--- /dev/null
+package ibex.xt;
+
+import ibex.js.*;
+import ibex.util.*;
+import java.util.*;
+
+import java.io.BufferedReader;
+import java.io.FileInputStream;
+import java.io.InputStreamReader;
+import java.io.Reader;
+import java.io.StringReader;
+import java.io.StringWriter;
+import java.io.Writer;
+import java.io.IOException;
+
+
+public class Template extends JSElement {
+ public static Template parse(String path, Template.Scope s) throws IOException, XML.Exn {
+ Reader xmlreader = new BufferedReader(new InputStreamReader(new FileInputStream(path)));
+ XML.Document doc = new XML.Document();
+ doc.parse(xmlreader);
+ return new Template(doc.getRoot(), s);
+ }
+
+ public static XML.Element wrap(XML.Element e, Template.Scope s) throws IOException, XML.Exn {
+ final String uri = e.getUri();
+
+ if (uri.equals("http://xt.ibex.org/")) {
+ //#switch(e.getLocalName())
+ case "if": e = new Template.If(e); break;
+ case "js": e = new Template.JSTag(e); break;
+ case "foreach": e = new Template.ForEach(e); break;
+ case "children": e = new Template.Children(e); break;
+ case "transaction": e = new Template.Transaction(e, s); break;
+ //#end
+
+ } else if (uri.startsWith("http://xt.ibex.org/")) {
+ //#switch(uri.substring(19))
+ case "io": System.out.println("ibex.xt.io not yet implemented"); // TODO
+ //#end
+ throw new RuntimeException("Unknown XT library: "+uri);
+
+ } else if (uri.startsWith("local:")) {
+ Template t = parse(s.getLocalPath() + uri.substring(6), s);
+
+ List c = e.getChildren();
+ if (c.size() > 0) {
+ // move all children from e to placeholder
+ XML.Element placeholder = findPlaceholder(t);
+ if (placeholder == null) throw new RuntimeException(
+ "<"+e.getQName()+"> attempted to include children into a " +
+ "template which does not contain an <xt:children /> tag.");
+
+ placeholder.getChildren().addAll(e.getChildren());
+ e.getChildren().clear();
+ }
+
+ // merge original attributes with replacement template
+ e = new JSElement.Merge(t, e);
+
+ } else if (uri.startsWith("java:")) {
+ e = new Java(e);
+ }
+
+ // wrap children
+ List c = e.getChildren();
+ for (int i=0; i < c.size(); i++)
+ if (c.get(i) instanceof XML.Element) wrap((XML.Element)c.get(i), s);
+
+ return e;
+ }
+
+ /** Returns the first Template.Children child found. */
+ private static Template.Children findPlaceholder(XML.Element e) {
+ if (e instanceof Template.Children) return (Template.Children)e;
+ List c = e.getChildren();
+ for (int i=0; i < c.size(); i++) {
+ if (!(c.get(i) instanceof XML.Element)) continue;
+ Template.Children ret = findPlaceholder((XML.Element)c.get(i));
+ if (ret != null) return ret;
+ }
+ return null;
+ }
+
+ private Template.Scope tscope;
+
+ public Template(XML.Element w, Template.Scope t) { super(w); tscope = t; }
+
+ public JSScope getParentScope() { return tscope; }
+
+
+ public static final class If extends JSElement {
+ public If(XML.Element e) { super(e); }
+
+ public void toXML(Writer w) throws IOException {
+ super.toXML(w);
+
+ try {
+ Object varIf = get("if"); if (varIf != null) undeclare("if");
+ if (varIf != null && !Boolean.getBoolean((String)varIf)) return;
+ } catch (JSExn e) { throw new RuntimeException(e); }
+
+ List c = getChildren();
+ for (int i=0; i < c.size(); i++) ((XML.Block)c.get(i)).toXML(w);
+ }
+ }
+
+ public static final class JSTag extends JSElement {
+ public JSTag(XML.Element e) {
+ super(e);
+ List c = getChildren();
+ for (int i=0; i < c.size(); i++)
+ if (c.get(i) instanceof XML.Element) throw new RuntimeException(
+ "<"+getPrefix()+":js> tags may not have child elements");
+ }
+
+ public void toXML(Writer w) throws IOException {
+ super.toXML(w);
+
+ try {
+ Object varIf = get("if"); if (varIf != null) undeclare("if");
+ if (varIf != null && !Boolean.getBoolean((String)varIf)) return;
+
+ List c = getChildren();
+ StringWriter s = new StringWriter();
+ for (int i=0; i < c.size(); i++) ((XML.Block)c.get(i)).toXML(s);
+ exec(s.toString());
+ } catch (JSExn e) { throw new RuntimeException(e); }
+ }
+ }
+
+ public static final class ForEach extends JSElement {
+ public ForEach(XML.Element e) { super(e); }
+
+ public void toXML(Writer w) throws IOException {
+ super.toXML(w);
+
+ try {
+ Object varIn = get("in"); if (varIn != null) undeclare("in");
+ Object varPut = get("put"); if (varPut != null) undeclare("put");
+ Object varIf = get("if"); if (varIf != null) undeclare("if");
+ if (varIf != null && !Boolean.getBoolean((String)varIf)) return;
+
+ varIn = exec("return (" + varIn + ");");
+ if (varIn == null || (varIn instanceof JSArray)) throw new RuntimeException(
+ "<"+getPrefix()+":foreach> requires attribute 'in' to specify " +
+ "the name of a valid js array in the current scope, not in='"+varIn+"'.");
+
+ if (varPut == null) varPut = "x";
+ else if (!(varPut instanceof String) || get(varPut) != null)
+ throw new RuntimeException(
+ "<"+getPrefix()+":foreach> 'put' attribute requires the name of "+
+ "an undeclared variable, not put='"+varPut+"'.");
+ if (get(varPut) != null) throw new RuntimeException(
+ "<"+getPrefix()+":foreach> has no 'put' attribute defined and the "+
+ "default variable 'x' already exists in the current scope.");
+
+ List c = getChildren();
+
+ declare((String)varPut);
+ Vec v = ((JSArray)varIn).toVec();
+ for (int j=0; j < v.size(); j++) {
+ put(varPut, v.elementAt(j));
+ for (int i=0; i < c.size(); i++) ((XML.Block)c.get(i)).toXML(w);
+ }
+ } catch (JSExn e) { throw new RuntimeException(e); }
+ }
+ }
+
+ public static final class Children extends JSElement {
+ public Children(XML.Element e) { super(e); }
+ }
+
+ // TODO: finish
+ public static final class Transaction extends JSElement {
+ private final Template.Scope scope; // FIXME: HACK. unstatisise all tags, or do this to all
+ public Transaction(XML.Element e, Template.Scope s) { super(e); scope = s;} // TODO: check kids
+
+ public void toXML(Writer w) throws IOException {
+ super.toXML(w);
+
+ // TODO: <xt:use />
+ List c = getChildren();
+ StringWriter sw = new StringWriter();
+ for (int i=0; i < c.size(); i++) ((XML.Block)c.get(i)).toXML(sw);
+ JS t = JS.fromReader("input", 0, new StringReader(sw.toString()));
+ t = JS.cloneWithNewParentScope(t, new JSScope(null));
+ scope.transaction(t);
+ }
+ }
+
+ public static final class Java extends JSElement {
+ // TODO what exactly?
+ public Java(XML.Element w) { super(w); }
+ }
+
+ public abstract static class Scope extends JSScope {
+ public Scope(JSScope j) { super(j); }
+
+ /** Returns the template path for local:/ namespace. */
+ public abstract String getLocalPath();
+
+ /** Registers a new Prevayler transaction. */
+ public abstract void transaction(JS t);
+ }
+
+}
projects / org.ibex.xt-crawshaw.git / blobdiff