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// SPDX-License-Identifier: MIT
// Copyright (c) 2026 Paul Buetow
package rpn
import (
"fmt"
)
// VariableOperations provides variable management operator implementations.
type VariableOperations struct {
vars VariableStore
}
// NewVariableOperations creates a new VariableOperations instance.
func NewVariableOperations(vars VariableStore) *VariableOperations {
return &VariableOperations{vars: vars}
}
// AssignVariable assigns a value from the stack to a variable.
// Usage: `name value =`
func (o *VariableOperations) AssignVariable(stack *Stack, name string) error {
val, err := stack.Pop()
if err != nil {
return err
}
// Convert Number to float64 for variable storage
valF, err := val.Float64()
if err != nil {
return fmt.Errorf("failed to get float64 value for variable: %w", err)
}
return o.vars.SetVariable(name, valF)
}
// UseVariable pushes a variable's value onto the stack.
// Usage: `varname` (pushes stored value)
func (o *VariableOperations) UseVariable(stack *Stack, name string) error {
if name == "" {
return fmt.Errorf("variable name cannot be empty")
}
val, exists := o.vars.GetVariable(name)
if !exists {
return fmt.Errorf("%w: %s", ErrVariableNotFound, name)
}
stack.Push(NewNumber(val, FloatMode))
return nil
}
// DeleteVariable removes a variable.
// Usage: `name d`
func (o *VariableOperations) DeleteVariable(name string) error {
if name == "" {
return fmt.Errorf("variable name cannot be empty")
}
deleted := o.vars.DeleteVariable(name)
if !deleted {
return fmt.Errorf("%w: %s", ErrVariableNotFound, name)
}
return nil
}
// ListVariables returns a string listing all variables.
// Usage: `vars`
func (o *VariableOperations) ListVariables() (string, error) {
return o.vars.FormatVariables(), nil
}
// ClearVariables removes all variables.
// Usage: `clear`
func (o *VariableOperations) ClearVariables() {
o.vars.ClearVariables()
}
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