Add --version flag to php-parse

Author: nikic

bin/php-parse

@@ -26,13 +26,10 @@ if (empty($files)) {
     showHelp("Must specify at least one file.");
 }
 
-$lexer = new PhpParser\Lexer\Emulative(['usedAttributes' => [
+$lexerOptions = ['usedAttributes' => [
     'startLine', 'endLine', 'startFilePos', 'endFilePos', 'comments'
-]]);
-$parser = (new PhpParser\ParserFactory)->create(
-    PhpParser\ParserFactory::PREFER_PHP7,
-    $lexer
-);
+]];
+$parser = (new PhpParser\ParserFactory())->createForVersion($attributes['version'], $lexerOptions);
 $dumper = new PhpParser\NodeDumper([
     'dumpComments' => true,
     'dumpPositions' => $attributes['with-positions'],
@@ -108,7 +105,7 @@ function showHelp($error = '') {
     if ($error) {
         fwrite(STDERR, $error . "\n\n");
     }
-    fwrite($error ? STDERR : STDOUT, <<<OUTPUT
+    fwrite($error ? STDERR : STDOUT, <<<'OUTPUT'
 Usage: php-parse [operations] file1.php [file2.php ...]
    or: php-parse [operations] "<?php code"
 Turn PHP source code into an abstract syntax tree.
@@ -123,6 +120,7 @@ Operations is a list of the following options (--dump by default):
     -c, --with-column-info  Show column-numbers for errors (if available)
     -P, --with-positions    Show positions in node dumps
     -r, --with-recovery     Use parsing with error recovery
+        --version=VERSION   Target specific PHP version (default: newest)
     -h, --help              Display this page
 
 Example:
@@ -143,6 +141,7 @@ function parseArgs($args) {
         'with-column-info' => false,
         'with-positions' => false,
         'with-recovery' => false,
+        'version' => PhpParser\PhpVersion::getNewestSupported(),
     ];
 
     array_shift($args);
@@ -193,7 +192,9 @@ function parseArgs($args) {
                 $parseOptions = false;
                 break;
             default:
-                if ($arg[0] === '-') {
+                if (preg_match('/^--version=(.*)$/', $arg, $matches)) {
+                    $attributes['version'] = PhpParser\PhpVersion::fromString($matches[1]);
+                } elseif ($arg[0] === '-') {
                     showHelp("Invalid operation $arg.");
                 } else {
                     $files[] = $arg;