site-metadata-extractor
Version:
web(site) resource metadata extractor
185 lines • 23.5 kB
JavaScript
;
var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.ulToText = exports.replaceWithText = exports.replaceCharacters = exports.removeNegativescoresNodes = exports.removeFewWordsParagraphs = exports.linksToText = exports.convertToText = exports.cleanParagraphText = exports.addNewlineToBr = void 0;
const xregexp_1 = __importDefault(require("xregexp"));
const stopwords_1 = __importDefault(require("./stopwords"));
function getTagName(node) {
const element = node.get(0);
return (element === null || element === void 0 ? void 0 : element.tagName) || "";
}
const addNewlineToBr = (doc, topNode) => {
const brs = topNode.find("br");
brs.each((_index, element) => {
const br = doc(element);
br.replaceWith("\n\n");
});
return doc;
};
exports.addNewlineToBr = addNewlineToBr;
const cleanParagraphText = (rawText) => {
const text = rawText.trim();
text.replace(/[\s\t]+/g, " ");
return text;
};
exports.cleanParagraphText = cleanParagraphText;
const convertToText = (doc, topNode) => {
let texts = [];
const nodes = topNode.contents();
let hangingText = "";
nodes.each((_index, element) => {
const node = doc(element);
const firstNode = node.get(0);
const nodeType = firstNode ? firstNode.type : null;
const nodeName = getTagName(node);
if (nodeType === "text") {
hangingText += node.text();
return true;
}
else if (nodeName === "ul") {
hangingText += (0, exports.ulToText)(doc, node);
return true;
}
if (hangingText.length > 0) {
const txt = (0, exports.cleanParagraphText)(hangingText);
texts = texts.concat(txt.split(/\r?\n/));
hangingText = "";
}
let text = (0, exports.cleanParagraphText)(node.text());
text = text.replace(/(\w+\.)([A-Z]+)/, "$1 $2");
texts = texts.concat(text.split(/\r?\n/));
});
if (hangingText.length > 0) {
const text = (0, exports.cleanParagraphText)(hangingText);
texts = texts = texts.concat(text.split(/\r?\n/));
}
texts = texts.map((txt) => {
return txt.trim();
});
const regex = (0, xregexp_1.default)("[\\p{Number}\\p{Letter}]");
texts = texts.filter((txt) => {
return regex.test(txt);
});
return texts.join("\n\n");
};
exports.convertToText = convertToText;
const linksToText = (doc, topNode) => {
const nodes = topNode.find("a");
nodes.each((_index, element) => {
const htmlEl = doc(element).html();
if (htmlEl) {
doc(element).replaceWith(htmlEl);
}
});
return doc;
};
exports.linksToText = linksToText;
const removeFewWordsParagraphs = (doc, topNode, lang) => {
const allNodes = topNode.find("*");
allNodes.each((_index, element) => {
const el = doc(element);
const tag = getTagName(el);
const text = el.text();
const stopWords = (0, stopwords_1.default)(text, lang);
if ((tag !== "br" || text !== "\\r") &&
stopWords.stopWordCount < 3 &&
el.find("object").length === 0 &&
el.find("embed").length === 0) {
doc(el).remove();
}
else {
const trimmed = text.trim();
if (trimmed[0] === "(" && trimmed[trimmed.length - 1] === ")") {
doc(el).remove();
}
}
});
return doc;
};
exports.removeFewWordsParagraphs = removeFewWordsParagraphs;
const removeNegativescoresNodes = (doc, topNode) => {
const gravityItems = topNode.find("*[gravityScore]");
gravityItems.each((_index, element) => {
let score = 0;
const item = doc(element);
const gravityScore = item.attr("gravityScore");
if (gravityScore) {
score = parseInt(gravityScore, 10) || 0;
}
if (score < 1) {
doc(item).remove();
}
});
return doc;
};
exports.removeNegativescoresNodes = removeNegativescoresNodes;
const replaceCharacters = (text, html, chars) => {
let processedText = text;
// if element does not match any in map and starts with & and ends with ;, replace with empty string
const htmlEntities = {
"&": "&",
"'": "'",
"¢": "¢",
"©": "©",
"€": "€",
">": ">",
"<": "<",
" ": " ",
"£": "£",
""": '"',
"®": "®",
"¥": "¥",
};
const escapeChars = {
'"': '"',
"'": "'",
// tslint:disable-next-line: object-literal-sort-keys
"\n": " ",
"\r": " ",
};
if (html) {
for (const key of Object.keys(htmlEntities)) {
const htmlregex = new RegExp(key, "g");
processedText = processedText.replace(htmlregex, htmlEntities[key]);
}
}
if (chars) {
for (const key of Object.keys(escapeChars)) {
const escapeCharsRegex = new RegExp(key, "g");
processedText = processedText.replace(escapeCharsRegex, escapeChars[key]);
}
}
return processedText;
};
exports.replaceCharacters = replaceCharacters;
const replaceWithText = (doc, topNode) => {
const nodes = topNode.find("b, strong, i, br, sup");
nodes.each((_index, element) => {
doc(element).replaceWith(doc(element).text());
});
return doc;
};
exports.replaceWithText = replaceWithText;
const ulToText = (doc, node) => {
const nodes = node.find("li");
let text = "";
nodes.each((_index, element) => {
text = `${text}\n * ${doc(element).text()}`;
});
text = `${text}\n`;
return text;
};
exports.ulToText = ulToText;
const formatter = (doc, topNode, lang) => {
(0, exports.removeNegativescoresNodes)(doc, topNode);
(0, exports.linksToText)(doc, topNode);
(0, exports.addNewlineToBr)(doc, topNode);
(0, exports.replaceWithText)(doc, topNode);
(0, exports.removeFewWordsParagraphs)(doc, topNode, lang);
const convertedText = (0, exports.convertToText)(doc, topNode).replace(/\n/g, " ");
return (0, exports.replaceCharacters)(convertedText, false, true);
};
exports.default = formatter;
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type { Cheerio, CheerioAPI } from \"cheerio\";\nimport type { AnyNode, Element } from \"domhandler\";\nimport xregexp from \"xregexp\";\nimport stopwords from \"./stopwords\";\n\nfunction getTagName(node: Cheerio<AnyNode>): string {\n  const element = node.get(0) as Element | undefined;\n  return element?.tagName || \"\";\n}\n\nexport const addNewlineToBr = (\n  doc: CheerioAPI,\n  topNode: Cheerio<AnyNode>,\n): CheerioAPI => {\n  const brs = topNode.find(\"br\");\n\n  brs.each((_index: number, element: AnyNode) => {\n    const br = doc(element);\n    br.replaceWith(\"\\n\\n\");\n  });\n\n  return doc;\n};\n\nexport const cleanParagraphText = (rawText: string): string => {\n  const text = rawText.trim();\n  text.replace(/[\\s\\t]+/g, \" \");\n  return text;\n};\n\nexport const convertToText = (\n  doc: CheerioAPI,\n  topNode: Cheerio<AnyNode>,\n): string => {\n  let texts: string[] = [];\n  const nodes = topNode.contents();\n\n  let hangingText = \"\";\n\n  nodes.each((_index: number, element: AnyNode) => {\n    const node = doc(element);\n    const firstNode = node.get(0);\n    const nodeType = firstNode ? firstNode.type : null;\n    const nodeName = getTagName(node);\n\n    if (nodeType === \"text\") {\n      hangingText += node.text();\n      return true;\n    } else if (nodeName === \"ul\") {\n      hangingText += ulToText(doc, node);\n      return true;\n    }\n\n    if (hangingText.length > 0) {\n      const txt = cleanParagraphText(hangingText);\n      texts = texts.concat(txt.split(/\\r?\\n/));\n      hangingText = \"\";\n    }\n\n    let text = cleanParagraphText(node.text());\n    text = text.replace(/(\\w+\\.)([A-Z]+)/, \"$1 $2\");\n    texts = texts.concat(text.split(/\\r?\\n/));\n  });\n\n  if (hangingText.length > 0) {\n    const text = cleanParagraphText(hangingText);\n    texts = texts = texts.concat(text.split(/\\r?\\n/));\n  }\n\n  texts = texts.map((txt) => {\n    return txt.trim();\n  });\n\n  const regex = xregexp(\"[\\\\p{Number}\\\\p{Letter}]\");\n  texts = texts.filter((txt) => {\n    return regex.test(txt);\n  });\n\n  return texts.join(\"\\n\\n\");\n};\n\nexport const linksToText = (\n  doc: CheerioAPI,\n  topNode: Cheerio<AnyNode>,\n): CheerioAPI => {\n  const nodes = topNode.find(\"a\");\n  nodes.each((_index: number, element: AnyNode) => {\n    const htmlEl = doc(element).html();\n    if (htmlEl) {\n      doc(element).replaceWith(htmlEl);\n    }\n  });\n  return doc;\n};\n\nexport const removeFewWordsParagraphs = (\n  doc: CheerioAPI,\n  topNode: Cheerio<AnyNode>,\n  lang: string,\n): CheerioAPI => {\n  const allNodes = topNode.find(\"*\");\n\n  allNodes.each((_index: number, element: AnyNode) => {\n    const el = doc(element);\n    const tag = getTagName(el);\n    const text = el.text();\n\n    const stopWords = stopwords(text, lang);\n    if (\n      (tag !== \"br\" || text !== \"\\\\r\") &&\n      stopWords.stopWordCount < 3 &&\n      el.find(\"object\").length === 0 &&\n      el.find(\"embed\").length === 0\n    ) {\n      doc(el).remove();\n    } else {\n      const trimmed = text.trim();\n      if (trimmed[0] === \"(\" && trimmed[trimmed.length - 1] === \")\") {\n        doc(el).remove();\n      }\n    }\n  });\n\n  return doc;\n};\n\nexport const removeNegativescoresNodes = (\n  doc: CheerioAPI,\n  topNode: Cheerio<AnyNode>,\n): CheerioAPI => {\n  const gravityItems = topNode.find(\"*[gravityScore]\");\n\n  gravityItems.each((_index: number, element: AnyNode) => {\n    let score = 0;\n    const item = doc(element);\n    const gravityScore = item.attr(\"gravityScore\");\n    if (gravityScore) {\n      score = parseInt(gravityScore, 10) || 0;\n    }\n\n    if (score < 1) {\n      doc(item).remove();\n    }\n  });\n\n  return doc;\n};\n\nexport const replaceCharacters = (\n  text: string,\n  html: boolean,\n  chars: boolean,\n): string => {\n  let processedText = text;\n  // if element does not match any in map and starts with & and ends with ;, replace with empty string\n  const htmlEntities: Record<string, string> = {\n    \"&amp;\": \"&\",\n    \"&apos;\": \"'\",\n    \"&cent;\": \"¢\",\n    \"&copy;\": \"©\",\n    \"&euro;\": \"€\",\n    \"&gt;\": \">\",\n    \"&lt;\": \"<\",\n    \"&nbsp;\": \" \",\n    \"&pound;\": \"£\",\n    \"&quot;\": '\"',\n    \"&reg;\": \"®\",\n    \"&yen;\": \"¥\",\n  };\n\n  const escapeChars: Record<string, string> = {\n    '\"': '\"',\n    \"'\": \"'\",\n    // tslint:disable-next-line: object-literal-sort-keys\n    \"\\n\": \" \",\n    \"\\r\": \" \",\n  };\n\n  if (html) {\n    for (const key of Object.keys(htmlEntities)) {\n      const htmlregex = new RegExp(key, \"g\");\n      processedText = processedText.replace(htmlregex, htmlEntities[key]);\n    }\n  }\n\n  if (chars) {\n    for (const key of Object.keys(escapeChars)) {\n      const escapeCharsRegex = new RegExp(key, \"g\");\n      processedText = processedText.replace(escapeCharsRegex, escapeChars[key]);\n    }\n  }\n\n  return processedText;\n};\n\nexport const replaceWithText = (\n  doc: CheerioAPI,\n  topNode: Cheerio<AnyNode>,\n): CheerioAPI => {\n  const nodes = topNode.find(\"b, strong, i, br, sup\");\n  nodes.each((_index: number, element: AnyNode) => {\n    doc(element).replaceWith(doc(element).text());\n  });\n  return doc;\n};\n\nexport const ulToText = (doc: CheerioAPI, node: Cheerio<AnyNode>): string => {\n  const nodes = node.find(\"li\");\n  let text = \"\";\n\n  nodes.each((_index: number, element: AnyNode) => {\n    text = `${text}\\n * ${doc(element).text()}`;\n  });\n  text = `${text}\\n`;\n  return text;\n};\n\nconst formatter = (\n  doc: CheerioAPI,\n  topNode: Cheerio<AnyNode>,\n  lang: string,\n): string => {\n  removeNegativescoresNodes(doc, topNode);\n  linksToText(doc, topNode);\n  addNewlineToBr(doc, topNode);\n  replaceWithText(doc, topNode);\n  removeFewWordsParagraphs(doc, topNode, lang);\n  const convertedText = convertToText(doc, topNode).replace(/\\n/g, \" \");\n  return replaceCharacters(convertedText, false, true);\n};\n\nexport default formatter;\n"]}