wkt 0.5.0

Rust read/write support for well-known text (WKT)
Documentation 
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// Copyright 2014-2015 The GeoRust Developers
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//	http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

use std::fmt;
use tokenizer::{PeekableTokens, Token};
use FromTokens;

#[derive(Default)]
pub struct Coord {
    pub x: f64,
    pub y: f64,
    pub z: Option<f64>,
    pub m: Option<f64>,
}

impl fmt::Display for Coord {
    fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
        write!(f, "{} {}", self.x, self.y)?;
        if let Some(z) = self.z {
            write!(f, " {}", z)?;
        }
        if let Some(m) = self.m {
            write!(f, " {}", m)?;
        }
        Ok(())
    }
}

impl FromTokens for Coord {
    fn from_tokens(tokens: &mut PeekableTokens) -> Result<Self, &'static str> {
        let x = match tokens.next() {
            Some(Token::Number(n)) => n,
            _ => return Err("Expected a number for the X coordinate"),
        };
        let y = match tokens.next() {
            Some(Token::Number(n)) => n,
            _ => return Err("Expected a number for the Y coordinate"),
        };
        Ok(Coord {
            x: x,
            y: y,
            z: None,
            m: None,
        })
    }
}

#[cfg(test)]
mod tests {
    use super::Coord;

    #[test]
    fn write_2d_coord() {
        let coord = Coord {
            x: 10.1,
            y: 20.2,
            z: None,
            m: None,
        };

        assert_eq!("10.1 20.2", format!("{}", coord));
    }

    #[test]
    fn write_3d_coord() {
        let coord = Coord {
            x: 10.1,
            y: 20.2,
            z: Some(-30.3),
            m: None,
        };

        assert_eq!("10.1 20.2 -30.3", format!("{}", coord));
    }

    #[test]
    fn write_2d_coord_with_linear_referencing_system() {
        let coord = Coord {
            x: 10.1,
            y: 20.2,
            z: None,
            m: Some(10.),
        };

        assert_eq!("10.1 20.2 10", format!("{}", coord));
    }

    #[test]
    fn write_3d_coord_with_linear_referencing_system() {
        let coord = Coord {
            x: 10.1,
            y: 20.2,
            z: Some(-30.3),
            m: Some(10.),
        };

        assert_eq!("10.1 20.2 -30.3 10", format!("{}", coord));
    }
}