Software / code / prosody
Changeset
12407:b6b01724e04f
util.stanza: Create tables with correct size to avoid reallocations
Potential performance gain since the tables don't need to be resized as
they grow to the final size.
| author | Kim Alvefur <zash@zash.se> |
|---|---|
| date | Fri, 18 Mar 2022 16:43:06 +0100 |
| parents | 12406:a3ddf3f42212 |
| children | 12408:acfc51b9530c |
| files | util/stanza.lua |
| diffstat | 1 files changed, 15 insertions(+), 2 deletions(-) [+] |
line wrap: on
line diff
--- a/util/stanza.lua Fri Mar 18 16:39:48 2022 +0100 +++ b/util/stanza.lua Fri Mar 18 16:43:06 2022 +0100 @@ -22,6 +22,7 @@ local s_sub = string.sub; local s_find = string.find; local t_move = table.move or require "util.table".move; +local t_create = require"util.table".create; local valid_utf8 = require "util.encodings".utf8.valid; @@ -276,14 +277,26 @@ end local function _clone(stanza, only_top) - local attr, tags = {}, {}; + local attr = {}; for k,v in pairs(stanza.attr) do attr[k] = v; end local old_namespaces, namespaces = stanza.namespaces; if old_namespaces then namespaces = {}; for k,v in pairs(old_namespaces) do namespaces[k] = v; end end - local new = { name = stanza.name, attr = attr, namespaces = namespaces, tags = tags }; + local tags, new; + if only_top then + tags = {}; + new = { name = stanza.name, attr = attr, namespaces = namespaces, tags = tags }; + else + tags = t_create(#stanza.tags, 0); + new = t_create(#stanza, 4); + new.name = stanza.name; + new.attr = attr; + new.namespaces = namespaces; + new.tags = tags; + end + setmetatable(new, stanza_mt); if not only_top then t_move(stanza, 1, #stanza, 1, new);
