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Unit CompareWordUnit;
{$mode objfpc}{$H+}
// NewView - a new OS/2 Help Viewer
// Copyright 2001 Aaron Lawrence (aaronl at consultant dot com)
// This software is released under the Gnu Public License - see readme.txt
Interface
// Compares words and produces a match level (relevance) based
// on the relative sizes etc. Used in searching help files
// to sort by relevance.
const
// word weightings
mwExactWord = 20;
mwWordStart = 10;
mwWordWithin = 5;
// Compares the given search word against the given
// reference word. Returns a value indicating how well the
// search word matches, 0 = not at all.
function CompareWord( const SearchWord: string;
const ReferenceWord: string ): longint;
Implementation
uses
SysUtils;
// LOoks for string a within string b, case insensitively
function CaseInsensitivePos( const a, b: string ): longint;
begin
// Budget implementation to begin with.
Result := Pos( UpperCase( a ), UpperCase( b ) );
end;
function CompareWord( const SearchWord: string;
const ReferenceWord: string ): longint;
var
OccurrencePos: longint;
begin
Result := 0;
// First up, if the word we're searching for is longer than
// this word, then it can't match at all.
if Length( SearchWord ) > Length( ReferenceWord ) then
exit;
OccurrencePos := CaseInsensitivePos( SearchWord, ReferenceWord );
if OccurrencePos = 0 then
// no match.
exit;
if Length( SearchWord ) = Length( ReferenceWord ) then
begin
// exact word match (except case)
Result := mwExactWord;
exit;
end;
// partial word match
if OccurrencePos = 1 then
begin
// word starts with searchword
Result := mwWordStart
* Length( SearchWord )
div Length( ReferenceWord );
if Result = 0 then
Result := 1;
exit;
end;
// Matched searchword somewhere within word
Result := mwWordWithin
* Length( SearchWord )
div Length( ReferenceWord );
if Result = 0 then
Result := 1;
end;
{// Note: searchstring must be uppercase,
function IsMatching( const SearchString: string;
const SearchType: TSearchType;
const Item: string ): boolean;
var
temp: string;
begin
case SearchType of
stStarts:
Result:= StrStarts( SearchString, Item );
stContains:
begin
temp:= UpperCase( Item );
Result:= Pos( SearchString, temp ) <> 0;
end;
stMatches:
Result:= CompareText( SearchString,
Item )= 0;
end;
end;
}
Initialization
End.
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