prosody
7929c0ffbe14
util/jsonpointer.lua

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util/jsonpointer.lua @ 12758:7929c0ffbe14 0.12

util.jsonschema: Ignore test case for JavaScript specific detail Also touching on how arrays are indistinguishable from tables in Lua
author Kim Alvefur <zash@zash.se>
date Sun, 09 Oct 2022 15:24:30 +0200
parent 12499:03e307952816
child 12781:22066b02887f
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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03e307952816 util.jsonpointer: Fix Lua <5.3 compat
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1 local m_type = math.type or function (n)
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2 return n % 1 == 0 and n <= 9007199254740992 and n >= -9007199254740992 and "integer" or "float";
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3 end;
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4
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5 local function unescape_token(escaped_token)
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6 local unescaped = escaped_token:gsub("~1", "/"):gsub("~0", "~")
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7 return unescaped
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8 end
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9
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10 local function resolve_json_pointer(ref, path)
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11 local ptr_len = #path + 1
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12 for part, pos in path:gmatch("/([^/]*)()") do
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13 local token = unescape_token(part)
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14 if not (type(ref) == "table") then
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15 return nil
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16 end
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17 local idx = next(ref)
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18 local new_ref
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19
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20 if type(idx) == "string" then
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21 new_ref = ref[token]
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22 elseif m_type(idx) == "integer" then
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23 local i = tonumber(token)
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24 if token == "-" then
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25 i = #ref + 1
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26 end
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27 new_ref = ref[i + 1]
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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 == ptr_len then
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33 return new_ref
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34 elseif type(new_ref) == "table" then
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35 ref = new_ref
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36 elseif not (type(ref) == "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 { resolve = resolve_json_pointer }