introduce global attribute processing

[org.ibex.xt-crawshaw.git] / src / java / org / ibex / xt / Template.java

diff --git a/src/java/org/ibex/xt/Template.java b/src/java/org/ibex/xt/Template.java
index 4ab16d6..7f75bd2 100644 (file)
--- a/src/java/org/ibex/xt/Template.java
+++ b/src/java/org/ibex/xt/Template.java
@@ -25,7 +25,9 @@ public class Template extends JSElement {
     public static XML.Element wrap(XML.Element e, Template.Scope s) throws IOException {
         final String uri = e.getUri();
 
-        if (uri.equals("http://xt.ibex.org/")) {
+        if (uri == null) {
+            // do nothing
+        } else if (uri.equals("http://xt.ibex.org/")) {
             //#switch(e.getLocalName())
             case "js":          e = new Template.JSTag(e); break;
             case "foreach":     e = new Template.ForEach(e); break;
@@ -68,15 +70,7 @@ public class Template extends JSElement {
             return wrap(merged, s);
         }
 
-        XML.Attributes a = e.getAttributes();
-        for (int i=0; i < a.attrSize(); i++) {
-            // FIXME: questionable abuse of XML namespaces here
-            if ("if".equals(a.getKey(i)) && (
-                "http://xt.ibex.org/".equals(e.getUri()) ||
-                "http://xt.ibex.org/".equals(a.getUri(i)))) {
-                e = new Template.IfWrap(e);
-            }
-        }
+        e = new Template.AttributeEval(e);
 
         // wrap children
         List c = e.getChildren();
@@ -106,16 +100,48 @@ public class Template extends JSElement {
 
     public JSScope getParentScope() { return tscope; }
 
-    public static final class IfWrap extends JSElement {
-        public IfWrap(XML.Element e) { super(e); }
 
-        public void out(Writer w) throws IOException {
-            loadAttr();
+    /** Processes ${...} blocks in attributes, loads applicable
+     *  attributes into the JS scope and processes global attributes. */
+    public static class AttributeEval extends JSElement implements XML.Attributes {
+        protected XML.Attributes a;
+
+        public AttributeEval(XML.Element wrapped) { super(wrapped); a = wrapped.getAttributes(); }
 
+        public XML.Attributes getAttributes() { return this; }
+
+        public int getIndex(String q) { return a.getIndex(q); }
+        public int getIndex(String u, String k) { return a.getIndex(u, k); }
+        public String getKey(int i) { return a.getKey(i); }
+        public String getVal(int i) { return (String)eval(a.getVal(i)); }
+        public String getUri(int i) { return a.getUri(i); }
+        public String getPrefix(int i) { return a.getPrefix(i); }
+        public String getQName(int i) { return a.getQName(i); }
+        public int attrSize() { return a.attrSize(); }
+
+        public void out(Writer w) throws IOException {
             try {
-                Object varIf = get("if"); if (varIf != null) undeclare("if");
-                if (varIf != null && !"true".equals(varIf)) return;
-            } catch (JSExn e) { throw new JSElement.Exn(e); }
+                // FIXME: questionable abuse of XML namespaces here
+                boolean xturi = "http://xt.ibex.org/".equals(getUri());
+                for(int i=0; i < a.attrSize(); i++) {
+                    if (!xturi && !"http://xt.ibex.org/".equals(a.getUri(i))) continue;
+
+                    //#switch (a.getKey(i))
+                    case "if": if (!"true".equals(eval(a.getVal(i)))) return;
+                    case "declare":
+                        Object d = eval(a.getVal(i));
+                        if (!(d instanceof String)) throw new JSElement.Exn(
+                            "attribute "+getPrefix()+":declare can only contain a "+
+                            "space seperated list of variable names to declare.");
+                        StringTokenizer st = new StringTokenizer((String)d, " ");
+                        while (st.hasMoreTokens()) declare(st.nextToken());
+                        continue;
+                    //#end
+
+                    declare(a.getKey(i));
+                    put(a.getKey(i), eval(a.getVal(i)));
+                }
+            } catch (JSExn e) { throw new Exn(e); }
 
             wrapped.out(w);
         }
@@ -131,8 +157,6 @@ public class Template extends JSElement {
         }
 
         public void out(Writer w) throws IOException {
-            loadAttr();
-
             List c = getChildren();
             StringWriter s = new StringWriter();
             for (int i=0; i < c.size(); i++) ((Tree.Leaf)c.get(i)).out(s);
@@ -144,8 +168,6 @@ public class Template extends JSElement {
         public ForEach(XML.Element e) { super(e); }
 
         public void out(Writer w) throws IOException {
-            loadAttr();
-
             try {
                 Object varIn = get("in"); if (varIn != null) undeclare("in");
                 Object varPut = get("put"); if (varPut != null) undeclare("put");
@@ -183,8 +205,6 @@ public class Template extends JSElement {
         public Redirect(XML.Element e) { super(e); }
 
         public void out(Writer w) throws IOException {
-            loadAttr();
-
             try {
                 Object p = get("page"); if (p != null) undeclare("page");
                 if (p == null || !(p instanceof String) || ((String)p).trim().equals(""))
@@ -201,8 +221,6 @@ public class Template extends JSElement {
         public Transaction(XML.Element e, Template.Scope s) { super(e); scope = s;} // TODO: check kids
 
         public void out(Writer w) throws IOException {
-            loadAttr();
-
             // TODO: <xt:use />
             List c = getChildren();
             StringWriter sw = new StringWriter();