Software /
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prosody
File
util/argparse.lua @ 10973:39991e40d1dc
util.dbuffer: dynamic string buffer
Similar to util.ringbuffer (and shares almost identical API). Differences:
- size limit is optional and dynamic
- does not allocate a fixed buffer of max_size bytes
- focus on simply storing references to existing string objects where possible,
avoiding unnecessary allocations
- references are still stored in a ring buffer to enable use as a fast FIFO
Optional second parameter to new() provides the number of ring buffer segments. On
Lua 5.2 on my laptop, a segment is ~19 bytes. If the ring buffer fills up, the next
write will compact all strings into a single item.
author | Matthew Wild <mwild1@gmail.com> |
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date | Fri, 26 Jun 2020 16:41:31 +0100 (2020-06-26) |
parent | 10936:d770435f0f84 |
child | 11846:6425dfa3de45 |
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local function parse(arg, config) local short_params = config and config.short_params or {}; local value_params = config and config.value_params or {}; local parsed_opts = {}; if #arg == 0 then return parsed_opts; end while true do local raw_param = arg[1]; if not raw_param then break; end local prefix = raw_param:match("^%-%-?"); if not prefix then break; elseif prefix == "--" and raw_param == "--" then table.remove(arg, 1); break; end local param = table.remove(arg, 1):sub(#prefix+1); if #param == 1 and short_params then param = short_params[param]; end if not param then return nil, "param-not-found", param; end local param_k, param_v; if value_params[param] then param_k, param_v = param, table.remove(arg, 1); if not param_v then return nil, "missing-value", raw_param; end else param_k, param_v = param:match("^([^=]+)=(.+)$"); if not param_k then if param:match("^no%-") then param_k, param_v = param:sub(4), false; else param_k, param_v = param, true; end end end parsed_opts[param_k] = param_v; end return parsed_opts; end return { parse = parse; }