字符builder

go.mod

@@ -1,6 +1,6 @@
 module github.com/fthvgb1/wp-go
 
-go 1.19
+go 1.20
 
 require (
 	github.com/dlclark/regexp2 v1.7.0

helper/strings/strings.go

@@ -2,6 +2,7 @@ package strings
 
 import (
 	"crypto/md5"
+	"errors"
 	"fmt"
 	"golang.org/x/exp/constraints"
 	"io"
@@ -41,3 +42,35 @@ func Md5(str string) string {
 	}
 	return fmt.Sprintf("%x", h.Sum(nil))
 }
+
+func BuilderJoin(s *strings.Builder, str ...string) {
+	for _, ss := range str {
+		s.WriteString(ss)
+	}
+}
+
+func BuilderFormat(s *strings.Builder, format string, args ...any) {
+	s.WriteString(fmt.Sprintf(format, args...))
+}
+
+type Builder struct {
+	*strings.Builder
+}
+
+func NewBuilder() *Builder {
+	return &Builder{&strings.Builder{}}
+}
+
+func (b *Builder) WriteString(s ...string) (count int, err error) {
+	for _, ss := range s {
+		i, er := b.Builder.WriteString(ss)
+		if er != nil {
+			err = errors.Join(er)
+		}
+		count += i
+	}
+	return
+}
+func (b *Builder) Sprintf(format string, a ...any) (int, error) {
+	return b.WriteString(fmt.Sprintf(format, a...))
+}

helper/strings/strings_test.go

@@ -1,7 +1,9 @@
 package strings
 
 import (
+	"fmt"
 	"golang.org/x/exp/constraints"
+	"strings"
 	"testing"
 )
 
@@ -53,3 +55,46 @@ func TestToInteger(t *testing.T) {
 		})
 	}
 }
+
+func TestBuilder_WriteString(t *testing.T) {
+	type fields struct {
+		Builder *strings.Builder
+	}
+	type args struct {
+		s []string
+	}
+	//s :=NewBuilder()
+	tests := []struct {
+		name      string
+		fields    fields
+		args      args
+		wantCount int
+		wantErr   bool
+	}{
+		{
+			name: "t1",
+			fields: fields{
+				Builder: &strings.Builder{},
+			},
+			args:      args{s: []string{"11", "22", "不"}},
+			wantErr:   false,
+			wantCount: 7,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			b := &Builder{
+				Builder: tt.fields.Builder,
+			}
+			gotCount, err := b.WriteString(tt.args.s...)
+			if (err != nil) != tt.wantErr {
+				t.Errorf("WriteString() error = %v, wantErr %v", err, tt.wantErr)
+				return
+			}
+			if gotCount != tt.wantCount {
+				t.Errorf("WriteString() gotCount = %v, want %v", gotCount, tt.wantCount)
+			}
+			fmt.Println(b.String())
+		})
+	}
+}