test_source_buffer.rb

# frozen_string_literal: true

require 'helper'

class TestSourceBuffer < Minitest::Test
  def setup
    @buffer = Parser::Source::Buffer.new('(string)')
  end

  def test_initialize
    buffer = Parser::Source::Buffer.new(nil)
    assert_equal '', buffer.name

    buffer = Parser::Source::Buffer.new(Pathname('a/b'))
    assert_equal 'a/b', buffer.name

    buffer = Parser::Source::Buffer.new('(string)')
    assert_equal '(string)', buffer.name
    assert_equal 1, buffer.first_line

    buffer = Parser::Source::Buffer.new('(string)', 5)
    assert_equal 5, buffer.first_line
  end

  def test_source_setter
    @buffer.source = 'foo'
    assert_equal 'foo', @buffer.source

    assert @buffer.source.frozen?
  end

  def test_source_double_setter
    @buffer.source = 'foo'

    assert_raises(ArgumentError) do
      @buffer.source = 'bar'
    end
  end

  def test_source_setter_encoding_error
    error = assert_raises EncodingError do
      @buffer.source = [
        '# encoding: utf-8',
        "# \xf9"
      ].join("\n")
    end

    assert_match(/invalid byte sequence in UTF\-8/, error.message)
  end

  def test_read
    tempfile = Tempfile.new('parser')
    tempfile.write('foobar')
    tempfile.flush

    buffer = Parser::Source::Buffer.new(tempfile.path)
    buffer.read
    assert_equal 'foobar', buffer.source

    assert buffer.source.frozen?
  end

  def test_uninitialized
    assert_raises RuntimeError do
      @buffer.source
    end
  end

  def test_decompose_position
    @buffer.source = "1\nfoo\nbar"

    assert_equal [1, 0], @buffer.decompose_position(0)
    assert_equal [1, 1], @buffer.decompose_position(1)
    assert_equal [2, 0], @buffer.decompose_position(2)
    assert_equal [3, 1], @buffer.decompose_position(7)
  end

  def test_decompose_position_mapped
    @buffer = Parser::Source::Buffer.new('(string)', 5)
    @buffer.source = "1\nfoo\nbar"

    assert_equal [5, 0], @buffer.decompose_position(0)
    assert_equal [6, 0], @buffer.decompose_position(2)
  end

  def test_line
    @buffer.source = "1\nfoo\nbar"

    assert_equal '1', @buffer.source_line(1)
    assert_equal 'foo', @buffer.source_line(2)
  end

  def test_line_mutate
    @buffer.source = "1\nfoo\nbar"

    assert_equal '1', @buffer.source_line(1)

    @buffer.source_line(1)[0] = '2'
    assert_equal '1', @buffer.source_line(1)
  end

  def test_line_mapped
    @buffer = Parser::Source::Buffer.new('(string)', 5)
    @buffer.source = "1\nfoo\nbar"

    assert_equal '1', @buffer.source_line(5)
    assert_equal 'foo', @buffer.source_line(6)
  end

  def test_line_range
    @buffer = Parser::Source::Buffer.new('(string)', 5)
    @buffer.source = "abc\ndef\nghi\n"

    assert_raises IndexError do
      @buffer.line_range(4)
    end
    assert_equal 'abc', @buffer.line_range(5).source
    assert_equal 'def', @buffer.line_range(6).source
    assert_equal 'ghi', @buffer.line_range(7).source
    assert_equal '', @buffer.line_range(8).source
    assert_raises IndexError do
      @buffer.line_range(9)
    end
  end

  def test_source_range
    @buffer = Parser::Source::Buffer.new('(string)', 5)

    assert_raises RuntimeError do
      @buffer.source_range
    end

    @buffer.source = "abc\ndef\nghi\n"

    assert_equal Parser::Source::Range.new(@buffer, 0, @buffer.source.size), @buffer.source_range
  end

  def test_last_line
    @buffer.source = "1\nfoo\nbar"
    assert_equal 3, @buffer.last_line

    @buffer = Parser::Source::Buffer.new('(string)', 5)
    @buffer.source = ""
    assert_equal 5, @buffer.last_line

    @buffer = Parser::Source::Buffer.new('(string)', 5)
    @buffer.source = "abc\n"
    assert_equal 6, @buffer.last_line
  end

  def test_source_lines
    @buffer.source = "1\nfoo\nbar\n"

    assert_equal ['1', 'foo', 'bar', ''], @buffer.source_lines
    assert @buffer.source_lines.frozen?
    assert @buffer.source_lines.all?(&:frozen?)

    @buffer = Parser::Source::Buffer.new('(string)', 5)
    @buffer.source = "foo\nbar"
    assert_equal ['foo', 'bar'], @buffer.source_lines
  end
end