misc-utils-of-mine-generic/src/string/template.ts

Miscellaneous utilities for JavaScript/TypeScript that I often use

var cache: any = {}

export function template(str: string, data?: any) {
  // Figure out if we're getting a template, or if we need to
  // load the template - and be sure to cache the result.
  var fn: any = !/\W/.test(str)
    ? (cache[str] = cache[str] || template(str))
    : // Generate a reusable function that will serve as a template
    // generator (and which will be cached).
    new Function(
      'obj',
      'var p=[],print=function(){p.push.apply(p,arguments);};' +
      // Introduce the data as local variables using with(){}
      'with(obj){p.push(\'' +
      // Convert the template into pure JavaScript
      str
        .replace(/[\r\t\n]/g, ' ')
        .split('<%')
        .join('\t')
        .replace(/((^|%>)[^\t]*)'/g, '$1\r')
        .replace(/\t=(.*?)%>/g, '\',$1,\'')
        .split('\t')
        .join('\');')
        .split('%>')
        .join('p.push(\'')
        .split('\r')
        .join('\\\'') +
      '\');}return p.join(\'\');'
    )

  // Provide some basic currying to the user
  return data ? fn(data) : fn
}