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util/jsonpointer.lua @ 12603:05ca75309fa0
mod_admin_shell: Remove obsolete module:load() argument from 0.8 time
This 'config' argument was removed without explanation in d8dbf569766c
author | Kim Alvefur <zash@zash.se> |
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date | Fri, 05 Aug 2022 14:41:13 +0200 |
parent | 12499:03e307952816 |
child | 12781:22066b02887f |
rev | line source |
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12499
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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 } |