/
patterns.rs
185 lines (151 loc) · 4.39 KB
/
patterns.rs
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use std::{fmt::{Display, self}, vec};
use crate::char_sets;
#[derive(Clone, Debug, PartialEq)]
pub enum Token {
String(String),
Repeat(u32, u32, u32),
CharSet(String, usize)
}
impl Display for Token {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match self {
Token::String(s) => write!(f, "string: {}", s),
Token::Repeat(start, end, _) => write!(f, "repeat: {} -> {}", start, end),
Token::CharSet(ch_set, _) => write!(f, "char_set: {}", ch_set)
}
}
}
pub fn tokenize_format_string(input: &str) -> Vec<Token> {
let mut result: Vec<Token> = vec![];
let mut inside_repeat = false;
let mut cur = String::new();
for character in input.chars() {
if character == '{' && !inside_repeat {
inside_repeat = !inside_repeat;
result.push(
Token::String(cur.clone())
);
cur.clear();
} else if character == '}' {
inside_repeat = !inside_repeat;
let inside_len = cur.chars().collect::<Vec<char>>().len();
if inside_len > 2 {
let ch_start = cur.chars().next().unwrap();
let ch_end = cur.chars().nth(2).unwrap();
result.push(
Token::Repeat(
ch_start as u32,
ch_end as u32,
ch_start as u32
)
);
} else if inside_len == 1 {
result.push(
match cur.chars().next().unwrap() {
'l' => Token::CharSet(char_sets::L_CH.to_owned(), 0),
'u' => Token::CharSet(char_sets::U_CH.to_owned(), 0),
'd' => Token::CharSet(char_sets::D_CH.to_owned(), 0),
's' => Token::CharSet(char_sets::S_CH.to_owned(), 0),
_ => Token::String(String::from(""))
}
)
}
cur.clear();
} else { cur.push(character) };
}
result.push(
Token::String(cur.clone())
);
cur.clear();
// for token in &result{ println!("(debug) tokenized: {}", token) }
result
}
pub struct TokenIter {
pub toks: Vec<Token>,
repeat_len: usize,
done: bool
}
pub fn token_iterator(tokens: &[Token]) -> TokenIter {
TokenIter {
toks: tokens.to_owned(), done: false,
repeat_len: tokens.iter()
.filter(|e| matches!(e, Token::Repeat(_, _, _)) || matches!(e, Token::CharSet(_, _)))
.count()
}
}
impl Iterator for TokenIter {
type Item = String;
fn next(&mut self) -> Option<Self::Item> {
if self.done {
return None;
}
let mut result = String::new();
let mut inc_next = true;
let mut current_tok = 1;
for tok in &mut self.toks {
match tok {
Token::String(s) => result.push_str(s),
Token::Repeat(start, end, cur) => {
result.push(char::from_u32(*cur).unwrap());
if !inc_next { continue }
if cur != end {
inc_next = false;
*cur += 1;
continue
}
*cur = *start;
if current_tok == self.repeat_len {
self.done = true;
return Some(result)
}
current_tok += 1;
},
Token::CharSet(ch_set, cur) => {
result.push(ch_set.chars().nth(*cur).unwrap());
if !inc_next { continue }
if *cur != (ch_set.len() - 1 ) {
inc_next = false;
*cur += 1;
continue;
}
*cur = 0;
if current_tok == self.repeat_len {
self.done = true;
return Some(result)
}
current_tok += 1;
}
}
}
if self.repeat_len == 0 {
self.done = true;
}
Some(result)
}
}
impl TokenIter {
pub fn calculate_total(&self) -> u128 {
let mut result: u128 = 1;
for tok in &self.toks {
if let Token::Repeat(start, end, _) = tok {
result *= (*end as u128) - (*start as u128) + 1
}
if let Token::CharSet(ch_set, _) = tok {
result *= ch_set.len() as u128
}
}
result
}
pub fn calculate_size(&self) -> u128 {
let mut sample_str = String::new();
for tok in &self.toks {
match tok {
Token::String(s) => sample_str.push_str(s),
Token::Repeat(start, _, _) => sample_str.push(char::from_u32(*start).unwrap()),
Token::CharSet(ch_set, _) => sample_str.push(ch_set.chars().next().unwrap())
}
}
sample_str.push('\n'); // written on disk with a new line so we add a new line
sample_str.len() as u128 * self.calculate_total()
}
}