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//! # arg_parser
//!
//! Module about argument parsing
use std::{iter::Peekable, str::Chars};
use crate::consts::{ESCAPE_CHAR, LIT_CHAR};
pub(crate) struct ArgParser{
values :Vec<String>,
previous : Option<char>,
lit_count : usize,
no_previous : bool,
}
/// State indicates whether argument should be parsed greedily or not
#[derive(Debug)]
pub(crate) enum GreedyState {
Reserve(usize),
None,
Never,
}
impl ArgParser {
pub(crate) fn new() -> Self {
Self {
values :vec![],
previous : None,
lit_count : 0,
no_previous : false,
}
}
/// Check if given length is qualified for given raw arguments
///
/// If length is qualified it returns vector of arguments
/// if not, "None" is returned instead.
pub(crate) fn args_with_len<'a>(&mut self, args: &'a str, length: usize, greedy: bool) -> Option<Vec<String>> {
let greedy_state = if greedy {
if length > 1 {
GreedyState::Reserve(length - 1)
} else {
GreedyState::None
}
} else {
GreedyState::Never
};
let args: Vec<_> = self.args_to_vec(args, ',', greedy_state);
if args.len() < length {
return None;
}
Some(args)
}
/// Split raw arguments into a vector
pub(crate) fn args_to_vec(&mut self, arg_values: &str, delimiter: char, mut greedy_state: GreedyState) -> Vec<String> {
let mut value = String::new();
let mut arg_iter = arg_values.chars().peekable();
while let Some(ch) = arg_iter.next() {
if ch == delimiter {
self.branch_delimiter(ch, &mut value, &mut greedy_state);
}
// Default behaviour of escape_char is not adding
else if ch == ESCAPE_CHAR {
self.branch_escape_char(ch, &mut value);
}
else { // This pushes value in the end, so use continue not push the value
if ch == LIT_CHAR { // '*'
self.branch_literal_char(ch, &mut value, &mut arg_iter);
} else { // Non literal character are just pushed
value.push(ch);
}
}
if self.no_previous {
self.previous.replace('0');
self.no_previous = false;
} else {
self.previous.replace(ch);
}
} // while end
// Add last arg
self.values.push(value);
std::mem::replace(&mut self.values, vec![])
}
// ----------
// <BRANCH>
// Start of branch methods
fn branch_delimiter(&mut self, ch: char,value: &mut String, greedy_state: &mut GreedyState) {
// Either literal or escaped
if self.lit_count > 0 || self.previous.unwrap_or('0') == ESCAPE_CHAR
{
value.push(ch);
} else { // not literal
match greedy_state {
GreedyState::Reserve(count) => {
// move to next value
self.values.push(std::mem::replace(value, String::new()));
let count = *count - 1;
if count > 0 {
*greedy_state = GreedyState::Reserve(count);
} else {
*greedy_state = GreedyState::None;
}
self.no_previous = true;
}
// Push everything to current item, index, value or you name it
GreedyState::None => {
value.push(ch);
// TODO check this line if this is neceesary
// continue; = self.no_previous = true;
}
GreedyState::Never => {
// move to next value
self.values.push(std::mem::replace(value, String::new()));
}
} // Match end
} // else end
}
fn branch_escape_char(&mut self, ch: char, value: &mut String) {
// If literal print everything without escaping
if self.lit_count > 0 {
value.push(ch);
}
// Previous was escape, then add
else if self.previous.unwrap_or('0') == ESCAPE_CHAR {
value.push(ch);
// Current escape is consumed and doesn't affect next character
self.no_previous = true;
}
} // end function
fn branch_literal_char(&mut self, ch: char, value: &mut String ,arg_iter: &mut Peekable<Chars>) {
if self.previous.unwrap_or('0') == ESCAPE_CHAR {
self.lit_count = self.lit_count + 1;
// If lit character was given inside literal
// e.g. \* '\*' *\ -> the one inside quotes
if self.lit_count > 1 {
value.push(ch);
}
// First lit character in given args
// Simply ignore character and don't set previous
else {
self.no_previous = true;
}
} else if let Some(&ch_next) = arg_iter.peek() {
// Next is escape char and not inside lit_count
// *\
if ch_next == ESCAPE_CHAR && self.lit_count >= 1 {
self.lit_count = self.lit_count - 1;
arg_iter.next(); // Conume next escape_char
// Lit end was outter most one
if self.lit_count == 0 {
self.no_previous = true;
}
// Inside other literal rules
else {
value.push(LIT_CHAR);
value.push(ESCAPE_CHAR);
self.no_previous = true;
}
}
// When *\ Comes first without matching pair
// This is just a string without any meaning
else {
value.push(ch);
}
}
// Meaningless literal charcter are just pushed
else {
value.push(ch);
}
} // end function
// End of branch methods
// </BRANCH>
// ----------
}