matchfuns: Matching functions

In registry: Infrastructure for R Package Registries

Description

Functions used for lookups of search keys.

Usage

match_ignorecase(lookup, entry, ...)
match_exact(lookup, entry, ...)
match_partial(lookup, entry, ...)
match_partial_ignorecase(lookup, entry, ...)
match_regexp(lookup, entry, ...)

Arguments

lookup	Search value to look up (for some key field).
entry	Vector of key values where lookup is sought.
...	For match_ignorecase and match_exact: currently not used. For match_partial and match_partial_ignorecase: additional arguments passed to pmatch. For match_regexp: additional arguments passed to grep.

Details

These are matching functions to be specified for key fields, controlling how search values are looked up in the registry.

Author(s)

David Meyer [e-mail]

See Also

regobj

Examples

## use exact matching
R <- registry(stop_if_missing = FALSE)
R$set_field("Key", type = "character", is_key = TRUE, index_FUN = match_exact)
R$set_field("Value", type = "numeric")
R$set_entry("the key", 1)

R[["the key"]]
R[["the"]]

## use partial matching
R <- registry()
R$set_field("Key", type = "character", is_key = TRUE, index_FUN = match_partial)
R$set_field("Value", type = "numeric")
R$set_entry("the key", 1)

R[["the"]]

## use regular expressions
R <- registry()
R$set_field("Key", type = "character", is_key = TRUE, index_FUN = match_regexp)
R$set_field("Value", type = "numeric")
R$set_entry("the key", 1)
R$set_entry("key", 2)

R[["k.*"]]
R["k.*"]

registry documentation built on May 1, 2019, 8:23 p.m.