+// Copyright 2006 all rights reserved; see LICENSE file for BSD-style license
+
package edu.berkeley.sbp.misc;
-import edu.berkeley.sbp.util.*;
+
import edu.berkeley.sbp.*;
import edu.berkeley.sbp.chr.*;
+import edu.berkeley.sbp.misc.*;
+import edu.berkeley.sbp.meta.*;
+import edu.berkeley.sbp.util.*;
import java.util.*;
-import java.lang.annotation.*;
-import java.lang.reflect.*;
import java.io.*;
public class Demo {
- public static void main(String[] s) throws Exception {
- 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]);
- res = new CharParser(meta).parse(new FileInputStream(s[1])).expand1();
-
- System.out.println(res);
- }
-
- public static class ReflectiveMeta extends MetaGrammar.Meta {
- private final Class _cl;
- private final Class[] _inner;
- public ReflectiveMeta(Class c, Class[] inner) {
- this._cl = c;
- this._inner = inner;
- }
- private boolean match(Method m, String s) { return match(m.getAnnotation(tag.class), null, s); }
- private boolean match(tag 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(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;
- 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;
- return false;
- }
- public Sequence resolveTag(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))
- return new TargetMethod(m).makeSequence(p);
- for(Class c : _inner)
- for(Constructor con : c.getConstructors())
- if (new TargetConstructor(con).isCompatible(p))
- return new TargetConstructor(con).makeSequence(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+"\"");
- }
- }
/*
- 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++)
- }
- };
- }
- */
-
-
- /**
- * Constructors, classes, and methods with this attribute will
- * match every production of the nonterminal called "value()"
- * 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 ""; }
-
- /**
- * Constructors, classes, and methods with this attribute will
- * match every tree tagged with "value()" that is arg-compatible.
- * If value() is undefined, then the class/constructor/method
- * name is used.
- */
- @Retention(RetentionPolicy.RUNTIME) public static @interface tag { String value() default ""; }
+ // our grammar class
+ public static class Math {
- /**
- * If any parameter to a method or field in a class has a named
- * arg-tag, that parameter/field matches the child of the tree
- * which either has that label or else is a reference to a
- * nonterminal with the corresponding name.
- *
- * The remaining non-named arg-tags match the remaining children
- * of the tree in sequential order.
- *
- * If any arg-tagged parameters/fields remain, the match fails.
- * If there were no arg-tagged parameters-fields, it is as if all
- * of them were non-named and arg-tagged.
- *
- * A method/constructor is arg-compatible if all of its arguments
- * are arg-compatible.
- *
- * A class is arg-compatible if all of its fields are
- * arg-compatible, or if one of its constructors is arg-compatible.
- *
- */
- @Retention(RetentionPolicy.RUNTIME) public static @interface arg { String value() default ""; }
+ public static @bind.as("(") Expr parenthesis(Expr e) { return e; }
+ public static class Expr implements Reflection.Show { }
- public static class Production {
- public String tag;
- public String nonTerminal;
- public Object[] labels;
- public boolean[] drops;
- public Element[] elements;
- 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.nonTerminal = nonTerminal;
- this.labels = labels;
- this.drops = drops;
- for(int i=0; i<drops.length; i++)
- if (!drops[i])
- count++;
+ public static @bind.as("Expr") class Numeric extends Expr {
+ public @bind.arg String numeric;
}
- }
-
- public static abstract class Target {
- public abstract String getName();
- public abstract tag getTag();
- public abstract nonterminal getNonTerminal();
- public abstract boolean buildSequence(Production p);
- public abstract Sequence makeSequence(Production p);
- public boolean isCompatible(Production p) {
- tag t = getTag();
- if (t != null &&
- (t.value().equals(p.tag) ||
- (t.value().equals("") && p.tag.equals(getName()))))
- return buildSequence(p);
-
- nonterminal n = getNonTerminal();
- if (n != null &&
- (n.value().equals(p.nonTerminal) ||
- (n.value().equals("") && p.nonTerminal.equals(getName()))))
- return buildSequence(p);
- return false;
+ public static class BinOp extends Expr {
+ public @bind.arg Expr left;
+ public @bind.arg Expr right;
}
- public int[] buildSequence(Production p, String[] names, arg[] argtags) {
- int argTagged = 0;
- for(int i=0; i<argtags.length; i++)
- if (argtags[i] != 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) {
- int[] ret = new int[argTagged];
- int j = 0;
- for(int i=0; i<argtags.length; i++)
- if (argtags[i]!=null)
- ret[j++] = i;
- return ret;
- } else {
- return null;
- }
- }
- }
- 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 boolean buildSequence(Production p) {
- Field[] f = _class.getDeclaredFields();
- String[] names = new String[f.length];
- arg[] argtags = new arg[f.length];
- for(int i=0; i<f.length; i++) {
- names[i] = f[i].getName();
- argtags[i] = f[i].getAnnotation(arg.class);
- }
- int[] ret = buildSequence(p, names, argtags);
- if (ret!=null) return true;
- for(Constructor c : _class.getConstructors())
- if (new TargetConstructor(c).buildSequence(p))
- return true;
- return false;
- }
- public Sequence makeSequence(Production p) {
- return Sequence.rewritingSequence(_class, p.elements, p.labels, p.drops);
- }
- }
- 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 boolean buildSequence(Production p) {
- Annotation[][] annotations = _ctor.getParameterAnnotations();
- int len = annotations.length;
- int ofs = 0;
- String name = _ctor.getDeclaringClass().getName();
- if (name.indexOf('$') > name.lastIndexOf('.')) {
- len--;
- ofs++;
- }
- String[] names = new String[len];
- arg[] argtags = new arg[len];
- for(int i=0; i<names.length; i++)
- for(Annotation a : annotations[i+ofs])
- if (a instanceof arg)
- argtags[i+ofs] = (arg)a;
- int[] ret = buildSequence(p, names, argtags);
- if (ret!=null) return true;
- return false;
- }
- public Sequence makeSequence(Production p) {
- return Sequence.rewritingSequence(_ctor, p.elements, p.labels, p.drops);
- }
- }
- public static class TargetMethod extends Target {
- public final Method _method;
- public TargetMethod(Method _method) { this._method = _method; }
- public String getName() { return _method.getName(); }
- public tag getTag() { return (tag)_method.getAnnotation(tag.class); }
- public nonterminal getNonTerminal() { return (nonterminal)_method.getAnnotation(nonterminal.class); }
- public boolean buildSequence(Production p) {
- Annotation[][] annotations = _method.getParameterAnnotations();
- String[] names = new String[annotations.length];
- arg[] argtags = new arg[annotations.length];
- for(int i=0; i<names.length; i++)
- for(Annotation a : annotations[i])
- if (a instanceof arg)
- argtags[i] = (arg)a;
- int[] ret = buildSequence(p, names, argtags);
- if (ret!=null) return true;
- return false;
- }
- public Sequence makeSequence(Production p) {
- return Sequence.rewritingSequence(_method, p.elements, p.labels, p.drops);
- }
+ public static @bind.as("*") class Multiply extends BinOp { }
+ public static @bind.as("/") class Divide extends BinOp { }
+ public static @bind.as("+") class Add extends BinOp { }
+ public static @bind.as("-") class Subtract extends BinOp { }
}
- public class MG {
- public @tag void grammar(Grammar g) { }
- public @nonterminal void Grammar(NonTerminal[] n) { }
- public @nonterminal class Grammar {
- public @arg("NonTerminal") NonTerminal[] nonterminals;
- }
- public @nonterminal class NonTerminal {
- public @arg("Word") String name;
- public @arg("RHS") Seq[][] sequences;
- }
- public @tag void range(char c) { }
- public @nonterminal class Range {
- public @tag("range") Range(char only) { first = only; last = only; }
- public @arg char first;
- public @arg char last;
- }
- public class El { }
- public abstract @nonterminal("Sequence") class Seq { }
- public @tag("&") Seq and(Sequence s, Element[] elements) { return null; }
- public @tag("&~") Seq andnot(Sequence s, Element[] elements) { return null; }
- public @tag Seq ps(Element[] elements) { return null; }
- public @tag("::") Seq tag(String tagname, Seq seq) { return null; }
- public @tag(":") void colon(String s, Element e) { }
- public @tag(")") void close(String foo) { }
- public @tag("/") Seq slash(Seq s, Element e) { return null; }
- public @tag("->") Seq arrow(Seq s, Element e) { return null; }
+ // invoke "java -jar edu.berkeley.sbp.jar edu.berkeley.sbp.misc.Demo tests/demo.g <expr>"
+ public static void main(String[] s) throws Exception {
- public @tag("nonTerminal") class NonTerminalReference { public @arg String nonTerminal; }
- public @tag("literal") class StringLiteral { public @arg String string; }
- public @tag("()") class Epsilon { }
- public @tag("{") class Tree { @arg Seq body; }
- public @tag("[") class CharClass { public CharClass(Range[] ranges) { } }
+ Parser metaGrammarParser = new CharParser(MetaGrammar.newInstance());
+ Tree<String> parsedGrammar = metaGrammarParser.parse(new CharInput(new FileInputStream(s[0]))).expand1();
+ Grammar.Bindings gbr = new AnnotationGrammarBindings(Math.class);
+ Union mathGrammar = Grammar.create(parsedGrammar, "Expr", gbr);
+ Parser mathParser = new CharParser(mathGrammar);
- public @tag("++") void plusmax(El e) { }
- public @tag("+") void plus(El e) { }
- public @tag("++/") void plusmaxfollow(El e, El sep) { }
- public @tag("+/") void plusfollow(El e, El sep) { }
- public @tag("**") void starmax(El e) { }
- public @tag("*") void star(El e) { }
- public @tag("**/") void starmaxfollow(El e, El sep) { }
- public @tag("*/") void starfollow(El e, El sep) { }
- public @tag("!") void bang(El e) { }
- public @tag("?") void question(El e) { }
- public @tag("^") void caret(String s) { }
- public @tag("~") void tilde(El e) { }
- public @tag("^^") void doublecaret(El e) { }
- public @tag("(") void subexpression(Seq[][] rhs) { }
+ System.out.println("about to parse: \""+s[1]+"\"");
+ Tree tree = mathParser.parse(new CharInput(new StringReader(s[1]))).expand1();
- public @nonterminal("Word") String word(String s) { return null; }
- public @nonterminal("Quoted") String quoted(String s) { return null; }
- public @nonterminal("escaped") String c(char c) { return null; }
- public @tag("\"\"") String emptystring() { return null; }
- public @tag("\r") String lf() { return null; }
- public @tag("\n") String cr() { return null; }
- }
+ // below is ugly voodoo which will go away very soon. ignore it.
+ TreeFunctor tf = (TreeFunctor)tree.head();
+ Math.Expr e = (Math.Expr)tf.invoke(tree);
+ // above is ugly voodoo which will go away very soon. ignore it.
+ System.out.println("done!");
+ System.out.println(Reflection.show(e));
+ }
+ */
}
projects / sbp.git / blobdiff