abstract class TermEscape
# The US-ASCII ESC character.
protected fun esc: Char do return 27.ascii
+
+ # The Control Sequence Introducer (CSI).
+ protected fun csi: String do return "{esc}["
+end
+
+# Abstract class of the ANSI/VT100 escape sequences for directional moves.
+abstract class TermDirectionalMove
+ super TermEscape
+
+ # The length of the move.
+ var magnitude: Int = 1 is protected writable
+
+ redef fun to_s do
+ if magnitude == 1 then return "{csi}{code}"
+ return "{csi}{magnitude}{code}"
+ end
+
+ # The code of the command.
+ protected fun code: String is abstract
+end
+
+# ANSI/VT100 code to move the cursor up by `magnitude` rows (CUU).
+class TermMoveUp
+ super TermDirectionalMove
+
+ # Move by the specified number of cells.
+ init by(magnitude: Int) do self.magnitude = magnitude
+
+ redef fun code do return "A"
+end
+
+# ANSI/VT100 code to move the cursor down by `magnitude` rows (CUD).
+class TermMoveDown
+ super TermDirectionalMove
+
+ # Move by the specified number of cells.
+ init by(magnitude: Int) do self.magnitude = magnitude
+
+ redef fun code do return "B"
+end
+
+# ANSI/VT100 code to move the cursor foward by `magnitude` columns (CUF).
+class TermMoveFoward
+ super TermDirectionalMove
+
+ # Move by the specified number of cells.
+ init by(magnitude: Int) do self.magnitude = magnitude
+
+ redef fun code do return "C"
+end
+
+# ANSI/VT100 code to move the cursor backward by `magnitude` columns (CUB).
+class TermMoveBackward
+ super TermDirectionalMove
+
+ # Move by the specified number of cells.
+ init by(magnitude: Int) do self.magnitude = magnitude
+
+ redef fun code do return "D"
+end
+
+# ANSI/VT100 code to move the cursor at the specified position (CUP).
+class TermMove
+ super TermEscape
+
+ # Vertical position.
+ #
+ # 1 is the top.
+ var row: Int = 1
+
+ # Horizontal position.
+ #
+ # 1 is the left.
+ var column: Int = 1
+
+ # Move at the specified position.
+ #
+ # (1, 1) is the top-left corner of the display.
+ init at(row: Int, column: Int) do
+ self.row = row
+ self.column = column
+ end
+
+ redef fun to_s do
+ if row == 1 then
+ if column == 1 then return "{csi}H"
+ return "{csi};{column}H"
+ else
+ if column == 1 then return "{csi}{row}H"
+ return "{csi}{row};{column}H"
+ end
+ end
+end
+
+# ANSI/VT100 code to clear from the cursor to the end of the screen (ED 0).
+class TermEraseDisplayDown
+ super TermEscape
+ redef fun to_s do return "{csi}J"
+end
+
+# ANSI/VT100 code to clear from the cursor to the beginning of the screen (ED 1).
+class TermEraseDisplayUp
+ super TermEscape
+ redef fun to_s do return "{csi}1J"
+end
+
+# ANSI/VT100 code to clear the entire display and move the cursor to the top left of screen (ED 2).
+#
+# Note: Some terminals always move the cursor when the screen is cleared. So we
+# force this behaviour to ensure interoperability of the code.
+class TermClearDisplay
+ super TermEscape
+ redef fun to_s do return "{csi}2J{csi}H"
+end
+
+# ANSI/VT100 code to erase anything after the cursor in the line (EL 0).
+class TermEraseLineFoward
+ super TermEscape
+ redef fun to_s do return "{csi}K"
+end
+
+# ANSI/VT100 code to erase anything before the cursor in the line (EL 1).
+class TermEraseLineBackward
+ super TermEscape
+ redef fun to_s do return "{csi}1K"
+end
+
+# ANSI/VT100 code to clear everything in the current line (EL 2).
+class TermClearLine
+ super TermEscape
+ redef fun to_s do return "{csi}2K"
+end
+
+# ANSI/VT100 code to save the current cursor position (SCP).
+class TermSaveCursor
+ super TermEscape
+ redef fun to_s do return "{csi}s"
+end
+
+# ANSI/VT100 code to restore the current cursor position (RCP).
+class TermRestoreCursor
+ super TermEscape
+ redef fun to_s do return "{csi}u"
end
-# ANSI/VT100 code to switch character attributes (SGR).
+# ANSI/VT100 code to change character look (SGR).
#
# By default, resets everything to the terminal’s defaults.
#
attributes.add_all(format.attributes)
end
- redef fun to_s: String do return "{esc}[{attributes.join(";")}m"
+ redef fun to_s: String do return "{csi}{attributes.join(";")}m"
# Apply the specified SGR and return `self`.
private fun apply(sgr: String): TermCharFormat do