These functions are simple convenience functions.
The function escapeHTML
converts HTML, such as $<$ into
a corresponding entity. The reverse is done unescapeURL
, so
named as such encoding is typically done in URLs.
The function asURL
simply adds the class URL
to a
character. This allows gWidgetsWWW to identify local URLs that
are not prefaced with http://
.
The function String
creates an object of class
String
. This class treats a character string as a vector of
letters. (That is, "abc" is c("a","b","c")
.) The method
c
can be used to combine strings. The more natural (in some
way, but not every way) +
method can also be used to join
strings. This is the primary convenience of this class. Otherwise, the
[
method is useful for string extraction. The length
method is an alternative to nchar
.
The need for temporary files that can be accessed through a URL
gives rise to the functions getStaticTmpFile
, which creates a
temporary file, and convertStaticFileToUrl
which returns the
URL from the name of the static temporary file.
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