Lyuben Atanasov created GROOVY-10008:
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Summary: Parser: Consider adding expressions from next line to
statement on current line
Key: GROOVY-10008
URL: https://issues.apache.org/jira/browse/GROOVY-10008
Project: Groovy
Issue Type: Wish
Components: parser
Reporter: Lyuben Atanasov
As many people are coming from Java, there are some caveats regarding the
optional semicolon at the end of a statement that are probably not well
explained in the documentation. For example, the following code:
{code:java}
int sum = 2
+ 2; {code}
is compiled successfully, but the outcome is very unexpected - the variable sum
will hold the value "2", and the second line effectively does nothing.
A more annoying example is when porting code from Java that has a very long
string split into parts, concatenated on different lines like so:
{code:java}
String concatenated = "This is part 1"
+ "This is part 2"
+ "This is part 3";{code}
This is a very common occurrence, and in Groovy it results in a weird syntax
error.
I am well aware that I can add "\" at the end of the line to continue the
statement, but this does not really solve the core issue. According to
GROOVY-6476, this is not considered a problem, but in other scripting
languages, where semicolons are optional, like JavaScript, both of these
examples work as expected - {{sum}} is equal to "4", and the string is
concatenated.
It would be nice if the parser considers adding the expressions that begin on
the next line to the statement that has been started on the previous line for
such common cases. For example, if the line does not end with a semicolon,
then look at the first token on the next line and see if it is an operator. If
it is, then continue the statement, instead of terminating it implicitly at the
end of the line.
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