Qute IfSectionHelper - consider truthy values during evaluation

[mkouba]

Currently, the param must be evaluated to true. We could consider a truthy value instead. I.e. something like https://developer.mozilla.org/en-US/docs/Glossary/Truthy.

Also consider adding the unless tag that would render the content if the param evaluates to a falsy value. We can use logical complement, e.g. {#if !collection}.

Examples:

{#if string}
  Renders if non-empty string
{/if}
{#if collection}
    Renders if non-empty collection
{/if}
{#if number}
  Renders if number not 0
{/if}

[Ladicek]

Instead of JavaScript rules, I'd suggest using Groovy rules: http://groovy-lang.org/semantics.html#Groovy-Truth (which are actually pretty close to what you describe).

[mkouba]

@Ladicek +1

I was thinking of using this https://github.com/trimou/trimou/blob/master/core/src/main/java/org/trimou/util/Checker.java#L84-L101 which is essentially the same (except for the matchers).

[gsmet]

If we want to do that, let's do it dirty and use the PHP or Javascript rules :).

That will be far more interesting and a constant stream of easy bugs to fix :).

[mkouba]

We're not talking about a proper type coercion ;-). Those rules are IMO fine (if documented).