Don't drop class statements before error (#952)

When encountering a null statement (indicating that an error occurred),
retain the preceding statements. These were accidentally dropped
previously.

Author: xjaja

grammar/php5.y

@@ -469,7 +469,7 @@ static_var:
 ;
 
 class_statement_list_ex:
-      class_statement_list_ex class_statement               { if ($2 !== null) { push($1, $2); } }
+      class_statement_list_ex class_statement               { if ($2 !== null) { push($1, $2); } else { $$ = $1; } }
     | /* empty */                                           { init(); }
 ;
 

grammar/php7.y

@@ -708,7 +708,7 @@ static_var:
 ;
 
 class_statement_list_ex:
-      class_statement_list_ex class_statement               { if ($2 !== null) { push($1, $2); } }
+      class_statement_list_ex class_statement               { if ($2 !== null) { push($1, $2); } else { $$ = $1; } }
     | /* empty */                                           { init(); }
 ;
 

lib/PhpParser/Parser/Php5.php

@@ -1738,7 +1738,7 @@ protected function initReduceCallbacks() {
                  $this->semValue = new Stmt\StaticVar($this->semStack[$stackPos-(3-1)], $this->semStack[$stackPos-(3-3)], $this->startAttributeStack[$stackPos-(3-1)] + $this->endAttributes);
             },
             259 => function ($stackPos) {
-                 if ($this->semStack[$stackPos-(2-2)] !== null) { $this->semStack[$stackPos-(2-1)][] = $this->semStack[$stackPos-(2-2)]; $this->semValue = $this->semStack[$stackPos-(2-1)]; }
+                 if ($this->semStack[$stackPos-(2-2)] !== null) { $this->semStack[$stackPos-(2-1)][] = $this->semStack[$stackPos-(2-2)]; $this->semValue = $this->semStack[$stackPos-(2-1)]; } else { $this->semValue = $this->semStack[$stackPos-(2-1)]; }
             },
             260 => function ($stackPos) {
                  $this->semValue = array();

lib/PhpParser/Parser/Php7.php

@@ -2056,7 +2056,7 @@ protected function initReduceCallbacks() {
                  $this->semValue = new Stmt\StaticVar($this->semStack[$stackPos-(3-1)], $this->semStack[$stackPos-(3-3)], $this->startAttributeStack[$stackPos-(3-1)] + $this->endAttributes);
             },
             340 => function ($stackPos) {
-                 if ($this->semStack[$stackPos-(2-2)] !== null) { $this->semStack[$stackPos-(2-1)][] = $this->semStack[$stackPos-(2-2)]; $this->semValue = $this->semStack[$stackPos-(2-1)]; }
+                 if ($this->semStack[$stackPos-(2-2)] !== null) { $this->semStack[$stackPos-(2-1)][] = $this->semStack[$stackPos-(2-2)]; $this->semValue = $this->semStack[$stackPos-(2-1)]; } else { $this->semValue = $this->semStack[$stackPos-(2-1)]; }
             },
             341 => function ($stackPos) {
                  $this->semValue = array();

test/code/parser/errorHandling/recovery.test

@@ -900,12 +900,13 @@ array(
 <?php
 
 class Foo {
+    public $bar1;
     publi $foo;
     public $bar;
 }
 -----
 !!php7
-Syntax error, unexpected T_STRING from 4:5 to 4:9
+Syntax error, unexpected T_STRING from 5:5 to 5:9
 array(
     0: Stmt_Class(
         attrGroups: array(
@@ -919,6 +920,20 @@ array(
         )
         stmts: array(
             0: Stmt_Property(
+                attrGroups: array(
+                )
+                flags: MODIFIER_PUBLIC (1)
+                type: null
+                props: array(
+                    0: Stmt_PropertyProperty(
+                        name: VarLikeIdentifier(
+                            name: bar1
+                        )
+                        default: null
+                    )
+                )
+            )
+            1: Stmt_Property(
                 attrGroups: array(
                 )
                 flags: MODIFIER_PUBLIC (1)
@@ -1523,4 +1538,4 @@ array(
             )
         )
     )
-)
+)