Grammar

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These grammars that we've been introducing describe something new context free languages.

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It relates grammars to parsing, which is one of the concepts in this class.

The set of languages that can be described by re write rules or grammers like this are called context free languages.

An interesting note that I didn't cover in this course, but that's nonetheless true, is that the particular parsing algorithm that we covered also runs in linear time, is very fast for the same small class of grammars LRK grammars they're called that are accepted by these faster tools.

This sentence is grammatically correct.

Here's a new quiz. The Great Grammar Fix Up.

Finite State Machines, adding a lexer that follows them automatically,

Units 3 and 4 were relatively abstract to some degree, intentionally so.

The sentence is not grammatically accurate.

So in lecture, we spent a lot of time learning about context free grammars and languages.

like HTML or SQL, the language of database queries.

3. How to insert a reference in a Word document.

Here I've written down four claims.

The problem with the wrote, wrote, wrote, de, de, de bag of words above is that they don't form a grammatical sentence.

It's your punctuation and grammar.

The sentence is free from grammatical mistakes.

In this multiple, multiple choice quiz,

One learns grammar from language, not language from grammar.

This makes us super sad.

So now it's time to make sure that you're following along with a quiz.

It handles LL. It handles LR. It handles LALR.

Unsurprisingly, the input will be (a b b c).

That line above it is the context.

The parsing approach that I've taught you in this class where we build up the chart of parsing states and memoized things can handle any of them.

Grammar is very complicated.

This is going to give us every right hand side where the left hand side is the symbol.

Often, we think of the function as return in just one value.

The real devil is in the details.

So we use another underscore, in being a little more specific.

Spells, enchantments.

This might seem a little counterintuitive but remember the glory of parsing, or the glory of context free grammars, is that a very concise grammar notation stands for an infinite number of strings.

Those acronyms are all subsets of context free languages or context free grammars.

We're doing all of this because we want to master parsing.

This is called being lazy, and it's a phenomenal virtue when you're writing programs.

And fortunately, using rule 5, T goes to b.

Next question is where do these trees come from?

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Well, Susan, this is a fine mess you are in.

(E gt to E E), and we've seen it all.

Let's test our knowledge of using shifting to fill out the parse table the chart.