xml.go

// Copyright 2017 FoxyUtils ehf. All rights reserved.
//
// Use of this software package and source code is governed by the terms of the
// UniDoc End User License Agreement (EULA) that is available at:
// https://unidoc.io/eula/
// A trial license code for evaluation can be obtained at https://unidoc.io.

package unioffice

import "encoding/xml"

// NeedsSpacePreserve returns true if the string has leading or trailing space.
func NeedsSpacePreserve(s string) bool {
	if len(s) == 0 {
		return false
	}
	switch s[0] {
	case '\t', '\n', '\v', '\f', '\r', ' ', 0x85, 0xA0:
		return true
	}
	switch s[len(s)-1] {
	case '\t', '\n', '\v', '\f', '\r', ' ', 0x85, 0xA0:
		return true
	}
	return false
}

// AddPreserveSpaceAttr adds an xml:space="preserve" attribute to a start
// element if it is required for the string s.
func AddPreserveSpaceAttr(se *xml.StartElement, s string) {
	if NeedsSpacePreserve(s) {
		se.Attr = append(se.Attr, xml.Attr{Name: xml.Name{Local: "xml:space"}, Value: "preserve"})
	}
}