letter-sequence

Letter-Sequence 是一个包，它允许你创建比简单的序数数字更复杂的序列。

功能

• 渲染绑定 - 通过渲染输出限制序列
• 以大写字母、小写字母或数字渲染序列
• 使用 += 和 -= 与另一个序列进行序列变异

一个不受渲染输出限制的大写字母序列

use letter_sequence::SequenceBuilder;
use std::convert::TryFrom;

let mut seq = SequenceBuilder::try_from("A")
	.unwrap()
	.upper()
	.build()
	.unwrap();
let elem = seq.next().unwrap();
assert_eq!( elem.to_string(), "A" );
let elem = seq.next().unwrap();
assert_eq!( elem.to_string(), "B" );
seq.set(25).unwrap();
let elem = seq.next().unwrap();
assert_eq!( elem.to_string(), "Z" );
let elem = seq.nth(3).unwrap();
assert_eq!( elem.to_string(), "AD" );
let elem = seq.next().unwrap();
assert_eq!( elem.to_string(), "AE" );

这次设置了 .max_render_capacity()，并设置为 .lower() 案

use letter_sequence::SequenceBuilder;
use std::convert::TryFrom;

let mut seq = SequenceBuilder::try_from("y")
	.unwrap()
	.lower()
	.max_render_capacity(1)
	.build()
	.unwrap();
let elem = seq.next().unwrap();
assert_eq!( elem.to_string(), "y"  );
let elem = seq.next().unwrap();
assert_eq!( elem.to_string(), "z"  );
let elem = seq.next();
assert_eq!( elem, None );

也支持有界和无界的数字序列

use letter_sequence::SequenceBuilder;
use std::convert::From;

let mut seq = SequenceBuilder::from(99)
	.numeric()
	.max_render_capacity(3)
	.build()
	.unwrap();
let elem = seq.next().unwrap();
assert_eq!( elem.to_string(), "99" );
let elem = seq.next().unwrap();
assert_eq!( elem.to_string(), "100" );