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/* ____ ____ ____ ____ ______ *\
** / __// __ \/ __// __ \/ ____/ SOcos COmpiles Scala **
** __\_ \/ /_/ / /__/ /_/ /\_ \ (c) 2002, 2003, 2004, LAMP/EPFL **
** /_____/\____/\___/\____/____/ **
** **
** $Id$
\* */
package scalac.symtab.classfile;
import scala.tools.util.Position;
import scalac.util.Name;
import scalac.symtab.Modifiers;
import scalac.symtab.Symbol;
import scalac.symtab.Scope;
import scalac.symtab.Type;
import scalac.ApplicationError;
import scalac.util.Debug;
import java.util.Vector;
import java.util.StringTokenizer;
import java.util.NoSuchElementException;
/** a parser class for parsing meta type information in classfiles
* generated by pico.
*/
class MetaParser {
private final Symbol owner;
private final StringTokenizer scanner;
private final Type defaultType;
private String token;
private final Scope tvars;
private Scope locals;
private final Symbol clazz;
private final Type ctype;
private final JavaTypeFactory make;
MetaParser(String meta, Scope tvars, Symbol owner, Type defaultType,
Symbol clazz, Type ctype, JavaTypeFactory make) {
this.scanner = new StringTokenizer(meta, "()[], \t<;", true);
this.defaultType = defaultType;
this.owner = owner;
this.tvars = tvars;
this.clazz = clazz;
this.ctype = ctype;
this.make = make;
}
private static Name getTypeName(String name) {
return Name.fromString(name).toTypeName();
}
private Symbol getTVar(String name) {
return getTVar(name, clazz.primaryConstructor());
}
private Symbol getTVar(String name, Symbol owner) {
if (name.startsWith("?")) {
Symbol s = (locals != null ? locals : tvars)
.lookup(getTypeName(name));
if (s != Symbol.NONE)
return s;
else if (locals != null) {
s = tvars.lookup(getTypeName(name));
if (s != Symbol.NONE)
return s;
}
s = owner.newTParam
(Position.NOPOS, 0, getTypeName(token), make.anyType());
tvars.enter(s);
return s;
} else
return Symbol.NONE;
}
private String nextToken() {
do {
token = scanner.nextToken().trim();
} while (token.length() == 0);
return token;
}
protected Type parse() {
if (scanner.hasMoreTokens()) {
nextToken();
if (!scanner.hasMoreTokens())
return defaultType;
if ("class".equals(token))
return parseMetaClass();
if ("method".equals(token))
return parseMetaMethod();
if ("field".equals(token))
return parseMetaField();
if ("constr".equals(token))
return parseConstrField();
}
return defaultType;
}
protected Type parseMetaClass() {
nextToken();
//System.out.println("parse meta class " + token);//DEBUG
if ("[".equals(token)) {
try {
Vector syms = new Vector();
do {
nextToken();
int vflag = 0;
if (token.equals("+")) {
nextToken();
vflag = Modifiers.COVARIANT;
} else if (token.equals("-")) {
nextToken();
vflag = Modifiers.CONTRAVARIANT;
}
assert token.startsWith("?");
Symbol s = getTVar(token);
if (s == Symbol.NONE)
return defaultType;
s.flags |= vflag;
nextToken();
//System.out.println("new var " + s + ", " + token);//DEBUG
if (token.equals("<")) {
nextToken();
s.setInfo(parseType());
}
syms.add(s);
} while (token.equals(","));
assert "]".equals(token);
nextToken();
Symbol[] smbls = (Symbol[])syms.toArray(new Symbol[syms.size()]);
//System.out.println("*** " + syms);//DEBUG
Type clazztype = Type.appliedType(ctype, Symbol.type(smbls));
Symbol constr = clazz.primaryConstructor();
switch (constr.rawInfo()) {
case MethodType(Symbol[] vparams, _):
constr.setInfo(Type.PolyType
(smbls, Type.MethodType(vparams, clazztype)));
break;
default:
throw new ApplicationError(constr.rawInfo());
}
} catch (NoSuchElementException e) {
}
}
Type res = defaultType;
if ("extends".equals(token)) {
Vector basetpes = new Vector();
do {
nextToken();
basetpes.add(parseType());
} while (token.equals("with"));
switch (defaultType) {
case CompoundType(_, Scope scope):
Type[] ts = (Type[])basetpes.toArray(new Type[basetpes.size()]);
res = Type.compoundType(ts, scope, defaultType.symbol());
}
}
assert ";".equals(token);
return res;
}
protected Type parseType() {
String name = token;
Symbol s = getTVar(name);
nextToken();
if (s != Symbol.NONE)
return s.type();
Type clazztype = make.classType(name).unalias();
if (token.equals("[")) {
Vector types = new Vector();
do {
nextToken();
types.add(parseType());
} while (token.equals(","));
assert "]".equals(token);
nextToken();
Type[] args = new Type[types.size()];
types.toArray(args);
return Type.appliedType(clazztype, args);
} else {
return clazztype;
}
}
protected Type parseMetaMethod() {
locals = new Scope();
try {
nextToken();
Symbol[] smbls = null;
//System.out.println("parse meta method " + token);
if ("[".equals(token)) {
Vector syms = new Vector();
do {
nextToken();
if ("]".equals(token))
break;
assert token.startsWith("?");
Symbol s = owner.newTParam
(Position.NOPOS, 0, getTypeName(token), make.anyType());
locals.enter(s);
nextToken();
if (token.equals("<")) {
nextToken();
s.setInfo(parseType());
}
syms.add(s);
} while (token.equals(","));
assert "]".equals(token);
nextToken();
smbls = (Symbol[])syms.toArray(new Symbol[syms.size()]);
}
if ("(".equals(token)) {
int i = 0;
Vector params = new Vector();
do {
nextToken();
if (")".equals(token))
break;
int flags = 0;
if ("def".equals(token)) {
nextToken();
flags |= Modifiers.DEF;
}
Symbol vp = owner.newVParam
(Position.NOPOS, flags, Name.fromString("x" + (i++)));
params.add(vp.setInfo(parseType()));
//System.out.println(" + " + token);
} while (token.equals(","));
assert ")".equals(token);
nextToken();
//System.out.println("+++ method " + token);
Type restpe = parseType();
assert ";".equals(token);
Type mtype = Type.MethodType
((Symbol[])params.toArray(new Symbol[params.size()]),
restpe);
return smbls == null ? mtype : Type.PolyType(smbls, mtype);
} else {
Type res = parseType();
assert ";".equals(token);
return Type.PolyType
(smbls == null ? Symbol.EMPTY_ARRAY : smbls, res);
}
} catch (NoSuchElementException e) {
e.printStackTrace();
return defaultType;
} finally {
locals = null;
}
}
protected Type parseMetaField() {
nextToken();
return parseType();
}
protected Type parseConstrField() {
try {
nextToken();
//System.out.println("+++ constr " + token);
if ("(".equals(token)) {
int i = 0;
Vector params = new Vector();
do {
nextToken();
if (")".equals(token))
break;
Symbol vp = owner.newVParam
(Position.NOPOS, 0, Name.fromString("x" + (i++)));
params.add(vp.setInfo(parseType()));
//System.out.println(" + " + token);
} while (token.equals(","));
assert ")".equals(token);
nextToken();
assert ";".equals(token);
return Type.MethodType((Symbol[])params.toArray(new Symbol[params.size()]),
ctype);
} else {
assert ";".equals(token);
return Type.PolyType(Symbol.EMPTY_ARRAY, ctype);
}
} catch (NoSuchElementException e) {
return defaultType;
}
}
}
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