+++ /dev/null
-// Copyright 2006 all rights reserved; see LICENSE file for BSD-style license
-
-package edu.berkeley.sbp.meta;
-import edu.berkeley.sbp.util.*;
-import edu.berkeley.sbp.*;
-import edu.berkeley.sbp.chr.*;
-import edu.berkeley.sbp.misc.*;
-import edu.berkeley.sbp.bind.*;
-import java.util.*;
-import java.lang.annotation.*;
-import java.lang.reflect.*;
-import java.io.*;
-
-/** The java classes typically used to represent a parsed grammar AST; each inner class is a type of AST node. */
-public class MetaGrammarBindings extends AnnotationGrammarBindings {
-
- public MetaGrammarBindings() { super(MetaGrammarBindings.class); }
-
- // FIXME ugly ugly ugly scary dangerous
- public static String prefix = "";
-
- /** A grammar (a set of nonterminals) */
- public static class GrammarNode extends HashMap<String,NonTerminalNode> {
- public NonTerminalNode[] getNonTerminals() {
- return (NonTerminalNode[])values().toArray(new NonTerminalNode[0]);
- }
- public GrammarNode(NonTerminalNode[] nonterminals) {
- for(NonTerminalNode nt : nonterminals) {
- if (nt==null) continue;
- if (this.get(nt.name)!=null)
- throw new RuntimeException("duplicate definition of nonterminal \""+nt.name+"\"");
- this.put(nt.name, nt);
- }
- }
- public @bind.as("Grammar") GrammarNode(Object[] nt) { add(nt); }
- private void add(Object[] obs) {
- for(Object o : obs) {
- if (o==null) continue;
- else if (o instanceof Object[]) add((Object[])o);
- else if (o instanceof NonTerminalNode) {
- NonTerminalNode nt = (NonTerminalNode)o;
- if (this.get(nt.name)!=null)
- throw new RuntimeException("duplicate definition of nonterminal \""+nt.name+"\"");
- this.put(nt.name, nt);
- }
- else if (o instanceof GrammarNode) add(((GrammarNode)o).getNonTerminals());
- }
- }
- public String toString() {
- String ret = "[ ";
- for(NonTerminalNode nt : values()) ret += nt + ", ";
- return ret + " ]";
- }
- public Union build(String s, Grammar.Bindings rm) {
- Context cx = new Context(this,rm);
- Union u = null;
- for(MetaGrammarBindings.NonTerminalNode nt : values()) {
- Union el = (Union)cx.get(nt.name);
- StringBuffer st = new StringBuffer();
- el.toString(st);
- if (nt.name.equals(s)) u = el;
- }
- return u;
- }
- }
-
- public abstract static class UnionNode extends ElementNode {
- public Seq[][] sequences;
- public Atom toAtom(Context cx) {
- Atom ret = null;
- for(Seq[] ss : sequences)
- for(Seq s : ss)
- ret = ret==null ? s.toAtom(cx) : (Atom)ret.union(s.toAtom(cx));
- return ret;
- }
- public void build(Context cx, Union u, NonTerminalNode cnt) {
- HashSet<Sequence> bad2 = new HashSet<Sequence>();
- for(int i=0; i<sequences.length; i++) {
- Seq[] group = sequences[i];
- Union u2 = new Union(null, false);
- if (sequences.length==1) u2 = u;
- for(int j=0; j<group.length; j++)
- group[j].build(cx, u2, cnt);
- if (sequences.length==1) break;
- Sequence seq = Sequence.create(u2);
- for(Sequence s : bad2) seq = seq.andnot(s);
- u.add(seq);
- bad2.add(Sequence.create(u2));
- }
- }
- }
-
- public static @bind.as("#import") GrammarNode poundimport(String fileName, String as) {
- if (as==null) as = "";
- else if ("".equals(as)) { }
- else as = as +".";
-
- try {
- Tree t = new CharParser(MetaGrammar.newInstance()).parse(new FileInputStream("tests/"+fileName)).expand1();
- TreeFunctor<Object,Object> red = (TreeFunctor<Object,Object>)t.head();
- String oldprefix = prefix;
- prefix = as;
- GrammarNode gn = (GrammarNode)red.invoke(t);
- prefix = oldprefix;
- return gn;
- } catch (Exception e) {
- e.printStackTrace();
- throw new RuntimeException(e);
- }
- }
-
- public static class NonTerminalNode extends UnionNode {
- public boolean rep;
- public String name = null;
- public String sep = null;
- public NonTerminalNode[] getNonTerminals() { return new NonTerminalNode[] { this }; }
- public @bind.as("NonTerminal") NonTerminalNode(@bind.arg String name, @bind.arg Seq[][] sequences) {
- this(name, sequences, false); }
- public NonTerminalNode(String name, Seq[][] sequences, boolean rep) { this(name, sequences, rep, null); }
- public NonTerminalNode(String name, Seq[][] sequences, boolean rep, String sep) {
- this.name = prefix + name;
- this.sequences = sequences;
- this.rep = rep;
- this.sep = sep==null?null:(prefix + sep);
- }
- public Element build(Context cx, NonTerminalNode cnt) { return cx.get(name); }
- public void build(Context cx, Union u, NonTerminalNode cnt) {
- if (!rep) { super.build(cx, u, this); return; }
- HashSet<Sequence> bad2 = new HashSet<Sequence>();
-
- Union urep = new Union(null, false);
- urep.add(Sequence.create());
- if (sep != null)
- urep.add(Sequence.create(new Element[] { cx.get(sep), u }, 1));
- else
- urep.add(Sequence.create(new Element[] { u }, 0));
-
- for(int i=0; i<sequences.length; i++) {
- Seq[] group = sequences[i];
- Union u2 = new Union(null, false);
- if (sequences.length==1) u2 = u;
- for(int j=0; j<group.length; j++) {
- Union u3 = new Union(null, false);
- group[j].build(cx, u3, this);
- Sequence s = Sequence.create(cx.rm.repeatTag(),
- new Element[] { u3, urep },
- new boolean[] { false, false },
- true);
- u2.add(s);
- }
- if (sequences.length==1) break;
- Sequence seq = Sequence.create(u2);
- for(Sequence s : bad2) seq = seq.andnot(s);
- u.add(seq);
- bad2.add(Sequence.create(u2));
- }
- }
- }
-
- public static @bind.as("=") NonTerminalNode go(@bind.arg String name, @bind.arg Seq[][] sequences) {
- return new NonTerminalNode(name, sequences, true); }
- public static @bind.as("=") NonTerminalNode go(@bind.arg String name, @bind.arg String sep, @bind.arg Seq[][] sequences) {
- return new NonTerminalNode(name, sequences, true, sep); }
-
- public static class AnonUnionNode extends UnionNode {
- public @bind.as("(") AnonUnionNode(Seq[][] sequences) {
- this.sequences = sequences;
- }
- public Element build(Context cx, NonTerminalNode cnt) {
- Union ret = new Union(null, false);
- build(cx, ret, cnt);
- return ret;
- }
- }
-
- public static class Range {
- public @bind Range(char only) { first = only; last = only; }
- public @bind Range(char first, char last) { this.first = first; this.last = last; }
- public char first;
- public char last;
- }
-
- public static /*abstract*/ class Seq {
- HashSet<Seq> and = new HashSet<Seq>();
- HashSet<Seq> not = new HashSet<Seq>();
- ElementNode[] elements;
- ElementNode follow;
- String tag = null;
- public void append(ElementNode e) {
- ElementNode[] elements = new ElementNode[this.elements.length+1];
- System.arraycopy(this.elements, 0, elements, 0, this.elements.length);
- this.elements = elements;
- elements[elements.length-1] = e;
- }
- public Seq(ElementNode e) { this(new ElementNode[] { e }); }
- public Seq(ElementNode[] elements) { this.elements = elements; }
- public Atom toAtom(Context cx) {
- if (elements.length != 1) throw new Error("you attempted to use ->, **, ++, or a similar character-class operator on a [potentially] multicharacter production");
- return elements[0].toAtom(cx);
- }
- public Seq tag(String tag) { this.tag = prefix+tag; return this; }
- public Seq follow(ElementNode 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 = prefix+tag;
- return ret;
- }
- public Seq and(Seq s) { and.add(s); return this; }
- public Seq andnot(Seq s) { not.add(s); return this; }
- public Seq separate(ElementNode sep) {
- ElementNode[] elements = new ElementNode[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, NonTerminalNode cnt) {
- Sequence ret = build0(cx, cnt);
- for(Seq s : and) { Sequence dork = s.build(cx, null, cnt); ret = ret.and(dork); }
- for(Seq s : not) { Sequence dork = s.build(cx, null, cnt); ret = ret.andnot(dork); }
- if (u!=null) u.add(ret);
- return ret;
- }
- public Sequence build0(Context cx, NonTerminalNode cnt) {
- boolean[] drops = new boolean[elements.length];
- Element[] els = new Element[elements.length];
- for(int i=0; i<elements.length; i++) {
- drops[i] = elements[i].drop();
- els[i] = elements[i].build(cx, cnt);
- if (elements[i].getOwnerTag() != null)
- tag = elements[i].getOwnerTag();
- }
- Sequence ret = null;
- Production prod = new Production(tag, (cnt==null?null:cnt.name), els, drops);
- ret = cx.rm.createSequence(prod);
- 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.create(els, null));
- if (idx != -1) ret = Sequence.create(els, idx);
- else ret = Sequence.create(els, null);
- }
- if (this.follow != null)
- ret = ret.followedBy(this.follow.toAtom(cx));
- return ret;
- }
- }
- public static @bind.as("&") Seq and2(Seq s, Seq a) { return s.and(a); }
- public static @bind.as("&~") Seq andnot2(Seq s, Seq a) { return s.andnot(a); }
- public static @bind.as("->") Seq arrow(Seq s, ElementNode 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, ElementNode e) { return s.separate(e); }
-
- public static Seq seq(ElementNode[] elements) { return new Seq(elements); }
- public static @bind.as("Elements") Seq seq2(ElementNode[] elements) { return new Seq(elements); }
- public static @bind.as Seq psx(Seq s) { return s; }
- public static @bind.as(":") ElementNode colon(String s, ElementNode e) { return new Label(s, e); }
- public static @bind.as(")") void close(String foo) { throw new Error("not supported"); }
- public static @bind.as("()") ElementNode epsilon() { return new Constant(epsilon); }
-
- private static Union epsilon = new Union("()");
- static { epsilon.add(Sequence.create()); }
-
- public static class NonTerminalReferenceNode extends ElementNode {
- public String nonTerminal;
- public NonTerminalReferenceNode() { }
- public @bind.as("NonTerminalReference") NonTerminalReferenceNode(String nonTerminal) {
- this.nonTerminal = prefix + nonTerminal;
- }
- public Atom toAtom(Context cx) {
- return cx.grammar.get(nonTerminal).toAtom(cx);
- }
- public Element build(Context cx, NonTerminalNode cnt) {
- if (!this.nonTerminal.startsWith(prefix)) nonTerminal = prefix + nonTerminal;
- Element ret = cx.get(nonTerminal);
- if (ret == null) throw new RuntimeException("unknown nonterminal \""+nonTerminal+"\"");
- return ret;
- }
- }
-
- public static class Literal extends Constant {
- private String string;
- public @bind Literal(@bind.arg String string) {
- super(CharAtom.string(string));
- this.string = string;
- }
- public boolean drop() { return true; }
- public Atom toAtom(Context cx) {
- if (string.length()!=1) return super.toAtom(cx);
- edu.berkeley.sbp.util.Range.Set set = new edu.berkeley.sbp.util.Range.Set();
- set.add(string.charAt(0), string.charAt(0));
- return CharAtom.set(set);
- }
- }
-
- public static class CharClass extends ElementNode {
- Range[] ranges;
- public @bind.as("[") CharClass(Range[] ranges) { this.ranges = ranges; }
- public Atom toAtom(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 CharAtom.set(set);
- }
- public Element build(Context cx, NonTerminalNode cnt) {
- 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 CharAtom.set(set);
- }
- }
-
- public static @bind.as("\\{") ElementNode leftBrace() {
- return new Drop(new CharClass(new Range[] { new Range(CharAtom.left, CharAtom.left) })); }
- public static @bind.as("\\}") ElementNode rightBrace() {
- return new Drop(new CharClass(new Range[] { new Range(CharAtom.right, CharAtom.right) })); }
-
- public static @bind.as("{") class XTree extends ElementNode {
- public @bind.arg Seq body;
- public Element build(Context cx, NonTerminalNode cnt) {
- Union u = new Union(null, false);
- Sequence s = body.build(cx, u, null);
- Union u2 = new Union(null, false);
- u2.add(Sequence.create(new Element[] {
- CharAtom.leftBrace,
- cx.get("ws"),
- u,
- cx.get("ws"),
- CharAtom.rightBrace
- }, 2));
- return u2;
- }
- }
-
- public static class Rep extends ElementNode {
- public ElementNode e, sep;
- public boolean zero, many, max;
- public Rep(ElementNode e, ElementNode sep, boolean zero, boolean many, boolean max) {
- this.e = e; this.sep = sep; this.zero = zero; this.many = many; this.max = max;}
- public Atom toAtom(Context cx) {
- if (sep != null) return super.toAtom(cx);
- return e.toAtom(cx);
- }
- public Element build(Context cx, NonTerminalNode cnt) {
- return (!max)
- ? Repeat.repeat(e.build(cx, null), zero, many, sep==null ? null : sep.build(cx, null), cx.rm.repeatTag())
- : sep==null
- ? Repeat.repeatMaximal(e.toAtom(cx), zero, many, cx.rm.repeatTag())
- : Repeat.repeatMaximal(e.build(cx, null), zero, many, sep.toAtom(cx), cx.rm.repeatTag());
- }
- }
-
- // FIXME: it would be nice if we could hoist this into "Rep"
- public static @bind.as("++") ElementNode plusmax(final ElementNode e)
- { return new Rep(e, null, false, true, true); }
- public static @bind.as("+") ElementNode plus(final ElementNode e)
- { return new Rep(e, null, false, true, false); }
- public static @bind.as("++/") ElementNode plusmaxfollow(final ElementNode e, final ElementNode sep)
- { return new Rep(e, sep, false, true, true); }
- public static @bind.as("+/") ElementNode plusfollow(final ElementNode e, final ElementNode sep)
- { return new Rep(e, sep, false, true, false); }
- public static @bind.as("**") ElementNode starmax(final ElementNode e)
- { return new Rep(e, null, true, true, true); }
- public static @bind.as("*") ElementNode star(final ElementNode e)
- { return new Rep(e, null, true, true, false); }
- public static @bind.as("**/") ElementNode starmaxfollow(final ElementNode e, final ElementNode sep)
- { return new Rep(e, sep, true, true, true); }
- public static @bind.as("*/") ElementNode starfollow(final ElementNode e, final ElementNode sep)
- { return new Rep(e, sep, true, true, false); }
- public static @bind.as("?") ElementNode question(final ElementNode e)
- { return new Rep(e, null, true, true, false); }
- public static @bind.as("!") ElementNode bang(final ElementNode e)
- { return new Drop(e); }
-
- public static @bind.as("^") ElementNode caret(final String s) {
- final String thePrefix = prefix;
- return new Constant(CharAtom.string(s)) {
- public String getOwnerTag() { return thePrefix+s; }
- public boolean drop() { return true; }
- };
- }
-
- public static @bind.as("~") ElementNode tilde(final ElementNode e) {
- return new ElementNodeWrapper(e) {
- public Atom toAtom(Context cx) {
- return infer((Topology<Character>)e.toAtom(cx).complement()/*.minus(CharAtom.braces)*/);
- }
- public Element build(Context cx, NonTerminalNode cnt) {
- return infer((Topology<Character>)e.toAtom(cx).complement()/*.minus(CharAtom.braces)*/);
- } }; }
-
- 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) {
- if (c=='{') return CharAtom.left+"";
- if (c=='}') return CharAtom.right+"";
- return c+"";
- }
- public static @bind.as("EmptyString") String emptystring() { return ""; }
- public static @bind.as("\n") String retur() { return "\n"; }
- public static @bind.as("\r") String lf() { return "\r"; }
-
- //static Atom infer(Element e) { return infer((Topology<Character>)Atom.toAtom(e)); }
- static Atom infer(Object t) { return (Atom)t; }
-
- public static class Context {
- public HashMap<String,Union> map = new HashMap<String,Union>();
- public GrammarNode grammar;
- public String cnt = null;
- public Grammar.Bindings rm;
- public Context(GrammarNode g, Grammar.Bindings rm) {
- this.grammar = g;
- this.rm = rm;
- }
- public Union build() {
- Union ret = null;
- for(NonTerminalNode nt : grammar.values()) {
- Union u = get(nt.name);
- if ("s".equals(nt.name))
- ret = u;
- }
- return ret;
- }
- public Context(Tree t, Grammar.Bindings rm) {
- this.rm = rm;
- TreeFunctor<Object,Object> red = (TreeFunctor<Object,Object>)t.head();
- this.grammar = (GrammarNode)red.invoke(t);
- }
- 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);
- NonTerminalNode nt = grammar.get(name);
- if (nt==null) {
- throw new Error("warning could not find " + name);
- } else {
- String old = cnt;
- cnt = name;
- nt.build(this, ret, nt);
- cnt = old;
- }
- return ret;
- }
-
- }
-
- public static abstract class ElementNode {
- public String getLabel() { return null; }
- public String getOwnerTag() { return null; }
- public boolean drop() { return false; }
- public Atom toAtom(Context cx) { throw new Error("can't convert a " + this.getClass().getName() + " to an atom"); }
- public abstract Element build(Context cx, NonTerminalNode cnt);
- }
-
- public static abstract class ElementNodeWrapper extends ElementNode {
- protected ElementNode _e;
- public ElementNodeWrapper(ElementNode e) { this._e = e; }
- public String getLabel() { return _e.getLabel(); }
- public String getOwnerTag() { return _e.getOwnerTag(); }
- public boolean drop() { return _e.drop(); }
- public Atom toAtom(Context cx) { return _e.toAtom(cx); }
- public Element build(Context cx, NonTerminalNode cnt) { return _e.build(cx, cnt); }
- }
-
- public static class Constant extends ElementNode {
- Element constant;
- public Constant(Element constant) { this.constant = constant; }
- public Element build(Context cx, NonTerminalNode cnt) { return constant; }
- public Atom toAtom(Context cx) {
- if (constant instanceof Atom) return ((Atom)constant);
- return super.toAtom(cx);
- }
- }
-
- public abstract static class PostProcess extends ElementNodeWrapper {
- public PostProcess(ElementNode e) { super(e); }
- public Element build(Context cx, NonTerminalNode cnt) { return postProcess(_e.build(cx, cnt)); }
- public abstract Element postProcess(Element e);
- }
-
- public static class Drop extends ElementNodeWrapper {
- public Drop(ElementNode e) { super(e); }
- public boolean drop() { return true; }
- }
-
- public static class Label extends ElementNodeWrapper {
- public String label;
- public Label(String label, ElementNode e) { super(e); this.label = label; }
- public String getLabel() { return label; }
- }
-
- /*
- static class Invert extends Atom {
- private final Atom a;
- public Invert(Atom a) { this.a = a; }
- public Topology top() { return a.complement(); }
- public String toString() { return "~"+a; }
- }
- */
-}
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