+// 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 java.lang.reflect.*;
import java.io.*;
-/** The java classes typically used to represent a parsed grammar AST */
-public class MetaGrammarBindings {
+/** 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 Grammar extends HashMap<String,NonTerminal> {
- public @bind Grammar(NonTerminal[] nonterminals) {
- for(NonTerminal nt : nonterminals) this.put(nt.name, nt); }
+ 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(NonTerminal nt : values()) ret += nt + ", ";
+ 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 Un extends El {
+ public abstract static class UnionNode extends ElementNode {
public Seq[][] sequences;
- public void build(MetaGrammar.Context cx, Union u) {
+ 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();
+ 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, false);
- }
+ for(int j=0; j<group.length; j++)
+ group[j].build(cx, u2, cnt);
if (sequences.length==1) break;
- Sequence seq = Sequence.singleton(u2);
- for(Sequence s : bad2) {
- s.lame = true;
- seq = seq.not(s);
- }
+ Sequence seq = Sequence.create(u2);
+ for(Sequence s : bad2) seq = seq.andnot(s);
u.add(seq);
- bad2.add(Sequence.singleton(u2));
+ bad2.add(Sequence.create(u2));
}
}
}
- public static class NonTerminal extends Un {
+ 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 @bind NonTerminal(@bind.arg String name, @bind.arg Seq[][] sequences) { this(name, sequences, false); }
- public NonTerminal(String name, Seq[][] sequences, boolean rep) { this(name, sequences, rep, null); }
- public NonTerminal(String name, Seq[][] sequences, boolean rep, String sep) {
- this.name = name;
+ 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;
+ this.sep = sep==null?null:(prefix + sep);
}
- public Element build(MetaGrammar.Context cx) { return cx.get(name); }
- public void build(MetaGrammar.Context cx, Union u) {
- if (!rep) { super.build(cx, u); return; }
+ 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();
- urep.add(Sequence.empty);
- urep.add(Sequence.singleton(new Element[] { cx.get(sep), u }, 1));
+ 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();
+ Union u2 = new Union(null, false);
if (sequences.length==1) u2 = u;
for(int j=0; j<group.length; j++) {
- Union u3 = new Union();
- group[j].build(cx, u3, false);
- Sequence s = Sequence.unwrap(new Element[] { u3, urep },
- cx.rm.repeatTag(),
- new boolean[] { false, false });
+ 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.singleton(u2);
- for(Sequence s : bad2) {
- s.lame = true;
- seq = seq.not(s);
- }
+ Sequence seq = Sequence.create(u2);
+ for(Sequence s : bad2) seq = seq.andnot(s);
u.add(seq);
- bad2.add(Sequence.singleton(u2));
+ bad2.add(Sequence.create(u2));
}
}
}
- public static @bind.as("=") NonTerminal go(@bind.arg String name, @bind.arg Seq[][] sequences) { return new NonTerminal(name, sequences, true); }
- public static @bind.as("=") NonTerminal go(@bind.arg String name, @bind.arg String sep, @bind.arg Seq[][] sequences) {
- return new NonTerminal(name, sequences, true, sep);
- }
- public static class AnonUn extends Un {
- public @bind.as("(") AnonUn(Seq[][] sequences) {
+ 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(MetaGrammar.Context cx) {
- Union ret = new Union();
- build(cx, ret);
+ public Element build(Context cx, NonTerminalNode cnt) {
+ Union ret = new Union(null, false);
+ build(cx, ret, cnt);
return ret;
}
}
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(MetaGrammar.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(MetaGrammar.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(MetaGrammar.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;
+ ElementNode[] elements;
+ ElementNode follow;
String tag = null;
- boolean lame;
- public void append(El e) {
- El[] elements = new El[this.elements.length+1];
+ 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(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(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 = tag;
+ ret.tag = prefix+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];
+ 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)
this.elements = elements;
return this;
}
- public Sequence build(MetaGrammar.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;
+ 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(MetaGrammar.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];
+ 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++) {
- labels[i] = elements[i].getLabel();
drops[i] = elements[i].drop();
- els[i] = elements[i].build(cx);
+ els[i] = elements[i].build(cx, cnt);
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 {
- 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);
- }
+ 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.follow = infer(this.follow.build(cx));
- ret.lame = this.lame;
+ 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, 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 Seq seq(El[] elements) { return new Seq(elements); }
- public static @bind.as("Elements") Seq seq2(El[] elements) { return new Seq(elements); }
+ 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(":") El colon(String s, El e) { return new Label(s, e); }
+ 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("()") El epsilon() { return new Constant(Union.epsilon); }
+ public static @bind.as("()") ElementNode epsilon() { return new Constant(epsilon); }
+
+ private static Union epsilon = new Union("()");
+ static { epsilon.add(Sequence.create()); }
- public static @bind class NonTerminalReference extends El {
- public @bind.arg String nonTerminal;
- public Element build(MetaGrammar.Context cx) { return cx.get(nonTerminal); }
+ 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 {
- public @bind Literal(@bind.arg String string) { super(CharRange.string(string)); }
+ 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 El {
+ public static class CharClass extends ElementNode {
Range[] ranges;
public @bind.as("[") CharClass(Range[] ranges) { this.ranges = ranges; }
- public Element build(MetaGrammar.Context cx) {
+ 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 CharRange.set(set);
+ return CharAtom.set(set);
}
}
- public static @bind.as("{") class XTree extends El {
+ 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(MetaGrammar.Context cx) {
- Union u = new Union();
- Sequence s = body.build(cx, u, false);
- Union u2 = new Union();
- u2.add(Sequence.singleton(new Element[] {
- CharRange.leftBrace,
+ 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"),
- CharRange.rightBrace
+ CharAtom.rightBrace
}, 2));
return u2;
}
}
- public static class Rep extends El {
- public El e, sep;
+ public static class Rep extends ElementNode {
+ public ElementNode e, sep;
public boolean zero, many, max;
- public Rep(El e, El sep, boolean zero, boolean many, boolean 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 Element build(MetaGrammar.Context cx) {
+ 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)
- ? Sequence.repeat(e.build(cx), zero, many, sep==null ? null : sep.build(cx), cx.rm.repeatTag())
+ ? Repeat.repeat(e.build(cx, null), zero, many, sep==null ? null : sep.build(cx, null), 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());
+ ? Repeat.repeatMaximal(e.toAtom(cx), zero, many, cx.rm.repeatTag())
+ : Repeat.repeatMaximal(e.build(cx, null), zero, many, sep.toAtom(cx), cx.rm.repeatTag());
}
}
- public static class Constant extends El {
- Element constant;
- public Constant(Element constant) { this.constant = constant; }
- public Element build(MetaGrammar.Context cx) { return constant; }
- }
- public abstract static class PostProcess extends El {
- El e;
- public PostProcess(El e) { this.e = e; }
- public Element build(MetaGrammar.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("++") 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("~") 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("~") 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("^^") 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("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(Topology<Character> t) { return new CharRange(new CharTopology(t)); }
+ //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; }
+ }
+ */
}
projects / sbp.git / blobdiff