121 lines
3.7 KiB
JavaScript
121 lines
3.7 KiB
JavaScript
/**
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* Convert data in CSV (comma separated value) format to a javascript array.
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*
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* Values are separated by a comma, or by a custom one character delimeter.
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* Rows are separated by a new-line character.
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*
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* Leading and trailing spaces and tabs are ignored.
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* Values may optionally be enclosed by double quotes.
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* Values containing a special character (comma's, double-quotes, or new-lines)
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* must be enclosed by double-quotes.
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* Embedded double-quotes must be represented by a pair of consecutive
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* double-quotes.
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*
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* Example usage:
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* var csv = '"x", "y", "z"\n12.3, 2.3, 8.7\n4.5, 1.2, -5.6\n';
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* var array = csv2array(csv);
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*
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* Author: Jos de Jong, 2010
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*
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* @param {string} data The data in CSV format.
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* @param {string} delimeter [optional] a custom delimeter. Comma ',' by default
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* The Delimeter must be a single character.
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* @return {Array} array A two dimensional array containing the data
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* @throw {String} error The method throws an error when there is an
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* error in the provided data.
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*/
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function csv2array(data, delimeter) {
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// Retrieve the delimeter
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if (delimeter == undefined)
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delimeter = ',';
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if (delimeter && delimeter.length > 1)
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delimeter = ',';
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// initialize variables
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var newline = '\n';
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var eof = '';
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var i = 0;
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var c = data.charAt(i);
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var row = 0;
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var col = 0;
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var array = new Array();
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while (c != eof) {
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// skip whitespaces
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while (c == ' ' || c == '\t' || c == '\r') {
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c = data.charAt(++i); // read next char
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}
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// get value
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var value = "";
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if (c == '\"') {
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// value enclosed by double-quotes
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c = data.charAt(++i);
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do {
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if (c != '\"') {
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// read a regular character and go to the next character
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value += c;
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c = data.charAt(++i);
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}
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if (c == '\"') {
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// check for escaped double-quote
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var cnext = data.charAt(i+1);
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if (cnext == '\"') {
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// this is an escaped double-quote.
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// Add a double-quote to the value, and move two characters ahead.
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value += '\"';
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i += 2;
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c = data.charAt(i);
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}
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}
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}
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while (c != eof && c != '\"');
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if (c == eof) {
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throw "Unexpected end of data, double-quote expected";
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}
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c = data.charAt(++i);
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}
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else {
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// value without quotes
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while (c != eof && c != delimeter && c!= newline && c != ' ' && c != '\t' && c != '\r') {
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value += c;
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c = data.charAt(++i);
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}
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}
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// add the value to the array
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if (array.length <= row)
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array.push(new Array());
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array[row].push(value);
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// skip whitespaces
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while (c == ' ' || c == '\t' || c == '\r') {
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c = data.charAt(++i);
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}
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// go to the next row or column
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if (c == delimeter) {
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// to the next column
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col++;
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}
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else if (c == newline) {
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// to the next row
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col = 0;
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row++;
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}
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else if (c != eof) {
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// unexpected character
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throw "Delimiter expected after character " + i;
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}
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// go to the next character
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c = data.charAt(++i);
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}
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return array;
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}
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