Going on a journey

My life’s about to take a turn!



I got a ChromeBook the other day. I want to be able to dev using Browser based IDE that supports windows tiling and collaborative editing. I think it may be doable using Chrome App…


I’ve made terrible purchases since living alone. I should’ve avoided non-stick cookware from the beginning. I bought a non-stick wok which I used for everything (what a terrible mistake that was) and it just failed to do a proper job at anything as expected. Non-stick coating quickly wore off and seasoning it was a nightmare, not to mention unsafe. Then I bought a non-stick pan which was fine for a while, until I made the mistake of leaving it empty on stove that was on medium for 30 minutes. It had what looked like melted non-stick coating marks all over, which I tried to clean with salt WITHOUT OIL. I rubbed too hard with the salt DRY which got most of the stains off, but I think it completely ruined the pan (which I suspect was already ruined).

Then I bought a stainless steel pan, larger one for stir-fry and general purpose. First attempts at frying egg ended up in terrible mess with egg sticking everywhere. Then I tried seasoning it with veggie oil at high heat and I had almost the non-stick -like pan without all the teflon. Seasoning is pretty delicate thing — I am still learning how to make a good seasoning. I will probably trash the non-stick wok and pan I bought since they’re not only terrible at their jobs but also dangerous in my health because of the residues that go into the food. I learned that adding stir-fry sauce and simmering is not that great for the seasoning. Subsequent cooking of egg on the stainless steel pan was not that great. I don’t know if this is because of acidic properties of soy sauce or my scrubbing was too hard with hot water.

However, I like stir-frying and it seems like the pan can’t do both. I might just get another stainless steel pan for frying eggs :/.

Making Compiler: Lexer (Continued) and Parser

Latest progress…  I’m well into the parser now, for which I estimate I’ve done 35%-ish. It’s actually gotten a lot more fun as it feels like coding building blocks that work together nicely. The hand written, recursive descent parsing takes a bit of effort for debugging ambiguities and understanding what is going on, but at least it is fun. Initially I suspected recursion depth _might_ be a problem, but seeing the testcases, I suppose it’s not that big of a deal (at least from my unit tests).

Some excerpts:

Screenshot from 2015-03-14 02:32:02 Screenshot from 2015-03-14 02:32:48 Screenshot from 2015-03-14 02:32:53Screenshot from 2015-03-14 02:35:53

Compiler: Motivation for my own toy language and Handwriting Lexer


I wanted a language that combined the likeable features of Python, C, and functional programming. I replaced somethings in Python such as ‘:’ and indent for braces and kept heterogeneous element containers. I especially liked how Python exposes fundamental container data types so natively, so I kept all the brace notations such as [],(),{},set(). Grammar is still being worked out, to add more desirable features that Python lacked such as operator overloading (variable length operator too!), complex switch statement, and perhaps more functional list comprehension which I dubbed as iterator, which works more like Mathematical set notation.

Imagine if you could write code like

for {float f| |f| < 10, stepSize(0.01), isReal, otherFilters}
//do stuff with f

I had to revive my old memories about writing a lexer, from days of university. At the same time, I wanted to practice using C++11 features. I decided to handwrite a lexer using C++11 features. I unfortunately did not implement the main logic using NFA->DFA transformation for additional performance, but I suspect this won’t be a typical performance bottleneck in the pipeline.

Screenshot from 2015-03-08 01:59:51

Stop pulling hair out with git

To help understand how git works, I scrambled this post on what I know about simple workflow in git. I first started my project locally and then I added VCS using ‘git init’ in the existing project’s root directory.

Then I wanted to host it on github. I did this by creating
git push -u https://github.com/choikwa/gitTest.git

But if I want to skip adding “-u https://github.com/choikwa/gitTest.git” everytime I push, I can do:
git remote add up https://github.com/choikwa/gitTest.git

If I want to compare my local current branch commits to my remote’s branch, I need to do:
git branch –set-upstream master up/master  //replace master with your branch

To see your tracked files:
git ls-files

To see your modifications, here is neat coloured output:
git log –pretty=format:”%Cblue%h:%Cred%ce: %Cgreen%s” –name-status –graph

Make alias of above in your .gitconfig in default home directory.
hist = log –pretty=format:\”%Cblue%h:%Cred%ce: %Cgreen%s\” –name-status –graph

A common thing is to compare my local branch to remote for unpushed commits. You can do this by:
git hist origin..      //this is implied as git hist origin..master


The converse, “git hist ..origin” would show how far your remote is ahead in commits.