Library, mostly Java, with all sorts of useful code pieces and courageous attempts by myself. In particular it has

• some persistent data structures: B-trees, sets, maps, ropes, priority queues

• primitive data types, including primitive sets or maps, which is actually generated by a script.

• a pair type for generic use, and a 'tuple type' called Fixie...

• an re-implementation of streams. This 'streamlet' implementation, unlike Java streams, do not drain up upon the first retrieval; and it provide a 'key-value' based stream (Streamlet2) which is more suitable in map processing.

• a generic lexer and parser for an operator-based grammar, which is adapted around the repository

• some other parser generators, LR and top-down

• some functional programming language interpreters and compilers, current one and a previous one

• some logic interpreter (a.k.a. Prolog) and compiling them into Java lambdas

• B-tree implementations, and a lazy one

• some numerical algorithms, BFGS or what...

• stock quote readers, some stock indicator calculations (and some dangerous quantitative strategies that could not earn me money)

some code come with simple JUnit test cases, in src/test/java folder.

Most often I come to a new book in library, tried to grasp some ideas from it, and write something new into this repo. Obviously I am a wheel-reinventer. You can see I tend to write the same thing again and again, and I hope I learnt something through the process.

Recently I was thinking about a new name for this muddle of stuff... maybe call it 'pointless', or call it 'dangerous' :-) lots of rename refactoring need to be done though.

An enthusiastic programmer, with some computer science, maths background. I write Java for living (curriculum vitae).

Get following reasonable things ready:

• Linux, unix, or cygwin
• git
• openJDK
• Apache Maven
• eclipse
• rlwrap if you want more command-line convenience

Import the Hong Kong Post root CA:

curl -sL http://www1.ecert.gov.hk/root/root_ca_1_pem.crt > /tmp/root_ca_1_pem.crt keytool -import -trustcacerts -keystore ${JAVA_HOME}/lib/security/cacerts -storepass changeit -alias hong_kong_post_root -file /tmp/root_ca_1_pem.crt

Check-out and execute run.sh. It builds Java code, and performs some pre-compilation.

Execute command mvn eclipse:clean eclipse:eclipse and imports the project into any workspace.

printf '? dump something, nl' | ./run.sh --quiet

./run.sh evaluate 'true'

printf 'inputs...\ninputs...\n' | ./run.sh filter reverse

./run.sh --use MONAD filter --do 'concatm . map {sh/ {}} . split {10}'