+// Copyright 2006-2007 all rights reserved; see LICENSE file for BSD-style license
+
package edu.berkeley.sbp.chr;
import java.io.*;
import java.util.*;
public class CharAtom extends Atom<Character> {
- public StringBuffer toString(StringBuffer sb) { sb.append(this); return sb; }
-
public CharAtom() { this(new CharTopology()); }
public CharAtom(char a) { this(a,a); }
public CharAtom(char a, char b) { this(new CharTopology(a, b)); }
public static final char left = (char)9998;
public static final char right = (char)9999;
- public static final Atom leftBrace = new CharAtom(left,left) { public String toString() { return "[{]"; } };
- public static final Atom rightBrace = new CharAtom(right,right) { public String toString() { return "[}]"; } };
- public static final Atom braces = new CharAtom(left,right) { public String toString() { return "[{}]"; } };
+ public static final Atom leftBrace = new CharAtom(left,left) { public String toString() { return ">>"; } };
+ public static final Atom rightBrace = new CharAtom(right,right) { public String toString() { return "<<"; } };
+ //public static final Atom braces = new CharAtom(left,right) { public String toString() { return "[\\{\\}]"; } };
public static Atom set(Range.Set r) { return new CharAtom(new CharTopology(r)); }
public String toString() { return t.toString(); }
/** returns an element which exactly matches the string given */
public static Element string(String s) { return string(s, true); }
public static Element string(String s, boolean share) {
- if (share && s.length() == 0) return epsilon;
+ if (share && s.length() == 0) return emptyString;
final String escapified = "\""+StringUtil.escapify(s, "\"\r\n\\")+"\"";
Element ret;
if (share && s.length() == 1) {
public String toString() { return escapified; } };
Element[] refs = new Element[s.length()];
for(int i=0; i<refs.length; i++) refs[i] = new CharAtom(s.charAt(i));
- ret2.add(Sequence.constant(refs, s));
+ ret2.add(Sequence.create(s, refs));
ret = ret2;
}
return ret;
}
- private static Union epsilon = new Union("()");
- static { epsilon.add(Sequence.empty); }
+ private static Union emptyString = new Union("()");
+ static {
+ // FIXME: force this to be dropped wherever used!
+ emptyString.add(Sequence.create("", new Element[0]));
+ }
public Topology<Atom<Character>> unwrap() { return this; }
public Topology<Atom<Character>> empty() { return new CharAtom(); }