import java.lang.reflect.*;
import java.io.*;
+/** The java classes typically used to represent a parsed grammar AST */
public class MetaGrammarBindings {
- public static @bind class Grammar {
- public NonTerminal get(String s) {
- for(NonTerminal nt : nonterminals)
- if (nt.name.equals(s)) return nt;
- return null;
- }
- public @bind.arg NonTerminal[] nonterminals;
+
+ /** 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 String toString() {
String ret = "[ ";
- for(NonTerminal nt : nonterminals) ret += nt + ", ";
+ for(NonTerminal nt : values()) ret += nt + ", ";
return ret + " ]";
}
}
+
public abstract static class Un extends El {
public Seq[][] sequences;
public void build(MetaGrammar.Context cx, Union u) {
}
}
}
+
public static class NonTerminal extends Un {
+ public boolean rep;
public String name = null;
- public @bind NonTerminal(@bind.arg String name,
- @bind.arg Seq[][] sequences) {
+ 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;
this.sequences = sequences;
+ this.rep = rep;
+ this.sep = 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; }
+ 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));
+
+ for(int i=0; i<sequences.length; i++) {
+ Seq[] group = sequences[i];
+ Union u2 = new Union();
+ 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 });
+ u2.add(s);
+ }
+ if (sequences.length==1) break;
+ Sequence seq = Sequence.singleton(u2);
+ for(Sequence s : bad2) {
+ s.lame = true;
+ seq = seq.not(s);
+ }
+ u.add(seq);
+ bad2.add(Sequence.singleton(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 static @bind.as void range(char c) { }
public static class Range {
- public @bind.as("range") Range(char only) { first = only; last = only; }
- public @bind.as("-") Range(char first, char last) { this.first = first; this.last = last; }
+ 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;
}
El follow;
String tag = null;
boolean lame;
+ public void append(El e) {
+ El[] elements = new El[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; }
Sequence ret = null;
if (dropAll) ret = Sequence.drop(els, false);
else if (unwrap) ret = Sequence.unwrap(els, cx.rm.repeatTag(), drops);
- else if (tag!=null) {
- ret = cx.rm.resolveTag(tag, cx.cnt, els, labels, drops);
- } else {
- ret = cx.rm.tryResolveTag(tag, cx.cnt, els, labels, drops);
+ else {
+ if (tag != null) ret = cx.rm.resolveTag(tag, cx.cnt, els, labels, 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++)
return ret;
}
}
- public static @bind.as("&") Seq and(Seq s, El[] elements) { return s.and(seq(elements)); }
- public static @bind.as("&~") Seq andnot(Seq s, El[] elements) { return s.andnot(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, 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 @bind.as("ps") Seq seq(El[] elements) { return new Seq(elements); }
+ 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 psx(Seq s) { return s; }
public static @bind.as(":") El colon(String s, El 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("nonTerminal") class NonTerminalReference extends El {
+ public static @bind class NonTerminalReference extends El {
public @bind.arg String nonTerminal;
- public Element build(MetaGrammar.Context cx) {
- return cx.get(nonTerminal);
- }
+ public Element build(MetaGrammar.Context cx) { return cx.get(nonTerminal); }
}
- public static class StringLiteral extends Constant {
- public @bind.as("literal") StringLiteral(String string) { super(CharRange.string(string)); }
+ public static class Literal extends Constant {
+ public @bind Literal(@bind.arg String string) { super(CharRange.string(string)); }
public boolean drop() { return true; }
}
public static @bind.as("{") class XTree extends El {
public @bind.arg Seq body;
public Element build(MetaGrammar.Context cx) {
- throw new Error();
+ Union u = new Union();
+ Sequence s = body.build(cx, u, false);
+ Union u2 = new Union();
+ u2.add(Sequence.singleton(new Element[] {
+ CharRange.leftBrace,
+ cx.get("ws"),
+ u,
+ cx.get("ws"),
+ CharRange.rightBrace
+ }, 2));
+ return u2;
}
}
//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("\"\"") String emptystring() { return ""; }
- public static @bind.as("\n") String retur() { return "\n"; }
- public static @bind.as("\r") String lf() { return "\r"; }
+ 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("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)); }
projects / sbp.git / blobdiff