这基本是官方文档的部分翻译和自我理解，主要为了能有个地方放一下，最近也打算迁移Blog 到 Github了。
正在搞Jekyll，iteye现在的人气实在不行咯
YAML Ain't Markup Language(YAML)
语法
Structure 空格 Sequence - Map 键值对对 : 分割
Collections
Example 2.1 Sequence of scalars
- Mark McGwire
- Sammy Sosa
- Ken Griffey
Example 2.2 Mapping of scalars to scalars
hr: 65
avg: 0.278
rbi: 147
Example 2.3 Mapping of scalars to sequences
american:
- Boston Red Sox
- Detroit Tigers
- New York Yankees
national:
- New York Mets
- Chicago Cubs
- Atlanta Braves
Example 2.4 Sequence of mappings
-
name: Mark McGwire
hr: 65
avg: 0.278
-
name: Sammy Sosa
hr: 63
avg: 0.288
Example 2.5 Sequence of sequences
- [name, hr, avg]
- [Mark McGwire, 65, 0.278]
- [Sammy Sosa, 63, 0.299]
Example 2.6 Mapping of mappings
Mark McGwire: {hr: 65, avg: 0.278}
Sammy Sosa: {
hr: 63,
avg: 0.288
}
Structure
在一个档案中，可同时包含多个文件，并用"——"分隔。选择性的符号"..."可以用来表示档案结尾（在利用串流的通讯中，这非常有用，可以在不关闭串流的情况下，发送结束讯号）。
Example 2.7 Tow Documents in a Stream(each with a leading comment)
# Ranking of 1998 home runs
---
- Mark McGwire
- Sammy Sosa
- Ken Griffey
# Team ranking
---
- Chicago Cubs
- St Louis Cardinals
Example 2.8 Play by Play Feed
from a Game
---
time: 20:03:20
player: Sammy Sosa
action: strike (miss)
...
---
time: 20:03:47
player: Sammy Sosa
action: grand slam
...
重复的node可以用锚点&定义，下一次使用*引用
Example 2.9 Single Document with Two Comments
---
hr: # 1998 hr ranking
- Mark McGwire
- Sammy Sosa
rbi:
# 1998 rbi ranking
- Sammy Sosa
- Ken Griffey
Example 2.10 Node for "Sammy Sosa"
appears twice in this document
---
hr:
- Mark McGwire
# Following node labeled SS
- &SS Sammy Sosa
rbi:
- *SS # Subsequent occurrence
- Ken Griffey
? 加上一个空格后面可以带上一个复杂的Mapping Key
Example 2.11. Mapping between Sequences
? - Detroit Tigers
- Chicago cubs
:
- 2001-07-23
? [ New York Yankees,
Atlanta Braves ]
: [ 2001-07-02, 2001-08-12,
2001-08-14 ]
Example 2.12. Compact Nested Mapping
---
# Products purchased
- item : Super Hoop
quantity: 1
- item : Basketball
quantity: 4
- item : Big Shoes
quantity: 1
Scalars 标量
区块字符可以以| 或 > 打头开始，用|打头会保留换行符，用>会以折叠的方式保存，换行符会被保存为空格
Example 2.13 In literals, newlines are preserved
# ASCII Art
--- |
\//||\/||
// || ||__
Example 2.14. In the folded scalars, newlines become spaces
--- >
Mark McGwire's
year was crippled
by a knee injury.
Example 2.15. Folded newlines are preserved for "more indented" and blank lines
>
Sammy Sosa completed another
fine season with great stats.
63 Home Runs
0.288 Batting Average
What a year!
Example 2.16. Indentation determines scope
name: Mark McGwire
accomplishment: >
Mark set a major league
home run record in 1998.
stats: |
65 Home Runs
0.278 Batting Average
YAML的标量包含了加引号的文本和不加引号的文本，目前使用的都是不加引号的文本。双引号文本提供了转义，单引号不提供转义。所有的文本标量都能跨多行；换行符会自动的折叠
Example 2.17. Quoted Scalars
unicode: "Sosadidfine.\u263A"
control: "\b1998\t1999\t2000\n"
hex esc: "\x0d\x0ais\r\n"
single: '"Howdy!"hecried.'
quoted: '#Nota''comment''.'
tie-fighter: '|\-*-/|'
Example 2.18. Multi-line Flow Scalars
plain:
This unquoted scalar
spans many lines.
quoted: "Sodoesthis
quotedscalar.\n"
Tags
YAML中，默认的数据类型根据使用的场景耳钉。通常的类型包含了seq，map和str。还有一些包含int, float, null。另外还有binary, omap, set等等 如果要在YAML中指定数据类型，在数据类型标示前加!。强制类型转换用!!, 另外还能使用自定义类型!
Example 2.23. Various Explicit Tags
---
not-date: !!str 2002-04-28
picture: !!binary |
R0lGODlhDAAMAIQAAP//9/X
17unp5WZmZgAAAOfn515eXv
Pz7Y6OjuDg4J+fn5OTk6enp
56enmleECcgggoBADs=
application specific tag: !something |
The semantics of the tag
above may be different for
different documents.
Example 2.24. Global Tags
%TAG ! tag:clarkevans.com,2002:
--- !shape
# Use the ! handle for presenting
# tag:clarkevans.com,2002:circle
- !circle
center: &ORIGIN {x: 73, y: 129}
radius: 7
- !line
start: *ORIGIN
finish: { x: 89, y: 102 }
- !label
start: *ORIGIN
color: 0xFFEEBB
text: Pretty vector drawing.
Example 2.25. Unordered Sets
# Sets are represented as a
# Mapping where each key is
# associated with a null value
--- !!set
? Mark McGwire
? Sammy Sosa
? Ken Griff
Example 2.26. Ordered Mappings
# Ordered maps are represented as
# A sequence of mappings, with
# each mapping having one key
--- !!omap
- Mark McGwire: 65
- Sammy Sosa: 63
- Ken Griffy: 58
完整的例子
Example 2.27. Invoice
--- !