optimizations

internal/parser/parser_test.go

@@ -126,6 +126,37 @@ func TestIntegerLiteralExpression(t *testing.T) {
 	}
 }
 
+func TestFloatLiteralExpression(t *testing.T) {
+	input := "2.5;"
+
+	l := lexer.New(input)
+	p := New("<test>", l)
+	program := p.ParseProgram()
+	checkParserErrors(t, p)
+
+	if len(program.Statements) != 1 {
+		t.Fatalf("program has not enough statements. got=%d",
+			len(program.Statements))
+	}
+	stmt, ok := program.Statements[0].(*ast.ExpressionStatement)
+	if !ok {
+		t.Fatalf("program.Statements[0] is not ast.ExpressionStatement. got=%T",
+			program.Statements[0])
+	}
+
+	literal, ok := stmt.Expression.(*ast.FloatLiteral)
+	if !ok {
+		t.Fatalf("exp not *ast.FloatLiteral. got=%T", stmt.Expression)
+	}
+	if literal.Value != 2.5 {
+		t.Errorf("literal.Value not %f. got=%f", 2.5, literal.Value)
+	}
+	if literal.TokenLiteral() != "2.5" {
+		t.Errorf("literal.TokenLiteral not %s. got=%s", "2.5",
+			literal.TokenLiteral())
+	}
+}
+
 func TestParsingPrefixExpressions(t *testing.T) {
 	prefixTests := []struct {
 		input    string