parse-display 0.11.0

use core::num::NonZero;
use std::{ffi::OsString, path::PathBuf};

use crate::ANY_REGEX;

/// A trait for getting regex patterns that match strings parseable by [`FromStr`](core::str::FromStr).
///
/// When using [`#[derive(FromStr)]`](derive@crate::FromStr) with the [`#[from_str(regex_infer)]`](derive@crate::Display#from_strregex_infer) attribute,
/// the regex pattern is obtained from the `FromStrRegex` implementation of the field's type.
pub trait FromStrRegex: core::str::FromStr {
    /// Returns a regex pattern for strings that might be parseable by [`FromStr`](core::str::FromStr).
    ///
    /// Note: Matching this pattern does not guarantee that the string can be parsed successfully.
    fn from_str_regex() -> String;
}

impl FromStrRegex for char {
    fn from_str_regex() -> String {
        r"(?s:.)".into()
    }
}

fn regex_any() -> String {
    ANY_REGEX.into()
}

impl FromStrRegex for String {
    fn from_str_regex() -> String {
        regex_any()
    }
}
impl FromStrRegex for OsString {
    fn from_str_regex() -> String {
        regex_any()
    }
}
impl FromStrRegex for PathBuf {
    fn from_str_regex() -> String {
        regex_any()
    }
}

impl FromStrRegex for bool {
    fn from_str_regex() -> String {
        r"true|false".into()
    }
}

fn regex_uint() -> String {
    r"[0-9]+".into()
}
impl FromStrRegex for u8 {
    fn from_str_regex() -> String {
        regex_uint()
    }
}
impl FromStrRegex for NonZero<u8> {
    fn from_str_regex() -> String {
        regex_uint()
    }
}

impl FromStrRegex for u16 {
    fn from_str_regex() -> String {
        regex_uint()
    }
}
impl FromStrRegex for NonZero<u16> {
    fn from_str_regex() -> String {
        regex_uint()
    }
}

impl FromStrRegex for u32 {
    fn from_str_regex() -> String {
        regex_uint()
    }
}
impl FromStrRegex for NonZero<u32> {
    fn from_str_regex() -> String {
        regex_uint()
    }
}

impl FromStrRegex for u64 {
    fn from_str_regex() -> String {
        regex_uint()
    }
}
impl FromStrRegex for NonZero<u64> {
    fn from_str_regex() -> String {
        regex_uint()
    }
}

impl FromStrRegex for u128 {
    fn from_str_regex() -> String {
        regex_uint()
    }
}
impl FromStrRegex for NonZero<u128> {
    fn from_str_regex() -> String {
        regex_uint()
    }
}

impl FromStrRegex for usize {
    fn from_str_regex() -> String {
        regex_uint()
    }
}
impl FromStrRegex for NonZero<usize> {
    fn from_str_regex() -> String {
        regex_uint()
    }
}

fn regex_sint() -> String {
    r"-?[0-9]+".into()
}

impl FromStrRegex for i8 {
    fn from_str_regex() -> String {
        regex_sint()
    }
}
impl FromStrRegex for NonZero<i8> {
    fn from_str_regex() -> String {
        regex_sint()
    }
}

impl FromStrRegex for i16 {
    fn from_str_regex() -> String {
        regex_sint()
    }
}
impl FromStrRegex for NonZero<i16> {
    fn from_str_regex() -> String {
        regex_sint()
    }
}

impl FromStrRegex for i32 {
    fn from_str_regex() -> String {
        regex_sint()
    }
}
impl FromStrRegex for NonZero<i32> {
    fn from_str_regex() -> String {
        regex_sint()
    }
}

impl FromStrRegex for i64 {
    fn from_str_regex() -> String {
        regex_sint()
    }
}
impl FromStrRegex for NonZero<i64> {
    fn from_str_regex() -> String {
        regex_sint()
    }
}
impl FromStrRegex for i128 {
    fn from_str_regex() -> String {
        regex_sint()
    }
}
impl FromStrRegex for NonZero<i128> {
    fn from_str_regex() -> String {
        regex_sint()
    }
}

impl FromStrRegex for isize {
    fn from_str_regex() -> String {
        regex_sint()
    }
}
impl FromStrRegex for NonZero<isize> {
    fn from_str_regex() -> String {
        regex_sint()
    }
}

fn regex_f() -> String {
    r"(?i:[+-]?([0-9]+\.?|[0-9]*\.[0-9]+)(e[+-]?[0-9]+)?|[+-]?inf|nan)".into()
}
impl FromStrRegex for f32 {
    fn from_str_regex() -> String {
        regex_f()
    }
}
impl FromStrRegex for f64 {
    fn from_str_regex() -> String {
        regex_f()
    }
}