### What Is This? **TempleScript** is a programming language for and with semantic networks. It is currently developed to help with asset management, cloud storage and processing, and procurement in commercial settings.

### Hello World Example * expressions evaluate from left to right. always. * the pipe operator `|` passes a tuple of values (or even a block of tuples) to further processing downstream * `io:write2stderr` is the QName for a predefined function (a topic itself) * the incoming tuple is used as parameters for the function to evaluate * `#` introduces comments (until the end of line) . ( "Hello World" ) |->> io:write2stderr \# write a string to STDERR

### Real World Example * maintain a local CPAN mirror (Perl archive of distributions) * `mc` is the prefix of an ontology holding minicpan functionality * `fs` is the prefix of a file-system ontology (move, copy, etc.) * `cpandb` is the prefix of an ontology for a SQL database backend for CPAN data (modules, distros, ..) * `web:mirror` is a stream to mirror web contents locally * junctions are (*very* generalized) for-loops to introduce variables * string interpolation is using { ... } to embed dynamic content . fork-mirroring isa ts:stream \# streams run concurrently within the process return <+ 10 mins +> \# we wait for 10 mins to not overload the startup |-{ \# start junction (generalized transaction) (1, mc:mirror-cpan ~[templescript/map]~>, \# find code of this function mc:mirror-cpan / log_info ) \# find logging color for this function |->> ts:fusion (ts:forks) => $bg \# create background (forked) process ||><|| \# do do not wait for that below to terminate <<- never | @ $bg \# which it never will }- \# effectively we started a background process mc:mirror-cpan isa ts:function \# code we mentioned above log_info : "{ color => 'red' }" ^^ lang:perl \# will evaluate to a Perl HASH return { \# function code is itself a topic map RECENT-mirror isa web:mirror \# shortcut for a stream to poll for changes = file:/tmp/cpan/RECENT \# this makes sure that there is a local copy ~ http://mirror.easyname.at/cpan/RECENT \# remote copy on CPAN server, any will do holds at most every 600 secs \# frequency of polling, not faster than this mc:watch-to-mirror-packages isa ts:stream \# another local stream return <+ file:/tmp/cpan/RECENT +> \# whenever this file changes |->> mc:mirror-packages ( remote-cpan =, \# run this function (it will copy new distros) "{ local-cpan = }minicpan/" ) | ( "{ $0 } changes in minicpan" ) |->> io:write2log \# report in the log mc:watch-minicpan isa ts:stream \# and another stream return <+ file:/tmp/cpan/minicpan/ +> \# if the contents of the distro directory changes | ( $1 ) \# we are only interested in the file name |-{ ( "dbi:SQLite:dbname=/tmp/cpandb.sql", "{ $0 }../cpandb.sql", "{ $0 }/modules/02packages.details.txt.gz" ) => $dbi, $final, $packages \# compute these for the transaction below }-{ ->> fs:file-remove ( "/tmp/cpandb.sql" )\# make sure any old tmp is removed | ( $dbi ) |->> cpandb:assert \# create a new one from scratch \# stream the packages file after skipping first 9 lines, in batches of 10000 lines | ( $packages ) | ~~[text/plain;blocksize=10000;skip=9]~~> |->> cpandb:add-modules ( $dbi ) \# add a block of modules |_| count \# here we wait until ALL blocks have been added | ( $dbi ) |->> cpandb:index-up \# CREATE INDEX ... in the underlying SQL database |->> cpandb:detach \# commit and disconnect | ( "cpandb reindexed" ) |->> io:write2log \# report in log \# overwrite current database with updated version |->> fs:file-atomic-move ( "/tmp/cpandb.sql", $final ) }-| ( "cpandb run finished" ) |->> io:write2log \# report in log }

### Language Paradigms * knowledge-based using semantic networks (Topic Maps) * tuple sequence processing, functional, with possible side effects * reactive processing, causality or data driven * asynchronous processing, reacting to signals, clocks and other events * virtualized storage techniques (memory, databases, file systems) * virtualized processing techniques (processor cores, clusters, clouds) .