+// 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.*;
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();
+ 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, cnt);
- }
+ 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));
}
}
}
if (!rep) { super.build(cx, u, this); return; }
HashSet<Sequence> bad2 = new HashSet<Sequence>();
- Union urep = new Union();
- urep.add(Sequence.empty);
+ Union urep = new Union(null, false);
+ urep.add(Sequence.create());
if (sep != null)
- urep.add(Sequence.singleton(new Element[] { cx.get(sep), u }, 1));
+ urep.add(Sequence.create(new Element[] { cx.get(sep), u }, 1));
else
- urep.add(Sequence.singleton(new Element[] { u }, 0));
+ 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, this);
- 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));
}
}
}
this.sequences = sequences;
}
public Element build(Context cx, NonTerminalNode cnt) {
- Union ret = new Union();
+ Union ret = new Union(null, false);
build(cx, ret, cnt);
return ret;
}
ElementNode[] elements;
ElementNode follow;
String tag = null;
- boolean lame;
public void append(ElementNode e) {
ElementNode[] elements = new ElementNode[this.elements.length+1];
System.arraycopy(this.elements, 0, elements, 0, this.elements.length);
}
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 follow(ElementNode follow) {
+ this.follow = follow;
+ return this;
+ }
public Seq dup() {
Seq ret = new Seq(elements);
ret.and.addAll(and);
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 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++) {
this.elements = elements;
return this;
}
- public Sequence build(Context cx, Union u, boolean lame, NonTerminalNode cnt) {
- Sequence ret = build0(cx, lame || this.lame, cnt);
- for(Seq s : and) { Sequence dork = s.build(cx, u, true, cnt); ret = ret.and(dork); }
- for(Seq s : not) { Sequence dork = s.build(cx, u, true, cnt); 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(Context cx, boolean lame, NonTerminalNode cnt) {
- boolean dropAll = lame;
- if (tag!=null && tag.endsWith("()")) dropAll = true;
+ 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++) {
tag = elements[i].getOwnerTag();
}
Sequence ret = null;
- if (dropAll) ret = Sequence.drop(els, false);
- else {
- 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.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, null));
- 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, 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 @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(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 class NonTerminalReferenceNode extends ElementNode {
public String nonTerminal;
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);
}
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 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 CharRange.set(set);
+ 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();
- Sequence s = body.build(cx, u, false, null);
- Union u2 = new Union();
- u2.add(Sequence.singleton(new Element[] {
- CharRange.leftBrace,
+ 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 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)
- ? Sequence.repeat(e.build(cx, null), zero, many, sep==null ? null : sep.build(cx, null), 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, null)), zero, many, cx.rm.repeatTag())
- : Sequence.repeatMaximal(e.build(cx, null), zero, many, infer(sep.build(cx, null)), 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 @bind.as("^") ElementNode caret(final String s) {
final String thePrefix = prefix;
- return new Constant(CharRange.string(s)) {
+ 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 PostProcess(e) {
- public Element postProcess(Element e) {
- return infer((Topology<Character>)Atom.toAtom(e).complement().minus(CharRange.braces));
+ 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) { 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 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 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); }
}
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 {
- ElementNode e;
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 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