[antlr-interest] Token position 0, -1

Ale Strooisma alestrooisma at gmx.net
Fri Jul 6 04:04:47 PDT 2012

No, I had the issue with for example identifiers.
The actual situation where I encountered it is the following: if my 
context-checker encounters a binary expression, it checks if both 
children nodes are of the same type. If they are not, an exception is 
thrown using the coordinates of the token of the first node for 
indicating the position of the error.
I suppose that such a child node can never contain an imaginary token.
However, I will check if I made a dramatic programming error such that I 
accidentally pass the wrong nodes to the function checking this.


On 07/06/2012 12:58 PM, Bart Kiers wrote:
> On Fri, Jul 6, 2012 at 11:47 AM, Ale Strooisma <alestrooisma at gmx.net 
> <mailto:alestrooisma at gmx.net>> wrote:
>     Hello,
>     if I try to get the position of a token in the file with getLine and
>     getCharPositionInLine, many of my tokens give the coördinates 0, -1,
>     which obviously is wrong. Why is this the case, and how can I fix it?
> Hi Ale,
> Are the tokens that return -1 imaginary tokens? These (imaginary) 
> tokens don't have a real position in the input after all.
> Regards,
> Bart.

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