MG.Seq.class,
MG.NonTerminalReference.class,
MG.StringLiteral.class,
- MG.Epsilon.class,
MG.Tree.class,
MG.CharClass.class
});
public int count = 0;
public Production(String tag, String nonTerminal, Element[] elements, Object[] labels, boolean[] drops) {
this.tag = tag;
- this.elements = elements; // FIXME: use this
+ this.elements = elements;
this.nonTerminal = nonTerminal;
this.labels = labels;
this.drops = drops;
objects[i] = ((Reducer)tc.head()).reduce(tc);
else if (tc.numChildren() == 0)
objects[i] = tc.head();
- else if (t.numChildren()==1) {
- //FIXME: EVIL!!
- objects[i] = reduce(t.child(0));
- } else {
+ else {
System.err.println("FIXME: don't know what to do about " + tc);
objects[i] = null;
}
}
public static class MG {
- //public static @tag Grammar grammar(Grammar g) { return g; }
public static @tag("grammar") class Grammar {
public @arg("NonTerminal") NonTerminal[] nonterminals;
public String toString() {
public static @nonterminal class NonTerminal extends El {
public @arg("Word") String name;
public @arg("RHS") Seq[][] sequences;
+ private static int anon = 0;
+ public NonTerminal() { }
+ public NonTerminal(Seq[][] sequences) {
+ this.name = "anon" + (anon++);
+ this.sequences = sequences;
+ }
+ public Element build(Context cx) {
+ Element ret = cx.peek(name);
+ if (ret != null) return ret;
+ Union u = new Union(name);
+ cx.put(name, u);
+ HashSet<Sequence> bad = new HashSet<Sequence>();
+ for(Seq[] group : sequences) {
+ Union u2 = new Union(""+anon++);
+ HashSet<Sequence> bad2 = new HashSet<Sequence>();
+ for(Seq seq : group) {
+ Sequence built = seq.build(cx);
+ for(Sequence s : bad)
+ built = built.not(s);
+ u2.add(built);
+ bad2.add(built);
+ }
+ bad.addAll(bad2);
+ u.add(Sequence.singleton(u2));
+ }
+ return u;
+ }
}
public static @tag void range(char c) { }
- public static class Range extends El {
+ public static class Range {
public @tag("range") Range(char only) { first = only; last = only; }
public @tag("-") Range(char first, char last) { this.first = first; this.last = last; }
public char first;
public char last;
}
- public static class El { }
- public static /*abstract*/ @nonterminal("Sequence") class Seq extends El { }
- public static @tag("&") Seq and(Sequence s, El[] elements) { return new Seq(); }
- public static @tag("&~") Seq andnot(Sequence s, El[] elements) { return new Seq(); }
- public static @tag Seq ps(El[] elements) { return new Seq(); }
- public static @tag Seq psx(Seq s) { return s; }
- public static @tag("::") Seq tag(String tagname, Seq seq) { return new Seq(); }
- public static @tag(":") void colon(String s, El e) { }
- public static @tag(")") void close(String foo) { }
- public static @tag("/") Seq slash(Seq s, El e) { return new Seq(); }
- public static @tag("->") Seq arrow(Seq s, El e) { return new Seq(); }
-
- public static @tag("nonTerminal") class NonTerminalReference extends El { public @arg String nonTerminal; }
- public static @tag("literal") class StringLiteral extends El { public @arg String string; }
- public static @tag("()") class Epsilon extends El { }
- public static @tag("{") class Tree extends El { public @arg Seq body; }
- public static class CharClass extends El { public @tag("[") CharClass(Range[] ranges) { } }
-
- public static @tag("++") void plusmax(El e) { }
- public static @tag("+") void plus(El e) { }
- public static @tag("++/") void plusmaxfollow(El e, El sep) { }
- public static @tag("+/") void plusfollow(El e, El sep) { }
- public static @tag("**") void starmax(El e) { }
- public static @tag("*") void star(El e) { }
- public static @tag("**/") void starmaxfollow(El e, El sep) { }
- public static @tag("*/") void starfollow(El e, El sep) { }
- public static @tag("!") void bang(El e) { }
- public static @tag("?") void question(El e) { }
- public static @tag("^") void caret(String s) { }
- public static @tag("~") void tilde(El e) { }
- public static @tag("^^") void doublecaret(El e) { }
- public static @tag("(") void subexpression(Seq[][] rhs) { }
-
- public static @nonterminal("Word") String word(String s) { return null; }
- public static @nonterminal("Quoted") String quoted(String s) { return null; }
+ public static abstract class El {
+ public String getLabel() { return null; }
+ public String getOwnerTag() { return null; }
+ public boolean drop() { return false; }
+ public abstract Element build(Context cx);
+ }
+ public static class Drop extends El {
+ public El e;
+ public Drop(El e) { this.e = e; }
+ public String getLabel() { return null; }
+ public boolean drop() { return true; }
+ public Element build(Context cx) { return e.build(cx); }
+ }
+ public static class Label extends El {
+ public String label;
+ public El e;
+ public Label(String label, El e) { this.e = e; this.label = label; }
+ public String getLabel() { return label; }
+ public Element build(Context cx) { return e.build(cx); }
+ }
+ public static /*abstract*/ class Seq {
+ HashSet<Seq> and = new HashSet<Seq>();
+ HashSet<Seq> not = new HashSet<Seq>();
+ El[] elements;
+ El follow;
+ String tag = null;
+ public Seq(El e) { this(new El[] { e }); }
+ public Seq(El[] elements) { this.elements = elements; }
+ public Seq tag(String tag) { this.tag = tag; return this; }
+ public Seq follow(El follow) { this.follow = follow; return this; }
+ public Seq dup() {
+ Seq ret = new Seq(elements);
+ ret.and.addAll(and);
+ ret.not.addAll(not);
+ ret.follow = follow;
+ ret.tag = tag;
+ return ret;
+ }
+ public Seq and(Seq s) { and.add(s); return this; }
+ public Seq andnot(Seq s) { not.add(s); return this; }
+ public Seq separate(El sep) {
+ El[] elements = new El[this.elements.length * 2 - 1];
+ for(int i=0; i<this.elements.length; i++) {
+ elements[i*2] = this.elements[i];
+ if (i<this.elements.length-1)
+ elements[i*2+1] = new Drop(sep);
+ }
+ this.elements = elements;
+ return this;
+ }
+ public Sequence build(Context cx) {
+ boolean unwrap = false;
+ boolean dropAll = false;
+ if (tag!=null && tag.equals("[]")) unwrap = true;
+ if (tag!=null && "()".equals(tag)) dropAll = true;
+ Object[] labels = new Object[elements.length];
+ boolean[] drops = new boolean[elements.length];
+ Element[] els = new Element[elements.length];
+ for(int i=0; i<elements.length; i++) {
+ labels[i] = elements[i].getLabel();
+ drops[i] = elements[i].drop();
+ els[i] = elements[i].build(cx);
+ if (elements[i].getOwnerTag() != null)
+ tag = elements[i].getOwnerTag();
+ }
+ Sequence ret = null;
+ if (dropAll) ret = Sequence.drop(els, false);
+ else if (unwrap) ret = Sequence.unwrap(els, repeatTag(), drops);
+ else if (tag!=null) {
+ //FIXME
+ //ret = resolveTag(tag, bc.currentNonTerminal==null ? null : bc.currentNonTerminal.name, els, labels, drops);
+ //System.err.println("resolvetag " + tag + " => " + ret);
+ ret = Sequence.rewritingSequence(tag, els, labels, drops);
+ } else {
+ int idx = -1;
+ for(int i=0; i<els.length; i++)
+ if (!drops[i])
+ if (idx==-1) idx = i;
+ else throw new Error("multiple non-dropped elements in sequence: " + Sequence.drop(els,false));
+ if (idx != -1) ret = Sequence.singleton(els, idx);
+ else ret = Sequence.drop(els, false);
+ }
+ if (this.follow != null)
+ ret.follow = MetaGrammar.infer(this.follow.build(cx));
+ return ret;
+ }
+ }
+ public static @tag("&") Seq and(Seq s, El[] elements) { return s.and(seq(elements)); }
+ public static @tag("&~") Seq andnot(Seq s, El[] elements) { return s.andnot(seq(elements)); }
+ public static @tag("->") Seq arrow(Seq s, El e) { return s.follow(e); }
+ public static @tag("::") Seq tag(String tagname, Seq s) { return s.tag(tagname); }
+ public static @tag("/") Seq slash(Seq s, El e) { return s.separate(e); }
+
+ public static @tag("ps") Seq seq(El[] elements) { return new Seq(elements); }
+ public static @tag Seq psx(Seq s) { return s; }
+ public static @tag(":") El colon(String s, El e) { return new Label(s, e); }
+ public static @tag(")") void close(String foo) { throw new Error("not supported"); }
+ public static @tag("()") El epsilon() { return new Constant(Union.epsilon); }
+
+ public static @tag("nonTerminal") class NonTerminalReference extends El {
+ public @arg String nonTerminal;
+ public Element build(Context cx) { return cx.get(nonTerminal); }
+ }
+ public static class StringLiteral extends Constant {
+ public @tag("literal") StringLiteral(String string) { super(CharRange.string(string)); }
+ }
+ public static class CharClass extends El {
+ Range[] ranges;
+ public @tag("[") CharClass(Range[] ranges) { this.ranges = ranges; }
+ public Element build(Context cx) {
+ edu.berkeley.sbp.util.Range.Set set = new edu.berkeley.sbp.util.Range.Set();
+ for(Range r : ranges) set.add(r.first, r.last);
+ return CharRange.set(set);
+ }
+ }
+
+ public static @tag("{") class Tree extends El {
+ public @arg Seq body;
+ public Element build(Context cx) {
+ throw new Error();
+ }
+ }
+
+ public static class Rep extends El {
+ public El e, sep;
+ public boolean zero, many, max;
+ public Rep(El e, El sep, boolean zero, boolean many, boolean max) {
+ this.e = e; this.sep = sep; this.zero = zero; this.many = many; this.max = max;}
+ public Element build(Context cx) {
+ return max
+ ? Sequence.repeat(e.build(cx), zero, many, sep==null ? null : sep.build(cx), repeatTag())
+ : sep==null
+ ? Sequence.repeatMaximal(MetaGrammar.infer(e.build(cx)), zero, many, repeatTag())
+ : Sequence.repeatMaximal(e.build(cx), zero, many, MetaGrammar.infer(sep.build(cx)), repeatTag());
+ }
+ }
+ public static class Constant extends El {
+ Element constant;
+ public Constant(Element constant) { this.constant = constant; }
+ public Element build(Context cx) { return constant; }
+ }
+ public abstract static class PostProcess extends El {
+ El e;
+ public PostProcess(El e) { this.e = e; }
+ public Element build(Context cx) { return postProcess(e.build(cx)); }
+ public abstract Element postProcess(Element e);
+ }
+
+ // FIXME: it would be nice if we could hoist this into "Rep"
+ public static @tag("++") El plusmax(final El e) { return new Rep(e, null, false, true, true); }
+ public static @tag("+") El plus(final El e) { return new Rep(e, null, false, true, false); }
+ public static @tag("++/") El plusmaxfollow(final El e, final El sep) { return new Rep(e, sep, false, true, true); }
+ public static @tag("+/") El plusfollow(final El e, final El sep) { return new Rep(e, sep, false, true, false); }
+ public static @tag("**") El starmax(final El e) { return new Rep(e, null, true, true, true); }
+ public static @tag("*") El star(final El e) { return new Rep(e, null, true, true, false); }
+ public static @tag("**/") El starmaxfollow(final El e, final El sep) { return new Rep(e, sep, true, true, true); }
+ public static @tag("*/") El starfollow(final El e, final El sep) { return new Rep(e, sep, true, true, false); }
+ public static @tag("?") El question(final El e) { return new Rep(e, null, true, true, false); }
+
+ public static @tag("!") El bang(final El e) { return new Drop(e); }
+
+ public static @tag("^") El caret(final String s) {
+ return new Constant(CharRange.string(s)) {
+ public String getOwnerTag() { return s; }
+ };
+ }
+
+ public static @tag("~") El tilde(final El e) {
+ return new PostProcess(e) {
+ public Element postProcess(Element e) {
+ return MetaGrammar.infer((Topology<Character>)Atom.toAtom(e).complement());
+ } }; }
+
+ public static @tag("^^") void doublecaret(final El e) { throw new Error("not implemented"); }
+
+ public static @tag("(") El subexpression(Seq[][] rhs) { return new NonTerminal(rhs); }
+
+ public static @nonterminal("Word") String word(String s) { return s; }
+ public static @nonterminal("Quoted") String quoted(String s) { return s; }
public static @nonterminal("escaped") String c(char c) { return c+""; }
public static @tag("\"\"") String emptystring() { return ""; }
public static @tag("\n") String retur() { return "\n"; }
public static @tag("\r") String lf() { return "\r"; }
+
}
+ public static class Context {
+ HashMap<String,Union> map = new HashMap<String,Union>();
+ public Union peek(String name) { return map.get(name); }
+ public void put(String name, Union u) { map.put(name, u); }
+ public Union get(String name) {
+ Union ret = map.get(name);
+ if (ret==null) map.put(name, ret = new Union(name));
+ return ret;
+ }
+ }
+ public static Object repeatTag() { return null; }
}
projects / sbp.git / commitdiff