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/* NSC -- new Scala compiler
* Copyright 2005-2010 LAMP/EPFL
* @author Martin Odersky
*/
// $Id$
package scala.tools.nsc
package symtab
package classfile
import java.util.{StringTokenizer, NoSuchElementException}
import scala.collection.mutable.ListBuffer
import scala.tools.nsc.util.{Position,NoPosition}
abstract class MetaParser{
val global: Global
import global._
private var scanner: StringTokenizer = _
private var owner: Symbol = _
private var ownertype: Type = _
private var token: String = _
private var locals: Scope = null
def parse(meta: String, sym: Symbol, symtype: Type) {
//System.out.println("parse meta for " + sym + ":" + meta + ", locals = " + locals);//DEBUG
this.scanner = new StringTokenizer(meta, "()[], \t<;", true)
this.owner = sym
this.ownertype = symtype
nextToken()
if (token == "class") parseClass()
else if (token == "method") parseMethod()
else if (token == "field") parseField()
else if (token == "constr") parseConstr()
else owner.setInfo(symtype);
}
protected def nextToken() {
try {
do { token = scanner.nextToken().trim() } while (token.length() == 0)
} catch {
case ex: NoSuchElementException => token = ""
}
}
protected def parseType(): Type = {
val str = token
nextToken()
val sym = locals.lookup(newTypeName(str))
if (sym != NoSymbol) sym.tpe
else {
val tp = definitions.getClass(str).tpe;
if (token != "[") tp
else {
val args = new ListBuffer[Type];
do {
nextToken(); args += parseType();
} while (token == ",");
nextToken();
appliedType(tp, args.toList)
}
}
}
protected def parseTypeParam(): Symbol = {
val vflag =
if (token == "+") { nextToken(); Flags.COVARIANT }
else if (token == "-") { nextToken(); Flags.CONTRAVARIANT }
else 0;
assert(token startsWith "?", token)
val sym = owner.newTypeParameter(NoPosition, newTypeName(token)).setFlag(vflag)
nextToken()
val lo =
if (token == ">") { nextToken(); parseType() }
else definitions.NothingClass.tpe
val hi =
if (token == "<") { nextToken(); parseType() }
else definitions.AnyClass.tpe
sym.setInfo(mkTypeBounds(lo, hi))
locals enter sym;
sym
}
protected def parseTypeParams(): List[Symbol] = {
nextToken()
val syms = new ListBuffer[Symbol]
if (token != "]") {
syms += parseTypeParam()
while (token == ",") {
nextToken(); syms += parseTypeParam();
}
}
assert(token == "]")
syms.toList
}
protected def parseParams(): List[Type] = {
nextToken()
val tps = new ListBuffer[Type]
if (token != ")") {
tps += parseType()
while (token == ",") {
nextToken(); tps += parseType()
}
}
assert(token == ")")
tps.toList
}
protected def parseClass() {
locals = new Scope
def parse(): Type = {
nextToken()
if (token == "[") {
PolyType(parseTypeParams(), parse())
} else if (token == "extends") {
val tps = new ListBuffer[Type]
do {
nextToken(); tps += parseType()
} while (token == "with");
ownertype match {
case ClassInfoType(parents, decls, clazz) =>
ClassInfoType(tps.toList, decls, clazz)
}
} else ownertype
}
owner.setInfo(parse())
assert(token == ";")
}
protected def parseMethod() {
val globals = locals
locals = if (locals eq null) new Scope else new Scope(locals)
def parse(): Type = {
nextToken();
if (token == "[") PolyType(parseTypeParams(), parse())
else if (token == "(") {
val formals = parseParams()
MethodType(owner.newSyntheticValueParams(formals), parse())
}
else parseType()
}
owner.setInfo(parse())
locals = globals
assert(token == ";")
}
protected def parseField() {
nextToken()
owner.setInfo(parseType())
assert(token == ";")
}
protected def parseConstr() {
def parse(): Type = {
nextToken()
if (token == "(") {
val formals = parseParams()
MethodType(owner.newSyntheticValueParams(formals), parse())
}
else owner.owner.tpe
}
owner.setInfo(parse())
assert(token == ";")
}
}
|
