PITS /

01529: new conditional markup condition "empty"

Summary: new conditional markup condition "empty"

Created: 2025-11-11 19:17

Status: Closed, added for 2.5.4

Category: Feature

From: simon

Assigned:

Priority: 3

Version: latest

OS: n/a

Description: I propose

(:if empty STRING:)

true if VARIABLE or STRING is empty or does not exist

to replace the construct

(:if equal "STRING" "":)

simon November 11, 2025, at 07:17 PM

Should a value of "0" be considered empty, like the PHP empty() function? Or these values? Petko November 11, 2025, at 07:33 PM

(:if empty:)                 true
(:if empty :)                true
(:if empty "":)              true
(:if empty {$NoSuchVar}:)    true 
(:if empty "{$NoSuchVar}":)  true
(:if empty 0:)               false, string is '0'
(:if empty "0":)             false, string is '0'
(:if empty false:)           false, string is 'false'
(:if empty "false":)         false, string is 'false'
(:if empty var=value:)       false, string is 'var=value'
(:if empty var=0:)           false, string is 'var=""'
(:if empty var="":)          false, string is 'var=""'

No, I see this as 'string' comparison, I've added what I would expect to be returned above.
true and false can be evaluated using the existing Conditional Markup (:if expr EXPRESSION :)

This PITS does not ask for numeric evaluation (but see something similar at 01469)