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This article mainly explains "how to express the Scala Reference path". The content in the article is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn how to express the Scala Reference path.

Syntax:

Path:: = StableId

| | [id "."] this

StableId:: = id

| | Path "." id |

| | [id "."] "super" [ClassQualifier] "." id |

ClassQualifier:: = "[" id "]"

Paths are not the type itself, but they can be part of a named type, which is the Scala type system

A core role.

A path is one of the following definitions:

 null path ε (cannot be explicitly written in the program)

 C.this, C is a reference to a class. When within the scope of C reference, the path this is the simplicity of C.this

Write.

 p. X, p is a path, x is a stable member of p. Stable members are defined by objects or are stable

The value of the type defines the incoming package or member (§3.6).

 C.super.x or C. super[ M] .x, C is a reference to a class, x is a superclass of C or a specified parent

A reference to a stable member of class M. The prefix super is an abbreviation for C.super, and C contains a range of references.

The name of the class.

A stable identifier is a path that ends with an identifier.

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