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package mangler
import (
"reflect"
)
// loadMangler is the top-most Mangler load function. It guarantees that a Mangler
// function will be returned for given value interface{} and reflected type. Else panics.
func loadMangler(a any, t reflect.Type) Mangler {
// Load mangler fn
mng := load(a, t)
if mng != nil {
return mng
}
// No mangler function could be determined
panic("cannot mangle type: " + t.String())
}
// load will load a Mangler or reflect Mangler for given type and iface 'a'.
// Note: allocates new interface value if nil provided, i.e. if coming via reflection.
func load(a any, t reflect.Type) Mangler {
if t == nil {
// There is no reflect type to search by
panic("cannot mangle nil interface{} type")
}
if a == nil {
// Alloc new iface instance
v := reflect.New(t).Elem()
a = v.Interface()
}
// Check for Mangled implementation.
if _, ok := a.(Mangled); ok {
return mangle_mangled
}
// Search mangler by reflection.
mng := loadReflect(t)
if mng != nil {
return mng
}
// Prefer iface mangler.
mng = loadIface(a)
if mng != nil {
return mng
}
return nil
}
// loadIface is used as a near-last-resort interface{} type switch
// loader for types implementating other known (slower) functions.
func loadIface(a any) Mangler {
switch a.(type) {
case binarymarshaler:
return mangle_binary
case byteser:
return mangle_byteser
case stringer:
return mangle_stringer
case textmarshaler:
return mangle_text
case jsonmarshaler:
return mangle_json
default:
return nil
}
}
// loadReflect will load a Mangler (or rMangler) function for the given reflected type info.
// NOTE: this is used as the top level load function for nested reflective searches.
func loadReflect(t reflect.Type) Mangler {
switch t.Kind() {
case reflect.Pointer:
return loadReflectPtr(t)
case reflect.String:
return mangle_string
case reflect.Struct:
return loadReflectStruct(t)
case reflect.Array:
return loadReflectArray(t)
case reflect.Slice:
return loadReflectSlice(t)
case reflect.Map:
return loadReflectMap(t)
case reflect.Bool:
return mangle_bool
case reflect.Int,
reflect.Uint,
reflect.Uintptr:
return mangle_platform_int()
case reflect.Int8, reflect.Uint8:
return mangle_8bit
case reflect.Int16, reflect.Uint16:
return mangle_16bit
case reflect.Int32, reflect.Uint32:
return mangle_32bit
case reflect.Int64, reflect.Uint64:
return mangle_64bit
case reflect.Float32:
return mangle_32bit
case reflect.Float64:
return mangle_64bit
case reflect.Complex64:
return mangle_64bit
case reflect.Complex128:
return mangle_128bit
default:
return nil
}
}
// loadReflectPtr loads a Mangler (or rMangler) function for a ptr's element type.
// This also handles further dereferencing of any further ptr indrections (e.g. ***int).
func loadReflectPtr(t reflect.Type) Mangler {
var count int
// Elem
et := t
// Iteratively dereference ptrs
for et.Kind() == reflect.Pointer {
et = et.Elem()
count++
}
// Search for ptr elemn type mangler.
if mng := load(nil, et); mng != nil {
return deref_ptr_mangler(et, mng, count)
}
return nil
}
// loadReflectKnownSlice loads a Mangler function for a
// known slice-of-element type (in this case, primtives).
func loadReflectKnownSlice(et reflect.Type) Mangler {
switch et.Kind() {
case reflect.String:
return mangle_string_slice
case reflect.Bool:
return mangle_bool_slice
case reflect.Int,
reflect.Uint,
reflect.Uintptr:
return mangle_platform_int_slice()
case reflect.Int8, reflect.Uint8:
return mangle_8bit_slice
case reflect.Int16, reflect.Uint16:
return mangle_16bit_slice
case reflect.Int32, reflect.Uint32:
return mangle_32bit_slice
case reflect.Int64, reflect.Uint64:
return mangle_64bit_slice
case reflect.Float32:
return mangle_32bit_slice
case reflect.Float64:
return mangle_64bit_slice
case reflect.Complex64:
return mangle_64bit_slice
case reflect.Complex128:
return mangle_128bit_slice
default:
return nil
}
}
// loadReflectSlice ...
func loadReflectSlice(t reflect.Type) Mangler {
// Element type
et := t.Elem()
// Preferably look for known slice mangler func
if mng := loadReflectKnownSlice(et); mng != nil {
return mng
}
// Fallback to nested mangler iteration.
if mng := load(nil, et); mng != nil {
return iter_slice_mangler(t, mng)
}
return nil
}
// loadReflectArray ...
func loadReflectArray(t reflect.Type) Mangler {
// Element type.
et := t.Elem()
// Use manglers for nested iteration.
if mng := load(nil, et); mng != nil {
return iter_array_mangler(t, mng)
}
return nil
}
// loadReflectMap ...
func loadReflectMap(t reflect.Type) Mangler {
// Map types.
kt := t.Key()
et := t.Elem()
// Load manglers.
kmng := load(nil, kt)
emng := load(nil, et)
// Use manglers for nested iteration.
if kmng != nil && emng != nil {
return iter_map_mangler(t, kmng, emng)
}
return nil
}
// loadReflectStruct ...
func loadReflectStruct(t reflect.Type) Mangler {
var mngs []Mangler
// Gather manglers for all fields.
for i := 0; i < t.NumField(); i++ {
field := t.Field(i)
// Load mangler for field type.
mng := load(nil, field.Type)
if mng == nil {
return nil
}
// Append next to map.
mngs = append(mngs, mng)
}
// Use manglers for nested iteration.
return iter_struct_mangler(t, mngs)
}
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