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import gleam/list
import gleam/string as str
import gleam/set.{type Set}
pub fn parse_grid(lines: String, with constructor: fn(Int, Int) -> a) -> Set(a) {
lines
|> str.split("\n")
|> list.index_map(with: fn(line, y) {
line
|> str.to_graphemes
|> list.index_map(with: fn(grapheme, x) {
case grapheme {
"#" -> [constructor(x, y)]
"." -> []
_ -> panic
}
})
|> list.flatten
})
|> list.flatten
|> set.from_list
}
|
