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53 lines
1.4 KiB
Go
53 lines
1.4 KiB
Go
package vars
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import (
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"reflect"
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"sync"
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"src.elv.sh/pkg/eval/vals"
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)
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type PtrVar struct {
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ptr any
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mutex *sync.RWMutex
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}
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// FromPtrWithMutex creates a variable from a pointer. The variable is kept in
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// sync with the value the pointer points to, converting with vals.ScanToGo and
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// vals.FromGo when Get and Set. Its access is guarded by the supplied mutex.
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func FromPtrWithMutex(p any, m *sync.RWMutex) PtrVar {
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return PtrVar{p, m}
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}
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// FromPtr creates a variable from a pointer. The variable is kept in sync with
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// the value the pointer points to, converting with vals.ScanToGo and
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// vals.FromGo when Get and Set. Its access is guarded by a new mutex.
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func FromPtr(p any) PtrVar {
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return FromPtrWithMutex(p, new(sync.RWMutex))
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}
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// FromInit creates a variable with an initial value. The variable created
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// can be assigned values of any type.
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func FromInit(v any) Var {
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return FromPtr(&v)
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}
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// Get returns the value pointed by the pointer, after conversion using FromGo.
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func (v PtrVar) Get() any {
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return vals.FromGo(v.GetRaw())
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}
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// GetRaw returns the value pointed by the pointer without any conversion.
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func (v PtrVar) GetRaw() any {
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v.mutex.RLock()
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defer v.mutex.RUnlock()
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return reflect.Indirect(reflect.ValueOf(v.ptr)).Interface()
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}
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// Set sets the value pointed by the pointer, after conversion using ScanToGo.
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func (v PtrVar) Set(val any) error {
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v.mutex.Lock()
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defer v.mutex.Unlock()
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return vals.ScanToGo(val, v.ptr)
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}
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