normalize_lccn {libbib}

Attempt to enforce validity of LCCN and convert to normalized form

Description

Takes a string representation of an LCCN. Returns a normalized one

Usage

normalize_lccn(userlccns, allow.hyphens = TRUE)

Arguments

userlccns

A string (or vector of strings) of LCCNs

allow.hyphens

a logical indicating whether hyphens separating the year and serial should be handled. Adds complexity and time to the function. (default is TRUE)

Details

Normalization procedure is documented here: https://www.loc.gov/marc/lccn-namespace.html

This does not include revisions or use "#" as a padding character The normalized LCCN is not always the same number of characters

Value

Returns valid LCCN if possible, NA if not

Examples

normalize_lccn("n 78890351 ")                  # "n78890351"

normalize_lccn("###78890351#")                 # "78890351"

normalize_lccn(" 79139101 /AC/r932")           #  "79139101"

normalize_lccn("85-2 ")                        #  "85000002"
normalize_lccn("85-2 ", allow.hyphens=FALSE)   #  NA

# vectorized
normalize_lccn(c("85-2 ", " 79139101 /AC/r932", "n 78890351 "))
# c("85000002", "79139101", "n78890351"))