public static void main(String[] s) throws Exception {
Tree<String> res = new CharParser(MetaGrammar.make()).parse(new FileInputStream(s[0])).expand1();
- MetaGrammar.Meta m =
+ ReflectiveMeta m =
new ReflectiveMeta(MG.class,
new Class[] {
MG.Grammar.class,
MG.NonTerminal.class,
+ MG.AnonUn.class,
MG.Range.class,
MG.El.class,
MG.Seq.class,
System.err.println("parsing " + s[1]);
Tree t = new CharParser(meta).parse(new FileInputStream(s[1])).expand1();
+ System.out.println("tree:\n" + t.toPrettyString());
- System.out.println(t.toPrettyString());
Reducer red = (Reducer)t.head();
- System.out.println(red.reduce(t));
+ MG.Grammar g = (MG.Grammar)red.reduce(t);
+ System.out.println(g);
+
+ Context cx = new Context(g,m);
+ Element u = null;
+ for(MG.NonTerminal nt : g.nonterminals) {
+ Union el = (Union)cx.get(nt.name);
+ StringBuffer st = new StringBuffer();
+ el.toString(st);
+ System.err.println(st);
+ if (nt.name.equals("s")) u = el;
+ }
+ System.err.println();
+
+ System.err.println("== parsing with parsed grammar =================================================================================");
+ t = new CharParser((Union)u).parse(new FileInputStream(s[1])).expand1();
+ System.out.println(t.toPrettyString());
+
+ System.err.println("== parsing with parsed-parsed grammar ==========================================================================");
+ t = new CharParser(new Context(t, m).build()).parse(new FileInputStream(s[1])).expand1();
+ System.out.println(t.toPrettyString());
}
public static class ReflectiveMeta extends MetaGrammar.Meta {
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+"\"");
+ throw new RuntimeException("could not find a Java method/class/ctor matching tag \""+tag+"\", nonterminal \""+nonTerminalName+"\" with " + els.length + " arguments");
}
}
/*
public static class MG {
public static @tag("grammar") class Grammar {
+ public NonTerminal get(String s) {
+ for(NonTerminal nt : nonterminals)
+ if (nt.name.equals(s))
+ return nt;
+ return null;
+ }
public @arg("NonTerminal") NonTerminal[] nonterminals;
public String toString() {
String ret = "[ ";
return ret + " ]";
}
}
- public static @nonterminal class NonTerminal extends El {
- public @arg("Word") String name;
- public @arg("RHS") Seq[][] sequences;
- private static int anon = 0;
- public NonTerminal() { }
- public NonTerminal(Seq[][] sequences) {
- this.name = "anon" + (anon++);
+ public abstract static class Un extends El {
+ public Seq[][] sequences;
+ public void build(Context cx, Union u) {
+ HashSet<Sequence> bad2 = new HashSet<Sequence>();
+ 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++) {
+ group[j].build(cx, u2);
+ }
+ 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 class NonTerminal extends Un {
+ public String name = null;
+ public @nonterminal("NonTerminal") NonTerminal(@arg("Word") String name,
+ @arg("RHS") Seq[][] sequences) {
+ this.name = name;
+ this.sequences = sequences;
+ }
+ public Element build(Context cx) { return cx.get(name); }
+ }
+
+ public static class AnonUn extends Un {
+ public @tag("(") AnonUn(Seq[][] sequences) {
this.sequences = sequences;
}
public Element build(Context cx) {
- Element ret = cx.peek(name);
- if (ret != null) return ret;
- Union u = new Union(name);
- cx.put(name, u);
- HashSet<Sequence> bad = new HashSet<Sequence>();
- for(Seq[] group : sequences) {
- Union u2 = new Union(""+anon++);
- HashSet<Sequence> bad2 = new HashSet<Sequence>();
- for(Seq seq : group) {
- Sequence built = seq.build(cx);
- for(Sequence s : bad)
- built = built.not(s);
- u2.add(built);
- bad2.add(built);
- }
- bad.addAll(bad2);
- u.add(Sequence.singleton(u2));
- }
- return u;
+ Union ret = new Union();
+ build(cx, ret);
+ return ret;
}
}
- public static @tag void range(char c) { }
+ //public static @tag void range(char c) { }
public static class Range {
public @tag("range") Range(char only) { first = only; last = only; }
public @tag("-") Range(char first, char last) { this.first = first; this.last = last; }
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(Context cx) { return e.build(cx); }
}
public static class Label extends El {
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(Context cx) { return e.build(cx); }
}
public static /*abstract*/ class Seq {
El[] elements;
El follow;
String tag = null;
+ boolean lame;
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; }
ret.tag = 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 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];
for(int i=0; i<this.elements.length; i++) {
this.elements = elements;
return this;
}
- public Sequence build(Context cx) {
+ public Sequence build(Context cx, Union u) {
+ Sequence ret = build0(cx);
+ for(Seq s : and) { Sequence dork = s.build(cx, u); dork.lame = true; ret = ret.and(dork); }
+ for(Seq s : not) { Sequence dork = s.build(cx, u); dork.lame = true; ret = ret.not(dork); }
+ u.add(ret);
+ return ret;
+ }
+ public Sequence build0(Context cx) {
boolean unwrap = false;
boolean dropAll = false;
if (tag!=null && tag.equals("[]")) unwrap = true;
}
Sequence ret = null;
if (dropAll) ret = Sequence.drop(els, false);
- else if (unwrap) ret = Sequence.unwrap(els, repeatTag(), drops);
+ else if (unwrap) ret = Sequence.unwrap(els, cx.rm.repeatTag(), drops);
else if (tag!=null) {
- //FIXME
- //ret = resolveTag(tag, bc.currentNonTerminal==null ? null : bc.currentNonTerminal.name, els, labels, drops);
- //System.err.println("resolvetag " + tag + " => " + ret);
- ret = Sequence.rewritingSequence(tag, els, labels, drops);
+ ret = cx.rm.resolveTag(tag, cx.cnt, els, labels, drops);
} else {
int idx = -1;
for(int i=0; i<els.length; i++)
}
if (this.follow != null)
ret.follow = MetaGrammar.infer(this.follow.build(cx));
+ ret.lame = this.lame;
return ret;
}
}
public static @tag("nonTerminal") class NonTerminalReference extends El {
public @arg String nonTerminal;
- public Element build(Context cx) { return cx.get(nonTerminal); }
+ public Element build(Context cx) {
+ return cx.get(nonTerminal);
+ }
}
public static class StringLiteral extends Constant {
public @tag("literal") StringLiteral(String string) { super(CharRange.string(string)); }
+ public boolean drop() { return true; }
}
public static class CharClass extends El {
Range[] ranges;
public @tag("[") CharClass(Range[] ranges) { this.ranges = ranges; }
public Element build(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);
+ for(Range r : ranges)
+ set.add(r.first, r.last);
return CharRange.set(set);
}
}
public Rep(El e, El 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(Context cx) {
- return max
- ? Sequence.repeat(e.build(cx), zero, many, sep==null ? null : sep.build(cx), repeatTag())
+ return (!max)
+ ? Sequence.repeat(e.build(cx), zero, many, sep==null ? null : sep.build(cx), cx.rm.repeatTag())
: sep==null
- ? Sequence.repeatMaximal(MetaGrammar.infer(e.build(cx)), zero, many, repeatTag())
- : Sequence.repeatMaximal(e.build(cx), zero, many, MetaGrammar.infer(sep.build(cx)), repeatTag());
+ ? Sequence.repeatMaximal(MetaGrammar.infer(e.build(cx)), zero, many, cx.rm.repeatTag())
+ : Sequence.repeatMaximal(e.build(cx), zero, many, MetaGrammar.infer(sep.build(cx)), cx.rm.repeatTag());
}
}
public static class Constant extends El {
public static @tag("!") El bang(final El e) { return new Drop(e); }
public static @tag("^") El caret(final String s) {
- return new Constant(CharRange.string(s)) {
+ return new Drop(new Constant(CharRange.string(s)) {
public String getOwnerTag() { return s; }
- };
+ });
}
public static @tag("~") El tilde(final El e) {
public static @tag("^^") void doublecaret(final El e) { throw new Error("not implemented"); }
- public static @tag("(") El subexpression(Seq[][] rhs) { return new NonTerminal(rhs); }
+ //public static @tag("(") El subexpression(Seq[][] rhs) { return new NonTerminal(rhs); }
public static @nonterminal("Word") String word(String s) { return s; }
public static @nonterminal("Quoted") String quoted(String s) { return s; }
}
public static class Context {
HashMap<String,Union> map = new HashMap<String,Union>();
+ private MG.Grammar grammar;
+ public String cnt = null;
+ private ReflectiveMeta rm;
+ public Context(MG.Grammar g, ReflectiveMeta rm) {
+ this.grammar = g;
+ this.rm = rm;
+ }
+ public Union build() {
+ Union ret = null;
+ for(MG.NonTerminal nt : grammar.nonterminals) {
+ Union u = get(nt.name);
+ if ("s".equals(nt.name))
+ ret = u;
+ }
+ return ret;
+ }
+ public Context(Tree t, ReflectiveMeta rm) {
+ this.rm = rm;
+ Reducer red = (Reducer)t.head();
+ this.grammar = (MG.Grammar)red.reduce(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) map.put(name, ret = new Union(name));
+ if (ret != null) return ret;
+ ret = new Union(name);
+ map.put(name, ret);
+ MG.NonTerminal nt = grammar.get(name);
+ if (nt==null) {
+ System.err.println("*** warning could not find " + name);
+ } else {
+ String old = cnt;
+ cnt = name;
+ nt.build(this, ret);
+ cnt = old;
+ }
return ret;
}
}
- public static Object repeatTag() { return null; }
}
projects / sbp.git / blobdiff