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 extends AnnotationGrammarBindings {
15 public MetaGrammarBindings() { super(MetaGrammarBindings.class); }
17 // FIXME ugly ugly ugly scary dangerous
18 public static String prefix = "";
20 /** A grammar (a set of nonterminals) */
21 public static class GrammarNode extends HashMap<String,NonTerminalNode> {
22 public NonTerminalNode[] getNonTerminals() {
23 return (NonTerminalNode[])values().toArray(new NonTerminalNode[0]);
25 public GrammarNode(NonTerminalNode[] nonterminals) {
26 for(NonTerminalNode nt : nonterminals) {
27 if (nt==null) continue;
28 if (this.get(nt.name)!=null)
29 throw new RuntimeException("duplicate definition of nonterminal \""+nt.name+"\"");
30 this.put(nt.name, nt);
33 public @bind.as("Grammar") GrammarNode(Object[] nt) { add(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 GrammarNode) add(((GrammarNode)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)) { }
94 Tree t = new CharParser(MetaGrammar.newInstance()).parse(new FileInputStream("tests/"+fileName)).expand1();
95 Tree.TreeFunctor<Object,Object> red = (Tree.TreeFunctor<Object,Object>)t.head();
96 String oldprefix = prefix;
98 GrammarNode gn = (GrammarNode)red.invoke(t);
101 } catch (Exception e) {
103 throw new RuntimeException(e);
107 public static class NonTerminalNode extends UnionNode {
109 public String name = null;
110 public String sep = null;
111 public NonTerminalNode[] getNonTerminals() { return new NonTerminalNode[] { this }; }
112 public @bind.as("NonTerminal") NonTerminalNode(@bind.arg String name, @bind.arg Seq[][] sequences) {
113 this(name, sequences, false); }
114 public NonTerminalNode(String name, Seq[][] sequences, boolean rep) { this(name, sequences, rep, null); }
115 public NonTerminalNode(String name, Seq[][] sequences, boolean rep, String sep) {
116 this.name = prefix + name;
117 this.sequences = sequences;
119 this.sep = sep==null?null:(prefix + sep);
121 public Element build(Context cx, NonTerminalNode cnt) { return cx.get(name); }
122 public void build(Context cx, Union u, NonTerminalNode cnt) {
123 if (!rep) { super.build(cx, u, this); return; }
124 HashSet<Sequence> bad2 = new HashSet<Sequence>();
126 Union urep = new Union();
127 urep.add(Sequence.empty);
129 urep.add(Sequence.singleton(new Element[] { cx.get(sep), u }, 1));
131 urep.add(Sequence.singleton(new Element[] { u }, 0));
133 for(int i=0; i<sequences.length; i++) {
134 Seq[] group = sequences[i];
135 Union u2 = new Union();
136 if (sequences.length==1) u2 = u;
137 for(int j=0; j<group.length; j++) {
138 Union u3 = new Union();
139 group[j].build(cx, u3, false, this);
140 Sequence s = Sequence.unwrap(new Element[] { u3, urep },
142 new boolean[] { false, false });
145 if (sequences.length==1) break;
146 Sequence seq = Sequence.singleton(u2);
147 for(Sequence s : bad2) {
152 bad2.add(Sequence.singleton(u2));
157 public static @bind.as("=") NonTerminalNode go(@bind.arg String name, @bind.arg Seq[][] sequences) {
158 return new NonTerminalNode(name, sequences, true); }
159 public static @bind.as("=") NonTerminalNode go(@bind.arg String name, @bind.arg String sep, @bind.arg Seq[][] sequences) {
160 return new NonTerminalNode(name, sequences, true, sep); }
162 public static class AnonUnionNode extends UnionNode {
163 public @bind.as("(") AnonUnionNode(Seq[][] sequences) {
164 this.sequences = sequences;
166 public Element build(Context cx, NonTerminalNode cnt) {
167 Union ret = new Union();
173 public static class Range {
174 public @bind Range(char only) { first = only; last = only; }
175 public @bind Range(char first, char last) { this.first = first; this.last = last; }
180 public static /*abstract*/ class Seq {
181 HashSet<Seq> and = new HashSet<Seq>();
182 HashSet<Seq> not = new HashSet<Seq>();
183 ElementNode[] elements;
187 public void append(ElementNode e) {
188 ElementNode[] elements = new ElementNode[this.elements.length+1];
189 System.arraycopy(this.elements, 0, elements, 0, this.elements.length);
190 this.elements = elements;
191 elements[elements.length-1] = e;
193 public Seq(ElementNode e) { this(new ElementNode[] { e }); }
194 public Seq(ElementNode[] elements) { this.elements = elements; }
195 public Seq tag(String tag) { this.tag = prefix+tag; return this; }
196 public Seq follow(ElementNode follow) { this.follow = follow; return this; }
198 Seq ret = new Seq(elements);
202 ret.tag = prefix+tag;
205 public Seq and(Seq s) { and.add(s); s.lame = true; return this; }
206 public Seq andnot(Seq s) { not.add(s); s.lame = true; return this; }
207 public Seq separate(ElementNode sep) {
208 ElementNode[] elements = new ElementNode[this.elements.length * 2 - 1];
209 for(int i=0; i<this.elements.length; i++) {
210 elements[i*2] = this.elements[i];
211 if (i<this.elements.length-1)
212 elements[i*2+1] = new Drop(sep);
214 this.elements = elements;
217 public Sequence build(Context cx, Union u, boolean lame, NonTerminalNode cnt) {
218 Sequence ret = build0(cx, lame || this.lame, cnt);
219 for(Seq s : and) { Sequence dork = s.build(cx, u, true, cnt); ret = ret.and(dork); }
220 for(Seq s : not) { Sequence dork = s.build(cx, u, true, cnt); ret = ret.not(dork); }
225 public Sequence build0(Context cx, boolean lame, NonTerminalNode cnt) {
226 boolean dropAll = lame;
227 if (tag!=null && tag.endsWith("()")) dropAll = true;
228 boolean[] drops = new boolean[elements.length];
229 Element[] els = new Element[elements.length];
230 for(int i=0; i<elements.length; i++) {
231 drops[i] = elements[i].drop();
232 els[i] = elements[i].build(cx, cnt);
233 if (elements[i].getOwnerTag() != null)
234 tag = elements[i].getOwnerTag();
237 if (dropAll) ret = Sequence.drop(els, false);
239 Production prod = new Production(tag, (cnt==null?null:cnt.name), els, drops);
240 ret = cx.rm.createSequence(prod);
243 for(int i=0; i<els.length; i++)
245 if (idx==-1) idx = i;
246 else throw new Error("multiple non-dropped elements in sequence: " + Sequence.drop(els,false));
247 if (idx != -1) ret = Sequence.singleton(els, idx);
248 else ret = Sequence.drop(els, false);
251 if (this.follow != null)
252 ret.follow = infer(this.follow.build(cx, null));
253 ret.lame = this.lame;
257 public static @bind.as("&") Seq and2(Seq s, Seq a) { return s.and(a); }
258 public static @bind.as("&~") Seq andnot2(Seq s, Seq a) { return s.andnot(a); }
259 public static @bind.as("->") Seq arrow(Seq s, ElementNode e) { return s.follow(e); }
260 public static @bind.as("::") Seq tag(String tagname, Seq s) { return s.tag(tagname); }
261 public static @bind.as("/") Seq slash(Seq s, ElementNode e) { return s.separate(e); }
263 public static Seq seq(ElementNode[] elements) { return new Seq(elements); }
264 public static @bind.as("Elements") Seq seq2(ElementNode[] elements) { return new Seq(elements); }
265 public static @bind.as Seq psx(Seq s) { return s; }
266 public static @bind.as(":") ElementNode colon(String s, ElementNode e) { return new Label(s, e); }
267 public static @bind.as(")") void close(String foo) { throw new Error("not supported"); }
268 public static @bind.as("()") ElementNode epsilon() { return new Constant(Union.epsilon); }
270 public static class NonTerminalReferenceNode extends ElementNode {
271 public String nonTerminal;
272 public NonTerminalReferenceNode() { }
273 public @bind.as("NonTerminalReference") NonTerminalReferenceNode(String nonTerminal) {
274 this.nonTerminal = prefix + nonTerminal;
276 public Element build(Context cx, NonTerminalNode cnt) {
277 if (!this.nonTerminal.startsWith(prefix)) nonTerminal = prefix + nonTerminal;
278 Element ret = cx.get(nonTerminal);
279 if (ret == null) throw new RuntimeException("unknown nonterminal \""+nonTerminal+"\"");
284 public static class Literal extends Constant {
285 public @bind Literal(@bind.arg String string) { super(CharRange.string(string)); }
286 public boolean drop() { return true; }
289 public static class CharClass extends ElementNode {
291 public @bind.as("[") CharClass(Range[] ranges) { this.ranges = ranges; }
292 public Element build(Context cx, NonTerminalNode cnt) {
293 edu.berkeley.sbp.util.Range.Set set = new edu.berkeley.sbp.util.Range.Set();
294 for(Range r : ranges)
295 set.add(r.first, r.last);
296 return CharRange.set(set);
300 public static @bind.as("{") class XTree extends ElementNode {
301 public @bind.arg Seq body;
302 public Element build(Context cx, NonTerminalNode cnt) {
303 Union u = new Union();
304 Sequence s = body.build(cx, u, false, null);
305 Union u2 = new Union();
306 u2.add(Sequence.singleton(new Element[] {
317 public static class Rep extends ElementNode {
318 public ElementNode e, sep;
319 public boolean zero, many, max;
320 public Rep(ElementNode e, ElementNode sep, boolean zero, boolean many, boolean max) {
321 this.e = e; this.sep = sep; this.zero = zero; this.many = many; this.max = max;}
322 public Element build(Context cx, NonTerminalNode cnt) {
324 ? Sequence.repeat(e.build(cx, null), zero, many, sep==null ? null : sep.build(cx, null), cx.rm.repeatTag())
326 ? Sequence.repeatMaximal(infer(e.build(cx, null)), zero, many, cx.rm.repeatTag())
327 : Sequence.repeatMaximal(e.build(cx, null), zero, many, infer(sep.build(cx, null)), cx.rm.repeatTag());
331 // FIXME: it would be nice if we could hoist this into "Rep"
332 public static @bind.as("++") ElementNode plusmax(final ElementNode e)
333 { return new Rep(e, null, false, true, true); }
334 public static @bind.as("+") ElementNode plus(final ElementNode e)
335 { return new Rep(e, null, false, true, false); }
336 public static @bind.as("++/") ElementNode plusmaxfollow(final ElementNode e, final ElementNode sep)
337 { return new Rep(e, sep, false, true, true); }
338 public static @bind.as("+/") ElementNode plusfollow(final ElementNode e, final ElementNode sep)
339 { return new Rep(e, sep, false, true, false); }
340 public static @bind.as("**") ElementNode starmax(final ElementNode e)
341 { return new Rep(e, null, true, true, true); }
342 public static @bind.as("*") ElementNode star(final ElementNode e)
343 { return new Rep(e, null, true, true, false); }
344 public static @bind.as("**/") ElementNode starmaxfollow(final ElementNode e, final ElementNode sep)
345 { return new Rep(e, sep, true, true, true); }
346 public static @bind.as("*/") ElementNode starfollow(final ElementNode e, final ElementNode sep)
347 { return new Rep(e, sep, true, true, false); }
348 public static @bind.as("?") ElementNode question(final ElementNode e)
349 { return new Rep(e, null, true, true, false); }
350 public static @bind.as("!") ElementNode bang(final ElementNode e)
351 { return new Drop(e); }
353 public static @bind.as("^") ElementNode caret(final String s) {
354 final String thePrefix = prefix;
355 return new Constant(CharRange.string(s)) {
356 public String getOwnerTag() { return thePrefix+s; }
357 public boolean drop() { return true; }
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 throw new Error("warning could not find " + name);
413 nt.build(this, ret, nt);
421 public static abstract class ElementNode {
422 public String getLabel() { return null; }
423 public String getOwnerTag() { return null; }
424 public boolean drop() { return false; }
425 public abstract Element build(Context cx, NonTerminalNode cnt);
428 public static abstract class ElementNodeWrapper extends ElementNode {
429 protected ElementNode _e;
430 public ElementNodeWrapper(ElementNode e) { this._e = e; }
431 public String getLabel() { return _e.getLabel(); }
432 public String getOwnerTag() { return _e.getOwnerTag(); }
433 public boolean drop() { return _e.drop(); }
434 public Element build(Context cx, NonTerminalNode cnt) { return _e.build(cx, cnt); }
437 public static class Constant extends ElementNode {
439 public Constant(Element constant) { this.constant = constant; }
440 public Element build(Context cx, NonTerminalNode cnt) { return constant; }
443 public abstract static class PostProcess extends ElementNodeWrapper {
445 public PostProcess(ElementNode e) { super(e); }
446 public Element build(Context cx, NonTerminalNode cnt) { return postProcess(_e.build(cx, cnt)); }
447 public abstract Element postProcess(Element e);
450 public static class Drop extends ElementNodeWrapper {
451 public Drop(ElementNode e) { super(e); }
452 public boolean drop() { return true; }
455 public static class Label extends ElementNodeWrapper {
457 public Label(String label, ElementNode e) { super(e); this.label = label; }
458 public String getLabel() { return label; }