--- /dev/null
+package ibex.xt;
+
+import ibex.util.XML;
+import org.ibex.js.JS;
+import org.ibex.js.JSScope;
+
+import ibex.collection.*;
+import java.util.*;
+
+import java.io.StringReader;
+import java.io.Writer;
+import java.io.IOException;
+
+public class JSElement extends JSScope implements XML.Element {
+ protected XML.Element wrapped;
+
+ /** Creates an Element around <tt>wrapped</tt>, replacing
+ * references to it in its parent and children with this object. */
+ public JSElement(XML.Element wrapped) {
+ super(findScope(wrapped));
+ this.wrapped = wrapped;
+
+ // remap parent and children
+ if (wrapped.getParent() != null) {
+ List c = wrapped.getParent().getChildren();
+ c.remove(wrapped); c.add(this);
+ }
+ List c = wrapped.getChildren();
+ for (int i=c.size(); i >= 0; i--) ((XML.Block)c.get(i)).setParent(this);
+ }
+
+ public void toXML(Writer w) throws IOException {
+ // grab all related attributes
+ try {
+ XML.Attributes a = getAttributes();
+ for(int i=0; i < a.attrSize(); i++) {
+ if (!"http://xt.ibex.org/".equals(a.getUri(i))) continue;
+ declare(a.getKey(i));
+ put(a.getKey(i), eval(a.getVal(i)));
+ }
+ } catch (Exception e) { throw new RuntimeException(e); }
+ }
+
+ private Object eval(String s) {
+ if (s == null) return null;
+ StringBuffer ret = new StringBuffer();
+ while (s.indexOf("${") != -1) {
+ ret.append(s.substring(0, s.indexOf("${")));
+ String s2 = s.substring(s.indexOf("${")+2);
+ Object app = exec("return (" + s2.substring(0, s2.indexOf('}')) + ");\n");
+ s = s.substring(s.indexOf('}') + 1);
+
+ if (!(app == null ||
+ app instanceof String ||
+ app instanceof Number ||
+ app instanceof Boolean))
+ throw new RuntimeException("javascripts within ${...} can only return " +
+ "strings, numbers, and booleans; not a " +
+ app.getClass().getName());
+
+ ret.append(app == null ? "null" : app.toString());
+ }
+ ret.append(s);
+ return ret.toString();
+ }
+
+ public Object exec(String s) {
+ try {
+ return JS.eval(JS.cloneWithNewParentScope(
+ JS.fromReader("input", 0, new StringReader(s)), this));
+ } catch (Exception e) {
+ e.printStackTrace();
+ throw new RuntimeException(e);
+ }
+ }
+
+ // Pass Through ///////////////////////////////////////////////////////////
+
+ public void setParent(XML.Element p) { wrapped.setParent(p); }
+ public XML.Element getParent() { return wrapped.getParent(); }
+ public XML.Attributes getAttributes() { return wrapped.getAttributes(); }
+ public XML.Prefixes getPrefixes() { return wrapped.getPrefixes(); }
+ public List getChildren() { return wrapped.getChildren(); }
+ public String getQName() { return wrapped.getQName(); }
+ public String getLocalName() { return wrapped.getLocalName(); }
+ public String getPrefix() { return wrapped.getPrefix(); }
+ public String getUri() { return wrapped.getUri(); }
+
+ /** Works up the Element object model until an instance of a JSScope is found. */
+ private static JSScope findScope(XML.Element e) {
+ while (e != null && !(e instanceof JSScope)) e = e.getParent();
+ return (JSScope)e;
+ }
+
+ /** A JSElement with the element attributes merged with a second
+ * element.
+ *
+ * All functions of the XML.Element interface are mapped onto the
+ * primary element, except <tt>getAttributes()</tt>. This function
+ * returns a MergedAttr instance with the <b>secondary</b> element
+ * acting as the primary attribute source.
+ */
+ public static class Merge extends JSElement {
+ private final XML.Attributes a;
+ public Merge(XML.Element wrapped, XML.Element merge) {
+ super(wrapped);
+ a = new MergeAttr(merge.getAttributes(), wrapped.getAttributes());
+ }
+ public XML.Attributes getAttributes() { return a; }
+ }
+
+ /** Creates a single view onto two sets of Attributes, first
+ * checking the <tt>primary</tt> array for an entry, or
+ * otherwise returning any matching entry in the
+ * <tt>secondary</tt> Attributes object.
+ *
+ * FIXME: toXML() produces invalid XML if qname in both a and b.
+ */
+ public static final class MergeAttr implements XML.Attributes {
+ private final XML.Attributes a, b;
+ public MergeAttr(XML.Attributes primary, XML.Attributes secondary) {
+ a = primary; b = secondary;
+ }
+ public int getIndex(String qname) {
+ int i = a.getIndex(qname); if (i >= 0) return i;
+ i = b.getIndex(qname); if (i >= 0) return i + a.attrSize();
+ return -1;
+ }
+ public int getIndex(String uri, String key) {
+ int i = a.getIndex(uri, key); if (i >= 0) return i;
+ i = b.getIndex(uri, key); if (i >= 0) return i + b.attrSize();
+ return -1;
+ }
+ public String getKey(int i) {
+ return i >= a.attrSize() ? b.getKey(i-a.attrSize()) : a.getKey(i); }
+ public String getVal(int i) {
+ return i >= a.attrSize() ? b.getVal(i-a.attrSize()) : a.getVal(i); }
+ public String getUri(int i) {
+ return i >= a.attrSize() ? b.getUri(i-a.attrSize()) : a.getUri(i); }
+ public String getPrefix(int i) {
+ return i >= a.attrSize() ? b.getUri(i-a.attrSize()) : a.getUri(i); }
+ public String getQName(int i) {
+ return i >= a.attrSize() ? b.getUri(i-a.attrSize()) : a.getUri(i); }
+ public int attrSize() { return a.attrSize() + b.attrSize(); }
+ }
+}
projects / org.ibex.xt-crawshaw.git / blobdiff