--- /dev/null
+package org.ibex.xt;
+
+import java.io.Serializable;
+import java.io.StringReader;
+import java.io.Writer;
+import java.io.OutputStream;
+import java.io.IOException;
+import java.util.*;
+
+import org.ibex.util.*;
+import org.ibex.js.JS;
+import org.ibex.js.JSScope;
+import org.ibex.js.JSExn;
+
+public class JSLeaf implements Tree.Leaf, Serializable {
+ private transient JSScope scope = null;
+ protected Tree.Leaf wrapped;
+
+ /** Creates a Leaf around <tt>wrapped</tt>, replacing
+ * references to it in its parent with this object. */
+ public JSLeaf(Tree.Leaf wrapped) {
+ this.wrapped = wrapped;
+
+ // remap parent and children
+ if (wrapped.getParent() != null) {
+ List c = wrapped.getParent().getChildren();
+ c.set(c.indexOf(wrapped), this);
+ }
+ }
+
+ public JSScope scope() {
+ if (scope == null) {
+ Tree.Leaf e = wrapped;
+ while (e != null && !(e instanceof JSLeaf)) e = e.getParent();
+ scope = new JSScope(e == null ? null : ((JSLeaf)e).scope());
+ }
+
+ return scope;
+ }
+
+ public void out(OutputStream o) throws IOException { wrapped.out(o); }
+ public void out(Writer w) throws IOException { wrapped.out(w); }
+
+ protected 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 Exn("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();
+ }
+
+ protected Object exec(String s) {
+ try {
+ return JS.eval(JS.cloneWithNewParentScope(
+ JS.fromReader("input", 0, new StringReader(s)), scope()));
+ } catch (IOException e) {
+ e.printStackTrace();
+ throw new Exn("error parsing script", e);
+ } catch (JSExn e) {
+ throw new Exn(e);
+ }
+ }
+
+ // Pass Through ///////////////////////////////////////////////////////////
+
+ public void setParent(Tree.Node p) { wrapped.setParent(p); }
+ public Tree.Node getParent() { return wrapped.getParent(); }
+
+ public static class Node extends JSLeaf implements Tree.Node {
+ public Node(Tree.Node wrapped) {
+ super(wrapped);
+ List c = wrapped.getChildren();
+ for (int i=0; i < c.size(); i++) ((Tree.Leaf)c.get(i)).setParent(this);
+ }
+
+ public List getChildren() { return ((Tree.Node)wrapped).getChildren(); }
+ }
+
+ public static class Element extends Node implements Tree.Element {
+ public Element(Tree.Element wrapped) { super(wrapped); }
+
+ public Tree.Attributes getAttributes() { return ((Tree.Element)wrapped).getAttributes(); }
+ public Tree.Prefixes getPrefixes() { return ((Tree.Element)wrapped).getPrefixes(); }
+
+ public String getQName() { return ((Tree.Element)wrapped).getQName(); }
+ public String getLocalName() { return ((Tree.Element)wrapped).getLocalName(); }
+ public String getPrefix() { return ((Tree.Element)wrapped).getPrefix(); }
+ public String getUri() { return ((Tree.Element)wrapped).getUri(); }
+ }
+
+ /** A JSLeaf.Element with the element attributes merged with a second
+ * element.
+ *
+ * All functions of the Tree.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 Element {
+ private final Tree.Attributes a;
+ public Merge(Tree.Element wrapped, Tree.Element merge) {
+ super(wrapped);
+ a = new MergeAttr(merge.getAttributes(), wrapped.getAttributes());
+ }
+ public Tree.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: out(Writer) produces invalid XML if qname in both a and b.
+ * create org.ibex.util.XMLHelper and have a proper version of
+ * this as a subclass.
+ */
+ public static final class MergeAttr implements Tree.Attributes {
+ private final Tree.Attributes a, b;
+ public MergeAttr(Tree.Attributes primary, Tree.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(); }
+ }
+
+ public static class Exn extends RuntimeException {
+ public Exn(String cause) { super(cause); }
+ public Exn(JSExn e) { super(e); }
+ public Exn(String msg, Exception e) { super(msg + ": " + e.getMessage()); }
+ public String toString() { return "JSElement.Exn: "+getMessage(); }
+ }
+}
projects / org.ibex.xt-crawshaw.git / blobdiff