Pavlo Shevchenko created GROOVY-10936:
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Summary: Patterns conditionally created using pattern operator ~
are cast to String/GString
Key: GROOVY-10936
URL: https://issues.apache.org/jira/browse/GROOVY-10936
Project: Groovy
Issue Type: Bug
Affects Versions: 4.0.9, 4.0.8, 4.0.7
Reporter: Pavlo Shevchenko
*Summary*
If the value of the Pattern object is based on some argument evaluated at
runtime, then such objects will be created as String/GString instead of Pattern.
This used to work in 4.0.6, but started failing in 4.0.7.
*Reproducer*
{code:java}
class Reproducer {
static void main(String... args) {
def random = new Random()
def staticPatternSlashy = ~/some static patter \w+/
def staticPatternGString = ~"some static patter \\w+"
def dynamicPatternSlashy = random.nextInt() % 2 == 0 ? ~/pattern one
\w+/ : ~/pattern two \w+/
def dynamicPatternGString = random.nextInt() % 2 == 0 ? ~"pattern one
\\w+" : ~"pattern two \\w+"
assert staticPatternSlashy instanceof Pattern // succeeds
assert staticPatternGString instanceof Pattern // succeeds
assert dynamicPatternSlashy instanceof Pattern // fails
assert dynamicPatternGString instanceof Pattern // fails
}
} {code}
*Workaround*
Explicitly declaring the variable as Pattern does not work and fails at runtime
as it will attempt to cast the String to Pattern. Creating the pattern using
Pattern.compile() works, but is a nasty refactoring and eliminates the
benefits of the operator.
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