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Add isEmpty check to switch node

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This commit is contained in:
Nick O'Leary
2018-07-11 16:14:09 +01:00
parent 28402b0894
commit e94708606d
4 changed files with 118 additions and 16 deletions
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8
nodes/core/logic/10-switch.html
View File

@@ -60,6 +60,12 @@
<li>An <b>Otherwise</b> rule can be used to match if none of the preceeding
rules have matched.</li>
</ol>
<h4>Notes</h4>
<p>The <code>is true/false</code> and <code>is null</code> rules perform strict
comparisons against those types. They do not convert between types.</p>
<p>The <code>is empty</code> rule passes for Strings, Arrays and Buffers that have
a length of 0, or Objects that have no properties. It does not pass for <code>null</code>
or <code>undefined</code> values.</p>
<h4>Handling message sequences</h4>
<p>By default, the node does not modify the <code>msg.parts</code> property of messages
that are part of a sequence.</p>
@@ -86,6 +92,8 @@
{v:"null",t:"switch.rules.null",kind:'V'},
{v:"nnull",t:"switch.rules.nnull",kind:'V'},
{v:"istype",t:"switch.rules.istype",kind:'V'},
{v:"empty",t:"switch.rules.empty",kind:'V'},
{v:"nempty",t:"switch.rules.nempty",kind:'V'},
{v:"head",t:"switch.rules.head",kind:'S'},
{v:"index",t:"switch.rules.index",kind:'S'},
{v:"tail",t:"switch.rules.tail",kind:'S'},

17
nodes/core/logic/10-switch.js
View File

@@ -31,6 +31,23 @@ module.exports = function(RED) {
'false': function(a) { return a === false; },
'null': function(a) { return (typeof a == "undefined" || a === null); },
'nnull': function(a) { return (typeof a != "undefined" && a !== null); },
'empty': function(a) {
if (typeof a === 'string' || Array.isArray(a) || Buffer.isBuffer(a)) {
return a.length === 0;
} else if (typeof a === 'object') {
return Object.keys(a).length === 0;
}
return false;
},
'nempty': function(a) {
if (typeof a === 'string' || Array.isArray(a) || Buffer.isBuffer(a)) {
return a.length !== 0;
} else if (typeof a === 'object') {
return Object.keys(a).length !== 0;
}
return false;
},
'istype': function(a, b) {
if (b === "array") { return Array.isArray(a); }
else if (b === "buffer") { return Buffer.isBuffer(a); }