def test_DECBI_Scrolls(self):
strings = [ "abcde",
"fghij",
"klmno",
"pqrst",
"uvwxy" ]
y = 3
for s in strings:
esccmd.CUP(Point(2, y))
escio.Write(s)
y += 1
esccmd.DECSET(esccmd.DECLRMM)
esccmd.DECSLRM(3, 5)
esccmd.DECSTBM(4, 6)
esccmd.CUP(Point(3, 5))
esccmd.DECBI()
AssertScreenCharsInRectEqual(Rect(2, 3, 6, 7),
[ "abcde",
"f" + blank() + "ghj",
"k" + blank() + "lmo",
"p" + blank() + "qrt",
"uvwxy" ])
def test_DECBI_WholeScreenScrolls(self):
"""The spec is confusing and contradictory. It first says "If the cursor is
at the left margin, then all screen data within the margin moves one column
to the right" and then says "DECBI is not affected by the margins." I don't
know what they could mean by the second part."""
escio.Write("x")
esccmd.CUP(Point(1, 1))
esccmd.DECBI()
AssertScreenCharsInRectEqual(Rect(1, 1, 2, 1), [ blank() + "x" ])
def test_DECBI_LeftOfMargin(self):
"""Test DECBI (back-index) when the cursor is before the left-margin.
DEC STD 070 says DECBI can move when outside the margins."""
esccmd.DECSET(esccmd.DECLRMM)
esccmd.DECSLRM(3, 5)
esccmd.CUP(Point(2, 1))
esccmd.DECBI()
AssertEQ(GetCursorPosition(), Point(1, 1))
def test_DECBI_WholeScreenScrolls(self):
"""Test DECBI (back-index) when the cursor is before the left-margin, but
at the left edge of the screen.
Refer to DEC STD 070, which says if the cursor is outside the margins,
at the left edge of the page (which xterm equates with its screen),
the command is ignored."""
escio.Write("x")
esccmd.CUP(Point(1, 1))
esccmd.DECBI()
AssertScreenCharsInRectEqual(Rect(1, 1, 2, 1), [blank() + "x"])
def test_DECBI_Basic(self): esccmd.CUP(Point(5, 6)) esccmd.DECBI() AssertEQ(GetCursorPosition(), Point(4, 6))
def test_DECBI_LeftOfMargin(self): esccmd.DECSET(esccmd.DECLRMM) esccmd.DECSLRM(3, 5) esccmd.CUP(Point(2, 1)) esccmd.DECBI() AssertEQ(GetCursorPosition(), Point(1, 1))
def test_DECBI_NoWrapOnLeftEdge(self): esccmd.CUP(Point(1, 2)) esccmd.DECBI() AssertEQ(GetCursorPosition(), Point(1, 2))
