[QMacros]教程:使用QMacros从PHP脚本中获取使用的变量名称列表

QMacros 的是一个高效的栈式查找替换引擎，为您提供丰富的功能。下面的代码演示了如何从一段 PHP+HTML 混合代码得到所有的 PHP 定义的变量名（其中源代码放到了Memo1 里，输出的变量名称直接放到了Memo2中）:

Delphi/Pascal

type  TForm1 = class(TForm)    Button1: TButton;    Memo1: TMemo;    Memo2: TMemo;    procedure Button1Click(Sender: TObject);  private    { Private declarations }    procedure DoCodeBlockFound(ASender: TQMacroManager; AName: QStringW;      const AQuoter: QCharW; var AHandled: Boolean);    procedure DoVarNameFound(ASender: TQMacroManager; AName: QStringW;      const AQuoter: QCharW; var AHandled: Boolean);  public    { Public declarations }  end;var  Form1: TForm1;implementation{$R *.dfm}procedure TForm1.Button1Click(Sender: TObject);var  AMacros: TQMacroManager;  AResult: TQMacroComplied;begin  AMacros := TQMacroManager.Create;  try    AList.Duplicates := dupIgnore;    AMacros.OnMacroMissed := DoCodeBlockFound;    //Complie is enough    AResult := AMacros.Complie(Memo1.Text, '');    if Assigned(AResult) then //We don't use the result for replace,so free it.      FreeAndNil(AResult);  finally    AMacros.Free;  end;end;procedure TForm1.DoCodeBlockFound(ASender: TQMacroManager; AName: QStringW;  const AQuoter: QCharW; var AHandled: Boolean);var  AVarParser: TQMacroManager;  AReplace: TQMacroComplied;begin  AVarParser := TQMacroManager.Create;  try    AVarParser.OnMacroMissed := DoVarNameFound;    AReplace := AVarParser.Complie(AName, '$', '', MRF_END_WITH_INVALID_CHAR);    if AReplace <> nil then    begin      ASender.Push(AName, '');      AHandled := True;      FreeAndNil(AReplace);    end;  finally    FreeAndNil(AVarParser);  end;end;procedure TForm1.DoVarNameFound(ASender: TQMacroManager; AName: QStringW;  const AQuoter: QCharW; var AHandled: Boolean);begin  Memo2.Lines.Add(AName);  ASender.Push(AName, '');  AHandled := True;end;

type  TForm1 = class(TForm)    Button1: TButton;    Memo1: TMemo;    Memo2: TMemo;    procedure Button1Click(Sender: TObject);  private    { Private declarations }    procedure DoCodeBlockFound(ASender: TQMacroManager; AName: QStringW;      const AQuoter: QCharW; var AHandled: Boolean);    procedure DoVarNameFound(ASender: TQMacroManager; AName: QStringW;      const AQuoter: QCharW; var AHandled: Boolean);  public    { Public declarations }  end; var  Form1: TForm1; implementation {$R *.dfm} procedure TForm1.Button1Click(Sender: TObject);var  AMacros: TQMacroManager;  AResult: TQMacroComplied;begin  AMacros := TQMacroManager.Create;  try    AList.Duplicates := dupIgnore;    AMacros.OnMacroMissed := DoCodeBlockFound;    //Complie is enough    AResult := AMacros.Complie(Memo1.Text, '');    if Assigned(AResult) then //We don't use the result for replace,so free it.      FreeAndNil(AResult);  finally    AMacros.Free;  end;end; procedure TForm1.DoCodeBlockFound(ASender: TQMacroManager; AName: QStringW;  const AQuoter: QCharW; var AHandled: Boolean);var  AVarParser: TQMacroManager;  AReplace: TQMacroComplied;begin  AVarParser := TQMacroManager.Create;  try    AVarParser.OnMacroMissed := DoVarNameFound;    AReplace := AVarParser.Complie(AName, '$', '', MRF_END_WITH_INVALID_CHAR);    if AReplace <> nil then    begin      ASender.Push(AName, '');      AHandled := True;      FreeAndNil(AReplace);    end;  finally    FreeAndNil(AVarParser);  end;end; procedure TForm1.DoVarNameFound(ASender: TQMacroManager; AName: QStringW;  const AQuoter: QCharW; var AHandled: Boolean);begin  Memo2.Lines.Add(AName);  ASender.Push(AName, '');  AHandled := True;end;

把界面贴出来给大家便于对照着看：

好了，我们在 Button1 的 OnClick 事件里响应函数 Button1Click 里做了这么点事：

• 创建了 TMacroManager 对象的实例 AMacros，然后设置其 OnMacroMissed 事件的响应函数，指向 DoCodeBlockFound 函数，用于找到以 结束的代码块。DoCodeBlockFound 函数做了进一步的处理：
  • 创建了一个 TQMacroManager 对象的实例，然后设置其 OnMacroMissed 事件的响应函数指向 DoVarNameFound。在 DoVarNameFound 里，我们将找到的变量名输出到Memo2中。
• 调用 AMacros 的 Complie 方法，解析源代码，找到 PHP 代码块，由于我们没有入栈任何代码块的宏定义，所以它会触发 OnMacroMissed 事件的响应函数 DoCodeBlockFound，从而引发进一步的处理，完成变量名称的输入任务。

注意一点，我们在 OnMacroMissed 事件的处理中，都入栈了 AName 命名的参数，并设置 AHandled 为 True，以避免 QMacros 后面的默认处理代码。

好了，代码的简单解读就到这里，实际上很一目了然。这里看一下效果：