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util/jsonpointer.lua @ 12316:6bb2f660f689
util.poll: Add support for the poll() API
Might be better than select(), more portable than epoll.
author | Kim Alvefur <zash@zash.se> |
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date | Wed, 23 Feb 2022 20:31:03 +0100 |
parent | 12131:b4c0efff8dd3 |
child | 12496:87c3d45208ef |
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local function unescape_token(escaped_token) local unescaped = escaped_token:gsub("~1", "/"):gsub("~0", "~") return unescaped end local function resolve_json_pointer(ref, path) local ptr_len = #path + 1 for part, pos in path:gmatch("/([^/]*)()") do local token = unescape_token(part) if not (type(ref) == "table") then return nil end local idx = next(ref) local new_ref if type(idx) == "string" then new_ref = ref[token] elseif math.type(idx) == "integer" then local i = tonumber(token) if token == "-" then i = #ref + 1 end new_ref = ref[i] else return nil, "invalid-table" end if pos == ptr_len then return new_ref elseif type(new_ref) == "table" then ref = new_ref elseif not (type(ref) == "table") then return nil, "invalid-path" end end return ref end return { resolve = resolve_json_pointer }