feat(#3706): add a few more puzzles

eo-parser/src/main/java/org/eolang/parser/ParsingErrors.java

@@ -30,7 +30,6 @@
 import java.util.Optional;
 import org.antlr.v4.runtime.BaseErrorListener;
 import org.antlr.v4.runtime.InputMismatchException;
-import org.antlr.v4.runtime.LexerNoViableAltException;
 import org.antlr.v4.runtime.NoViableAltException;
 import org.antlr.v4.runtime.RecognitionException;
 import org.antlr.v4.runtime.Recognizer;
@@ -46,6 +45,10 @@
  * Accumulates all parsing errors.
  *
  * @since 0.30.0
+ * @todo #3706:30min Split {@link ParsingErrors} into two classes.
+ *  Currently we use the same {@link ParsingErrors} class to accumulate all the parsing errors
+ *  despite their origin. This class should be split into two classes: one for parsing errors
+ *  {@link ParserErrors} and another for lexer errors {@link LexerErrors}.
  */
 final class ParsingErrors extends BaseErrorListener implements Iterable<Directive> {
 
@@ -86,7 +89,7 @@ public void syntaxError(
         final String msg,
         final RecognitionException error
     ) {
-        if (error instanceof NoViableAltException) {
+        if (error instanceof NoViableAltException || error instanceof InputMismatchException) {
             final Token token = (Token) symbol;
             final EoParser parser = (EoParser) recognizer;
             final String rule = parser.getRuleInvocationStack().get(0);
@@ -96,6 +99,8 @@ public void syntaxError(
                 detailed = "Invalid object declaration";
             } else if (names[EoParser.RULE_metas].equals(rule)) {
                 detailed = "Invalid meta declaration";
+            } else if (names[EoParser.RULE_program].equals(rule)) {
+                detailed = "Invalid program declaration";
             } else {
                 detailed = "no viable alternative at input";
             }
@@ -116,12 +121,6 @@ public void syntaxError(
                     line
                 )
             );
-        } else if (error instanceof InputMismatchException) {
-            System.out.println(error);
-            //todo
-        } else if (error instanceof LexerNoViableAltException) {
-            System.out.println(error);
-            //todo
         } else if (Objects.isNull(error)) {
             this.errors.add(
                 new ParsingException(

eo-parser/src/test/resources/org/eolang/parser/eo-typos/empty-line-between-metas.yaml

@@ -21,6 +21,10 @@
 # SOFTWARE.
 ---
 line: 3
+message: |-
+  [3:0] error: Invalid object declaration:
+  +meta other
+  ^^^^^^^^^^
 input: |
   +meta smth
 

eo-parser/src/test/resources/org/eolang/parser/eo-typos/not-empty-atoms.yaml

@@ -21,6 +21,10 @@
 # SOFTWARE.
 ---
 line: 4
+message: |-
+  [4:-1] error: Invalid program declaration:
+    [] > inner
+  ^^^^^^^^^^^^
 input: |
   # No comments.
   [] > test /int

eo-parser/src/test/resources/org/eolang/parser/eo-typos/redundant-parentheses/simple-application-named.yaml

@@ -21,6 +21,10 @@
 # SOFTWARE.
 ---
 line: 3
+message: |-
+  [3:-1] error: Invalid program declaration:
+  EOF
+  ^^^
 input: |
   1.add 1 > x
     (1.add 1) > y

eo-parser/src/test/resources/org/eolang/parser/eo-typos/redundant-parentheses/simple-application.yaml

@@ -21,6 +21,15 @@
 # SOFTWARE.
 ---
 line: 3
+# @todo #3706:30min Unreadable error message if program declaration is invalid.
+#  Improve error message for the case when a program declaration is invalid.
+#  The error message should be more informative and should point to the exact
+#  place in the input where the error occurred. Moreover it should be clear
+#  what to do to fix the error. 'simple-application-named.yaml' has the same issue.
+message: |-
+  [3:-1] error: Invalid program declaration:
+  EOF
+  ^^^
 input: |
   1.add 1 > x
     (1.add 1)

eo-parser/src/test/resources/org/eolang/parser/eo-typos/vmethod-after-happlication.yaml

@@ -21,6 +21,10 @@
 # SOFTWARE.
 ---
 line: 2
+message: |-
+  [2:0] error: Invalid program declaration:
+  .z
+  ^
 input: |
   x y
   .z

eo-parser/src/test/resources/org/eolang/parser/eo-typos/vmethod-after-hmethod.yaml

@@ -21,6 +21,10 @@
 # SOFTWARE.
 ---
 line: 2
+message: |-
+  [2:0] error: Invalid program declaration:
+  .z
+  ^
 input: |
   x.y
   .z