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 = 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);
128 urep.add(Sequence.singleton(new Element[] { cx.get(sep), u }, 1));
130 for(int i=0; i<sequences.length; i++) {
131 Seq[] group = sequences[i];
132 Union u2 = new Union();
133 if (sequences.length==1) u2 = u;
134 for(int j=0; j<group.length; j++) {
135 Union u3 = new Union();
136 group[j].build(cx, u3, false, this);
137 Sequence s = Sequence.unwrap(new Element[] { u3, urep },
139 new boolean[] { false, false });
142 if (sequences.length==1) break;
143 Sequence seq = Sequence.singleton(u2);
144 for(Sequence s : bad2) {
149 bad2.add(Sequence.singleton(u2));
154 public static @bind.as("=") NonTerminalNode go(@bind.arg String name, @bind.arg Seq[][] sequences) {
155 return new NonTerminalNode(name, sequences, true); }
156 public static @bind.as("=") NonTerminalNode go(@bind.arg String name, @bind.arg String sep, @bind.arg Seq[][] sequences) {
157 return new NonTerminalNode(name, sequences, true, sep); }
159 public static class AnonUnionNode extends UnionNode {
160 public @bind.as("(") AnonUnionNode(Seq[][] sequences) {
161 this.sequences = sequences;
163 public Element build(Context cx, NonTerminalNode cnt) {
164 Union ret = new Union();
170 public static class Range {
171 public @bind Range(char only) { first = only; last = only; }
172 public @bind Range(char first, char last) { this.first = first; this.last = last; }
177 public static /*abstract*/ class Seq {
178 HashSet<Seq> and = new HashSet<Seq>();
179 HashSet<Seq> not = new HashSet<Seq>();
180 ElementNode[] elements;
184 public void append(ElementNode e) {
185 ElementNode[] elements = new ElementNode[this.elements.length+1];
186 System.arraycopy(this.elements, 0, elements, 0, this.elements.length);
187 this.elements = elements;
188 elements[elements.length-1] = e;
190 public Seq(ElementNode e) { this(new ElementNode[] { e }); }
191 public Seq(ElementNode[] elements) { this.elements = elements; }
192 public Seq tag(String tag) { this.tag = prefix+tag; return this; }
193 public Seq follow(ElementNode follow) { this.follow = follow; return this; }
195 Seq ret = new Seq(elements);
199 ret.tag = prefix+tag;
202 public Seq and(Seq s) { and.add(s); s.lame = true; return this; }
203 public Seq andnot(Seq s) { not.add(s); s.lame = true; return this; }
204 public Seq separate(ElementNode sep) {
205 ElementNode[] elements = new ElementNode[this.elements.length * 2 - 1];
206 for(int i=0; i<this.elements.length; i++) {
207 elements[i*2] = this.elements[i];
208 if (i<this.elements.length-1)
209 elements[i*2+1] = new Drop(sep);
211 this.elements = elements;
214 public Sequence build(Context cx, Union u, boolean lame, NonTerminalNode cnt) {
215 Sequence ret = build0(cx, lame || this.lame, cnt);
216 for(Seq s : and) { Sequence dork = s.build(cx, u, true, cnt); ret = ret.and(dork); }
217 for(Seq s : not) { Sequence dork = s.build(cx, u, true, cnt); ret = ret.not(dork); }
222 public Sequence build0(Context cx, boolean lame, NonTerminalNode cnt) {
223 boolean dropAll = lame;
224 if (tag!=null && tag.endsWith("()")) dropAll = true;
225 boolean[] drops = new boolean[elements.length];
226 Element[] els = new Element[elements.length];
227 for(int i=0; i<elements.length; i++) {
228 drops[i] = elements[i].drop();
229 els[i] = elements[i].build(cx, cnt);
230 if (elements[i].getOwnerTag() != null)
231 tag = elements[i].getOwnerTag();
234 if (dropAll) ret = Sequence.drop(els, false);
236 Production prod = new Production(tag, (cnt==null?null:cnt.name), els, drops);
237 ret = cx.rm.createSequence(prod);
240 for(int i=0; i<els.length; i++)
242 if (idx==-1) idx = i;
243 else throw new Error("multiple non-dropped elements in sequence: " + Sequence.drop(els,false));
244 if (idx != -1) ret = Sequence.singleton(els, idx);
245 else ret = Sequence.drop(els, false);
248 if (this.follow != null)
249 ret.follow = infer(this.follow.build(cx, null));
250 ret.lame = this.lame;
254 public static @bind.as("&") Seq and2(Seq s, Seq a) { return s.and(a); }
255 public static @bind.as("&~") Seq andnot2(Seq s, Seq a) { return s.andnot(a); }
256 public static @bind.as("->") Seq arrow(Seq s, ElementNode e) { return s.follow(e); }
257 public static @bind.as("::") Seq tag(String tagname, Seq s) { return s.tag(tagname); }
258 public static @bind.as("/") Seq slash(Seq s, ElementNode e) { return s.separate(e); }
260 public static Seq seq(ElementNode[] elements) { return new Seq(elements); }
261 public static @bind.as("Elements") Seq seq2(ElementNode[] elements) { return new Seq(elements); }
262 public static @bind.as Seq psx(Seq s) { return s; }
263 public static @bind.as(":") ElementNode colon(String s, ElementNode e) { return new Label(s, e); }
264 public static @bind.as(")") void close(String foo) { throw new Error("not supported"); }
265 public static @bind.as("()") ElementNode epsilon() { return new Constant(Union.epsilon); }
267 public static class NonTerminalReferenceNode extends ElementNode {
268 public String nonTerminal;
269 public NonTerminalReferenceNode() { }
270 public @bind.as("NonTerminalReference") NonTerminalReferenceNode(String nonTerminal) {
271 this.nonTerminal = prefix + nonTerminal;
273 public Element build(Context cx, NonTerminalNode cnt) {
274 if (!this.nonTerminal.startsWith(prefix)) nonTerminal = prefix + nonTerminal;
275 Element ret = cx.get(nonTerminal);
276 if (ret == null) throw new RuntimeException("unknown nonterminal \""+nonTerminal+"\"");
281 public static class Literal extends Constant {
282 public @bind Literal(@bind.arg String string) { super(CharRange.string(string)); }
283 public boolean drop() { return true; }
286 public static class CharClass extends ElementNode {
288 public @bind.as("[") CharClass(Range[] ranges) { this.ranges = ranges; }
289 public Element build(Context cx, NonTerminalNode cnt) {
290 edu.berkeley.sbp.util.Range.Set set = new edu.berkeley.sbp.util.Range.Set();
291 for(Range r : ranges)
292 set.add(r.first, r.last);
293 return CharRange.set(set);
297 public static @bind.as("{") class XTree extends ElementNode {
298 public @bind.arg Seq body;
299 public Element build(Context cx, NonTerminalNode cnt) {
300 Union u = new Union();
301 Sequence s = body.build(cx, u, false, null);
302 Union u2 = new Union();
303 u2.add(Sequence.singleton(new Element[] {
314 public static class Rep extends ElementNode {
315 public ElementNode e, sep;
316 public boolean zero, many, max;
317 public Rep(ElementNode e, ElementNode sep, boolean zero, boolean many, boolean max) {
318 this.e = e; this.sep = sep; this.zero = zero; this.many = many; this.max = max;}
319 public Element build(Context cx, NonTerminalNode cnt) {
321 ? Sequence.repeat(e.build(cx, null), zero, many, sep==null ? null : sep.build(cx, null), cx.rm.repeatTag())
323 ? Sequence.repeatMaximal(infer(e.build(cx, null)), zero, many, cx.rm.repeatTag())
324 : Sequence.repeatMaximal(e.build(cx, null), zero, many, infer(sep.build(cx, null)), cx.rm.repeatTag());
328 // FIXME: it would be nice if we could hoist this into "Rep"
329 public static @bind.as("++") ElementNode plusmax(final ElementNode e)
330 { return new Rep(e, null, false, true, true); }
331 public static @bind.as("+") ElementNode plus(final ElementNode e)
332 { return new Rep(e, null, false, true, false); }
333 public static @bind.as("++/") ElementNode plusmaxfollow(final ElementNode e, final ElementNode sep)
334 { return new Rep(e, sep, false, true, true); }
335 public static @bind.as("+/") ElementNode plusfollow(final ElementNode e, final ElementNode sep)
336 { return new Rep(e, sep, false, true, false); }
337 public static @bind.as("**") ElementNode starmax(final ElementNode e)
338 { return new Rep(e, null, true, true, true); }
339 public static @bind.as("*") ElementNode star(final ElementNode e)
340 { return new Rep(e, null, true, true, false); }
341 public static @bind.as("**/") ElementNode starmaxfollow(final ElementNode e, final ElementNode sep)
342 { return new Rep(e, sep, true, true, true); }
343 public static @bind.as("*/") ElementNode starfollow(final ElementNode e, final ElementNode sep)
344 { return new Rep(e, sep, true, true, false); }
345 public static @bind.as("?") ElementNode question(final ElementNode e)
346 { return new Rep(e, null, true, true, false); }
347 public static @bind.as("!") ElementNode bang(final ElementNode e)
348 { return new Drop(e); }
350 public static @bind.as("^") ElementNode caret(final String s) {
351 final String thePrefix = prefix;
352 return new Constant(CharRange.string(s)) {
353 public String getOwnerTag() { return thePrefix+s; }
354 public boolean drop() { return true; }
358 public static @bind.as("~") ElementNode tilde(final ElementNode e) {
359 return new PostProcess(e) {
360 public Element postProcess(Element e) {
361 return infer((Topology<Character>)Atom.toAtom(e).complement().minus(CharRange.braces));
364 public static @bind.as("Word") String word(String s) { return s; }
365 public static @bind.as("Quoted") String quoted(String s) { return s; }
366 public static @bind.as("escaped") String c(char c) { return c+""; }
367 public static @bind.as("EmptyString") String emptystring() { return ""; }
368 public static @bind.as("\n") String retur() { return "\n"; }
369 public static @bind.as("\r") String lf() { return "\r"; }
371 static Atom infer(Element e) { return infer((Topology<Character>)Atom.toAtom(e)); }
372 static Atom infer(Topology<Character> t) { return new CharRange(new CharTopology(t)); }
374 public static class Context {
375 public HashMap<String,Union> map = new HashMap<String,Union>();
376 public GrammarNode grammar;
377 public String cnt = null;
378 public Grammar.Bindings rm;
379 public Context(GrammarNode g, Grammar.Bindings rm) {
383 public Union build() {
385 for(NonTerminalNode nt : grammar.values()) {
386 Union u = get(nt.name);
387 if ("s".equals(nt.name))
392 public Context(Tree t, Grammar.Bindings rm) {
394 Tree.TreeFunctor<Object,Object> red = (Tree.TreeFunctor<Object,Object>)t.head();
395 this.grammar = (GrammarNode)red.invoke(t);
397 public Union peek(String name) { return map.get(name); }
398 public void put(String name, Union u) { map.put(name, u); }
399 public Union get(String name) {
400 Union ret = map.get(name);
401 if (ret != null) return ret;
402 ret = new Union(name);
404 NonTerminalNode nt = grammar.get(name);
406 //System.err.println("*** warning could not find " + name);
407 throw new Error("warning could not find " + name);
411 nt.build(this, ret, nt);
419 public static abstract class ElementNode {
420 public String getLabel() { return null; }
421 public String getOwnerTag() { return null; }
422 public boolean drop() { return false; }
423 public abstract Element build(Context cx, NonTerminalNode cnt);
426 public static abstract class ElementNodeWrapper extends ElementNode {
427 protected ElementNode _e;
428 public ElementNodeWrapper(ElementNode e) { this._e = e; }
429 public String getLabel() { return _e.getLabel(); }
430 public String getOwnerTag() { return _e.getOwnerTag(); }
431 public boolean drop() { return _e.drop(); }
432 public Element build(Context cx, NonTerminalNode cnt) { return _e.build(cx, cnt); }
435 public static class Constant extends ElementNode {
437 public Constant(Element constant) { this.constant = constant; }
438 public Element build(Context cx, NonTerminalNode cnt) { return constant; }
441 public abstract static class PostProcess extends ElementNodeWrapper {
443 public PostProcess(ElementNode e) { super(e); }
444 public Element build(Context cx, NonTerminalNode cnt) { return postProcess(_e.build(cx, cnt)); }
445 public abstract Element postProcess(Element e);
448 public static class Drop extends ElementNodeWrapper {
449 public Drop(ElementNode e) { super(e); }
450 public boolean drop() { return true; }
453 public static class Label extends ElementNodeWrapper {
455 public Label(String label, ElementNode e) { super(e); this.label = label; }
456 public String getLabel() { return label; }