-package ibex.xt;
+package org.ibex.xt;
import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.StringWriter;
import java.io.Writer;
import java.io.IOException;
+import java.io.FileNotFoundException;
import java.util.*;
-import ibex.util.*;
-import ibex.js.*;
-
-public class Template extends JSElement {
- public static Template parse(String path, Template.Scope s) throws IOException, XML.Exn {
+import org.ibex.util.*;
+import org.ibex.js.*;
+
+// FIXME: replace scope().get("") with containsKey() check on attributes,
+// thereby neatly sidestepping any higher up user defined variables
+// (especially when combined with undeclare()
+public class Template extends JSLeaf.Element {
+ public static Template parse(String path, Template.Scope s) throws FileNotFoundException, IOException {
Reader xmlreader = new BufferedReader(new InputStreamReader(new FileInputStream(path)));
- XML.Document doc = new XML.Document();
+ XML.Document doc = new XML.Document(); // FIXME: switch to Tree.Stream
doc.parse(xmlreader);
return new Template(doc.getRoot(), s);
}
- public static XML.Element wrap(XML.Element e, Template.Scope s) throws IOException, XML.Exn {
+ public static Tree.Leaf wrap(Tree.Leaf leaf, Template.Scope s) throws IOException {
+ if (!(leaf instanceof Tree.Element)) return new Text(leaf);
+
+ Tree.Element e = (Tree.Element)leaf;
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 "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 "redirect": e = new Template.Redirect(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);
+ throw new JSLeaf.Exn("Unknown XT library: "+uri);
} else if (uri.startsWith("local:")) {
- Template t = parse(s.getLocalPath() + uri.substring(6), s);
+ // merge a new template into this tree
+ String path = uri.substring(6) + e.getLocalName() + ".xt";
+ Template t = parse(s.getLocalPath() + path, 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(
+ Tree.Element placeholder = findPlaceholder(t);
+ if (placeholder == null) throw new JSLeaf.Exn(
"<"+e.getQName()+"> attempted to include children into a " +
"template which does not contain an <xt:children /> tag.");
e.getChildren().clear();
}
- // merge original attributes with replacement template
- e = new JSElement.Merge(t, e);
+ // merge the attributes of the template and its representative
+ t.setAttributes(new JSLeaf.MergeAttr(e.getAttributes(), t.getAttributes()));
+
+ // remap the parent of the original element
+ if (e.getParent() != null) {
+ List ch = e.getParent().getChildren();
+ ch.set(ch.indexOf(e), t);
+ }
- } else if (uri.startsWith("java:")) {
- e = new Java(e);
+ return wrap(t, s);
}
+ e = new Template.AttributeEval(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);
+ for (int i=0; i < c.size(); i++) wrap((Tree.Leaf)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;
+ private static Tree.Element findPlaceholder(Tree.Element e) {
+ if ("http://xt.ibex.org/".equals(e.getUri()) && "children".equals(e.getLocalName()))
+ return 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 (!(c.get(i) instanceof Tree.Element)) continue;
+ Tree.Element ret = findPlaceholder((Tree.Element)c.get(i));
if (ret != null) return ret;
}
return null;
}
- private Template.Scope tscope;
+ private transient Template.Scope tscope;
+ private transient JSScope scope = null;
- public Template(XML.Element w, Template.Scope t) { super(w); tscope = t; }
+ public Template(Tree.Element w, Template.Scope t) { super(w); tscope = t; }
- public JSScope getParentScope() { return tscope; }
+ public JSScope scope() { return scope == null ? scope = new JSScope(tscope) : scope; }
- public static final class If extends JSElement {
- public If(XML.Element e) { super(e); }
+ /** Processes ${...} blocks in attributes, loads applicable
+ * attributes into the JS scope and processes global attributes. */
+ public static class AttributeEval extends JSLeaf.Element implements Tree.Attributes {
+ // TODO: hide global attributes from out() function. waiting on util.XMLHelper
+ protected Tree.Attributes a;
+
+ public AttributeEval(Tree.Element wrapped) {
+ super(wrapped);
+ a = wrapped.getAttributes();
+ wrapped.setAttributes(this);
+ }
- public void toXML(Writer w) throws IOException {
- super.toXML(w);
+ 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 && !Boolean.getBoolean((String)varIf)) return;
- } catch (JSExn e) { throw new RuntimeException(e); }
+ // FIXME: questionable abuse of 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 JSLeaf.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()) scope().declare(st.nextToken());
+ continue;
+ //#end
+
+ scope().declare(a.getKey(i));
+ scope().put(a.getKey(i), eval(a.getVal(i)));
+ }
+ } catch (JSExn e) { throw new Exn(e); }
- List c = getChildren();
- for (int i=0; i < c.size(); i++) ((XML.Block)c.get(i)).toXML(w);
+ wrapped.out(w);
}
}
- public static final class JSTag extends JSElement {
- public JSTag(XML.Element e) {
+ public static final class JSTag extends JSLeaf.Element {
+ public JSTag(Tree.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(
+ if (c.get(i) instanceof Tree.Element) throw new JSLeaf.Exn(
"<"+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 void out(Writer w) throws IOException {
+ List c = getChildren();
+ StringWriter s = new StringWriter();
+ for (int i=0; i < c.size(); i++) ((Tree.Leaf)c.get(i)).out(s);
+ exec(s.toString());
}
}
- public static final class ForEach extends JSElement {
- public ForEach(XML.Element e) { super(e); }
-
- public void toXML(Writer w) throws IOException {
- super.toXML(w);
+ public static final class ForEach extends JSLeaf.Element {
+ public ForEach(Tree.Element e) { super(e); }
+ public void out(Writer w) throws IOException {
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;
+ JSScope s = scope();
+ Object varIn = s.get("in"); if (varIn != null) s.undeclare("in");
+ Object varPut = s.get("put"); if (varPut != null) s.undeclare("put");
varIn = exec("return (" + varIn + ");");
- if (varIn == null || (varIn instanceof JSArray)) throw new RuntimeException(
+ if (varIn == null || (varIn instanceof JSArray)) throw new JSLeaf.Exn(
"<"+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(
+ else if (!(varPut instanceof String) || s.get(varPut) != null)
+ throw new JSLeaf.Exn(
"<"+getPrefix()+":foreach> 'put' attribute requires the name of "+
"an undeclared variable, not put='"+varPut+"'.");
- if (get(varPut) != null) throw new RuntimeException(
+ if (scope().get(varPut) != null) throw new JSLeaf.Exn(
"<"+getPrefix()+":foreach> has no 'put' attribute defined and the "+
"default variable 'x' already exists in the current scope.");
List c = getChildren();
- declare((String)varPut);
+ s.declare((String)varPut);
Iterator it = ((JSArray)varIn).toList().iterator(); while (it.hasNext()) {
- put(varPut, it.next());
- for (int i=0; i < c.size(); i++) ((XML.Block)c.get(i)).toXML(w);
+ s.put(varPut, it.next());
+ for (int i=0; i < c.size(); i++) ((Tree.Leaf)c.get(i)).out(w);
}
- } catch (JSExn e) { throw new RuntimeException(e); }
+ } catch (JSExn e) { throw new JSLeaf.Exn(e); }
}
}
- public static final class Children extends JSElement {
- public Children(XML.Element e) { super(e); }
+ public static final class Children extends JSLeaf.Element {
+ public Children(Tree.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 static final class Redirect extends JSLeaf.Element {
+ public Redirect(Tree.Element e) { super(e); }
+
+ public void out(Writer w) throws IOException {
+ try {
+ Object p = scope().get("page"); if (p != null) scope().undeclare("page");
+ if (p == null || !(p instanceof String) || ((String)p).trim().equals(""))
+ throw new JSLeaf.Exn("<"+getPrefix()+":redirect> requires 'page' "+
+ "attribute to be a valid template path");
+ throw new RedirectSignal((String)p);
+ } catch (JSExn e) { throw new JSLeaf.Exn(e); }
+ }
+ }
- public void toXML(Writer w) throws IOException {
- super.toXML(w);
+ // TODO: finish
+ public static final class Transaction extends JSLeaf.Element {
+ private Template.Scope scope;
+ public Transaction(Tree.Element e, Template.Scope s) { super(e); scope = s; }
- // TODO: <xt:use />
- List c = getChildren();
+ public void out(Writer w) throws IOException {
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));
+ List c = getChildren();
+ for (int i=0; i < c.size(); i++) ((Tree.Leaf)c.get(i)).out(sw);
+ StringReader sr = new StringReader(sw.toString());
+
+ JS t;
+ try { t = JS.fromReader("input", 0, sr); }
+ catch (IOException e) { throw new JSLeaf.Exn(e.getMessage()); }
+
+ try {
+ JSScope scope = JS.getParentScope(t);
+
+ Object u = scope().get("use"); if (u != null) scope().undeclare("use");
+ if (u != null) {
+ if (!(u instanceof String)) throw new JSLeaf.Exn(
+ "<"+getPrefix()+":transaction> requires 'use' attribute "+
+ "to be a valid space-seperated list of variables");
+ StringTokenizer st = new StringTokenizer((String)u);
+ while (st.hasMoreTokens()) {
+ String k = st.nextToken();
+ scope.put(k, scope().get(k));
+ }
+ }
+ } catch (JSExn e) { throw new JSLeaf.Exn(e); }
+
scope.transaction(t);
}
}
- public static final class Java extends JSElement {
- // TODO what exactly?
- public Java(XML.Element w) { super(w); }
+ public static final class Text extends JSLeaf {
+ public Text(Tree.Leaf w) { super(w); }
+ public void out(Writer w) throws IOException {
+ StringWriter sw = new StringWriter();
+ super.out(sw);
+ w.write((String)eval(sw.toString()));
+ }
}
public abstract static class Scope extends JSScope {
public abstract void transaction(JS t);
}
+ public static class Signal extends RuntimeException {}
+ public static class ReturnSignal extends Signal { }
+ public static class RedirectSignal extends Signal {
+ protected String target;
+ public RedirectSignal(String target) { super(); this.target = target; }
+ public String getTarget() { return target; }
+ }
}
projects / org.ibex.xt-crawshaw.git / blobdiff