Using "and" or "or" as boolean operators in templates does not work

[matt-in-a-hat]

Pages affected

• Template syntax

Description

Boolean logic
Multiple checks can be done using ||/or, or &&/ and.
or is functionally equivalent to || in template conditions, and and is functionally equivalent to &&.

Unsure if this is an issue with templates, or if the documentation just tries to sell something which doesn't exist, but at least in 5.4 if I try to use "and" or "or" in a template's logic then at best I get "Unexpected problem parsing template", or at worst it quietly fails to render any of the rest of the partial template after that point.

Validations

• Check that there isn't already an issue that reports the same problem

[GuySartorelli]

Moving to https://github.com/silverstripe/silverstripe-template-engine
We'll have to double check, but I don't remember that syntax being intentionally removed.

[lozcalver]

I think this might be a docs issue, looking back at version 4 I can’t find any mention of “and” or “or” outside of code comments. The rules for boolean operators are here, and appear to only be && and ||: https://github.com/silverstripe/silverstripe-framework/blame/4.0.0/src/View/SSTemplateParser.peg#L536

Version 3.7 was the same: https://github.com/silverstripe/silverstripe-framework/blob/3.7.7/view/SSTemplateParser.php.inc#L513

Even the super old regular expression-based parser doesn’t seem to include and and or: https://github.com/silverstripe/silverstripe-framework/blob/33d102d674ca3c0ef35575d5d63350a22368f674/core/SSViewer.php#L544-L550

[GuySartorelli]

Good to know, thanks for looking into it, Loz. Moving the issue back to docs.