fix(#3073): removed explicit copying from EO

eo-maven-plugin/src/main/resources/org/eolang/maven/phi/to-phi.xsl

@@ -288,10 +288,6 @@ SOFTWARE.
             <xsl:value-of select="eo:specials(@base, false())"/>
           </xsl:otherwise>
         </xsl:choose>
-        <!-- Copy -->
-        <xsl:if test="@copy">
-          <xsl:text>()</xsl:text>
-        </xsl:if>
         <!-- Nested objects -->
         <xsl:if test="count(o)&gt;0">
           <xsl:text>(</xsl:text>
@@ -313,10 +309,6 @@ SOFTWARE.
           <xsl:with-param name="package" select="$package"/>
         </xsl:apply-templates>
         <xsl:value-of select="eo:specials(@base, true())"/>
-        <!-- Copy -->
-        <xsl:if test="@copy">
-          <xsl:text>()</xsl:text>
-        </xsl:if>
         <!-- Nested objects -->
         <xsl:if test="count(o)&gt;1">
           <xsl:text>(</xsl:text>

eo-maven-plugin/src/main/resources/org/eolang/maven/pre/to-java.xsl

@@ -380,10 +380,6 @@ SOFTWARE.
       <xsl:with-param name="indent" select="$indent"/>
       <xsl:with-param name="rho" select="$rho"/>
     </xsl:apply-templates>
-    <xsl:apply-templates select=".[@copy]" mode="copy">
-      <xsl:with-param name="name" select="$name"/>
-      <xsl:with-param name="indent" select="$indent"/>
-    </xsl:apply-templates>
     <xsl:apply-templates select="." mode="located">
       <xsl:with-param name="name" select="$name"/>
       <xsl:with-param name="indent" select="$indent"/>
@@ -434,22 +430,6 @@ SOFTWARE.
       <xsl:with-param name="skip" select="1"/>
       <xsl:with-param name="rho" select="$rho"/>
     </xsl:apply-templates>
-    <xsl:apply-templates select=".[@copy]" mode="copy">
-      <xsl:with-param name="name" select="$name"/>
-      <xsl:with-param name="indent" select="$indent"/>
-    </xsl:apply-templates>
-  </xsl:template>
-  <!-- Empty application  -->
-  <xsl:template match="o[@copy]" mode="copy">
-    <xsl:param name="indent"/>
-    <xsl:param name="name"/>
-    <xsl:value-of select="$indent"/>
-    <xsl:value-of select="eo:tabs(1)"/>
-    <xsl:value-of select="$name"/>
-    <xsl:text> = new PhCopy(</xsl:text>
-    <xsl:value-of select="$name"/>
-    <xsl:text>);</xsl:text>
-    <xsl:value-of select="eo:eol(0)"/>
   </xsl:template>
   <!-- Location of object -->
   <xsl:template match="*" mode="located">

eo-maven-plugin/src/test/resources/org/eolang/maven/phi/yaml/empty.yaml

@@ -3,14 +3,14 @@ eo: |
   [z] > main
     # This is the default 64+ symbols comment in front of named abstract object.
     [] > x
-    seq' > y
+    seq > y
 phi: |
   {
     ⟦
       main ↦ ⟦
         z ↦ ∅,
         x ↦ ⟦⟧,
-        y ↦ Φ.org.eolang.seq()
+        y ↦ Φ.org.eolang.seq
       ⟧
     ⟧
   }

eo-parser/src/main/antlr4/org/eolang/parser/Eo.g4

@@ -59,8 +59,7 @@ master
     ;
 
 // Just an object reference without name
-just: beginner
-    | finisherCopied
+just: beginnerOrFinisher
     | versioned
     ;
 
@@ -160,7 +159,8 @@ happlicationHeadExtended
 // Simple statements that can be used as head of application
 applicable
     : STAR
-    | (NAME | AT) COPY?
+    | NAME
+    | PHI
     ;
 
 // Horizontal application tail
@@ -182,8 +182,7 @@ happlicationTailReversedFirst
 // Argument of horizontal application
 // Does not contain elements in vertical notation
 happlicationArg
-    : beginner
-    | finisherCopied
+    : beginnerOrFinisher
     | hmethod
     | scope
     ;
@@ -391,15 +390,13 @@ hmethodExtendedVersioned
 
 // Head of horizontal method
 hmethodHead
-    : beginner
-    | finisherCopied
+    : beginnerOrFinisher
     | scope
     ;
 
 // Extended head of horizontal method
 hmethodHeadExtended
-    : beginner
-    | finisherCopied
+    : beginnerOrFinisher
     | scope
     ;
 
@@ -454,7 +451,7 @@ vmethodHeadVapplication
 
 // Tail of method
 methodTail
-    : DOT finisherCopied
+    : DOT finisher
     ;
 
 // Versioned tail of method
@@ -475,14 +472,15 @@ beginner
 // Can start or finish the statement
 finisher
     : NAME
-    | AT
+    | PHI
     | RHO
     | SIGMA
     ;
 
-// Finisher with optional COPY
-finisherCopied
-    : finisher COPY?
+// Beginner or finisher
+beginnerOrFinisher
+    : beginner
+    | finisher
     ;
 
 // Name with optional version
@@ -503,7 +501,7 @@ oname
 
 // Suffix
 suffix
-    : SPACE ARROW SPACE (AT | NAME)
+    : SPACE ARROW SPACE (PHI | NAME)
     ;
 
 // Simple scope
@@ -554,8 +552,6 @@ SLASH
 COLON
     : ':'
     ;
-COPY: '\''
-    ;
 ARROW
     : '>'
     ;
@@ -585,7 +581,7 @@ LB  : '('
     ;
 RB  : ')'
     ;
-AT  : '@'
+PHI : '@'
     ;
 RHO : '^'
     ;

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

@@ -496,17 +496,14 @@ public void enterApplicable(final EoParser.ApplicableContext ctx) {
             this.objects.prop("star");
         } else if (ctx.NAME() != null) {
             base = ctx.NAME().getText();
-        } else if (ctx.AT() != null) {
+        } else if (ctx.PHI() != null) {
             base = "@";
         } else {
             base = "";
         }
         if (!base.isEmpty()) {
             this.objects.prop("base", base);
         }
-        if (ctx.COPY() != null) {
-            this.objects.prop("copy");
-        }
         this.objects.leave();
     }
 
@@ -1068,7 +1065,7 @@ public void enterFinisher(final EoParser.FinisherContext ctx) {
         final String base;
         if (ctx.NAME() != null) {
             base = ctx.NAME().getText();
-        } else if (ctx.AT() != null) {
+        } else if (ctx.PHI() != null) {
             base = "@";
         } else if (ctx.RHO() != null) {
             base = "^";
@@ -1088,15 +1085,13 @@ public void exitFinisher(final EoParser.FinisherContext ctx) {
     }
 
     @Override
-    public void enterFinisherCopied(final EoParser.FinisherCopiedContext ctx) {
+    public void enterBeginnerOrFinisher(final EoParser.BeginnerOrFinisherContext ctx) {
         // Nothing here
     }
 
     @Override
-    public void exitFinisherCopied(final EoParser.FinisherCopiedContext ctx) {
-        if (ctx.COPY() != null) {
-            this.objects.enter().prop("copy").leave();
-        }
+    public void exitBeginnerOrFinisher(final EoParser.BeginnerOrFinisherContext ctx) {
+        // Nothing here
     }
 
     @Override
@@ -1135,8 +1130,8 @@ public void exitOname(final EoParser.OnameContext ctx) {
     @SuppressWarnings("PMD.ConfusingTernary")
     public void enterSuffix(final EoParser.SuffixContext ctx) {
         this.objects.enter();
-        if (ctx.AT() != null) {
-            this.objects.prop("name", ctx.AT().getText());
+        if (ctx.PHI() != null) {
+            this.objects.prop("name", ctx.PHI().getText());
         } else if (ctx.NAME() != null) {
             this.objects.prop("name", ctx.NAME().getText());
         }

eo-parser/src/main/resources/XMIR.xsd

@@ -56,7 +56,6 @@ SOFTWARE.
     <xs:attribute name="abstract" type="empty"/>
     <xs:attribute name="method" type="empty"/>
     <xs:attribute name="const" type="empty"/>
-    <xs:attribute name="copy" type="empty"/>
   </xs:complexType>
   <xs:complexType name="program">
     <xs:sequence>

eo-parser/src/main/resources/org/eolang/parser/xmir-to-eo-reversed.xsl

@@ -121,11 +121,8 @@ SOFTWARE.
     </xsl:for-each>
     <xsl:text>]</xsl:text>
   </xsl:template>
-  <!-- TAIL: SUFFIX, NAME, CONST, COPY, ATOM -->
+  <!-- TAIL: SUFFIX, NAME, CONST, ATOM -->
   <xsl:template match="o" mode="tail">
-    <xsl:if test="@copy">
-      <xsl:text>'</xsl:text>
-    </xsl:if>
     <xsl:if test="@as">
       <xsl:text>:</xsl:text>
       <xsl:value-of select="@as"/>

eo-parser/src/main/resources/org/eolang/parser/xmir-to-eo.xsl

@@ -137,11 +137,8 @@ SOFTWARE.
     </xsl:for-each>
     <xsl:text>]</xsl:text>
   </xsl:template>
-  <!-- TAIL: SUFFIX, NAME, CONST, COPY, ATOM -->
+  <!-- TAIL: SUFFIX, NAME, CONST, ATOM -->
   <xsl:template match="o" mode="tail">
-    <xsl:if test="@copy">
-      <xsl:text>'</xsl:text>
-    </xsl:if>
     <xsl:if test="@as">
       <xsl:text>:</xsl:text>
       <xsl:value-of select="@as"/>

eo-parser/src/test/resources/org/eolang/parser/packs/full-syntax.yaml

@@ -1,5 +1,6 @@
 xsls: []
 tests:
+  - /program/errors[count(error)=0]
   - /program/license[text()!='']
   - /program/metas[count(meta)=4]
   - /program/metas/meta[head='foo' and tail='']
@@ -43,7 +44,7 @@ eo: |
           z
         f
           12:foo
-          ((t' r 8.54 "yes" "\t").print 88 0x1f):hey
+          ((t r 8.54 "yes" "\t").print 88 0x1f):hey
           TRUE:vtx
           false:fle > a!
             []
@@ -58,8 +59,8 @@ eo: |
           q
           .w
           .e:qwerty > qwe
-      f'
-        z'
+      f
+        z
           (z 5):0
           z:1
       a.
@@ -93,21 +94,21 @@ eo: |
       t.o
     .two "hello!"
     .three > a1
-    .four (a b c') > a2
+    .four (a b c) > a2
     .five > a3
 
   test
     me
       (now (f (f (f (f 1)))).f):i
 
-  # This is the default 64+ symbols comment in front of abstract object
+  # This is the default 64+ symbols comment in front of abstract object.
   [] > ooo
     # This is one
-    # This is the default 64+ symbols comment in front of abstract object
+    # This is the default 64+ symbols comment in front of abstract object.
     [] > o-1 /?
 
     # This is two
-    # This is the default 64+ symbols comment in front of abstract object
+    # This is the default 64+ symbols comment in front of abstract object.
     [] > o2
 
   -2.4E3 > x

eo-parser/src/test/resources/org/eolang/parser/typos/long-character.yaml

@@ -1,4 +1,4 @@
-line: 6
+line: 1
 eo: |
   # This is the default 64+ symbols comment in front of abstract object
   [args] > app

eo-runtime/src/test/eo/org/eolang/runtime-tests.eo

@@ -274,16 +274,6 @@
       64
     a.free
 
-# Test.
-[] > copy-object-with-dot
-  # Book.
-  [] > book
-    "qwerty" > title
-  book.title' > copy-title
-  eq. > @
-    copy-title
-    "qwerty"
-
 # Test.
 [] > parent-in-vertical-notation
   (memory 5).alloc > m