vcard 0.4.13

A pure Rust implementation of vCard based on RFC 6350.
Documentation 
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use std::{
    fmt::{self, Display, Formatter, Write},
    hash::{Hash, Hasher},
};

use validators::{Validated, ValidatedWrapper};

use super::{
    super::{
        values::{parameter_value::ParameterValues, Value},
        IanaToken, Set, XName,
    },
    Parameter,
};

#[derive(Clone, Debug, Eq)]
pub enum Any {
    IanaToken(IanaToken, ParameterValues),
    XName(XName, ParameterValues),
}

impl Any {
    pub fn is_empty(&self) -> bool {
        match self {
            Any::IanaToken(_, v) => v.is_empty(),
            Any::XName(_, v) => v.is_empty(),
        }
    }
}

impl Parameter for Any {
    fn fmt(&self, f: &mut Formatter) -> Result<(), fmt::Error> {
        if self.is_empty() {
            return Ok(());
        }

        f.write_char(';')?;

        let set = match self {
            Any::IanaToken(a, b) => {
                f.write_str(a.as_str())?;
                b
            },
            Any::XName(a, b) => {
                f.write_str(a.as_str())?;
                b
            },
        };

        f.write_char('=')?;

        Value::fmt(set, f)?;

        Ok(())
    }
}

impl Parameter for Set<Any> {
    fn fmt(&self, f: &mut Formatter) -> Result<(), fmt::Error> {
        for e in self.as_hash_set() {
            Parameter::fmt(e, f)?;
        }

        Ok(())
    }
}

impl Value for Any {
    fn fmt(&self, f: &mut Formatter) -> Result<(), fmt::Error> {
        Parameter::fmt(self, f)
    }
}

impl Display for Any {
    fn fmt(&self, f: &mut Formatter) -> Result<(), fmt::Error> {
        Parameter::fmt(self, f)
    }
}

impl PartialEq for Any {
    #[inline]
    fn eq(&self, other: &Any) -> bool {
        match self {
            Any::IanaToken(a, b) => match other {
                Any::IanaToken(aa, bb) => a == aa && b == bb,
                _ => false,
            },
            Any::XName(a, b) => match other {
                Any::XName(aa, bb) => a == aa && b == bb,
                _ => false,
            },
        }
    }
}

impl Hash for Any {
    fn hash<H: Hasher>(&self, state: &mut H) {
        match self {
            Any::XName(a, b) => {
                state.write(a.as_str().as_bytes());
                b.hash(state);
            },
            Any::IanaToken(a, b) => {
                state.write(a.as_str().as_bytes());
                b.hash(state);
            },
        }
    }
}

impl Validated for Any {}

impl ValidatedWrapper for Any {
    type Error = &'static str;

    fn from_string(_from_string_input: String) -> Result<Self, Self::Error> {
        unimplemented!();
    }

    fn from_str(_from_str_input: &str) -> Result<Self, Self::Error> {
        unimplemented!();
    }
}