File

util/datamapper.lua @ 12591:494577d883ff

util.table: Fix inaccurate comment Probably a duplicate of the comment next to Lmove, recorded by mistake Lpack can probably be removed at some point in the near future once we are confident it is not used anywhere.
author Kim Alvefur <zash@zash.se>
date Mon, 11 Jul 2022 20:02:10 +0200
parent 12580:a9dbf657c894
child 12782:8815d3090928
line wrap: on
line source

-- This file is generated from teal-src/util/datamapper.lua

local st = require("util.stanza");
local pointer = require("util.jsonpointer");

local schema_t = {}

local function toboolean(s)
	if s == "true" or s == "1" then
		return true
	elseif s == "false" or s == "0" then
		return false
	elseif s then
		return true
	end
end

local function totype(t, s)
	if not s then
		return nil
	end
	if t == "string" then
		return s
	elseif t == "boolean" then
		return toboolean(s)
	elseif t == "number" or t == "integer" then
		return tonumber(s)
	end
end

local value_goes = {}

local function resolve_schema(schema, root)
	if type(schema) == "table" then
		if schema["$ref"] and schema["$ref"]:sub(1, 1) == "#" then
			return pointer.resolve(root, schema["$ref"]:sub(2))
		end
	end
	return schema
end

local function guess_schema_type(schema)
	local schema_types = schema.type
	if type(schema_types) == "string" then
		return schema_types
	elseif schema_types ~= nil then
		error("schema has unsupported 'type' property")
	elseif schema.properties then
		return "object"
	elseif schema.items then
		return "array"
	end
	return "string"
end

local function unpack_propschema(propschema, propname, current_ns)

	local proptype = "string"
	local value_where = propname and "in_text_tag" or "in_text"
	local name = propname
	local namespace
	local prefix
	local single_attribute
	local enums

	if type(propschema) == "table" then
		proptype = guess_schema_type(propschema);
	elseif type(propschema) == "string" then
		error("schema as string is not supported: " .. propschema .. " {" .. current_ns .. "}" .. propname)
	end

	if proptype == "object" or proptype == "array" then
		value_where = "in_children"
	end

	if type(propschema) == "table" then
		local xml = propschema.xml
		if xml then
			if xml.name then
				name = xml.name
			end
			if xml.namespace and xml.namespace ~= current_ns then
				namespace = xml.namespace
			end
			if xml.prefix then
				prefix = xml.prefix
			end
			if proptype == "array" and xml.wrapped then
				value_where = "in_wrapper"
			elseif xml.attribute then
				value_where = "in_attribute"
			elseif xml.text then
				value_where = "in_text"
			elseif xml.x_name_is_value then
				value_where = "in_tag_name"
			elseif xml.x_single_attribute then
				single_attribute = xml.x_single_attribute
				value_where = "in_single_attribute"
			end
		end
		if propschema["const"] then
			enums = {propschema["const"]}
		elseif propschema["enum"] then
			enums = propschema["enum"]
		end
	end

	return proptype, value_where, name, namespace, prefix, single_attribute, enums
end

local parse_object
local parse_array

local function extract_value(s, value_where, proptype, name, namespace, prefix, single_attribute, enums)
	if value_where == "in_tag_name" then
		local c
		if proptype == "boolean" then
			c = s:get_child(name, namespace);
		elseif enums and proptype == "string" then

			for i = 1, #enums do
				c = s:get_child(enums[i], namespace);
				if c then
					break
				end
			end
		else
			c = s:get_child(nil, namespace);
		end
		if c then
			return c.name
		end
	elseif value_where == "in_attribute" then
		local attr = name
		if prefix then
			attr = prefix .. ":" .. name
		elseif namespace and namespace ~= s.attr.xmlns then
			attr = namespace .. "\1" .. name
		end
		return s.attr[attr]

	elseif value_where == "in_text" then
		return s:get_text()

	elseif value_where == "in_single_attribute" then
		local c = s:get_child(name, namespace)
		return c and c.attr[single_attribute]
	elseif value_where == "in_text_tag" then
		return s:get_child_text(name, namespace)
	end
end

function parse_object(schema, s, root)
	local out = {}
	schema = resolve_schema(schema, root)
	if type(schema) == "table" and schema.properties then
		for prop, propschema in pairs(schema.properties) do
			propschema = resolve_schema(propschema, root)

			local proptype, value_where, name, namespace, prefix, single_attribute, enums = unpack_propschema(propschema, prop, s.attr.xmlns)

			if value_where == "in_children" and type(propschema) == "table" then
				if proptype == "object" then
					local c = s:get_child(name, namespace)
					if c then
						out[prop] = parse_object(propschema, c, root);
					end
				elseif proptype == "array" then
					local a = parse_array(propschema, s, root);
					if a and a[1] ~= nil then
						out[prop] = a;
					end
				else
					error("unreachable")
				end
			elseif value_where == "in_wrapper" and type(propschema) == "table" and proptype == "array" then
				local wrapper = s:get_child(name, namespace);
				if wrapper then
					out[prop] = parse_array(propschema, wrapper, root);
				end
			else
				local value = extract_value(s, value_where, proptype, name, namespace, prefix, single_attribute, enums)

				out[prop] = totype(proptype, value)
			end
		end
	end

	return out
end

function parse_array(schema, s, root)
	local itemschema = resolve_schema(schema.items, root);
	local proptype, value_where, child_name, namespace, prefix, single_attribute, enums = unpack_propschema(itemschema, nil, s.attr.xmlns)
	local attr_name
	if value_where == "in_single_attribute" then
		value_where = "in_attribute";
		attr_name = single_attribute;
	end
	local out = {}

	if proptype == "object" then
		if type(itemschema) == "table" then
			for c in s:childtags(child_name, namespace) do
				table.insert(out, parse_object(itemschema, c, root));
			end
		else
			error("array items must be schema object")
		end
	elseif proptype == "array" then
		if type(itemschema) == "table" then
			for c in s:childtags(child_name, namespace) do
				table.insert(out, parse_array(itemschema, c, root));
			end
		end
	else
		for c in s:childtags(child_name, namespace) do
			local value = extract_value(c, value_where, proptype, attr_name or child_name, namespace, prefix, single_attribute, enums)

			table.insert(out, totype(proptype, value));
		end
	end
	return out
end

local function parse(schema, s)
	local s_type = guess_schema_type(schema)
	if s_type == "object" then
		return parse_object(schema, s, schema)
	elseif s_type == "array" then
		return parse_array(schema, s, schema)
	else
		error("top-level scalars unsupported")
	end
end

local function toxmlstring(proptype, v)
	if proptype == "string" and type(v) == "string" then
		return v
	elseif proptype == "number" and type(v) == "number" then
		return string.format("%g", v)
	elseif proptype == "integer" and type(v) == "number" then
		return string.format("%d", v)
	elseif proptype == "boolean" then
		return v and "1" or "0"
	end
end

local unparse

local function unparse_property(out, v, proptype, propschema, value_where, name, namespace, current_ns, prefix,
	single_attribute, root)

	if value_where == "in_attribute" then
		local attr = name
		if prefix then
			attr = prefix .. ":" .. name
		elseif namespace and namespace ~= current_ns then
			attr = namespace .. "\1" .. name
		end

		out.attr[attr] = toxmlstring(proptype, v)
	elseif value_where == "in_text" then
		out:text(toxmlstring(proptype, v))
	elseif value_where == "in_single_attribute" then
		assert(single_attribute)
		local propattr = {}

		if namespace and namespace ~= current_ns then
			propattr.xmlns = namespace
		end

		propattr[single_attribute] = toxmlstring(proptype, v)
		out:tag(name, propattr):up();

	else
		local propattr
		if namespace ~= current_ns then
			propattr = {xmlns = namespace}
		end
		if value_where == "in_tag_name" then
			if proptype == "string" and type(v) == "string" then
				out:tag(v, propattr):up();
			elseif proptype == "boolean" and v == true then
				out:tag(name, propattr):up();
			end
		elseif proptype == "object" and type(propschema) == "table" and type(v) == "table" then
			local c = unparse(propschema, v, name, namespace, nil, root);
			if c then
				out:add_direct_child(c);
			end
		elseif proptype == "array" and type(propschema) == "table" and type(v) == "table" then
			if value_where == "in_wrapper" then
				local c = unparse(propschema, v, name, namespace, nil, root);
				if c then
					out:add_direct_child(c);
				end
			else
				unparse(propschema, v, name, namespace, out, root);
			end
		else
			out:text_tag(name, toxmlstring(proptype, v), propattr)
		end
	end
end

function unparse(schema, t, current_name, current_ns, ctx, root)

	if root == nil then
		root = schema
	end

	if schema.xml then
		if schema.xml.name then
			current_name = schema.xml.name
		end
		if schema.xml.namespace then
			current_ns = schema.xml.namespace
		end

	end

	local out = ctx or st.stanza(current_name, {xmlns = current_ns})

	local s_type = guess_schema_type(schema)
	if s_type == "object" then

		for prop, propschema in pairs(schema.properties) do
			propschema = resolve_schema(propschema, root)
			local v = t[prop]

			if v ~= nil then
				local proptype, value_where, name, namespace, prefix, single_attribute = unpack_propschema(propschema, prop, current_ns)
				unparse_property(out, v, proptype, propschema, value_where, name, namespace, current_ns, prefix, single_attribute, root)
			end
		end
		return out

	elseif s_type == "array" then
		local itemschema = resolve_schema(schema.items, root)
		local proptype, value_where, name, namespace, prefix, single_attribute = unpack_propschema(itemschema, current_name, current_ns)
		for _, item in ipairs(t) do
			unparse_property(out, item, proptype, itemschema, value_where, name, namespace, current_ns, prefix, single_attribute, root)
		end
		return out
	end
end

return {parse = parse; unparse = unparse}