BasicParser now uses string_view

src/coders/xml.cpp

@@ -177,7 +177,7 @@ const std::string& Document::getEncoding() const {
     return encoding;
 }
 
-Parser::Parser(const std::string& filename, const std::string& source) 
+Parser::Parser(std::string_view filename, std::string_view source) 
     : BasicParser(filename, source) {
 }
 
@@ -250,7 +250,7 @@ std::string Parser::parseText() {
         }
         nextChar();
     }
-    return source.substr(start, pos-start);
+    return std::string(source.substr(start, pos-start));
 }
 
 inline bool is_xml_identifier_start(char c) {
@@ -270,7 +270,7 @@ std::string Parser::parseXMLName() {
     while (hasNext() && is_xml_identifier_part(source[pos])) {
         pos++;
     }
-    return source.substr(start, pos-start);
+    return std::string(source.substr(start, pos-start));
 }
 
 xmlelement Parser::parseElement() {