return new GrammarAST(resolver, "").buildGrammar(grammarAST, startingNonterminal);
}
+ public static void emitCode(PrintWriter pw, Tree grammarAST, String startingNonterminal, ImportResolver resolver) {
+ GrammarAST ga = new GrammarAST(resolver, "");
+ Object o = ga.walk(grammarAST);
+ GrammarAST.GrammarNode gn = (GrammarAST.GrammarNode)o;
+ EmitContext ecx = ga.new EmitContext(gn);
+ gn.emitCode(ecx, pw, "com.foo", "ClassName");
+ }
+
private static Object illegalTag = ""; // this is the tag that should never appear in the non-dropped output FIXME
// Instance //////////////////////////////////////////////////////////////////////////////
if (head.equals("Quoted")) return stringifyChildren(t);
if (head.equals("Literal")) return new LiteralNode(walkString(t.child(0)));
if (head.equals("->")) return walkSeq(t.child(0)).follow(walkElement(t.child(1)));
- if (head.equals("DropNT")) return new NonTerminalNode(walkString(t.child(0)), (Seq[][])walkChildren(t.child(1)), false, null, true);
+ if (head.equals("DropNT")) return new NonTerminalNode(walkString(t.child(0)), (Seq[][])walkChildren(t.child(1)), false, null, true, false);
if (head.equals("=")) return new NonTerminalNode(walkString(t.child(0)), (Seq[][])walk(t.child(2)),
- true, t.size()==2 ? null : walkString(t.child(1)), false);
+ true, t.size()==2 ? null : walkString(t.child(1)), false, false);
if (head.equals("&")) return walkSeq(t.child(0)).and(walkSeq(t.child(1)));
if (head.equals("&~")) return walkSeq(t.child(0)).andnot(walkSeq(t.child(1)));
if (head.equals("/")) return (walkSeq(t.child(0))).separate(walkElement(t.child(1)));
if (head.equals("SubGrammar")) return GrammarAST.buildFromAST(t.child(0), "s", resolver);
if (head.equals("NonTerminal"))
return new NonTerminalNode(walkString(t.child(0)),
- (Seq[][])walkChildren(t.child(1)), false, null, false);
+ (Seq[][])walkChildren(t.child(1)), false, null, false, false);
if (head.equals("Colons")) {
String tag = walkString(t.child(0));
Seq[][] seqs = (Seq[][])walk(t.child(1));
for(Seq[] seq : seqs)
for(int i=0; i<seq.length; i++)
seq[i] = seq[i].tag(tag);
- return new NonTerminalNode(tag, seqs, false, null, false);
+ return new NonTerminalNode(tag, seqs, false, null, false, true);
}
if (head.equals("#import")) {
if (resolver != null) {
return (Union)cx.get(nt.name);
return null;
}
+ public void emitCode(EmitContext cx, PrintWriter pw, String packageName, String className) {
+ pw.println("package " + packageName + ";");
+ pw.println("public class " + className + " {");
+ // FIXME: root walking method
+ //pw.println(" public static XXX walk() root");
+ for(NonTerminalNode nt : values()) {
+ if (!(nt.name.charAt(0) >= 'A' && nt.name.charAt(0) <= 'Z')) continue;
+ StringBuffer fieldDeclarations = new StringBuffer();
+ StringBuffer walkCode = new StringBuffer();
+ nt.getUnionNode().emitCode(cx, fieldDeclarations, walkCode);
+ if (nt.tagged) {
+ pw.println(" public static class " + nt.name + "{");
+ pw.println(fieldDeclarations);
+ pw.println(" }");
+ pw.println(" public static " + nt.name + " walk"+nt.name+"(Tree t) {");
+ pw.println(" int i = 0;");
+ pw.println(walkCode);
+ pw.println(" }");
+ } else {
+ // FIXME; list who extends it
+ pw.println(" public static interface " + nt.name + "{ }");
+ // FIXME: what on earth is this going to be?
+ pw.println(" public static " + nt.name + " walk"+nt.name+"(Tree t) {");
+ pw.println(" throw new Error(\"FIXME\");");
+ pw.println(" }");
+ }
+ }
+ pw.println("}");
+ }
}
/** a NonTerminal is always a union at the top level */
public final String name;
public final ElementNode elementNode;
public final UnionNode unionNode;
- public NonTerminalNode(String name, Seq[][] sequences, boolean rep, String sep, boolean alwaysDrop) {
+ public final boolean tagged;
+ public NonTerminalNode(String name, Seq[][] sequences, boolean rep, String sep, boolean alwaysDrop, boolean tagged) {
this.name = prefix + name;
this.alwaysDrop = alwaysDrop;
+ this.tagged = tagged;
this.unionNode = new UnionNode(sequences, rep, sep==null?null:(prefix + sep));
this.elementNode = alwaysDrop ? new DropNode(unionNode) : unionNode;
}
- public boolean isDropped(BuildContext cx) { return alwaysDrop; }
+ public boolean isDropped(Context cx) { return alwaysDrop; }
public Element build(BuildContext cx, NonTerminalNode cnt, boolean dropall) { return cx.get(name); }
public ElementNode getElementNode() { return elementNode; }
public UnionNode getUnionNode() { return unionNode; }
/** negative conjuncts */
HashSet<Seq> not = new HashSet<Seq>();
public boolean alwaysDrop = false;
- public boolean isDropped(BuildContext cx) {
+
+ public boolean isTagless() {
+ if (alwaysDrop) return true;
+ for(int i=0; i<elements.length; i++)
+ if ((elements[i] instanceof LiteralNode) && ((LiteralNode)elements[i]).caret)
+ return false;
+ if (tag==null) return true;
+ return false;
+ }
+
+ public boolean isDropped(Context cx) {
if (alwaysDrop) return true;
if (tag!=null) return false;
for(int i=0; i<elements.length; i++)
/** the field name to be used when synthesizing AST classes; null if none suggested */
public String getFieldName() { return null; }
public boolean isLifted() { return false; }
- public boolean isDropped(BuildContext cx) { return false; }
+ public boolean isDropped(Context cx) { return false; }
+ //public abstract boolean isTagless();
+ public boolean isTagless() { return false; }
+ public void _emitCode(EmitContext cx,
+ StringBuffer fieldDeclarations,
+ StringBuffer walkCode) {
+ throw new RuntimeException("not implemented " + this.getClass().getName());
+ }
+ public final void emitCode(EmitContext cx,
+ StringBuffer fieldDeclarations,
+ StringBuffer walkCode) {
+ if (isDropped(cx)) return;
+ if (isTagless()) {
+ // parse just the literal text, create an int/float/char/string
+ // FIXME: how do we know which one?
+ walkCode.append(" stringify");
+ } else {
+ }
+ _emitCode(cx, fieldDeclarations, walkCode);
+ walkCode.append(" i++;");
+ }
public Atom toAtom(BuildContext cx) { throw new Error("can't convert a " + this.getClass().getName() + " to an atom: " + this); }
public abstract Element build(BuildContext cx, NonTerminalNode cnt, boolean dropall);
}
this.rep = rep;
this.sep = sep;
}
+
+ public boolean isTagless() {
+ for (Seq[] ss : sequences)
+ for (Seq s : ss)
+ if (!s.isTagless()) return false;
+ return true;
+ }
+
+ public String[] getPossibleEmitClasses() {
+ HashSet<String> cl = new HashSet<String> ();
+ for(Seq[] ss : sequences)
+ for(Seq s : ss) {
+ /*
+ String cls = s.getEmitClass();
+ if (cls != null) cl.add(cls);
+ */
+ }
+ return (String[])cl.toArray(new String[0]);
+ }
+
+ public void _emitCode(EmitContext cx,
+ StringBuffer fieldDeclarations,
+ StringBuffer walkCode) {
+ throw new RuntimeException("not implemented " + this.getClass().getName());
+ }
+
public String getFieldName() { return null; }
public boolean isLifted() { return false; }
- public boolean isDropped(BuildContext cx) {
+ public boolean isDropped(Context cx) {
for(Seq[] seqs : sequences)
for(Seq seq : seqs)
if (!seq.isDropped(cx))
this.nonTerminal = nonTerminal.indexOf('.')==-1 ? (prefix + nonTerminal) : nonTerminal;
this.parenthesized = parenthesized;
}
- public NonTerminalNode resolve(BuildContext cx) {
+ public NonTerminalNode resolve(Context cx) {
NonTerminalNode ret = cx.grammar.get(nonTerminal);
if (ret==null) throw new RuntimeException("undefined nonterminal: " + nonTerminal);
return ret;
if (ret == null) throw new RuntimeException("unknown nonterminal \""+nonTerminal+"\"");
return ret.toAtom(cx);
}
- public boolean isDropped(BuildContext cx) { return resolve(cx).isDropped(cx); }
+ public boolean isDropped(Context cx) { return resolve(cx).isDropped(cx); }
public Element build(BuildContext cx, NonTerminalNode cnt, boolean dropall) {
Element ret = cx.get(nonTerminal);
if (ret == null) throw new RuntimeException("unknown nonterminal \""+nonTerminal+"\"");
}
public String getLiteralTag() { return caret ? thePrefix+string : null; }
public String toString() { return "\""+string+"\""; }
- public boolean isDropped(BuildContext cx) { return true; }
+ public boolean isDropped(Context cx) { return true; }
public Atom toAtom(BuildContext cx) {
if (string.length()!=1) return super.toAtom(cx);
Range.Set set = new Range.Set();
this.e = e; this.sep = sep; this.zero = zero; this.many = many; this.max = max;
}
public Atom toAtom(BuildContext cx) { return sep==null ? e.toAtom(cx) : super.toAtom(cx); }
- public boolean isDropped(BuildContext cx) { return e.isDropped(cx); }
+ public boolean isDropped(Context cx) { return e.isDropped(cx); }
public Element build(BuildContext cx, NonTerminalNode cnt, boolean dropall) {
Element ret = build(cx, cnt, dropall, illegalTag);
String must = "must be tagged unless they appear within a dropped expression or their contents are dropped: ";
private abstract class ElementNodeWrapper extends ElementNode {
protected ElementNode _e;
public ElementNodeWrapper(ElementNode e) { this._e = e; }
- public boolean isDropped(BuildContext cx) { return _e.isDropped(cx); }
+ public boolean isDropped(Context cx) { return _e.isDropped(cx); }
public Atom toAtom(BuildContext cx) { return _e.toAtom(cx); }
public Element build(BuildContext cx, NonTerminalNode cnt, boolean dropall) { return _e.build(cx, cnt, dropall); }
public String getFieldName() { return _e.getFieldName(); }
+ public void _emitCode(EmitContext cx, StringBuffer fieldDeclarations, StringBuffer walkCode) {
+ _e._emitCode(cx, fieldDeclarations, walkCode);
+ }
}
/** a backtick node indicating that, when building the AST, the node's children should be inserted here */
private class BacktickNode extends ElementNodeWrapper {
public BacktickNode(ElementNode e) { super(e); }
public boolean isLifted() { return true; }
+ public String getFieldName() { throw new Error("FIXME: backtick isn't a single field"); }
+ public void _emitCode(EmitContext cx, StringBuffer fieldDeclarations, StringBuffer walkCode) {
+ _e._emitCode(cx, fieldDeclarations, walkCode);
+ }
}
/** negation */
private class DropNode extends ElementNodeWrapper {
public DropNode(ElementNode e) { super(e); }
- public boolean isDropped(BuildContext cx) { return true; }
+ public boolean isDropped(Context cx) { return true; }
}
/** provides a label on the fields of a Seq */
//////////////////////////////////////////////////////////////////////////////
- public class BuildContext {
+ public class Context {
public HashMap<String,Union> map = new HashMap<String,Union>();
public GrammarNode grammar;
+ public Context() { }
+ public Context(GrammarNode g) { this.grammar = g; }
+ }
+
+
+ public class EmitContext extends Context {
+ public EmitContext(GrammarNode g) { super(g); }
+ }
+
+ public class BuildContext extends Context {
public BuildContext(Tree t) { }
- public BuildContext(GrammarNode g) { this.grammar = g; }
+ public BuildContext(GrammarNode g) { super(g); }
public Union build() {
Union ret = null;
for(NonTerminalNode nt : grammar.values()) {
projects / sbp.git / commitdiff