void Position_points_at_0_0_when_begin()
{
var reader = new SourceStringReader(" \t \r \n \r ");
Assert.Equal(0, reader.Position.Line);
Assert.Equal(0, reader.Position.Column);
}
void NextSecond_return_second()
{
var reader = new SourceStringReader("abc");
reader.Advance();
Assert.Equal('b', reader.CurrentChar());
}
void PeekAtStart_return_first()
{
var reader = new SourceStringReader("abc");
var c = reader.CurrentChar();
Assert.Equal('a', c);
}
void PeekAfterOneNext_return_second()
{
var reader = new SourceStringReader("abc");
reader.Advance();
var c = reader.CurrentChar();
Assert.Equal('b', c);
}
void PrevioutPositionTest()
{
var reader = new SourceStringReader("io");
reader.Advance();
Assert.Equal(0, reader.PreviousPosition.Column);
Assert.Equal(0, reader.PreviousPosition.Line);
}
void Position_column_increases_when_next()
{
var reader = new SourceStringReader("abc");
reader.Advance();
Assert.Equal(0, reader.Position.Line);
Assert.Equal(1, reader.Position.Column);
}
void NextNonWhiteChar_at_start()
{
var reader = new SourceStringReader(" \t \r abc");
var success = reader.AdvanceUntilNonWhite();
Assert.True(success);
Assert.Equal('a', reader.CurrentChar());
}
void NextAtEnd_throws()
{
var reader = new SourceStringReader("abc");
reader.Advance();
reader.Advance();
reader.Advance();
Assert.Throws <InvalidOperationException>(() => reader.Advance());
}
void PeekAtTheEOF_throws()
{
var reader = new SourceStringReader("abc");
reader.Advance();
reader.Advance();
reader.Advance();
Assert.Throws <InvalidOperationException>(() => reader.CurrentChar());
}
void Position_column_set_0_and_line_incr_1()
{
var source = "ab\nasd";
var reader = new SourceStringReader(source);
reader.Advance(); // a
reader.Advance(); // b
reader.Advance(); // This reads \n
Assert.Equal(0, reader.Position.Column);
Assert.Equal(1, reader.Position.Line);
}
void NextNonWhiteChar_returns_false_when_no_more_nonwhite()
{
var reader = new SourceStringReader(" \t \r \n \r ");
Assert.False(reader.AdvanceUntilNonWhite());
}
void NextAtStart_return_first()
{
var reader = new SourceStringReader("abc");
Assert.Equal('a', reader.CurrentChar());
}
