mirror of
https://github.com/node-red/node-red.git
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158 lines
8.5 KiB
JavaScript
158 lines
8.5 KiB
JavaScript
/**
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* Copyright 2014 IBM Corp.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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**/
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module.exports = function(RED) {
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"use strict";
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function CSVNode(n) {
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RED.nodes.createNode(this,n);
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this.template = n.temp.split(",");
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this.sep = (n.sep || ',').replace("\\t","\t").replace("\\n","\n").replace("\\r","\r");
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this.quo = '"';
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this.ret = (n.ret || "\n").replace("\\n","\n").replace("\\r","\r");
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this.winflag = (this.ret === "\r\n");
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this.lineend = "\n";
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this.multi = n.multi || "one";
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this.hdrin = n.hdrin || false;
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this.hdrout = n.hdrout || false;
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this.goodtmpl = true;
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var node = this;
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// pass in an array of column names to be trimed, de-quoted and retrimed
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var clean = function(col) {
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for (var t = 0; t < col.length; t++) {
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col[t] = col[t].trim(); // remove leading and trailing whitespace
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if (col[t].charAt(0) === '"' && col[t].charAt(col[t].length -1) === '"') {
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// remove leading and trailing quotes (if they exist) - and remove whitepace again.
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col[t] = col[t].substr(1,col[t].length -2).trim();
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}
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}
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if ((col.length === 1) && (col[0] === "")) { node.goodtmpl = false; }
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else { node.goodtmpl = true; }
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return col;
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}
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node.template = clean(node.template);
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this.on("input", function(msg) {
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if (msg.hasOwnProperty("payload")) {
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if (typeof msg.payload == "object") { // convert object to CSV string
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try {
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var ou = "";
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if (node.hdrout) {
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ou += node.template.join(node.sep) + node.ret;
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}
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if (!Array.isArray(msg.payload)) { msg.payload = [ msg.payload ]; }
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for (var s = 0; s < msg.payload.length; s++) {
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for (var t=0; t < node.template.length; t++) {
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// aaargh - resorting to eval here - but fairly contained front and back.
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var p = RED.util.ensureString(eval("msg.payload[s]."+node.template[t]));
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if (p === "undefined") { p = ""; }
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if (p.indexOf(node.sep) != -1) { // add quotes if any "commas"
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ou += node.quo + p + node.quo + node.sep;
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}
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else if (p.indexOf(node.quo) != -1) { // add double quotes if any quotes
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p = p.replace(/"/g, '""');
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ou += node.quo + p + node.quo + node.sep;
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}
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else { ou += p + node.sep; } // otherwise just add
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}
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ou = ou.slice(0,-1) + node.ret; // remove final "comma" and add "newline"
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}
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node.send({payload:ou});
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}
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catch(e) { node.log(e); }
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}
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else if (typeof msg.payload == "string") { // convert CSV string to object
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try {
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var f = true; // flag to indicate if inside or outside a pair of quotes true = outside.
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var j = 0; // pointer into array of template items
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var k = [""]; // array of data for each of the template items
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var o = {}; // output object to build up
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var a = []; // output array is needed for multiline option
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var first = true; // is this the first line
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var tmp = "";
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// For now we are just going to assume that any \r or \n means an end of line...
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// got to be a weird csv that has singleton \r \n in it for another reason...
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// Now process the whole file/line
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for (var i = 0; i < msg.payload.length; i++) {
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if ((node.hdrin === true) && first) { // if the template is in the first line
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if ((msg.payload[i] === "\n")||(msg.payload[i] === "\r")) { // look for first line break
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node.template = clean(tmp.split(node.sep));
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first = false;
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}
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else { tmp += msg.payload[i]; }
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}
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else {
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if (msg.payload[i] === node.quo) { // if it's a quote toggle inside or outside
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f = !f;
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if (msg.payload[i-1] === node.quo) { k[j] += '\"'; } // if it's a quotequote then it's actually a quote
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}
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else if ((msg.payload[i] === node.sep) && f) { // if we are outside of quote (ie valid separator
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if (!node.goodtmpl) { node.template[j] = "col"+(j+1); }
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if ( node.template[j] && (node.template[j] !== "") && (k[j] !== "" ) ) {
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if (!isNaN(Number(k[j]))) { k[j] = Number(k[j]); }
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o[node.template[j]] = k[j];
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}
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j += 1;
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k[j] = "";
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}
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else if (f && ((msg.payload[i] === "\n") || (msg.payload[i] === "\r"))) { // handle multiple lines
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//console.log(j,k,o,k[j]);
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if ( node.template[j] && (node.template[j] !== "") && (k[j] !== "") ) {
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if (!isNaN(Number(k[j]))) { k[j] = Number(k[j]); }
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else { k[j].replace(/\r$/,''); }
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o[node.template[j]] = k[j];
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}
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if (JSON.stringify(o) !== "{}") { // don't send empty objects
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if (node.multi === "one") { node.send({payload:o}); } // either send
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else { a.push(o); } // or add to the array
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}
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j = 0;
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k = [""];
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o = {};
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}
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else { // just add to the part of the message
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k[j] += msg.payload[i];
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}
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}
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}
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// Finished so finalize and send anything left
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//console.log(j,k,o,k[j]);
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if (!node.goodtmpl) { node.template[j] = "col"+(j+1); }
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if ( node.template[j] && (node.template[j] !== "") && (k[j] !== "") ) {
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if (!isNaN(Number(k[j]))) { k[j] = Number(k[j]); }
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else { k[j].replace(/\r$/,''); }
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o[node.template[j]] = k[j];
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}
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msg.payload = o;
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if (JSON.stringify(o) !== "{}") { // don't send empty objects
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if (node.multi === "one") { node.send({payload:o}); } // either send
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else { a.push(o); } // or add to the aray
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}
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if (node.multi !== "one") { node.send({payload:a}); } // finally send the array
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}
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catch(e) { node.log(e); }
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}
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else { node.log("This node only handles csv strings or js objects."); }
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}
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});
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}
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RED.nodes.registerType("csv",CSVNode);
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}
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