/** an implementation of Token for streams of Java <tt>char</tt> values */
public class CharToken implements IntegerMappable {
- /** 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))));
- }
-
- /** returns an element matching all characters <b>not</b> between <tt>start</tt> and <tt>end</tt>, inclusive */
- public static Atom negativeRange(char start, char end) {
- return new CharRange(new IntegerTopology<CharToken>(new Range.Set(new Range((int)start, (int)end)).complement().intersect(all)));
- }
-
public static final Atom leftBrace = new CharRange(new IntegerTopology<CharToken>(9998)) { public String toString() { return "{"; } };
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 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); }
- public static Atom set(Range.Set r) { return new CharRange(new IntegerTopology<CharToken>(r)); }
-
- /** returns an element which exactly matches the string given */
- public static Element string(String s) {
- if (s.length() == 0) return Union.epsilon;
- final String escapified = "\""+StringUtil.escapify(s, "\"\r\n\\")+"\"";
- Element ret;
- if (s.length() == 1) {
- ret =
- new CharRange(new IntegerTopology<CharToken>((int)s.charAt(0))) {
- public String toString() { return escapified; } };
- } else {
- Union ret2 = new Union("\""+s+"\"_str", true) {
- public String toString() { return escapified; } };
- Element[] refs = new Element[s.length()];
- for(int i=0; i<refs.length; i++) refs[i] = new CharRange(new IntegerTopology<CharToken>((int)s.charAt(i)));
- ret2.add(Sequence.constant(refs, s, null, null));
- ret = ret2;
- }
- return ret;
- }
-
- /** FIXME */
- public static Topology<CharToken> top() { return new IntegerTopology<CharToken>(); }
- public static Topology<CharToken> top(String s) throws java.text.ParseException {
- return new IntegerTopology<CharToken>(Range.Set.parse(s));
- }
+ //public static Atom set(Range.Set r) { return new CharRange(new IntegerTopology<CharToken>(r)); }
// Private //////////////////////////////////////////////////////////////////////////////