Include emitters in xp compile output

Author: thekid

README.md

@@ -59,8 +59,8 @@ $ xp compile -o dist.xar src/main/php/
 # Compile src/main/php, do not write output
 $ xp compile -n src/main/php/
 
-# Target PHP 7.0 (default target is current PHP version)
-$ xp compile -t PHP.7.0 HelloWorld.php HelloWorld.class.php
+# Target PHP 7.4 (default target is current PHP version)
+$ xp compile -t PHP.7.4 HelloWorld.php HelloWorld.class.php
 ```
 
 The -o and -n options accept multiple input sources following them.
@@ -81,7 +81,12 @@ $ xp compile
 Usage: xp compile <in> [<out>]
 
 @FileSystemCL<./vendor/xp-framework/compiler/src/main/php>
-lang.ast.syntax.php.Using
+lang.ast.emit.PHP70
+lang.ast.emit.PHP71
+lang.ast.emit.PHP72
+lang.ast.emit.PHP74
+lang.ast.emit.PHP80 [*]
+lang.ast.syntax.php.Using [*]
 
 @FileSystemCL<./vendor/xp-lang/php-is-operator/src/main/php>
 lang.ast.syntax.php.IsOperator

src/main/php/xp/compiler/CompileRunner.class.php

@@ -30,9 +30,9 @@
  *   ```sh
  *   $ xp compile -n src/main/php/
  *   ```
- * - Target PHP 7.0 (default target is current PHP version)
+ * - Target PHP 7.4 (default target is current PHP version)
  *   ```sh
- *   $ xp compile -t PHP.7.0 HelloWorld.php HelloWorld.class.php
+ *   $ xp compile -t PHP.7.4 HelloWorld.php HelloWorld.class.php
  *   ```
  *
  * The *-o* and *-n* options accept multiple input sources following them.

src/main/php/xp/compiler/Usage.class.php

@@ -1,6 +1,7 @@
 <?php namespace xp\compiler;
 
-use lang\ast\Language;
+use lang\ast\{Language, Emitter};
+use lang\reflect\Package;
 use util\cmd\Console;
 
 class Usage {
@@ -9,24 +10,31 @@ class Usage {
   public static function main(array $args) {
     Console::$err->writeLine('Usage: xp compile <in> [<out>]');
 
-    // Show syntax implementations sorted by class loader
-    $loaders= $sorted= [];
-    foreach (Language::named('PHP')->extensions() as $extension) {
-      $t= typeof($extension);
-      $l= $t->getClassLoader();
-      $hash= $l->hashCode();
-      if (isset($sorted[$hash])) {
-        $sorted[$hash][]= $t;
-      } else {
-        $loaders[$hash]= $l;
-        $sorted[$hash]= [$t];
+    $impl= new class() {
+      public $byLoader= [];
+
+      public function add($t, $active= false) {
+        $this->byLoader[$t->getClassLoader()->toString()][$t->getName()]= $active;
+      }
+    };
+
+    $default= Emitter::forRuntime('PHP.'.PHP_VERSION);
+    foreach (Package::forName('lang.ast.emit')->getClasses() as $class) {
+      if ($class->isSubclassOf(Emitter::class) && !(MODIFIER_ABSTRACT & $class->getModifiers())) {
+        $impl->add($class, $class->equals($default));
       }
     }
-    foreach ($sorted as $hash => $list) {
+
+    foreach (Language::named('PHP')->extensions() as $extension) {
+      $impl->add(typeof($extension), true);
+    }
+
+    // Show implementations sorted by class loader
+    foreach ($impl->byLoader as $loader => $list) {
       Console::$err->writeLine();
-      Console::$err->writeLine("\033[33m@", $loaders[$hash], "\033[0m");
-      foreach ($list as $syntax) {
-        Console::$err->writeLine($syntax->getName());
+      Console::$err->writeLine("\033[33m@", $loader, "\033[0m");
+      foreach ($list as $impl => $active) {
+        Console::$err->writeLine($impl, $active ? " [\033[36m*\033[0m]" : '');
       }
     }
     return 2;