sprintf-ext-string

String formatting extension for sprintf-js

Overview

It's the very experimental module to try the new feature that proposed to sprintf-js by me.

This feature allow to use an user defined type specifiers (any letter) and bind such specifier with an user defined function. This function will be called inside sprintf to format sprintf arguments according desired specification. An additional formatting modifiers may be passed in the sprintf format string if need.

You can use any existing formatting features of sprintf together with such user defined type specifiers (width, precision, padding and aligning). They will by applied to result of user function.

Getting Started

Install featured sprintf-js:

npm install https://github.com/litmit/sprintf.js.git#expandable

Install this extension:

npm install sprintf-ext-string

Now you can code:

var sprintf = require("sprintf-js").sprintf;
require("sprintf-ext-string").bind(sprintf);

var user = { name: "DoLly mollY" };

console.log(sprintf("Hello %(name)-11.5S", user));    // --> Hello DOLLY 
console.log(sprintf("Hello %(name)-11.5[U]S", user)); // --> Hello DOLLY 
console.log(sprintf("Hello %(name)11.5[l]S", user));  // --> Hello       dolly
console.log(sprintf("Hello %(name)11.5[]S", user));   // --> Hello       DoLly

console.log(sprintf("Hello %1$[l]S", user.name));     // --> Hello dolly molly
console.log(sprintf("Hello %1$[C]S", user.name));     // --> Hello DoLly MollY
console.log(sprintf("Hello %1$[Cl]S", user.name));    // --> Hello Dolly Molly

console.log(sprintf("Hello %[F]S", user.name));       // --> Hello DoLly mollY
console.log(sprintf("Hello %[f]S", user.name));       // --> Hello doLly mollY

console.log(sprintf("Hello %[Fl]S", user.name));      // --> Hello Dolly molly
console.log(sprintf("Hello %[fU]S", user.name));      // --> Hello dOLLY MOLLY

String formatting modifiers

• %S or %[U]S - now yields a string in UPPER CASE
• %[]S - yields a string as is (like %s)
• %[l]S - now yields a string in lower case
• %[F]S - now yields a string with first letter in Upper case
• %[f]S - now yields a string with first letter in lower case
• %[Fl]S - now yields a string with first letter in Upper case and others in Lower case
• %[fU]S - now yields a string with first letter in lower case and others in uPPER CASE
• %[C]S - now yields a string with first letter in each word in Upper Case
• %[Cl]S - now yields a string with first letter in each word in Upper Case and others in Lower case