refactor(renderer): simplify rendering of special characters (#1070)

Signed-off-by: Xavier Coulon <[email protected]>

libasciidoc.go

@@ -52,11 +52,11 @@ func Convert(source io.Reader, output io.Writer, config *configuration.Configura
 	var start, endOfPreprocess, emdOfParse, endOfValidate, endOfRender time.Time
 	start = time.Now()
 	defer func() {
-		log.Debugf("time to preprocess %d microseconds", endOfPreprocess.Sub(start).Microseconds())
-		log.Debugf("time to parse      %d microseconds", emdOfParse.Sub(endOfPreprocess).Microseconds())
-		log.Debugf("time to validate   %d microseconds", endOfValidate.Sub(emdOfParse).Microseconds())
-		log.Debugf("time to render     %d microseconds", endOfRender.Sub(endOfValidate).Microseconds())
-		log.Debugf("total time         %d microseconds", endOfRender.Sub(start).Microseconds())
+		log.Infof("time to preprocess %d microseconds", endOfPreprocess.Sub(start).Microseconds())
+		log.Infof("time to parse      %d microseconds", emdOfParse.Sub(endOfPreprocess).Microseconds())
+		log.Infof("time to validate   %d microseconds", endOfValidate.Sub(emdOfParse).Microseconds())
+		log.Infof("time to render     %d microseconds", endOfRender.Sub(endOfValidate).Microseconds())
+		log.Infof("total time         %d microseconds", endOfRender.Sub(start).Microseconds())
 	}()
 	p, err := parser.Preprocess(source, config)
 	if err != nil {

pkg/renderer/sgml/special_character.go

@@ -1,10 +1,20 @@
 package sgml
 
 import (
+	"fmt"
+
 	"github.com/bytesparadise/libasciidoc/pkg/types"
 )
 
 func (r *sgmlRenderer) renderSpecialCharacter(s *types.SpecialCharacter) (string, error) {
-	// log.Debugf("rendering special character '%s'", s.Name)
-	return escapeString(s.Name), nil
+	switch s.Name {
+	case `&`:
+		return "&", nil
+	case `<`:
+		return "&lt;", nil
+	case `>`:
+		return "&gt;", nil
+	default:
+		return "", fmt.Errorf("unknown special character: '%s'", s.Name)
+	}
 }