1 package edu.berkeley.sbp.misc;
2 import edu.berkeley.sbp.util.*;
3 import edu.berkeley.sbp.*;
4 import edu.berkeley.sbp.chr.*;
6 import java.lang.annotation.*;
7 import java.lang.reflect.*;
12 public static boolean harsh = false;
14 public static void main(String[] s) throws Exception {
16 ReflectiveMeta m = new ReflectiveMeta();
17 Tree<String> res = new CharParser(MetaGrammar.make()).parse(new FileInputStream(s[0])).expand1();
18 MetaGrammar.Meta.MetaGrammarFile mgf = m.new MetaGrammarFile(res);
19 MetaGrammar.BuildContext bc = new MetaGrammar.BuildContext(mgf);
21 Union meta = mgf.get("s").build(bc);
22 Tree t = new CharParser(meta).parse(new FileInputStream(s[1])).expand1();
24 Union u = Demo.make(t, "s");
27 System.err.println("== parsing with parsed grammar =================================================================================");
28 t = new CharParser((Union)u).parse(new FileInputStream(s[1])).expand1();
29 System.out.println(t.toPrettyString());
31 System.err.println("== parsing with parsed-parsed grammar ==========================================================================");
32 t = new CharParser(new Context(t, m).build()).parse(new FileInputStream(s[1])).expand1();
33 System.out.println(t.toPrettyString());
36 public static class ReflectiveMetaPlain extends ReflectiveMeta {
37 public Object repeatTag() { return null; }
38 public Sequence tryResolveTag(String tag, String nonTerminalName, Element[] els, Object[] labels, boolean[] drops) {
40 public Sequence resolveTag(String tag, String nonTerminalName, Element[] els, Object[] labels, boolean[] drops) {
41 return Sequence.rewritingSequence(tag, els, labels, drops);
45 public static class ReflectiveMeta extends MetaGrammar.Meta {
46 private final Class _cl;
47 private final Class[] _inner;
48 public ReflectiveMeta() {
57 MG.NonTerminalReference.class,
58 MG.StringLiteral.class,
63 public ReflectiveMeta(Class c, Class[] inner) {
67 private boolean match(Method m, String s) { return match(m.getAnnotation(bind.as.class), null, s); }
68 private boolean match(bind.as t, Class c, String s) {
69 if (t==null) return false;
70 if (t.value().equals(s)) return true;
71 if (c != null && t.equals("") && c.getSimpleName().equals(s)) return true;
75 private boolean match(nonterminal t, Class c, String s) {
76 if (t==null) return false;
77 if (t.value().equals(s)) return true;
78 if (c != null && t.equals("") && c.getSimpleName().equals(s)) return true;
82 private boolean match(Class c, String s, String nonTerminalName) {
83 if (match((bind.as)c.getAnnotation(bind.as.class), c, s)) return true;
84 //if (match((nonterminal)c.getAnnotation(bind.as.class), c, nonTerminalName)) return true;
87 public boolean match(Constructor con, String s, String nonTerminalName) {
88 Class c = con.getDeclaringClass();
89 if (match((bind.as)con.getAnnotation(bind.as.class), null, s)) return true;
90 //if (match((nonterminal)con.getAnnotation(bind.as.class), c, s)) return true;
93 public Object repeatTag() {
94 return new Tree.ArrayBuildingTreeFunctor<Object>();
96 public Sequence tryResolveTag(String tag, String nonTerminalName, Element[] els, Object[] labels, boolean[] drops) {
97 Production p = new Production(tag, nonTerminalName, els, labels, drops);
98 for(Method m : _cl.getMethods())
99 if (new TargetMethod(m).isCompatible(p))
100 return new TargetMethod(m).makeSequence(p);
101 for(Class c : _inner)
102 for(Constructor con : c.getConstructors())
103 if (new TargetConstructor(con).isCompatible(p))
104 return new TargetConstructor(con).makeSequence(p);
105 for(Class c : _inner)
106 if (new TargetClass(c).isCompatible(p))
107 return new TargetClass(c).makeSequence(p);
110 public Sequence resolveTag(String tag, String nonTerminalName, Element[] els, Object[] labels, boolean[] drops) {
111 Sequence ret = tryResolveTag(tag, nonTerminalName, els, labels, drops);
112 if (ret != null) return ret;
113 String message = "could not find a Java method/class/ctor matching tag \""+tag+
114 "\", nonterminal \""+nonTerminalName+"\" with " + els.length + " arguments";
116 throw new RuntimeException(message);
118 System.err.println(message);
119 return Sequence.rewritingSequence(tag, els, labels, drops);
125 public static class bind {
127 * Constructors, classes, and methods with this attribute will
128 * match every production of the nonterminal called "value()"
129 * that is arg-compatible. If value() is undefined, then the
130 * class/constructor/method name is used.
133 @Retention(RetentionPolicy.RUNTIME) public static @interface nonterminal { String value() default ""; }
136 @Retention(RetentionPolicy.RUNTIME) public static @interface raw { }
139 * Constructors, classes, and methods with this attribute will
140 * match every tree tagged with "value()" that is arg-compatible.
141 * If value() is undefined, then the class/constructor/method
145 @Retention(RetentionPolicy.RUNTIME) public static @interface as { String value() default ""; }
149 * If any parameter to a method or field in a class has a named
150 * arg-tag, that parameter/field matches the child of the tree
151 * which either has that label or else is a reference to a
152 * nonterminal with the corresponding name.
154 * The remaining non-named arg-tags match the remaining children
155 * of the tree in sequential order.
157 * If any arg-tagged parameters/fields remain, the match fails.
158 * If there were no arg-tagged parameters-fields, it is as if all
159 * of them were non-named and arg-tagged.
161 * A method/constructor is arg-compatible if all of its arguments
162 * are arg-compatible.
164 * A class is arg-compatible if all of its fields are
165 * arg-compatible, or if one of its constructors is arg-compatible.
168 @Retention(RetentionPolicy.RUNTIME) public static @interface arg { String value() default ""; }
171 public static class Production {
173 public String nonTerminal;
174 public Object[] labels;
175 public boolean[] drops;
176 public Element[] elements;
177 public int count = 0;
178 public Production(String tag, String nonTerminal, Element[] elements, Object[] labels, boolean[] drops) {
180 this.elements = elements;
181 this.nonTerminal = nonTerminal;
182 this.labels = labels;
184 for(int i=0; i<drops.length; i++)
190 public static abstract class Target {
191 public abstract int[] buildSequence(Production p);
192 private Reflection.Bindable _bindable;
193 public Target(Reflection.Bindable b) { this._bindable = b; }
195 public String getName() { return _bindable.getSimpleName(); }
196 public bind.as getBindAs() { return (bind.as)_bindable.getAnnotation(bind.as.class); }
197 //public nonterminal getNonTerminal() { return (nonterminal)_bindable.getAnnotation(bind.as.class); }
198 public String toString() { return _bindable.getSimpleName(); }
199 public Object plant(Object[] fields) { return _bindable.impose(fields); }
200 public boolean isRaw() { return _bindable.isAnnotationPresent(bind.raw.class); }
201 public Object invokeRaw(Iterable<Tree<Object>> t) { return _bindable.impose(new Object[] { t }); }
203 public boolean isCompatible(Production p) {
204 bind.as t = getBindAs();
206 (t.value().equals(p.tag) ||
207 (t.value().equals("") && getName().equals(p.tag))))
208 return buildSequence(p)!=null;
210 bind.as n = getBindAs();
212 (n.value().equals(p.nonTerminal) ||
213 (n.value().equals("") && getName().equals(p.nonTerminal))))
214 return buildSequence(p)!=null;
219 public int[] buildSequence(Production p, String[] names, bind.arg[] argtags) {
221 for(int i=0; i<argtags.length; i++)
222 if (argtags[i] != null)
225 // FIXME: can be smarter here
226 if (names.length==p.count) {
227 int[] ret = new int[p.count];
228 for(int i=0; i<p.count; i++) ret[i] = i;
230 } else if (argTagged==p.count) {
231 int[] ret = new int[argtags.length];
233 for(int i=0; i<argtags.length; i++)
234 ret[i] = argtags[i]==null ? -1 : (j++);
240 public Sequence makeSequence(Production p) {
241 return Sequence.rewritingSequence(new TargetReducer(p, buildSequence(p), "reducer-"+this),
242 p.elements, p.labels, p.drops);
245 public class TargetReducer implements Tree.TreeFunctor<Object,Object> {
246 private Production p;
249 public TargetReducer(Production p, int[] map, String name) {
254 public String toString() { return name; }
255 public Object invoke(Iterable<Tree<Object>> t) {
256 if (isRaw()) return invokeRaw(t);
257 ArrayList ret = new ArrayList();
259 if (tc.head() != null && tc.head() instanceof Functor)
260 ret.add(((Tree.TreeFunctor<Object,Object>)tc.head()).invoke(tc.children()));
261 else if (tc.numChildren() == 0)
264 System.err.println("FIXME: don't know what to do about " + tc);
268 System.err.println("input tree: " + t);
269 Object[] o = (Object[])ret.toArray(new Object[0]);
271 for(int i=0; i<map.length; i++) max = Math.max(map[i], max);
272 Object[] o2 = new Object[max+1];
273 for(int i=0; i<o.length; i++) o2[map[i]] = o[i];
276 public int[] buildSequence(Production p) {
277 Annotation[][] annotations = _bindable.getArgAnnotations();
278 String[] names = _bindable.getArgNames();
279 String name = _bindable.getSimpleName();
280 int len = annotations.length;
282 bind.arg[] argtags = new bind.arg[len];
283 for(int i=0; i<names.length; i++)
284 for(Annotation a : annotations[i+ofs])
285 if (a instanceof bind.arg)
286 argtags[i+ofs] = (bind.arg)a;
287 return Target.this.buildSequence(p, names, argtags);
292 public static class TargetClass extends Target {
293 public final Class _class;
294 public TargetClass(Class _class) { super(Reflection.Bindable.create(_class)); this._class = _class; }
295 public int[] buildSequence(Production p) {
296 Field[] f = _class.getDeclaredFields();
297 String[] names = new String[f.length];
298 bind.arg[] argtags = new bind.arg[f.length];
299 for(int i=0; i<f.length; i++) {
300 names[i] = f[i].getName();
301 argtags[i] = f[i].getAnnotation(bind.arg.class);
303 int[] ret = buildSequence(p, names, argtags);
304 if (ret!=null) return ret;
305 for(Constructor c : _class.getConstructors())
306 if (new TargetConstructor(c).buildSequence(p)!=null)
307 return new TargetConstructor(c).buildSequence(p);
312 public static class TargetConstructor extends Target {
313 public final Constructor _ctor;
314 public TargetConstructor(Constructor _ctor) { super(Reflection.Bindable.create(_ctor)); this._ctor = _ctor; }
315 public int[] buildSequence(Production p) {
316 Annotation[][] annotations = _ctor.getParameterAnnotations();
317 int len = annotations.length;
319 String name = _ctor.getDeclaringClass().getName();
321 if (name.indexOf('$') > name.lastIndexOf('.')) {
326 String[] names = new String[len];
327 bind.arg[] argtags = new bind.arg[len];
328 for(int i=0; i<names.length; i++)
329 for(Annotation a : annotations[i+ofs])
330 if (a instanceof bind.arg)
331 argtags[i+ofs] = (bind.arg)a;
332 return buildSequence(p, names, argtags);
335 public static class TargetMethod extends Target {
336 public final Method _method;
337 public TargetMethod(Method _method) { super(Reflection.Bindable.create(_method)); this._method = _method; }
338 public int[] buildSequence(Production p) {
339 Annotation[][] annotations = _method.getParameterAnnotations();
340 String[] names = new String[annotations.length];
341 bind.arg[] argtags = new bind.arg[annotations.length];
342 for(int i=0; i<names.length; i++)
343 for(Annotation a : annotations[i])
344 if (a instanceof bind.arg)
345 argtags[i] = (bind.arg)a;
346 int[] ret = buildSequence(p, names, argtags);
351 public static Union cached = null;
352 public static Union make() {
353 if (cached != null) return cached;
355 ReflectiveMeta m = new ReflectiveMeta();
356 Tree<String> res = new CharParser(MetaGrammar.make()).parse(new FileInputStream("tests/meta.g")).expand1();
357 MetaGrammar.Meta.MetaGrammarFile mgf = m.new MetaGrammarFile(res);
358 MetaGrammar.BuildContext bc = new MetaGrammar.BuildContext(mgf);
359 Union meta = mgf.get("s").build(bc);
360 Tree t = new CharParser(meta).parse(new FileInputStream("tests/meta.g")).expand1();
361 return cached = make(t, "s");
362 } catch (Exception e) {
363 throw new RuntimeException(e);
366 public static Union make(Tree t, String s) { return make(t, s, new ReflectiveMeta()); }
367 public static Union make(Tree t, String s, ReflectiveMeta rm) {
368 Tree.TreeFunctor<Object,Object> red = (Tree.TreeFunctor<Object,Object>)t.head();
369 MG.Grammar g = (MG.Grammar)red.invoke(t.children());
370 Context cx = new Context(g,rm);
372 for(MG.NonTerminal nt : g.nonterminals) {
373 System.out.println(nt.name);
374 Union el = (Union)cx.get(nt.name);
375 StringBuffer st = new StringBuffer();
377 System.err.println(st);
378 if (nt.name.equals(s)) u = el;
383 public static class MG {
384 public static @bind.as("grammar") class Grammar {
385 public NonTerminal get(String s) {
386 for(NonTerminal nt : nonterminals)
387 if (nt.name.equals(s))
391 public @bind.arg("NonTerminal") NonTerminal[] nonterminals;
392 public String toString() {
394 for(NonTerminal nt : nonterminals) ret += nt + ", ";
398 public abstract static class Un extends El {
399 public Seq[][] sequences;
400 public void build(Context cx, Union u) {
401 HashSet<Sequence> bad2 = new HashSet<Sequence>();
402 for(int i=0; i<sequences.length; i++) {
403 Seq[] group = sequences[i];
404 Union u2 = new Union();
405 if (sequences.length==1) u2 = u;
406 for(int j=0; j<group.length; j++) {
407 group[j].build(cx, u2, false);
409 if (sequences.length==1) break;
410 Sequence seq = Sequence.singleton(u2);
411 for(Sequence s : bad2) {
416 bad2.add(Sequence.singleton(u2));
420 public static class NonTerminal extends Un {
421 public String name = null;
422 public @bind.as("=") NonTerminal(@bind.arg("Word") String name,
423 @bind.arg("RHS") Seq[][] sequences) {
425 this.sequences = sequences;
427 public Element build(Context cx) { return cx.get(name); }
430 public static class AnonUn extends Un {
431 public @bind.as("(") AnonUn(Seq[][] sequences) {
432 this.sequences = sequences;
434 public Element build(Context cx) {
435 Union ret = new Union();
441 //public static @bind.as void range(char c) { }
442 public static class Range {
443 public @bind.as("range") Range(char only) { first = only; last = only; }
444 public @bind.as("-") Range(char first, char last) { this.first = first; this.last = last; }
448 public static abstract class El {
449 public String getLabel() { return null; }
450 public String getOwnerTag() { return null; }
451 public boolean drop() { return false; }
452 public abstract Element build(Context cx);
454 public static class Drop extends El {
456 public Drop(El e) { this.e = e; }
457 public String getLabel() { return null; }
458 public boolean drop() { return true; }
459 public String getOwnerTag() { return e.getOwnerTag(); }
460 public Element build(Context cx) { return e.build(cx); }
462 public static class Label extends El {
465 public Label(String label, El e) { this.e = e; this.label = label; }
466 public String getLabel() { return label; }
467 public String getOwnerTag() { return e.getOwnerTag(); }
468 public Element build(Context cx) { return e.build(cx); }
470 public static /*abstract*/ class Seq {
471 HashSet<Seq> and = new HashSet<Seq>();
472 HashSet<Seq> not = new HashSet<Seq>();
477 public Seq(El e) { this(new El[] { e }); }
478 public Seq(El[] elements) { this.elements = elements; }
479 public Seq tag(String tag) { this.tag = tag; return this; }
480 public Seq follow(El follow) { this.follow = follow; return this; }
482 Seq ret = new Seq(elements);
489 public Seq and(Seq s) { and.add(s); s.lame = true; return this; }
490 public Seq andnot(Seq s) { not.add(s); s.lame = true; return this; }
491 public Seq separate(El sep) {
492 El[] elements = new El[this.elements.length * 2 - 1];
493 for(int i=0; i<this.elements.length; i++) {
494 elements[i*2] = this.elements[i];
495 if (i<this.elements.length-1)
496 elements[i*2+1] = new Drop(sep);
498 this.elements = elements;
501 public Sequence build(Context cx, Union u, boolean lame) {
502 Sequence ret = build0(cx, lame || this.lame);
503 for(Seq s : and) { Sequence dork = s.build(cx, u, true); ret = ret.and(dork); }
504 for(Seq s : not) { Sequence dork = s.build(cx, u, true); ret = ret.not(dork); }
509 public Sequence build0(Context cx, boolean lame) {
510 boolean unwrap = false;
511 boolean dropAll = lame;
512 if (tag!=null && tag.equals("[]")) unwrap = true;
513 if (tag!=null && "()".equals(tag)) dropAll = true;
514 Object[] labels = new Object[elements.length];
515 boolean[] drops = new boolean[elements.length];
516 Element[] els = new Element[elements.length];
517 for(int i=0; i<elements.length; i++) {
518 labels[i] = elements[i].getLabel();
519 drops[i] = elements[i].drop();
520 els[i] = elements[i].build(cx);
521 if (elements[i].getOwnerTag() != null)
522 tag = elements[i].getOwnerTag();
525 if (dropAll) ret = Sequence.drop(els, false);
526 else if (unwrap) ret = Sequence.unwrap(els, cx.rm.repeatTag(), drops);
527 else if (tag!=null) {
528 ret = cx.rm.resolveTag(tag, cx.cnt, els, labels, drops);
531 for(int i=0; i<els.length; i++)
533 if (idx==-1) idx = i;
534 else throw new Error("multiple non-dropped elements in sequence: " + Sequence.drop(els,false));
535 if (idx != -1) ret = Sequence.singleton(els, idx);
536 else ret = Sequence.drop(els, false);
538 if (this.follow != null)
539 ret.follow = MetaGrammar.infer(this.follow.build(cx));
540 ret.lame = this.lame;
544 public static @bind.as("&") Seq and(Seq s, El[] elements) { return s.and(seq(elements)); }
545 public static @bind.as("&~") Seq andnot(Seq s, El[] elements) { return s.andnot(seq(elements)); }
546 public static @bind.as("->") Seq arrow(Seq s, El e) { return s.follow(e); }
547 public static @bind.as("::") Seq tag(String tagname, Seq s) { return s.tag(tagname); }
548 public static @bind.as("/") Seq slash(Seq s, El e) { return s.separate(e); }
550 public static @bind.as("ps") Seq seq(El[] elements) { return new Seq(elements); }
551 public static @bind.as Seq psx(Seq s) { return s; }
552 public static @bind.as(":") El colon(String s, El e) { return new Label(s, e); }
553 public static @bind.as(")") void close(String foo) { throw new Error("not supported"); }
554 public static @bind.as("()") El epsilon() { return new Constant(Union.epsilon); }
556 public static @bind.as("nonTerminal") class NonTerminalReference extends El {
557 public @bind.arg String nonTerminal;
558 public Element build(Context cx) {
559 return cx.get(nonTerminal);
563 public static class StringLiteral extends Constant {
564 public @bind.as("literal") StringLiteral(String string) { super(CharRange.string(string)); }
565 public boolean drop() { return true; }
568 public static class CharClass extends El {
570 public @bind.as("[") CharClass(Range[] ranges) { this.ranges = ranges; }
571 public Element build(Context cx) {
572 edu.berkeley.sbp.util.Range.Set set = new edu.berkeley.sbp.util.Range.Set();
573 for(Range r : ranges)
574 set.add(r.first, r.last);
575 return CharRange.set(set);
579 public static @bind.as("{") class XTree extends El {
580 public @bind.arg Seq body;
581 public Element build(Context cx) {
586 public static class Rep extends El {
588 public boolean zero, many, max;
589 public Rep(El e, El sep, boolean zero, boolean many, boolean max) {
590 this.e = e; this.sep = sep; this.zero = zero; this.many = many; this.max = max;}
591 public Element build(Context cx) {
593 ? Sequence.repeat(e.build(cx), zero, many, sep==null ? null : sep.build(cx), cx.rm.repeatTag())
595 ? Sequence.repeatMaximal(MetaGrammar.infer(e.build(cx)), zero, many, cx.rm.repeatTag())
596 : Sequence.repeatMaximal(e.build(cx), zero, many, MetaGrammar.infer(sep.build(cx)), cx.rm.repeatTag());
599 public static class Constant extends El {
601 public Constant(Element constant) { this.constant = constant; }
602 public Element build(Context cx) { return constant; }
604 public abstract static class PostProcess extends El {
606 public PostProcess(El e) { this.e = e; }
607 public Element build(Context cx) { return postProcess(e.build(cx)); }
608 public abstract Element postProcess(Element e);
611 // FIXME: it would be nice if we could hoist this into "Rep"
612 public static @bind.as("++") El plusmax(final El e) { return new Rep(e, null, false, true, true); }
613 public static @bind.as("+") El plus(final El e) { return new Rep(e, null, false, true, false); }
614 public static @bind.as("++/") El plusmaxfollow(final El e, final El sep) { return new Rep(e, sep, false, true, true); }
615 public static @bind.as("+/") El plusfollow(final El e, final El sep) { return new Rep(e, sep, false, true, false); }
616 public static @bind.as("**") El starmax(final El e) { return new Rep(e, null, true, true, true); }
617 public static @bind.as("*") El star(final El e) { return new Rep(e, null, true, true, false); }
618 public static @bind.as("**/") El starmaxfollow(final El e, final El sep) { return new Rep(e, sep, true, true, true); }
619 public static @bind.as("*/") El starfollow(final El e, final El sep) { return new Rep(e, sep, true, true, false); }
620 public static @bind.as("?") El question(final El e) { return new Rep(e, null, true, true, false); }
622 public static @bind.as("!") El bang(final El e) { return new Drop(e); }
624 public static @bind.as("^") El caret(final String s) {
625 return new Drop(new Constant(CharRange.string(s)) {
626 public String getOwnerTag() { return s; }
630 public static @bind.as("~") El tilde(final El e) {
631 return new PostProcess(e) {
632 public Element postProcess(Element e) {
633 return MetaGrammar.infer((Topology<Character>)Atom.toAtom(e).complement());
636 public static @bind.as("^^") void doublecaret(final El e) { throw new Error("not implemented"); }
638 //public static @bind.as("(") El subexpression(Seq[][] rhs) { return new NonTerminal(rhs); }
640 public static @bind.as("Word") String word(String s) { return s; }
641 public static @bind.as("Quoted") String quoted(String s) { return s; }
642 public static @bind.as("escaped") String c(char c) { return c+""; }
643 public static @bind.as("\"\"") String emptystring() { return ""; }
644 public static @bind.as("\n") String retur() { return "\n"; }
645 public static @bind.as("\r") String lf() { return "\r"; }
648 public static class Context {
649 HashMap<String,Union> map = new HashMap<String,Union>();
650 private MG.Grammar grammar;
651 public String cnt = null;
652 private ReflectiveMeta rm;
653 public Context(MG.Grammar g, ReflectiveMeta rm) {
657 public Union build() {
659 for(MG.NonTerminal nt : grammar.nonterminals) {
660 Union u = get(nt.name);
661 if ("s".equals(nt.name))
666 public Context(Tree t, ReflectiveMeta rm) {
668 Tree.TreeFunctor<Object,Object> red = (Tree.TreeFunctor<Object,Object>)t.head();
669 this.grammar = (MG.Grammar)red.invoke(t.children());
671 public Union peek(String name) { return map.get(name); }
672 public void put(String name, Union u) { map.put(name, u); }
673 public Union get(String name) {
674 Union ret = map.get(name);
675 if (ret != null) return ret;
676 ret = new Union(name);
678 MG.NonTerminal nt = grammar.get(name);
680 System.err.println("*** warning could not find " + name);