Feature: Skip double formatting

README.md

@@ -302,13 +302,30 @@ One of `LATIN1`, `UTF_16_BE`, `UTF_16_LE`, `UTF_8`, `UTF_8_BOM`
 </td>
 <td>
 
-A [NumberFormat](https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/text/NumberFormat.html) that describes how `xsd:double` literals are formatted
+A [NumberFormat](https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/text/NumberFormat.html) that describes how `xsd:double` literals are formatted if `enableDoubleFormatting` is `true`.
 
 </td>
 <td>
 
 `0.####E0`
 
+</td>
+</tr>
+<tr>
+<td>
+
+`enableDoubleFormatting`
+
+</td>
+<td>
+
+Enables formatting of `xsd:double` values (see `doubleFormat` option)
+
+</td>
+<td>
+
+`false`
+
 </td>
 </tr>
 
@@ -691,6 +708,8 @@ elements in RDF lists.
 \* Adapted from [EditorConfig](https://editorconfig.org/#file-format-details)
 
 ## Release Notes
+* 1.2.13: 
+  * Feature: Skip double formatting
 * 1.2.12:
   * Bugfix: Handle RDF lists that start with a non-anonymous node
   * Bugfix: Handle blank node cycles

src/main/java/de/atextor/turtle/formatter/FormattingStyle.java

@@ -106,6 +106,9 @@ public class FormattingStyle {
     @Builder.Default
     public NumberFormat doubleFormat = new DecimalFormat("0.####E0" , DecimalFormatSymbols.getInstance(Locale.US));
 
+    @Builder.Default
+    public boolean enableDoubleFormatting = false;
+
     @Builder.Default
     public EndOfLineStyle endOfLine = EndOfLineStyle.LF;
 

src/main/java/de/atextor/turtle/formatter/TurtleFormatter.java

@@ -31,6 +31,9 @@
 import java.io.IOException;
 import java.io.OutputStream;
 import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.Arrays;
 import java.util.Comparator;
 import java.util.HashMap;
 import java.util.HashSet;
@@ -622,26 +625,31 @@ private State writeUriResource( final Resource resource, final State state ) {
     }
 
     private State writeLiteral( final Literal literal, final State state ) {
-        if ( literal.getDatatypeURI().equals( XSD.xboolean.getURI() ) ) {
-            return state.write( literal.getBoolean() ? "true" : "false" );
+        String datatypeUri = literal.getDatatypeURI();
+        if (datatypeUri.equals(XSD.xdouble.getURI())) {
+            if (style.enableDoubleFormatting){
+                return state.write(style.doubleFormat.format(literal.getDouble()));
+            } else {
+                return state.write(literal.getLexicalForm());
+            }
         }
-        if ( literal.getDatatypeURI().equals( XSD.xstring.getURI() ) ) {
-            return state.write( quoteAndEscape( literal ) );
+        if (datatypeUri.equals(XSD.xboolean.getURI())) {
+            return state.write(literal.getBoolean() ? "true" : "false");
         }
-        if ( literal.getDatatypeURI().equals( XSD.decimal.getURI() ) ) {
-            return state.write( literal.getLexicalForm() );
+        if (datatypeUri.equals(XSD.xstring.getURI())) {
+            return state.write(quoteAndEscape(literal));
         }
-        if ( literal.getDatatypeURI().equals( XSD.integer.getURI() ) ) {
-            return state.write( literal.getValue().toString() );
+        if (datatypeUri.equals(XSD.decimal.getURI())) {
+            return state.write(literal.getLexicalForm());
         }
-        if ( literal.getDatatypeURI().equals( XSD.xdouble.getURI() ) ) {
-            return state.write( style.doubleFormat.format( literal.getDouble() ) );
+        if (datatypeUri.equals(XSD.integer.getURI())) {
+            return state.write(literal.getValue().toString());
         }
-        if ( literal.getDatatypeURI().equals( RDF.langString.getURI() ) ) {
-            return state.write( quoteAndEscape( literal ) + "@" + literal.getLanguage() );
+        if (datatypeUri.equals(RDF.langString.getURI())) {
+            return state.write(quoteAndEscape(literal) + "@" + literal.getLanguage());
         }
 
-        final Resource typeResource = ResourceFactory.createResource( literal.getDatatypeURI() );
+        final Resource typeResource = ResourceFactory.createResource( datatypeUri );
         final State literalWritten = state.write( quoteAndEscape( literal ) + "^^" );
         return writeUriResource( typeResource, literalWritten );
     }

src/test/java/de/atextor/turtle/formatter/TurtleFormatterTest.java

@@ -1,25 +1,12 @@
 package de.atextor.turtle.formatter;
 
-import org.apache.jena.atlas.io.AWriter;
-import org.apache.jena.atlas.io.IO;
-import org.apache.jena.graph.Graph;
 import org.apache.jena.rdf.model.Model;
 import org.apache.jena.rdf.model.ModelFactory;
 import org.apache.jena.rdf.model.Property;
 import org.apache.jena.rdf.model.RDFNode;
 import org.apache.jena.rdf.model.Resource;
 import org.apache.jena.rdf.model.Statement;
-import org.apache.jena.riot.Lang;
-import org.apache.jena.riot.RDFParser;
-import org.apache.jena.riot.lang.LabelToNode;
-import org.apache.jena.riot.out.NodeFormatter;
-import org.apache.jena.riot.out.NodeFormatterNT;
-import org.apache.jena.riot.system.StreamRDF;
-import org.apache.jena.riot.system.StreamRDFOps;
-import org.apache.jena.riot.writer.StreamWriterTriX;
-import org.apache.jena.riot.writer.WriterStreamRDFPlain;
 import org.apache.jena.vocabulary.RDF;
-import org.junit.jupiter.api.Disabled;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.params.ParameterizedTest;
 import org.junit.jupiter.params.provider.Arguments;
@@ -28,7 +15,6 @@
 import java.io.ByteArrayInputStream;
 import java.io.ByteArrayOutputStream;
 import java.io.InputStream;
-import java.io.StringWriter;
 import java.nio.charset.StandardCharsets;
 import java.util.List;
 import java.util.Map;
@@ -1032,6 +1018,54 @@ void testBlankNodeTriangleWithBlankNodeTriple(){
         }
     }
 
+    @Test
+    public void testEnableDoubleFormatting() {
+        final String modelString = """
+                       @prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
+                       @prefix ex: <http://example.com/ns#> .
+
+                       ex:something ex:decimalProp 0.0000000006241509074460762607776240980930446 ;
+                         ex:doubleProp 6.241509074460762607776240980930446E-10 .""";
+
+        final FormattingStyle style = FormattingStyle.builder().enableDoubleFormatting(false).build();
+
+        final TurtleFormatter formatter = new TurtleFormatter( style );
+        final String result = formatter.applyToContent( modelString );
+        assertThat(result.trim()).isEqualTo(modelString);
+    }
+
+    @Test
+    public void testDoubleFormattingDefault() {
+        final String modelString = """
+                       @prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
+                       @prefix ex: <http://example.com/ns#> .
+
+                       ex:something ex:decimalProp 0.0000000006241509074460762607776240980930446 ;
+                         ex:doubleProp 6.241509074460762607776240980930446E-10 .""";
+
+        final FormattingStyle style = FormattingStyle.builder().build();
+
+        final TurtleFormatter formatter = new TurtleFormatter( style );
+        final String result = formatter.applyToContent( modelString );
+        assertThat(result.trim()).isEqualTo(modelString);
+    }
+
+    @Test
+    public void testDisableDoubleFormatting() {
+        final String modelString = """
+                       @prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
+                       @prefix ex: <http://example.com/ns#> .
+
+                       ex:something ex:decimalProp 0.0000000006241509074460762607776240980930446 ;
+                         ex:doubleProp 6.2415E-10 .""";
+
+        final FormattingStyle style = FormattingStyle.builder().enableDoubleFormatting(true).build();
+
+        final TurtleFormatter formatter = new TurtleFormatter( style );
+        final String result = formatter.applyToContent( modelString );
+        assertThat(result.trim()).isEqualTo(modelString);
+    }
+
     private Model modelFromString( final String content ) {
         final Model model = ModelFactory.createDefaultModel();
         final InputStream stream = new ByteArrayInputStream( content.getBytes( StandardCharsets.UTF_8 ) );
@@ -1047,4 +1081,6 @@ private Model prefixModel() {
         model.setNsPrefix( "abcdef", "http://example.com/abc" );
         return model;
     }
+
+
 }