+++ /dev/null
-package edu.berkeley.sbp.misc;
-import java.io.*;
-import java.util.*;
-import java.lang.reflect.*;
-import edu.berkeley.sbp.*;
-import edu.berkeley.sbp.misc.*;
-import edu.berkeley.sbp.tib.*;
-import edu.berkeley.sbp.chr.*;
-import edu.berkeley.sbp.util.*;
-
-public class ReflectiveGrammar /*extends MetaGrammar*/ {
- /*
- final Class baseClass;
- public ReflectiveGrammar(Class baseClass) { this.baseClass = baseClass; }
-
- public Object convertLabel(String label) { return new ClassMark(label); }
- public Object repeatTag() { return arrayMark; }
-
- private static class ArrayMark { }
- private static final ArrayMark arrayMark = new ArrayMark();
-
- private static class ClassMark {
- public final String clazz;
- public ClassMark(String clazz) { this.clazz = clazz; }
- public String toString() { return clazz+"$"; }
- }
-
- public String stringify(Tree<Object> t) throws Exception {
- StringBuffer ret = new StringBuffer();
- for(int i=0; i<t.numChildren(); i++) {
- Tree<Object> child = t.child(i);
- Object head = child.numChildren() > 0 ? buildHead(child, String.class) : child.head();
- if (head!=null) ret.append(head);
- }
- return ret.toString();
- }
-
- public Object build(Tree<Object> t) throws Exception { return buildHead(t, null); }
- public Object buildHead(Tree<Object> t, Class c) throws Exception {
- //System.out.println("buildHead " + (c==null?null:c.getName()) + " " + t);
- Object h = t.head();
-
- if (h != null && h instanceof ClassMark) {
- String clazz = ReflectiveWalker.mangle(((ClassMark)h).clazz);
- Class c2 = (c!=null && c.getName().endsWith("$"+clazz)) ? c : Reflection.forNameOrNull(baseClass.getName()+"$"+clazz);
- if (c2!=null) return buildBody(t, c2);
- for(Method m : baseClass.getMethods()) {
- if (!m.getName().equals(clazz)) continue;
- Object[] o = new Object[m.getParameterTypes().length];
- for(int i=0; i<o.length; i++)
- o[i] = i>=t.numChildren() ? null : buildHead(t.child(i), m.getParameterTypes()[i]);
- return m.invoke(null, o);
- }
- throw new RuntimeException("couldn't figure out what to invoke for ClassMark " + clazz);
- } else if (h==arrayMark && c==null) {
- c = Object[].class;
- }
- if (c.isArray()) {
- Object[] ret = new Object[t.numChildren()];
- for(int i=0; i<ret.length; i++)
- ret[i] = buildHead(t.child(i), c.getComponentType());
- return Reflection.lub(ret);
- }
- if (c==String.class) return stringify(t);
- if (c==int.class) { String s = stringify(t); if (s==null||"".equals(s)) return new Integer(0); return new Integer(s); }
- if (h==null) return buildBody(t, c);
-
- if (t.numChildren() > 0)
- throw new RuntimeException("can't buildHead() on a tree with children when the head is of type " +
- h.getClass().getName() + "(c=="+(c==null?"null":c.getName())+")");
- return h;
- }
-
- public Object buildBody(Tree<Object> t, Class c) throws Exception {
- //System.out.println("buildBody " + (c==null?null:c.getName()) + " " + t);
- c = resolveClass(t, c);
- if (c==null) return buildHead(t, null);
- Object o = c.newInstance();
- Field[] f = c.getFields();
- OUTER: for(int i=0; i<t.numChildren(); i++) {
- Object label = t.label(i);
- Field field = null;
- if (label!=null) field = Reflection.getField(c, label+"");
- if (field==null && label != null)
- for(Method m : c.getMethods())
- if (m.getName().equals(label)) {
- m.invoke(o, new Object[] { buildHead(t.child(i), m.getParameterTypes()[0]) });
- continue OUTER;
- }
- if (field==null && label==null) {
- field = Reflection.getField(c, 0);
- }
- if (field==null) {
- System.err.println("warning: skipping field " + label + " ("+i+") on class " + c.getName());
- System.err.println(" tree: " + t);
- }
- else {
- Object tgt = Reflection.rebuild(buildHead(t.child(i), field.getType()), field.getType());
- //if (tgt instanceof Object[]) tgt = Reflection.lub(tgt);
- //System.err.println("setting field " + field.getName() + " on " + c.getName() + " to " + tgt);
- try {
- field.set(o, tgt);
- } catch (Exception e) {
- e.printStackTrace();
- }
- }
- }
- return o;
- }
-
- public Class resolveClass(Tree<Object> t, Class c) throws Exception {
- if (c==null) return null;
- if (c==int.class) return c;
- if (c==String.class) return c;
- //System.out.println("resolving " + c.getName());
- if (Reflection.isConcrete(c)) return c;
- Class ret = null;
- Class[] subs = (Class[])c.getField("subclasses").get(null);
- OUTER: for(int i=0; i<subs.length; i++) {
- //System.err.println("trying " + subs[i].getName());
- for(int j=0; j<t.numChildren(); j++)
- if (Reflection.getField(subs[i], t.label(j)+"")==null) {
- //System.err.println("skipping due to " + t.label(j));
- continue OUTER;
- }
- if (ret != null)
- throw new RuntimeException("couldn't decide between two classes:\n " + subs[i].getName() + "\n " + ret.getName());
- ret = subs[i];
- }
- if (t.head()==null) return null;
- if (ret==null) throw new RuntimeException("couldn't find a class to match tree: " + t);
- return ret;
- }
- */
-}
projects / sbp.git / blobdiff