Merge pull request #59 from xp-framework/feature/logical-assignment-operators

Implement logical AND and OR assignment operators (&&=, ||=)

Author: thekid

src/main/php/lang/ast/syntax/PHP.class.php

@@ -4,6 +4,7 @@
   ArrayLiteral,
   Annotation,
   Annotations,
+  Assignment,
   Block,
   Braced,
   BreakStatement,
@@ -233,8 +234,15 @@ public function __construct() {
     $this->assignment('>>=');
     $this->assignment('<<=');
     $this->assignment('??=');
-    $this->assignment('&&=');
-    $this->assignment('||=');
+
+    // Logical AND and OR, not supported in PHP
+    foreach (['&&=', '||='] as $op) {
+      $this->symbol($op, 10)->led= function($parse, $token, $left) use($op) {
+        $assign= new Assignment($left, $op, $this->expression($parse, 9), $left->line);
+        $assign->kind= 'logicalassignment';
+        return $assign;
+      };
+    }
 
     // This is ambiguous:
     //

src/test/php/lang/ast/unittest/parse/OperatorTest.class.php

@@ -64,14 +64,21 @@ public function prefix($operator) {
     );
   }
 
-  #[Test, Values(['=', '+=', '-=', '*=', '/=', '%=', '.=', '**=', '&=', '|=', '^=', '>>=', '<<=', '??=', '&&=', '||='])]
+  #[Test, Values(['=', '+=', '-=', '*=', '/=', '%=', '.=', '**=', '&=', '|=', '^=', '>>=', '<<=', '??='])]
   public function assignment($operator) {
     $this->assertParsed(
       [new Assignment(new Variable('a', self::LINE), $operator, new Variable('b', self::LINE), self::LINE)],
       '$a '.$operator.' $b;'
     );
   }
 
+  #[Test, Values(['&&=', '||='])]
+  public function logical_assignment($operator) {
+    $assignment= new Assignment(new Variable('a', self::LINE), $operator, new Variable('b', self::LINE), self::LINE);
+    $assignment->kind= 'logicalassignment';
+    $this->assertParsed([$assignment], '$a '.$operator.' $b;');
+  }
+
   #[Test]
   public function assignment_to_offset() {
     $target= new OffsetExpression(new Variable('a', self::LINE), new Literal('0', self::LINE), self::LINE);