Printing Line Source Code LIne Numbers

[Suzanna Schmeelk]

I'm using the excellent Recoder front end and was wondering if someone could
point me to the class for printing source code line numbers? (I've only been
able to find a line number utility within the PrettyPrint class which seems to
be the output line number, not the source code line number). Thanks in
advance.

[Tobias Gutzmann]

Hej,

each element in the abstract syntax tree has getStartPosition() and
getEndPosition() defined. Both return an instance of
recoder.java.SourceElement.Position. This class defines getLine() and
getColumn().

Some notes:

-- in order to reduce memory footprint, both start and end position share a
"long" field together with the relative position (relative offset
to the closest other token). In order to achieve this, the maximum column
position is limited to 255 - a token at column 300 will report 255. Line
numbers are limited to 65534 - yes, "34" at the end for internal
reasons ;-)

-- consider the following construct:

1: @Deprecated 2: public class A { 3: ... 4: }

Here, the if you have a variable classDecl referencing class "A",
you will have a start position line 2 / column 8 (the 'class' in the code). To
get the "whole" class, do the following:
classDecl.getFirstElement().getStartPosition(). The call to getFirstElement()
will return "@Deprecated" in this case.

I hope this answers your question!

Best regards,
Tobias