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Utility methods for DOM and string parsing
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// ==UserScript==
// @name ParseUtil
// @namespace hoehleg.userscripts.private
// @version 0.1
// @description Utility methods for DOM and string parsing
// @author Gerrit Höhle
// @grant GM_xmlhttpRequest
// ==/UserScript==
/* jshint esnext: true */
const ParseUtil = {
getPageAsync: (url, onSuccess, onError = () => {}) => {
return GM_xmlhttpRequest({
method: 'GET',
url: url,
onload: (resp) => {
resp.html = new DOMParser().parseFromString(resp.responseText || "", 'text/html');
switch (resp.status) {
case 200:
case 304:
onSuccess(resp);
return;
default:
onError(resp);
return;
}
},
onerror: onError
});
},
parseInt: (str, maxIntPlaces = 1, fallbackValue = null) => {
let regex = "\\d";
if (maxIntPlaces > 1) {
regex += "{1," + maxIntPlaces + "}";
}
return Util.parseIntWithRegex(str, new RegExp(regex), fallbackValue);
},
parseFloat: (str, maxIntPlaces = 1, maxDecPlaces = 0, fallbackValue = null) => {
let regex = "\\d";
if (maxIntPlaces > 1) {
regex += "{1," + maxIntPlaces + "}";
}
if (maxDecPlaces > 0) {
regex += "\\s?[,\.]?\\s?\\d{0," + maxDecPlaces + "}";
}
return Util.parseFloatWithRegex(str, new RegExp(regex), fallbackValue);
},
parseIntWithRegex: (str, regex, fallbackValue = null) => {
const match = Util.parseStrWithRegex(str, regex);
const value = parseInt(match);
return Number.isNaN(value) ? fallbackValue : value;
},
parseFloatWithRegex: (str, regex, fallbackValue = null) => {
const match = Util.parseStrWithRegex(str, regex, "").replace(",",".");
const value = parseFloat(match);
return Number.isNaN(value) ? fallbackValue : value;
},
parseStrWithRegex: (str, regex, fallbackValue = null) => {
const match = regex.exec(str || "");
return (match && match.length >= 1) ? match[0] : fallbackValue;
}
};