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Support {:else} blocks in @first, @last #143

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Support {:else} blocks in @first, @last #143

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b637594
Support {:else} blocks in @first, @last
claviska Jan 29, 2017
6d1b909
Make format consistent with other helpers
claviska Jan 29, 2017
544aca8
Add tests for first/last with else
claviska Jan 29, 2017
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16 changes: 13 additions & 3 deletions lib/dust-helpers.js
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Original file line number Diff line number Diff line change
Expand Up @@ -188,18 +188,28 @@ var helpers = {
},

"first": function(chunk, context, bodies) {
var body = bodies.block,
skip = bodies['else'];

if (context.stack.index === 0) {
return bodies.block(chunk, context);
chunk = chunk.render(body, context);
} else if (skip) {
chunk = chunk.render(skip, context);
}
return chunk;
},

"last": function(chunk, context, bodies) {
var body = bodies.block,
skip = bodies['else'];

if (context.stack.index === context.stack.of - 1) {
return bodies.block(chunk, context);
chunk = chunk.render(body, context);
} else if (skip) {
chunk = chunk.render(skip, context);
}
return chunk;
},
},

/**
* {@contextDump}
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14 changes: 14 additions & 0 deletions test/jasmine-test/spec/helpersTests.js
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Original file line number Diff line number Diff line change
Expand Up @@ -1595,13 +1595,27 @@
expected: "Hello Alice Bob Charlie ",
message: "first helper should output on the first iteration only"
},
{
name: "first helper with else",
source: "{#guests}{@first}Hello {:else}and {/first}{.} {/guests}",
context: { guests: function() { return ["Alice", "Bob", "Charlie"]; } },
expected: "Hello Alice and Bob and Charlie ",
message: "first helper should support else"
},
{
name: "last helper",
source: "Hello {#guests}{@last}and {/last}{.} {/guests}",
context: { guests: function() { return ["Alice", "Bob", "Charlie"]; } },
expected: "Hello Alice Bob and Charlie ",
message: "last helper should output on the last iteration only"
},
{
name: "last helper with else",
source: "{#guests}{.}{@last}.{:else} and {/last}{/guests}",
context: { guests: function() { return ["Alice", "Bob", "Charlie"]; } },
expected: "Alice and Bob and Charlie.",
message: "last helper should support else"
},
{
name: "first / last / sep combo",
source: "{#guests}{@first}Hello {/first}{@last}and {/last}{.}{@last}!{/last}{@sep}, {/sep}{/guests}",
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