prosody
2d3080d02960
teal-src/util/jsonpointer.tl

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teal-src/util/jsonpointer.tl @ 12386:2d3080d02960

net.websocket.frames: Replace bit fiddling code with util.struct Fallback code for not having either the string.pack and string.unpack functions available in Lua 5.4 or the struct lib is no longer needed since the struct lib was imported as util.struct in 3ce3633527af
author Kim Alvefur <zash@zash.se>
date Sun, 06 Mar 2022 15:13:50 +0100
parent 12131:b4c0efff8dd3
child 12496:87c3d45208ef
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
12131
b4c0efff8dd3 util.jsonpointer: Resolve JSON Pointers per RFC 6901
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1
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2 local enum ptr_error
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3 "invalid-table"
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4 "invalid-path"
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5 end
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6
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7 local function unescape_token(escaped_token : string) : string
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8 local unescaped = escaped_token:gsub("~1", "/"):gsub("~0", "~")
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9 return unescaped
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10 end
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12 local function resolve_json_pointer(ref : table, path : string) : any, ptr_error
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13 local ptr_len = #path+1
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14 for part, pos in path:gmatch("/([^/]*)()") do
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15 local token = unescape_token(part)
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16 if not ref is table then
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17 return nil
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18 end
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19 local idx = next(ref)
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20 local new_ref : any
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21
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22 if idx is string then
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23 new_ref = ref[token]
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24 elseif idx is integer then
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25 local i = tonumber(token)
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26 if token == "-" then i = #ref + 1 end
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27 new_ref = ref[i]
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28 else
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29 return nil, "invalid-table"
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30 end
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31
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32 if pos as integer == ptr_len then
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33 return new_ref
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34 elseif new_ref is table then
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35 ref = new_ref
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36 elseif not ref is table then
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37 return nil, "invalid-path"
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38 end
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39
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40 end
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41 return ref
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42 end
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43
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44 return {
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45 resolve = resolve_json_pointer,
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46 }