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{ ******************************************************************
Pascal string routines
****************************************************************** }
unit ustrings;
interface
uses
utypes;
function LTrim(S : String) : String;
{ ------------------------------------------------------------------
Removes leading blanks
------------------------------------------------------------------ }
function RTrim(S : String) : String;
{ ------------------------------------------------------------------
Removes trailing blanks
------------------------------------------------------------------ }
function Trim(S : String) : String;
{ ------------------------------------------------------------------
Removes leading and trailing blanks
------------------------------------------------------------------ }
function StrChar(N : Byte; C : Char) : String;
{ ------------------------------------------------------------------
Returns a string made of character C repeated N times
------------------------------------------------------------------ }
function RFill(S : String; L : Byte) : String;
{ ------------------------------------------------------------------
Completes string S with trailing blanks for a total length L
------------------------------------------------------------------ }
function LFill(S : String; L : Byte) : String;
{ ------------------------------------------------------------------
Completes string S with leading blanks for a total length L
------------------------------------------------------------------ }
function CFill(S : String; L : Byte) : String;
{ ------------------------------------------------------------------
Completes string S with leading blanks
to center the string on a total length L
------------------------------------------------------------------ }
function Replace(S : String; C1, C2 : Char) : String;
{ ------------------------------------------------------------------
Replaces in string S all the occurences
of character C1 by character C2
------------------------------------------------------------------ }
function Extract(S : String; var Index : Byte; Delim : Char) : String;
{ ------------------------------------------------------------------
Extracts a field from a string. Index is the position of the first
character of the field. Delim is the character used to separate
fields (e.g. blank, comma or tabulation). Blanks immediately
following Delim are ignored. Index is updated to the position of
the next field.
------------------------------------------------------------------ }
procedure Parse(S : String; Delim : Char; Field : PStrVector; var N : Byte);
{ ------------------------------------------------------------------
Parses a string into its constitutive fields. Delim is the field
separator. The number of fields is returned in N. The fields are
returned in Field^[0]..Field^[N - 1]. Field must be dimensioned in
the calling program.
------------------------------------------------------------------ }
procedure SetFormat(NumLength, MaxDec : Integer;
FloatPoint, NSZero : Boolean);
{ ------------------------------------------------------------------
Sets the numeric format
NumLength = Length of numeric field
MaxDec = Max. number of decimal places
FloatPoint = True for floating point notation
NSZero = True to write non significant zero's
------------------------------------------------------------------ }
function FloatStr(X : Float) : String;
{ ------------------------------------------------------------------
Converts a real to a string according to the numeric format
------------------------------------------------------------------ }
function IntStr(N : LongInt) : String;
{ ------------------------------------------------------------------
Converts an integer to a string
------------------------------------------------------------------ }
function CompStr(Z : Complex) : String;
{ ------------------------------------------------------------------
Converts a complex number to a string
------------------------------------------------------------------ }
implementation
const
gNumLength : Integer = 10;
gMaxDec : Integer = 4;
gFloatPoint : Boolean = False;
gNSZero : Boolean = False;
function LTrim(S : String) : String;
begin
if S <> '' then
repeat
if S[1] = ' ' then Delete(S, 1, 1);
until S[1] <> ' ';
LTrim := S;
end;
function RTrim(S : String) : String;
var
L1 : Byte;
begin
if S <> '' then
repeat
L1 := Length(S);
if S[L1] = ' ' then Delete(S, L1, 1);
until S[L1] <> ' ';
RTrim := S;
end;
function Trim(S : String) : String;
begin
Trim := LTrim(RTrim(S));
end;
function StrChar(N : Byte; C : Char) : String;
var
I : Byte;
S : String;
begin
S := '';
for I := 1 to N do
S := S + C;
StrChar := S;
end;
function RFill(S : String; L : Byte) : String;
var
L1 : Byte;
begin
L1 := Length(S);
if L1 >= L then
RFill := S
else
RFill := S + StrChar(L - L1, ' ');
end;
function LFill(S : String; L : Byte) : String;
var
L1 : Byte;
begin
L1 := Length(S);
if L1 >= L then
LFill := S
else
LFill := StrChar(L - L1, ' ') + S;
end;
function CFill(S : String; L : Byte) : String;
var
L1 : Byte;
begin
L1 := Length(S);
if L1 >= L then
CFill := S
else
CFill := StrChar((L - L1) div 2, ' ') + S;
end;
function Replace(S : String; C1, C2 : Char) : String;
var
S1 : String;
K : Byte;
begin
S1 := S;
K := Pos(C1, S1);
while K > 0 do
begin
S1[K] := C2;
K := Pos(C1, S1);
end;
Replace := S1;
end;
function Extract(S : String; var Index : Byte; Delim : Char) : String;
var
I, L : Byte;
begin
I := Index;
L := Length(S);
{ Search for Delim }
while (I <= L) and (S[I] <> Delim) do
Inc(I);
{ Extract field }
if I = Index then
Extract := ''
else
Extract := Copy(S, Index, I - Index);
{ Skip blanks after Delim }
repeat
Inc(I);
until (I > L) or (S[I] <> ' ');
{ Update Index }
Index := I;
end;
procedure Parse(S : String; Delim : Char; Field : PStrVector; var N : Byte);
var
I, Index, L : Byte;
begin
I := 0;
Index := 1;
L := Length(S);
repeat
Field^[I] := Extract(S, Index, Delim);
Inc(I);
until Index > L;
N := I;
end;
procedure SetFormat(NumLength, MaxDec : Integer;
FloatPoint, NSZero : Boolean);
begin
if (NumLength >= 1) and (NumLength <= 80) then gNumLength := NumLength;
if (MaxDec >= 0) and (MaxDec <= 20) then gMaxDec := MaxDec;
gFloatPoint := FloatPoint;
gNSZero := NSZero;
end;
function RemZero(S : String) : String;
var
I : Integer;
S1, S2 : String;
C : Char;
begin
I := Pos('.', S);
if I = 0 then
begin
RemZero := S;
Exit
end;
I := Pos('E', S);
if I = 0 then I := Pos('e', S);
if I > 0 then
begin
S1 := Copy(S, 1, I - 1);
S2 := Copy(S, I, Length(S) - I + 1)
end
else
begin
S1 := S;
S2 := ''
end;
repeat
I := Length(S1);
C := S1[I];
if (C = '0') or (C = '.') then S1 := Copy(S1, 1, I - 1)
until C <> '0';
RemZero := S1 + S2
end;
function FloatStr(X : Float) : String;
var
S : String;
begin
if gFloatPoint then
begin
Str(X:Pred(gNumLength), S);
S := ' ' + S;
end
else
Str(X:gNumLength:gMaxDec, S);
if not gNSZero then
S := RemZero(S);
FloatStr := S;
end;
function IntStr(N : LongInt) : String;
var
S : String;
begin
Str(N:(gNumLength - gMaxDec - 1), S);
IntStr := S;
end;
function CompStr(Z : Complex) : String;
var
S : String;
begin
if Z.Y >= 0.0 then S := ' + ' else S := ' - ';
CompStr := FloatStr(Z.X) + S + FloatStr(Abs(Z.Y)) + ' * i';
end;
end.
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