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SassMeister-input.scss

// ----
// libsass (v3.2.5)
// ----

/// Replace `$search` with `$replace` in `$string`
/// @author Hugo Giraudel
/// @link http://sassmeister.com/gist/1b4f2da5527830088e4d Original gist
/// @param {String} $string - Initial string
/// @param {String} $search - Substring to replace
/// @param {String} $replace ('') - New value
/// @return {String} - Updated string
@function str-replace($string, $search, $replace: '') {
  $index: str-index($string, $search);
  
  @if $index {
    @return str-slice($string, 1, $index - 1) + $replace + str-replace(str-slice($string, $index + str-length($search)), $search, $replace);
  }
  
  @return $string;
}

/// Micro-templating function in Sass; replace tokens in `$template` with their value in `$data`
/// @author Hugo Giraudel
/// @param {String} $template - The template string containing tokens wrapped in double braces
/// @param {Map} $data - The data to be injected in place of the tokens
/// @return {String}
/// @example scss
///   $template: 'Hello {{addressee}}! I’m {{sender}}.';
///   $data: ('addressee': 'world', 'sender': 'Hugo');
///   $foo: template($template, $data);
///   // $foo -> "Hello world! I’m Hugo."
@function template($template, $data) {
  @each $key, $value in $data {
    $token: '{{#{$key}}}';
    $tmpl: $template;
    $template: str-replace($template, $token, inspect($value));

    @if $template == $tmpl {
      @warn 'The token `#{$token}` cannot be found in the template string.';
    }
  }
  
  @return $template;
}

// -------
// Example
// -------

$template: 'Hello {{addressee}}! I’m {{sender}}.';
$data: (
  'addressee': 'world',
  'sender': 'Hugo',
);

.test {
  content: template($template, $data);
}

SassMeister-output.css

@charset "UTF-8";
.test {
  content: "Hello world! I’m Hugo.";
}