add example for negative numbers

xiam · Feb 9, 2020 · c43bfc4 · c43bfc4
1 parent f2ec568
commit c43bfc4
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Showing 2 changed files with 16 additions and 0 deletions.
diff --git a/ast/node.go b/ast/node.go
@@ -150,3 +150,7 @@ func (n *Node) IsVector() bool {
 	}
 	return false
 }
+
+func (n *Node) Parent() *Node {
+	return n.p
+}
diff --git a/lexer/lexer_test.go b/lexer/lexer_test.go
@@ -10,6 +10,8 @@ func TestScanner(t *testing.T) {
 	testCases := []string{
 		`1`,
 
+		`-1 -2.22`,
+
 		`+ 1 1 1 1`,
 
 		`[ [ [] ] [] []]`,
@@ -132,6 +134,16 @@ func TestTokenize(t *testing.T) {
 				TokenEOF,
 			},
 		},
+		{
+			`-1.23`,
+			[]TokenType{
+				TokenSequence,
+				TokenInteger,
+				TokenSequence,
+				TokenInteger,
+				TokenEOF,
+			},
+		},
 		{
 			`(+
 			[1