Add PHP 8.5 emitter

src/main/php/lang/ast/emit/PHP85.class.php

@@ -0,0 +1,57 @@
+<?php namespace lang\ast\emit;
+
+use lang\ast\types\{
+  IsArray,
+  IsFunction,
+  IsGeneric,
+  IsIntersection,
+  IsLiteral,
+  IsMap,
+  IsNullable,
+  IsUnion,
+  IsValue
+};
+
+/**
+ * PHP 8.5 syntax
+ *
+ * @test lang.ast.unittest.emit.PHP85Test
+ * @see  https://wiki.php.net/rfc#php_85
+ */
+class PHP85 extends PHP {
+  use RewriteBlockLambdaExpressions;
+
+  public $targetVersion= 80500;
+
+  /** Sets up type => literal mappings */
+  public function __construct() {
+    $this->literals= [
+      IsArray::class        => function($t) { return 'array'; },
+      IsMap::class          => function($t) { return 'array'; },
+      IsFunction::class     => function($t) { return 'callable'; },
+      IsValue::class        => function($t) { return $t->literal(); },
+      IsNullable::class     => function($t) {
+        if (null === ($l= $this->literal($t->element))) return null;
+        return $t->element instanceof IsUnion ? $l.'|null' : '?'.$l;
+      },
+      IsIntersection::class => function($t) {
+        $i= '';
+        foreach ($t->components as $component) {
+          if (null === ($l= $this->literal($component))) return null;
+          $i.= '&'.$l;
+        }
+        return substr($i, 1);
+      },
+      IsUnion::class        => function($t) {
+        $u= '';
+        foreach ($t->components as $component) {
+          if (null === ($l= $this->literal($component))) return null;
+          $u.= '|'.$l;
+        }
+        return substr($u, 1);
+      },
+      IsLiteral::class      => function($t) { return $t->literal(); },
+      IsGeneric::class      => function($t) { return null; }
+    ];
+  }
+}

src/test/php/lang/ast/unittest/emit/PHP85Test.class.php

@@ -0,0 +1,26 @@
+<?php namespace lang\ast\unittest\emit;
+
+use lang\ast\emit\Type;
+use test\{Assert, Test};
+
+class PHP85Test extends EmittingTest {
+
+  /** @return string */
+  protected function runtime() { return 'php:8.5.0'; }
+
+  #[Test]
+  public function pipe_operator() {
+    Assert::equals(
+      '"test"|>strtoupper(...);',
+      $this->emit('"test" |> strtoupper(...);')
+    );
+  }
+
+  #[Test]
+  public function nullsafepipe_operator() {
+    Assert::equals(
+      'null===($_0="test")?null:$_0|>strtoupper(...);',
+      $this->emit('"test" ?|> strtoupper(...);')
+    );
+  }
+}