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格式

基本格式

yaml中允许表示三种格式，分别为常量值、对象和数组
大小写敏感
使用缩进代表层级关系
.缩进只能使用空格，不能使用tab键，不要求空格个数，只需要相同层级左对齐（一般2或4个空格）

类型

可以使用!!来定义类型

map

key唯一

Block style: !!map
  Clark : Evans
  Ingy  : döt Net
  Oren  : Ben-Kiki

Flow style: !!map { Clark: Evans, Ingy: döt Net, Oren: Ben-Kiki }

omap

键: 值对的有序序列，无重复值。

# Explicitly typed ordered map (dictionary).
Bestiary: !!omap
  - aardvark: African pig-like ant eater. Ugly.
  - anteater: South-American ant eater. Two species.
  - anaconda: South-American constrictor snake. Scaly.
  # Etc.
# Flow style
Numbers: !!omap [ one: 1, two: 2, three : 3 ]

pairs

键: 值对的有序序列，允许重复。

# Explicitly typed pairs.
Block tasks: !!pairs
  - meeting: with team.
  - meeting: with boss.
  - break: lunch.
  - meeting: with client.
Flow tasks: !!pairs [ meeting: with team, meeting: with boss ]

set

非等值的无序集合。

# Explicitly typed set.
baseball players: !!set
  ? Mark McGwire
  ? Sammy Sosa
  ? Ken Griffey
# Flow style
baseball teams: !!set { Boston Red Sox, Detroit Tigers, New York Yankees }

seq

表示一个从零开始的连续整数索引的集合。

Block style: !!seq
- Clark Evans
- Ingy döt Net
- Oren Ben-Kiki

Flow style: !!seq [ Clark Evans, Ingy döt Net, Oren Ben-Kiki ]

str

表示 Unicode 字符串,由零个或多个 Unicode 字符组成的序列。

Block style: !!str |-
  String: just a theory.

Flow style: !!str "String: just a theory."

null

表示缺少值。
null | Null | NULL | ~

!!null null: value for null key
key with null value: !!null null

bool
表示一个 true/false 值
true | True | TRUE | false | False | FALSE
```
YAML is a superset of JSON: !!bool true
Pluto is a planet: !!bool false
```

int

整数

negative: !!int -12
zero: !!int 0
positive: !!int 34

float

表示实数的近似值，包括三个特殊值(正无穷大和负无穷大，以及“非数”)。

negative: !!float -1
zero: !!float 0
positive: !!float 2.3e4
infinity: !!float .inf
not a number: !!float .nan

binary

一个由零个或多个八位元组成的序列(8位值)。

canonical: !!binary "\
 R0lGODlhDAAMAIQAAP//9/X17unp5WZmZgAAAOfn515eXvPz7Y6OjuDg4J+fn5\
 OTk6enp56enmlpaWNjY6Ojo4SEhP/++f/++f/++f/++f/++f/++f/++f/++f/+\
 +f/++f/++f/++f/++f/++SH+Dk1hZGUgd2l0aCBHSU1QACwAAAAADAAMAAAFLC\
 AgjoEwnuNAFOhpEMTRiggcz4BNJHrv/zCFcLiwMWYNG84BwwEeECcgggoBADs="
generic: !binary |
 R0lGODlhDAAMAIQAAP//9/X17unp5WZmZgAAAOfn515eXvPz7Y6OjuDg4J+fn5
 OTk6enp56enmlpaWNjY6Ojo4SEhP/++f/++f/++f/++f/++f/++f/++f/++f/+
 +f/++f/++f/++f/++f/++SH+Dk1hZGUgd2l0aCBHSU1QACwAAAAADAAMAAAFLC
 AgjoEwnuNAFOhpEMTRiggcz4BNJHrv/zCFcLiwMWYNG84BwwEeECcgggoBADs=
description:
 The binary value above is a tiny arrow encoded as a gif image.

merge

指定一个或多个要与当前映射合并的映射。

---
- &CENTER { x: 1, y: 2 }
- &LEFT { x: 0, y: 2 }
- &BIG { r: 10 }
- &SMALL { r: 1 }

# All the following maps are equal:

- # Explicit keys
  x: 1
  y: 2
  r: 10
  label: center/big

- # Merge one map
  << : *CENTER
  r: 10
  label: center/big

- # Merge multiple maps
  << : [ *CENTER, *BIG ]
  label: center/big

- # Override
  << : [ *BIG, *LEFT, *SMALL ]
  x: 1
  label: center/big

timestamp

时间

 匹配:
 [0-9][0-9][0-9][0-9]-[0-9][0-9]-[0-9][0-9] # (ymd)
|[0-9][0-9][0-9][0-9] # (year)
 -[0-9][0-9]? # (month)
 -[0-9][0-9]? # (day)
 ([Tt]|[ \t]+)[0-9][0-9]? # (hour)
 :[0-9][0-9] # (minute)
 :[0-9][0-9] # (second)
 (\.[0-9]*)? # (fraction)
 (([ \t]*)Z|[-+][0-9][0-9]?(:[0-9][0-9])?)? # (time zone)
 
 
 
canonical:        2001-12-15T02:59:43.1Z
valid iso8601:    2001-12-14t21:59:43.10-05:00
space separated:  2001-12-14 21:59:43.10 -5
no time zone (Z): 2001-12-15 2:59:43.10
date (00:00:00Z): 2002-12-14

格式 ​

基本格式 ​

类型 ​

格式

基本格式

类型