Merge branch '4.3' into 4.4

* 4.3:
  [Cache] fix memory leak when using PhpFilesAdapter
  [Yaml] Implement multiline string as scalar block for tagged values
  [HttpFoundation] Use `Cache-Control: must-revalidate` only if explicit lifetime has been given
  [FrameworkBundle] Use UserInterface to @return in getUser method
  [CI] Replace php7.4snapshot with php7.4 in Travis configuration
  [ExpressionLanguage][Node][BinaryNode] Process division by zero
  forward caught exception
  [Validator][ConstraintValidator] Stop passing unnecessary timezone argument to \DateTime
  add tags before processing them
  [MonologBridge] Fix debug processor datetime type

Author: nicolas-grekas

Dumper.php

@@ -70,7 +70,7 @@ public function dump($input, int $inline = 0, int $indent = 0, int $flags = 0):
                     $blockIndentationIndicator = (' ' === substr($value, 0, 1)) ? (string) $this->indentation : '';
                     $output .= sprintf("%s%s%s |%s\n", $prefix, $dumpAsMap ? Inline::dump($key, $flags).':' : '-', '', $blockIndentationIndicator);
 
-                    foreach (preg_split('/\n|\r\n/', $value) as $row) {
+                    foreach (explode("\n", $value) as $row) {
                         $output .= sprintf("%s%s%s\n", $prefix, str_repeat(' ', $this->indentation), $row);
                     }
 
@@ -80,6 +80,19 @@ public function dump($input, int $inline = 0, int $indent = 0, int $flags = 0):
                 if ($value instanceof TaggedValue) {
                     $output .= sprintf('%s%s !%s', $prefix, $dumpAsMap ? Inline::dump($key, $flags).':' : '-', $value->getTag());
 
+                    if ($inline >= 1 && Yaml::DUMP_MULTI_LINE_LITERAL_BLOCK & $flags && \is_string($value->getValue()) && false !== strpos($value->getValue(), "\n") && false === strpos($value->getValue(), "\r\n")) {
+                        // If the first line starts with a space character, the spec requires a blockIndicationIndicator
+                        // http://www.yaml.org/spec/1.2/spec.html#id2793979
+                        $blockIndentationIndicator = (' ' === substr($value->getValue(), 0, 1)) ? (string) $this->indentation : '';
+                        $output .= sprintf(" |%s\n", $blockIndentationIndicator);
+
+                        foreach (explode("\n", $value->getValue()) as $row) {
+                            $output .= sprintf("%s%s%s\n", $prefix, str_repeat(' ', $this->indentation), $row);
+                        }
+
+                        continue;
+                    }
+
                     if ($inline - 1 <= 0 || null === $value->getValue() || is_scalar($value->getValue())) {
                         $output .= ' '.$this->dump($value->getValue(), $inline - 1, 0, $flags)."\n";
                     } else {

Tests/DumperTest.php

@@ -487,6 +487,39 @@ public function testDumpingNotInlinedNullTaggedValue()
         $this->assertSame($expected, $this->dumper->dump($data, 2));
     }
 
+    public function testDumpingMultiLineStringAsScalarBlockTaggedValue()
+    {
+        $data = [
+            'foo' => new TaggedValue('bar', "foo\nline with trailing spaces:\n  \nbar\ninteger like line:\n123456789\nempty line:\n\nbaz"),
+        ];
+        $expected = <<<YAML
+foo: !bar |
+    foo
+    line with trailing spaces:
+      
+    bar
+    integer like line:
+    123456789
+    empty line:
+    
+    baz
+
+YAML;
+
+        $this->assertSame($expected, $this->dumper->dump($data, 2, 0, Yaml::DUMP_MULTI_LINE_LITERAL_BLOCK));
+    }
+
+    public function testDumpingInlinedMultiLineIfRnBreakLineInTaggedValue()
+    {
+        $data = [
+            'data' => [
+                'foo' => new TaggedValue('bar', "foo\r\nline with trailing spaces:\n  \nbar\ninteger like line:\n123456789\nempty line:\n\nbaz"),
+            ],
+        ];
+
+        $this->assertSame(file_get_contents(__DIR__.'/Fixtures/multiple_lines_as_literal_block_for_tagged_values.yml'), $this->dumper->dump($data, 2, 0, Yaml::DUMP_MULTI_LINE_LITERAL_BLOCK));
+    }
+
     public function testDumpMultiLineStringAsScalarBlock()
     {
         $data = [

Tests/Fixtures/multiple_lines_as_literal_block_for_tagged_values.yml

@@ -0,0 +1,2 @@
+data:
+    foo: !bar "foo\r\nline with trailing spaces:\n  \nbar\ninteger like line:\n123456789\nempty line:\n\nbaz"