query-go

This is a Go package to extract element from a Go value by a query string like $.key[0].key['key']. See usage and example in GoDoc.

Basic Usage

ParseString parses a query string and returns the query which extracts the value.

q, err := query.ParseString(`$.key[0].key['key']`)
v, err := q.Extract(target)

Query Syntax

The query syntax understood by this package when parsing is as follows.

$           the root element
.key        extracts by a key of map or field name of struct ("." can be omitted if the head of query)
['key']     same as the ".key" (if the key contains "\" or "'", these characters must be escaped like "\\", "\'")
[0]         extracts by a index of array or slice