// Copyright 2006 all rights reserved; see LICENSE file for BSD-style license
package edu.berkeley.sbp.meta;
import edu.berkeley.sbp.util.*;
import edu.berkeley.sbp.*;
import java.io.*;
import java.util.*;
import java.lang.reflect.*;
import java.lang.ref.*;
/** currently this class exports only static methods to create repetitions; there are no public instance methods or constructors */
public class Repeat extends Union {
public Repeat(final Element e, boolean zeroOkay, boolean manyOkay, Object tag) {
this(e, zeroOkay, manyOkay, null, false, tag); }
public Repeat(final Element e, boolean zeroOkay, boolean manyOkay, final Element separator, Object tag) {
this(e, zeroOkay, manyOkay, separator, false, tag); }
protected Repeat(final Element e, boolean zeroOkay, boolean manyOkay, final Element separator, boolean maximal, Object tag) {
this(e, zeroOkay, manyOkay, separator, maximal, tag, null); }
protected Repeat(final Element e, boolean zeroOkay, boolean manyOkay, final Element separator, boolean maximal, Object tag, Atom follow) {
super(e
+(!manyOkay
? "?"
: (zeroOkay
? (maximal ? "**" : "*")
: (maximal ? "++" : "+")))
+(separator==null
? ""
: ("/"+separator)),
true);
if (zeroOkay && !manyOkay) {
// FIXME
add(Sequence.create(tag, new Element[] { }, null, false).followedBy(follow));
add(Sequence.create(tag, new Element[] { e }, null, false).followedBy(follow));
} else if (zeroOkay) {
add(Sequence.create(tag, new Element[] { }, null, false).followedBy(follow));
//add(new Sequence.Constant.Empty());
// FUGLY
add(Sequence.create(many1(e, separator, tag)).followedBy(follow));
} else {
add(Sequence.create(tag, new Element[] { e }, null, false).followedBy(follow));
if (separator==null)
add(Sequence.create(tag, new Element[] { e, Repeat.this }, new boolean[] { false, false }, true).followedBy(follow));
else
add(Sequence.create(tag, new Element[] { e, separator, Repeat.this }, new boolean[] { false, true, false }, true).followedBy(follow));
}
}
public static class Maximal extends Repeat {
public Maximal(final Element e, boolean zeroOkay, boolean manyOkay, final Atom separator, Object tag) {
super(e, zeroOkay, manyOkay, separator, true, tag, (Atom)separator.complement());
if (zeroOkay && separator != null)
throw new RuntimeException("cannot create a maximal repetition of zero or more items with a separator (yet): " + this);
}
public Maximal(final Atom e, boolean zeroOkay, boolean manyOkay, Object tag) {
super(e, zeroOkay, manyOkay, null, true, tag, (Atom)e.complement());
}
}
/** repeat zero or one times */
public static Element maybe(Element e) { return new Repeat(e, true, false, null, null); }
public static Element maybe(Element e, Object tag) { return new Repeat(e, true, false, null, tag); }
/** repeat zero or more times */
public static Element many0(Element e) { return new Repeat(e, true, true, null, null); }
public static Element many0(Element e, Object tag) { return new Repeat(e, true, true, null, tag); }
/** repeat zero or more times, separated by sep */
public static Element many0(Element e, Element sep) { return new Repeat(e, true, true, sep, null); }
public static Element many0(Element e, Element sep, Object tag) { return new Repeat(e, true, true, sep, tag); }
/** repeat one or more times */
public static Element many1(Element e) { return new Repeat(e, false, true, null, null); }
public static Element many1(Element e, Object tag) { return new Repeat(e, false, true, null, tag); }
/** repeat one or more times, separated by sep */
public static Element many1(Element e, Element sep) { return new Repeat(e, false, true, sep, null); }
public static Element many1(Element e, Element sep, Object tag) { return new Repeat(e, false, true, sep, tag); }
/** repeat zero or more times, matching a maximal sequence of atoms */
public static Element maximal0(Atom e) { return new Repeat.Maximal(e, true, true, null); }
public static Element maximal0(Atom e, Object tag) { return new Repeat.Maximal(e, true, true, tag); }
/** repeat one or more times, matching a maximal sequence of atoms */
public static Element maximal1(Atom e) { return new Repeat.Maximal(e, false, true, null); }
public static Element maximal1(Atom e, Object tag) { return new Repeat.Maximal(e, false, true, tag); }
/** repeat one or more times, separated by an atom sep, matching a maximal sequence */
public static Element maximal1(Element e, Atom sep) { return new Repeat.Maximal(e, false, true, sep, null); }
public static Element maximal1(Element e, Atom sep, Object tag) { return new Repeat.Maximal(e, false, true, sep, tag); }
public static Element repeatMaximal(Atom e, boolean zero, boolean many, Object tag) {
return new Repeat.Maximal(e, zero, many, tag); }
public static Element repeatMaximal(Element e, boolean zero, boolean many, Atom sep, Object tag) {
return new Repeat.Maximal(e, zero, many, sep, tag); }
public static Element repeat(Element e, boolean zero, boolean many, Object tag) {
return new Repeat(e, zero, many, tag); }
public static Element repeat(Element e, boolean zero, boolean many, Element sep, Object tag) {
return new Repeat(e, zero, many, sep, tag); }
}