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Add multi-rule support to Change node

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This commit is contained in:
Nick O'Leary
2015-03-18 16:20:21 +00:00
parent 5610a3184e
commit f0139f9808
4 changed files with 343 additions and 163 deletions
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146
nodes/core/logic/15-change.js
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@@ -1,5 +1,5 @@
/**
* Copyright 2013 IBM Corp.
* Copyright 2013, 2015 IBM Corp.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
@@ -19,71 +19,99 @@ module.exports = function(RED) {
function ChangeNode(n) {
RED.nodes.createNode(this, n);
this.action = n.action;
this.property = n.property || "";
this.from = n.from || "";
this.to = n.to || "";
this.reg = (n.reg === null || n.reg);
if (this.reg === false) {
this.from = this.from.replace(/[-[\]{}()*+?.,\\^$|#\s]/g, "\\$&");
this.rules = n.rules;
if (!this.rules) {
var rule = {
t:(n.action=="replace"?"set":n.action),
p:n.property||""
}
if (rule.t === "set") {
rule.to = n.to||"";
} else if (rule.t === "change") {
rule.from = n.from||"";
rule.to = n.to||"";
rule.re = (n.reg===null||n.reg);
}
this.rules = [rule];
}
this.actions = [];
var valid = true;
if (this.action === "change") {
try {
this.re = new RegExp(this.from, "g");
} catch (e) {
valid = false;
this.error("Invalid 'from' property: "+e.message);
for (var i=0;i<this.rules.length;i++) {
var rule = this.rules[i];
if (rule.t === "change") {
if (rule.re === false) {
rule.from = rule.from.replace(/[-[\]{}()*+?.,\\^$|#\s]/g, "\\$&");
}
try {
rule.from = new RegExp(rule.from, "g");
} catch (e) {
valid = false;
this.error("Invalid 'from' property: "+e.message);
}
}
}
function applyRule(msg,rule) {
var propertyParts;
var depth = 0;
propertyParts = rule.p.split(".");
try {
propertyParts.reduce(function(obj, i) {
var to = rule.to;
// Set msg from property to another msg property
if (rule.t === "set" && rule.to.indexOf("msg.") === 0) {
var parts = to.substring(4);
var msgPropParts = parts.split(".");
try {
msgPropParts.reduce(function(ob, j) {
to = (typeof ob[j] !== "undefined" ? ob[j] : undefined);
return to;
}, msg);
} catch (err) {}
}
if (++depth === propertyParts.length) {
if (rule.t === "change") {
if (typeof obj[i] === "string") {
obj[i] = obj[i].replace(rule.from, rule.to);
}
} else if (rule.t === "set") {
if (typeof to === "undefined") {
delete(obj[i]);
} else {
obj[i] = to;
}
} else if (rule.t === "delete") {
delete(obj[i]);
}
} else {
// to property doesn't exist, don't create empty object
if (typeof to === "undefined") {
return;
// setting a non-existent multilevel object, create empty parent
} else if (!obj[i]) {
obj[i] = {};
}
return obj[i];
}
}, msg);
} catch (err) {}
return msg;
}
if (valid) {
var node = this;
this.on('input', function(msg) {
var propertyParts;
var depth = 0;
propertyParts = node.property.split(".");
try {
propertyParts.reduce(function(obj, i) {
var to = node.to;
// Set msg from property to another msg property
if (node.action === "replace" && node.to.indexOf("msg.") === 0) {
var parts = to.substring(4);
var msgPropParts = parts.split(".");
try {
msgPropParts.reduce(function(ob, j) {
to = (typeof ob[j] !== "undefined" ? ob[j] : undefined);
return to;
}, msg);
} catch (err) {}
}
if (++depth === propertyParts.length) {
if (node.action === "change") {
if (typeof obj[i] === "string") {
obj[i] = obj[i].replace(node.re, node.to);
}
} else if (node.action === "replace") {
if (typeof to === "undefined") {
delete(obj[i]);
} else {
obj[i] = to;
}
} else if (node.action === "delete") {
delete(obj[i]);
}
} else {
// to property doesn't exist, don't create empty object
if (typeof to === "undefined") {
return;
// setting a non-existent multilevel object, create empty parent
} else if (!obj[i]) {
obj[i] = {};
}
return obj[i];
}
}, msg);
} catch (err) {}
for (var i=0;i<this.rules.length;i++) {
msg = applyRule(msg,this.rules[i]);
}
node.send(msg);
});
}