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util/bit53.lua @ 12636:e8934ce6ea0f
util.stanza: Add method for extracting a single attribute value
Sometimes you only care about a single attribute, but the child tag
itself may be optional, leading to needing `tag and tag.attr.foo` or
`stanza:find("tag@foo")`.
The `:find()` method is fairly complex, so avoiding it for this kind of
simpler use case is a win.
author | Kim Alvefur <zash@zash.se> |
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date | Wed, 17 Aug 2022 19:04:30 +0200 |
parent | 12365:af02b033bd7f |
child | 13449:9912baa541c0 |
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-- Only the operators needed by net.websocket.frames are provided at this point return { band = function (a, b, ...) local ret = a & b; if ... then for i = 1, select("#", ...) do ret = ret & (select(i, ...)); end end return ret; end; bor = function (a, b, ...) local ret = a | b; if ... then for i = 1, select("#", ...) do ret = ret | (select(i, ...)); end end return ret; end; bxor = function (a, b, ...) local ret = a ~ b; if ... then for i = 1, select("#", ...) do ret = ret ~ (select(i, ...)); end end return ret; end; rshift = function (a, n) return a >> n end; lshift = function (a, n) return a << n end; };