47 lines
2.0 KiB
C++
47 lines
2.0 KiB
C++
#pragma once
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#include <faset/core/json.hpp>
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#include <faset/core/error.hpp>
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#include <map>
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#include <string>
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#include <type_traits>
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namespace faset::authoring {
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class SchemaRegistry {
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public:
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void register_schema(const Json& schema);
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void register_schemas(const Json& schemas);
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bool contains(const std::string& type) const;
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Json schema(const std::string& type) const;
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Json manifest() const;
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Json default_fields(const std::string& type) const;
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// Unknown fields and absent schemas survive authoring. Known fields are validated.
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void validate_component(const Json& component) const;
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Json migrate_component(const Json& component) const;
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void add_migration(const std::string& type, int from_version, Json field_rules);
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private:
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std::map<std::string,Json> schemas_;
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std::map<std::pair<std::string,int>,Json> migrations_;
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};
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template<class T> class TypeRegistration {
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public:
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TypeRegistration(SchemaRegistry& registry, std::string id, std::string name, int version=1)
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: registry_(registry),schema_{{"id",std::move(id)},{"name",std::move(name)},{"version",version},{"fields",Json::object()}} {}
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template<class Value>
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TypeRegistration& field(std::string id, std::string name, Value T::*member, Value default_value,
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std::string kind, Json constraints=Json::object()) {
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static_assert(std::is_member_object_pointer_v<decltype(member)>);
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require(!schema_["fields"].contains(id),"schema.duplicate_field","Duplicate stable FieldId");
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// Converting the typed default checks supported JSON serialization at compile time.
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Json descriptor={{"id",id},{"name",std::move(name)},{"type",std::move(kind)},{"default",Json(default_value)}};
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descriptor.update(constraints); schema_["fields"][id]=std::move(descriptor); return *this;
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}
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void commit() { registry_.register_schema(schema_); }
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private:
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SchemaRegistry& registry_;
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Json schema_;
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};
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SchemaRegistry builtin_schemas();
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void validate_field(const Json& value,const Json& descriptor);
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}
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