{
    fpGUI IDE - Maximus

    Copyright (C) 2012 - 2013 Graeme Geldenhuys

    See the file COPYING.modifiedLGPL, included in this distribution,
    for details about redistributing fpGUI.

    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.

    Description:
      ---
}

unit ideutils;

{$mode objfpc}{$H+}

interface

uses
  Classes
  ,SysUtils
  ,fpg_base
  ,fpg_widget
  ;



// Set the Screen.Cursor to crHourGlass until the interface goes out of scope
function TempHourGlassCursor(var AWidget: TfpgWidget): IInterface;


function tiNumToken(const AValue, AToken: string): integer;
function tiToken(const AValue, AToken: string; const APos: integer): string;
procedure ShowString(const AString: TfpgString; const AHeading: TfpgString);

// Extract the file extension from FileName and return it in all UPPERCASE.
function ExtractUpperFileExt(const FileName: string): string;

// Transforms all consecutive sequences of #10, #13, #32, and #9 in Str
// into a single space, and strips off whitespace at the beginning and
// end of the string
function CompressWhiteSpace(const Str: string): string;

// See if a string begins/ends with a specific substring
function StrBeginsWith(const SubStr, Str: string; CaseSensitive: Boolean = True): Boolean;
function StrEndsWith(const SubStr, Str: string; CaseSensitive: Boolean = True): Boolean;
// See is a string contains another substring
function StrContains(const SubStr, Str: string; CaseSensitive: Boolean = True): Boolean;

// Find SubString in S; do not consider case;
// this works exactly the same as the Pos function,
// except for case-INsensitivity.
function CaseInsensitivePos(Pat, Text: PChar): Integer; overload;
function CaseInsensitivePos(const Pat, Text: string): Integer; overload;
function AnsiCaseInsensitivePos(const SubString, S: string): Integer;

procedure MakeASCIICharTable;
procedure Initialize;

function IsCharAlpha(ch: Char): Boolean;
function IsCharUpper(ch: Char): Boolean;
function IsCharLower(ch: Char): Boolean;
function IsCharAlphaNumeric(ch: Char): Boolean;

// Emulates the VB $Right function to obtain up to n of the
// rightmost characters in a string.
function RightString(const Value: string; NumChars: Integer): string;

function IsPas(const FileName: string): Boolean;
function IsInc(const FileName: string): Boolean;
function IsProgram(const FileName: string): Boolean;

{ Handles key shortcuts like Ctrl+Ins or Ctrl+Del to add or remove grid rows.
  We add this here, so we can reuse it all over in the IDE. }
procedure CheckGridModifyKeyPresses(Sender: TObject; var KeyCode: word; var ShiftState: TShiftState; var Consumed: boolean);



implementation

uses
  fpg_form
  ,fpg_memo
  ,fpg_grid
  ,fpg_main
  ,fpg_utils
  ,dbugintf
  ;

var
  LocaleIdentifierChars: set of Char;
  ASCIICharTable: array [#0..#255] of Byte;

const
  EmptyString = '';
  GxIdentChars       = ['A'..'Z', 'a'..'z', '0'..'9', '_'];
  GxIdentStartChars  = ['A'..'Z', 'a'..'z', '0'..'9'];
  GxAlphaChars       = ['A'..'Z', 'a'..'z'];
  GxUpperAlphaChars  = ['A'..'Z'];
  GxLowerAlphaChars  = ['a'..'z'];
  GxSentenceEndChars = ['.', '!', '?'];

  SAllAlphaNumericChars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890';


type
  { once it goes out of scope, it restores the mouse cursor }
  TTempHourClassCursor = class(TInterfacedObject, IInterface)
  private
    FOldCursor: TMouseCursor;
    FWidget: TfpgWidget;
  public
    constructor Create(var AWidget: TfpgWidget);
    destructor Destroy; override;
  end;

constructor TTempHourClassCursor.Create(var AWidget: TfpgWidget);
begin
  inherited Create;
  FOldCursor := AWidget.MouseCursor;
  FWidget := AWidget;
  AWidget.MouseCursor := mcHourGlass;
end;

destructor TTempHourClassCursor.Destroy;
begin
  FWidget.MouseCursor := FOldCursor;
  inherited Destroy;
end;



function TempHourGlassCursor(var AWidget: TfpgWidget): IInterface;
begin
  Result := TTempHourClassCursor.Create(AWidget) as IInterface;
end;

function tiNumToken(const AValue, AToken : string): integer;
var
  i, iCount : integer;
  lsValue : string;
begin
  Result := 0;
  if AValue = '' then
    Exit; //==>

  iCount := 0;
  lsValue := AValue;
  i := pos(AToken, lsValue);
  while i <> 0 do begin
    delete(lsValue, i, length(AToken));
    inc(iCount);
    i := pos(AToken, lsValue);
  end;
  Result := iCount + 1;
end;


function tiToken(const AValue, AToken : string; const APos : integer): string;
var
  i, iCount, iNumToken : integer;
  lsValue : string;
begin
  result := '';

  iNumToken := tiNumToken(AValue, AToken);
  if APos = 1 then
  begin
    if pos(AToken, AValue) = 0 then
      result := AValue
    else
      result := copy(AValue, 1, pos(AToken, AValue)-1);
  end
  else if (iNumToken < APos-1) or (APos<1) then
  begin
    result := '';
  end
  else
  begin
    { Remove leading blocks }
    iCount := 1;
    lsValue := AValue;
    i := pos(AToken, lsValue);
    while (i<>0) and (iCount<APos) do
    begin
      delete(lsValue, 1, i + length(AToken) - 1);
      inc(iCount);
      i := pos(AToken, lsValue);
    end;

    if (i=0) and (iCount=APos) then
      result := lsValue
    else if (i=0) and (iCount<>APos) then
      result := ''
    else
      result := copy(lsValue, 1, i-1);
  end;
end;

procedure ShowString(const AString: TfpgString; const AHeading: TfpgString);
var
  lForm: TfpgForm;
  lMemo: TfpgMemo;
begin
  lForm := TfpgForm.Create(nil);
  lMemo := TfpgMemo.Create(lForm);
  try
    lForm.WindowTitle := AHeading;
    lForm.Width       := 450;
    lForm.Height      := 250;
    lForm.WindowPosition := wpOneThirdDown;
    lForm.Name        := 'FormShowStrings';
    lMemo.Lines.Text  := AString;
    lMemo.FontDesc    := '#Edit2';
    lMemo.SetPosition(0, 0, lForm.Width, lForm.Height);
    lMemo.Align       := alClient;
    lForm.ShowModal;
  finally
    lForm.free;
  end;
end;

function ExtractUpperFileExt(const FileName: string): string;
begin
  Result := UpperCase(fpgExtractFileExt(FileName));
end;

function CompressWhiteSpace(const Str: string): string;
var
  i: Integer;
  Len: Integer;
  NextResultChar: Integer;
  CheckChar: Char;
  NextChar: Char;
begin
  Len := Length(Str);
  NextResultChar := 1;
  SetLength(Result, Len);

  for i := 1 to Len do
  begin
    CheckChar := Str[i];
    {$RANGECHECKS OFF}
    NextChar := Str[i + 1];
    {$RANGECHECKS ON}
    case CheckChar of
      #9, #10, #13, #32:
        begin
          if (NextChar in [#0, #9, #10, #13, #32]) or (NextResultChar = 1) then
            Continue
          else
          begin
            Result[NextResultChar] := #32;
            Inc(NextResultChar);
          end;
        end;
      else
        begin
          Result[NextResultChar] := Str[i];
          Inc(NextResultChar);
        end;
    end;
  end;
  if Len = 0 then
    Exit;
  SetLength(Result, NextResultChar - 1);
end;

function StrBeginsWith(const SubStr, Str: string; CaseSensitive: Boolean): Boolean;
begin
  if CaseSensitive then
    Result := Pos(SubStr, Str) = 1
  else
    Result := CaseInsensitivePos(SubStr, Str) = 1;
end;

function StrEndsWith(const SubStr, Str: string; CaseSensitive: Boolean): Boolean;
begin
  if CaseSensitive then
    Result := RightString(Str, Length(SubStr)) = SubStr
  else
    Result := SameText(RightString(Str, Length(SubStr)), SubStr);
end;

function StrContains(const SubStr, Str: string; CaseSensitive: Boolean): Boolean;
begin
  if CaseSensitive then
    Result := Pos(SubStr, Str) > 0
  else
    Result := CaseInsensitivePos(SubStr, Str) > 0;
end;

function CaseInsensitivePos(Pat, Text: PChar): Integer;
var
  RunPat, RunText, PosPtr: PChar;
begin
  Result := 0;
  RunPat := Pat;
  RunText := Text;
  while RunText^ <> #0 do
  begin
    if (ASCIICharTable[RunPat^] = ASCIICharTable[RunText^]) then
    begin
      PosPtr := RunText;
      while RunPat^ <> #0 do
      begin
        if ASCIICharTable[RunPat^] <> ASCIICharTable[RunText^] then
          Break;
        Inc(RunPat);
        Inc(RunText);
      end;
      if RunPat^ = #0 then
      begin
        Result := PosPtr - Text + 1;
        Break;
      end;
    end
    else
      Inc(RunText);
    RunPat := Pat;
  end;
end;

function CaseInsensitivePos(const Pat, Text: string): Integer; overload;
begin
  Result := CaseInsensitivePos(PChar(Pat), PChar(Text));
end;

function AnsiCaseInsensitivePos(const SubString, S: string): Integer;
begin
  Result := AnsiPos(AnsiUpperCase(SubString), AnsiUpperCase(S));
end;

procedure MakeASCIICharTable;
var
  i: Integer;
begin
  for i := 0 to 255 do
  begin
    If (I > 64) and (I < 91) then
      ASCIICharTable[Char(I)] := i + 32
    else
      ASCIICharTable[Char(I)] := i;
  end;
end;

procedure Initialize;
var
  i: Char;
begin
  for i := Low(Char) to High(Char) do
    if IsCharAlphaNumeric(i) then
      Include(LocaleIdentifierChars, i);
  Include(LocaleIdentifierChars, '_');
  MakeASCIICharTable;
end;

function IsCharAlpha(ch: Char): Boolean;
begin
 Result := (ch in GxAlphaChars);
end;

function IsCharUpper(ch: Char): Boolean;
begin
  Result := (ch in GxUpperAlphaChars);
end;

function IsCharLower(ch: Char): Boolean;
begin
  Result := (ch in GxLowerAlphaChars);
end;

function IsCharAlphaNumeric(ch: Char): Boolean;
begin
  Result := (ch in GxIdentStartChars);
end;

function RightString(const Value: string; NumChars: Integer): string;
begin
  Result := Copy(Value, (Length(Value) - NumChars) + 1, NumChars);
end;

function IsPas(const FileName: string): Boolean;
var
  FileExt: string;
begin
  FileExt := ExtractUpperFileExt(FileName);
  Result := (FileExt = '.PAS');
end;

function IsInc(const FileName: string): Boolean;
var
  FileExt: string;
begin
  FileExt := ExtractUpperFileExt(FileName);
  Result := (FileExt = '.INC');
end;

function IsProgram(const FileName: string): Boolean;
var
  FileExt: string;
begin
  FileExt := ExtractUpperFileExt(FileName);
  Result := (FileExt = '.LPR') or (FileExt = '.DPR');
end;

procedure CheckGridModifyKeyPresses(Sender: TObject; var KeyCode: word;
    var ShiftState: TShiftState; var Consumed: boolean);
var
  grd: TfpgStringGrid;
  r: integer;
begin
  grd := TfpgStringGrid(Sender);
  if (KeyCode = keyInsert) and (ssCtrl in ShiftState) then
  begin
    grd.RowCount := grd.RowCount + 1;
    Consumed := True;
    Exit;
  end
  else if (KeyCode = keyDelete) and (ssCtrl in ShiftState) then
  begin
    if grd.RowCount = 0 then
      Exit;
    r := grd.FocusRow;
    grd.DeleteRow(r);
    if (grd.RowCount <> 0) and (grd.RowCount > r) then
      grd.FocusRow := r // focus what was next row
    else if (grd.RowCount <> 0) and (grd.RowCount <= r) then
      grd.FocusRow := r-1; // focus what was previous row
    Consumed := True;
    Exit;
  end;
end;


initialization
  Initialize;

end.