提取选中词所在句子
This script should not be not be installed directly. It is a library for other scripts to include with the meta directive // @require https://update.greasyfork.org/scripts/534393/1605572/extractsentence.js
// altered from https://github.com/ninja33/ODH/blob/master/src/fg/js/text.js
;const {
getSentence, calSentence, cutSentence, escapeRegExp
} = (() => {
const HtmlTagsToReplace = {
'&': '&',
'<': '<',
'>': '>'
};
function replaceHtmlTag(tag) {
return HtmlTagsToReplace[tag] || tag;
}
function escapeHtmlTag(string) {
return string.replace(/[&<>]/g, replaceHtmlTag);
}
function escapeRegExp(string) {
return string.replace(/[.*+?^${}()|[\]\\]/g, '\\$&'); // $& means the whole matched string
}
// peculiarly, it's will change unsafeWindow's String replaceAll if not rename
String.prototype.replaceAllX = function (search, replacement, flag = 'g') {
let target = this;
search = escapeRegExp(search);
return target.replace(new RegExp(search, flag), replacement);
};
String.prototype.searchAll = function (search) {
let target = this;
search = escapeRegExp(search);
let regex = new RegExp(search, 'gi');
let result = 0;
let indices = [];
while ((result = regex.exec(target)) && result) {
indices.push(result.index);
}
return indices;
};
function isPDFJSPage() {
return (document.querySelectorAll('div#viewer.pdfViewer,pdf-viewer#viewer').length > 0);
}
function isEmpty(word) {
return (!word);
}
function isShortandNum(word) {
let numReg = /\d/;
return (word.length < 3 || numReg.test(word));
}
function isChinese(word) {
let cnReg = /[\u4e00-\u9fa5]+/gi;
return (cnReg.test(word));
}
function isInvalid(word) {
if (isChinese(word)) return false;
return (isChinese(word) && isEmpty(word) || isShortandNum(word));
}
function cutSentence(word, offset, sentence, sentenceNum, wordFormat, sentenceFormat) {
if (!word) {
return '';
}
if (!wordFormat) {
wordFormat = '<b>{$bold}</b>';
}
if (!sentenceFormat) {
sentenceFormat = '{$sentence}';
}
wordFormat = wordFormat.split('{$bold}').join('\$&');
if (sentenceNum > 0) {
let arr = sentence.match(/((?![.!?;:。！？]['"’”]?\s).|\n)*[.!?;:。！？]['"’”]?(\s|.*$)/g);
if (arr && arr.length > 1) {
arr = arr.reduceRight((accumulation, current) => {
if (current.search(/\.\w{0,3}\.\s$/g) !== -1) {
accumulation[0] = current + accumulation[0];
} else {
accumulation.unshift(current);
}
return accumulation;
}, ['']);
arr = arr.filter(x => x.length);
} else {
arr = [sentence];
}
let index = arr.findIndex(ele => { //try to exactly match to word based on offset.
if (ele.indexOf(word) !== -1 && ele.searchAll(word).indexOf(offset) !== -1)
return true;
else
offset -= ele.length;
});
if (index === -1) // fallback if can not exactly find word.
index = arr.findIndex(ele => ele.indexOf(word) !== -1);
let left = Math.ceil((sentenceNum - 1) / 2);
let start = index - left;
let end = index + ((sentenceNum - 1) - left);
if (start < 0) {
start = 0;
end = sentenceNum - 1;
} else if (end > (arr.length - 1)) {
end = arr.length - 1;
if ((end - (sentenceNum - 1)) < 0) {
start = 0;
} else {
start = end - (sentenceNum - 1);
}
}
sentence = arr.slice(start, end + 1).join('').replaceAllX(word, word.replace(/\S+/g, wordFormat), 'gi');
} else {
sentence = sentence.replace(word, word.replace(/\S+/g, wordFormat));
}
return sentenceFormat.replaceAll('{$sentence}', sentence);
}
function getSelectionOffset(node) {
const range = window.getSelection().getRangeAt(0);
const clone = range.cloneRange();
clone.selectNodeContents(node);
clone.setEnd(range.startContainer, range.startOffset);
let start = clone.toString().length;
clone.setEnd(range.endContainer, range.endOffset);
let end = clone.toString().length;
return {start, end};
}
function getPDFNode(node) {
let backwardindex = 0;
do {
node = node.parentNode;
} while (node.name && node.nodeName.toUpperCase() !== 'SPAN' && node.nodeName.toUpperCase() !== 'DIV');
let currentspan = node;
let sentenceNodes = [currentspan];
let previous = null;
while ((previous = node.previousSibling)) {
sentenceNodes.unshift(previous);
backwardindex += 1;
if (previous.textContent.search(/[.!?;:。！？]['"’”]?(\s|.*$)/g) !== -1)
break;
else
node = previous;
}
node = currentspan;
let next = null;
while ((next = node.nextSibling)) {
sentenceNodes.push(next);
if (node.nextSibling.textContent.search(/[.!?;:。！？]['"’”]?(\s|.*$)/g) !== -1)
break;
else
node = next;
}
let sentence = '';
let offset = 0;
sentenceNodes = sentenceNodes.filter(x => x.textContent !== '' || x.textContent !== '-');
for (const node of sentenceNodes) {
if (backwardindex === 0)
offset = sentence.length + window.getSelection().getRangeAt(0).startOffset;
backwardindex -= 1;
let nodetext = node.textContent;
if (nodetext === '-')
sentence = sentence.slice(0, sentence.length - 1);
else
sentence += (nodetext[nodetext.length - 1] === '-') ? nodetext.slice(0, nodetext.length - 1) : nodetext + ' ';
}
return {sentence, offset};
}
function calSentence() {
let sentence = '';
let offset = 0;
const upNum = 4;
const selection = window.getSelection();
let word = (selection.toString() || '').trim();
const res = {sentence, offset, word}
if (selection.rangeCount < 1)
return res;
let node = selection.getRangeAt(0).commonAncestorContainer;
if (['INPUT', 'TEXTAREA'].indexOf(node.tagName) !== -1) {
return res;
}
if (isPDFJSPage()) {
let pdfcontext = getPDFNode(node);
sentence = escapeHtmlTag(pdfcontext.sentence);
offset = pdfcontext.offset;
} else {
node = getWebNode(node, upNum);
if (node !== document) {
sentence = escapeHtmlTag(node.textContent);
offset = getSelectionOffset(node).start;
}
}
return {sentence, offset, word}
}
function getSentence(sentenceNum, wordFormat, sentenceFormat) {
const {word, offset, sentence} = calSentence()
if (word === '') {
return '';
}
return cutSentence(word, offset, sentence, sentenceNum, wordFormat, sentenceFormat);
}
function getWebNode(node, deep) {
const blockTags = ['LI', 'P', 'DIV', 'BODY', 'PRE', 'CODE'];
const nodeName = node.nodeName.toUpperCase();
if (blockTags.includes(nodeName) || deep === 0) {
return node;
} else {
return getWebNode(node.parentElement, deep - 1);
}
}
function selectedText() {
const selection = window.getSelection();
return (selection.toString() || '').trim();
}
function isValidElement() {
// if (document.activeElement.getAttribute('contenteditable'))
// return false;
const invalidTags = ['INPUT', 'TEXTAREA'];
const nodeName = document.activeElement.nodeName.toUpperCase();
return !invalidTags.includes(nodeName);
}
return {
getSentence, calSentence, cutSentence, escapeRegExp
}
})();