core :: Text :: file_extension
Only the last extension is returned. There is no special case for combined extensions.
assert "file.txt".file_extension == "txt"
assert "file.tar.gz".file_extension == "gz"For file without extension, null is returned.
Hoever, for trailing dot, "" is returned.
assert "file".file_extension == null
assert "file.".file_extension == ""The starting dot of hidden files is never considered.
assert ".file.txt".file_extension == "txt"
assert ".file".file_extension == null
# Return right-most extension (without the dot)
#
# Only the last extension is returned.
# There is no special case for combined extensions.
#
# assert "file.txt".file_extension == "txt"
# assert "file.tar.gz".file_extension == "gz"
#
# For file without extension, `null` is returned.
# Hoever, for trailing dot, `""` is returned.
#
# assert "file".file_extension == null
# assert "file.".file_extension == ""
#
# The starting dot of hidden files is never considered.
#
# assert ".file.txt".file_extension == "txt"
# assert ".file".file_extension == null
fun file_extension: nullable String
do
var last_slash = chars.last_index_of('.')
if last_slash > 0 then
return substring( last_slash+1, length ).to_s
else
return null
end
end
lib/core/file.nit:1299,2--1325,4
redef fun file_extension do
var its = _items
var p = last_byte
var c = its[p]
var st = _first_byte
while p >= st and c != u'.' do
p -= 1
c = its[p]
end
if p <= st then return null
var ls = last_byte
return new FlatString.with_infos(its, ls - p, p + 1)
end
lib/core/file.nit:1363,2--1375,4