Support "else X" for block helpers

[pmccloghrylaing]

In the JS library you can chain else with any block helper - not just if and unless.

I'm currently using else with a custom helper that does Regex matching:

{{#match cultureCode "^de\b"}}
...
{{else match cultureCode "^it\b"}}
...

This example can be worked around easily by changing the helper and switching to sub-expressions ({{#if (match ...)}}), but this is something that works in the JS library.

It would be nice if it allowed if, each and unless to be defined as regular helpers.

I created a solution for this (before I realised else if was supported) that expanded {{#A}}{{else B}}{{/A}} into {{#A}}{{else}}{{#B}}{{/B}}{{/A}}. Looking at the existing code it seems like combining the ConditionalBlockAccumulatorContext and BlockHelperAccumulatorContext would be a better approach.

[sferencik]

The readme seems to showcase this as doable. What am I missing? See here:

{{StringEqualityBlockHelper @value 'dog'}}is a dog{{else}}is not a dog{{/StringEqualityBlockHelper}}

[oformaniuk]

@sferencik Readme misses # before block helper call. Valid example:

{{#each this}}
 The animal, {{@key}}, {{#StringEqualityBlockHelper @value 'dog'}}is a dog{{else}}is not a dog{{/StringEqualityBlockHelper}}.\r\n
{{/each}}

[sferencik]

So you're saying it's an issue with the documentation (readme) but the feature exists?

[oformaniuk]

So you're saying it's an issue with the documentation (readme) but the feature exists?

It depends what feature you’re referring to. If you’re talking about behavior from Readme and your example - yes, it’s implemented. It you’re talking about the subject of the Github issue - no, it’s not implemented yet.

[sferencik]

Oh, I get it. This is about a kind-of "else if" behaviour: {{else CONDITION}}.

[sferencik]

#358 fixes the readme.