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Remove unused
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@@ -1,98 +0,0 @@
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import React from 'react';
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import { matchLinks } from './index';
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import memoize from 'lodash/memoize';
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function escapeRegExp(string) {
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return string.replace(/[.*+?^${}()|[\]\\]/g, '\\$&'); // $& means the whole matched string
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}
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// generate a regulare expression that catches the `phrases`.
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function generateRegExp(phrases) {
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const inner = phrases
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.map(phrase =>
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phrase
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.split(/\s+/)
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.map(word => escapeRegExp(word))
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.join('[\\s"?!.]+')
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)
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.join('|');
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const pattern = `(^|[^\\w])(${inner})(?=[^\\w]|$)`;
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try {
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return new RegExp(pattern, 'iu');
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} catch (_err) {
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// IE does not support unicode support, so we'll create one without.
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return new RegExp(pattern, 'i');
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}
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}
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// Generate a regular expression detecting `suspectWords` and `bannedWords` phrases.
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function getPhrasesRegexp(suspectWords, bannedWords) {
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return generateRegExp([...suspectWords, ...bannedWords]);
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}
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// Memoized version as arguments rarely change.
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const getPhrasesRegexpMemoized = memoize(getPhrasesRegexp);
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function nl2br(body, keyPrefix) {
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const tokens = body.split('\n').reduce((tokens, t, i) => {
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if (i !== 0) {
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tokens.push(<br key={`${keyPrefix}_${i}`} />);
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}
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tokens.push(t);
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return tokens;
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}, []);
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return tokens;
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}
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// markPhrases looks for `supsectWords` and `bannedWords` inside `body` and highlights them by returning
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// an array of React Elements.
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function markPhrases(body, suspectWords, bannedWords, keyPrefix) {
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const regexp = getPhrasesRegexpMemoized(suspectWords, bannedWords);
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const tokens = body.split(regexp);
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return tokens.map(
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(token, i) =>
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i % 3 === 2 ? <mark key={`${keyPrefix}_${i}`}>{token}</mark> : token
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);
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}
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// markLinks looks for links inside `body` and highlights them by returning
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// an array of React Elements.
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function markLinks(body, keyPrefix) {
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const matches = matchLinks(body);
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const content = [];
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let index = 0;
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if (matches) {
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matches.forEach((match, i) => {
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content.push(body.substring(index, match.index));
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content.push(
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<mark key={`${keyPrefix}_${i}`}>
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<a href={match.url} target="_blank">
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{match.text}
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</a>
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</mark>
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);
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index = match.lastIndex;
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});
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}
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content.push(body.substring(index));
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return content;
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}
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export function renderText(body, suspectWords, bannedWords) {
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return nl2br(body).map((element, index) => {
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// Skip br tags.
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if (typeof element !== 'string') {
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return element;
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}
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return markLinks(element, index).map((element, index) => {
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// Keep highlighted links.
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if (typeof element !== 'string') {
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return element;
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}
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// Highlight suspect and banned phrase inside this part of text.
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return markPhrases(element, suspectWords, bannedWords, index);
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});
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});
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}
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