README

# 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