Building a Parser from scratch. Lecture [2/18]: Numbers | Strings

[@DmitrySoshnikov-education]

⭐ *New Coupons:* www.dmitrysoshnikov.education/p/parser-from-scratch/?coupon_code=RDP5_29 | www.udemy.com/course/parser-from-scratch/?couponCode=EF968F0D3A9E74891DDC

[@edwingarcia5043]

People help me: The part s += this._cursor++ // skip " This is adding the length of the string to the variable "s" So: string = 'ok' Results in: 'ok4 the closing quote is not being included, but I try with this: s += string[this._cursor++] // skip " And it works now.

[@DmitrySoshnikov-education]

Great catch on the typo! And yes, your solution is correct. That is also why we switch to automatic regexp tokenizer, to avoid manual handling and typos like this.

[@SillyNaughty]

These are excellent content! Naming variables "string" and "number" tho... super naughty

[@DmitrySoshnikov-education]

Thanks! That's why they are switched to generic tokens in the next video ;)

[@tylergoodwyn1534]

Your courses are amazing. Looking forward to this series

[@DmitrySoshnikov-education]

Thanks, glad you like it, and glad to see more engineers interested in deeper topics.

[@TarekkMA]

Thanks a lot for this awesome series. You are amazing.

[@philperry6564]

Do you teach how to code a Parse generator in your Parsing Algorithms course or do you use an existing one? If not, do you have a course or recommend one or a book that shows how to do that?

[@DmitrySoshnikov-education]

The "Parsing Algorithms" class is a combination of the theoretical part covering automatic parsing techniques (LL, LR), and the practical part - building a parser using Syntax tool (the language-agnostic parser generator). From the first part you would understand how to build a parser generator, but we don't go into detailed implementation, mainly high-level theory. This theory should be enough though to build your own parser generator.

[@philperry6564]

@@DmitrySoshnikov-education Sounds good, will probably buy your course next month.

[@supersim1357]

To solve the homework, we could simply add the condition: || string[0] === "''", to the initial if statement in the tokenizer then simply change the while statement from: while[string[this.cursor] !== '"' && !this.isEOF()); to while[string[this.cursor] !==string[0] && !this.isEOF());

[@DmitrySoshnikov-education]

That's good one, congrats! Also, in the following lectures we switch to automatic (RegExp-based) tokenizer which does this under the hood.

[@supersim1357]

@@DmitrySoshnikov-education I appreciate your feedback

[@JorgeLopez-ec2bn]

Very interesting videos. Why are some of them (i.e. Lecture 3) marked as private?

[@DmitrySoshnikov-education]

Hi Jorge, you can enroll to full class here: dmitrysoshnikov.com/courses/parser-from-scratch/

[@JorgeLopez-ec2bn]

@@DmitrySoshnikov-education Thanks for your response but that's a pay option. Nothing against it but I thought it was a problem with the video.

[@smkshep]

why are some of them now unlisted/private, for example 3rd part? :( awesome videos dude!

[@DmitrySoshnikov-education]

Thanks, glad you find it's useful. The full course is now available at dmitrysoshnikov.com/courses/parser-from-scratch/

[@ChillerDragon]

@@DmitrySoshnikov-education seems like your ssl expired o.O

[@ivandrofly]

4:24

[@DanielTateNZ]

Number.isNan isn't a function... shouldn't it be isNaN? This tokenizer doesn't seem to work at all. Since out of index is undefined it should be something like while (!Number.isNaN(Number(string[this._cursor]))) {

[@DmitrySoshnikov-education]

Yes, it's isNaN of course, see 3:36. Glad you figured this out - this lecture is also transitional between the RegExp based tokenizer.

[@imfastboi]

Oh .... I'm Kinda disappointed since the videos were on KZbin I thought that I would be able to find the whole course but it's paid ... I'm not saying that you selling your courses is bad because everybody needs to live but I just didn't understand from the start that it was supposed to be paid .

[@xspydazx]

some of the videos were actually up for a while but i think he took them down , all the videos he is sharing are actually here... the rest are on the courses blocked off. github.com/spydaz/SpydazWeb-AI-_Emulators/tree/master/LexParseEval i began making here in visual basic ... After a while you will begin to figure out from the different project he has on GitHub (Letter & Eva + Syntax)... from the BNF files ... you will find all the Regex you need there and if you use java you can generate the tokenizer/parser...... and following the essentials of interpretation bits you can begin the eval function ... as the processes are the same as well its possible to create a mini lang.(I don't use java so its not a course for me to enjoy)....but it looks very good ... you may need to watch the videos a few times ....

[@DmitrySoshnikov-education]

⭐ *Enroll:* dmitrysoshnikov.com/courses/parser-from-scratch/ 📚 Udemy: www.udemy.com/course/parser-from-scratch/?referralCode=E3BF78C54F214B02775E 👉 DS Education: www.dmitrysoshnikov.education/p/parser-from-scratch/

[@hellamaxine]

Will you make the other lectures available on KZbin for free?

[@messiahwesley2418]

Sorry to be offtopic but does any of you know a way to log back into an instagram account..? I stupidly forgot my password. I appreciate any tricks you can offer me.

[@daviddustin1773]

@Messiah Wesley instablaster ;)

[@messiahwesley2418]

@David Dustin Thanks so much for your reply. I got to the site through google and I'm in the hacking process atm. Looks like it's gonna take quite some time so I will reply here later with my results.

[@messiahwesley2418]

@David Dustin It worked and I actually got access to my account again. I am so happy! Thanks so much you really help me out!

[@babakfp]

OMG, it's soooooooooooooooooooooooooo hard :/

[@edwingarcia5043]

Yeah! Btw did you improve in doing this? Or did you just stop learning about parsing?

[@babakfp]

@@edwingarcia5043 I was learning to create a parser for the Prettier and then to create a prettier plugin for EJS. I stopped learning it because I lost interest...