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Diffstat (limited to 'dgbuilder/core_nodes/parsers/70-CSV.js')
| -rw-r--r-- | dgbuilder/core_nodes/parsers/70-CSV.js | 157 |
1 files changed, 157 insertions, 0 deletions
diff --git a/dgbuilder/core_nodes/parsers/70-CSV.js b/dgbuilder/core_nodes/parsers/70-CSV.js new file mode 100644 index 00000000..56aa7c72 --- /dev/null +++ b/dgbuilder/core_nodes/parsers/70-CSV.js @@ -0,0 +1,157 @@ +/** + * Copyright 2014 IBM Corp. + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + **/ + +module.exports = function(RED) { + "use strict"; + function CSVNode(n) { + RED.nodes.createNode(this,n); + this.template = n.temp.split(","); + this.sep = (n.sep || ',').replace("\\t","\t").replace("\\n","\n").replace("\\r","\r"); + this.quo = '"'; + this.ret = (n.ret || "\n").replace("\\n","\n").replace("\\r","\r"); + this.winflag = (this.ret === "\r\n"); + this.lineend = "\n"; + this.multi = n.multi || "one"; + this.hdrin = n.hdrin || false; + this.hdrout = n.hdrout || false; + this.goodtmpl = true; + var node = this; + + // pass in an array of column names to be trimed, de-quoted and retrimed + var clean = function(col) { + for (var t = 0; t < col.length; t++) { + col[t] = col[t].trim(); // remove leading and trailing whitespace + if (col[t].charAt(0) === '"' && col[t].charAt(col[t].length -1) === '"') { + // remove leading and trailing quotes (if they exist) - and remove whitepace again. + col[t] = col[t].substr(1,col[t].length -2).trim(); + } + } + if ((col.length === 1) && (col[0] === "")) { node.goodtmpl = false; } + else { node.goodtmpl = true; } + return col; + } + node.template = clean(node.template); + + this.on("input", function(msg) { + if (msg.hasOwnProperty("payload")) { + if (typeof msg.payload == "object") { // convert object to CSV string + try { + var ou = ""; + if (node.hdrout) { + ou += node.template.join(node.sep) + node.ret; + } + if (!Array.isArray(msg.payload)) { msg.payload = [ msg.payload ]; } + for (var s = 0; s < msg.payload.length; s++) { + for (var t=0; t < node.template.length; t++) { + + // aaargh - resorting to eval here - but fairly contained front and back. + var p = RED.util.ensureString(eval("msg.payload[s]."+node.template[t])); + + if (p === "undefined") { p = ""; } + if (p.indexOf(node.sep) != -1) { // add quotes if any "commas" + ou += node.quo + p + node.quo + node.sep; + } + else if (p.indexOf(node.quo) != -1) { // add double quotes if any quotes + p = p.replace(/"/g, '""'); + ou += node.quo + p + node.quo + node.sep; + } + else { ou += p + node.sep; } // otherwise just add + } + ou = ou.slice(0,-1) + node.ret; // remove final "comma" and add "newline" + } + node.send({payload:ou}); + } + catch(e) { node.log(e); } + } + else if (typeof msg.payload == "string") { // convert CSV string to object + try { + var f = true; // flag to indicate if inside or outside a pair of quotes true = outside. + var j = 0; // pointer into array of template items + var k = [""]; // array of data for each of the template items + var o = {}; // output object to build up + var a = []; // output array is needed for multiline option + var first = true; // is this the first line + var tmp = ""; + + // For now we are just going to assume that any \r or \n means an end of line... + // got to be a weird csv that has singleton \r \n in it for another reason... + + // Now process the whole file/line + for (var i = 0; i < msg.payload.length; i++) { + if ((node.hdrin === true) && first) { // if the template is in the first line + if ((msg.payload[i] === "\n")||(msg.payload[i] === "\r")) { // look for first line break + node.template = clean(tmp.split(node.sep)); + first = false; + } + else { tmp += msg.payload[i]; } + } + else { + if (msg.payload[i] === node.quo) { // if it's a quote toggle inside or outside + f = !f; + if (msg.payload[i-1] === node.quo) { k[j] += '\"'; } // if it's a quotequote then it's actually a quote + } + else if ((msg.payload[i] === node.sep) && f) { // if we are outside of quote (ie valid separator + if (!node.goodtmpl) { node.template[j] = "col"+(j+1); } + if ( node.template[j] && (node.template[j] !== "") && (k[j] !== "" ) ) { + if (!isNaN(Number(k[j]))) { k[j] = Number(k[j]); } + o[node.template[j]] = k[j]; + } + j += 1; + k[j] = ""; + } + else if (f && ((msg.payload[i] === "\n") || (msg.payload[i] === "\r"))) { // handle multiple lines + //console.log(j,k,o,k[j]); + if ( node.template[j] && (node.template[j] !== "") && (k[j] !== "") ) { + if (!isNaN(Number(k[j]))) { k[j] = Number(k[j]); } + else { k[j].replace(/\r$/,''); } + o[node.template[j]] = k[j]; + } + if (JSON.stringify(o) !== "{}") { // don't send empty objects + if (node.multi === "one") { node.send({payload:o}); } // either send + else { a.push(o); } // or add to the array + } + j = 0; + k = [""]; + o = {}; + } + else { // just add to the part of the message + k[j] += msg.payload[i]; + } + } + } + // Finished so finalize and send anything left + //console.log(j,k,o,k[j]); + if (!node.goodtmpl) { node.template[j] = "col"+(j+1); } + if ( node.template[j] && (node.template[j] !== "") && (k[j] !== "") ) { + if (!isNaN(Number(k[j]))) { k[j] = Number(k[j]); } + else { k[j].replace(/\r$/,''); } + o[node.template[j]] = k[j]; + } + msg.payload = o; + if (JSON.stringify(o) !== "{}") { // don't send empty objects + if (node.multi === "one") { node.send({payload:o}); } // either send + else { a.push(o); } // or add to the aray + } + if (node.multi !== "one") { node.send({payload:a}); } // finally send the array + } + catch(e) { node.log(e); } + } + else { node.log("This node only handles csv strings or js objects."); } + } + }); + } + RED.nodes.registerType("csv",CSVNode); +} |