From f02ef2760c05976eef80c0bf0e866a5778e877d6 Mon Sep 17 00:00:00 2001
From: Meng Zhuo <mzh@golangcn.org>
Date: Mon, 11 Mar 2024 14:48:40 +0800
Subject: [PATCH] set nya as 0

---
 .gitignore    | 1 +
 README.md     | 2 +-
 elementary.go | 3 +++
 eval.go       | 4 ++++
 4 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/.gitignore b/.gitignore
index 1853290..900d03c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -14,3 +14,4 @@
 
 # Dependency directories (remove the comment below to include it)
 # vendor/
+main.wasm
diff --git a/README.md b/README.md
index 57bfb21..8642175 100644
--- a/README.md
+++ b/README.md
@@ -55,7 +55,7 @@ sada
 
 * `da` True in boolean
 * `nye` False in boolean
-* `nya` null, nil
+* `nya` null, nil, 0
 * `unu` one, 1
 * `du` two, 2
 * `unudu` three, 3
diff --git a/elementary.go b/elementary.go
index f796c97..46322bb 100644
--- a/elementary.go
+++ b/elementary.go
@@ -94,6 +94,9 @@ func truthExpr(t bool) *Expr {
 }
 
 func (c *Context) getNumber(expr *Expr) int {
+	if expr.isNya() {
+		return 0
+	}
 	if !expr.isNumber() {
 		errorf("expect number; got %v", expr)
 	}
diff --git a/eval.go b/eval.go
index 49a3829..0729035 100644
--- a/eval.go
+++ b/eval.go
@@ -344,6 +344,10 @@ func (e *Expr) isTrue() bool {
 	return e != nil && e.sada == tokDa
 }
 
+func (e *Expr) isNya() bool {
+	return e == nil || e.sada == tokNya
+}
+
 func (e *Expr) length() int {
 	if e == nil {
 		return 0