color-convert 0.1.0

Support RGB,RGBA,HEX,HSL,HSLA,HSV,CMYK to convert each other, write by rust.
Documentation 
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// use std::ascii::AsciiExt;
//use config::ColorMode;
use color::{Color, Error};
use handles::map;
use handles::hex;

// Get hex's transparency value and convert to decimal
// ['8','0','f','f','f','f','f','f'] to_android = true -> 0.5
// ['f','f','f','f','f','f','8','0'] to_android = false -> 0.5
pub fn get_hex_alpha_value(color: &Color) -> f32 {
	let hex_vec = hex::handle_hex_value( &color).unwrap();
	let value: &[&str] = &hex_vec[&hex_vec.len() - 2..];

	let a: usize = map::map_hex(&*value[1].to_uppercase());
	let b: usize = map::map_hex(&*value[0].to_uppercase());

	((a + b * 16) as f32 / 255.0 * 10000.0).round() / 10000.0
}

// Get rgba transparency value and convert to hexadecimal
// "rgba(1,1,1,.5)" -> 0.5
pub fn get_rgba_alpha_value(color: &str) -> Result<f32, Error> {
	let vec_value: Vec<&str> = color.split(',').collect();

	let result = match vec_value.len() {
		3 => 1f32,
		4 => {
			let alpha: String = vec_value[3].replace(")", "");
			match alpha.parse::<f32>() {
				Ok(value) => value,
				Err(_error) => return Err(Error::RgbAlphaFormat),
			}
		},
		_ => return Err(Error::RgbAlphaFormat)
	};

	Ok(result)
}

// transparency value convert to hexadecimal
// 0.5 -> "80"
pub fn handel_alpha_to_hexadecimal(alpha: f32) -> String {
	if alpha == 1f32 || alpha > 1f32 {
		return String::from("FF");
	}

	let to_decimal = alpha * 256f32;
	let b = (to_decimal % 16f32) as usize;
	let a = (to_decimal / 16f32 % 16f32) as usize;

	// let value: &'a str = &*format!("{}{}", map::map_rgb(a), map::map_rgb(b));
	map::map_rgb(&a).to_owned() + map::map_rgb(&b)
}

// convert value_string to number
// "50%" -> 0.5; "0.5" -> 0.5; ".5" -> 0.5, "244" -> 0.094
pub fn convert_rgb_value_to_number(value: &str) ->f32 {
	let result;
	if value.contains("%") {
		let n = value.replace("%", "");
		result = match n.parse::<f32>() {
			Ok(value) => value / 100f32,
			Err(_error) => 0f32,
		};
	} else {
		result = match value.parse::<f32>() {
			Ok(value) => value / 255f32,
			Err(_error) => 0f32,
		};
	}

	result
}

// convert value_string to number
// "50%" -> 0.5; "0.5" -> 0.5; ".5" -> 0.5
pub fn convert_alpha_value_to_number(value: &str) ->f32 {
	let result;
	if value.contains("%") {
		let n = value.replace("%", "");
		result = match n.parse::<f32>() {
			Ok(value) => value / 100f32,
			Err(_error) => 0f32,
		};
	} else {
		result = match value.parse::<f32>() {
			Ok(value) => value,
			Err(_error) => 0f32,
		};
	}

	result
}

// convert f32 value to include % value
// 0.3 -> "30%"; 1 -> "100%"; 0.452444 -> "45.24%"; 0.000 -> "0"; 101.34 -> "101.34"
pub fn convert_f32_to_percent(v: f32) -> String {
	if v == 0f32 {
		String::from("0")
	} else if v > 100f32 {
		format!("{:.2}", v)
	} else {
		let value = v * 100f32;
		let mut s = value.to_string();

		s.truncate(5);
		s.push('%');
		s
	}
}

// convert 0f32 to "0"
// 0.000 -> "0"; 2.535 -> "2.535"
pub fn convert_f32_to_string(v: f32) -> String {
	if v == 0f32 {
		String::from("0")
	} else {
		format!("{:.2}", v)
	}
}

// setting accuracy
pub fn round(value: f32, digit: u32) -> f32 {
	let a = 10usize.pow(digit) as f32;

	(value * a).round() / a
}

// convert decimal to percent
pub fn decimal_to_percent(value: f32) -> String {
	if value < 1f32 {
		format!("{}%", round(value, 2) * 100f32)
	} else {
		format!("{}", round(value, 2))
	}
}