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annotate util/jsonpointer.lua @ 12591:494577d883ff

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util.table: Fix inaccurate comment Probably a duplicate of the comment next to Lmove, recorded by mistake Lpack can probably be removed at some point in the near future once we are confident it is not used anywhere.
author Kim Alvefur <zash@zash.se>
date Mon, 11 Jul 2022 20:02:10 +0200
parents 03e307952816
children 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)
03e307952816 util.jsonpointer: Fix Lua <5.3 compat
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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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03e307952816 util.jsonpointer: Fix Lua <5.3 compat
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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 }