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node-red/nodes/core/logic/10-switch.js

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/**
* Copyright JS Foundation and other contributors, http://js.foundation
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*
* 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.
**/
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module.exports = function(RED) {
"use strict";
var jsonata = require('jsonata');
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var operators = {
'eq': function(a, b) { return a == b; },
'neq': function(a, b) { return a != b; },
'lt': function(a, b) { return a < b; },
'lte': function(a, b) { return a <= b; },
'gt': function(a, b) { return a > b; },
'gte': function(a, b) { return a >= b; },
'btwn': function(a, b, c) { return a >= b && a <= c; },
'cont': function(a, b) { return (a + "").indexOf(b) != -1; },
'regex': function(a, b, c, d) { return (a + "").match(new RegExp(b,d?'i':'')); },
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'true': function(a) { return a === true; },
'false': function(a) { return a === false; },
'null': function(a) { return (typeof a == "undefined" || a === null); },
'nnull': function(a) { return (typeof a != "undefined" && a !== null); },
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'else': function(a) { return a === true; }
};
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function SwitchNode(n) {
RED.nodes.createNode(this, n);
this.rules = n.rules || [];
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this.property = n.property;
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this.propertyType = n.propertyType || "msg";
if (this.propertyType === 'jsonata') {
try {
this.property = jsonata(this.property);
} catch(err) {
this.error(RED._("switch.errors.invalid-expr",{error:err.message}));
return;
}
}
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this.checkall = n.checkall || "true";
this.previousValue = null;
var node = this;
var valid = true;
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for (var i=0; i<this.rules.length; i+=1) {
var rule = this.rules[i];
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if (!rule.vt) {
if (!isNaN(Number(rule.v))) {
rule.vt = 'num';
} else {
rule.vt = 'str';
}
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}
if (rule.vt === 'num') {
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if (!isNaN(Number(rule.v))) {
rule.v = Number(rule.v);
}
} else if (rule.vt === "jsonata") {
try {
rule.v = jsonata(rule.v);
} catch(err) {
this.error(RED._("switch.errors.invalid-expr",{error:err.message}));
valid = false;
}
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}
if (typeof rule.v2 !== 'undefined') {
if (!rule.v2t) {
if (!isNaN(Number(rule.v2))) {
rule.v2t = 'num';
} else {
rule.v2t = 'str';
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}
}
if (rule.v2t === 'num') {
rule.v2 = Number(rule.v2);
} else if (rule.v2t === 'jsonata') {
try {
rule.v2 = jsonata(rule.v2);
} catch(err) {
this.error(RED._("switch.errors.invalid-expr",{error:err.message}));
valid = false;
}
}
}
}
if (!valid) {
return;
}
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this.on('input', function (msg) {
var onward = [];
try {
var prop;
if (node.propertyType === 'jsonata') {
prop = node.property.evaluate({msg:msg});
} else {
prop = RED.util.evaluateNodeProperty(node.property,node.propertyType,node,msg);
}
var elseflag = true;
for (var i=0; i<node.rules.length; i+=1) {
var rule = node.rules[i];
var test = prop;
var v1,v2;
if (rule.vt === 'prev') {
v1 = node.previousValue;
} else if (rule.vt === 'jsonata') {
try {
v1 = rule.v.evaluate({msg:msg});
} catch(err) {
node.error(RED._("switch.errors.invalid-expr",{error:err.message}));
return;
}
} else {
try {
v1 = RED.util.evaluateNodeProperty(rule.v,rule.vt,node,msg);
} catch(err) {
v1 = undefined;
}
}
v2 = rule.v2;
if (rule.v2t === 'prev') {
v2 = node.previousValue;
} else if (rule.v2t === 'jsonata') {
try {
v2 = rule.v2.evaluate({msg:msg});
} catch(err) {
node.error(RED._("switch.errors.invalid-expr",{error:err.message}));
return;
}
} else if (typeof v2 !== 'undefined') {
try {
v2 = RED.util.evaluateNodeProperty(rule.v2,rule.v2t,node,msg);
} catch(err) {
v2 = undefined;
}
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}
if (rule.t == "else") { test = elseflag; elseflag = true; }
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if (operators[rule.t](test,v1,v2,rule.case)) {
onward.push(msg);
elseflag = false;
if (node.checkall == "false") { break; }
} else {
onward.push(null);
}
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}
node.previousValue = prop;
this.send(onward);
} catch(err) {
node.warn(err);
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}
});
}
RED.nodes.registerType("switch", SwitchNode);
}