3 import java.io.StringReader;
5 import java.io.OutputStream;
6 import java.io.IOException;
9 import org.ibex.util.*;
10 import org.ibex.js.JS;
11 import org.ibex.js.JSScope;
12 import org.ibex.js.JSExn;
14 public class JSElement extends JSScope implements XML.Element {
15 protected XML.Element wrapped;
17 /** Creates an Element around <tt>wrapped</tt>, replacing
18 * references to it in its parent and children with this object. */
19 public JSElement(XML.Element wrapped) {
20 super(findScope(wrapped));
21 this.wrapped = wrapped;
23 // remap parent and children
24 if (wrapped.getParent() != null) {
25 List c = wrapped.getParent().getChildren();
26 c.set(c.indexOf(wrapped), this);
28 List c = wrapped.getChildren();
29 for (int i=0; i < c.size(); i++) ((Tree.Leaf)c.get(i)).setParent(this);
32 public void out(OutputStream o) throws IOException { wrapped.out(o); }
33 public void out(Writer w) throws IOException { wrapped.out(w); }
35 protected Object eval(String s) {
36 if (s == null) return null;
37 StringBuffer ret = new StringBuffer();
38 while (s.indexOf("${") != -1) {
39 ret.append(s.substring(0, s.indexOf("${")));
40 String s2 = s.substring(s.indexOf("${")+2);
41 Object app = exec("return (" + s2.substring(0, s2.indexOf('}')) + ");\n");
42 s = s.substring(s.indexOf('}') + 1);
45 app instanceof String ||
46 app instanceof Number ||
47 app instanceof Boolean))
48 throw new Exn("javascripts within ${...} can only return " +
49 "strings, numbers, and booleans; not a " +
50 app.getClass().getName());
52 ret.append(app == null ? "null" : app.toString());
55 return ret.toString();
58 public Object exec(String s) {
60 return JS.eval(JS.cloneWithNewParentScope(
61 JS.fromReader("input", 0, new StringReader(s)), this));
62 } catch (IOException e) {
64 throw new Exn("error parsing script", e);
70 // Pass Through ///////////////////////////////////////////////////////////
72 public void setParent(Tree.Node p) { wrapped.setParent(p); }
73 public Tree.Node getParent() { return wrapped.getParent(); }
74 public XML.Attributes getAttributes() { return wrapped.getAttributes(); }
75 public XML.Prefixes getPrefixes() { return wrapped.getPrefixes(); }
76 public List getChildren() { return wrapped.getChildren(); }
77 public String getQName() { return wrapped.getQName(); }
78 public String getLocalName() { return wrapped.getLocalName(); }
79 public String getPrefix() { return wrapped.getPrefix(); }
80 public String getUri() { return wrapped.getUri(); }
82 /** Works up the Element object model until an instance of a JSScope is found. */
83 private static JSScope findScope(Tree.Node e) {
84 while (e != null && !(e instanceof JSScope)) e = e.getParent();
88 /** A JSElement with the element attributes merged with a second
91 * All functions of the XML.Element interface are mapped onto the
92 * primary element, except <tt>getAttributes()</tt>. This function
93 * returns a MergedAttr instance with the <b>secondary</b> element
94 * acting as the primary attribute source.
96 public static class Merge extends JSElement {
97 private final XML.Attributes a;
98 public Merge(XML.Element wrapped, XML.Element merge) {
100 a = new MergeAttr(merge.getAttributes(), wrapped.getAttributes());
102 public XML.Attributes getAttributes() { return a; }
105 /** Creates a single view onto two sets of Attributes, first
106 * checking the <tt>primary</tt> array for an entry, or
107 * otherwise returning any matching entry in the
108 * <tt>secondary</tt> Attributes object.
110 * FIXME: toXML() produces invalid XML if qname in both a and b.
112 public static final class MergeAttr implements XML.Attributes {
113 private final XML.Attributes a, b;
114 public MergeAttr(XML.Attributes primary, XML.Attributes secondary) {
115 a = primary; b = secondary;
117 public int getIndex(String qname) {
118 int i = a.getIndex(qname); if (i >= 0) return i;
119 i = b.getIndex(qname); if (i >= 0) return i + a.attrSize();
122 public int getIndex(String uri, String key) {
123 int i = a.getIndex(uri, key); if (i >= 0) return i;
124 i = b.getIndex(uri, key); if (i >= 0) return i + b.attrSize();
127 public String getKey(int i) {
128 return i >= a.attrSize() ? b.getKey(i-a.attrSize()) : a.getKey(i); }
129 public String getVal(int i) {
130 return i >= a.attrSize() ? b.getVal(i-a.attrSize()) : a.getVal(i); }
131 public String getUri(int i) {
132 return i >= a.attrSize() ? b.getUri(i-a.attrSize()) : a.getUri(i); }
133 public String getPrefix(int i) {
134 return i >= a.attrSize() ? b.getUri(i-a.attrSize()) : a.getUri(i); }
135 public String getQName(int i) {
136 return i >= a.attrSize() ? b.getUri(i-a.attrSize()) : a.getUri(i); }
137 public int attrSize() { return a.attrSize() + b.attrSize(); }
140 public static class Exn extends RuntimeException {
141 public Exn(String cause) { super(cause); }
142 public Exn(JSExn e) { super(e); }
143 public Exn(String msg, Exception e) { super(msg + ": " + e.getMessage()); }
144 public String toString() { return "JSElement.Exn: "+getMessage(); }