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();
-
- ReflectiveMeta m =
- new ReflectiveMeta(MG.class,
- new Class[] {
- MG.Grammar.class,
- MG.NonTerminal.class,
- MG.AnonUn.class,
- MG.Range.class,
- MG.El.class,
- MG.Seq.class,
- MG.NonTerminalReference.class,
- MG.StringLiteral.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();
- System.out.println("tree:\n" + t.toPrettyString());
- Reducer red = (Reducer)t.head();
- MG.Grammar g = (MG.Grammar)red.reduce(t);
- System.out.println(g);
-
- Context cx = new Context(g,m);
- Element u = null;
- for(MG.NonTerminal nt : g.nonterminals) {
- 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;
- }
- System.err.println();
+ 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());
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.NonTerminal.class,
+ MG.AnonUn.class,
+ MG.Range.class,
+ MG.El.class,
+ MG.Seq.class,
+ MG.NonTerminalReference.class,
+ MG.StringLiteral.class,
+ MG.Tree.class,
+ MG.CharClass.class
+ });
+ }
public ReflectiveMeta(Class c, Class[] inner) {
this._cl = c;
this._inner = inner;
}
public Object repeatTag() {
return new Reducer() {
- public String toString() { return "[**]"; }
+ public String toString() { return ""; }
public Object reduce(Tree t) {
Object[] ret = new Object[t.numChildren()];
for(int i=0; i<t.numChildren(); i++) {
}
};
}
- 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+"\" with " + els.length + " arguments");
+ 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++)
- }
- };
- }
- */
/**
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();
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;
return o;
}
+ public static Union make(Tree t, String s) {
+ ReflectiveMeta rm = new ReflectiveMeta();
+ Reducer red = (Reducer)t.head();
+ MG.Grammar g = (MG.Grammar)red.reduce(t);
+ Context cx = new Context(g,rm);
+ Union u = null;
+ for(MG.NonTerminal nt : g.nonterminals) {
+ 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 @tag("grammar") class Grammar {
public NonTerminal get(String s) {
Union u2 = new Union();
if (sequences.length==1) u2 = u;
for(int j=0; j<group.length; j++) {
- group[j].build(cx, u2);
+ group[j].build(cx, u2, false);
}
if (sequences.length==1) break;
Sequence seq = Sequence.singleton(u2);
this.elements = elements;
return this;
}
- public Sequence build(Context cx, Union u) {
- Sequence ret = build0(cx);
- for(Seq s : and) { Sequence dork = s.build(cx, u); dork.lame = true; ret = ret.and(dork); }
- for(Seq s : not) { Sequence dork = s.build(cx, u); dork.lame = true; ret = ret.not(dork); }
+ 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) {
+ public Sequence build0(Context cx, boolean lame) {
boolean unwrap = false;
- boolean dropAll = false;
+ boolean dropAll = lame;
if (tag!=null && tag.equals("[]")) unwrap = true;
if (tag!=null && "()".equals(tag)) dropAll = true;
Object[] labels = new Object[elements.length];
projects / sbp.git / blobdiff