235 lines
6.3 KiB
Rust
235 lines
6.3 KiB
Rust
use std::{
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convert::Infallible,
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num::{ParseFloatError, ParseIntError},
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str::{FromStr, ParseBoolError},
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string::FromUtf8Error,
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};
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use log::error;
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use thiserror::Error;
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use self::either::Either;
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use super::hex::HexError;
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pub mod either;
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mod traits;
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pub use traits::*;
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#[derive(Debug, Clone, Error, strum::EnumIs)]
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pub enum ParseError {
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#[error("no more items left in parser")]
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Empty,
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#[error("missing expected value")]
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ValueMissing,
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#[error("invalid command: [{0}]")]
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InvalidCommand(String),
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#[error("invalid value [{value}], expected [{expected}]")]
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InvalidValue {
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value: String,
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expected: &'static str,
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},
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#[error("hex decoding error: [{0}]")]
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HexError(#[from] HexError),
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#[error("primitive type parsing error: [{0}]")]
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PrimitiveError(String),
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}
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impl From<Infallible> for ParseError {
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fn from(_: Infallible) -> Self {
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// nonsense
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unreachable!()
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}
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}
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macro_rules! from_primitive {
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($($err:ty,)*) => {
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$(
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impl From<$err> for ParseError {
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fn from(value: $err) -> Self {
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ParseError::PrimitiveError(value.to_string())
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}
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}
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)*
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};
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}
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from_primitive!(
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ParseBoolError,
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ParseIntError,
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FromUtf8Error,
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ParseFloatError,
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);
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impl From<strum::ParseError> for ParseError {
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fn from(value: strum::ParseError) -> Self {
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ParseError::InvalidCommand(value.to_string())
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}
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}
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pub struct ArgParser<I, T>
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where
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I: Iterator<Item = T>,
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{
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inner: I,
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}
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impl<I, T> Clone for ArgParser<I, T>
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where
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I: Iterator<Item = T> + Clone,
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{
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fn clone(&self) -> Self {
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Self {
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inner: self.inner.clone(),
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}
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}
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}
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impl<I> ArgParser<I, String>
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where
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I: Iterator<Item = String>,
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{
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pub fn from_strings(src: I) -> Self {
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Self { inner: src }
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}
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#[inline(always)]
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pub fn next_string(&mut self) -> Option<String> {
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self.inner.next()
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}
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#[inline(always)]
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pub fn inner(self) -> I {
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self.inner
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}
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/// Gets the next string, then tries the `try_this` function on it.
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/// If that function returns [Err], it runs the `then_this` function
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/// and returns that result.
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pub fn try_first<F1, F2, T1, T2, E>(
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&mut self,
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try_this: F1,
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then_this: F2,
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on_error: &str,
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) -> Result<Either<T1, T2>, ParseError>
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where
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F1: FnOnce(&String) -> Result<T1, E>,
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F2: FnOnce(&String) -> Result<T2, E>,
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E: Into<ParseError>,
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{
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let next = self.must_string(on_error)?;
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if let Ok(t1) = try_this(&next) {
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return Ok(Either::Left(t1));
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}
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match then_this(&next) {
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Ok(t2) => Ok(Either::Right(t2)),
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Err(err) => {
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let err = err.into();
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error!("{on_error}: {err}");
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Err(err)
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}
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}
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}
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/// Get the next string, or [ParseError::Empty]
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#[inline(always)]
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pub fn must_string(&mut self, on_error: &str) -> Result<String, ParseError> {
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self.inner
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.next()
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.ok_or(ParseError::Empty)
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.inspect_err(|err| error!("{on_error}: {err}"))
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}
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pub fn next_from_str<E: Into<ParseError>, T: FromStr<Err = E>>(
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&mut self,
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on_error: &str,
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) -> Result<T, ParseError> {
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Ok(self.must_string(on_error)?.parse().map_err(|err: E| {
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let err = err.into();
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error!("{on_error}: {err}");
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err
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})?)
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}
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/// Consumes the remainder of the iterator and uses the [FromCommandArgs]
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/// trait to parse it into the desired type
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pub fn collect_command<C: FromCommandArgs>(mut self, on_error: &str) -> Result<C, ParseError> {
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C::from_command_args(&self.must_string(on_error)?, self.inner)
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}
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/// Consumes the remainder of the iterator and uses the [FromStrings]
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/// trait to parse it into the desired type
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pub fn collect_from_strings<T: FromStrings>(self, on_error: &str) -> Result<T, ParseError> {
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T::from_strings(self.inner).inspect_err(|err| {
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error!("{on_error}: {err}");
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})
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}
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/// Consumes the remainder of the iterator and uses the [FromStringsHint]
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/// trait to parse it into the desired type.
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///
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/// Takes a `hint` that may aid in the parsing of that string
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pub fn collect_from_strings_hint<H, T: FromStringsHint<H>>(
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self,
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hint: H,
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on_error: &str,
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) -> Result<T, ParseError> {
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T::from_strings_hint(self.inner, hint).inspect_err(|err| {
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error!("{on_error}: {err}");
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})
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}
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#[inline(always)]
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pub fn collect<B: FromIterator<String>>(self) -> B {
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self.inner.collect()
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}
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/// Get the next [String] from the iterator and tries to parse it with [FromStr]
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/// if there's any remaining items. Otherwise just returns [None]
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pub fn optional_next_from_str<E: Into<ParseError>, T: FromStr<Err = E>>(
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&mut self,
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on_error: &str,
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) -> Result<Option<T>, ParseError> {
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match self.next_string() {
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Some(next) => Ok(Some(next.parse().map_err(|err: E| {
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let err = err.into();
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error!("{on_error}: {err}");
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err
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})?)),
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None => Ok(None),
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}
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}
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/// Consumes the iterator and takes every remaining element, parses them with
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/// [FromStr] and returns them in a [Vec]
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pub fn collect_from_str<E: Into<ParseError>, T: FromStr<Err = E>>(
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self,
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on_error: &str,
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) -> Result<Vec<T>, ParseError> {
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self.inner
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.map(|item| T::from_str(&item))
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.collect::<Result<Vec<_>, _>>()
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.map_err(|err| {
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let err = err.into();
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error!("{on_error}: {err}");
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err
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})
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}
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/// Consumes the iterator and takes every remaining element, checks if any match
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/// `flag`, and returns the strings in the iterator that don't match `flag`,
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/// as well as a boolean on whether `flag` was found.
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pub fn collect_strings_with_flag(self, flag: &str) -> (Vec<String>, bool) {
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let mut out = Vec::new();
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let mut found = false;
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for item in self.inner {
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if item == flag {
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found = true;
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continue;
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}
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out.push(item);
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}
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(out, found)
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}
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}
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