WeBWorK::EquationCache - create and cache images of TeX equations.
my $cache = WeBWorK::EquationCache->new(cacheDB => "/path/to/equationcache.db"); my $imageName = $cache->lookup('\[3x^2\]');
WeBWorK::PG::EquationCache maintains a list of unique identifiers for TeX strings. The unique identifier is based on an MD5 hash of the TeX string, and a sequence number. Before calcuating the MD5 hash of a TeX string, all whitespace is removed.
The cache database file is a text file consisting of lines of the following form:
md5_hash sequence_number tex_string
Any amount of whitespace may separate the fields. Lines which do not conform to this format are ignored. Any string of characters beginning with `#' and extending to the end of the line is also ignored.
Returns a new EquationCache object.
%options must contain the following entries:
cacheDB => path to image cache database file
If cacheDB is the empty string, don't use a cache file and assume that there are no md5 collisions.
Looks up a TeX string in the database. A unique identifier for the cached image is returned. If necessary, the string is added to the database.