1 package edu.berkeley.sbp.misc;
4 import java.lang.reflect.*;
5 import java.lang.ref.*;
6 import edu.berkeley.sbp.*;
7 import edu.berkeley.sbp.Token.Location;
8 import edu.berkeley.sbp.util.*;
10 /** an implementation of Token for streams of Java <tt>char</tt> values */
11 public class CharToken implements IntegerMappable {
13 public static final Atom leftBrace = new CharRange(new IntegerTopology<CharToken>(9998)) { public String toString() { return "{"; } };
14 public static final Atom rightBrace = new CharRange(new IntegerTopology<CharToken>(9999)) { public String toString() { return "}"; } };
15 public static final CharToken left = new CharToken((char)9998);
16 public static final CharToken right = new CharToken((char)9999);
18 static final Range.Set all = new Range.Set(new Range(0, Character.MAX_VALUE));
19 public static final Atom any = new CharRange(new IntegerTopology<CharToken>(all));
20 public static final Atom none = new CharRange(new IntegerTopology<CharToken>());
21 public static IntegerTopology<CharToken> range(Range r) { return new IntegerTopology<CharToken>(r); }
22 //public static Atom set(Range.Set r) { return new CharRange(new IntegerTopology<CharToken>(r)); }
24 // Private //////////////////////////////////////////////////////////////////////////////
27 public CharToken(char c) { this.c = c; }
28 public String result() { return c+""; }
29 public String toString() { return "\'"+StringUtil.escapify(c+"")+"\'"; }
31 //////////////////////////////////////////////////////////////////////////////////////////
33 public int toInt() { return (int)c; }
35 public static class Stream extends CartesianInput<CharToken> {
36 private final Reader r;
38 public Stream(String s) { this(new StringReader(s)); }
39 public Stream(Reader r) { this(r, null); }
40 public Stream(Reader r, String s) { this.r = r; }
41 public Stream(InputStream i) { this(i, null); }
42 public Stream(InputStream i, String s) { this(new InputStreamReader(i), s); }
45 public boolean isCR() { return cr; }
46 public CharToken next() throws IOException {
49 if (i==-1) return null;
52 return new CharToken(c);