feat: add writer

writer_test.go

@@ -0,0 +1,36 @@
+package spb
+
+import (
+	"bufio"
+	"bytes"
+	"os"
+	"strings"
+	"testing"
+)
+
+func TestWriter(t *testing.T) {
+	f := bytes.NewBuffer(make([]byte, 0, 65536))
+	ft, err := os.Open("dict.txt")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer ft.Close()
+	sc := bufio.NewScanner(ft)
+	for sc.Scan() {
+		c := Constructor{}
+		for _, s := range strings.Split(sc.Text(), "\t") {
+			err = c.WriteString(s, 127)
+			if err != nil {
+				t.Fatal(err)
+			}
+		}
+		c.WriteTo(f)
+	}
+	real, err := os.ReadFile("dict.sp")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !bytes.Equal(real, f.Bytes()) {
+		t.Fail()
+	}
+}