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// SPDX-License-Identifier: MIT
// Copyright (c) 2026 Paul Buetow
package rpn
import (
"fmt"
)
// BooleanOperations provides boolean comparison operator implementations.
type BooleanOperations struct {
}
// NewBooleanOperations creates a new BooleanOperations instance.
func NewBooleanOperations() *BooleanOperations {
return &BooleanOperations{}
}
// GT pops two values from stack, compares (a > b), and pushes a boolean result.
func (o *BooleanOperations) GT(stack *Stack) error {
b, err := stack.Pop()
if err != nil {
return fmt.Errorf("insufficient operands for gt: %w", err)
}
a, err := stack.Pop()
if err != nil {
return fmt.Errorf("insufficient operands for gt: %w", err)
}
stack.Push(NewFloatFromBool(a.Float64() > b.Float64()))
return nil
}
// LT pops two values from stack, compares (a < b), and pushes a boolean result.
func (o *BooleanOperations) LT(stack *Stack) error {
b, err := stack.Pop()
if err != nil {
return fmt.Errorf("insufficient operands for lt: %w", err)
}
a, err := stack.Pop()
if err != nil {
return fmt.Errorf("insufficient operands for lt: %w", err)
}
stack.Push(NewFloatFromBool(a.Float64() < b.Float64()))
return nil
}
// GTE pops two values from stack, compares (a >= b), and pushes a boolean result.
func (o *BooleanOperations) GTE(stack *Stack) error {
b, err := stack.Pop()
if err != nil {
return fmt.Errorf("insufficient operands for gte: %w", err)
}
a, err := stack.Pop()
if err != nil {
return fmt.Errorf("insufficient operands for gte: %w", err)
}
stack.Push(NewFloatFromBool(a.Float64() >= b.Float64()))
return nil
}
// LTE pops two values from stack, compares (a <= b), and pushes a boolean result.
func (o *BooleanOperations) LTE(stack *Stack) error {
b, err := stack.Pop()
if err != nil {
return fmt.Errorf("insufficient operands for lte: %w", err)
}
a, err := stack.Pop()
if err != nil {
return fmt.Errorf("insufficient operands for lte: %w", err)
}
stack.Push(NewFloatFromBool(a.Float64() <= b.Float64()))
return nil
}
// EQ pops two values from stack, compares (a == b), and pushes a boolean result.
func (o *BooleanOperations) EQ(stack *Stack) error {
b, err := stack.Pop()
if err != nil {
return fmt.Errorf("insufficient operands for eq: %w", err)
}
a, err := stack.Pop()
if err != nil {
return fmt.Errorf("insufficient operands for eq: %w", err)
}
stack.Push(NewFloatFromBool(a.Float64() == b.Float64()))
return nil
}
// NEQ pops two values from stack, compares (a != b), and pushes a boolean result.
func (o *BooleanOperations) NEQ(stack *Stack) error {
b, err := stack.Pop()
if err != nil {
return fmt.Errorf("insufficient operands for neq: %w", err)
}
a, err := stack.Pop()
if err != nil {
return fmt.Errorf("insufficient operands for neq: %w", err)
}
stack.Push(NewFloatFromBool(a.Float64() != b.Float64()))
return nil
}
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