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util/template.lua @ 12480:7e9ebdc75ce4
net: isolate LuaSec-specifics
For this, various accessor functions are now provided directly on the
sockets, which reach down into the LuaSec implementation to obtain the
information.
While this may seem of little gain at first, it hides the implementation
detail of the LuaSec+LuaSocket combination that the actual socket and
the TLS layer are separate objects.
The net gain here is that an alternative implementation does not have to
emulate that specific implementation detail and "only" has to expose
LuaSec-compatible data structures on the new functions.
author | Jonas Schäfer <jonas@wielicki.name> |
---|---|
date | Wed, 27 Apr 2022 17:44:14 +0200 |
parent | 8555:4f0f5b49bb03 |
child | 12975:d10957394a3c |
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-- luacheck: ignore 213/i local stanza_mt = require "util.stanza".stanza_mt; local setmetatable = setmetatable; local pairs = pairs; local ipairs = ipairs; local error = error; local envload = require "util.envload".envload; local debug = debug; local t_remove = table.remove; local parse_xml = require "util.xml".parse; local _ENV = nil; -- luacheck: std none local function trim_xml(stanza) for i=#stanza,1,-1 do local child = stanza[i]; if child.name then trim_xml(child); else child = child:gsub("^%s*", ""):gsub("%s*$", ""); stanza[i] = child; if child == "" then t_remove(stanza, i); end end end end local function create_string_string(str) str = ("%q"):format(str); str = str:gsub("{([^}]*)}", function(s) return '"..(data["'..s..'"]or"").."'; end); return str; end local function create_attr_string(attr, xmlns) local str = '{'; for name,value in pairs(attr) do if name ~= "xmlns" or value ~= xmlns then str = str..("[%q]=%s;"):format(name, create_string_string(value)); end end return str..'}'; end local function create_clone_string(stanza, lookup, xmlns) if not lookup[stanza] then local s = ('setmetatable({name=%q,attr=%s,tags={'):format(stanza.name, create_attr_string(stanza.attr, xmlns)); -- add tags for i,tag in ipairs(stanza.tags) do s = s..create_clone_string(tag, lookup, stanza.attr.xmlns)..";"; end s = s..'};'; -- add children for i,child in ipairs(stanza) do if child.name then s = s..create_clone_string(child, lookup, stanza.attr.xmlns)..";"; else s = s..create_string_string(child)..";" end end s = s..'}, stanza_mt)'; s = s:gsub('%.%.""', ""):gsub('([=;])""%.%.', "%1"):gsub(';"";', ";"); -- strip empty strings local n = #lookup + 1; lookup[n] = s; lookup[stanza] = "_"..n; end return lookup[stanza]; end local function create_cloner(stanza, chunkname) local lookup = {}; local name = create_clone_string(stanza, lookup, ""); local src = "local setmetatable,stanza_mt=...;return function(data)"; for i=1,#lookup do src = src.."local _"..i.."="..lookup[i]..";"; end src = src.."return "..name..";end"; local f,err = envload(src, chunkname); if not f then error(err); end return f(setmetatable, stanza_mt); end local template_mt = { __tostring = function(t) return t.name end }; local function create_template(templates, text) local stanza, err = parse_xml(text); if not stanza then error(err); end trim_xml(stanza); local info = debug.getinfo(3, "Sl"); info = info and ("template(%s:%d)"):format(info.short_src:match("[^\\/]*$"), info.currentline) or "template(unknown)"; local template = setmetatable({ apply = create_cloner(stanza, info), name = info, text = text }, template_mt); templates[text] = template; return template; end local templates = setmetatable({}, { __mode = 'k', __index = create_template }); return function(text) return templates[text]; end;