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Avoid creating a new string every time by using a HashSet for disallowed characters

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Maximilian 2023-01-24 12:26:18 -06:00
parent f832fda590
commit 10411bbdcb
1 changed files with 6 additions and 3 deletions
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9
src/main.rs
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@ -1,3 +1,4 @@
use std::collections::HashSet;
use std::env; use std::env;
use rand::RngCore; use rand::RngCore;
@ -20,15 +21,17 @@ fn main() {
// Disallowed_chars is an optional argument // Disallowed_chars is an optional argument
let disallowed_chars: Option<&String> = args.get(2); let disallowed_chars: Option<&String> = args.get(2);
let mut allowed_chars: String = String::from("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890-=`~!@#$%^&*()_+[]\\{}|;':,./<>?"); let allowed_chars: String = String::from("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890-=`~!@#$%^&*()_+[]\\{}|;':,./<>?");
let mut allowed_chars_set: HashSet<char> = allowed_chars.chars().collect();
// Remove disallowed characters from allowed_characters if disallowed_chars is specified // Remove disallowed characters from allowed_characters if disallowed_chars is specified
if let Some(disallowed_chars) = disallowed_chars { if let Some(disallowed_chars) = disallowed_chars {
for disallowed_char in disallowed_chars.chars() { for disallowed_char in disallowed_chars.chars() {
allowed_chars = allowed_chars.replace(disallowed_char, ""); allowed_chars_set.remove(&disallowed_char);
} }
if allowed_chars.len() == 0 { // Make sure there are still characters left to use if allowed_chars_set.len() == 0 { // Make sure there are still characters left to use
println!("Error: You have disallowed all characters"); println!("Error: You have disallowed all characters");
println!("The allowed character set includes: abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890-=`~!@#$%^&*()_+[]\\{{}}|;':,./<>?"); println!("The allowed character set includes: abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890-=`~!@#$%^&*()_+[]\\{{}}|;':,./<>?");
return; return;