convert the destination byte offset" do
    offset = mock("encoding primitive_convert destination byte offset")
    offset.should_receive(:to_int).and_return(2)
    @ec.primitive_convert("abc", result = "   ", offset).should == :finished
    result.should == "  abc"
  end

  it "raises an ArgumentError if the destination byte offset is greater than the bytesize of the destination buffer" do
    -> { @ec.primitive_convert("","am", 0) }.should_not raise_error
    -> { @ec.primitive_convert("","am", 1) }.should_not raise_error
    -> { @ec.primitive_convert("","am", 2) }.should_not raise_error
    -> { @ec.primitive_convert("","am", 3) }.should raise_error(ArgumentError)
  end

  it "uses the destination byte offset to determine where to write the result in the destination buffer" do
    dest = "aa"
    @ec.primitive_convert("b",dest, nil, 0)
    dest.should == "aa"

    @ec.primitive_convert("b",dest, nil, 1)
    dest.should == "aab"

    @ec.primitive_convert("b",dest, nil, 2)
    dest.should == "aabbb"
  end

  it "accepts nil for the destination bytesize" do
    -> { @ec.primitive_convert("","", nil, nil) }.should_not raise_error
  end

  it "accepts an integer for the destination bytesize" do
    -> { @ec.primitive_convert("","", nil, 0) }.should_not raise_error
  end

  it "allows a destination bytesize value greater than the bytesize of the source buffer" do
    -> { @ec.primitive_convert("am","", nil, 3) }.should_not raise_error
  end

  it "allows a destination bytesize value less than the bytesize of the source buffer" do
    -> { @ec.primitive_convert("am","", nil, 1) }.should_not raise_error
  end

  it "calls #to_int to convert the destination byte size" do
    size = mock("encoding primitive_convert destination byte size")
    size.should_receive(:to_int).and_return(2)
    @ec.primitive_convert("abc", result = "   ", 0, size).should == :destination_buffer_full
    result.should == "ab"
  end

  it "uses destination bytesize as the maximum bytesize of the destination buffer" do
    dest = ""
    @ec.primitive_convert("glark", dest, nil, 1)
    dest.bytesize.should == 1
  end

  it "allows a destination buffer of unlimited size if destination bytesize is nil" do
    source = "glark".force_encoding('utf-8')
    dest = ""
    @ec.primitive_convert("glark", dest, nil, nil)
    dest.bytesize.should == source.bytesize
  end

  it "accepts an options hash" do
    @ec.primitive_convert("","",nil,nil, after_output: true).should == :finished
  end

  it "sets the destination buffer's encoding to the destination encoding if the conversion succeeded" do
    dest = "".force_encoding('utf-8')
    dest.encoding.should == Encoding::UTF_8
    @ec.primitive_convert("\u{98}",dest).should == :finished
    dest.encoding.should == Encoding::ISO_8859_1
  end

  it "sets the destination buffer's encoding to the destination encoding if the conversion failed" do
    dest = "".force_encoding('utf-8')
    dest.encoding.should == Encoding::UTF_8
    @ec.primitive_convert("\u{9878}",dest).should == :undefined_conversion
    dest.encoding.should == Encoding::ISO_8859_1
  end

  it "removes the undefined part from the source buffer when returning :undefined_conversion" do
    dest = "".force_encoding('utf-8')
    s = "\u{9878}abcd"
    @ec.primitive_convert(s, dest).should == :undefined_conversion

    s.should == "abcd"
  end

  it "returns :incomplete_input when source buffer ends unexpectedly and :partial_input isn't specified" do
    ec = Encoding::Converter.new("EUC-JP", "ISO-8859-1")
    ec.primitive_convert("\xa4", "", nil, nil, partial_input: false).should == :incomplete_input
  end

  it "clears the source buffer when returning :incomplete_input" do
    ec = Encoding::Converter.new("EUC-JP", "ISO-8859-1")
    s = "\xa4"
    ec.primitive_convert(s, "").should == :incomplete_input

    s.should == ""
  end

  it "returns :source_buffer_empty when source buffer ends unexpectedly and :partial_input is true" do
    ec = Encoding::Converter.new("EUC-JP", "ISO-8859-1")
    ec.primitive_convert("\xa4", "", nil, nil, partial_input: true).should == :source_buffer_empty
  end

  it "clears the source buffer when returning :source_buffer_empty" do
    ec = Encoding::Converter.new("EUC-JP", "ISO-8859-1")
    s = "\xa4"
    ec.primitive_convert(s, "", nil, nil, partial_input: true).should == :source_buffer_empty

    s.should == ""
  end

  it "returns :undefined_conversion when a character in the source buffer is not representable in the output encoding" do
    @ec.primitive_convert("\u{9876}","").should == :undefined_conversion
  end

  it "returns :invalid_byte_sequence when an invalid byte sequence was found in the source buffer" do
    @ec.primitive_convert("\xf1abcd","").should == :invalid_byte_sequence
  end

  it "removes consumed and erroneous bytes from the source buffer when returning :invalid_byte_sequence" do
    ec = Encoding::Converter.new(Encoding::UTF_8, Encoding::UTF_8_MAC)
    s = "\xC3\xA1\x80\x80\xC3\xA1".force_encoding("utf-8")
    dest = "".force_encoding("utf-8")
    ec.primitive_convert(s, dest)

    s.should == "\x80\xC3\xA1".force_encoding("utf-8")
  end

  it "returns :finished when the conversion succeeded" do
    @ec.primitive_convert("glark".force_encoding('utf-8'),"").should == :finished
  end

  it "clears the source buffer when returning :finished" do
    s = "glark".force_encoding('utf-8')
    @ec.primitive_convert(s, "").should == :finished

    s.should == ""
  end

  it "returns :destination_buffer_full when the destination buffer is too small" do
    ec = Encoding::Converter.new("utf-8", "iso-2022-jp")
    source = "\u{9999}"
    destination_bytesize = source.bytesize - 1
    ec.primitive_convert(source, "", 0, destination_bytesize) \
      .should == :destination_buffer_full
    source.should == ""
  end

  it "clears the source buffer when returning :destination_buffer_full" do
    ec = Encoding::Converter.new("utf-8", "iso-2022-jp")
    s = "\u{9999}"
    destination_bytesize = s.bytesize - 1
    ec.primitive_convert(s, "", 0, destination_bytesize).should == :destination_buffer_full

    s.should == ""
  end

  it "keeps removing invalid bytes from the source buffer" do
    ec = Encoding::Converter.new(Encoding::UTF_8, Encoding::UTF_8_MAC)
    s = "\x80\x80\x80"
    dest = "".force_encoding(Encoding::UTF_8_MAC)

    ec.primitive_convert(s, dest)
    s.should == "\x80\x80"
    ec.primitive_convert(s, dest)
    s.should == "\x80"
    ec.primitive_convert(s, dest)
    s.should == ""
  end

  it "reuses read-again bytes after the first error" do
    s = "\xf1abcd"
    dest = ""

    @ec.primitive_convert(s, dest).should == :invalid_byte_sequence
    s.should == "bcd"
    @ec.primitive_errinfo[4].should == "a"

    @ec.primitive_convert(s, dest).should == :finished
    s.should == ""

    dest.should == "abcd"
  end
end