/** an implementation of Token for streams of Java <tt>char</tt> values */
public class CharToken implements IntegerMappable {
- public static class CharRange extends Atom<CharToken> {
- private String esc(char c) { return StringUtil.escapify(c+"", "[]-~\\\"\'"); }
- private Topology<CharToken> t;
- public CharRange(Topology<CharToken> t) { this.t = t; }
- public Topology<CharToken> top() { return t; }
- public String toString() {
- StringBuffer sb = new StringBuffer();
- sb.append('[');
- Range.Set ranges = ((IntegerTopology)top()).getRanges();
- if (ranges.size() == -1 || ranges.size() > Character.MAX_VALUE/2) {
- sb.append('~');
- ranges = ranges.complement();
- }
- ranges = ranges.intersect(all);
- for(Range r : ranges) {
- if (r.isMinNegInf() || r.isMaxPosInf()) throw new Error("should not happen");
- if (r.getMin()==r.getMax()) {
- sb.append(esc((char)r.getMin()));
- } else{
- sb.append(esc((char)r.getMin()));
- sb.append('-');
- sb.append(esc((char)r.getMax()));
- }
- }
- sb.append(']');
- return sb.toString();
- }
- }
-
/** returns an element matching all characters between <tt>start</tt> and <tt>end</tt>, inclusive */
public static Atom positiveRange(char start, char end) {
return new CharRange(new IntegerTopology<CharToken>(new Range.Set(new Range((int)start, (int)end))));
public static final Atom rightBrace = new CharRange(new IntegerTopology<CharToken>(9999)) { public String toString() { return "}"; } };
public static final CharToken left = new CharToken((char)9998);
public static final CharToken right = new CharToken((char)9999);
-
- private static final Range.Set all = new Range.Set(new Range(0, Character.MAX_VALUE));
+
+ static final Range.Set all = new Range.Set(new Range(0, Character.MAX_VALUE));
public static final Atom any = new CharRange(new IntegerTopology<CharToken>(all));
public static final Atom none = new CharRange(new IntegerTopology<CharToken>());
public static IntegerTopology<CharToken> range(Range r) { return new IntegerTopology<CharToken>(r); }