Split a qualified topic into package and topic

Splits "pkg::topic" (or "pkg:::topic") into its package and topic components. The prefix is only treated as a qualifier when it is a syntactically valid package name, so aliases that merely contain :: (e.g. S7 method aliases like "speak,foo::Dog-method") are left intact.

Usage

topic_split(topic)

Arguments

topic

A single string.

Value

A list with elements package (a string, or NULL if the topic is unqualified) and topic.

Examples

topic_split("stats::rnorm")
#> $package
#> [1] "stats"
#> 
#> $topic
#> [1] "rnorm"
#> 
topic_split("rnorm")
#> $package
#> NULL
#> 
#> $topic
#> [1] "rnorm"
#> 
topic_split("speak,foo::Dog-method")
#> $package
#> NULL
#> 
#> $topic
#> [1] "speak,foo::Dog-method"
#>