copy a modified method from a standard library

Author: artur-chopikian

cell.go

@@ -512,7 +512,7 @@ func trimCellValue(value string, escape bool) (v string, ns xml.Attr) {
 	}
 	if escape && value != "" {
 		var buf bytes.Buffer
-		_ = xml.EscapeText(&buf, []byte(value))
+		_ = escapeText(&buf, []byte(value))
 		value = buf.String()
 	}
 	if value != "" {

xml.go

@@ -0,0 +1,77 @@
+package excelize
+
+// ---------------------------------------------------------
+// INFO: THIS FILE IS COPIED FROM THE STANDARD LIBRARY
+// REASON: to solve the problem with 'xml:space="preserve"' when value ends with '\n' and it replaces it with '&#xA';
+// ---------------------------------------------------------
+
+import (
+	"io"
+	"unicode/utf8"
+)
+
+var (
+	escQuot = []byte(""") // shorter than """
+	escApos = []byte("'") // shorter than "'"
+	escAmp  = []byte("&")
+	escLT   = []byte("<")
+	escGT   = []byte(">")
+	escTab  = []byte("	")
+	escCR   = []byte("
")
+	escFFFD = []byte("\uFFFD") // Unicode replacement character
+)
+
+// escapeText writes to w the properly escaped XML equivalent
+// of the plain text data s. If escapeNewline is true, newline
+// characters will be escaped.
+func escapeText(w io.Writer, s []byte) error {
+	var esc []byte
+	last := 0
+	for i := 0; i < len(s); {
+		r, width := utf8.DecodeRune(s[i:])
+		i += width
+		switch r {
+		case '"':
+			esc = escQuot
+		case '\'':
+			esc = escApos
+		case '&':
+			esc = escAmp
+		case '<':
+			esc = escLT
+		case '>':
+			esc = escGT
+		case '\t':
+			esc = escTab
+		case '\r':
+			esc = escCR
+		default:
+			if !isInCharacterRange(r) || (r == 0xFFFD && width == 1) {
+				esc = escFFFD
+				break
+			}
+			continue
+		}
+		if _, err := w.Write(s[last : i-width]); err != nil {
+			return err
+		}
+		if _, err := w.Write(esc); err != nil {
+			return err
+		}
+		last = i
+	}
+	_, err := w.Write(s[last:])
+	return err
+}
+
+// Decide whether the given rune is in the XML Character Range, per
+// the Char production of https://www.xml.com/axml/testaxml.htm,
+// Section 2.2 Characters.
+func isInCharacterRange(r rune) (inRange bool) {
+	return r == 0x09 ||
+		r == 0x0A ||
+		r == 0x0D ||
+		r >= 0x20 && r <= 0xD7FF ||
+		r >= 0xE000 && r <= 0xFFFD ||
+		r >= 0x10000 && r <= 0x10FFFF
+}