Add constants lookup in rpn_parse.go handleOperator

- Added constants lookup after variable lookup in rpn_parse.go
- Now constants like pi, e, phi, sqrt2, inf, nan work in RPN expressions

1 files changed, 6 insertions, 0 deletions

diff --git a/internal/rpn/rpn_parse.go b/internal/rpn/rpn_parse.go
index 6659c57..45531bb 100644
--- a/internal/rpn/rpn_parse.go
+++ b/internal/rpn/rpn_parse.go
@@ -465,6 +465,12 @@ func (r *RPN) handleOperator(stack *Stack, token string, tokenIndex int) (string
 		stack.Push(NewNumber(val, r.mode))
 		return "", nil
 	}
+	// Check if it's a constant reference (before operators)
+	if val, exists := r.consts.GetConstant(token); exists {
+		stack.Push(NewNumber(val, r.mode))
+		return "", nil
+	}
+
 
 	// Handle standard operators (common logic extracted for DRY)
 	// This must be done BEFORE pushing Symbol for unknown identifiers,