prosody
b4c0efff8dd3
util/jsonpointer.lua

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util/jsonpointer.lua @ 12131:b4c0efff8dd3

util.jsonpointer: Resolve JSON Pointers per RFC 6901
author Kim Alvefur <zash@zash.se>
date Wed, 29 Dec 2021 16:52:09 +0100
child 12496:87c3d45208ef
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12131
b4c0efff8dd3 util.jsonpointer: Resolve JSON Pointers per RFC 6901
Kim Alvefur <zash@zash.se>
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1 local function unescape_token(escaped_token)
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2 local unescaped = escaped_token:gsub("~1", "/"):gsub("~0", "~")
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3 return unescaped
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4 end
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5
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6 local function resolve_json_pointer(ref, path)
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7 local ptr_len = #path + 1
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8 for part, pos in path:gmatch("/([^/]*)()") do
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9 local token = unescape_token(part)
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10 if not (type(ref) == "table") then
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11 return nil
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12 end
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13 local idx = next(ref)
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14 local new_ref
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15
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16 if type(idx) == "string" then
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17 new_ref = ref[token]
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18 elseif math.type(idx) == "integer" then
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19 local i = tonumber(token)
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20 if token == "-" then
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21 i = #ref + 1
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22 end
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23 new_ref = ref[i]
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24 else
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25 return nil, "invalid-table"
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26 end
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27
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28 if pos == ptr_len then
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29 return new_ref
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30 elseif type(new_ref) == "table" then
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31 ref = new_ref
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32 elseif not (type(ref) == "table") then
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33 return nil, "invalid-path"
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34 end
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35
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36 end
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37 return ref
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38 end
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39
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40 return { resolve = resolve_json_pointer }