Enum

As explained in Building User-Friendly DSLs

An enumeration is a language construct that defines a fixed collection of permitted named values.

An enumeration is a fixed collection of textual values. In an MPS DSL, it is defined as an item in the structure aspect alongside concepts, interfaces, and constrained string datatypes. section 15.4.2

Type enumeration

The Type enumeration defines the permitted types in the example DSL: amount, date range, and percentage. These named values provide a fixed vocabulary for DSL content. section 15.4.2

Figure 15.7 The MPS definitions for the Record Type and Attribute concepts, and the definition for the Type enumeration

Use the definition view to inspect the Type enumeration alongside the Record Type and Attribute concepts. section 15.4.2

How Building User-Friendly DSLs covers it

How deep it goes

Defines the construct and gives one concrete value set, but does not detail declaration or code-generation mechanics.

Examples

Uses the Type enumeration with amount, date range, and percentage values.

What you can do after

Evaluate fixed DSL value categories using a concrete enumeration definition.

How it connects

Connects to DSL metamodels, structure aspects, concepts, interfaces, and constrained string datatypes.

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Related concepts

• result typeincludes · A type that represents an operation’s outcome as either a successful value or a failure value.
• sealed traitalternative to · A sealed trait is a Scala trait whose permitted subtypes are restricted to declarations known to the compiler.
• data structurekind of · A data structure is an organized representation of data and its relationships that supports defined operations for storing, accessing, or modifying it.
• enum varianthas part · An enum variant is one named alternative in an enumeration’s finite set of possible values, optionally containing associated data.
• booleanalternative to · A Boolean is a logical type or value representing truth or falsity, conventionally with two states: true and false.
• enum constanthas part · An enumeration constant is a named member of an enumeration representing one distinct enumerated value.

This explainer was generated by Manning's knowledge graph from the text of Building User-Friendly DSLs. The section links point to the parts of the book it draws on.