feat: print flexible nowdoc (#1291)

Author: czosel

CONTRIBUTING.md

@@ -38,7 +38,7 @@ Add the following configuration to `.vscode/launch.json`:
         "<node_internals>/**"
     ],
     "program": "${workspaceRoot}/node_modules/.bin/prettier",
-    "args": ["--plugin=.", "--parser=php", "foo.php"],
+    "args": ["--plugin=.", "--parser=php", "test.php"],
     "cwd": "${workspaceRoot}",
     "outputCapture": "std"
 }

package.json

@@ -13,7 +13,7 @@
   "dependencies": {
     "linguist-languages": "^7.5.1",
     "mem": "^6.0.1",
-    "php-parser": "glayzzle/php-parser#2db61274ac1bae55a02236a498b113aba7f31326"
+    "php-parser": "3.0.0"
   },
   "devDependencies": {
     "@babel/preset-env": "^7.7.5",

src/printer.js

@@ -2844,18 +2844,20 @@ function printNode(path, options, print) {
       );
     case "magic":
       return node.value;
-    case "nowdoc":
-      // Respect `indent` for `nowdoc` nodes
+    case "nowdoc": {
+      const flexible = isMinVersion(options.phpVersion, "7.3");
+      const linebreak = flexible ? hardline : literalline;
       return concat([
         "<<<'",
         node.label,
         "'",
-        literalline,
-        join(literalline, node.value.split(/\r?\n/g)),
-        literalline,
+        linebreak,
+        join(linebreak, node.value.split(/\r?\n/g)),
+        linebreak,
         node.label,
         docShouldHaveTrailingNewline(path) ? hardline : "",
       ]);
+    }
     case "name":
       return concat([node.resolution === "rn" ? "namespace\\" : "", node.name]);
     case "literal":