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/* NSC -- new Scala compiler
* Copyright 2005-2009 LAMP/EPFL
* @author Martin Odersky
*/
// $Id$
package scala.tools.nsc.symtab
import java.lang.Integer.toOctalString
import classfile.PickleFormat._
trait Constants {
self: SymbolTable =>
import definitions._
final val NoTag = LITERAL - LITERAL
final val UnitTag = LITERALunit - LITERAL
final val BooleanTag = LITERALboolean - LITERAL
final val ByteTag = LITERALbyte - LITERAL
final val ShortTag = LITERALshort - LITERAL
final val CharTag = LITERALchar - LITERAL
final val IntTag = LITERALint - LITERAL
final val LongTag = LITERALlong - LITERAL
final val FloatTag = LITERALfloat - LITERAL
final val DoubleTag = LITERALdouble - LITERAL
final val StringTag = LITERALstring - LITERAL
final val NullTag = LITERALnull - LITERAL
final val ClassTag = LITERALclass - LITERAL
final val EnumTag = ClassTag + 1
final val ArrayTag = EnumTag + 1
final val AnnotationTag = ArrayTag + 1
def isNumeric(tag: Int) = ByteTag <= tag && tag <= DoubleTag
case class Constant(value: Any) {
val tag: Int =
if (value.isInstanceOf[Unit]) UnitTag
else if (value.isInstanceOf[Boolean]) BooleanTag
else if (value.isInstanceOf[Byte]) ByteTag
else if (value.isInstanceOf[Short]) ShortTag
else if (value.isInstanceOf[Char]) CharTag
else if (value.isInstanceOf[Int]) IntTag
else if (value.isInstanceOf[Long]) LongTag
else if (value.isInstanceOf[Float]) FloatTag
else if (value.isInstanceOf[Double]) DoubleTag
else if (value.isInstanceOf[String]) StringTag
else if (value.isInstanceOf[Type]) ClassTag
else if (value.isInstanceOf[Symbol]) EnumTag
else if (value.isInstanceOf[Array[Constant]]) ArrayTag
else if (value == null) NullTag
else throw new Error("bad constant value: " + value)
def tpe: Type = tag match {
case UnitTag => UnitClass.tpe
case BooleanTag => BooleanClass.tpe
case ByteTag => ByteClass.tpe
case ShortTag => ShortClass.tpe
case CharTag => CharClass.tpe
case IntTag => IntClass.tpe
case LongTag => LongClass.tpe
case FloatTag => FloatClass.tpe
case DoubleTag => DoubleClass.tpe
case StringTag => StringClass.tpe
case NullTag => NullClass.tpe
case ClassTag => Predef_classOfType(value.asInstanceOf[Type])
case EnumTag => symbolValue.owner.linkedClassOfClass.tpe
case AnnotationTag => AnnotationClass.tpe // what should it be?
}
/** We need the equals method to take account of tags as well as values.
*
* @param other ...
* @return ...
*/
override def equals(other: Any): Boolean = other match {
case that: Constant => this.value == that.value && this.tag == that.tag
case _ => false
}
def booleanValue: Boolean =
if (tag == BooleanTag) value.asInstanceOf[Boolean]
else throw new Error("value " + value + " is not a boolean");
def byteValue: Byte = tag match {
case ByteTag => value.asInstanceOf[Byte]
case ShortTag => value.asInstanceOf[Short].asInstanceOf[Byte]
case CharTag => value.asInstanceOf[Char].asInstanceOf[Byte]
case IntTag => value.asInstanceOf[Int].asInstanceOf[Byte]
case LongTag => value.asInstanceOf[Long].asInstanceOf[Byte]
case FloatTag => value.asInstanceOf[Float].asInstanceOf[Byte]
case DoubleTag => value.asInstanceOf[Double].asInstanceOf[Byte]
case _ => throw new Error("value " + value + " is not a Byte")
}
def shortValue: Short = tag match {
case ByteTag => value.asInstanceOf[Byte].asInstanceOf[Short]
case ShortTag => value.asInstanceOf[Short]
case CharTag => value.asInstanceOf[Char].asInstanceOf[Short]
case IntTag => value.asInstanceOf[Int].asInstanceOf[Short]
case LongTag => value.asInstanceOf[Long].asInstanceOf[Short]
case FloatTag => value.asInstanceOf[Float].asInstanceOf[Short]
case DoubleTag => value.asInstanceOf[Double].asInstanceOf[Short]
case _ => throw new Error("value " + value + " is not a Short")
}
def charValue: Char = tag match {
case ByteTag => value.asInstanceOf[Byte].asInstanceOf[Char]
case ShortTag => value.asInstanceOf[Short].asInstanceOf[Char]
case CharTag => value.asInstanceOf[Char]
case IntTag => value.asInstanceOf[Int].asInstanceOf[Char]
case LongTag => value.asInstanceOf[Long].asInstanceOf[Char]
case FloatTag => value.asInstanceOf[Float].asInstanceOf[Char]
case DoubleTag => value.asInstanceOf[Double].asInstanceOf[Char]
case _ => throw new Error("value " + value + " is not a Char")
}
def intValue: Int = tag match {
case ByteTag => value.asInstanceOf[Byte].asInstanceOf[Int]
case ShortTag => value.asInstanceOf[Short].asInstanceOf[Int]
case CharTag => value.asInstanceOf[Char].asInstanceOf[Int]
case IntTag => value.asInstanceOf[Int]
case LongTag => value.asInstanceOf[Long].asInstanceOf[Int]
case FloatTag => value.asInstanceOf[Float].asInstanceOf[Int]
case DoubleTag => value.asInstanceOf[Double].asInstanceOf[Int]
case _ => throw new Error("value " + value + " is not an Int")
}
def longValue: Long = tag match {
case ByteTag => value.asInstanceOf[Byte].asInstanceOf[Long]
case ShortTag => value.asInstanceOf[Short].asInstanceOf[Long]
case CharTag => value.asInstanceOf[Char].asInstanceOf[Long]
case IntTag => value.asInstanceOf[Int].asInstanceOf[Long]
case LongTag => value.asInstanceOf[Long]
case FloatTag => value.asInstanceOf[Float].asInstanceOf[Long]
case DoubleTag => value.asInstanceOf[Double].asInstanceOf[Long]
case _ => throw new Error("value " + value + " is not a Long")
}
def floatValue: Float = tag match {
case ByteTag => value.asInstanceOf[Byte].asInstanceOf[Float]
case ShortTag => value.asInstanceOf[Short].asInstanceOf[Float]
case CharTag => value.asInstanceOf[Char].asInstanceOf[Float]
case IntTag => value.asInstanceOf[Int].asInstanceOf[Float]
case LongTag => value.asInstanceOf[Long].asInstanceOf[Float]
case FloatTag => value.asInstanceOf[Float]
case DoubleTag => value.asInstanceOf[Double].asInstanceOf[Float]
case _ => throw new Error("value " + value + " is not a Float")
}
def doubleValue: Double = tag match {
case ByteTag => value.asInstanceOf[Byte].asInstanceOf[Double]
case ShortTag => value.asInstanceOf[Short].asInstanceOf[Double]
case CharTag => value.asInstanceOf[Char].asInstanceOf[Double]
case IntTag => value.asInstanceOf[Int].asInstanceOf[Double]
case LongTag => value.asInstanceOf[Long].asInstanceOf[Double]
case FloatTag => value.asInstanceOf[Float].asInstanceOf[Double]
case DoubleTag => value.asInstanceOf[Double]
case _ => throw new Error("value " + value + " is not a Double")
}
/** Convert constant value to conform to given type.
*
* @param pt ...
* @return ...
*/
def convertTo(pt: Type): Constant = {
val target = pt.typeSymbol
if (target == tpe.typeSymbol)
this
else if (target == ByteClass && ByteTag <= tag && tag <= IntTag &&
-128 <= intValue && intValue <= 127)
Constant(byteValue)
else if (target == ShortClass && ByteTag <= tag && tag <= IntTag &&
-32768 <= intValue && intValue <= 32767)
Constant(shortValue)
else if (target == CharClass && ByteTag <= tag && tag <= IntTag &&
0 <= intValue && intValue <= 65635)
Constant(charValue)
else if (target == IntClass && ByteTag <= tag && tag <= IntTag)
Constant(intValue)
else if (target == LongClass && ByteTag <= tag && tag <= LongTag)
Constant(longValue)
else if (target == FloatClass && ByteTag <= tag && tag <= FloatTag)
Constant(floatValue)
else if (target == DoubleClass && ByteTag <= tag && tag <= DoubleTag)
Constant(doubleValue)
else {
null
}
}
def stringValue: String =
if (value == null) "null"
else if (tag == ClassTag) signature(typeValue)
else value.toString()
def escapedStringValue: String = {
def escape(text: String): String = {
val buf = new StringBuilder
for (c <- text.elements)
if (c.isControl)
buf.append("\\0" + toOctalString(c.asInstanceOf[Int]))
else
buf.append(c)
buf.toString
}
tag match {
case NullTag => "null"
case StringTag => "\"" + escape(stringValue) + "\""
case ClassTag => "classOf[" + signature(typeValue) + "]"
case CharTag => escape("\'" + charValue + "\'")
case LongTag => longValue.toString() + "L"
case _ => value.toString()
}
}
def typeValue: Type = value.asInstanceOf[Type]
def symbolValue: Symbol = value.asInstanceOf[Symbol]
def arrayValue: Array[Constant] =
throw new Error("value " + value + " is not an array")
override def hashCode(): Int =
if (value == null) 0 else value.hashCode() * 41 + 17
}
class ArrayConstant(override val arrayValue: Array[Constant],
override val tpe: Type)
extends Constant(arrayValue) {
override def toString() = arrayValue.mkString("Constant(", "," , ")")
}
/** A place-holder for annotation constants. The contents of
* the constant are not read. */
class AnnotationConstant()
extends Constant(null) {
override val tag = AnnotationTag
}
}
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