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-- Copyright (C) 2021 Kim Alvefur
--
-- This project is MIT/X11 licensed. Please see the
-- COPYING file in the source package for more information.
--
-- Based on
-- https://json-schema.org/draft/2020-12/json-schema-core.html
-- https://json-schema.org/draft/2020-12/json-schema-validation.html
-- http://spec.openapis.org/oas/v3.0.1#xmlObject
-- https://github.com/OAI/OpenAPI-Specification/issues/630 (text:true)
--
-- XML Object Extensions:
-- text to refer to the text content at the same time as attributes
-- x_name_is_value for enum fields where the <tag-name/> is the value
-- x_single_attribute for <tag attr="this"/>
--
-- TODO arrays
-- TODO pointers
-- TODO cleanup / refactor
--
local st = require "util.stanza";
local js = require "util.jsonschema"
local function toboolean ( s : string ) : boolean
if s == "true" or s == "1" then
return true
elseif s == "false" or s == "0" then
return false
end
end
local function parse_object (schema : js.schema_t, s : st.stanza_t) : table
local out : { string : any } = {}
if schema.properties then
for prop, propschema in pairs(schema.properties) do
-- TODO factor out, if it's generic enough
local name = prop
local namespace = s.attr.xmlns;
local prefix : string = nil
local is_attribute = false
local is_text = false
local name_is_value = false;
local single_attribute : string
local enums : { any }
local proptype : js.schema_t.type_e
if propschema is js.schema_t then
proptype = propschema.type
elseif propschema is js.schema_t.type_e then
proptype = propschema
end
if propschema is js.schema_t and propschema.xml then
if propschema.xml.name then
name = propschema.xml.name
end
if propschema.xml.namespace then
namespace = propschema.xml.namespace
end
if propschema.xml.prefix then
prefix = propschema.xml.prefix
end
if propschema.xml.attribute then
is_attribute = true
elseif propschema.xml.text then
-- XXX Not yet in OpenAPI
is_text = true
elseif propschema.xml.x_name_is_value then
-- XXX Custom extension
name_is_value = true
elseif propschema.xml.x_single_attribute then
-- XXX Custom extension
single_attribute = propschema.xml.x_single_attribute
end
if propschema["const"] then
enums = { propschema["const"] }
elseif propschema["enum"] then
enums = propschema["enum"]
end
end
if name_is_value then
local c : st.stanza_t
if proptype == "boolean" then
c = s:get_child(name, namespace);
elseif enums and proptype == "string" then
-- XXX O(n²) ?
-- Probably better to flip the table and loop over :childtags(nil, ns), should be 2xO(n)
-- BUT works first, optimize later
for i = 1, #enums do
c = s:get_child(enums[i] as string, namespace);
if c then break end
end
else
c = s:get_child(nil, namespace);
end
if c and proptype == "string" then
out[prop] = c.name;
elseif proptype == "boolean" and c then
out[prop] = true;
end
elseif is_attribute then
local attr = name
if prefix then
attr = prefix .. ':' .. name
elseif namespace ~= s.attr.xmlns then
attr = namespace .. "\1" .. name
end
if proptype == "string" then
out[prop] = s.attr[attr]
elseif proptype == "integer" or proptype == "number" then
-- TODO floor if integer ?
out[prop] = tonumber(s.attr[attr])
elseif proptype == "boolean" then
out[prop] = toboolean(s.attr[attr])
-- else TODO
end
elseif is_text then
if proptype == "string" then
out[prop] = s:get_text()
elseif proptype == "integer" or proptype == "number" then
out[prop] = tonumber(s:get_text())
end
elseif single_attribute then
local c = s:get_child(name, namespace)
local a = c and c.attr[single_attribute]
if proptype == "string" then
out[prop] = a
elseif proptype == "integer" or proptype == "number" then
out[prop] = tonumber(a)
elseif proptype == "boolean" then
out[prop] = toboolean(a)
end
else
if proptype == "string" then
out[prop] = s:get_child_text(name, namespace)
elseif proptype == "integer" or proptype == "number" then
out[prop] = tonumber(s:get_child_text(name, namespace))
elseif proptype == "object" and propschema is js.schema_t then
local c = s:get_child(name, namespace)
if c then
out[prop] = parse_object(propschema, c);
end
-- else TODO
end
end
end
end
return out
end
local function parse (schema : js.schema_t, s : st.stanza_t) : table
if schema.type == "object" then
return parse_object(schema, s)
end
end
local function unparse ( schema : js.schema_t, t : table, current_name : string, current_ns : string ) : st.stanza_t
if schema.type == "object" then
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
-- TODO prefix?
end
local out = st.stanza(current_name, { xmlns = current_ns })
for prop, propschema in pairs(schema.properties) do
local v = t[prop]
if v ~= nil then
local proptype : js.schema_t.type_e
if propschema is js.schema_t then
proptype = propschema.type
elseif propschema is js.schema_t.type_e then
proptype = propschema
end
local name = prop
local namespace = current_ns
local prefix : string = nil
local is_attribute = false
local is_text = false
local name_is_value = false;
local single_attribute : string
if propschema is js.schema_t and propschema.xml then
if propschema.xml.name then
name = propschema.xml.name
end
if propschema.xml.namespace then
namespace = propschema.xml.namespace
end
if propschema.xml.prefix then
prefix = propschema.xml.prefix
end
if propschema.xml.attribute then
is_attribute = true
elseif propschema.xml.text then
is_text = true
elseif propschema.xml.x_name_is_value then
name_is_value = true
elseif propschema.xml.x_single_attribute then
single_attribute = propschema.xml.x_single_attribute
end
end
if is_attribute then
local attr = name
if prefix then
attr = prefix .. ':' .. name
elseif namespace ~= current_ns then
attr = namespace .. "\1" .. name
end
if proptype == "string" and v is string then
out.attr[attr] = v
elseif proptype == "number" and v is number then
out.attr[attr] = string.format("%g", v)
elseif proptype == "integer" and v is number then
out.attr[attr] = string.format("%d", v)
elseif proptype == "boolean" then
out.attr[attr] = v and "1" or "0"
end
elseif is_text then
if v is string then
out:text(v)
end
elseif single_attribute then
local propattr : { string : string } = {}
if namespace ~= current_ns then
propattr.xmlns = namespace
end
if proptype == "string" and v is string then
propattr[single_attribute] = v
elseif proptype == "number" and v is number then
propattr[single_attribute] = string.format("%g", v)
elseif proptype == "integer" and v is number then
propattr[single_attribute] = string.format("%d", v)
elseif proptype == "boolean" and v is boolean then
propattr[single_attribute] = v and "1" or "0"
end
out:tag(name, propattr):up();
else
local propattr : { string : string }
if namespace ~= current_ns then
propattr = { xmlns = namespace }
end
if name_is_value then
if proptype == "string" and v is string then
out:tag(v, propattr):up();
elseif proptype == "boolean" and v == true then
out:tag(name, propattr):up();
end
elseif proptype == "string" and v is string then
out:text_tag(name, v, propattr)
elseif proptype == "number" and v is number then
out:text_tag(name, string.format("%g", v), propattr)
elseif proptype == "integer" and v is number then
out:text_tag(name, string.format("%d", v), propattr)
elseif proptype == "boolean" and v is boolean then
out:text_tag(name, v and "1" or "0", propattr)
elseif proptype == "object" and propschema is js.schema_t and v is table then
local c = unparse(propschema, v, name, namespace);
if c then
out:add_direct_child(c);
end
-- else TODO
end
end
end
end
return out;
end
end
return {
parse = parse,
unparse = unparse,
}
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