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type
TEqualFunction = function (const a,b : char) : boolean;
function EqualWithCase (const a,b : char) : boolean;
begin
result := (a = b);
end;
function EqualWithoutCase (const a,b : char) : boolean;
begin
result := (lowerCase(a) = lowerCase(b));
end;
function IsWholeWord (bufstart, bufend, wordstart, wordend : pchar) : boolean;
begin
// Check start
result := ((wordstart = bufstart) or ((wordstart-1)^ in worddelimiters)) and
// Check end
((wordend = bufend) or ((wordend+1)^ in worddelimiters));
end;
function SearchDown(buf,aStart,endchar:pchar; SearchString:string;
Equals : TEqualFunction; WholeWords:boolean) : pchar;
var Found : boolean;
s, c : pchar;
begin
result := aStart;
Found := false;
while not Found and (result <= endchar) do
begin
// Search first letter
while (result <= endchar) and not Equals(result^,SearchString[1]) do
inc (result);
// Check if following is searchstring
c := result;
s := @(Searchstring[1]);
Found := true;
while (c <= endchar) and (s^ <> #0) and Found do
begin
Found := Equals(c^, s^);
inc (c);
inc (s);
end;
if s^ <> #0 then
Found := false;
// Check if it is a word
if Found and WholeWords then
Found := IsWholeWord(buf,endchar,result,c-1);
if not found then
inc (result);
end;
if not Found then
result := nil;
end;
function SearchUp(buf,aStart,endchar:pchar; SearchString:string;
equals : TEqualFunction; WholeWords:boolean) : pchar;
var Found : boolean;
s, c, l : pchar;
begin
result := aStart;
Found := false;
l := @(SearchString[length(SearchString)]);
while not Found and (result >= buf) do
begin
// Search last letter
while (result >= buf) and not Equals(result^,l^) do
dec (result);
// Check if before is searchstring
c := result;
s := l;
Found := true;
while (c >= buf) and (s >= @SearchString[1]) and Found do
begin
Found := Equals(c^, s^);
dec (c);
dec (s);
end;
if (s >= @(SearchString[1])) then
Found := false;
// Check if it is a word
if Found and WholeWords then
Found := IsWholeWord(buf,endchar,c+1,result);
if found then
result := c+1
else
dec (result);
end;
if not Found then
result := nil;
end;
//function SearchDown(buf,aStart,endchar:pchar; SearchString:string; equal : TEqualFunction; WholeWords:boolean) : pchar;
function SearchBuf(Buf: PChar;BufLen: Integer;SelStart: Integer;SelLength: Integer;
SearchString: String;Options: TStringSearchOptions):PChar;
var
equal : TEqualFunction;
begin
SelStart := SelStart + SelLength;
if (SearchString = '') or (SelStart > BufLen) or (SelStart < 0) then
result := nil
else
begin
if soMatchCase in Options then
Equal := @EqualWithCase
else
Equal := @EqualWithoutCase;
if soDown in Options then
result := SearchDown(buf,buf+SelStart,Buf+(BufLen-1), SearchString, Equal, (soWholeWord in Options))
else
result := SearchUp(buf,buf+SelStart,Buf+(Buflen-1), SearchString, Equal, (soWholeWord in Options));
end;
end;
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