Mon 21 Jul 22:43:21 CEST 2025

js/dos/ext/vis/examples/graph3d/playground/csv2array.js

@@ -0,0 +1,120 @@
+/**
+ * Convert data in CSV (comma separated value) format to a javascript array.
+ *
+ * Values are separated by a comma, or by a custom one character delimeter.
+ * Rows are separated by a new-line character.
+ *
+ * Leading and trailing spaces and tabs are ignored.
+ * Values may optionally be enclosed by double quotes.
+ * Values containing a special character (comma's, double-quotes, or new-lines)
+ *   must be enclosed by double-quotes.
+ * Embedded double-quotes must be represented by a pair of consecutive
+ * double-quotes.
+ *
+ * Example usage:
+ *   var csv = '"x", "y", "z"\n12.3, 2.3, 8.7\n4.5, 1.2, -5.6\n';
+ *   var array = csv2array(csv);
+ *
+ * Author: Jos de Jong, 2010
+ *
+ * @param {string} data      The data in CSV format.
+ * @param {string} delimeter [optional] a custom delimeter. Comma ',' by default
+ *                           The Delimeter must be a single character.
+ * @return {Array} array     A two dimensional array containing the data
+ * @throw {String} error     The method throws an error when there is an
+ *                           error in the provided data.
+ */
+function csv2array(data, delimeter) {
+    // Retrieve the delimeter
+    if (delimeter == undefined)
+        delimeter = ',';
+    if (delimeter && delimeter.length > 1)
+        delimeter = ',';
+
+    // initialize variables
+    var newline = '\n';
+    var eof = '';
+    var i = 0;
+    var c = data.charAt(i);
+    var row = 0;
+    var col = 0;
+    var array = new Array();
+
+    while (c != eof) {
+        // skip whitespaces
+        while (c == ' ' || c == '\t' || c == '\r') {
+            c = data.charAt(++i); // read next char
+        }
+
+        // get value
+        var value = "";
+        if (c == '\"') {
+            // value enclosed by double-quotes
+            c = data.charAt(++i);
+
+            do {
+                if (c != '\"') {
+                    // read a regular character and go to the next character
+                    value += c;
+                    c = data.charAt(++i);
+                }
+
+                if (c == '\"') {
+                    // check for escaped double-quote
+                    var cnext = data.charAt(i+1);
+                    if (cnext == '\"') {
+                        // this is an escaped double-quote.
+                        // Add a double-quote to the value, and move two characters ahead.
+                        value += '\"';
+                        i += 2;
+                        c = data.charAt(i);
+                    }
+                }
+            }
+            while (c != eof && c != '\"');
+
+            if (c == eof) {
+                throw "Unexpected end of data, double-quote expected";
+            }
+
+            c = data.charAt(++i);
+        }
+        else {
+            // value without quotes
+            while (c != eof && c != delimeter && c!= newline && c != ' ' && c != '\t' && c != '\r') {
+                value += c;
+                c = data.charAt(++i);
+            }
+        }
+
+        // add the value to the array
+        if (array.length <= row)
+            array.push(new Array());
+        array[row].push(value);
+
+        // skip whitespaces
+        while (c == ' ' || c == '\t' || c == '\r') {
+            c = data.charAt(++i);
+        }
+
+        // go to the next row or column
+        if (c == delimeter) {
+            // to the next column
+            col++;
+        }
+        else if (c == newline) {
+            // to the next row
+            col = 0;
+            row++;
+        }
+        else if (c != eof) {
+            // unexpected character
+            throw "Delimiter expected after character " + i;
+        }
+
+        // go to the next character
+        c = data.charAt(++i);
+    }
+
+    return array;
+}