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521 lines
12 KiB
PHP
521 lines
12 KiB
PHP
{
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$Id$
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This file is part of the Free Pascal run time library.
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Copyright (c) 1999-2000 by Florian Klaempfl,
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member of the Free Pascal development team.
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This file implements support routines for WideStrings with FPC
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See the file COPYING.FPC, included in this distribution,
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for details about the copyright.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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**********************************************************************}
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{
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This file contains the implementation of the WideString type,
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and all things that are needed for it.
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WideString is defined as a 'silent' pwidechar :
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a pwidechar that points to :
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@-12 : Longint for maximum size;
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@-8 : Longint for size;
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@-4 : Longint for reference count;
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@ : String + Terminating #0;
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Pwidechar(Widestring) is a valid typecast.
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So WS[i] is converted to the address @WS+i-1.
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Constants should be assigned a reference count of -1
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Meaning that they can't be disposed of.
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}
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Type
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PWideRec = ^TWideRec;
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TWideRec = Packed Record
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Maxlen,
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len,
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ref : Longint;
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First : WideChar;
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end;
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Const
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WideRecLen = SizeOf(TWideRec);
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WideFirstOff = SizeOf(TWideRec)-1;
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(*
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Procedure UniqueWideString(Var S : WideString); [Public,Alias : 'FPC_WIDESTR_UNIQUE'];
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{
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Make sure reference count of S is 1,
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using copy-on-write semantics.
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}
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begin
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end;
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*)
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{****************************************************************************
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Internal functions, not in interface.
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****************************************************************************}
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{$ifdef WideStrDebug}
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Procedure DumpWideRec(S : Pointer);
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begin
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If S=Nil then
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Writeln ('String is nil')
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Else
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Begin
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With PWideRec(S-WideFirstOff)^ do
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begin
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Write ('(Maxlen: ',maxlen);
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Write (' Len:',len);
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Writeln (' Ref: ',ref,')');
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end;
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end;
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end;
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{$endif}
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Function NewWideString(Len : Longint) : Pointer;
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{
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Allocate a new WideString on the heap.
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initialize it to zero length and reference count 1.
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}
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Var
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P : Pointer;
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begin
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{ Also add +1 for a terminating zero }
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GetMem(P,Len+Len+WideRecLen);
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If P<>Nil then
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begin
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PWideRec(P)^.Maxlen:=Len; { Maximal length }
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PWideRec(P)^.Len:=0; { Initial length }
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PWideRec(P)^.Ref:=1; { Set reference count }
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PWideRec(P)^.First:=#0; { Terminating #0 }
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P:=P+WideFirstOff; { Points to string now }
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end;
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NewWideString:=P;
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end;
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Procedure DisposeWideString(Var S : Pointer);
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{
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Deallocates a WideString From the heap.
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}
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begin
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If S=Nil then
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exit;
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Dec (Longint(S),WideFirstOff);
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FreeMem (S);
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S:=Nil;
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end;
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Procedure WideStr_Decr_Ref (Var S : Pointer);[Public,Alias:'FPC_WIDESTR_DECR_REF'];
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{
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Decreases the ReferenceCount of a non constant widestring;
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If the reference count is zero, deallocate the string;
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}
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Type
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plongint = ^longint;
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Var
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l : plongint;
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Begin
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{ Zero string }
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If S=Nil then exit;
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{ check for constant strings ...}
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l:=@PWIDEREC(S-WideFirstOff)^.Ref;
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If l^<0 then exit;
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Dec(l^);
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If l^=0 then
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{ Ref count dropped to zero }
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DisposeWideString (S); { Remove...}
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{ this pointer is not valid anymore, so set it to zero }
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S:=nil;
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end;
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Procedure WideStr_Incr_Ref (Var S : Pointer);[Public,Alias:'FPC_WIDESTR_INCR_REF'];
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Begin
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If S=Nil then
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exit;
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{ Let's be paranoid : Constant string ??}
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If PWideRec(S-WideFirstOff)^.Ref<0 then exit;
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Inc(PWideRec(S-WideFirstOff)^.Ref);
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end;
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Procedure WideStr_Assign (Var S1 : Pointer;S2 : Pointer);[Public,Alias:'FPC_WIDESTR_ASSIGN'];
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{
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Assigns S2 to S1 (S1:=S2), taking in account reference counts.
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}
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begin
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If S2<>nil then
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If PWideRec(S2-WideFirstOff)^.Ref>0 then
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Inc(PWideRec(S2-WideFirstOff)^.ref);
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{ Decrease the reference count on the old S1 }
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widestr_decr_ref (S1);
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{ And finally, have S1 pointing to S2 (or its copy) }
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S1:=S2;
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end;
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Procedure WideStr_Concat (S1,S2 : Pointer;var S3 : Pointer);[Public, alias: 'FPC_WIDESTR_CONCAT'];
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{
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Concatenates 2 WideStrings : S1+S2.
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Result Goes to S3;
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}
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Var
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Size,Location : Longint;
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begin
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{ create new result }
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if S3<>nil then
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WideStr_Decr_Ref(S3);
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{ only assign if s1 or s2 is empty }
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if (S1=Nil) then
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WideStr_Assign(S3,S2)
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else
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if (S2=Nil) then
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WideStr_Assign(S3,S1)
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else
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begin
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Size:=PWideRec(S2-WideFirstOff)^.Len;
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Location:=Length(WideString(S1));
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SetLength (WideString(S3),Size+Location);
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Move (S1^,S3^,Location);
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Move (S2^,(S3+location)^,Size+1);
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end;
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end;
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(* !!!:
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Procedure Char_To_WideStr(var S1 : Pointer; c : Char);[Public, alias: 'FPC_CHAR_TO_WIDESTR'];
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{
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Converts a ShortString to a WideString;
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}
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begin
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Setlength (WideString(S1),1);
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PByte(Pointer(S1))^:=byte(c);
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{ Terminating Zero }
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PByte(Pointer(S1)+1)^:=0;
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end;
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Procedure PChar_To_WideStr(var a : widestring;p : pchar);[Public,Alias : 'FPC_PCHAR_TO_WIDESTR'];
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Var
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L : Longint;
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begin
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if pointer(a)<>nil then
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begin
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WideStr_Decr_Ref(Pointer(a));
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pointer(a):=nil;
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end;
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if (not assigned(p)) or (p[0]=#0) Then
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Pointer(a):=nil
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else
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begin
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//!! Horribly inneficient, but I see no other way...
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L:=1;
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While P[l]<>#0 do
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inc (l);
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Pointer(a):=NewWidestring(L);
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SetLength(A,L);
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Move (P[0],Pointer(A)^,L)
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end;
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end;
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Procedure CharArray_To_WideStr(var a : widestring;p : pchar;l:longint);[Public,Alias : 'FPC_CHARARRAY_TO_WIDESTR'];
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var
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i : longint;
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hp : pchar;
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begin
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if p[0]=#0 Then
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Pointer(a):=nil
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else
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begin
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Pointer(a):=NewWidestring(L);
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hp:=p;
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i:=0;
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while (i<l) and (hp^<>#0) do
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begin
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inc(hp);
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inc(i);
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end;
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SetLength(A,i);
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Move (P[0],Pointer(A)^,i)
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end;
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end;
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*)
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Function WideStr_Compare(S1,S2 : Pointer): Longint;[Public,Alias : 'FPC_WIDESTR_COMPARE'];
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{
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Compares 2 WideStrings;
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The result is
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<0 if S1<S2
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0 if S1=S2
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>0 if S1>S2
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}
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Var
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i,MaxI,Temp : Longint;
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begin
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i:=0;
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Maxi:=Length(WideString(S1));
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temp:=Length(WideString(S2));
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If MaxI>Temp then
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MaxI:=Temp;
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Temp:=0;
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While (i<MaxI) and (Temp=0) do
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begin
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Temp:= PWord(S1+I)^ - PWord(S2+i)^;
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inc(i);
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end;
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if temp=0 then
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temp:=Length(WideString(S1))-Length(WideString(S2));
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WideStr_Compare:=Temp;
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end;
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Procedure WideStr_CheckZero(p : pointer);[Public,Alias : 'FPC_WIDESTR_CHECKZERO'];
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begin
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if p=nil then
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HandleErrorFrame(201,get_frame);
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end;
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Procedure WideStr_CheckRange(len,index : longint);[Public,Alias : 'FPC_WIDESTR_RANGECHECK'];
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begin
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if (index>len) or (Index<1) then
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HandleErrorFrame(201,get_frame);
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end;
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{$ifndef INTERNSETLENGTH}
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Procedure SetLength (Var S : WideString; l : Longint);
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{$else INTERNSETLENGTH}
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Procedure WideStr_SetLength (Var S : WideString; l : Longint);[Public,Alias : 'FPC_WIDESTR_SETLENGTH'];
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{$endif INTERNSETLENGTH}
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{
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Sets The length of string S to L.
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Makes sure S is unique, and contains enough room.
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}
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Var
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Temp : Pointer;
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begin
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if (l>0) then
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begin
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if Pointer(S)=nil then
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begin
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{ Need a complete new string...}
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Pointer(s):=NewWideString(l);
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end
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else
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If (PWideRec(Pointer(S)-WideFirstOff)^.Maxlen < L) or
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(PWideRec(Pointer(S)-WideFirstOff)^.Ref <> 1) then
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begin
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{ Reallocation is needed... }
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Temp:=Pointer(NewWideString(L));
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if Length(S)>0 then
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Move(Pointer(S)^,Temp^,L+L);
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ansistr_decr_ref(Pointer(S));
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Pointer(S):=Temp;
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end;
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{ Force nil termination in case it gets shorter }
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PByte(Pointer(S)+l)^:=0;
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PWideRec(Pointer(S)-WideFirstOff)^.Len:=l;
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end
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else
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begin
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{ Length=0 }
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if Pointer(S)<>nil then
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ansistr_decr_ref (Pointer(S));
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Pointer(S):=Nil;
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end;
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end;
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{*****************************************************************************
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Public functions, In interface.
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*****************************************************************************}
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Function Length (Const S : WideString) : Longint;
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{
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Returns the length of an WideString.
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Takes in acount that zero strings are NIL;
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}
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begin
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If Pointer(S)=Nil then
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Length:=0
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else
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Length:=PWideRec(Pointer(S)-WideFirstOff)^.Len;
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end;
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Procedure UniqueString(Var S : WideString); [Public,Alias : 'FPC_WIDESTR_UNIQUE'];
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{
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Make sure reference count of S is 1,
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using copy-on-write semantics.
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}
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Var
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SNew : Pointer;
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begin
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If Pointer(S)=Nil then
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exit;
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if PWideRec(Pointer(S)-WideFirstOff)^.Ref<>1 then
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begin
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SNew:=NewWideString (PWideRec(Pointer(S)-WideFirstOff)^.len);
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Move (Pointer(S)^,SNew^,(PWideRec(Pointer(S)-WideFirstOff)^.len+1)*2);
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PWideRec(SNew-WideFirstOff)^.len:=PWideRec(Pointer(S)-WideFirstOff)^.len;
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ansistr_decr_ref (Pointer(S)); { Thread safe }
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Pointer(S):=SNew;
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end;
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end;
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Function Copy (Const S : WideString; Index,Size : Longint) : WideString;
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var
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ResultAddress : Pointer;
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begin
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ResultAddress:=Nil;
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dec(index);
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if Index < 0 then
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Index := 0;
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{ Check Size. Accounts for Zero-length S, the double check is needed because
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Size can be maxint and will get <0 when adding index }
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if (Size>Length(S)) or
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(Index+Size>Length(S)) then
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Size:=Length(S)-Index;
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If Size>0 then
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begin
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If Index<0 Then
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Index:=0;
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ResultAddress:=Pointer(NewWideString (Size));
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if ResultAddress<>Nil then
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begin
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Move (Pointer(Pointer(S)+index)^,ResultAddress^,Size*2);
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PWideRec(ResultAddress-WideFirstOff)^.Len:=Size;
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PWord(ResultAddress+Size*2)^:=0;
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end;
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end;
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Pointer(Copy):=ResultAddress;
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end;
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Function Pos (Const Substr : WideString; Const Source : WideString) : Longint;
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var
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substrlen,
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maxi,
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i,j : longint;
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e : boolean;
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{ S : WideString;
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se : Pointer; }
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begin
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i := 0;
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j := 0;
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substrlen:=Length(SubStr);
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maxi:=length(source)-substrlen;
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e:=(substrlen>0);
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while (e) and (i <= maxi) do
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begin
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inc (i);
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{!!!: if Source[i]=SubStr[1] then
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begin
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S:=copy(Source,i,substrlen);
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Se:=pointer(SubStr);
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if WideStr_Compare(se,Pointer(S))=0 then
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begin
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j := i;
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break;
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end;
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end;}
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end;
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pos := j;
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end;
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Procedure Delete (Var S : WideString; Index,Size: Longint);
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Var
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LS : Longint;
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begin
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If Length(S)=0 then
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exit;
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if index<=0 then
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begin
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inc(Size,index-1);
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index:=1;
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end;
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LS:=PWideRec(Pointer(S)-WideFirstOff)^.Len;
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if (Index<=LS) and (Size>0) then
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begin
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UniqueString (S);
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if Size+Index>LS then
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Size:=LS-Index+1;
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if Index+Size<=LS then
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begin
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Dec(Index);
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Move(PByte(Pointer(S))[Index+Size],PByte(Pointer(S))[Index],(LS-Index+1)*2);
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end;
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Setlength(s,LS-Size);
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end;
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end;
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Procedure Insert (Const Source : WideString; Var S : WideString; Index : Longint);
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var
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Temp : WideString;
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LS : Longint;
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begin
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If Length(Source)=0 then
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exit;
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if index <= 0 then
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index := 1;
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Ls:=Length(S);
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if index > LS then
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index := LS+1;
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Dec(Index);
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Pointer(Temp) := NewWideString(Length(Source)+LS);
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SetLength(Temp,Length(Source)+LS);
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If Index>0 then
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move (Pointer(S)^,Pointer(Temp)^,Index*2);
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Move (Pointer(Source)^,PByte(Temp)[Index],Length(Source)*2);
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If (LS-Index)>0 then
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Move(PByte(Pointer(S))[Index],PByte(temp)[Length(Source)+index],(LS-Index)*2);
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S:=Temp;
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end;
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{!!!:Procedure SetString (Var S : WideString; Buf : PWideChar; Len : Longint);
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begin
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SetLength(S,Len);
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Move (Buf[0],S[1],Len*2);
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end;}
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{
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$Log$
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Revision 1.6 2000-11-06 23:17:15 peter
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* removed some warnings
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Revision 1.5 2000/11/06 20:34:24 peter
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* changed ver1_0 defines to temporary defs
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Revision 1.4 2000/10/21 18:20:17 florian
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* a lot of small changes:
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- setlength is internal
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- win32 graph unit extended
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....
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Revision 1.3 2000/08/08 22:12:36 sg
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* Implemented WideString helper functions (but they are not tested yet
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due to the lack of full compiler support for WideString/WideChar!)
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Revision 1.2 2000/07/13 11:33:46 michael
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+ removed logs
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} |