gtfsio | Read and Write General Transit Feed Specification | Web Services library
kandi X-RAY | gtfsio Summary
kandi X-RAY | gtfsio Summary
gtfsio offers tools for the development of GTFS-related packages. It establishes a standard for representing GTFS feeds using R data types based on Google’s Static GTFS Reference. It provides fast and flexible functions to read and write GTFS feeds while sticking to this standard. It defines a basic gtfs class which is meant to be extended by packages that depend on it. And it also offers utility functions that support checking the structure of GTFS objects.
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QUESTION
I'm trying to create a toy R REPL written in R (here's the source code). Ideally I'd like the REPL to run in an R terminal itself, but neither to interfere nor to depend on anything that has already been evaluated at the global environment. Unfortunately, I haven't been able to do come up with a solution to this problem yet. One of the main challenges I'm facing refers to how package environments are attached.
According to Hadley's Advanced R, packages attached by library()
and require()
become parents of the global environment. This implies, however, that if I attach a package inside my toy REPL it will become the parent of the global environment even I'm not running it on the global environment.
For example (please note that the R>
prompt is the "normal" R terminal, and that >>>>
is my REPL's "terminal"):
ANSWER
Answered 2021-Jun-08 at 23:59You have only one search path so there's no way to properly attach to another one.
You can still have a chain of parent environments though, we might redefine library
in your repl_env
to set up this chain
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