Allow variable refs as object keys {$key:value}

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Users are often surprised by the requirement to parenthesize any
non-trivial object key expressions in object constructors.  E.g.,
{"a"+"b":1}.  This commit adds one more kind of key expression besides
literals and idents: variable references.

A common use case for this is jq programs as JSON templates to fill in
with variables computed from inputs or passed in on the command-line.
E.g., {some_key:$value}.  Now users can also use, e.g., {$key:$value}.

This and the restrictions on key and value expressions in object
constructors are now clarified a bit in the documentation.

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This commit is contained in:

Nicolas Williams committed 2018-12-10 21:54:59 -06:00

1 parent bb87e6e30f

commit 8ea4a5584e

3 files changed

+607 -583

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