public class MetaGrammar {
- public static boolean harsh = true;
-
public static void main(String[] args) throws Exception {
if (args.length != 2) {
System.err.println("usage: java " + MetaGrammar.class.getName() + " grammarfile.g com.yourdomain.package.ClassName");
System.exit(-1);
}
- //StringBuffer sbs = new StringBuffer();
- //((MetaGrammar)new MetaGrammar().walk(meta)).nt.get("e").toString(sbs);
- //System.err.println(sbs);
String className = args[1].substring(args[1].lastIndexOf('.')+1);
String packageName = args[1].substring(0, args[1].lastIndexOf('.'));
String fileName = packageName.replace('.', '/') + "/" + className + ".java";
out.append("\n // DO NOT EDIT STUFF BELOW: IT IS AUTOMATICALLY GENERATED\n");
- /*
- ReflectiveMeta m = new ReflectiveMeta();
- Tree<String> res = new CharParser(MetaGrammar.make()).parse(new FileInputStream(args[0])).expand1();
- MetaGrammar.Meta.MetaGrammarFile mgf = m.new MetaGrammarFile(res);
- MetaGrammar.BuildContext bc = new MetaGrammar.BuildContext(mgf);
-
- Union meta = mgf.get("s").build(bc);
- Tree t = new CharParser(meta).parse(new FileInputStream(args[0])).expand1();
- */
Tree t = MetaGrammarTree.meta;
Union u = MetaGrammar.make(t, "s");
System.err.println("== parsing with parsed grammar =================================================================================");
t = new CharParser((Union)u).parse(new FileInputStream(args[0])).expand1();
System.out.println(t.toPrettyString());
- //Forest<String> fs = new CharParser(make()).parse(new FileInputStream(args[0]));
- //System.out.println(fs.expand1());
-
- //GraphViz gv = new GraphViz();
- //fs.toGraphViz(gv);
- //FileOutputStream fox = new FileOutputStream("out.dot");
- //gv.dump(fox);
- //fox.close();
t.toJava(out);
out.append("\n // DO NOT EDIT STUFF ABOVE: IT IS AUTOMATICALLY GENERATED\n");
os.close();
}
- public static class ReflectiveMetaPlain extends ReflectiveMeta {
- public Object repeatTag() { return null; }
- public Sequence tryResolveTag(String tag, String nonTerminalName, Element[] els, Object[] labels, boolean[] drops) {
- return null; }
- public Sequence resolveTag(String tag, String nonTerminalName, Element[] els, Object[] labels, boolean[] drops) {
- return Sequence.rewritingSequence(tag, els, labels, drops);
- }
- }
-
- public static class ReflectiveMeta /*extends MetaGrammar.Meta*/ {
- private final Class _cl;
- private final Class[] _inner;
- public ReflectiveMeta() {
- this(MG.class);
- }
- public ReflectiveMeta(Class c) {
- this._cl = c;
- this._inner = c.getDeclaredClasses();
- }
- public ReflectiveMeta(Class c, Class[] inner) {
- this._cl = c;
- this._inner = inner;
- }
- public Object repeatTag() {
- return new Tree.ArrayBuildingTreeFunctor<Object>();
- }
- public Sequence tryResolveTag(String tag, String nonTerminalName, Element[] els, Object[] labels, boolean[] drops) {
- Production p = new Production(tag, nonTerminalName, els, labels, drops);
- for(Method m : _cl.getMethods())
- if (new Target(m).isCompatible(p))
- return new Target(m).makeSequence(p);
- for(Class c : _inner)
- for(Constructor con : c.getConstructors())
- if (new Target(con).isCompatible(p))
- return new Target(con).makeSequence(p);
- for(Class c : _inner)
- if (new Target(c).isCompatible(p))
- return new Target(c).makeSequence(p);
- return null;
- }
- public Sequence resolveTag(String tag, String nonTerminalName, Element[] els, Object[] labels, boolean[] drops) {
- Sequence ret = tryResolveTag(tag, nonTerminalName, els, labels, drops);
- if (ret != null) return ret;
- String message = "could not find a Java method/class/ctor matching tag \""+tag+
- "\", nonterminal \""+nonTerminalName+"\" with " + els.length + " arguments";
- if (harsh) {
- throw new RuntimeException(message);
- } else {
- System.err.println(message);
- return Sequence.rewritingSequence(tag, els, labels, drops);
- }
- }
- }
public static class Production {
public boolean isCompatible(Production p) {
bind.as t = getBindAs();
+ bind b = getBind();
+
if (t != null &&
- (t.value().equals(p.tag) ||
- (t.value().equals("") && getName().equals(p.tag))))
+ (t.value().equals(p.tag)))
return buildSequence(p)!=null;
- bind b = getBind();
- System.out.println(_bindable.getClass().getSimpleName() + ": " + _bindable.getSimpleName());
+ if (t != null &&
+ ((t.value().equals("") && getName().equals(p.tag))))
+ return buildSequence(p)!=null;
if (b != null && getName().equals(p.tag))
return buildSequence(p)!=null;
- bind.as n = getBindAs();
- if (n != null &&
- (n.value().equals(p.nonTerminal) ||
- (n.value().equals("") && getName().equals(p.nonTerminal))))
+ if (t != null &&
+ (t.value().equals(p.nonTerminal)))
+ return buildSequence(p)!=null;
+ if (t != null &&
+ ((t.value().equals("") && getName().equals(p.nonTerminal))))
return buildSequence(p)!=null;
-
if (b != null && getName().equals(p.nonTerminal))
return buildSequence(p)!=null;
argTagged++;
// FIXME: can be smarter here
- if (names.length==p.count) {
- int[] ret = new int[p.count];
- for(int i=0; i<p.count; i++) ret[i] = i;
- return ret;
- } else if (argTagged==p.count) {
+ if (argTagged==p.count) {
int[] ret = new int[argtags.length];
int j = 0;
- for(int i=0; i<argtags.length; i++)
- ret[i] = argtags[i]==null ? -1 : (j++);
+ for(int i=0; i<argtags.length; i++) {
+ if (argtags[i]==null) continue;
+ if (argtags[i].value().equals(""))
+ ret[i] = j++;
+ else {
+ ret[i] = -1;
+ for(int k=0; k<names.length; k++)
+ if (argtags[i].value().equals(names[k])){
+ ret[i] = k;
+ break;
+ }
+ if (ret[i]==-1) return null;
+ }
+ }
+ return ret;
+ } else if (names.length==p.count) {
+ int[] ret = new int[p.count];
+ for(int i=0; i<p.count; i++) ret[i] = i;
return ret;
} else {
return null;
ret.add(null);
}
}
- System.err.println("input tree: " + t);
+ //System.err.println("input tree: " + t);
Object[] o = (Object[])ret.toArray(new Object[0]);
int max = 0;
for(int i=0; i<map.length; i++) max = Math.max(map[i], max);
public static Union cached = null;
- public static Union make() {
- /*
- if (cached != null) return cached;
- try {
- ReflectiveMeta m = new ReflectiveMeta();
- Tree<String> res = new CharParser(MetaGrammar.make()).parse(new FileInputStream("tests/meta.g")).expand1();
- MetaGrammar.Meta.MetaGrammarFile mgf = m.new MetaGrammarFile(res);
- MetaGrammar.BuildContext bc = new MetaGrammar.BuildContext(mgf);
- Union meta = mgf.get("s").build(bc);
- Tree t = new CharParser(meta).parse(new FileInputStream("tests/meta.g")).expand1();
- return cached = make(t, "s");
- } catch (Exception e) {
- throw new RuntimeException(e);
- }
- */
- return make(MetaGrammarTree.meta, "s");
- }
- public static Union make(Tree t, String s) { return make(t, s, new ReflectiveMeta()); }
- public static Union make(Tree t, String s, ReflectiveMeta rm) {
- System.out.println("Head: " + t.head());
+ public static Union make() { return make(MetaGrammarTree.meta, "s"); }
+ public static Union make(Tree t, String s) { return make(t, s, new AnnotationGrammarBindingResolver()); }
+ public static Union make(Tree t, String s, GrammarBindingResolver rm) {
Tree.TreeFunctor<Object,Object> red = (Tree.TreeFunctor<Object,Object>)t.head();
- MG.Grammar g = (MG.Grammar)red.invoke(t.children());
+ MetaGrammarBindings.Grammar g = (MetaGrammarBindings.Grammar)red.invoke(t.children());
Context cx = new Context(g,rm);
Union u = null;
- for(MG.NonTerminal nt : g.nonterminals) {
- System.out.println(nt.name);
+ for(MetaGrammarBindings.NonTerminal nt : g.values()) {
Union el = (Union)cx.get(nt.name);
StringBuffer st = new StringBuffer();
el.toString(st);
- System.err.println(st);
if (nt.name.equals(s)) u = el;
}
return u;
- public static class MG {
- public static @bind class Grammar {
- public NonTerminal get(String s) {
- for(NonTerminal nt : nonterminals)
- if (nt.name.equals(s)) return nt;
- return null;
- }
- public @bind.arg NonTerminal[] nonterminals;
- public String toString() {
- String ret = "[ ";
- for(NonTerminal nt : nonterminals) ret += nt + ", ";
- return ret + " ]";
- }
- }
- public abstract static class Un extends El {
- public Seq[][] sequences;
- public void build(Context cx, Union u) {
- HashSet<Sequence> bad2 = new HashSet<Sequence>();
- for(int i=0; i<sequences.length; i++) {
- Seq[] group = sequences[i];
- Union u2 = new Union();
- if (sequences.length==1) u2 = u;
- for(int j=0; j<group.length; j++) {
- group[j].build(cx, u2, false);
- }
- if (sequences.length==1) break;
- Sequence seq = Sequence.singleton(u2);
- for(Sequence s : bad2) {
- s.lame = true;
- seq = seq.not(s);
- }
- u.add(seq);
- bad2.add(Sequence.singleton(u2));
- }
- }
- }
- public static class NonTerminal extends Un {
- public String name = null;
- public @bind NonTerminal(@bind.arg("Word") String name,
- @bind.arg("RHS") Seq[][] sequences) {
- this.name = name;
- this.sequences = sequences;
- }
- public Element build(Context cx) { return cx.get(name); }
- }
-
- public static class AnonUn extends Un {
- public @bind.as("(") AnonUn(Seq[][] sequences) {
- this.sequences = sequences;
- }
- public Element build(Context cx) {
- Union ret = new Union();
- build(cx, ret);
- return ret;
- }
- }
-
- //public static @bind.as void range(char c) { }
- public static class Range {
- public @bind.as("range") Range(char only) { first = only; last = only; }
- public @bind.as("-") Range(char first, char last) { this.first = first; this.last = last; }
- public char first;
- public char last;
- }
- 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 String getOwnerTag() { return e.getOwnerTag(); }
- 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 String getOwnerTag() { return e.getOwnerTag(); }
- 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;
- boolean lame;
- 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); s.lame = true; return this; }
- public Seq andnot(Seq s) { not.add(s); s.lame = true; 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, Union u, boolean lame) {
- Sequence ret = build0(cx, lame || this.lame);
- for(Seq s : and) { Sequence dork = s.build(cx, u, true); ret = ret.and(dork); }
- for(Seq s : not) { Sequence dork = s.build(cx, u, true); ret = ret.not(dork); }
- u.add(ret);
- ret.lame = lame;
- return ret;
- }
- public Sequence build0(Context cx, boolean lame) {
- boolean unwrap = false;
- boolean dropAll = lame;
- 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, cx.rm.repeatTag(), drops);
- else if (tag!=null) {
- ret = cx.rm.resolveTag(tag, cx.cnt, els, labels, drops);
- } else {
- ret = cx.rm.tryResolveTag(tag, cx.cnt, els, labels, drops);
- if (ret == null) {
- 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 = infer(this.follow.build(cx));
- ret.lame = this.lame;
- return ret;
- }
- }
- public static @bind.as("&") Seq and(Seq s, El[] elements) { return s.and(seq(elements)); }
- public static @bind.as("&~") Seq andnot(Seq s, El[] elements) { return s.andnot(seq(elements)); }
- public static @bind.as("->") Seq arrow(Seq s, El e) { return s.follow(e); }
- public static @bind.as("::") Seq tag(String tagname, Seq s) { return s.tag(tagname); }
- public static @bind.as("/") Seq slash(Seq s, El e) { return s.separate(e); }
-
- public static @bind.as("ps") Seq seq(El[] elements) { return new Seq(elements); }
- public static @bind.as Seq psx(Seq s) { return s; }
- public static @bind.as(":") El colon(String s, El e) { return new Label(s, e); }
- public static @bind.as(")") void close(String foo) { throw new Error("not supported"); }
- public static @bind.as("()") El epsilon() { return new Constant(Union.epsilon); }
-
- public static @bind.as("nonTerminal") class NonTerminalReference extends El {
- public @bind.arg String nonTerminal;
- public Element build(Context cx) {
- return cx.get(nonTerminal);
- }
- }
-
- public static class StringLiteral extends Constant {
- public @bind.as("literal") StringLiteral(String string) { super(CharRange.string(string)); }
- public boolean drop() { return true; }
- }
-
- public static class CharClass extends El {
- Range[] ranges;
- public @bind.as("[") 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 @bind.as("{") class XTree extends El {
- public @bind.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), cx.rm.repeatTag())
- : sep==null
- ? Sequence.repeatMaximal(infer(e.build(cx)), zero, many, cx.rm.repeatTag())
- : Sequence.repeatMaximal(e.build(cx), zero, many, infer(sep.build(cx)), cx.rm.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 @bind.as("++") El plusmax(final El e) { return new Rep(e, null, false, true, true); }
- public static @bind.as("+") El plus(final El e) { return new Rep(e, null, false, true, false); }
- public static @bind.as("++/") El plusmaxfollow(final El e, final El sep) { return new Rep(e, sep, false, true, true); }
- public static @bind.as("+/") El plusfollow(final El e, final El sep) { return new Rep(e, sep, false, true, false); }
- public static @bind.as("**") El starmax(final El e) { return new Rep(e, null, true, true, true); }
- public static @bind.as("*") El star(final El e) { return new Rep(e, null, true, true, false); }
- public static @bind.as("**/") El starmaxfollow(final El e, final El sep) { return new Rep(e, sep, true, true, true); }
- public static @bind.as("*/") El starfollow(final El e, final El sep) { return new Rep(e, sep, true, true, false); }
- public static @bind.as("?") El question(final El e) { return new Rep(e, null, true, true, false); }
-
- public static @bind.as("!") El bang(final El e) { return new Drop(e); }
-
- public static @bind.as("^") El caret(final String s) {
- return new Drop(new Constant(CharRange.string(s)) {
- public String getOwnerTag() { return s; }
- });
- }
-
- public static @bind.as("~") El tilde(final El e) {
- return new PostProcess(e) {
- public Element postProcess(Element e) {
- return infer((Topology<Character>)Atom.toAtom(e).complement());
- } }; }
-
- public static @bind.as("^^") void doublecaret(final El e) { throw new Error("not implemented"); }
-
- //public static @bind.as("(") El subexpression(Seq[][] rhs) { return new NonTerminal(rhs); }
-
- public static @bind.as("Word") String word(String s) { return s; }
- public static @bind.as("Quoted") String quoted(String s) { return s; }
- public static @bind.as("escaped") String c(char c) { return c+""; }
- public static @bind.as("\"\"") String emptystring() { return ""; }
- public static @bind.as("\n") String retur() { return "\n"; }
- public static @bind.as("\r") String lf() { return "\r"; }
-
- }
public static class Context {
- HashMap<String,Union> map = new HashMap<String,Union>();
- private MG.Grammar grammar;
+ public HashMap<String,Union> map = new HashMap<String,Union>();
+ public MetaGrammarBindings.Grammar grammar;
public String cnt = null;
- private ReflectiveMeta rm;
- public Context(MG.Grammar g, ReflectiveMeta rm) {
+ public GrammarBindingResolver rm;
+ public Context(MetaGrammarBindings.Grammar g, GrammarBindingResolver rm) {
this.grammar = g;
this.rm = rm;
}
public Union build() {
Union ret = null;
- for(MG.NonTerminal nt : grammar.nonterminals) {
+ for(MetaGrammarBindings.NonTerminal nt : grammar.values()) {
Union u = get(nt.name);
if ("s".equals(nt.name))
ret = u;
}
return ret;
}
- public Context(Tree t, ReflectiveMeta rm) {
+ public Context(Tree t, GrammarBindingResolver rm) {
this.rm = rm;
Tree.TreeFunctor<Object,Object> red = (Tree.TreeFunctor<Object,Object>)t.head();
- this.grammar = (MG.Grammar)red.invoke(t.children());
+ this.grammar = (MetaGrammarBindings.Grammar)red.invoke(t.children());
}
public Union peek(String name) { return map.get(name); }
public void put(String name, Union u) { map.put(name, u); }
if (ret != null) return ret;
ret = new Union(name);
map.put(name, ret);
- MG.NonTerminal nt = grammar.get(name);
+ MetaGrammarBindings.NonTerminal nt = grammar.get(name);
if (nt==null) {
System.err.println("*** warning could not find " + name);
} else {
projects / sbp.git / blobdiff