react-saasify-chrisvxd/example/node_modules/htmlnano/lib/modules/deduplicateAttributeValues.js

React components for Saasify web clients.

'use strict';

Object.defineProperty(exports, "__esModule", {
    value: true
});
exports.default = collapseAttributeWhitespace;

var _collapseAttributeWhitespace = require('./collapseAttributeWhitespace');

/** Deduplicate values inside list-like attributes (e.g. class, rel) */
function collapseAttributeWhitespace(tree) {
    tree.walk(function (node) {
        if (!node.attrs) {
            return node;
        }

        Object.keys(node.attrs).forEach(function (attrName) {
            var attrNameLower = attrName.toLowerCase();
            if (!_collapseAttributeWhitespace.attributesWithLists.has(attrNameLower)) {
                return;
            }

            var attrValues = node.attrs[attrName].split(/\s/);
            var uniqeAttrValues = new Set();
            var deduplicatedAttrValues = [];
            attrValues.forEach(function (attrValue) {
                if (!attrValue) {
                    // Keep whitespaces
                    deduplicatedAttrValues.push('');
                    return;
                }

                if (uniqeAttrValues.has(attrValue)) {
                    return;
                }

                deduplicatedAttrValues.push(attrValue);
                uniqeAttrValues.add(attrValue);
            });

            node.attrs[attrName] = deduplicatedAttrValues.join(' ');
        });

        return node;
    });

    return tree;
}