Pointers and references: Difference between revisions
→{{header|jq}}: disambiguation
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all(.[]; type == "string" or (type == "number" and floor == .));
# The JSON Pointer spec allows 0 both for indexing an array and for retrieving a key named "0".
# like getpath() but for jsonpointer pointers▼
# disambiguate($k) accordingly disambiguates $k w.r.t. `.`.
# $k should be a string or integer.
# If $k is a string and . is an object then: if has($k) then $k else null end.
# If $k is an integer and . is an array, then emit $k.
# If $k is an integer-valued string and . is an array then exit $k|tonumber.
# Otherwise emit null
def disambiguate( $k ):
if ($k|type) == "string"
then if type == "object" then $k
elif type == "array" and ($k|test("^[0-9]+$"))
then ($k|tonumber)
else null
end
elif ($k|type) == "number" and type == "array"
then $k
else null
end;
# $array should be an array of strings and integers.
# Emit the disambiguated array, suitable for running getpath/1.
# Emit null if disambiguation fails at any point.
def disambiguatePath($array):
. as $in
| reduce $array[] as $x ([];
if . then . as $path
| ($in | getpath($path) | disambiguate($x)) as $y
| if $y then . + [ $y ]
else null
end
else .
end);
▲# getjsonpointer() is like getpath() but for jsonpointer pointers
def getjsonpointer($pointer):
. as $in
# first decode ~1, then ~0
| ($pointer | split("/") | .[1:]
| map(gsub("~1"; "/") | gsub("~0"; "~")
| disambiguatePath($array) as $apath
| if $apath then getpath($apath) else null end;
# like getpath() but allow $p to be a jsonpointer or an array
| |||