// ============================================================================
// This file is generated by the Delphi Parser Generator.
// ----------------------------------------------------------------------------
// DPG version: 1.0.1.0d
// Grammar:     calcLexer
// ============================================================================
unit calcLexer;

interface

uses
   calcLexerTokens,
   Classes,
   Contnrs,
   dpgLexer,
   dpgToken,
   dpgTypes,
   SysUtils;

type
   // =========================================================================
   // Class TcalcLexer declaration
   // =========================================================================
   TcalcLexer = class( TdpgLexer)
   
   protected // Public grammar rules ("rescoped")
      procedure mLPAREN ( pCreate: boolean);
      procedure mRPAREN ( pCreate: boolean);
      procedure mPLUS   ( pCreate: boolean);
      procedure mMINUS  ( pCreate: boolean);
      procedure mSTAR   ( pCreate: boolean);
      procedure mSLASH  ( pCreate: boolean);
      procedure mSEMI   ( pCreate: boolean);
      procedure mINT    ( pCreate: boolean);
      procedure mWS     ( pCreate: boolean);
   
   public
      function  NextToken: IdpgToken; override;
   end;

implementation
uses
   dpgException,
   dpgExceptionSemantic,
   dpgExceptionMismatchedChar;

// ============================================================================
// mLPAREN
// ============================================================================
procedure TcalcLexer.mLPAREN( pCreate: boolean);
var
   _begin: integer;
   _save: integer;
   _token: IdpgToken;
   _ttype: integer;

begin
   _begin   := Length( fText) +1;
   _token   := nil;
   _ttype   := TT_LPAREN;
   
   match('(');
   
   if (_ttype <> TT_SKIP) and (pCreate = true) then
   begin
      _token            := makeToken( _ttype);
      _token.TokenText  := Copy( fText, _begin, Length(fText)-_begin+1);
   end;
   
   fReturnToken := _token;
end;

// ============================================================================
// mRPAREN
// ============================================================================
procedure TcalcLexer.mRPAREN( pCreate: boolean);
var
   _begin: integer;
   _save: integer;
   _token: IdpgToken;
   _ttype: integer;

begin
   _begin   := Length( fText) +1;
   _token   := nil;
   _ttype   := TT_RPAREN;
   
   match(')');
   
   if (_ttype <> TT_SKIP) and (pCreate = true) then
   begin
      _token            := makeToken( _ttype);
      _token.TokenText  := Copy( fText, _begin, Length(fText)-_begin+1);
   end;
   
   fReturnToken := _token;
end;

// ============================================================================
// mPLUS
// ============================================================================
procedure TcalcLexer.mPLUS( pCreate: boolean);
var
   _begin: integer;
   _save: integer;
   _token: IdpgToken;
   _ttype: integer;

begin
   _begin   := Length( fText) +1;
   _token   := nil;
   _ttype   := TT_PLUS;
   
   match('+');
   
   if (_ttype <> TT_SKIP) and (pCreate = true) then
   begin
      _token            := makeToken( _ttype);
      _token.TokenText  := Copy( fText, _begin, Length(fText)-_begin+1);
   end;
   
   fReturnToken := _token;
end;

// ============================================================================
// mMINUS
// ============================================================================
procedure TcalcLexer.mMINUS( pCreate: boolean);
var
   _begin: integer;
   _save: integer;
   _token: IdpgToken;
   _ttype: integer;

begin
   _begin   := Length( fText) +1;
   _token   := nil;
   _ttype   := TT_MINUS;
   
   match('-');
   
   if (_ttype <> TT_SKIP) and (pCreate = true) then
   begin
      _token            := makeToken( _ttype);
      _token.TokenText  := Copy( fText, _begin, Length(fText)-_begin+1);
   end;
   
   fReturnToken := _token;
end;

// ============================================================================
// mSTAR
// ============================================================================
procedure TcalcLexer.mSTAR( pCreate: boolean);
var
   _begin: integer;
   _save: integer;
   _token: IdpgToken;
   _ttype: integer;

begin
   _begin   := Length( fText) +1;
   _token   := nil;
   _ttype   := TT_STAR;
   
   match('*');
   
   if (_ttype <> TT_SKIP) and (pCreate = true) then
   begin
      _token            := makeToken( _ttype);
      _token.TokenText  := Copy( fText, _begin, Length(fText)-_begin+1);
   end;
   
   fReturnToken := _token;
end;

// ============================================================================
// mSLASH
// ============================================================================
procedure TcalcLexer.mSLASH( pCreate: boolean);
var
   _begin: integer;
   _save: integer;
   _token: IdpgToken;
   _ttype: integer;

begin
   _begin   := Length( fText) +1;
   _token   := nil;
   _ttype   := TT_SLASH;
   
   match('/');
   
   if (_ttype <> TT_SKIP) and (pCreate = true) then
   begin
      _token            := makeToken( _ttype);
      _token.TokenText  := Copy( fText, _begin, Length(fText)-_begin+1);
   end;
   
   fReturnToken := _token;
end;

// ============================================================================
// mSEMI
// ============================================================================
procedure TcalcLexer.mSEMI( pCreate: boolean);
var
   _begin: integer;
   _save: integer;
   _token: IdpgToken;
   _ttype: integer;

begin
   _begin   := Length( fText) +1;
   _token   := nil;
   _ttype   := TT_SEMI;
   
   match(';');
   
   if (_ttype <> TT_SKIP) and (pCreate = true) then
   begin
      _token            := makeToken( _ttype);
      _token.TokenText  := Copy( fText, _begin, Length(fText)-_begin+1);
   end;
   
   fReturnToken := _token;
end;

// ============================================================================
// mINT
// ============================================================================
procedure TcalcLexer.mINT( pCreate: boolean);
var
   _begin: integer;
   _cnt_10: integer;
   _save: integer;
   _token: IdpgToken;
   _ttype: integer;

begin
   _begin   := Length( fText) +1;
   _token   := nil;
   _ttype   := TT_INT;
   
   _cnt_10 := 0;
   
   while(true) do
   begin
      if (( LA(1) in ['0'..'9'])) then
      begin
         match( ['0'..'9']);
      end
      
      else
      begin
         if _cnt_10 >= 1 then
            break
         else
            Raise EdpgMismatchedChar.Create( LA(1), ['0'..'9'], FileName, Line, Column);
      end;
      
      INC(_cnt_10);
   end;
   
   if (_ttype <> TT_SKIP) and (pCreate = true) then
   begin
      _token            := makeToken( _ttype);
      _token.TokenText  := Copy( fText, _begin, Length(fText)-_begin+1);
   end;
   
   fReturnToken := _token;
end;

// ============================================================================
// mWS
// ============================================================================
procedure TcalcLexer.mWS( pCreate: boolean);
var
   _begin: integer;
   _save: integer;
   _token: IdpgToken;
   _ttype: integer;

begin
   _begin   := Length( fText) +1;
   _token   := nil;
   _ttype   := TT_WS;
   
   if (( LA(1) in [#13])) then
   begin
      match(#13);
      match(#10);
      newLine;
   end
   
   else if (( LA(1) in [#13])) then
   begin
      match(#13);
      newLine;
   end
   
   else if (( LA(1) in [#10])) then
   begin
      match(#10);
      newLine;
   end
   
   else if (( LA(1) in [#9])) then
   begin
      match(#9);
      tab;
   end
   
   else if (( LA(1) in [' '])) then
   begin
      match(' ');
   end
   
   else
      Raise EdpgMismatchedChar.Create( LA(1), [#9..#10,#13,' '], FileName, Line, Column);
   _ttype := TT_SKIP;
   
   if (_ttype <> TT_SKIP) and (pCreate = true) then
   begin
      _token            := makeToken( _ttype);
      _token.TokenText  := Copy( fText, _begin, Length(fText)-_begin+1);
   end;
   
   fReturnToken := _token;
end;

// ----------------------------------------------------------------------------
// NextToken
// ----------------------------------------------------------------------------
function TcalcLexer.NextToken : IdpgToken;
var
   _first   : TdpgCharSet;

begin
   _first := [#9..#10,#13,' ','('..'+','-','/'..'9',';'];
   
   while( true) do
   begin
      ResetText;
      
      try
         if (( LA(1) in ['('])) then
         begin
            mLPAREN(true);
            result := fReturnToken;
         end
         
         else if (( LA(1) in [')'])) then
         begin
            mRPAREN(true);
            result := fReturnToken;
         end
         
         else if (( LA(1) in ['+'])) then
         begin
            mPLUS(true);
            result := fReturnToken;
         end
         
         else if (( LA(1) in ['-'])) then
         begin
            mMINUS(true);
            result := fReturnToken;
         end
         
         else if (( LA(1) in ['*'])) then
         begin
            mSTAR(true);
            result := fReturnToken;
         end
         
         else if (( LA(1) in ['/'])) then
         begin
            mSLASH(true);
            result := fReturnToken;
         end
         
         else if (( LA(1) in [';'])) then
         begin
            mSEMI(true);
            result := fReturnToken;
         end
         
         else if (( LA(1) in ['0'..'9'])) then
         begin
            mINT(true);
            result := fReturnToken;
         end
         
         else if (( LA(1) in [#9..#10,#13,' '])) then
         begin
            mWS(true);
            result := fReturnToken;
         end
         
         else
         begin
            if LA(1) = EOF_CHAR then
            begin
               uponEof;
               result := TdpgToken.Create(TT_EOF);
            end
            
            else
               Raise EdpgMismatchedChar.Create(LA(1), _first, FileName, Line, Column);
         end;
         
         // --------------------------------------------------------------
         // If we found a SKIP token, then try again...
         // --------------------------------------------------------------
         if result = nil then
            continue;
            
         // --------------------------------------------------------------
         // Now we have a valid token, so exit the function
         // --------------------------------------------------------------
         break;
         
      except
         Raise;
      end;
   end;
end;

end.