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util/jsonpointer.lua @ 13182:c48ae06e24d6
util.datamanager: Fix indexing first item if not at the very start
If the first item does not start at position 0 then the index function
produces a phantom first entry covering position zero until where the
real first item starts. When using the index, this would make it either
appear as the first item was missing or cause an off-by-one issue with
remaining items.
author | Kim Alvefur <zash@zash.se> |
---|---|
date | Mon, 10 Jul 2023 17:19:05 +0200 |
parent | 12781:22066b02887f |
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local m_type = math.type; 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 m_type(idx) == "integer" then local i = tonumber(token) if token == "-" then i = #ref + 1 end new_ref = ref[i + 1] 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 }