semver-dsl

SemVer DSL

A simple internal DSL which allows you to invoke different functionality depending on version match. Used in codelyzer for keeping the code compatible across different versions of the Angular compiler.

Demo

$ npm i semver-dsl --save

import {SemVerDSL} from 'semver-dsl';

const base = () => {};
const elseIf1 = () => {};
const elseIf2 = () => {};
const else = () => console.log('I will be invoked!');

SemVerDSL('3.0.0')
  .gt('3.2.1', base)
  .elseIf.gt('3.0.1', elseIf1)
  .elseIf.between('3.0.1', '3.1.8', elseIf2)
  .else(else);

In the example above will be invoked else.

API

• SemDSL(version: string) - factory which accepts a version and returns an object.
• gte(version: string, callback?: Function): ISemContextualDSL - returns an object with elseIf and else properties.
• lte(version: string, callback?: Function): ISemContextualDSL - returns an object with elseIf and else properties.
• gt(version: string, callback?: Function): ISemContextualDSL - returns an object with elseIf and else properties.
• lt(version: string, callback?: Function): ISemContextualDSL - returns an object with elseIf and else properties.
• eq(version: string, callback?: Function): ISemContextualDSL - returns an object with elseIf and else properties.
• neq(version: string, callback?: Function): ISemContextualDSL - returns an object with elseIf and else properties.
• between(v1: string, v2: string, callback?: Function): ISemContextualDSL - returns an object with elseIf properties.
• elseIf - returns an object of type ISemVerDSL bound to the previous predicate.
• else - invokes given callback if all of the previous conditions have failed.

export interface ISemVerDSL {
  gte(version: string, callback: Function): ISemContextualDSL;
  lte(version: string, callback: Function): ISemContextualDSL;
  gt(version: string, callback: Function): ISemContextualDSL;
  lt(version: string, callback: Function): ISemContextualDSL;
  eq(version: string, callback: Function): ISemContextualDSL;
  neq(version: string, callback: Function): ISemContextualDSL;
  between(v1: string, v2: string, callback: Function): ISemContextualDSL;
}

export interface ISemVerContextBoundDSL {
  elseIf: ISemVerDSL;
  else(callback: Function): void;
}

License

MIT