htmlhint/dist/core/rules/attr-value-no-duplication.js

The Static Code Analysis Tool for your HTML

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.default = {
    id: 'attr-value-no-duplication',
    description: 'Class attributes should not contain duplicate values. Other attributes can be checked via configuration.',
    init(parser, reporter, options) {
        const defaultAttributesToCheck = ['class'];
        const attributesToCheck = Array.isArray(options)
            ? options
            : defaultAttributesToCheck;
        parser.addListener('tagstart', (event) => {
            const attrs = event.attrs;
            let attr;
            const col = event.col + event.tagName.length + 1;
            for (let i = 0, l = attrs.length; i < l; i++) {
                attr = attrs[i];
                const attrName = attr.name.toLowerCase();
                if (!attributesToCheck.includes(attrName)) {
                    continue;
                }
                if (!attr.value || !/\s/.test(attr.value)) {
                    continue;
                }
                const values = attr.value.trim().split(/\s+/);
                const duplicateMap = {};
                for (const value of values) {
                    if (value && duplicateMap[value] === true) {
                        reporter.error(`Duplicate value [ ${value} ] was found in attribute [ ${attr.name} ].`, event.line, col + attr.index, this, attr.raw);
                        break;
                    }
                    duplicateMap[value] = true;
                }
            }
        });
    },
};
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