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const HtmlDiffer = require('@markedjs/html-differ').HtmlDiffer;
const htmlDiffer = new HtmlDiffer({ignoreSelfClosingSlash: true});
module.exports = {
isEqual: htmlDiffer.isEqual.bind(htmlDiffer),
firstDiff: (actual, expected, padding) => {
padding = padding || 30;
const result = htmlDiffer
.diffHtml(actual, expected)
.reduce((obj, diff) => {
if (diff.added) {
if (obj.firstIndex === null) {
obj.firstIndex = obj.expected.length;
}
obj.expected += diff.value;
} else if (diff.removed) {
if (obj.firstIndex === null) {
obj.firstIndex = obj.actual.length;
}
obj.actual += diff.value;
} else {
obj.actual += diff.value;
obj.expected += diff.value;
}
return obj;
}, {
firstIndex: null,
actual: '',
expected: ''
});
return {
actual: result.actual.substring(result.firstIndex - padding, result.firstIndex + padding),
expected: result.expected.substring(result.firstIndex - padding, result.firstIndex + padding)
};
}
};
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