import java.io.*;
public class Demo {
+
+ public static boolean harsh = false;
+
public static void main(String[] s) throws Exception {
+
+ ReflectiveMeta m = new ReflectiveMeta();
Tree<String> res = new CharParser(MetaGrammar.make()).parse(new FileInputStream(s[0])).expand1();
-
- MetaGrammar.Meta m =
- new ReflectiveMeta(MG.class,
- new Class[] {
- MG.Grammar.class,
- MG.NonTerminal.class,
- MG.Range.class,
- MG.El.class,
- MG.Seq.class,
- MG.NonTerminalReference.class,
- MG.StringLiteral.class,
- MG.Epsilon.class,
- MG.Tree.class,
- MG.CharClass.class
- });
MetaGrammar.Meta.MetaGrammarFile mgf = m.new MetaGrammarFile(res);
MetaGrammar.BuildContext bc = new MetaGrammar.BuildContext(mgf);
- Union meta = mgf.get("s").build(bc);
- System.err.println("parsing " + s[1]);
+ Union meta = mgf.get("s").build(bc);
Tree t = new CharParser(meta).parse(new FileInputStream(s[1])).expand1();
+ Union u = Demo.make(t, "s");
+
+ System.err.println();
+ System.err.println("== parsing with parsed grammar =================================================================================");
+ t = new CharParser((Union)u).parse(new FileInputStream(s[1])).expand1();
+ System.out.println(t.toPrettyString());
+
+ System.err.println("== parsing with parsed-parsed grammar ==========================================================================");
+ t = new CharParser(new Context(t, m).build()).parse(new FileInputStream(s[1])).expand1();
System.out.println(t.toPrettyString());
- Reducer red = (Reducer)t.head();
- System.out.println(red.reduce(t));
+ }
+
+ 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,
+ new Class[] {
+ MG.Grammar.class,
+ MG.AnonUn.class,
+ MG.Range.class,
+ MG.El.class,
+ MG.Seq.class,
+ MG.NonTerminal.class,
+ MG.NonTerminalReference.class,
+ MG.StringLiteral.class,
+ MG.XTree.class,
+ MG.CharClass.class
+ });
+ }
public ReflectiveMeta(Class c, Class[] inner) {
this._cl = c;
this._inner = inner;
if (c != null && t.equals("") && c.getSimpleName().equals(s)) return true;
return false;
}
+ /*
private boolean match(nonterminal t, Class c, String s) {
if (t==null) return false;
if (t.value().equals(s)) return true;
if (c != null && t.equals("") && c.getSimpleName().equals(s)) return true;
return false;
}
+ */
private boolean match(Class c, String s, String nonTerminalName) {
if (match((tag)c.getAnnotation(tag.class), c, s)) return true;
- if (match((nonterminal)c.getAnnotation(nonterminal.class), c, nonTerminalName)) return true;
+ //if (match((nonterminal)c.getAnnotation(tag.class), c, nonTerminalName)) return true;
return false;
}
public boolean match(Constructor con, String s, String nonTerminalName) {
Class c = con.getDeclaringClass();
if (match((tag)con.getAnnotation(tag.class), null, s)) return true;
- if (match((nonterminal)con.getAnnotation(nonterminal.class), c, s)) return true;
+ //if (match((nonterminal)con.getAnnotation(tag.class), c, s)) return true;
return false;
}
public Object repeatTag() {
- return new Reducer() {
- public String toString() { return "[**]"; }
- public Object reduce(Tree t) {
- Object[] ret = new Object[t.numChildren()];
- for(int i=0; i<t.numChildren(); i++) {
- Tree tc = t.child(i);
- if (tc.head() != null && tc.head() instanceof Reducer)
- ret[i] = ((Reducer)tc.head()).reduce(tc);
- else if (tc.numChildren() == 0)
- ret[i] = tc.head();
- else {
- System.err.println("FIXME: don't know what to do about " + tc);
- ret[i] = null;
- }
- }
- return ret;
- }
- };
+ return new Tree.ArrayBuildingTreeFunctor<Object>();
}
- public Sequence resolveTag(String tag, String nonTerminalName, Element[] els, Object[] labels, boolean[] drops) {
+ 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 TargetMethod(m).isCompatible(p))
for(Class c : _inner)
if (new TargetClass(c).isCompatible(p))
return new TargetClass(c).makeSequence(p);
- throw new RuntimeException("could not find a Java method/class/ctor matching tag \""+tag+"\", nonterminal \""+nonTerminalName+"\"");
+ 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 Object makeFlattener(final Method m, final Element[] els, final Object[] labels, final boolean[] drops) {
- return new Reducer() {
- public Object reduce(Tree t) {
- Object[] o = new Object[m.getParameterTypes()];
- int j = 0;
- for(int i=0; i<els.length; i++)
- }
- };
- }
- */
/**
* that is arg-compatible. If value() is undefined, then the
* class/constructor/method name is used.
*/
+ /*
@Retention(RetentionPolicy.RUNTIME) public static @interface nonterminal { String value() default ""; }
+ */
+
+ @Retention(RetentionPolicy.RUNTIME) public static @interface raw { }
/**
* Constructors, classes, and methods with this attribute will
public int count = 0;
public Production(String tag, String nonTerminal, Element[] elements, Object[] labels, boolean[] drops) {
this.tag = tag;
- this.elements = elements; // FIXME: use this
+ this.elements = elements;
this.nonTerminal = nonTerminal;
this.labels = labels;
this.drops = drops;
}
public static abstract class Target {
- public abstract String getName();
- public abstract tag getTag();
- public abstract nonterminal getNonTerminal();
public abstract int[] buildSequence(Production p);
+ private Reflection.Bindable _bindable;
+ public Target(Reflection.Bindable b) { this._bindable = b; }
+
+ public String getName() { return _bindable.getSimpleName(); }
+ public tag getTag() { return (tag)_bindable.getAnnotation(tag.class); }
+ //public nonterminal getNonTerminal() { return (nonterminal)_bindable.getAnnotation(tag.class); }
+ public String toString() { return _bindable.getSimpleName(); }
+ public Object plant(Object[] fields) { return _bindable.impose(fields); }
+ public boolean isRaw() { return _bindable.isAnnotationPresent(raw.class); }
+ public Object invokeRaw(Iterable<Tree<Object>> t) { return _bindable.impose(new Object[] { t }); }
+
public boolean isCompatible(Production p) {
tag t = getTag();
if (t != null &&
(t.value().equals(p.tag) ||
- (t.value().equals("") && p.tag.equals(getName()))))
+ (t.value().equals("") && getName().equals(p.tag))))
return buildSequence(p)!=null;
- nonterminal n = getNonTerminal();
+ tag n = getTag();
if (n != null &&
(n.value().equals(p.nonTerminal) ||
- (n.value().equals("") && p.nonTerminal.equals(getName()))))
+ (n.value().equals("") && getName().equals(p.nonTerminal))))
return buildSequence(p)!=null;
return false;
}
+
public int[] buildSequence(Production p, String[] names, arg[] argtags) {
int argTagged = 0;
for(int i=0; i<argtags.length; i++)
}
}
public Sequence makeSequence(Production p) {
- return Sequence.rewritingSequence(new TargetReducer(p), p.elements, p.labels, p.drops);
+ return Sequence.rewritingSequence(new TargetReducer(p, buildSequence(p), "reducer-"+this),
+ p.elements, p.labels, p.drops);
}
- public abstract Object plant(Object[] fields, int[] map);
- public class TargetReducer implements Reducer {
+
+ public class TargetReducer implements Tree.TreeFunctor<Object,Object> {
private Production p;
private int[] map;
- public TargetReducer(Production p) {
+ private String name;
+ public TargetReducer(Production p, int[] map, String name) {
this.p = p;
- this.map = buildSequence(p);
+ this.map = map;
+ this.name = name;
}
- public String toString() { return "reducer-"+Target.this; }
- public Object reduce(Tree t) {
- Object[] objects = new Object[t.numChildren()];
- for(int i=0; i<t.numChildren(); i++) {
- Tree tc = t.child(i);
- if (tc.head() != null && tc.head() instanceof Reducer)
- objects[i] = ((Reducer)tc.head()).reduce(tc);
+ public String toString() { return name; }
+ public Object invoke(Iterable<Tree<Object>> t) {
+ if (isRaw()) return invokeRaw(t);
+ ArrayList ret = new ArrayList();
+ for(Tree tc : t) {
+ if (tc.head() != null && tc.head() instanceof Functor)
+ ret.add(((Tree.TreeFunctor<Object,Object>)tc.head()).invoke(tc.children()));
else if (tc.numChildren() == 0)
- objects[i] = tc.head();
- else if (t.numChildren()==1) {
- //FIXME: EVIL!!
- objects[i] = reduce(t.child(0));
- } else {
+ ret.add(tc.head());
+ else {
System.err.println("FIXME: don't know what to do about " + tc);
- objects[i] = null;
+ ret.add(null);
}
}
- return plant(objects, map);
+ 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);
+ Object[] o2 = new Object[max+1];
+ for(int i=0; i<o.length; i++) o2[map[i]] = o[i];
+ return plant(o2);
}
}
}
- public static interface Reducer {
- public Object reduce(Tree t);
- }
-
public static class TargetClass extends Target {
public final Class _class;
- public TargetClass(Class _class) { this._class = _class; }
- public String getName() { return _class.getSimpleName(); }
- public tag getTag() { return (tag)_class.getAnnotation(tag.class); }
- public nonterminal getNonTerminal() { return (nonterminal)_class.getAnnotation(nonterminal.class); }
- public String toString() { return _class.getSimpleName(); }
+ public TargetClass(Class _class) { super(Reflection.Bindable.create(_class)); this._class = _class; }
public int[] buildSequence(Production p) {
Field[] f = _class.getDeclaredFields();
String[] names = new String[f.length];
return new TargetConstructor(c).buildSequence(p);
return null;
}
- public Object plant(Object[] fields, int[] map) {
- try {
- Object ret = _class.newInstance();
- Field[] f = _class.getFields();
- int j = 0;
- for(int i=0; i<f.length; i++)
- if (map[i] != -1) {
- Object tgt = Reflection.lub(fields[map[i]]);
- if (f[i].getType() == String.class) tgt = stringify(tgt);
- // FUGLY
- tgt = coerce(tgt, f[i].getType());
- System.err.println("setting a " + f[i].getType().getName() + " to " + Reflection.show(tgt));
- f[i].set(ret, tgt);
- }
- return ret;
- } catch (Exception e) {
- e.printStackTrace();
- throw new RuntimeException(e);
- }
- }
- }
-
- public static String stringify(Object o) {
- if (o==null) return "";
- if (!(o instanceof Object[])) return o.toString();
- Object[] arr = (Object[])o;
- StringBuffer ret = new StringBuffer();
- for(int i=0; i<arr.length; i++)
- ret.append(arr[i]);
- return ret.toString();
}
public static class TargetConstructor extends Target {
public final Constructor _ctor;
- public TargetConstructor(Constructor _ctor) { this._ctor = _ctor; }
- public String getName() { return _ctor.getName(); }
- public tag getTag() { return (tag)_ctor.getAnnotation(tag.class); }
- public nonterminal getNonTerminal() { return (nonterminal)_ctor.getAnnotation(nonterminal.class); }
- public String toString() { return _ctor.getName(); }
+ public TargetConstructor(Constructor _ctor) { super(Reflection.Bindable.create(_ctor)); this._ctor = _ctor; }
public int[] buildSequence(Production p) {
Annotation[][] annotations = _ctor.getParameterAnnotations();
int len = annotations.length;
argtags[i+ofs] = (arg)a;
return buildSequence(p, names, argtags);
}
- public Object plant(Object[] fields, int[] map) {
- try {
- Class[] argTypes = _ctor.getParameterTypes();
- Object[] args = new Object[argTypes.length];
- int j = 0;
- for(int i=0; i<args.length; i++)
- if (map[i] != -1) {
- Object tgt = Reflection.lub(fields[map[i]]);
- if (argTypes[i] == String.class) tgt = stringify(tgt);
- // FUGLY
- tgt = coerce(tgt, argTypes[i]);
- System.err.println("setting a " + argTypes[i].getName() + " to " + Reflection.show(tgt));
- args[i] = tgt;
- }
- return _ctor.newInstance(args);
- } catch (Exception e) {
- throw new RuntimeException(e);
- }
- }
}
public static class TargetMethod extends Target {
public final Method _method;
- public TargetMethod(Method _method) { this._method = _method; }
- public String getName() { return _method.getName(); }
- public String toString() { return _method.getName(); }
- public tag getTag() { return (tag)_method.getAnnotation(tag.class); }
- public nonterminal getNonTerminal() { return (nonterminal)_method.getAnnotation(nonterminal.class); }
+ public TargetMethod(Method _method) { super(Reflection.Bindable.create(_method)); this._method = _method; }
public int[] buildSequence(Production p) {
Annotation[][] annotations = _method.getParameterAnnotations();
String[] names = new String[annotations.length];
int[] ret = buildSequence(p, names, argtags);
return ret;
}
- public Object plant(Object[] fields, int[] map) {
- try {
- Class[] argTypes = _method.getParameterTypes();
- Object[] args = new Object[argTypes.length];
- int j = 0;
- for(int i=0; i<args.length; i++)
- if (map[i] != -1) {
- Object tgt = Reflection.lub(fields[map[i]]);
- if (argTypes[i] == String.class) tgt = stringify(tgt);
- // FUGLY
- tgt = coerce(tgt, argTypes[i]);
- System.err.println("setting a " + argTypes[i].getName() + " to " + Reflection.show(tgt));
- args[i] = tgt;
- }
- return _method.invoke(null, args);
- } catch (Exception e) {
- throw new RuntimeException(e);
- }
- }
}
- public static Object coerce(Object o, Class c) {
- if (o==null) return null;
- if (c.isInstance(o)) return o;
- if (c == char.class) {
- return o.toString().charAt(0);
+ 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);
}
- if (c.isArray() && (c.getComponentType().isInstance(o))) {
- Object[] ret = (Object[])Array.newInstance(c.getComponentType(), 1);
- ret[0] = o;
- return ret;
- }
- if (o.getClass().isArray() && c.isArray()) {
- boolean ok = true;
- for(int i=0; i<((Object[])o).length; i++) {
- Object ob = (((Object[])o)[i]);
- if (ob != null) {
- System.err.println("no hit with " + c.getComponentType().getName() + " on " + Reflection.show(((Object[])o)[i]));
- ok = false;
- }
- }
- if (ok) {
- System.err.println("hit with " + c.getComponentType().getName());
- return Array.newInstance(c.getComponentType(), ((Object[])o).length);
- }
+ }
+ public static Union make(Tree t, String s) { return make(t, s, new ReflectiveMeta()); }
+ public static Union make(Tree t, String s, ReflectiveMeta rm) {
+ Tree.TreeFunctor<Object,Object> red = (Tree.TreeFunctor<Object,Object>)t.head();
+ MG.Grammar g = (MG.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);
+ 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 o;
+ return u;
}
public static class MG {
- public static @tag Grammar grammar(Grammar g) { return g; }
- public static @nonterminal class Grammar {
+ public static @tag("grammar") class Grammar {
+ public NonTerminal get(String s) {
+ for(NonTerminal nt : nonterminals)
+ if (nt.name.equals(s))
+ return nt;
+ return null;
+ }
public @arg("NonTerminal") NonTerminal[] nonterminals;
public String toString() {
String ret = "[ ";
return ret + " ]";
}
}
- public static @nonterminal class NonTerminal extends El {
- public @arg("Word") String name;
- public @arg("RHS") Seq[][] sequences;
+ 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 @tag("=") NonTerminal(@arg("Word") String name,
+ @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 @tag("(") AnonUn(Seq[][] sequences) {
+ this.sequences = sequences;
+ }
+ public Element build(Context cx) {
+ Union ret = new Union();
+ build(cx, ret);
+ return ret;
+ }
}
- public static @tag void range(char c) { }
- public static class Range extends El {
+ //public static @tag void range(char c) { }
+ public static class Range {
public @tag("range") Range(char only) { first = only; last = only; }
public @tag("-") Range(char first, char last) { this.first = first; this.last = last; }
public char first;
public char last;
}
- public static class El { }
- public static /*abstract*/ @nonterminal("Sequence") class Seq extends El { }
- public static @tag("&") Seq and(Sequence s, El[] elements) { return new Seq(); }
- public static @tag("&~") Seq andnot(Sequence s, El[] elements) { return new Seq(); }
- public static @tag Seq ps(El[] elements) { return new Seq(); }
- public static @tag Seq psx(Seq s) { return s; }
- public static @tag("::") Seq tag(String tagname, Seq seq) { return new Seq(); }
- public static @tag(":") void colon(String s, El e) { }
- public static @tag(")") void close(String foo) { }
- public static @tag("/") Seq slash(Seq s, El e) { return new Seq(); }
- public static @tag("->") Seq arrow(Seq s, El e) { return new Seq(); }
-
- public static @tag("nonTerminal") class NonTerminalReference extends El { public @arg String nonTerminal; }
- public static @tag("literal") class StringLiteral extends El { public @arg String string; }
- public static @tag("()") class Epsilon extends El { }
- public static @tag("{") class Tree extends El { public @arg Seq body; }
- public static class CharClass extends El { public @tag("[") CharClass(Range[] ranges) { } }
-
- public static @tag("++") void plusmax(El e) { }
- public static @tag("+") void plus(El e) { }
- public static @tag("++/") void plusmaxfollow(El e, El sep) { }
- public static @tag("+/") void plusfollow(El e, El sep) { }
- public static @tag("**") void starmax(El e) { }
- public static @tag("*") void star(El e) { }
- public static @tag("**/") void starmaxfollow(El e, El sep) { }
- public static @tag("*/") void starfollow(El e, El sep) { }
- public static @tag("!") void bang(El e) { }
- public static @tag("?") void question(El e) { }
- public static @tag("^") void caret(String s) { }
- public static @tag("~") void tilde(El e) { }
- public static @tag("^^") void doublecaret(El e) { }
- public static @tag("(") void subexpression(/*Seq[][]*/Object rhs) { }
-
- public static @nonterminal("Word") String word(String s) { return null; }
- public static @nonterminal("Quoted") String quoted(String s) { return null; }
- public static @nonterminal("escaped") String c(char c) { return null; }
- public static @tag("\"\"") String emptystring() { return null; }
- public static @tag("\r") String lf() { return null; }
- public static @tag("\n") String cr() { return null; }
+ 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 {
+ 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 = MetaGrammar.infer(this.follow.build(cx));
+ ret.lame = this.lame;
+ return ret;
+ }
+ }
+ public static @tag("&") Seq and(Seq s, El[] elements) { return s.and(seq(elements)); }
+ public static @tag("&~") Seq andnot(Seq s, El[] elements) { return s.andnot(seq(elements)); }
+ public static @tag("->") Seq arrow(Seq s, El e) { return s.follow(e); }
+ public static @tag("::") Seq tag(String tagname, Seq s) { return s.tag(tagname); }
+ public static @tag("/") Seq slash(Seq s, El e) { return s.separate(e); }
+
+ public static @tag("ps") Seq seq(El[] elements) { return new Seq(elements); }
+ public static @tag Seq psx(Seq s) { return s; }
+ public static @tag(":") El colon(String s, El e) { return new Label(s, e); }
+ public static @tag(")") void close(String foo) { throw new Error("not supported"); }
+ public static @tag("()") El epsilon() { return new Constant(Union.epsilon); }
+
+ public static @tag("nonTerminal") class NonTerminalReference extends El {
+ public @arg String nonTerminal;
+ public Element build(Context cx) {
+ return cx.get(nonTerminal);
+ }
+ }
+
+ public static class StringLiteral extends Constant {
+ public @tag("literal") StringLiteral(String string) { super(CharRange.string(string)); }
+ public boolean drop() { return true; }
+ }
+
+ public static class CharClass extends El {
+ Range[] ranges;
+ public @tag("[") 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 @tag("{") class XTree extends El {
+ public @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(MetaGrammar.infer(e.build(cx)), zero, many, cx.rm.repeatTag())
+ : Sequence.repeatMaximal(e.build(cx), zero, many, MetaGrammar.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 @tag("++") El plusmax(final El e) { return new Rep(e, null, false, true, true); }
+ public static @tag("+") El plus(final El e) { return new Rep(e, null, false, true, false); }
+ public static @tag("++/") El plusmaxfollow(final El e, final El sep) { return new Rep(e, sep, false, true, true); }
+ public static @tag("+/") El plusfollow(final El e, final El sep) { return new Rep(e, sep, false, true, false); }
+ public static @tag("**") El starmax(final El e) { return new Rep(e, null, true, true, true); }
+ public static @tag("*") El star(final El e) { return new Rep(e, null, true, true, false); }
+ public static @tag("**/") El starmaxfollow(final El e, final El sep) { return new Rep(e, sep, true, true, true); }
+ public static @tag("*/") El starfollow(final El e, final El sep) { return new Rep(e, sep, true, true, false); }
+ public static @tag("?") El question(final El e) { return new Rep(e, null, true, true, false); }
+
+ public static @tag("!") El bang(final El e) { return new Drop(e); }
+
+ public static @tag("^") El caret(final String s) {
+ return new Drop(new Constant(CharRange.string(s)) {
+ public String getOwnerTag() { return s; }
+ });
+ }
+
+ public static @tag("~") El tilde(final El e) {
+ return new PostProcess(e) {
+ public Element postProcess(Element e) {
+ return MetaGrammar.infer((Topology<Character>)Atom.toAtom(e).complement());
+ } }; }
+
+ public static @tag("^^") void doublecaret(final El e) { throw new Error("not implemented"); }
+
+ //public static @tag("(") El subexpression(Seq[][] rhs) { return new NonTerminal(rhs); }
+
+ public static @tag("Word") String word(String s) { return s; }
+ public static @tag("Quoted") String quoted(String s) { return s; }
+ public static @tag("escaped") String c(char c) { return c+""; }
+ public static @tag("\"\"") String emptystring() { return ""; }
+ public static @tag("\n") String retur() { return "\n"; }
+ public static @tag("\r") String lf() { return "\r"; }
+
}
+ public static class Context {
+ HashMap<String,Union> map = new HashMap<String,Union>();
+ private MG.Grammar grammar;
+ public String cnt = null;
+ private ReflectiveMeta rm;
+ public Context(MG.Grammar g, ReflectiveMeta rm) {
+ this.grammar = g;
+ this.rm = rm;
+ }
+ public Union build() {
+ Union ret = null;
+ for(MG.NonTerminal nt : grammar.nonterminals) {
+ Union u = get(nt.name);
+ if ("s".equals(nt.name))
+ ret = u;
+ }
+ return ret;
+ }
+ public Context(Tree t, ReflectiveMeta rm) {
+ this.rm = rm;
+ Tree.TreeFunctor<Object,Object> red = (Tree.TreeFunctor<Object,Object>)t.head();
+ this.grammar = (MG.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); }
+ public Union get(String name) {
+ Union ret = map.get(name);
+ if (ret != null) return ret;
+ ret = new Union(name);
+ map.put(name, ret);
+ MG.NonTerminal nt = grammar.get(name);
+ if (nt==null) {
+ System.err.println("*** warning could not find " + name);
+ } else {
+ String old = cnt;
+ cnt = name;
+ nt.build(this, ret);
+ cnt = old;
+ }
+ return ret;
+ }
+ }
}
projects / sbp.git / blobdiff