DSLlike

DSLlike is a descriptive term used in software development to refer to interfaces that mimic a domain-specific language within a general-purpose host language. A DSLlike interface presents domain-oriented constructs, vocabulary, and syntax, but resides inside the host language rather than as a separate executable language.

There are two common realizations: internal (embedded) DSLs, implemented as libraries, APIs, or language features that expose a domain-specific API; and fluent or chaining interfaces that approximate a DSL through method chaining and builder patterns. These approaches leverage the host language’s syntax, type system, and tooling while providing a more expressive, readable way to specify domain rules or configurations.

Common examples include LINQ in C#, which offers a query DSL inside the language; SQL query builders in Python or Java that resemble SQL syntax; and testing or configuration DSLs in Ruby or Kotlin, where the aim is to write code that reads like the domain language. Build scripts and configuration for some ecosystems are also described as DSLlike because they use domain-specific constructs within the host language or a fluent API. DSLlike interfaces are frequently applied in areas such as data querying, configuration, testing, data transformation, and rule specification.

Advantages of DSLlike designs include improved readability, a closer mapping to domain concepts, and opportunities for safer composition and validation within the host language. Potential drawbacks include increased coupling to the host language, limited expressiveness for tasks outside the domain, a steeper learning curve for developers, and maintenance challenges as the host language evolves.

See also: Domain-specific language, internal DSL, fluent interface, embedded DSL.