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feat: add function is blank() to check if a string is blank #927

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Merged
merged 4 commits into from
Sep 20, 2024
Merged

feat: add function is blank() to check if a string is blank #927

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1513925
feat: add function `is blank()` to check if a string is blank
skayliu Sep 19, 2024
a299adb
Merge branch 'camunda:main' into skayliu-is-blank
skayliu Sep 20, 2024
33ee564
feat: add function `is blank()` to check if a string is blank or not
skayliu Sep 20, 2024
356ca38
refactor: Group test cases together
saig0 Sep 20, 2024
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10 changes: 9 additions & 1 deletion src/main/scala/org/camunda/feel/impl/builtin/StringBuiltinFunctions.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -45,7 +45,8 @@ object StringBuiltinFunctions {
"extract" -> List(extractFunction),
"trim" -> List(trimFunction),
"uuid" -> List(uuidFunction),
"to base64" -> List(toBase64Function)
"to base64" -> List(toBase64Function),
"is blank" -> List(isBlankFunction)
)

private def substringFunction = builtinFunction(
Expand Down Expand Up @@ -287,4 +288,11 @@ object StringBuiltinFunctions {
}
)

private def isBlankFunction = builtinFunction(
params = List("string"),
invoke = {case List(ValString(string)) =>
ValBoolean(string.isBlank)
}
)

}
28 changes: 28 additions & 0 deletions src/test/scala/org/camunda/feel/impl/builtin/BuiltinStringFunctionsTest.scala
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Expand Up @@ -195,4 +195,32 @@ class BuiltinStringFunctionsTest

evaluateExpression(""" to base64(value: "Camunda") """) should returnResult("Q2FtdW5kYQ==")
}

"A is blank() function" should "return true if the string contains only whitespace" in {
evaluateExpression(
expression = """ is blank("") """
) should returnResult(true)

evaluateExpression(
expression = """ is blank(" ") """
) should returnResult(true)

evaluateExpression(
expression = """ is blank("\t\n\r\f") """
) should returnResult(true)

evaluateExpression(
expression = """ is blank(string: "") """
) should returnResult(true)
}

"A is blank() function" should "return false if the string contains only non-whitespace characters" in {
evaluateExpression(
expression = """ is blank("hello world") """
) should returnResult(false)

evaluateExpression(
expression = """ is blank(" hello world ") """
) should returnResult(false)
}
}