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package tengo
// Importable interface represents importable module instance.
type Importable interface {
// Import should return either an Object or module source code ([]byte).
Import(moduleName string) (interface{}, error)
}
// ModuleGetter enables implementing dynamic module loading.
type ModuleGetter interface {
Get(name string) Importable
}
// ModuleMap represents a set of named modules. Use NewModuleMap to create a
// new module map.
type ModuleMap struct {
m map[string]Importable
}
// NewModuleMap creates a new module map.
func NewModuleMap() *ModuleMap {
return &ModuleMap{
m: make(map[string]Importable),
}
}
// Add adds an import module.
func (m *ModuleMap) Add(name string, module Importable) {
m.m[name] = module
}
// AddBuiltinModule adds a builtin module.
func (m *ModuleMap) AddBuiltinModule(name string, attrs map[string]Object) {
m.m[name] = &BuiltinModule{Attrs: attrs}
}
// AddSourceModule adds a source module.
func (m *ModuleMap) AddSourceModule(name string, src []byte) {
m.m[name] = &SourceModule{Src: src}
}
// Remove removes a named module.
func (m *ModuleMap) Remove(name string) {
delete(m.m, name)
}
// Get returns an import module identified by name. It returns if the name is
// not found.
func (m *ModuleMap) Get(name string) Importable {
return m.m[name]
}
// GetBuiltinModule returns a builtin module identified by name. It returns
// if the name is not found or the module is not a builtin module.
func (m *ModuleMap) GetBuiltinModule(name string) *BuiltinModule {
mod, _ := m.m[name].(*BuiltinModule)
return mod
}
// GetSourceModule returns a source module identified by name. It returns if
// the name is not found or the module is not a source module.
func (m *ModuleMap) GetSourceModule(name string) *SourceModule {
mod, _ := m.m[name].(*SourceModule)
return mod
}
// Copy creates a copy of the module map.
func (m *ModuleMap) Copy() *ModuleMap {
c := &ModuleMap{
m: make(map[string]Importable),
}
for name, mod := range m.m {
c.m[name] = mod
}
return c
}
// Len returns the number of named modules.
func (m *ModuleMap) Len() int {
return len(m.m)
}
// AddMap adds named modules from another module map.
func (m *ModuleMap) AddMap(o *ModuleMap) {
for name, mod := range o.m {
m.m[name] = mod
}
}
// SourceModule is an importable module that's written in Tengo.
type SourceModule struct {
Src []byte
}
// Import returns a module source code.
func (m *SourceModule) Import(_ string) (interface{}, error) {
return m.Src, nil
}
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