108 lines
2.6 KiB
JavaScript
108 lines
2.6 KiB
JavaScript
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/*
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* Utils functions
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*
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*/
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var crypt = require('crypto');
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/**
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* Break string str each maxLen symbols
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* @param str
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* @param maxLen
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* @returns {string}
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*/
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module.exports.linebrk = function (str, maxLen) {
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var res = '';
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var i = 0;
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while (i + maxLen < str.length) {
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res += str.substring(i, i + maxLen) + "\n";
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i += maxLen;
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}
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return res + str.substring(i, str.length);
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};
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module.exports.detectEnvironment = function () {
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if (typeof(window) !== 'undefined' && window && !(process && process.title === 'node')) {
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return 'browser';
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}
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return 'node';
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};
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/**
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* Trying get a 32-bit unsigned integer from the partial buffer
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* @param buffer
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* @param offset
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* @returns {Number}
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*/
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module.exports.get32IntFromBuffer = function (buffer, offset) {
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offset = offset || 0;
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var size = 0;
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if ((size = buffer.length - offset) > 0) {
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if (size >= 4) {
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return buffer.readUInt32BE(offset);
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} else {
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var res = 0;
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for (var i = offset + size, d = 0; i > offset; i--, d += 2) {
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res += buffer[i - 1] * Math.pow(16, d);
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}
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return res;
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}
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} else {
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return NaN;
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}
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};
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module.exports._ = {
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isObject: function (value) {
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var type = typeof value;
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return !!value && (type == 'object' || type == 'function');
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},
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isString: function (value) {
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return typeof value == 'string' || value instanceof String;
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},
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isNumber: function (value) {
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return typeof value == 'number' || !isNaN(parseFloat(value)) && isFinite(value);
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},
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/**
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* Returns copy of `obj` without `removeProp` field.
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* @param obj
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* @param removeProp
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* @returns Object
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*/
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omit: function (obj, removeProp) {
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var newObj = {};
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for (var prop in obj) {
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if (!obj.hasOwnProperty(prop) || prop === removeProp) {
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continue;
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}
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newObj[prop] = obj[prop];
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}
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return newObj;
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}
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};
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/**
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* Strips everything around the opening and closing lines, including the lines
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* themselves.
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*/
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module.exports.trimSurroundingText = function (data, opening, closing) {
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var trimStartIndex = 0;
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var trimEndIndex = data.length;
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var openingBoundaryIndex = data.indexOf(opening);
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if (openingBoundaryIndex >= 0) {
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trimStartIndex = openingBoundaryIndex + opening.length;
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}
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var closingBoundaryIndex = data.indexOf(closing, openingBoundaryIndex);
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if (closingBoundaryIndex >= 0) {
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trimEndIndex = closingBoundaryIndex;
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}
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return data.substring(trimStartIndex, trimEndIndex);
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}
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