On 11-03-15 9:10 PM, Hadley Wickham wrote:
Could getSrcFilename() gain a default argument so that
getSrcFilename() would by default return the path of the executing
script?
No, it needs to see a function defined in that script.
But I thought default arguments were evaluated in the parent
environment? Does that not follow for source attributes as well?
No, defaults are evaluated in the evaluation frame of the function.
That's why you can use local variables in them, e.g. the way rgamma uses
1/rate as a default for scale.
But the point isn't evaluation here: the point is the parsing. A
function gets its source attribute when it is parsed, so getSrcFilename
needs to be passed something that was parsed in the script.
Duncan Murdoch
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