86 lines
2.5 KiB
Go
86 lines
2.5 KiB
Go
|
package raymond
|
||
|
|
|
||
|
|
import (
|
||
|
|
"path"
|
||
|
|
"reflect"
|
||
|
|
)
|
||
|
|
|
||
|
|
// indirect returns the item at the end of indirection, and a bool to indicate if it's nil.
|
||
|
|
// We indirect through pointers and empty interfaces (only) because
|
||
|
|
// non-empty interfaces have methods we might need.
|
||
|
|
//
|
||
|
|
// NOTE: borrowed from https://github.com/golang/go/tree/master/src/text/template/exec.go
|
||
|
|
func indirect(v reflect.Value) (rv reflect.Value, isNil bool) {
|
||
|
|
for ; v.Kind() == reflect.Ptr || v.Kind() == reflect.Interface; v = v.Elem() {
|
||
|
|
if v.IsNil() {
|
||
|
|
return v, true
|
||
|
|
}
|
||
|
|
if v.Kind() == reflect.Interface && v.NumMethod() > 0 {
|
||
|
|
break
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return v, false
|
||
|
|
}
|
||
|
|
|
||
|
|
// IsTrue returns true if obj is a truthy value.
|
||
|
|
func IsTrue(obj interface{}) bool {
|
||
|
|
thruth, ok := isTrueValue(reflect.ValueOf(obj))
|
||
|
|
if !ok {
|
||
|
|
return false
|
||
|
|
}
|
||
|
|
return thruth
|
||
|
|
}
|
||
|
|
|
||
|
|
// isTrueValue reports whether the value is 'true', in the sense of not the zero of its type,
|
||
|
|
// and whether the value has a meaningful truth value
|
||
|
|
//
|
||
|
|
// NOTE: borrowed from https://github.com/golang/go/tree/master/src/text/template/exec.go
|
||
|
|
func isTrueValue(val reflect.Value) (truth, ok bool) {
|
||
|
|
if !val.IsValid() {
|
||
|
|
// Something like var x interface{}, never set. It's a form of nil.
|
||
|
|
return false, true
|
||
|
|
}
|
||
|
|
switch val.Kind() {
|
||
|
|
case reflect.Array, reflect.Map, reflect.Slice, reflect.String:
|
||
|
|
truth = val.Len() > 0
|
||
|
|
case reflect.Bool:
|
||
|
|
truth = val.Bool()
|
||
|
|
case reflect.Complex64, reflect.Complex128:
|
||
|
|
truth = val.Complex() != 0
|
||
|
|
case reflect.Chan, reflect.Func, reflect.Ptr, reflect.Interface:
|
||
|
|
truth = !val.IsNil()
|
||
|
|
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
|
||
|
|
truth = val.Int() != 0
|
||
|
|
case reflect.Float32, reflect.Float64:
|
||
|
|
truth = val.Float() != 0
|
||
|
|
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
|
||
|
|
truth = val.Uint() != 0
|
||
|
|
case reflect.Struct:
|
||
|
|
truth = true // Struct values are always true.
|
||
|
|
default:
|
||
|
|
return
|
||
|
|
}
|
||
|
|
return truth, true
|
||
|
|
}
|
||
|
|
|
||
|
|
// canBeNil reports whether an untyped nil can be assigned to the type. See reflect.Zero.
|
||
|
|
//
|
||
|
|
// NOTE: borrowed from https://github.com/golang/go/tree/master/src/text/template/exec.go
|
||
|
|
func canBeNil(typ reflect.Type) bool {
|
||
|
|
switch typ.Kind() {
|
||
|
|
case reflect.Chan, reflect.Func, reflect.Interface, reflect.Map, reflect.Ptr, reflect.Slice:
|
||
|
|
return true
|
||
|
|
}
|
||
|
|
return false
|
||
|
|
}
|
||
|
|
|
||
|
|
// fileBase returns base file name
|
||
|
|
//
|
||
|
|
// example: /foo/bar/baz.png => baz
|
||
|
|
func fileBase(filePath string) string {
|
||
|
|
fileName := path.Base(filePath)
|
||
|
|
fileExt := path.Ext(filePath)
|
||
|
|
|
||
|
|
return fileName[:len(fileName)-len(fileExt)]
|
||
|
|
}
|