Incorrect syntax for the for loop?

[ANogin]

In trying to use jflex-scala, I am getting a compilation error on the generated .scala file:

[error] .../scala-2.12/src_managed/main/foo.scala:882: '<-' expected but '=' found.
[error]       for (zzCurrentPosL = zzStartRead  ;
[error]                          ^
[error] .../scala-2.12/src_managed/main/foo.scala:882: illegal start of simple expression
[error]       for (zzCurrentPosL = zzStartRead  ;
[error]                                         ^
[error] .../scala-2.12/src_managed/main/foo.scala:883: '<-' expected but ';' found.
[error]            zzCurrentPosL < zzMarkedPosL ;
[error]                                         ^
[error] .../scala-2.12/src_managed/main/foo.scala:884: '<-' expected but ')' found.
[error]            zzCurrentPosL += zzCharCount ) {
[error]                                         ^
[error] .../scala-2.12/src_managed/main/foo.scala:1010: illegal start of simple expression
[error]     }
[error]     ^
[error] 5 errors found

(the last error corresponds to the closing bracket that matches the opening bracket at the end of the while ((ret == null) && !zzAtEOF) { line).

I am very new to both scala and jflex, and trying to incorporate the use of jflex-scala into an existing scala project that has not been using it before. I am using addSbtPlugin("edu.umass.cs.iesl" % "sbt-jflex-scala" % "0.1") to incorporate jflex-scala into the build.

[ANogin]

It would appear that the incorrect code is output by ScalaEmitter.java:727 when either line count or column count is enabled.

[strubell]

Thanks for pointing this out! Would it be possible for you to create a minimal failing example? This would make it much easier to test a fix.

…

On Fri, Mar 1, 2019 at 11:16 PM Aleksey Nogin ***@***.***> wrote: It would appear that the incorrect code is output by ScalaEmitter.java:727 <https://github.com/strubell/jflex-scala/blob/4ad9f781465acfc2cb5d9187980d96ee36b6f155/jflex/src/main/java/jflex/ScalaEmitter.java#L727> when either line count or column count is enabled. — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#1 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/ADHZtyaI_1q4mpvsTzLf9fYfJi-T6HsKks5vSfshgaJpZM4baJ_C> .

[ANogin]

It would appear that any use of %line or %column triggers this bug. E.g.,

%class Foo
%type String
%line
%column

NUMBER = \d+

%%
{NUMBER} { yytext() }

(not sure it's completely valid without %line and %column, but with them, it triggers the exact same thing).