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util/template.lua @ 12580:a9dbf657c894 0.12
util.datamapper: Improve handling of schemas with non-obvious "type"
The JSON Schema specification says that schemas are objects or booleans,
and that the 'type' property is optional and can be an array.
This module previously allowed bare type names as schemas and did not
really handle booleans.
It now handles missing 'type' properties and boolean 'true' as a schema.
Objects and arrays are guessed based on the presence of 'properties' or
'items' field.
author | Kim Alvefur <zash@zash.se> |
---|---|
date | Fri, 08 Jul 2022 17:32:48 +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;