SourceLocator: Start line numbers with 1.

Author: Werner Randelshofer

org.jhotdraw8.css/src/main/java/org.jhotdraw8.css/org/jhotdraw8/css/ast/SourceLocator.java

@@ -13,7 +13,7 @@
  * Indicates the position of a node in a source file, intended primarily for error reporting.
  *
  * @param characterOffset the character offset or -1 if unknown
- * @param lineNumber      the line number or -1 if unknown
+ * @param lineNumber      the line number or -1 if unknown. A file starts with line number 1 (not with 0).
  * @param uri             the source file URI or null if unknown
  */
 public record SourceLocator(int characterOffset, int lineNumber,

org.jhotdraw8.css/src/main/java/org.jhotdraw8.css/org/jhotdraw8/css/ast/Stylesheet.java

@@ -28,7 +28,7 @@ public class Stylesheet extends AbstractSyntaxTree {
     private final ImmutableList<StyleRule> styleRules;
 
     public Stylesheet(@Nullable URI uri, List<Rule> rules) {
-        super(new SourceLocator(0, 0, uri));
+        super(new SourceLocator(0, 1, uri));
         this.uri = uri;
         this.rules = VectorList.copyOf(rules);
         this.styleRules = VectorList.copyOf(

org.jhotdraw8.css/src/main/java/org.jhotdraw8.css/org/jhotdraw8/css/parser/AbstractCssScanner.java

@@ -14,8 +14,9 @@ public abstract class AbstractCssScanner implements CssScanner {
     protected long position;
     /**
      * The current line number in the input stream.
+     * An input stream starts with line number 1.
      */
-    protected long lineNumber;
+    protected long lineNumber = 1;
 
     /**
      * The current character.