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highlight-search.js
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highlight-search.js
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/*
* coding=utf-8
* Copyright 2021-present, the Recognai S.L. team.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
export default (context, inject) => {
const highlightKeywords = function (text, keywords) {
const sortedKeywords = sortByLength([...keywords]);
const pattern = sortedKeywords.map((keyword) => createPattern(keyword));
const regExp = createRegExp(pattern.join("|"));
return replaceText(regExp, text);
};
const keywordsSpans = function (text, keywords) {
return (keywords || []).flatMap((keyword) => {
const regex = createRegExp(createPattern(keyword));
return [...text.matchAll(regex)].map((match) => {
return {
start: match.index,
end: match.index + match[0].length,
};
});
});
};
function sortByLength(keywords) {
return (keywords || []).sort((a, b) => b.length - a.length);
}
function createPattern(value) {
return `([^a-zA-ZÀ-ÿ\u00f1\u00d1]|^)${escapeRegExp(value)}`;
}
const escapeRegExp = function (text) {
return text.replace(/[-[\]{}()*+?.,\\^$|#\s]/g, "\\$&");
};
function createRegExp(pattern) {
return new RegExp(pattern, "gmi");
}
function replaceText(regex, text) {
return htmlText(text).replace(regex, (matched) =>
matched ? htmlHighlightText(matched) : matched
);
}
function htmlHighlightText(text) {
return `<span class="highlight-text">${htmlText(text)}</span>`;
}
const htmlText = function (text) {
return text
.toString()
.replace(/&/g, "&")
.replace(/</g, "<")
.replace(/>/g, ">")
.replace(/"/g, """);
};
inject("highlightKeywords", highlightKeywords);
inject("keywordsSpans", keywordsSpans);
inject("htmlText", htmlText);
inject("htmlHighlightText", htmlHighlightText);
};