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unit PreProcessorExpressionTokens;
{(*}
(*------------------------------------------------------------------------------
Delphi Code formatter source code
The Original Code is PreProcessorExpressionTokens, released August 2003.
The Initial Developer of the Original Code is Anthony Steele.
Portions created by Anthony Steele are Copyright (C) 2003 Anthony Steele.
All Rights Reserved.
Contributor(s): Anthony Steele.
The contents of this file are subject to the Mozilla Public License Version 1.1
(the "License"). you may not use this file except in compliance with the License.
You may obtain a copy of the License at http://www.mozilla.org/NPL/
Software distributed under the License is distributed on an "AS IS" basis,
WITHOUT WARRANTY OF ANY KIND, either express or implied.
See the License for the specific language governing rights and limitations
under the License.
Alternatively, the contents of this file may be used under the terms of
the GNU General Public License Version 2 or later (the "GPL")
See http://www.gnu.org/licenses/gpl.html
------------------------------------------------------------------------------*)
{*)}
{$I JcfGlobal.inc}
interface
{
AFS 26 Aug 2003
Delphi preprocessor $IF expression parsing
tokens defined via an enum, an item class
and a list class
}
uses Contnrs;
type
TPreProcessorSymbol =
(eNone, eIdentifier,
// symbols with fixed text
eOpenBracket, eCloseBracket, eDefined, eDeclared,
eAnd, eOr, eNot, eTrue, eFalse);
{ used to recognise tokens - all expect identifiers have fixed text }
const
SYMBOL_DATA: array[eOpenBracket .. eFalse] of string =
('(', ')', 'defined', 'declared', 'and', 'or', 'not', 'true', 'false');
type
TPreProcessorExpressionToken = class(TObject)
private
feSymbol: TPreProcessorSymbol;
fsSourceCode: string;
public
property Symbol: TPreProcessorSymbol Read feSymbol Write feSymbol;
property SourceCode: string Read fsSOurceCode Write fsSourceCode;
end;
TPreProcessorExpressionTokenList = class(TObject)
private
fcList: TObjectList;
function GetItems(const piIndex: integer): TPreProcessorExpressionToken;
function GetCount: integer;
public
constructor Create;
destructor Destroy; override;
function Add(const peSymbol: TPreProcessorSymbol;
psText: string): TPreProcessorExpressionToken;
procedure Clear;
property Items[const piIndex: integer]: TPreProcessorExpressionToken Read GetItems;
property Count: integer Read GetCount;
end;
function PreProcessorSymbolToString(const peSymbol: TPreProcessorSymbol): string;
implementation
uses SysUtils;
function PreProcessorSymbolToString(const peSymbol: TPreProcessorSymbol): string;
begin
case peSymbol of
eNone:
Result := 'No symbol';
eIdentifier:
Result := 'identifier';
eOpenBracket:
Result := '(';
eCloseBracket:
Result := ')';
eDefined:
Result := 'defined';
eAnd:
Result := 'and';
eOr:
Result := 'or';
eNot:
Result := 'not';
eTrue:
Result := 'true';
eFalse:
Result := 'false';
else
Assert(False);
end;
end;
{ TPreProcessorExpressionTokenList }
function TPreProcessorExpressionTokenList.Add(const peSymbol: TPreProcessorSymbol;
psText: string): TPreProcessorExpressionToken;
begin
Result := TPreProcessorExpressionToken.Create;
Result.Symbol := peSymbol;
Result.SourceCode := psText;
fcList.Add(Result);
end;
procedure TPreProcessorExpressionTokenList.Clear;
begin
fcList.Clear;
end;
constructor TPreProcessorExpressionTokenList.Create;
begin
inherited;
// thiws is an owning list
fcList := TObjectList.Create;
end;
destructor TPreProcessorExpressionTokenList.Destroy;
begin
FreeAndNil(fcList);
inherited;
end;
function TPreProcessorExpressionTokenList.GetCount: integer;
begin
Result := fcList.Count;
end;
function TPreProcessorExpressionTokenList.GetItems(
const piIndex: integer): TPreProcessorExpressionToken;
begin
if piIndex < fcList.Count then
Result := TPreProcessorExpressionToken(fcList[piIndex])
else
Result := nil;
end;
end.
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