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2892:string manipulation routines

KEYWORDS: string manipulation routines AREA: Object Pascal

Here are some standard string manipulation functions:

{To determine if the character is a digit.}
function IsDigit(ch: char): boolean;
begin
  Result := ch in ['0'..'9'];
end;

{To determine if the character is an uppercase letter.}
function IsUpper(ch: char): boolean;
begin
  Result := ch in ['A'..'Z'];
end;

{To determine if the character is an lowercase letter.}
function IsLower(ch: char): boolean;
begin
  Result := ch in ['a'..'z'];
end;

{Changes a character to an uppercase letter.}
function ToUpper(ch: char): char;
begin
  Result := chr(ord(ch) and $DF);
end;

{Changes a character to a lowercase letter.}
function ToLower(ch: char): char;
begin
  Result := chr(ord(ch) or $20);
end;

{ Capitalizes first letter of every word in s }
function Proper(const s: string): string;
var
  i: Integer;
  CapitalizeNextLetter: Boolean;
begin
  Result := LowerCase(s);
  CapitalizeNextLetter := True;
  for i := 1 to Length(Result) do
  begin
    if CapitalizeNextLetter and IsLower(Result[i]) then
      Result[i] := ToUpper(Result[i]);
    CapitalizeNextLetter := Result[i] = ' ';
  end;
end;

{ NOTE: The following functions are available in Delphi 2.0,
  but not in Delphi 1.0. }

{Supresses trailing blanks in a string.}
function TrimRight(const s: string): string;
var
  i: integer;
begin
  i := Length(s);
  while (I > 0) and (s[i] <= ' ') do Dec(i);
  Result := Copy(s, 1, i);
end;

{Removes the leading spaces from a string.}
function TrimLeft(const S: string): string;
var
  I, L: Integer;
begin
  L := Length(S);
  I := 1;
  while (I <= L) and (S[I] <= ' ') do Inc(I);
  Result := Copy(S, I, Maxint);
end;

{ Removes leading and trailing whitespace from s);
function Trim(const S: string): string;
var
  I, L: Integer;
begin
  L := Length(S);
  I := 1;
  while (I <= L) and (S[I] <= ' ') do Inc(I);
  if I > L then Result := '' else
  begin
    while S[L] <= ' ' do Dec(L);
    Result := Copy(S, I, L - I + 1);
  end;
end;

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