perspective 2.0.0

A data visualization and analytics component, especially well-suited for large and/or streaming datasets.
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////////////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2018, the Perspective Authors.
//
// This file is part of the Perspective library, distributed under the terms
// of the Apache License 2.0.  The full license can be found in the LICENSE
// file.

use std::fmt::Display;

use serde::{Deserialize, Serialize};

#[derive(Clone, Deserialize, Debug, Eq, PartialEq, Serialize)]
#[serde()]
pub struct Sort(pub String, pub SortDir);

#[derive(Clone, Copy, Deserialize, Debug, Eq, PartialEq, Serialize)]
#[serde()]
pub enum SortDir {
    #[serde(rename = "none")]
    None,

    #[serde(rename = "desc")]
    Desc,

    #[serde(rename = "asc")]
    Asc,

    #[serde(rename = "col desc")]
    ColDesc,

    #[serde(rename = "col asc")]
    ColAsc,

    #[serde(rename = "desc abs")]
    DescAbs,

    #[serde(rename = "asc abs")]
    AscAbs,

    #[serde(rename = "col desc abs")]
    ColDescAbs,

    #[serde(rename = "col asc abs")]
    ColAscAbs,
}

impl Display for SortDir {
    fn fmt(&self, fmt: &mut std::fmt::Formatter<'_>) -> std::result::Result<(), std::fmt::Error> {
        write!(fmt, "{}", match self {
            Self::None => "none",
            Self::Desc => "desc",
            Self::Asc => "asc",
            Self::ColDesc => "col desc",
            Self::ColAsc => "col asc",
            Self::DescAbs => "desc abs",
            Self::AscAbs => "asc abs",
            Self::ColDescAbs => "col desc abs",
            Self::ColAscAbs => "col asc abs",
        })
    }
}

impl SortDir {
    /// Increment the `SortDir` in logical order, given an `abs()` modifier.
    pub fn cycle(&self, split_by: bool, abs: bool) -> Self {
        let order: &[Self] = match (split_by, abs) {
            (false, false) => &[Self::None, Self::Asc, Self::Desc],
            (false, true) => &[Self::None, Self::AscAbs, Self::DescAbs],
            (true, false) => &[
                Self::None,
                Self::Asc,
                Self::Desc,
                Self::ColAsc,
                Self::ColDesc,
            ],
            (true, true) => &[
                Self::None,
                Self::AscAbs,
                Self::DescAbs,
                Self::ColAscAbs,
                Self::ColDescAbs,
            ],
        };

        let index = order.iter().position(|x| x == self).unwrap_or(0);
        order[(index + 1) % order.len()]
    }
}