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{
FPCResLipo - Free Pascal External Resource Thinner
Part of the Free Pascal distribution
Copyright (C) 2008 by Giulio Bernardi
Handles the parsing of parameters
See the file COPYING, included in this distribution,
for details about the copyright.
This program 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.
}
unit paramparser;
{$MODE OBJFPC} {$H+}
interface
uses
Classes, SysUtils, externaltypes;
type
EParametersException = class(Exception);
EOutputFileAlreadySetException = class(EParametersException);
EUnknownParameterException = class(EParametersException);
EArgumentMissingException = class(EParametersException);
EUnknownEndianessException = class(EParametersException);
type
{ TParameters }
TParameters = class
private
fHelp : boolean;
fVersion : boolean;
fVerbose : boolean;
fInputFiles : TStringList;
fOutputFile : string;
fEndianess : byte;
procedure ParseOutputFile(aList : TStringList; var index : integer; const parname : string);
procedure ParseEndianess(aList : TStringList; var index : integer; const parname : string);
function DoOptionalArgument(aList : TStringList; const i : integer) : string;
function DoMandatoryArgument(aList : TStringList; const i : integer) : string;
function IsParameter(const s : string) : boolean;
function ParamsToStrList : TStringList;
protected
public
constructor Create;
destructor Destroy; override;
procedure Parse;
property Help : boolean read fHelp;
property Version : boolean read fVersion;
property Verbose : boolean read fVerbose;
property InputFiles : TStringList read fInputFiles;
property OutputFile : string read fOutputFile write fOutputFile;
property Endianess : byte read fEndianess write fEndianess;
end;
implementation
uses
msghandler;
{ TParameters }
procedure TParameters.ParseOutputFile(aList: TStringList; var index: integer;
const parname : string);
begin
if fOutputFile<>'' then
raise EOutputFileAlreadySetException.Create('');
inc(index);
fOutputFile:=DoMandatoryArgument(aList,index);
if fOutputFile='' then
raise EArgumentMissingException.Create(parname);
end;
procedure TParameters.ParseEndianess(aList: TStringList; var index: integer;
const parname: string);
var tmp : string;
begin
inc(index);
tmp:=LowerCase(DoMandatoryArgument(aList,index));
if tmp='' then
raise EArgumentMissingException.Create(parname);
if tmp='big' then fEndianess:=EXT_ENDIAN_BIG
else if tmp='little' then fEndianess:=EXT_ENDIAN_LITTLE
else raise EUnknownEndianessException.Create(tmp);
end;
function TParameters.DoOptionalArgument(aList: TStringList; const i: integer
): string;
begin
Result:='';
if aList.Count>i then
begin
if not IsParameter(aList[i]) then
Result:=aList[i];
end;
end;
function TParameters.DoMandatoryArgument(aList: TStringList; const i: integer
): string;
begin
Result:='';
if aList.count>i then
Result:=aList[i];
end;
function TParameters.IsParameter(const s: string): boolean;
begin
Result:=false;
if length(s)<=1 then exit;
if copy(s,1,1)='-' then Result:=true;
end;
function TParameters.ParamsToStrList: TStringList;
var i : integer;
begin
Result:=TStringList.Create;
try
for i:=1 to ParamCount do
Result.Add(ParamStr(i));
except
Result.Free;
raise;
end;
end;
procedure TParameters.Parse;
var fList : TStringList;
tmp : string;
i : integer;
begin
fList:=ParamsToStrList;
try
i:=0;
while i<fList.Count do
begin
tmp:=fList[i];
Messages.DoVerbose(Format('parsing parameter ''%s''',[tmp]));
if IsParameter(tmp) then
begin
if ((tmp='--help') or (tmp='-h') or (tmp='-?')) then
fHelp:=true
else if ((tmp='--version') or (tmp='-V')) then
fVersion:=true
else if ((tmp='--verbose') or (tmp='-v')) then
fVerbose:=true
else if ((tmp='-o') or (tmp='--output')) then
ParseOutputFile(fList,i,tmp)
else if ((tmp='-e') or (tmp='--endian')) then
ParseEndianess(fList,i,tmp)
else
raise EUnknownParameterException.Create(tmp);
end
else
fInputFiles.Add(tmp); //assume it is an input file
inc(i);
end;
finally
fList.Free;
end;
end;
constructor TParameters.Create;
begin
fHelp:=false;
fVersion:=false;
fVerbose:=false;
fInputFiles:=TStringList.Create;
fOutputFile:='';
fEndianess:=EXT_ENDIAN_BIG;
end;
destructor TParameters.Destroy;
begin
fInputFiles.Free;
end;
end.
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