- public abstract class MetaClause {
- public String label = null;
- public boolean drop = false;
- public boolean lift = false;
- public abstract Element build(BuildContext bc);
- }
- public class MetaRepeat extends MetaClause {
- public MetaClause element, separator;
- public boolean maximal, zero, many;
- public Element build(BuildContext bc) {
- return !maximal
- ? (separator==null
- ? Sequence.repeat(element.build(bc), zero, many, null, null)
- : Sequence.repeat(element.build(bc), zero, many, separator.build(bc), null))
- : (separator==null
- ? Sequence.repeatMaximal(infer(element.build(bc)), zero, many, null)
- : Sequence.repeatMaximal(element.build(bc), zero, many, infer(separator.build(bc)), null));
- }
- public MetaRepeat(MetaClause element, boolean maximal, MetaClause separator, boolean zero, boolean many) {
- this.separator = separator;
- this.element = element;
- this.maximal = maximal;
- this.zero = zero;
- this.many = many;
- }
- public String toString() {
- return element+
- ((zero&&!many)?"?":zero?"*":"+")+
- (!maximal?"":zero?"*":"+")+
- (separator==null?"":(" /"+separator));
- }
- }
- public class Epsilon extends MetaClause {
- public String toString() { return "()"; }
- public Element build(BuildContext bc) { return Union.epsilon; }
- }
- public class Parens extends MetaClause {
- public MetaUnion body;
- public Parens(Tree<String> t) { this.body = rhs(t); }
- public String toString() { return "( " + body + " )"; }
- public Element build(BuildContext bc) { return body.buildAnon(bc); }
- }
- /*
- public static class MetaTree extends MetaClause {
- public Conjunct body;
- public MetaTree(Tree<String> t) { this.body = makeConjunct(t); }
- public String toString() { return "{ " + body + " }"; }
- public Element build(BuildContext bc) {
- return new Union("{}");// body.buildSequence();
- }
- }
- */
- public class MetaRange extends MetaClause {
- Range.Set range = new Range.Set();
- public String toString() { return range.toString(); }
- public Element build(BuildContext bc) { return set(range); }
- public MetaRange(Tree<String> t) {
- for(Tree<String> tt : t) {
- if (tt.head().equals("range")) {
- range.add(tt.child(0).head().charAt(0));
- } else if (tt.head().equals("-")) {
- range.add(new Range(string(tt.child(0)).charAt(0),
- string(tt.child(1)).charAt(0)));
- }
- }
- }
- }
- public class StringLiteral extends MetaClause {
- public String literal;
- public Element build(BuildContext bc) { return string(literal); }
- public StringLiteral(Tree<String> literal) { this.literal = string(literal); this.drop = true; }
- public String toString() { return "\""+StringUtil.escapify(literal, "\"\r\n\\")+"\""; }
- }
- public class NonTerminalReference extends MetaClause {
- public String name;
- public NonTerminalReference(Tree<String> name) { this.name = string(name); }
- public Element build(BuildContext bc) { return bc.build(name); }
- public String toString() { return name; }
- }
- public class SelfReference extends MetaClause {
- public String toString() { return "(*)"; }
- public Element build(BuildContext bc) { return new Union("(*)"); /* FIXME */ }
- }
- public class MetaInvert extends MetaClause {
- public MetaClause element;
- public MetaInvert(Tree<String> t, Conjunct c) { this.element = makeMetaClause(t, c); }
- public String toString() { return "~"+element; }
- public Element build(BuildContext bc) { return infer((Topology<Character>)Atom.toAtom(element.build(bc)).complement()); }