After watching so much "clean code" and "good standards" and "being production ready" in youtube, this feels refreshing. A down to earth coding session for a fun project.

2:35 This does work, however `&&` in bash will only execute the second command (your echo) if the exit code of the first program is `0`. In your case the exist code is `2`. For this use case, you want to use a semicolon (`;`) instead of `&&` to chain the commands, to have your `echo` run regardless of the first programs exit code.

this is peek content

I think the function peak has to be renamed peek at both files, since peak means the top and peek means to look ahead.

19:18 Bjarne once said: "There are only two kinds of languages: the ones people complain about and the ones nobody uses"

To be honest this is a great video. I have a ton of experience from software development but I never tried to make my own compiler. This guy just goes at it. "it's just another program" love the mentality that nothing is too hard to do.

I really hope you continue this series! its been so fun to stumble along with you

In your Peek() functions, you're not using the 'ahead' value when retrieving the character/token using the .at() function. This could lead to some problems down the road, if it isn't already. Also, afaik from previous attempts at doing this sort of thing, it's a good practice to make sure there's a new-line at the end of the file when you load it (or just add one to the loaded text) so your tokenizer doesn't miss the final token. Could be worth looking into. Loving these videos though!

This is one of the most interesting series I've seen on KZfaq. Just perfectly paced, understandable, great presentation. Thank you.

This is *peak* () entertainment

This series is so much fun and so interesting. It makes me feel so smart

I love these vid. i just finished the last one. it was the perfect video to watch after taking the final to computer system and architecture. biggest part of our final project was writing an assebler, so your vid felt perfect to watch next

This Video series is a great source of learning. Thanks for making. Keep Uploading More Videos like this

this is a great series, i just finished the last video, excited to watch this one

loving this series so far

The fun to come in parsing is that infix/prefix expressions (why would anyone do postfix in current year?) is done via pratt parsing while statements are parsed via recursive descent or GLR. Wish you good luck and don't let the modern C++ features bring you down!

yo this series is awesome. i love programming

finally a youtuber that listens. ggs

Such a well done series, looking forward to the upcoming parts. Will you ever use the ahead parameter or your peak (peek) functions?

Again, good video. This can be such a good series!

Such a great series ! ❤

9k views with

This guy makes my adderall sleepy

2:40 possibly the main issue why it did nothing is that && operator executes the next command when the left command ends successfuly (exit code 0) but you are using all sorts of numbers to test it, which however results in basically error as far as the shell is concerned so it does not call echo at all.

really loving this series ! 🔥

Hey! Nice explanation dude! This vids should become more rated!

Nice video:) never tried doing something like this but might just try myself sometime. Some small things I noticed; Modern C++ prefers stringviews over passing const string references. This prevents any copies being made. And since this is a video about writing a compiler… splitting your header files and impementation (CLion can do that quickly for you) can speed up your compilation of your compiler dramatically 😛

commenting second part lessgo didn't found any other sussy timecodes 44:20 malloc & free 29:40 lisp langs looks like perfect AST example, they even don't need much explanation: (display (+ 1 (* 69 (- 10 2)))) 11:50 void type exists for no return 10:43 yay my sugesstion from part 1 was mentioned 8:40 you can return '\0' char

Loving these videos, as someone who enjoys tinkering and making their own strange languages it's fun! I would say, do you not think for the nodes instead of prefixing with Node it would look better post-fixed with Node? Such as ExitNode, ExprNode. Also, exit in C is defined in cstdlib and is a function (that the compiler does funny things to when it is using due to there being no way to actually express an exit). Maybe lexing and parsing a function call would be better in the long run here. FnCallNode could contain a vector and then it scales a bit. Then you can just hardcode checks for the function name for now to mess. Anyway, good video bro keep em coming

Hey, great series of videos, looking forward for this compiler series. What's your CLION theme? Keep up the great work, and informative series!!!😀

46:08 in VSCode it's Alt+Shift+up/down arrows to move lines and Ctrl+L to select multiple lines before moving. Not sure if it's the same in CLion.

Lol "an abstract syntax snake". Great video, but If one is serious about wanting to learn to write programming languages I recommend learning to compile to C or LLVM. Both of those are cross platform and will generate fast code. Assembly is cool, but really niche at this point and creates countless platform headaches. Btw for those who are scared of C++ one can still write a compiler in python or javascript, and when that is done one can make the compiler self-compile. The best languages IMO for doing this is F# or Rust both have advanced pattern matching and great debugging and testing frameworks.

I'm seriously sure you get bounds checking with array lookup of an stl vector, ie using []. Its the same thing.

Great video, Tsoding!

I had the same is never used when I used CLion. It was always annoying, and there doesn't seem to be a way to fix it.

Had a project to make a language in Java while in school, so this is going to be interesting to follow to see what choices you make! btw, "./out ; echo $?" should work for a one-liner. it'll run the first command before the second rather than together.

Great one. Pls keep up thnx 🥰

@Pixeled When you edit the test.hy file, why did you need to recompile?

this is peek content (bah dum tss)

What exactly will be the product that will emerge at the end of these videos?

just finished watching pt1. lol

Dumb question, but what's that font for code called? I see it sometimes but forget it

28:40 when you got to this point shouldn't you have written tests to make sure your compiler stays in a working condition?

Do all high level languages generate Parse Trees? I once was in a group project writing a compiler for Prolog in Haskell and we also had to implement sld-resolution, so thats why i wonder?

Awesome ❤

Cant you just include everything in a precompiled header and include the pch everywhere (ofc while keeping pragma once)?

Wonderful! 👍

12:00 A "const" method could have side effects such as modifying a "mutable" member.

55:34 another compiler of course

Why has no one pointed out that the off by one in peek was because you're checking one ahead for end of string/vector while actually peeking the current character/token. The amount to peek should default to 0 and you should return the character/token of index+amount. Now the amount does nothing and your peek is only accidentally complete when you check if peek+amount is larger than length/size.

FYI, if you want to do ./out and echo $? on the same line. Use a semicolon insead of && as this: ./out; echo $?

./out $$ echo $? fails because the return code of ./out is non zero. (It doesn't execute following commands if the command fails) What I tend to do is to put them in a bash script and just run the bash script.

You can define the functions without inline. all inline does is tell the compiler to inline the functions contents directly into the place where you call it.

part 3 when?

every time there is a big change in the code i get about 30 errors and i never know what it wants cuz my compiler is broken

This is great

when you use [] if the item in the vector/array/list doesnt exist, itll add it to the vector/array/list. So .at is just a lot better.

2:37 Using && only runs the right hand side if the left hand side was 0. You can run both on one line the way you want by using a semicolon instead, like this: ./out; echo $? 1:03:42 i feel like not inlining everything in headers could've avoided this :^) you'd only need to include the bare minimum in the headers themselves, and then can include everything you need in just the .cpp files

33:10 yeah, and we though C++ was bad, its just a mini-boss.

so... I have been refreshing the channel page every 20 mins on average since i watched this video. just for pt. 3 I have pt. 1 & 2 done before and the explanation was good. JUST the last step is missing for me. How I get the tree to do stuff... EDIT: I do not need _optimized_ code, i need _explained_ code. This is well explained (with some very minor hiccups, : D so cute). [+ minor edits on the phrasing]

I am pretty sure that peak in your context, is actually spelled peek btw

Why do you else after a continue at 1:05?

Making a snake from a pe*is made my day

@12:05 "Hey it's C++, you know how it works!" - nope

I would write my compiler in JavaScript, since then no one would have to bother with C-Make and all that other stuff. There are a lot of drawbacks to using JS, but at least it is a lot simpler to run.

let's gooooo

I think this stream would be 2x if he did this with pair programming. Feel free to steal my ideas.

hey your compiler playlist is backwards

What clion theme?

You missed the joke about the ASS - Abstract Syntax Snake

2:38 ./out; echo $?

He is I guess the first person I ever watched that uses #pragma once, clean code standards are truly something for him..

17:40 petition the rename unpeek to regurgitate.

Do you heard about two programs called "yacc" and "lex" ? :|

wonder what is ur keyboard setup?

tsoding from wish kinda goes hard ngl.

you shouldnt need any of the inlines, methods defined directly in the class body are implictly inline and shouldnt cause any ODR violations

21:31 Same

I would make way more utility functions, like `consumeWord` or `consumeDigits`

Bro i think i am too noob. Still i will make my own compiler

By the way, that's not what the inline keyword means in c++.

Do you have any plans of making your programming language self compiled?

Ur so cute

it's "peek" not "peak"

liked and subbed for the pp

28:13 almost fixed it 🙃

Making your member functions inline when you define them directly in the class is redundant, they're already inline. And inline is not a performance related specifier, it's not about inlining, it's about making something avoid the ODR.

Hi

9:05

wrt pragma once please read cpp core guidelines SF.8!

Nice video, but You messed up!

Great video, but if you really want to bridge the gap to the metal, why not directly emit x86 opcodes/operand bytes with a InstructionBuilder abstraction or something and construct an ELF file around that? That removes the last bit of magic imo. Also whenever your compiler stringbuilds instead of going to an IR (or in the final step machine code), you are probably doing something wrong. The only people who have a license to construct compilers THAT horible are the ML compiler people writing everything in python 🙃🙃🙃🙃

when I see him using c++ I reallize that java would be perfect if it compiled to an executable... 😅

32:48 “…and we’re talking about a formal grammar here, not just your, you know, your simple English grammar like what even is that; English is all confusing. Are there even rules to it at this point there are so many exceptions…” I LAMO’ed when I heard this cause I’ve thought about how terrible English is as well (sometimes I text using parenthesis to group the words to prevent confusion or include sub-notes like what I’m doing now). Lol

create a makefile to make things easier

for a guy who's using c++ he seems to really hate c++

Great Video, but i noticed how you moved values AFTER already passing them by copy, which obviously defeats the pprpose of moving

consoome()

“This will be inline too just because I don’t like writing things in separate files” I don’t think that keyword means what you are implying it means 🤔

Nice series but code is sluggish at best and painful to watch, hope this improves cause the subject is really complex..