slacker.cpp

来自「压缩包里有教材<<C++模式设计-基于QT4开源跨平台开发框架&gt」· C++ 代码 · 共 72 行

#include <slacker.h>
#include <QTextStream>
/*
  Overridden from DomWalker (base class), this virtual method
  is called from WalkTree on each node. 
  */

//start  
QDomElement Slacker::visit(QDomElement element) {
    QString name = element.tagName();
    //end
    /* mapping attributes - any c= becomes condition= */ 
    QString cvalue = element.attribute("c", QString()) ;
    if (cvalue != QString()) {
        element.setAttribute("condition", cvalue);
        element.setAttribute("c", QString());
    }
    /* For any condition= attribute, add a role=  */
    cvalue = element.attribute("condition", QString());
    if (cvalue != QString()) {
        element.setAttribute("role", cvalue);
    }
    //start
    /* Mapping elements: */
    if (name == "p") {
        element.setTagName("para");
        return element;
    }
    if (name == "ul") {
        element.setTagName("unorderedlist");
        return element;
    }
    if (name == "b") {
        element.setAttribute("role", "strong");
        element.setTagName("emphasis");
        return element;
    }
    /* This transformation is more interesting because we
      replace <li> text </li> with 
      <listitem><para> text </para></listitem>
    */
    if (name == "li") {
        QDomNode parent = element.parentNode();
        QDomElement listitem = createElement("listitem");
        parent.replaceChild(listitem, element); /*
           remove the li tag, but put a listitem in its place */
        element.setTagName("para");  /* Recall that the element 
           is the original <li>text</li> node. */
        listitem.appendChild(element);
        return listitem;
    }//end
    
    if (name == "include") { /* replaces the entire <include> 
        node with the contents of a referenced file */
        QDomNode parent = element.parentNode();
        QString filename = element.attribute("src");
        FILE *f = fopen(filename.toAscii(), "r");
        if (f==0) {
            return element;
        }
        QTextStream stream(f, QIODevice::ReadOnly);
        QString text = stream.readAll();
        QDomText tn = this->m_Doc.createTextNode(text);
        QDomElement pl = createElement("programlisting");
        parent.replaceChild(pl, element);
        pl.appendChild(tn);
        return pl;
    }
    return element;
}