YAML

YAML (데이터 직렬화)

XML, JSON 과 같은 데이터 직렬화 방식
최대한 간결하게 파이프라인을 구성하도록 되어있음

Tag

tag를 통해 데이터 구조를 명확히 지칭
일부 seq, map, object map, set 은 암시적인 tag로 적용됨

map:
  Block style: !!map
    Clark : Evans
    Oren  : Ben-Kiki

데이터 구조 (Collection Types)

seq, array (!!seq)

  Block style:
    - one
    - two
    - three
  Flow style: [one, two, three]

map (!!map)

map:
  # Unordered set of key: value pairs.
  Block style:
    Clark : Evans
    Ingy  : döt Net
    Oren  : Ben-Kiki
  Flow style: { Clark: Evans, Ingy: döt Net, Oren: Ben-Kiki }

object map (!!omap)

objectMap:
  Block style:
    - one: 1
    - two: 2
    - three : 3
  Flow style: [ one: 1, two: 2, three : 3 ]

set (!!set)

set:
  Block tasks:
    ? Mark McGwire
    ? Sammy Sosa
    ? Ken Griffey
  # Flow style
  Flow style: { Boston Red Sox, Detroit Tigers, New York Yankees }

pair (tag need / !!pairs)

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

데이터 타입 (Scalar Types)

#========================================== string
string: abcd
swap string every line: |
  a
  long
  string
swap string last line: >
  a
  long
  string
#========================================== bool
bool:
  - true
  - True
  - TRUE
  - false
  - False
  - FALSE
#========================================== float
float:
  canonical: 6.8523015e+5
  exponentioal: 685.230_15e+03
  fixed: 685_230.15
  negative infinity: -.inf
  not a number: .NaN
#========================================== int
int:
  canonical: 685230
  decimal: +685_230
  octal: 0o2472256
  hexadecimal: 0x_0A_74_AE
  binary: 0b1010_0111_0100_1010_1110
#========================================== null
null:
  # This mapping has four keys,
  # one has a value.
  empty:
  canonical: ~
  english: null
  ~: null key
  # This sequence has five
  # entries, two have values.
  sparse:
    - ~
    - 2nd entry
    -
    - 4th entry
    - Null
#========================================== timestamp
timestamp:
  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

데이터 구조 병합 (Merge)

override 시, 먼저 참조한 데이터의 값을 먼저 사용

#============================================== object
object:
  foo: &foo
    a: 1
    b: 2
  bar:
    <<: *foo
    c: 3
  marge object a: &moa
    a: 1
    b: 2
  marge object b: &mob
    a: 3
    c: 4
  marge all:
    <<: [*moa, *mob]
  marge all with data:
    <<: [*moa, *mob]
    new data: new
#============================================== list
list:
  - &CENTER { x: 1, y: 2 }
  - &LEFT { x: 0, y: 2 }
  - &BIG { r: 10 }
  - &SMALL { r: 1 }

  - # Explicit keys
    x: 1
    y: 2
    r: 10
    label: nothing

  - << : *CENTER
    r: 10
    label: center

  - << : [ *CENTER, *BIG ]
    label: center/big

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

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