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/* NSC -- new Scala compiler
* Copyright 2005-2011 LAMP/EPFL
* @author Martin Odersky
*/
package scala.tools.nsc
package symtab
import util.Chars.isOperatorPart
/** A trait to encapsulate name mangling. It's intended for the
* values and methods involved in assembling names out of other names,
* and not for simple synthetically named locals.
*/
trait NameManglers {
self: SymbolTable =>
trait NameMangling {
self: nme.type =>
val IMPL_CLASS_SUFFIX = "$class"
val LOCALDUMMY_PREFIX = "<local " // owner of local blocks
val PROTECTED_PREFIX = "protected$"
val PROTECTED_SET_PREFIX = PROTECTED_PREFIX + "set"
val SELECTOR_DUMMY = "<unapply-selector>"
val SETTER_SUFFIX = encode("_=")
val SUPER_PREFIX_STRING = "super$"
val TRAIT_SETTER_SEPARATOR_STRING = "$_setter_$"
def isConstructorName(name: Name) = name == CONSTRUCTOR || name == MIXIN_CONSTRUCTOR
def isExceptionResultName(name: Name) = name startsWith EXCEPTION_RESULT_PREFIX
def isImplClassName(name: Name) = name endsWith IMPL_CLASS_SUFFIX
def isLocalDummyName(name: Name) = name startsWith LOCALDUMMY_PREFIX
def isLocalName(name: Name) = name endsWith LOCAL_SUFFIX_STRING
def isLoopHeaderLabel(name: Name) = (name startsWith WHILE_PREFIX) || (name startsWith DO_WHILE_PREFIX)
def isProtectedAccessorName(name: Name) = name startsWith PROTECTED_PREFIX
def isSetterName(name: Name) = name endsWith SETTER_SUFFIX
def isTraitSetterName(name: Name) = isSetterName(name) && (name containsName TRAIT_SETTER_SEPARATOR_STRING)
def isOpAssignmentName(name: Name) = name match {
case raw.NE | raw.LE | raw.GE | EMPTY => false
case _ =>
name.endChar == '=' && name.startChar != '=' && isOperatorPart(name.startChar)
}
/** The expanded setter name of `name' relative to this class `base`
*/
def expandedSetterName(name: TermName, base: Symbol): TermName =
expandedName(name, base, separator = TRAIT_SETTER_SEPARATOR_STRING)
/** If `name' is an expandedName name, the original name.
* Otherwise `name' itself.
*/
def originalName(name: Name): Name = {
var i = name.length
while (i >= 2 && !(name(i - 1) == '$' && name(i - 2) == '$')) i -= 1
if (i >= 2) {
while (i >= 3 && name(i - 3) == '$') i -= 1
name.subName(i, name.length)
} else name
}
/** Return the original name and the types on which this name
* is specialized. For example,
* {{{
* splitSpecializedName("foo$mIcD$sp") == ('foo', "I", "D")
* }}}
* `foo$mIcD$sp` is the name of a method specialized on two type
* parameters, the first one belonging to the method itself, on Int,
* and another one belonging to the enclosing class, on Double.
*/
def splitSpecializedName(name: Name): (Name, String, String) =
if (name.endsWith("$sp")) {
val name1 = name.subName(0, name.length - 3)
val idxC = name1.lastPos('c')
val idxM = name1.lastPos('m', idxC)
(name1.subName(0, idxM - 1),
name1.subName(idxC + 1, name1.length).toString,
name1.subName(idxM + 1, idxC).toString)
} else
(name, "", "")
def getterName(name: TermName): TermName = if (isLocalName(name)) localToGetter(name) else name
def getterToLocal(name: TermName): TermName = name.toTermName append LOCAL_SUFFIX_STRING
def getterToSetter(name: TermName): TermName = name.toTermName append SETTER_SUFFIX
def localToGetter(name: TermName): TermName = name stripEnd LOCAL_SUFFIX_STRING toTermName
def setterToGetter(name: TermName): TermName = {
val p = name.pos(TRAIT_SETTER_SEPARATOR_STRING)
if (p < name.length)
setterToGetter(name.subName(p + TRAIT_SETTER_SEPARATOR_STRING.length, name.length))
else
name stripEnd SETTER_SUFFIX toTermName
}
def defaultGetterName(name: Name, pos: Int): TermName = {
val prefix = if (isConstructorName(name)) "init" else name
newTermName(prefix + DEFAULT_GETTER_STRING + pos)
}
def implClassName(name: Name): TypeName = name append IMPL_CLASS_SUFFIX toTypeName
def interfaceName(implname: Name): TypeName = implname stripEnd IMPL_CLASS_SUFFIX toTypeName
def localDummyName(clazz: Symbol): TermName = newTermName(LOCALDUMMY_PREFIX + clazz.name + ">")
def productAccessorName(i: Int): TermName = newTermName("_" + i)
def superName(name: Name): TermName = newTermName(SUPER_PREFIX_STRING + name)
/** The name of an accessor for protected symbols. */
def protName(name: Name): TermName = newTermName(PROTECTED_PREFIX + name)
/** The name of a setter for protected symbols. Used for inherited Java fields. */
def protSetterName(name: Name): TermName = newTermName(PROTECTED_SET_PREFIX + name)
}
}
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