htmlentity.go

package strings

import (
	"fmt"
	"unicode/utf8"
)

func MultibyteToEntityString(in string) string {
	ret := ""
	for _, c := range in {
		if c < utf8.RuneSelf {
			ret = ret + string(c)
		} else {
			ret = ret + fmt.Sprintf("&#x%x;", c)
		}
	}
	return ret
}

htmlentity_test.go

package strings

import (
	"testing"
)

func TestConvert(t *testing.T) {
	tests := []struct {
		In  string
		Out string
	}{
		{
			In:  "a",
			Out: "a",
		}, {
			In:  "あい",
			Out: "あい",
		}, {
			In:  ">",
			Out: ">",
		},
	}
	for _, test := range tests {
		out := MultibyteToEntityString(test.In)
		if out != test.Out {
			t.Errorf("in: %s expected: %s but got: %s", test.In, test.Out, out)
		}
	}
}