unit idemacros;

{$mode objfpc}{$H+}

interface

uses
  Classes
  ,SysUtils
  ,fpg_base
  ,fpg_main
  ;

type
  TIDEMacro = class(TObject)
  public
    Name: string;
    Value: string;
    Description: string;
    constructor Create(AName, AValue, ADescription: TfpgString);
  end;


  TIDEMacroList = class(TObject)
  private
    FItems: TList;
    function    GetItems(AIndex: integer): TIDEMacro;
    procedure   SetItems(AIndex: integer; const AValue: TIDEMacro);
    procedure   AddDefaults;
    procedure   LoadSavedValues;
  public
    constructor Create;
    destructor  Destroy; override;
    function    Count: integer;
    function    FindByName(const MacroName: TfpgString): TIDEMacro;
    function    StrHasMacros(const s: TfpgString): boolean;
    function    ExpandMacro(const s: TfpgString): TfpgString;
    procedure   Add(NewMacro: TIDEMacro);
    procedure   Clear;
    procedure   Delete(AIndex: integer);
    procedure   SetValue(const MacroName, NewValue: TfpgString);
    procedure   ResetToDefaults;
    property    Items[AIndex: integer]: TIDEMacro read GetItems write SetItems; default;
  end;


// lazy-man singleton of IDE Macros
function GMacroList: TIDEMacroList;


implementation

uses
  ideconst
  ,fpg_iniutils;

var
  uIDEMacroList: TIDEMacroList;


function GMacroList: TIDEMacroList;
begin
  if not Assigned(uIDEMacroList) then
    uIDEMacroList := TIDEMacroList.Create;
  Result := uIDEMacroList;
end;


{ TIDEMacro }

constructor TIDEMacro.Create(AName, AValue, ADescription: TfpgString);
begin
  Name := AName;
  Value := AValue;
  Description := ADescription;
end;


{ TIDEMacroList }

function TIDEMacroList.GetItems(AIndex: integer): TIDEMacro;
begin
  Result := TIDEMacro(FItems[AIndex]);
end;

procedure TIDEMacroList.SetItems(AIndex: integer; const AValue: TIDEMacro);
begin
  FItems[AIndex] := AValue;
end;

procedure TIDEMacroList.AddDefaults;
var
  o: TIDEMacro;
begin
  o := TIDEMacro.Create(cMacro_FPCSrcDir, '', 'FPC source directory');
  Add(o);
  o := TIDEMacro.Create(cMacro_FPGuiDir, '', 'fpGUI root directory');
  Add(o);
  o := TIDEMacro.Create(cMacro_FPGuiLibDir, cMacro_FPGuiDir+'lib/'+cMacro_Target+'/', 'fpGUI compiled library directory');
  Add(o);
  o := TIDEMacro.Create(cMacro_SyntaxDefDir, cMacro_FPGuiDir+'examples/apps/fpgide/syntaxdefs/', 'Editor syntax highlighter definitions');
  Add(o);
  o := TIDEMacro.Create(cMacro_TemplateDir, cMacro_FPGuiDir+'examples/apps/fpgide/templates/', 'Project template directory');
  Add(o);
  o := TIDEMacro.Create(cMacro_Compiler, '', 'FPC Compiler to use');
  Add(o);
  o := TIDEMacro.Create(cMacro_Debugger, 'gdb', 'Location of GDB debugger');
  Add(o);
  o := TIDEMacro.Create(cMacro_ExeExt, {$IFDEF MSWINDOWS} '.exe' {$ENDIF} {$IFDEF UNIX} '' {$ENDIF}, 'Default executable extension');
  Add(o);
  o := TIDEMacro.Create(cMacro_Target, CPUTarget+'-'+OSTarget, 'Default target');
  Add(o);
end;

procedure TIDEMacroList.LoadSavedValues;
var
  s: TfpgString;
begin
  // we don't unnecessarily override the defaults setup in AddDefaults()
  SetValue(cMacro_FPCSrcDir, gINI.ReadString(cEnvironment, 'FPCSrcDir', ''));
  SetValue(cMacro_FPGuiDir, gINI.ReadString(cEnvironment, 'FPGuiDir', ''));
  s := gINI.ReadString(cEnvironment, 'FPGuiLibDir', '');
  if s <> '' then
    SetValue(cMacro_FPGuiLibDir, s);
  s := gINI.ReadString(cEnvironment, 'SyntaxDefDir', '');
  if s <> '' then
    SetValue(cMacro_SyntaxDefDir, s);
  s := gINI.ReadString(cEnvironment, 'TemplateDir', '');
  if s <> '' then
    SetValue(cMacro_TemplateDir, s);
  SetValue(cMacro_Compiler, gINI.ReadString(cEnvironment, 'Compiler', ''));
  s := gINI.ReadString(cEnvironment, 'Debugger', '');
  if s <> '' then
    SetValue(cMacro_Debugger, s);
  s := gINI.ReadString(cEnvironment, 'ExeExt', '');
  if s <> '' then
    SetValue(cMacro_ExeExt, s);
  s := gINI.ReadString(cEnvironment, 'Target', '');
  if s <> '' then
    SetValue(cMacro_Target, s);
end;

constructor TIDEMacroList.Create;
begin
  inherited Create;
  FItems := TList.Create;
  AddDefaults;
  LoadSavedValues;
end;

destructor TIDEMacroList.Destroy;
begin
  Clear;
  FItems.Free;
  inherited Destroy;
end;

function TIDEMacroList.Count: integer;
begin
  Result := FItems.Count;
end;

function TIDEMacroList.FindByName(const MacroName: TfpgString): TIDEMacro;
var
  l: Integer;
  r: Integer;
  m: Integer;
  cmp: Integer;
begin
  l := 0;
  r := FItems.Count-1;
  m := 0;
  while l <= r do
  begin
    m := (l+r) shr 1;
    Result := Items[m];
    cmp := AnsiCompareText(MacroName,Result.Name);
    if cmp < 0 then
      r := m-1
    else if cmp > 0 then
      l := m+1
    else
      exit;
  end;
  Result := nil;
end;

function TIDEMacroList.StrHasMacros(const s: TfpgString): boolean;
// search for ${
var
  p: Integer;
  Len: Integer;
begin
  Result := false;
  p := 1;
  Len := length(s);
  while (p < Len) do
  begin
    if s[p] = '$' then
    begin
      inc(p);
      if (p<Len) and (s[p]<>'$') then
      begin
        // skip macro function name
        while (p<Len) and (s[p]<>'{') do inc(p);
        if (p<Len) then
        begin
          Result:=true;
          exit;
        end;
      end
      else
      begin
        // $$ is not a macro
        inc(p);
      end;
    end else
      inc(p);
  end;
end;

function TIDEMacroList.ExpandMacro(const s: TfpgString): TfpgString;
var
  sub: TfpgString;
  pstart: integer;
  pend: integer;
  len: integer;
  m: TIDEMacro;
  r: TfpgString;
begin
  r := s;
  pstart := Pos('${', r);
  while (pstart > 0) do
  begin
    len := Length(r);
    pend := pstart + 2;
    while pend < len do
    begin
      if r[pend] = '}' then
        break
      else
        inc(pend);
    end;
    sub := Copy(r, pstart, (pend-pstart)+1);
    m := FindByName(sub);
    if not Assigned(m) then
      raise Exception.CreateFmt('The macro <%s> is not defined.', [sub]);
    r := StringReplace(r, sub, m.Value, [rfReplaceAll, rfIgnoreCase]);
    pstart := Pos('${', r);
  end;
  Result := r;
end;

procedure TIDEMacroList.Add(NewMacro: TIDEMacro);
var
  l: Integer;
  r: Integer;
  m: Integer;
  cmp: Integer;
begin
  l := 0;
  r := FItems.Count-1;
  m := 0;
  while l <= r do
  begin
    m := (l+r) shr 1;
    cmp := AnsiCompareText(NewMacro.Name, Items[m].Name);
    if cmp < 0 then
      r := m-1
    else if cmp > 0 then
      l := m + 1
    else
      break;
  end;
  if (m < FItems.Count) and (AnsiCompareText(NewMacro.Name, Items[m].Name) > 0) then
    inc(m);
  FItems.Insert(m, NewMacro);
end;

procedure TIDEMacroList.Clear;
var
  i: integer;
begin
  for i := 0 to FItems.Count-1 do Items[i].Free;
  FItems.Clear;
end;

procedure TIDEMacroList.Delete(AIndex: integer);
begin
  Items[AIndex].Free;
  FItems.Delete(AIndex);
end;

procedure TIDEMacroList.SetValue(const MacroName, NewValue: TfpgString);
var
  lMacro: TIDEMacro;
begin
  lMacro := FindByName(MacroName);
  if lMacro <> nil then
    lMacro.Value := NewValue;
end;

procedure TIDEMacroList.ResetToDefaults;
begin
  Clear;
  AddDefaults;
  LoadSavedValues;
end;


initialization
  uIDEMacroList := nil;

finalization
  uIDEMacroList.Free;

end.