ZInterbaseToken.pas

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{*********************************************************}
{                                                         }
{                 Zeos Database Objects                   }
{        String tokenizing classes for Interbase          }
{                                                         }
{        Originally written by Sergey Seroukhov           }
{                                                         }
{*********************************************************}

{@********************************************************}
{    Copyright (c) 1999-2012 Zeos Development Group       }
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{                                 Zeos Development Group. }
{********************************************************@}

unit ZInterbaseToken;

interface

{$I ZParseSql.inc}

uses
  Classes, ZTokenizer, ZGenericSqlToken, ZPostgreSqlToken;

type

  {** Implements a Interbase-specific number state object. }
  TZInterbaseNumberState = class (TZPostgreSQLNumberState)
  end;

  {** Implements a Interbase-specific quote string state object. }
  TZInterbaseQuoteState = class (TZGenericSQLQuoteState)
  end;

  {**
    This state will either delegate to a comment-handling
    state, or return a token with just a slash in it.
  }
  TZInterbaseCommentState = class (TZCCommentState)
  end;

  {** Implements a symbol state object. }
  TZInterbaseSymbolState = class (TZSymbolState)
  public
    constructor Create;
  end;

  {** Implements a word state object. }
  TZInterbaseWordState = class (TZGenericSQLWordState)
  public
    constructor Create;
  end;

  {** Implements a default tokenizer object. }
  TZInterbaseTokenizer = class (TZTokenizer)
  public
    constructor Create;
  end;

implementation

{ TZInterbaseSymbolState }

{**
  Creates this Interbase-specific symbol state object.
}
constructor TZInterbaseSymbolState.Create;
begin
  inherited Create;
  Add('<=');
  Add('>=');
  Add('<>');
  Add('!=');
  Add('!<');
  Add('!>');
end;

{ TZInterbaseWordState }

{**
  Constructs this Interbase-specific word state object.
}
constructor TZInterbaseWordState.Create;
begin
  SetWordChars(#0, #255, False);
  SetWordChars('a', 'z', True);
  SetWordChars('A', 'Z', True);
  SetWordChars('0', '9', True);
  SetWordChars('_', '_', True);
  SetWordChars('$', '$', True);
end;

{ TZInterbaseTokenizer }

{ TZInterbaseTokenizer }

constructor TZInterbaseTokenizer.Create;
begin
  EscapeState := TZEscapeState.Create;
  WhitespaceState := TZWhitespaceState.Create;

  SymbolState := TZInterbaseSymbolState.Create;
  NumberState := TZInterbaseNumberState.Create;
  QuoteState := TZInterbaseQuoteState.Create;
  WordState := TZInterbaseWordState.Create;
  CommentState := TZInterbaseCommentState.Create;

  SetCharacterState(#0, #32, WhitespaceState);
  SetCharacterState(#33, #191, SymbolState);
  SetCharacterState(#192, High(Char), WordState);

  SetCharacterState('a', 'z', WordState);
  SetCharacterState('A', 'Z', WordState);
  SetCharacterState('_', '_', WordState);
  SetCharacterState('$', '$', WordState);

  SetCharacterState('0', '9', NumberState);
  SetCharacterState('.', '.', NumberState);

  SetCharacterState('"', '"', QuoteState);
  SetCharacterState(#39, #39, QuoteState);

  SetCharacterState('/', '/', CommentState);
end;

end.