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/* NSC -- new Scala compiler
* Copyright 2005-2010 LAMP/EPFL
* @author Martin Odersky
*/
// $Id$
package scala.tools.nsc
package 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
// For supporting java enumerations inside java annotations (see ClassfileParser)
final val EnumTag = LITERALenum - LITERAL
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 == 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 =>
// given (in java): "class A { enum E { VAL1 } }"
// - symbolValue: the symbol of the actual enumeration value (VAL1)
// - .owner: the ModuleClasSymbol of the enumeration (object E)
// - .linkedClassOfClass: the ClassSymbol of the enumeration (class E)
symbolValue.owner.linkedClassOfClass.tpe
}
/** 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.tag == that.tag &&
(this.value == that.value || isNaN(this.value) && isNaN(that.value))
case _ => false
}
def isNaN(value: Any) = value match {
case f: Float => f.isNaN
case d: Double => d.isNaN
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].toByte
case CharTag => value.asInstanceOf[Char].toByte
case IntTag => value.asInstanceOf[Int].toByte
case LongTag => value.asInstanceOf[Long].toByte
case FloatTag => value.asInstanceOf[Float].toByte
case DoubleTag => value.asInstanceOf[Double].toByte
case _ => throw new Error("value " + value + " is not a Byte")
}
def shortValue: Short = tag match {
case ByteTag => value.asInstanceOf[Byte].toShort
case ShortTag => value.asInstanceOf[Short]
case CharTag => value.asInstanceOf[Char].toShort
case IntTag => value.asInstanceOf[Int].toShort
case LongTag => value.asInstanceOf[Long].toShort
case FloatTag => value.asInstanceOf[Float].toShort
case DoubleTag => value.asInstanceOf[Double].toShort
case _ => throw new Error("value " + value + " is not a Short")
}
def charValue: Char = tag match {
case ByteTag => value.asInstanceOf[Byte].toChar
case ShortTag => value.asInstanceOf[Short].toChar
case CharTag => value.asInstanceOf[Char]
case IntTag => value.asInstanceOf[Int].toChar
case LongTag => value.asInstanceOf[Long].toChar
case FloatTag => value.asInstanceOf[Float].toChar
case DoubleTag => value.asInstanceOf[Double].toChar
case _ => throw new Error("value " + value + " is not a Char")
}
def intValue: Int = tag match {
case ByteTag => value.asInstanceOf[Byte].toInt
case ShortTag => value.asInstanceOf[Short].toInt
case CharTag => value.asInstanceOf[Char].toInt
case IntTag => value.asInstanceOf[Int]
case LongTag => value.asInstanceOf[Long].toInt
case FloatTag => value.asInstanceOf[Float].toInt
case DoubleTag => value.asInstanceOf[Double].toInt
case _ => throw new Error("value " + value + " is not an Int")
}
def longValue: Long = tag match {
case ByteTag => value.asInstanceOf[Byte].toLong
case ShortTag => value.asInstanceOf[Short].toLong
case CharTag => value.asInstanceOf[Char].toLong
case IntTag => value.asInstanceOf[Int].toLong
case LongTag => value.asInstanceOf[Long]
case FloatTag => value.asInstanceOf[Float].toLong
case DoubleTag => value.asInstanceOf[Double].toLong
case _ => throw new Error("value " + value + " is not a Long")
}
def floatValue: Float = tag match {
case ByteTag => value.asInstanceOf[Byte].toFloat
case ShortTag => value.asInstanceOf[Short].toFloat
case CharTag => value.asInstanceOf[Char].toFloat
case IntTag => value.asInstanceOf[Int].toFloat
case LongTag => value.asInstanceOf[Long].toFloat
case FloatTag => value.asInstanceOf[Float]
case DoubleTag => value.asInstanceOf[Double].toFloat
case _ => throw new Error("value " + value + " is not a Float")
}
def doubleValue: Double = tag match {
case ByteTag => value.asInstanceOf[Byte].toDouble
case ShortTag => value.asInstanceOf[Short].toDouble
case CharTag => value.asInstanceOf[Char].toDouble
case IntTag => value.asInstanceOf[Int].toDouble
case LongTag => value.asInstanceOf[Long].toDouble
case FloatTag => value.asInstanceOf[Float].toDouble
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.iterator)
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]
override def hashCode(): Int =
if (value == null) 0 else value.hashCode() * 41 + 17
}
}
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