Locate keywords

Locate keywords run first. They select the value the rest of the pipeline works on.

source

Core. Reads from the current source scope, and scopes descendant descriptors to what it read.

/name: { source: /user/name }

{ "user": { "name": "Ada" } }

writes "Ada" to /name.

target

Core. Reads what earlier pairings wrote at the current nesting level.

/id: { constant: 7 }
/copy: { target: /id }

produces { "id": 7, "copy": 7 }.

input

Core. Reads from the root input, regardless of scope. Use it to escape a nested scope:

/out:
  source: /nested
  mapping:
    /fromScope: /val
    /fromRoot: { input: /rootVal }

{ "rootVal": "R", "nested": { "val": "V" } }

produces { "out": { "fromScope": "V", "fromRoot": "R" } }.

output

Core. Reads from the root output produced so far. Later pairings see earlier writes:

/a: { constant: 1 }
/b: { output: /a }

produces { "a": 1, "b": 1 }.