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handle HALT as a value correctly

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This commit is contained in:
Leo Horie 2016-08-11 00:28:28 -04:00
parent 9d38c12630
commit 701e2d8e31
2 changed files with 17 additions and 3 deletions
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6
util/stream.js
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@ -3,12 +3,12 @@
var guid = 0, noop = function() {}, HALT = {}
function createStream() {
function stream() {
if (arguments.length > 0) updateStream(stream, arguments[0], undefined)
if (arguments.length > 0 && arguments[0] !== HALT) updateStream(stream, arguments[0], undefined)
return stream._state.value
}
initStream(stream, arguments)
if (arguments.length > 0) updateStream(stream, arguments[0], undefined)
if (arguments.length > 0 && arguments[0] !== HALT) updateStream(stream, arguments[0], undefined)
return stream
}
@ -23,7 +23,7 @@ function initStream(stream, args) {
error: {get: function() {
if (!stream._state.errorStream) {
var errorStream = function() {
if (arguments.length > 0) updateStream(stream, undefined, arguments[0])
if (arguments.length > 0 && arguments[0] !== HALT) updateStream(stream, undefined, arguments[0])
return stream._state.error
}
initStream(errorStream, [])

14
util/tests/test-stream.js
View file

@ -458,6 +458,20 @@ o.spec("stream", function() {
o(mapped()).equals("undefined")
})
o("does not run when initialized w/ HALT", function() {
var stream = Stream.stream(Stream.HALT)
var mapped = stream.run(function(value) {return 123})
o(mapped()).equals(undefined)
})
o("does not run when set to HALT", function() {
var stream = Stream.stream()
var mapped = stream.run(function(value) {return 123})
stream(Stream.HALT)
o(mapped()).equals(undefined)
})
o("works with default undefined value", function() {
var stream = Stream.stream(undefined)
var mapped = stream.run(function(value) {return String(value)})