Package Exports

stringd

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Readme

STRING-D (NodeJS String Variable Parser)

Create parsable strings using template formats by argument mapping.

Similar to printf but supports nesting and exclusive recursions

Installing

Via NPM:

$ npm install stringd

Usage

// CommonJS
var stringd = require('stringd').default;
var result = stringd(template: string, object: {key: value, ...}, ignore?: string[]);

// ES6
import stringd from 'stringd';
var result = stringd(template: string, object: {key: value, ...}, ignore?: string[]));

API

stringd(<template>, <object>[, ignore])

Parse the template with the variables stated in object, ignore the variables defined in the ignore array

Examples

stringd('Hello :{name}', {name: 'World'});
// Hello World

stringd(':{last}, :{first} :{last}', {last: 'Doe', first: 'John'});
// Doe, John Doe

Features

Multi parse methods

Whichever is more comfortable for you would work just fine

stringd('Hello :{name}', {name: 'World'});  // Hello world
stringd('Hello %{name}', {name: 'World'});  // Hello world
stringd('Hello ${name}', {name: 'World'});  // Hello world
stringd('Hello :{name%}', {name: 'World'}); // Hello world
stringd('Hello %{name%}', {name: 'World'}); // Hello world
stringd('Hello ${name%}', {name: 'World'}); // Hello world

Nesting

assert.equal('John Davis', stringd(':{name}', {
  name: ":{first} :{last}",
  last: "Davis"
  first: "John",
}));

Functional Evaluation

assert.equal(
  'Hello John Davis, you have contributed $585 in the span of 13 months',
  stringd(':{name:parsed}', {
    name: ':{first} :{last}',
    last: 'Davis',
    first: 'John',
    greeting: 'Hello :{name}',
    months: 13,
    duration: ':{months} months',
    contribution: 45,
    // Functions get the entire template object as an argument
    // so you can do advanced processing
    cash: ({contribution, months}) => contribution * months,
    'name:parsed': `:{greeting}, you have contributed $:{cash} in the span of :{duration}`,
  })
);

Forward Padding, Space

assert.equal('   10', stringd(':5{val}', {val: 10}));

End Padding, Space

assert.equal('10   ', stringd(':-5{val}', {val: 10}));

Forward Padding, Zero

assert.equal('00010', stringd(':05{val}', {val: 10}));

End Padding, Zero

assert.equal('10000', stringd(':-05{val}', {val: 10}));

Complex Nesting with exclusive recursion

Recursive nesting is unparsed at the second level, otherwise, it continues until its done parsing the entire string

assert.equal(
  'James:{name} :{name} :{data} :{data} :{all} :{name} :{data}Jack :{data}',
  stringd(':{name} :{misc}', {
    name: ':{first}:{data}:{last}',
    first: 'James',
    last: 'Jack',
    misc: ':{data}',
    data: ':{name} :{all}',
    all: ':{name} :{misc} :{data} :{all} :{name} :{misc}',
  })
);

Development

Tests are executed with Jest. To use it, simple run npm install, it will install Jest and its dependencies in your project's node_modules directory followed by npm test.

To run the tests:

npm install
npm test

JSPM

stringd