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99 lines
3.3 KiB
99 lines
3.3 KiB
15 years ago
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The refinement discussed here so far, is implemented in the
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overall structure of the program:
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Operations -------------X
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Screen(s)
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Protocol / |
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Shell X------------X Emulation |
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\ V
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Widget
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Events X------------------
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Part Application Protocol Data model Visualization
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User Events
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Files TEShell.C TEmulation.C Screen.C TEWidget.C
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TEVt102.C
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Types TEShell Emulation TEScreen TEWidget
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The abstract data type, in which the text is represented and
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manipulated by a set of operations is
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------------------------------------------------------------------
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On the first glance, the terminal consists of the following
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parts:
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- A screen to display characters to the user on a rectangular area.
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- A keyboard to accept the user keypresses.
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- A bidirectional serial connection, on which the application
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sends the text to be displayed to the terminal and on which
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the user's key pressed are forwarded to the application.
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- The application that actually run on the terminal.
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More formally our terminal model consists of
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- a character screen : a matrix [Lines,Columns] -> Character
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- a current visual pointer position (cursor).
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- a set of operations by which the screen can be manipulated
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- a set of events (mainly keystrokes)
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- two streams on which bytes are exchanged between the
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application and the terminal which are used to communicate
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the operations and events between the two end points.
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- an initial state.
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0 (columns) V--- Columns-1
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+-----------------------+
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| text on |
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| the screen |
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+-----------------------+
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For adressing purpose, we call the (columnNo,lineNo) pair a "position"
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- protocol == collection of operations and their encoding.
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Beschreibung
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- Strom von Kommandos und Anfragen
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- Strom von Ereignissen und Antworten
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- HostToTerminalStream
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: Sequence(Command U Request)
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- Type Command-Tokens
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: Prn(Char) - literal(Character) - 1 char subset
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: Ctl(Char) - 0-parm command
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: Esc(Char) - 0-parm command
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: Csi(Char,Args) - fix & flex num parm command
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- some are sub-commands
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: Pri(Char,Args) <: Csi("?",Char,Args) - fix & flex num parm command
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- some are sub-commands
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: Hsh(Char) - 0-parm command
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: Scs(A,B) - 2-parm num command
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: Vt5(A,B) - 2-parm num command
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- command definition
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: name(parm:Type<:Integer)
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: setFgColor(color)
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: setBgColor(color)
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: setReverse(bool)
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: setBold(bool)
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: setBlink(bool)
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------------------------------------------------------------------
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