mirror of https://github.com/node-red/node-red.git
88 lines
2.9 KiB
JavaScript
88 lines
2.9 KiB
JavaScript
/**
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* Copyright JS Foundation and other contributors, http://js.foundation
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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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var mustache = require("mustache");
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/**
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* Custom Mustache Context capable to resolve message property and node
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* flow and global context
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*/
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function NodeContext(msg, nodeContext) {
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this.msgContext = new mustache.Context(msg);
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this.nodeContext = nodeContext;
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}
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NodeContext.prototype = new mustache.Context();
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NodeContext.prototype.lookup = function (name) {
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// try message first:
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var value = this.msgContext.lookup(name);
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if (value !== undefined) {
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return value;
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}
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// try node context:
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var dot = name.indexOf(".");
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if (dot > 0) {
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var contextName = name.substr(0, dot);
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var variableName = name.substr(dot + 1);
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if (contextName === "flow" && this.nodeContext.flow) {
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return this.nodeContext.flow.get(variableName);
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}
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else if (contextName === "global" && this.nodeContext.global) {
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return this.nodeContext.global.get(variableName);
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}
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}
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}
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function TemplateNode(n) {
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RED.nodes.createNode(this,n);
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this.name = n.name;
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this.field = n.field || "payload";
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this.template = n.template;
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this.syntax = n.syntax || "mustache";
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this.fieldType = n.fieldType || "msg";
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var node = this;
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node.on("input", function(msg) {
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try {
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var value;
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if (node.syntax === "mustache") {
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value = mustache.render(node.template, new NodeContext(msg, node.context()));
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} else {
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value = node.template;
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}
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if (node.fieldType === 'msg') {
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RED.util.setMessageProperty(msg,node.field,value);
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} else if (node.fieldType === 'flow') {
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node.context().flow.set(node.field,value);
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} else if (node.fieldType === 'global') {
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node.context().global.set(node.field,value);
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}
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node.send(msg);
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} catch(err) {
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node.error(err.message);
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}
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});
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}
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RED.nodes.registerType("template",TemplateNode);
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RED.library.register("templates");
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}
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