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-- File: Interface_LineBuffer.cdl
-- Created: Thu Apr 15 10:08:17 1993
-- Author: Christian CAILLET
-- <cky@bravox>
---Copyright: Matra Datavision 1993
class LineBuffer from Interface
---Purpose : Simple Management of a Line Buffer, to be used by Interface
-- File Writers.
-- While a String is suitable to do that, this class ensures an
-- optimised Memory Management, because this is a hard point of
-- File Writing.
uses Integer, Boolean, Character, CString,
AsciiString from TCollection, HAsciiString from TCollection
raises OutOfRange
is
Create (size : Integer = 10) returns LineBuffer;
---Purpose : Creates a LineBuffer with an absolute maximum size
-- (Default value is only to satisfy compiler requirement)
SetMax (me : in out; max : Integer)
---Purpose : Changes Maximum allowed size of Buffer.
-- If <max> is Zero, Maximum size is set to the initial size.
raises OutOfRange is static;
-- Error if <max> is greater than <size> given at Creation time.
SetInitial (me : in out; initial : Integer)
---Purpose : Sets an Initial reservation for Blank characters
-- (this reservation is counted in the size of the current Line)
raises OutOfRange is static;
-- Error if <initial> is greater than current Maximum size
SetKeep (me : in out) is static;
---Purpose : Sets a Keep Status at current Length. It means that at next
-- Move, the new line will begin by characters between Keep + 1
-- and current Length
CanGet (me : in out; more : Integer) returns Boolean is static;
---Purpose : Returns True if there is room enough to add <more> characters
-- Else, it is required to Dump the Buffer before refilling it
-- <more> is recorded to manage SetKeep status
Content (me) returns CString is static;
---Purpose : Returns the Content of the LineBuffer
-- was C++ : return const
Length (me) returns Integer is static;
---Purpose : Returns the Length of the LineBuffer
Clear (me : in out) is static;
---Purpose : Clears completely the LineBuffer
FreezeInitial (me : in out) is static;
---Purpose : Inhibits effect of SetInitial until the next Move (i.e. Keep)
-- Then Prepare will not insert initial blanks, but further ones
-- will. This allows to cancel initial blanks on an internal Split
-- A call to SetInitial has no effect on this until Move
Prepare (me : in out) is static private;
---Purpose : Prepares Move : Inserts Initial Blanks if required, and
-- determines if SetKeep can be supported (it cannot be if Length
-- + Next String to get (see CanGet) overpass Max Size)
Keep (me : in out) is static private;
---Purpose : Keeps characters from SetKeep. If SetKeep is Zero, equivalent
-- to Clear
Move (me : in out; str : in out AsciiString from TCollection) is static;
---Purpose : Fills a AsciiString <str> with the Content of the Line Buffer,
-- then Clears the LineBuffer
Move (me : in out; str : mutable HAsciiString from TCollection) is static;
---Purpose : Same as above, but <str> is known through a Handle
Moved (me : in out) returns mutable HAsciiString from TCollection;
---Purpose : Same as above, but generates the HAsciiString
Add (me : in out; text : CString)
---Purpose : Adds a text as a CString. Its Length is evaluated from the
-- text (by C function strlen)
raises OutOfRange is static;
-- Error if there remains no room enough
Add (me : in out; text : CString; lntext : Integer)
---Purpose : Adds a text as a CString. Its length is given as <lntext>
raises OutOfRange is static;
-- Error if there remains no room enough
Add (me : in out; text : AsciiString from TCollection)
---Purpose : Adds a text as a AsciiString from TCollection
raises OutOfRange is static;
-- Error if there remains no room enough
Add (me : in out; text : Character)
---Purpose : Adds a text made of only ONE Character
raises OutOfRange is static;
-- Error if there remains no room enough
fields
theline : AsciiString from TCollection;
themax : Integer;
theinit : Integer;
thekeep : Integer;
theget : Integer;
thelen : Integer;
thefriz : Integer;
thekept : Character;
end LineBuffer;
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