langtag 1.1.0

Language tags implementation following RFC 5646
Documentation 
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use langtag::LangTag;
use std::convert::TryInto;

#[test]
pub fn extensions_eq() {
	let tag = LangTag::new("fr-a-ext1-ext2-b-ext3-ext4-c-ext5-ext6").unwrap();
	assert!(tag.is_normal());
	assert_eq!(tag.extensions(), "a-ext1-ext2-b-ext3-ext4-c-ext5-ext6");
}

#[test]
pub fn extensions_iter() {
	let tag = LangTag::new("fr-a-ext1-ext2-b-ext3-ext4-c-ext5-ext6").unwrap();
	let mut it = tag.extensions().iter();
	assert_eq!(it.next().unwrap(), "a-ext1-ext2");
	assert_eq!(it.next().unwrap(), "b-ext3-ext4");
	assert_eq!(it.next().unwrap(), "c-ext5-ext6");
	assert_eq!(it.next(), None);
}

#[test]
pub fn extensions_iter_extension() {
	let tag = LangTag::new("fr-a-ext1-ext2-b-ext3").unwrap();
	let mut it = tag.extensions().iter_extension('a'.try_into().unwrap());
	assert_eq!(it.next().unwrap(), "ext1");
	assert_eq!(it.next().unwrap(), "ext2");
	let mut it = tag.extensions().iter_extension('b'.try_into().unwrap());
	assert_eq!(it.next().unwrap(), "ext3");
	assert_eq!(it.next(), None);
}

// #[test]
// pub fn extensions_mut_insert() {
// 	let mut tag = LangTag::new("fr-a-ext1-b-ext2").unwrap();
// 	tag.extensions_mut()
// 		.insert('a'.try_into().unwrap(), "ext3".try_into().unwrap());
// 	tag.extensions_mut()
// 		.insert('c'.try_into().unwrap(), "ext4".try_into().unwrap());
// 	tag.extensions_mut()
// 		.insert('b'.try_into().unwrap(), "ext5".try_into().unwrap());
// 	tag.extensions_mut()
// 		.insert('c'.try_into().unwrap(), "ext6".try_into().unwrap());
// 	assert_eq!(tag, "fr-a-ext1-ext3-b-ext2-ext5-c-ext4-ext6")
// }

// #[test]
// pub fn extensions_mut_remove() {
// 	let mut tag =
// 		LangTag::new("fr-a-ext1-ext2-b-ext3-ext4-a-ext5-a-ext6-c-ext7-a-ext8")
// 			.unwrap();
// 	tag.extensions_mut().remove('a'.try_into().unwrap());
// 	assert_eq!(tag, "fr-b-ext3-ext4-c-ext7")
// }

// #[test]
// pub fn extensions_mut_remove_subtag() {
// 	let mut tag =
// 		LangTag::new("fr-a-ext1-ext2-b-ext3-ext4-a-ext5-a-ext6-c-ext7-a-ext8-ext9")
// 			.unwrap();
// 	let a: langtag::Singleton = 'a'.try_into().unwrap();
// 	let b: langtag::Singleton = 'b'.try_into().unwrap();
// 	let c: langtag::Singleton = 'c'.try_into().unwrap();
// 	tag.extensions_mut().remove_subtag(a, "ext1");
// 	assert_eq!(
// 		tag,
// 		"fr-a-ext2-b-ext3-ext4-a-ext5-a-ext6-c-ext7-a-ext8-ext9"
// 	);
// 	tag.extensions_mut().remove_subtag(a, "ext2");
// 	assert_eq!(tag, "fr-b-ext3-ext4-a-ext5-a-ext6-c-ext7-a-ext8-ext9");
// 	tag.extensions_mut().remove_subtag(a, "ext8");
// 	assert_eq!(tag, "fr-b-ext3-ext4-a-ext5-a-ext6-c-ext7-a-ext9");
// 	tag.extensions_mut().remove_subtag(a, "ext9");
// 	assert_eq!(tag, "fr-b-ext3-ext4-a-ext5-a-ext6-c-ext7");
// 	tag.extensions_mut().remove_subtag(a, "ext5");
// 	assert_eq!(tag, "fr-b-ext3-ext4-a-ext6-c-ext7");
// 	tag.extensions_mut().remove_subtag(a, "ext6");
// 	assert_eq!(tag, "fr-b-ext3-ext4-c-ext7");

// 	tag.extensions_mut().remove_subtag(c, "ext7");
// 	assert_eq!(tag, "fr-b-ext3-ext4");
// 	tag.extensions_mut().remove_subtag(b, "ext3");
// 	assert_eq!(tag, "fr-b-ext4");
// 	tag.extensions_mut().remove_subtag(b, "ext4");
// 	assert_eq!(tag, "fr");
// }