Python List Comprehension for Better Error Reporting in My Language — Porth Ep.02

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[Dman]

Im only on episode 2 but i love the programming language creation series. You earned my sub!

[flleaf]

24:12 i like how he worked with C for so long that he automatically calling things like that dangerous

[friendlygrass]

Regex matching in python returns the start and end index of the match. So that might could be helpful here.

[lencone]

I know I'm late and that this language is pretty advanced already, but for those who are late like me, just know that lexing should'n've been that complicated. The snipped below should accomplish the same.

def lexline(line):
x = []
for token in line.split():
col = line.index(token)
x.append((col, token))
return x

def lex(filename):
with open(filename, "r") as f:
return [(filename, str(row + 1), str(col + 1), token)
for row, line in enumerate(f.readlines())
for col, token in lexline(line)]

[alexandersnow]

At some point, you will run out of possible combinations of available integer values to sum to 420 or 69

[YannBOYERDev]

I'm now writing my compiler for the programming language I designed back when I was in high school(I'm mostly 19...), I'm writing it in Python, I could have used C or Rust or even C++ but I prefer to use Python.

[neonblood]

Watching you after a long while, boy have you lost some weight.

[MuravaDnevnik]

Брат, ты топовый! Сделай пожалуйста пару уроков на питоне для таких тупых как я! На английском ваще классно, так даже понятней 👍👍👍

[Maik.iptoux]

What happens when I put "34 35 36 + ." In source file, will it sum up the things?

[pizzapanni]

Hey Tsoding, what keyboard do you use?

[andy_lamax]

I wish porth was written in C instead of python

[MrRyanroberson]

26:57 what i would do here is change the first argument into a function. then you can do various things (where some . methods are surrounded by underscores): ' '.eq - this is the method which, when you call it on something, tells you whether ' ' is equal to it. Another function: str.iswhitespace - this, when you call it on a string, returns true for whitespace. by abstracting the function in this way, to take a function as an argument, you can also repurpose the function for other things, like taking integers (str.isdigit or '0123456789'.contains), or taking arbitrary clusters of chars (yourchars.contains)