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Diffstat (limited to 'doc/doc-docbook/spec.xfpt')
| -rw-r--r-- | doc/doc-docbook/spec.xfpt | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/doc/doc-docbook/spec.xfpt b/doc/doc-docbook/spec.xfpt index 958e7caf6..46cab7c58 100644 --- a/doc/doc-docbook/spec.xfpt +++ b/doc/doc-docbook/spec.xfpt @@ -6742,6 +6742,24 @@ lookup types support only literal keys. the implicit key is the host's IP address rather than its name (see section &<<SECThoslispatsikey>>&). .next +.new +.cindex lookup json +.cindex json "lookup type" +.cindex JSON expansions +&(json)&: The given file is a text file with a JSON structure. +An element of the structure is extracted, defined by the search key. +The key is a list of subelement selectors +(colon-separated by default but changeable in the usual way) +which are applied in turn to select smaller and smaller portions +of the JSON structure. +If a selector is numeric, it must apply to a JSON array; the (zero-based) +nunbered array element is selected. +Otherwise it must apply to a JSON object; the named element is selected. +The final resulting object can be a simple JSOM type or a JSON object +or array; for the latter two a string-representation os the JSON +is returned. +.wen +.next .cindex "linear search" .cindex "lookup" "lsearch" .cindex "lsearch lookup type" |