[antlr-interest] Dynamically changing inputstream or AST node structure during parsing ?

[Xavier Benveniste]

Hi,

I would like to know if it is possible to change the input stream (or AST node structure) during parsing.
For instance, let's say that I have to interpret a 'function'  expression like this :
<<
int x=1
if (x < 10) then x=f02() endif
return x
>>

where f02 is also 'function expression' stored in a file for example,
and which definition is :
<<f02():int { return 25 }>>

Is is possible to have the original input stream changed to 
<<
int x=1
function f02():int {
 return 25
}
if (x < 10) then x=f02() endif
return x
>>

?

Regards,
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