🔒 My own interpreter

[low knot]

@noble crest

Python help channel opened

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[grim lily]

!paste

[low knot]

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[noble crest]

here's the code:

https://paste.pythondiscord.com/3AGA

[serene marlin]

whats your question?

[noble crest]

hold up

let me think abuot it for a sec

*about

i think the question is how do i detect an operation and then execute it

[serene marlin]

do you mean in the input? you want to parse the operations?

[noble crest]

i guess so

but its not with a parser

[serene marlin]

it looks like you're already sort of doing that

did you write this code?

[noble crest]

yes

my uncle helped me improve it

[serene marlin]

what part isn't working the way you'd expect it to?

[noble crest]

currently if i type an if statement it just wont work

cus there's nothing making it work

[serene marlin]

what do you mean by "wont work"? does it crash? what's the error? does it do nothing?

[noble crest]

no it just wont do anything

[serene marlin]

where are you typing the if statement? is this the code your interpreter is executing, or in python?

[noble crest]

what?

its an interpreter i wrote

[serene marlin]

sure

but what kind of if statement is this

[noble crest]

win
speed 0

x = 10

frd x
right 10
up
frd x
right 10
down
repeat 6 18

that's the code

[serene marlin]

what do you mean by if statement?

[noble crest]

that the interpreter is reading

[

[serene marlin]

ok, that answers my question

[noble crest]

say hi

]

if 1 < 3

that's the way

i want it to be wrote down

and then if 1 < 3 then it'll execute all of the code in the sqare brackets

[serene marlin]

what are 1 and 3 in this context?

[noble crest]

suppuse its a variable and a number

*supose

[serene marlin]

i'm still not really sure what you're asking

so you have code that's like [ say hi ]

[noble crest]

yes

[serene marlin]

and your interpreter parses this code correctly

but you're having trouble executing it?

[noble crest]

yes

[serene marlin]

oh you're calling [ an if statement in your code

i see

[noble crest]

having trouble with the logic

no

im calling [

a start point

and ] an end point

[serene marlin]

so what's wrong with [? what behavior do you expect to occur, and what happens instead?

[noble crest]

how do i execite all the lines inside the [] when somthing is true

something the user dicideds

*decides

[serene marlin]

how familiar with interpreters are you already?

[noble crest]

not realy

i know that's not how interpreters work

[serene marlin]

the way that i'd implement this is by using jumps

[noble crest]

what's a jump?

like in python

[serene marlin]

it's more of an assembly concept

so you have a list of instructions

[noble crest]

so how do i implement a jump in python

[serene marlin]

["x = 10", "frd x", "right 10", "up"]

are you familiar with lists?

and indexing them

[noble crest]

of curse

*of curse

i do have a list of all the lines ever executed

but how do i check if a statement is true without like 100 lines of code

[serene marlin]

you can imagine your interpreter as operating over this list of instructions

with an index that points to the instruction currently being executed

[noble crest]

i allready implemented that

with a repeat

[serene marlin]

after you execute an instruction, you increment your index by 1, which moves you to the next instruction

[noble crest]

there are loops

[serene marlin]

a jump (also called jmp or goto) is just an instruction that lets you jump ahead or behind by some number

[noble crest]

okay

[serene marlin]

so instead of index += 1, maybe it's index += 5 to skip over 5 instructions

so in your if statement

[noble crest]

okay my problem is detecting if the statement is true

[serene marlin]

what problem are you having with that

[noble crest]

with the logic

of how od i come up with an algorithm to do it

[serene marlin]

where does the statement come from

[noble crest]

a txt file

[serene marlin]

what does a statement look like

[noble crest]

[

say hi

]

if x < 3

[serene marlin]

ok the x < 3 is the important part

where does x come from

[noble crest]

yes

i have variables implemented

[serene marlin]

if you really want to do it simply, you can use a function called eval

!e ```py
my_vars = { "x": 5 }
x = my_vars["x"]
print(eval(f"{x} < 3"))

[low knot]

@serene marlin :white_check_mark: Your 3.12 eval job has completed with return code 0.

False

[noble crest]

what?!?

[serene marlin]

otherwise, yes, you need to write a bit of code to do expression evaluation. similar to what you have in _math

[noble crest]

that's like cheating for me, i never knew this existed

[serene marlin]

you shouldn't use it outside this context

[noble crest]

thank you so much, let me try it

[serene marlin]

if you misuse it, it's possible to introduce remote code execution vulnerabilities

but in this case, you're the only one using your code so it's fine

but if you had a web server it would be bad

[noble crest]

does it work with and/or/not

?

[serene marlin]

!e ```py
print(eval("True and False"))
print(eval("True and True"))

[low knot]

@serene marlin :white_check_mark: Your 3.12 eval job has completed with return code 0.

001 | False
002 | True

[noble crest]

like omg thank you so much

🙏 🙏 🙏 🙏 🙏 🙏 🙏 🙏 🙏 🙏 🙏 🙏 🙏 🙏

[low knot]

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