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texutil.pp
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texutil.pp
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unit texutil;
{This unit contains various useful functions for dealing}
{with strings.}
{
GearHead2, a roguelike mecha CRPG
Copyright (C) 2005 Joseph Hewitt
This library is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or (at
your option) any later version.
The full text of the LGPL can be found in license.txt.
This library is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this library; if not, write to the Free Software Foundation,
Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
}
{$LONGSTRINGS ON}
interface
uses STRINGS;
Procedure DeleteWhiteSpace(var S: String);
Procedure DeleteFirstChar(var S: String);
Function ExtractWord(var S: String): String;
Function ExtractValue(var S: String): LongInt;
Function ExtractReal(var S: String): Real;
Function RetrieveAString(const S: String): String;
Function RetrieveBracketString(const S: String): String;
Function RetrieveAPreamble(const S: String ): String;
Function SanitizeFilename( S: String ): String;
Function BStr( N: LongInt ): String;
Function SgnStr( N: Integer ): String;
Function WideStr( N,Width: LongInt ): String;
Function Acronym( phrase: String ): String; {can't const}
Function Acronym( const phrase: String ; NumPlaces: Byte ): String;
Function Concentrate( const S: String ): String;
Function Sgn( N: LongInt ): Integer;
Function PartMatchesCriteria( const Part_In,Desc_In: String ): Boolean;
Function PartAtLeastOneMatch( const Part_In,Desc_In: String ): Boolean;
Function AStringHasBString( const A,B: String ): Boolean;
Function HeadMatchesString( const H,S: String ): Boolean;
Function QuickPCopy( const msg: String ): PChar;
Function IsPunctuation( C: Char ): Boolean;
Procedure ReplacePat( var msg: String; const pat_in,s: String );
Function ReplaceHash( const msg, s: String ): String;
Function StringMatchWeight( Part,Desc: String ): Integer;
Procedure AlterDescriptors( var Original,Change: String );
Procedure AtoAn( var msg: String );
Procedure AddTraits( var Trait_List: String; Traits_To_Add: String );
Function QuoteString( A: String ): String;
Procedure AddToQuoteString( var QList,QToAdd: String );
Function NoQItemsMatch( const QList: String; var QToCheck: String ): Boolean;
implementation
Procedure DeleteWhiteSpace(var S: String);
{Delete any whitespace which is at the beginning of}
{string S. If S is nothing but whitespace, or if it}
{contains nothing, return an empty string.}
{ BUGS - None detected. Test harnessed and everything.}
var
P: Integer;
begin
{ Error check }
if S = '' then Exit;
{Locate the first relevant char.}
P := 1;
while (P < Length(S)) and ((S[P] = ' ') or (S[P] = #9)) do begin
Inc(P);
end;
{Copy the string from the first nonspace to the end.}
if (S[P] = ' ') or (S[P] = #9) then S := ''
else S := Copy(S,P,Length(S));
end;
Procedure DeleteFirstChar(var S: String);
{ Remove the first character from string S. }
begin
{Copy the string from the first nonspace to the end.}
if Length( S ) < 2 then S := ''
else S := Copy(S,2,Length(S));
end;
Function ExtractWord(var S: String): String;
{Extract the next word from string S.}
{Return this substring as the function's result;}
{truncate S so that it is now the remainder of the string.}
{If there is no word to extract, both S and the function}
{result will be set to empty strings.}
{ BUGS - None found.}
var
P: Integer;
it: String;
begin
{To start the process, strip all whitespace from the}
{beginning of the string.}
DeleteWhiteSpace(S);
{Error check- make sure that we have something left to}
{extract! The string could have been nothing but white space.}
if S <> '' then begin
{Determine the position of the next whitespace.}
P := Pos(' ',S);
if P = 0 then P := Pos(#9,S);
{Extract the command.}
if P <> 0 then begin
it := Copy(S,1,P-1);
S := Copy(S,P,Length(S));
end else begin
it := Copy(S,1,Length(S));
S := '';
end;
end else begin
it := '';
end;
ExtractWord := it;
end;
Function ExtractValue(var S: String): LongInt;
{This is similar to the above procedure, but}
{instead of a word it extracts a numeric value.}
{Return 0 if the extraction should fail for any reason.}
var
S2: String;
it,C: LongInt;
begin
S2 := ExtractWord(S);
Val(S2,it,C);
if C <> 0 then it := 0;
ExtractValue := it;
end;
Function ExtractReal(var S: String): Real;
{This is similar to the above procedure, but}
{instead of a word it extracts a numeric value.}
{Return 0 if the extraction should fail for any reason.}
var
S2: String;
it: Real;
C: Byte;
begin
S2 := ExtractWord(S);
Val(S2,it,C);
if C <> 0 then it := 0;
ExtractReal := it;
end;
Function RetrieveAString(const S: String): String;
{Retrieve an Alligator String from S.}
{Alligator Strings are defined as the part of the string}
{that both alligarors want to eat, i.e. between < and >.}
var
A1,A2: Integer;
begin
{Locate the position of the two alligators.}
A1 := Pos('<',S);
A2 := Pos('>',S);
{If the string has not been declared with <, return}
{an empty string.}
if A1 = 0 then Exit('');
{If the string has not been closed with >, return the}
{entire remaining length of the string.}
if A2 = 0 then A2 := Length(S)+1;
RetrieveAString := Copy(S,A1+1,A2-A1-1);
end;
Function RetrieveBracketString(const S: String): String;
{ Like the above, but the string is surrounded by ( and ) . }
var
A1,A2: Integer;
begin
{Locate the position of the two alligators.}
A1 := Pos('(',S);
A2 := Pos(')',S);
{If the string has not been declared with <, return}
{an empty string.}
if A1 = 0 then Exit('');
{If the string has not been closed with >, return the}
{entire remaining length of the string.}
if A2 = 0 then A2 := Length(S)+1;
RetrieveBracketString := Copy(S,A1+1,A2-A1-1);
end;
Function RetrieveAPreamble( const S: String ): String;
{ Usually an alligator string will have some kind of label in }
{ front of it. This function will retrieve the label in its }
{ entirety. }
{ LIMITATION: Doesn't return the character immediately before }
{ the AString, which should be a space. }
var
A1: Integer;
msg: String;
begin
A1 := Pos('<',S);
if A1 <> 0 then begin
msg := Copy(S, 1 , A1-2);
end else begin
msg := '';
end;
RetrieveAPreamble := msg;
end;
Function BStr( N: LongInt ): String;
{ This function functions as the BASIC Str function. }
var
it: String;
begin
Str(N, it);
BStr := it;
end;
Function SgnStr( N: Integer ): String;
{ Convert the string to a number, including either a '+' or '-'. }
var
it: String;
begin
it := BStr( N );
if N>= 0 then it := '+' + it;
SgnStr := it;
end;
Function WideStr( N,Width: LongInt ): String;
{ Pack the string with zeroes until it's the specified width. }
{ This command is being used for my clock. }
var
msg: String;
begin
msg := BStr( Abs( N ) );
while Length( msg ) < Width do msg := '0' + msg;
if N < 0 then msg := '-' + msg;
WideStr := msg;
end;
function IsAlpha( C: Char ): Boolean;
{ Return TRUE if C is a letter, FALSE otherwise. }
begin
if ( UpCase( C ) >= 'A' ) and ( UpCase( C ) <= 'Z' ) then IsAlpha := True
else IsAlpha := False;
end;
Function Acronym( phrase: String ): String; {can't const}
{ Copy all the capital letters from the PHRASE, and construct an acronym. }
var
A: String; { A String. In honor of the C64. }
T: Integer; { A loop counter. In honor of the C64. }
begin
A := '';
for t := 1 to Length( phrase ) do begin
if ( phrase[T] = UpCase( phrase[T] ) ) and IsAlpha( phrase[T] ) then A := A + phrase[T];
end;
Acronym := A;
end;
Function Acronym( const phrase: String ; NumPlaces: Byte ): String;
{ This function works like the above one, but pad out the acronym to }
{ NumPlaces characters. }
var
A: String;
begin
A := Acronym( phrase );
if Length( A ) > NumPlaces then begin
A := Copy( A , 1 , NumPlaces );
end else if Length( A ) < NumPlaces then begin
while Length( A ) < NumPlaces do A := A + ' ';
end;
Acronym := A;
end;
Function Concentrate( const S: String ): String;
{ Remove all white space from this string, leaving nothing }
{ but concentrated alphanumeric goodness. }
var
T: Integer;
CS: String;
begin
CS := '';
for T := 1 to Length( S ) do begin
{ If this character is neither a space nor a tab, }
{ add it to our concentrated string. }
if (S[T] <> ' ') and (S[T] = #9) then CS := CS + S[T];
end;
Concentrate := CS;
end;
Function SanitizeFilename( S: String ): String;
{ Replace all proscribed characters with an underscore. }
const
ProscribedCharacters = ',?"*~#%&{}:<>+|';
var
T: Integer;
begin
for T := 1 to Length( S ) do begin
if Pos( S[T] , ProscribedCharacters ) > 0 then begin
S[T] := '_';
end;
end;
SanitizeFilename := S;
end;
Function Sgn( N: LongInt ): Integer;
{ Return the sign of this number, just like in BASIC. }
begin
if N > 0 then Sgn := 1
else if N < 0 then Sgn := -1
else Sgn := 0;
end;
Function StringMatchWeight( Part,Desc: String ): Integer;
{ Return the match weight of PART to DESC. If the weight is 0, then }
{ PART doesn't match DESC. All important traits listed in DESC must }
{ be found in PART. Optional traits are preceded by a ~; these don't have }
{ to be included in PART but increase the weight if they are. }
{ Negative traits must be preceded by a -; these must _not_ be present }
{ in Part. }
Function ExtractOrClause(var S: String): String;
{Extract the next trait from the or-list.}
var
P: Integer;
it: String;
begin
{Error check- make sure that we have something left to}
{extract! The string could have been nothing but white space.}
if S <> '' then begin
{Determine the position of the next whitespace.}
P := Pos('|',S);
if P = 0 then P := Pos(')',S);
{Extract the command.}
if P <> 0 then begin
it := Copy(S,1,P-1);
S := Copy(S,P+1,Length(S));
end else begin
it := Copy(S,1,Length(S));
S := '';
end;
end else begin
it := '';
end;
ExtractOrClause := it;
end;
var
Trait,T2: String;
it,MatchFound: Boolean;
N: Integer;
begin
Part := UpCase( Part );
Desc := UpCase( Desc );
{ Assume TRUE unless a trait is found that isn't in NDesc. }
it := True;
N := -1;
DeleteWhiteSpace( Desc );
while Desc <> '' do begin
Trait := ExtractWord( Desc );
if Trait <> '' then begin
if Trait[1] = '~' then begin
DeleteFirstChar( Trait );
if Pos( Trait , Part ) > 0 then Inc( N );
end else if Trait[1] = '-' then begin
{ A trait beginning with a "-" must NOT be present. }
DeleteFirstChar( Trait );
if Pos( Trait , Part ) <> 0 then begin
it := False;
end;
end else if Trait[1] = '(' then begin
{ A set of traits surrounded by parenthesis and separated by |s }
{ is an or-list. One of the traits must be present. }
DeleteFirstChar( Trait );
MatChFound := False;
repeat
T2 := ExtractOrClause( Trait );
if Pos( T2 , Part ) <> 0 then MatchFound := True;
until ( Trait = '' ) or MatchFound;
if MatchFound then Inc( N )
else it := False;
end else if UpCase( Trait ) = 'COMMON' then begin
{ A trait marked as COMMON will appear more often, despite number }
{ of matches. Use sparingly. }
N := N + 5;
end else begin
if Pos( Trait , Part ) = 0 then begin
it := False;
end else begin
Inc( N );
end;
end;
end; { if Trait <> '' }
end;
if IT and ( N >= 0 ) then begin
if N < 4 then begin
StringMatchWeight := N + 1;
end else begin
StringMatchWeight := ( N * N div 2 ) - N + 2;
end;
end else begin
StringMatchWeight := 0;
end;
end;
Function PartMatchesCriteria( const Part_In,Desc_In: String ): Boolean;
{ Return TRUE if the provided part description matches the provided }
{ search criteria. Return FALSE otherwise. }
{ A match is had if all the words in DESC are found in PART. }
begin
PartMatchesCriteria := StringMatchWeight( Part_In + ' ONE_MATCH' , Desc_In + ' ONE_MATCH' ) > 0;
end;
Function PartAtLeastOneMatch( const Part_In,Desc_In: String ): Boolean;
{ Return TRUE if the provided part description partially matches the provided }
{ search criteria. Return FALSE otherwise. }
{ A match is had if at least one word in DESC is found in PART. }
var
Trait: String;
Part, Desc: String;
N: Integer;
begin
Part := UpCase( Part_In );
Desc := UpCase( Desc_In );
N := 0;
DeleteWhiteSpace( Desc );
while Desc <> '' do begin
Trait := ExtractWord( Desc );
if Pos( Trait , Part ) <> 0 then Inc( N );
end;
PartAtLeastOneMatch := N > 0;
end;
Function AStringHasBString( const A,B: String ): Boolean;
{ Return TRUE if B is contained in A, FALSE otherwise. }
begin
AStringHasBString := Pos( UpCase( B ) , UpCase( A ) ) > 0;
end;
Function HeadMatchesString( const H,S: String ): Boolean;
{ Return TRUE if the beginning Len(H) characters of S are H. }
var
T : String;
begin
T := Copy( S , 1 , Length( H ) );
HeadMatchesString := UpCase( T ) = UpCase( H );
end;
Function QuickPCopy( const msg: String ): PChar;
{ Life is short. Copy msg to a pchar without giving me any attitude about it. }
{ Remember to deallocate that sucker when you're done playing with it. }
var
pmsg: PChar;
begin
pmsg := StrAlloc( length(msg ) + 1 );
StrPCopy( pmsg , msg );
QuickPCopy := pmsg;
end;
Function IsPunctuation( C: Char ): Boolean;
{ Return TRUE if C is some kind of punctuation, or FALSE otherwise. }
{ This is used for the message scripting commands so please }
{ forgive me if my definition of punctuation in this function }
{ is not the same as my own. }
begin
case C of
'.',',',':',';','@','!','/','?','''': IsPunctuation := True;
else IsPunctuation := False;
end;
end;
Procedure ReplacePat( var msg: String; const pat_in,s: String );
{ Replace all instances of PAT in MSG with S. }
var
N: Integer;
pat: String;
begin
pat := UpCase( pat_in);
{ Error check- if S contains the pattern there could be an infinite loop. }
if AStringHasBString( S , pat ) then Exit;
repeat
N := Pos( pat , UpCase( msg ) );
if N <> 0 then begin
msg := Copy( msg , 1 , N - 1 ) + S + Copy( msg , N + Length( pat ) , Length( msg ) );
end;
until N = 0;
end;
Function ReplaceHash( const msg,s: String ): String;
{ Look for a hash sign in MSG. Replace it with S. }
var
N: Integer;
msg_out: String;
begin
N := Pos( '#' , msg );
if N <> 0 then begin
msg_out := Copy( msg , 1 , N - 1 ) + S + Copy( msg , N + 1 , Length( msg ) );
end else begin
msg_out := msg;
end;
ReplaceHash := msg_out;
end;
Procedure AlterDescriptors( var Original,Change: String );
{ Alter the XRan descriptors held in ORIGINAL, based on the changes }
{ requested by CHANGE. Note that the contents of CHANGE will be utterly destrouyed }
{ by this process. }
var
cmd: String;
N: Integer;
begin
while change <> '' do begin
cmd := extractword( Change );
if cmd <> '' then begin
N := Pos( Copy( cmd , 1 , 2 ) , Original );
if N > 0 then begin
Original := Copy( Original , 1 , N - 1 ) + cmd + Copy( Original , N + Length( cmd ) , Length( Original ) );
end else begin
Original := Original + ' ' + cmd;
end;
end;
end;
end;
Procedure AtoAn( var msg: String );
{ Go through the message, replacing "A" with "An" where appropriate. }
const
vowels = 'aeiouAEIOU';
var
w,msg_out: String;
begin
msg_out := '';
while msg <> '' do begin
w := ExtractWord( msg );
DeleteWhiteSpace( msg );
if UpCase( w ) = 'A' then begin
if Pos( msg[1] , vowels ) <> 0 then w := w + 'n';
end;
msg_out := msg_out + ' ' + w;
end;
msg := msg_out;
end;
Procedure AddTraits( var Trait_List: String; Traits_To_Add: String );
{ TRAIT_LIST is a list of traits, such as that which may occur in a TYPE string. }
{ Add the traits in TRAITS_TO_ADD to the list, but don't add any that already }
{ occur in the list. }
var
T: String;
begin
while Traits_To_Add <> '' do begin
T := ExtractWord( Traits_To_Add );
if ( T <> '' ) and not AStringHasBString( Trait_List , T ) then Trait_List := Trait_List + ' ' + T;
end;
end;
Function QuoteString( A: String ): String;
{ Replace all spaces with quotes, so any single word from A can be }
{ searched for like "this". }
var
B,W: String;
begin
B := '"';
while A <> '' do begin
W := ExtractWord( A );
if W <> '' then B := B + W + '"';
end;
QuoteString := B;
end;
Procedure AddToQuoteString( var QList,QToAdd: String );
{ Add some traits to a quote string. Make sure that everything is separated by quotes. }
var
A: String;
begin
while QToAdd <> '' do begin
A := ExtractWord( QToAdd );
if A <> '' then begin
if QList = '' then QList := '"';
QList := QList + A + '"';
end;
end;
end;
Function NoQItemsMatch( const QList: String; var QToCheck: String ): Boolean;
{ Check to make sure that none of the words in QToCheck are present in QList. }
{ This procedure will completely destroy QToCheck, by the way. }
var
AllOK: Boolean;
A: String;
begin
{ Assume TRUE unless a match is found. }
AllOK := True;
while ( QToCheck <> '' ) and AllOK do begin
A := ExtractWord( QToCheck );
if ( A <> '' ) and AStringHasBString( QList , '"' + A + '"' ) then AllOK := False;
end;
NoQItemsMatch := AllOK;
end;
end.