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(*
* The contents of this file are subject to the Mozilla Public License
* Version 1.1 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
* License for the specific language governing rights and limitations
* under the License.
*
* The Initial Developer of this code is John Hansen.
* Portions created by John Hansen are Copyright (C) 2009 John Hansen.
* All Rights Reserved.
*
*)
unit ParamUtils;
interface
uses
Classes;
function ParamSwitch(S: String; bIgnoreCase : Boolean = true; const cmdLine : string = ''): Boolean;
function ParamValue(S: String; bIgnoreCase : Boolean = true; const cmdLine : string = ''): String;
function ParamIntValue(S: String; def : Integer = -1; bIgnoreCase : Boolean = true; const cmdLine : string = ''): Integer;
function JCHParamStr(Index: Integer; const cmdLine : string = ''): string;
function JCHParamCount(const cmdLine : string = ''): Integer;
function getFilenameParam(const cmdLine : string = '') : string;
procedure LoadParamDefinitions(aStrings : TStrings; const cmdLine : string = '');
implementation
uses
SysUtils;
function CharNext(P : PChar) : PChar;
begin
Result := P;
Inc(Result);
end;
function GetParamStr(P: PChar; var Param: string): PChar;
var
i, Len: Integer;
Start, S, Q: PChar;
begin
while True do
begin
while (P[0] <> #0) and (P[0] <= ' ') do
P := CharNext(P);
if (P[0] = '"') and (P[1] = '"') then Inc(P, 2) else Break;
end;
Len := 0;
Start := P;
while P[0] > ' ' do
begin
if P[0] = '"' then
begin
P := CharNext(P);
while (P[0] <> #0) and (P[0] <> '"') do
begin
Q := CharNext(P);
Inc(Len, Q - P);
P := Q;
end;
if P[0] <> #0 then
P := CharNext(P);
end
else
begin
Q := CharNext(P);
Inc(Len, Q - P);
P := Q;
end;
end;
SetLength(Param, Len);
P := Start;
S := Pointer(Param);
i := 0;
while P[0] > ' ' do
begin
if P[0] = '"' then
begin
P := CharNext(P);
while (P[0] <> #0) and (P[0] <> '"') do
begin
Q := CharNext(P);
while P < Q do
begin
S[i] := P^;
Inc(P);
Inc(i);
end;
end;
if P[0] <> #0 then P := CharNext(P);
end
else
begin
Q := CharNext(P);
while P < Q do
begin
S[i] := P^;
Inc(P);
Inc(i);
end;
end;
end;
Result := P;
end;
function JCHParamStr(Index: Integer; const cmdLine : string): string;
var
P: PChar;
begin
Result := '';
if (Index = 0) or (cmdLine = '') then
Result := ParamStr(Index)
else
begin
P := PChar(cmdLine);
while True do
begin
P := GetParamStr(P, Result);
if (Index = 0) or (Result = '') then Break;
Dec(Index);
end;
end;
end;
function JCHParamCount(const cmdLine : string): Integer;
var
P: PChar;
S: string;
begin
Result := 0;
S := '';
if cmdLine = '' then
Result := ParamCount
else
begin
P := GetParamStr(PChar(cmdLine), S);
while True do
begin
P := GetParamStr(P, S);
if S = '' then Break;
Inc(Result);
end;
end;
end;
function ParamSwitch(S: String; bIgnoreCase : Boolean; const cmdLine : string): Boolean;
var
I: Integer;
P: String;
begin
Result := False ;
if bIgnoreCase then S := UpperCase(S);
for I := 0 to JCHParamCount(cmdLine) do begin
P := JCHParamStr(I, cmdLine);
if bIgnoreCase then P := UpperCase(P);
if (P=S) or (Pos(S+'=',P)=1) then begin
Result := True ;
Break;
end;
end;
end;
function ParamValue(S: String; bIgnoreCase : Boolean; const cmdLine : string): String;
var
I : Integer;
P, val: String;
begin
Result := '' ;
if bIgnoreCase then S := UpperCase(S);
for I := 0 to JCHParamCount(cmdLine) do begin
val := JCHParamStr(I, cmdLine);
if bIgnoreCase then
P := UpperCase(val)
else
P := val;
if (Pos(S+'=',P)<>0) then begin
Result := Copy(val,Length(S)+2,MaxInt);
Break;
end;
end;
end;
function ParamIntValue(S: String; def : integer; bIgnoreCase : Boolean; const cmdLine : string): Integer;
begin
Result := StrToIntDef(ParamValue(S, bIgnoreCase, cmdLine), def);
end;
function getFilenameParam(const cmdLine : string) : string;
var
i : Integer;
tmp : string;
begin
Result := '';
for i := 1 to JCHParamCount(cmdLine) do
begin
tmp := JCHParamStr(i, cmdLine);
if Pos('-', tmp) = 1 then Continue; // a switch
// the first parameter that is not a switch is the filename
Result := tmp;
Break;
end;
end;
procedure LoadParamDefinitions(aStrings : TStrings; const cmdLine : string);
var
I : Integer;
P: String;
begin
for I := 0 to JCHParamCount(cmdLine) do begin
P := JCHParamStr(I, cmdLine);
if Pos('-D=', P) = 1 then begin
// this is a #define
System.Delete(P, 1, 3);
if Pos('=', P) = 0 then
P := P + '=1';
aStrings.Add(P);
end;
end;
end;
end.
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