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Light weight CSV paser function that works in old versions of JavaScript
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| /** | |
| * parseCSV | |
| * Light weight CSV paser function that works in old versions of JavaScript | |
| * @version 1.0.0 | |
| * @author McShaman | |
| * @licence MIT | |
| */ | |
| (function(window) { | |
| 'use strict'; | |
| /** | |
| * The main parser function | |
| * @param {string} dat - CSV data | |
| * @param {Object} ops - Options | |
| * @param {boolean} [ops.headerRow=false] - Items in first row are column headings | |
| * @param {boolean} [ops.strict=false] - Rows must have the same number of columns | |
| */ | |
| window.parseCSV = function(dat, ops){ | |
| var fields = [], | |
| rows = [], | |
| headerRow = false, | |
| options = { | |
| headerRow: false, | |
| strict: false | |
| }; | |
| for(var property in ops) { | |
| if(options.hasOwnProperty(property)) { | |
| options[property] = ops[property]; | |
| } | |
| } | |
| var matches, | |
| match, | |
| pattern = /(?!$)([^\",\r\n]+|\"([^\"]*(\"{2}[^\"]*)*)\"|^)*(,|\r?\n|\r)?/g; | |
| while((matches = pattern.exec(dat))){ | |
| if(matches[2]){ // Quote wrapped match found | |
| if(matches[3]) { // Double quoting match found | |
| match = replaceDoubleQuoting(matches[2]); | |
| } else { | |
| match = matches[2]; | |
| } | |
| } else { // Unwrapped match found | |
| match = matches[1]; | |
| } | |
| fields.push(match); | |
| if(!matches[4] || matches[4] !== ',') { | |
| rows.push(fields); | |
| fields = []; | |
| } | |
| } | |
| if(options.strict) { | |
| if(!rowLengthsEqual(rows)) { | |
| return false; | |
| } | |
| } | |
| if(options.headerRow) { | |
| rows = useFirstRowAsHeaders(rows); | |
| } | |
| return rows; | |
| }; | |
| var replaceDoubleQuoting = function(str) { | |
| var pattern = /\"\"/g; | |
| return str.replace(pattern, '"'); | |
| }; | |
| var rowLengthsEqual = function(arys) { | |
| var equal = arys[0].length; | |
| for(var i = 0, leng = arys.length; i < leng; i++) { | |
| if(arys[i].length !== equal) { | |
| return false; | |
| } | |
| } | |
| return true; | |
| }; | |
| var useFirstRowAsHeaders = function(ary) { | |
| var rows = ary.slice(1), | |
| row, | |
| rowsIndex, | |
| rowsLength, | |
| headers = ary[0], | |
| header, | |
| headersIndex, | |
| headersLength, | |
| object, | |
| newArray = []; | |
| for(rowsIndex = 0, rowsLength = rows.length; rowsIndex < rowsLength; rowsIndex++) { | |
| object = {}; | |
| row = rows[rowsIndex]; | |
| for(headersIndex = 0, headersLength = headers.length; headersIndex < headersLength; headersIndex++) { | |
| header = headers[headersIndex]; | |
| object[header] = row[headersIndex]; | |
| } | |
| newArray.push(object); | |
| } | |
| return newArray; | |
| }; | |
| })(this); |
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