From c024a6037f3dd7e7458d936566cd4b653b8b7545 Mon Sep 17 00:00:00 2001 From: Martin Odersky Date: Thu, 16 Mar 2017 15:15:28 +0100 Subject: Break out functionality from MethodType and generalize MethodParam to ParamRef, and TypeParamInfo to ParamInfo --- compiler/src/dotty/tools/dotc/core/ParamInfo.scala | 40 ++++++++++++++++++++++ 1 file changed, 40 insertions(+) create mode 100644 compiler/src/dotty/tools/dotc/core/ParamInfo.scala (limited to 'compiler/src/dotty/tools/dotc/core/ParamInfo.scala') diff --git a/compiler/src/dotty/tools/dotc/core/ParamInfo.scala b/compiler/src/dotty/tools/dotc/core/ParamInfo.scala new file mode 100644 index 000000000..efae24916 --- /dev/null +++ b/compiler/src/dotty/tools/dotc/core/ParamInfo.scala @@ -0,0 +1,40 @@ +package dotty.tools.dotc.core + +import Names.TypeName +import Contexts.Context +import Types.{Type, TypeBounds} + +/** A common super trait of Symbol and LambdaParam. + * Used to capture the attributes of type parameters which can be implemented as either. + */ +trait ParamInfo { + + /** Is this the info of a type parameter? Will return `false` for symbols + * that are not type parameters. + */ + def isTypeParam(implicit ctx: Context): Boolean + + /** The name of the type parameter */ + def paramName(implicit ctx: Context): TypeName + + /** The info of the type parameter */ + def paramInfo(implicit ctx: Context): Type + + /** The info of the type parameter as seen from a prefix type. + * For type parameter symbols, this is the `memberInfo` as seen from `prefix`. + * For type lambda parameters, it's the same as `paramBounds` as + * `asSeenFrom` has already been applied to the whole type lambda. + */ + def paramInfoAsSeenFrom(pre: Type)(implicit ctx: Context): Type + + /** The parameter bounds, or the completer if the type parameter + * is an as-yet uncompleted symbol. + */ + def paramInfoOrCompleter(implicit ctx: Context): Type + + /** The variance of the type parameter */ + def paramVariance(implicit ctx: Context): Int + + /** A type that refers to the parameter */ + def paramRef(implicit ctx: Context): Type +} \ No newline at end of file -- cgit v1.2.3