Question regarding JRubyParser.parse and org.jrubyparser.lexer.SyntaxException

Ruby JRuby
1

How would I retrieve the line number of the syntax error in the rescue
clause ?

Regards
Roger

Example

require “jruby-parser”

begin

root = JRubyParser.parse("begin
b = foo(1)
x = 'l
begin
x
resc
end
x = 12
end ", opts = {:version => JRubyParser::Compat::RUBY1_9, :filename
=> ‘name.rb’})

rescue NativeException => e

puts e

end

2

You can catch the SyntaxException itself.

-Tom

require “jruby-parser”

begin
root = JRubyParser.parse("begin
b = foo(1)
x = 'l
begin
x
resc
end
x = 12
end ", opts = {:version =>
JRubyParser::Compat::RUBY1_9, :filename => ‘name.rb’})

rescue org.jrubyparser.lexer.SyntaxException => e

    puts e

end

On Wed, Jul 25, 2012 at 1:18 PM, Roger G. [email protected] wrote:

rescue NativeException => e
http://xircles.codehaus.org/manage_email

–
blog: http://blog.enebo.com twitter: tom_enebo
mail: [email protected]

3

Sorry. I missed the important bit:

rescue org.jrubyparser.lexer.SyntaxException => e

    puts e.position.start_line, e.position.file

end

-Tom

On Thu, Jul 26, 2012 at 12:06 PM, Thomas E Enebo [email protected]
wrote:

            begin

            end

blog: http://blog.enebo.com twitter: tom_enebo
mail: [email protected]

–
blog: http://blog.enebo.com twitter: tom_enebo
mail: [email protected]

4

Thanks for the reply,

but now I get:

NoMethodError: undefined method `position’ for
#NativeException:0x93f95d6
(root) at jtest.rb:5

Regards
Roger

Am 26.07.2012 um 19:08 schrieb Thomas E Enebo [email protected]:

5

Roger G. wrote in post #1070301:

Thanks for the reply,

but now I get:

NoMethodError: undefined method `position’ for
#NativeException:0x93f95d6
(root) at jtest.rb:5

Regards
Roger

Am 26.07.2012 um 19:08 schrieb Thomas E Enebo [email protected]:

From my own experiences, I’ve found that in your rescue block, e is a
NativeException and its cause is a Ruby class which proxies for the
underlying Java org.jrubyparser.lexer.SyntaxException class. So you
need:

rescue org.jrubyparser.lexer.SyntaxException => e
puts e.cause.position.start_line, e.cause.position.file
end

Far from obvious behaviour. I had to go digging around in the JRuby
source code to figure this out.