1 package edu.berkeley.sbp.chr;
4 import java.lang.reflect.*;
5 import java.lang.ref.*;
6 import edu.berkeley.sbp.*;
7 import edu.berkeley.sbp.util.*;
8 import edu.berkeley.sbp.misc.*;
9 import edu.berkeley.sbp.Input.Location;
11 public class CharRange extends Atom<Character> {
13 public CharRange(char a) { this(a,a); }
14 public CharRange(char a, char b) { this(new CharTopology(a, b)); }
15 public CharRange(CharTopology t) { this.t = t; }
17 private CharTopology t;
18 public Topology<Character> top() { return t; }
20 public static final char left = (char)9998;
21 public static final char right = (char)9999;
22 public static final Atom leftBrace = new CharRange(left,left) { public String toString() { return "[{]"; } };
23 public static final Atom rightBrace = new CharRange(right,right) { public String toString() { return "[}]"; } };
24 public static final Atom braces = new CharRange(left,right) { public String toString() { return "[{}]"; } };
26 public static Atom set(Range.Set r) { return new CharRange(new CharTopology(r)); }
28 public String toString() { return t.toString(); }
30 /** returns an element which exactly matches the string given */
31 public static Element string(String s) { return string(s, true); }
32 public static Element string(String s, boolean share) {
33 if (share && s.length() == 0) return Union.epsilon;
34 final String escapified = "\""+StringUtil.escapify(s, "\"\r\n\\")+"\"";
36 if (share && s.length() == 1) {
38 new CharRange(s.charAt(0)) {
39 public String toString() { return escapified; } };
41 Union ret2 = new Union("\""+s+"\"_str", true) {
42 public String toString() { return escapified; } };
43 Element[] refs = new Element[s.length()];
44 for(int i=0; i<refs.length; i++) refs[i] = new CharRange(s.charAt(i));
45 ret2.add(Sequence.constant(refs, s));