1 package edu.berkeley.sbp.meta;
2 import edu.berkeley.sbp.util.*;
3 import edu.berkeley.sbp.*;
4 import edu.berkeley.sbp.chr.*;
5 import edu.berkeley.sbp.misc.*;
6 import edu.berkeley.sbp.bind.*;
8 import java.lang.annotation.*;
9 import java.lang.reflect.*;
12 /** The java classes typically used to represent a parsed grammar AST; each inner class is a type of AST node. */
13 public class MetaGrammarBindings {
15 // FIXME ugly ugly ugly scary dangerous
16 public static String prefix = "";
18 /** A grammar (a set of nonterminals) */
19 public static class GrammarNode extends HashMap<String,NonTerminalNode> implements NonTerminalSource {
20 public NonTerminalNode[] getNonTerminals() {
21 return (NonTerminalNode[])values().toArray(new NonTerminalNode[0]);
23 public GrammarNode(NonTerminalNode[] nonterminals) {
24 for(NonTerminalNode nt : nonterminals) {
25 if (nt==null) continue;
26 if (this.get(nt.name)!=null)
27 throw new RuntimeException("duplicate definition of nonterminal \""+nt.name+"\"");
28 this.put(nt.name, nt);
31 public @bind.as("Grammar") GrammarNode(Object[] nt) {
34 private void add(Object[] obs) {
36 if (o==null) continue;
37 else if (o instanceof Object[]) add((Object[])o);
38 else if (o instanceof NonTerminalNode) {
39 NonTerminalNode nt = (NonTerminalNode)o;
40 if (this.get(nt.name)!=null)
41 throw new RuntimeException("duplicate definition of nonterminal \""+nt.name+"\"");
42 this.put(nt.name, nt);
44 else if (o instanceof NonTerminalSource) add(((NonTerminalSource)o).getNonTerminals());
47 public String toString() {
49 for(NonTerminalNode nt : values()) ret += nt + ", ";
52 public Union build(String s, Grammar.Bindings rm) {
53 Context cx = new Context(this,rm);
55 for(MetaGrammarBindings.NonTerminalNode nt : values()) {
56 Union el = (Union)cx.get(nt.name);
57 StringBuffer st = new StringBuffer();
59 if (nt.name.equals(s)) u = el;
65 public abstract static class UnionNode extends ElementNode {
66 public Seq[][] sequences;
67 public void build(Context cx, Union u, NonTerminalNode cnt) {
68 HashSet<Sequence> bad2 = new HashSet<Sequence>();
69 for(int i=0; i<sequences.length; i++) {
70 Seq[] group = sequences[i];
71 Union u2 = new Union();
72 if (sequences.length==1) u2 = u;
73 for(int j=0; j<group.length; j++) {
74 group[j].build(cx, u2, false, cnt);
76 if (sequences.length==1) break;
77 Sequence seq = Sequence.singleton(u2);
78 for(Sequence s : bad2) {
83 bad2.add(Sequence.singleton(u2));
88 public static @bind.as("#import") GrammarNode poundimport(String fileName, String as) {
89 if (as==null) as = "";
90 else if ("".equals(as)) { }
93 System.err.println("#import " + fileName + " as " + as);
95 Tree t = new CharParser(MetaGrammar.newInstance()).parse(new FileInputStream("tests/"+fileName)).expand1();
96 Tree.TreeFunctor<Object,Object> red = (Tree.TreeFunctor<Object,Object>)t.head();
97 String oldprefix = prefix;
99 GrammarNode gn = (GrammarNode)red.invoke(t);
102 } catch (Exception e) {
104 throw new RuntimeException(e);
108 public static interface NonTerminalSource {
109 public NonTerminalNode[] getNonTerminals();
112 public static class NonTerminalNode extends UnionNode implements NonTerminalSource {
114 public String name = null;
115 public String sep = null;
116 public NonTerminalNode[] getNonTerminals() { return new NonTerminalNode[] { this }; }
117 public @bind.as("NonTerminal") NonTerminalNode(@bind.arg String name, @bind.arg Seq[][] sequences) { this(name, sequences, false); }
118 public NonTerminalNode(String name, Seq[][] sequences, boolean rep) { this(name, sequences, rep, null); }
119 public NonTerminalNode(String name, Seq[][] sequences, boolean rep, String sep) {
120 this.name = prefix + name;
121 this.sequences = sequences;
123 this.sep = prefix + sep;
125 public Element build(Context cx, NonTerminalNode cnt) { return cx.get(name); }
126 public void build(Context cx, Union u, NonTerminalNode cnt) {
127 if (!rep) { super.build(cx, u, this); return; }
128 HashSet<Sequence> bad2 = new HashSet<Sequence>();
130 Union urep = new Union();
131 urep.add(Sequence.empty);
132 urep.add(Sequence.singleton(new Element[] { cx.get(sep), u }, 1));
134 for(int i=0; i<sequences.length; i++) {
135 Seq[] group = sequences[i];
136 Union u2 = new Union();
137 if (sequences.length==1) u2 = u;
138 for(int j=0; j<group.length; j++) {
139 Union u3 = new Union();
140 group[j].build(cx, u3, false, this);
141 Sequence s = Sequence.unwrap(new Element[] { u3, urep },
143 new boolean[] { false, false });
146 if (sequences.length==1) break;
147 Sequence seq = Sequence.singleton(u2);
148 for(Sequence s : bad2) {
153 bad2.add(Sequence.singleton(u2));
158 public static @bind.as("=") NonTerminalNode go(@bind.arg String name, @bind.arg Seq[][] sequences) {
159 return new NonTerminalNode(name, sequences, true); }
160 public static @bind.as("=") NonTerminalNode go(@bind.arg String name, @bind.arg String sep, @bind.arg Seq[][] sequences) {
161 return new NonTerminalNode(name, sequences, true, sep); }
163 public static class AnonUnionNode extends UnionNode {
164 public @bind.as("(") AnonUnionNode(Seq[][] sequences) {
165 this.sequences = sequences;
167 public Element build(Context cx, NonTerminalNode cnt) {
168 Union ret = new Union();
174 public static class Range {
175 public @bind Range(char only) { first = only; last = only; }
176 public @bind Range(char first, char last) { this.first = first; this.last = last; }
181 public static /*abstract*/ class Seq {
182 HashSet<Seq> and = new HashSet<Seq>();
183 HashSet<Seq> not = new HashSet<Seq>();
184 ElementNode[] elements;
188 public void append(ElementNode e) {
189 ElementNode[] elements = new ElementNode[this.elements.length+1];
190 System.arraycopy(this.elements, 0, elements, 0, this.elements.length);
191 this.elements = elements;
192 elements[elements.length-1] = e;
194 public Seq(ElementNode e) { this(new ElementNode[] { e }); }
195 public Seq(ElementNode[] elements) { this.elements = elements; }
196 public Seq tag(String tag) { this.tag = prefix+tag; return this; }
197 public Seq follow(ElementNode follow) { this.follow = follow; return this; }
199 Seq ret = new Seq(elements);
203 ret.tag = prefix+tag;
206 public Seq and(Seq s) { and.add(s); s.lame = true; return this; }
207 public Seq andnot(Seq s) { not.add(s); s.lame = true; return this; }
208 public Seq separate(ElementNode sep) {
209 ElementNode[] elements = new ElementNode[this.elements.length * 2 - 1];
210 for(int i=0; i<this.elements.length; i++) {
211 elements[i*2] = this.elements[i];
212 if (i<this.elements.length-1)
213 elements[i*2+1] = new Drop(sep);
215 this.elements = elements;
218 public Sequence build(Context cx, Union u, boolean lame, NonTerminalNode cnt) {
219 Sequence ret = build0(cx, lame || this.lame, cnt);
220 for(Seq s : and) { Sequence dork = s.build(cx, u, true, cnt); ret = ret.and(dork); }
221 for(Seq s : not) { Sequence dork = s.build(cx, u, true, cnt); ret = ret.not(dork); }
226 public Sequence build0(Context cx, boolean lame, NonTerminalNode cnt) {
227 boolean dropAll = lame;
228 if (tag!=null && tag.endsWith("()")) dropAll = true;
229 boolean[] drops = new boolean[elements.length];
230 Element[] els = new Element[elements.length];
231 for(int i=0; i<elements.length; i++) {
232 drops[i] = elements[i].drop();
233 els[i] = elements[i].build(cx, cnt);
234 if (elements[i].getOwnerTag() != null)
235 tag = elements[i].getOwnerTag();
238 if (dropAll) ret = Sequence.drop(els, false);
240 Production prod = new Production(tag, (cnt==null?null:cnt.name), els, drops);
241 ret = cx.rm.tryResolveTag(prod);
244 for(int i=0; i<els.length; i++)
246 if (idx==-1) idx = i;
247 else throw new Error("multiple non-dropped elements in sequence: " + Sequence.drop(els,false));
248 if (idx != -1) ret = Sequence.singleton(els, idx);
249 else ret = Sequence.drop(els, false);
252 if (this.follow != null)
253 ret.follow = infer(this.follow.build(cx, null));
254 ret.lame = this.lame;
258 public static @bind.as("&") Seq and2(Seq s, Seq a) { return s.and(a); }
259 public static @bind.as("&~") Seq andnot2(Seq s, Seq a) { return s.andnot(a); }
260 public static @bind.as("->") Seq arrow(Seq s, ElementNode e) { return s.follow(e); }
261 public static @bind.as("::") Seq tag(String tagname, Seq s) { return s.tag(tagname); }
262 public static @bind.as("/") Seq slash(Seq s, ElementNode e) { return s.separate(e); }
264 public static Seq seq(ElementNode[] elements) { return new Seq(elements); }
265 public static @bind.as("Elements") Seq seq2(ElementNode[] elements) { return new Seq(elements); }
266 public static @bind.as Seq psx(Seq s) { return s; }
267 public static @bind.as(":") ElementNode colon(String s, ElementNode e) { return new Label(s, e); }
268 public static @bind.as(")") void close(String foo) { throw new Error("not supported"); }
269 public static @bind.as("()") ElementNode epsilon() { return new Constant(Union.epsilon); }
271 public static class NonTerminalReferenceNode extends ElementNode {
272 public String nonTerminal;
273 public NonTerminalReferenceNode() { }
274 public @bind.as("NonTerminalReference") NonTerminalReferenceNode(String nonTerminal) {
275 this.nonTerminal = prefix + nonTerminal;
277 public Element build(Context cx, NonTerminalNode cnt) {
278 if (!this.nonTerminal.startsWith(prefix)) nonTerminal = prefix + nonTerminal;
279 Element ret = cx.get(nonTerminal);
280 if (ret == null) throw new RuntimeException("unknown nonterminal \""+nonTerminal+"\"");
285 public static class Literal extends Constant {
286 public @bind Literal(@bind.arg String string) { super(CharRange.string(string)); }
287 public boolean drop() { return true; }
290 public static class CharClass extends ElementNode {
292 public @bind.as("[") CharClass(Range[] ranges) { this.ranges = ranges; }
293 public Element build(Context cx, NonTerminalNode cnt) {
294 edu.berkeley.sbp.util.Range.Set set = new edu.berkeley.sbp.util.Range.Set();
295 for(Range r : ranges)
296 set.add(r.first, r.last);
297 return CharRange.set(set);
301 public static @bind.as("{") class XTree extends ElementNode {
302 public @bind.arg Seq body;
303 public Element build(Context cx, NonTerminalNode cnt) {
304 Union u = new Union();
305 Sequence s = body.build(cx, u, false, null);
306 Union u2 = new Union();
307 u2.add(Sequence.singleton(new Element[] {
318 public static class Rep extends ElementNode {
319 public ElementNode e, sep;
320 public boolean zero, many, max;
321 public Rep(ElementNode e, ElementNode sep, boolean zero, boolean many, boolean max) {
322 this.e = e; this.sep = sep; this.zero = zero; this.many = many; this.max = max;}
323 public Element build(Context cx, NonTerminalNode cnt) {
325 ? Sequence.repeat(e.build(cx, null), zero, many, sep==null ? null : sep.build(cx, null), cx.rm.repeatTag())
327 ? Sequence.repeatMaximal(infer(e.build(cx, null)), zero, many, cx.rm.repeatTag())
328 : Sequence.repeatMaximal(e.build(cx, null), zero, many, infer(sep.build(cx, null)), cx.rm.repeatTag());
332 // FIXME: it would be nice if we could hoist this into "Rep"
333 public static @bind.as("++") ElementNode plusmax(final ElementNode e)
334 { return new Rep(e, null, false, true, true); }
335 public static @bind.as("+") ElementNode plus(final ElementNode e)
336 { return new Rep(e, null, false, true, false); }
337 public static @bind.as("++/") ElementNode plusmaxfollow(final ElementNode e, final ElementNode sep)
338 { return new Rep(e, sep, false, true, true); }
339 public static @bind.as("+/") ElementNode plusfollow(final ElementNode e, final ElementNode sep)
340 { return new Rep(e, sep, false, true, false); }
341 public static @bind.as("**") ElementNode starmax(final ElementNode e)
342 { return new Rep(e, null, true, true, true); }
343 public static @bind.as("*") ElementNode star(final ElementNode e)
344 { return new Rep(e, null, true, true, false); }
345 public static @bind.as("**/") ElementNode starmaxfollow(final ElementNode e, final ElementNode sep)
346 { return new Rep(e, sep, true, true, true); }
347 public static @bind.as("*/") ElementNode starfollow(final ElementNode e, final ElementNode sep)
348 { return new Rep(e, sep, true, true, false); }
349 public static @bind.as("?") ElementNode question(final ElementNode e)
350 { return new Rep(e, null, true, true, false); }
351 public static @bind.as("!") ElementNode bang(final ElementNode e)
352 { return new Drop(e); }
354 public static @bind.as("^") ElementNode caret(final String s) {
355 final String thePrefix = prefix;
356 return new Drop(new Constant(CharRange.string(s)) {
357 public String getOwnerTag() { return thePrefix+s; }
361 public static @bind.as("~") ElementNode tilde(final ElementNode e) {
362 return new PostProcess(e) {
363 public Element postProcess(Element e) {
364 return infer((Topology<Character>)Atom.toAtom(e).complement().minus(CharRange.braces));
367 public static @bind.as("Word") String word(String s) { return s; }
368 public static @bind.as("Quoted") String quoted(String s) { return s; }
369 public static @bind.as("escaped") String c(char c) { return c+""; }
370 public static @bind.as("EmptyString") String emptystring() { return ""; }
371 public static @bind.as("\n") String retur() { return "\n"; }
372 public static @bind.as("\r") String lf() { return "\r"; }
374 static Atom infer(Element e) { return infer((Topology<Character>)Atom.toAtom(e)); }
375 static Atom infer(Topology<Character> t) { return new CharRange(new CharTopology(t)); }
377 public static class Context {
378 public HashMap<String,Union> map = new HashMap<String,Union>();
379 public GrammarNode grammar;
380 public String cnt = null;
381 public Grammar.Bindings rm;
382 public Context(GrammarNode g, Grammar.Bindings rm) {
386 public Union build() {
388 for(NonTerminalNode nt : grammar.values()) {
389 Union u = get(nt.name);
390 if ("s".equals(nt.name))
395 public Context(Tree t, Grammar.Bindings rm) {
397 Tree.TreeFunctor<Object,Object> red = (Tree.TreeFunctor<Object,Object>)t.head();
398 this.grammar = (GrammarNode)red.invoke(t);
400 public Union peek(String name) { return map.get(name); }
401 public void put(String name, Union u) { map.put(name, u); }
402 public Union get(String name) {
403 Union ret = map.get(name);
404 if (ret != null) return ret;
405 ret = new Union(name);
407 NonTerminalNode nt = grammar.get(name);
409 //System.err.println("*** warning could not find " + name);
410 throw new Error("warning could not find " + name);
414 nt.build(this, ret, nt);
422 public static class Constant extends ElementNode {
424 public Constant(Element constant) { this.constant = constant; }
425 public Element build(Context cx, NonTerminalNode cnt) { return constant; }
427 public abstract static class PostProcess extends ElementNode {
429 public PostProcess(ElementNode e) { this.e = e; }
430 public Element build(Context cx, NonTerminalNode cnt) { return postProcess(e.build(cx, cnt)); }
431 public abstract Element postProcess(Element e);
433 public static abstract class ElementNode {
434 public String getLabel() { return null; }
435 public String getOwnerTag() { return null; }
436 public boolean drop() { return false; }
437 public abstract Element build(Context cx, NonTerminalNode cnt);
440 public static class Drop extends ElementNode {
441 public ElementNode e;
442 public Drop(ElementNode e) { this.e = e; }
443 public String getLabel() { return null; }
444 public boolean drop() { return true; }
445 public String getOwnerTag() { return e.getOwnerTag(); }
446 public Element build(Context cx, NonTerminalNode cnt) { return e.build(cx, cnt); }
449 public static class Label extends ElementNode {
451 public ElementNode e;
452 public Label(String label, ElementNode e) { this.e = e; this.label = label; }
453 public String getLabel() { return label; }
454 public String getOwnerTag() { return e.getOwnerTag(); }
455 public Element build(Context cx, NonTerminalNode cnt) { return e.build(cx, cnt); }