text: var parser = require('postcss-value-parser');
  var keywords = require('./keywords');
  var minifyFamily = require('./minify-family');
  var minifyWeight = require('./minify-weight');
  
  module.exports = function (nodes, opts) {
      var i, max, node, familyStart, family;
      var hasSize = false;
  
      for (i = 0, max = nodes.length; i < max; i += 1) {
          node = nodes[i];
          if (node.type === 'word') {
              if (node.value === 'normal' ||
                  ~keywords.style.indexOf(node.value) ||
                  ~keywords.variant.indexOf(node.value) ||
                  ~keywords.stretch.indexOf(node.value)) {
                  if (!hasSize) {
                      familyStart = i;
                  }
              } else if (~keywords.weight.indexOf(node.value)) {
                  if (!hasSize) {
                      node.value = minifyWeight(node.value, opts);
                      familyStart = i;
                  }
              } else if (~keywords.size.indexOf(node.value) || parser.unit(node.value)) {
                  if (!hasSize) {
                      familyStart = i;
                      hasSize = true;
                  }
              }
          } else if (node.type === 'div') {
              node.before = '';
              node.after = '';
              if (node.value === '/') {
                  familyStart = i + 1;
              }
              break;
          } else if (node.type === 'space') {
              node.value = ' ';
          }
      }
  
      if (!isNaN(familyStart)) {
          familyStart += 2;
          family = minifyFamily(nodes.slice(familyStart), opts);
          nodes = nodes.slice(0, familyStart).concat(family);
      }
  
      return nodes;
  };
  