-// Copyright 2006 all rights reserved; see LICENSE file for BSD-style license
+// Copyright 2006-2007 all rights reserved; see LICENSE file for BSD-style license
package edu.berkeley.sbp;
import edu.berkeley.sbp.util.*;
Iterable<Sequence> needs() { return needs; }
Iterable<Sequence> hates() { return hates; }
- Position firstp() { return firstp; }
- Position lastp() { return firstp().last(); }
+ Pos firstp() { return firstp; }
+ Pos lastp() { return firstp().last(); }
public Iterator<Element> iterator() { return new ArrayIterator<Element>(elements); }
protected Sequence(Element[] elements) {
for(int i=0; i<elements.length; i++)
if (elements[i]==null)
throw new RuntimeException("cannot have nulls in a sequence: " + this);
- this.firstp = new Position(0, null);
+ this.firstp = new Position(this, 0, null);
}
- abstract Forest epsilonForm(Input.Region loc, Grammar cache);
+ abstract Forest epsilonForm(Input.Region loc);
protected abstract <T> Forest<T> postReduce(Input.Region loc, Forest<T>[] args, Position p);
// Position //////////////////////////////////////////////////////////////////////////////
static abstract class Pos implements IntegerMappable, Comparable<Pos>, Serializable {
+
+ public int ord = -1;
+ private transient Sequence owner;
+
+ public int ord() { return ord; }
+
final Forest[] holder;
- Pos(int len) { this.holder = new Forest[len]; }
+
+ Pos(int len, Sequence owner) {
+ this.owner = owner;
+ this.holder = new Forest[len];
+ }
public abstract int provides();
public abstract int[] needs();
public abstract int[] hates();
public abstract boolean owner_needed_or_hated();
+ public abstract boolean isFirst();
+ public abstract boolean isLast();
+ public abstract Pos last();
+ public abstract Pos prev();
+ public abstract Pos next();
+
+ /** the element which produces the sequence to which this Position belongs */
+ public Sequence owner() { return owner; }
+
+ abstract Element element();
+
public abstract int numPops();
- public abstract <T> Forest<T> rewrite(Input.Region loc, Grammar cache);
+ public abstract <T> Forest<T> rewrite(Input.Region loc);
}
/** the imaginary position before or after an element of a sequence; corresponds to an "LR item" */
- class Position extends Pos implements IntegerMappable {
+ private static class Position extends Pos implements IntegerMappable {
/*
public Pos getPos() {
return new DumbPos(elements.length, provides(), needs(), hates(), owner_needed_or_hated(), numPops(),
public int[] hates();
public boolean owner_needed_or_hated();
public int numPops();
- public <T> Forest<T> rewrite(Input.Region loc, Grammar cache)
+ public <T> Forest<T> rewrite(Input.Region loc)
};
}
*/
- public int ord = -1;
- public int ord() { return ord; }
public int numPops() { return pos; }
- final int pos;
- private final Position next;
- private final Position prev;
+ final int pos;
+ private final Position next;
+ private final Position prev;
public int provides() { return owner().sernum; }
public int[] needs() { return owner().needs_int(); }
public int[] hates() { return owner().hates_int(); }
public boolean owner_needed_or_hated() { return owner().needed_or_hated; }
- private Position(int pos, Position prev) {
- super(elements.length);
+ private Position(Sequence owner, int pos, Position prev) {
+ super(owner.elements.length,owner);
this.pos = pos;
- this.next = pos==elements.length ? null : new Position(pos+1, this);
+ this.next = pos==owner.elements.length ? null : new Position(owner, pos+1, this);
this.prev = prev;
}
return ord - ((Position)p).ord;
}
- boolean isFirst() { return pos==0; }
+ public boolean isFirst() { return pos==0; }
public int pos() { return pos; }
/** the element immediately after this Position, or null if this is the last Position */
- public Element element() { return pos>=elements.length ? null : elements[pos]; }
-
- /** the element which produces the sequence to which this Position belongs */
- public Sequence owner() { return Sequence.this; }
+ public Element element() { return pos>=owner().elements.length ? null : owner().elements[pos]; }
/** the next Position (the Position after <tt>this.element()</tt>) */
public Position next() { return next; }
// Position /////////////////////////////////////////////////////////////////////////////////
- public final <T> Forest<T> rewrite(Input.Region loc, Grammar cache) {
- if (this==firstp()) epsilonForm(loc, cache);
+ public final <T> Forest<T> rewrite(Input.Region loc) {
+ if (isFirst()) return owner().epsilonForm(loc);
for(int i=0; i<pos; i++) if (holder[i]==null) throw new Error("realbad " + i);
- for(int i=pos; i<elements.length; i++) {
- if (holder[i]==null) holder[i] = ((Union)elements[i]).epsilonForm(loc, cache);
+ for(int i=pos; i<owner().elements.length; i++) {
+ if (holder[i]==null) holder[i] = ((Union)owner().elements[i]).epsilonForm(loc);
if (holder[i]==null) throw new Error("bad");
}
- return Sequence.this.postReduce(loc, holder, this);
+ return owner().postReduce(loc, holder, this);
}
public String toString() {
StringBuffer ret = new StringBuffer();
ret.append("<{");
- for(Position p = Sequence.this.firstp(); p != null; p = p.next()) {
+ for(Position p = (Position)owner().firstp(); p != null; p = p.next()) {
ret.append(' ');
if (p==this) ret.append(" | ");
if (p.element()!=null) ret.append(p.element());
return sb;
}
-
// Specialized Subclasses //////////////////////////////////////////////////////////////////////////////
static class Singleton extends Sequence {
public Singleton(Element[] e, int idx) { super(e); this.idx = idx; }
public <T> Forest<T> postReduce(Input.Region loc, Forest<T>[] args, Position p) { return args[idx]; }
Sequence _clone() { return new Singleton(elements,idx); }
- Forest epsilonForm(Input.Region loc, Grammar cache) {
- return ((Union)elements[idx]).epsilonForm(loc, cache);
+ Forest epsilonForm(Input.Region loc) {
+ return ((Union)elements[idx]).epsilonForm(loc);
}
}
if (spacing) for(int i=0; i<50-len; i++) sb.append(' ');
return sb;
}
- Forest epsilonForm(Input.Region loc, Grammar cache) {
+ Forest epsilonForm(Input.Region loc) {
return Forest.create(loc, tag, new Forest[0], lifts);
}
}
projects / sbp.git / blobdiff