Range Formatter: Remove Program/File from valid Ancestor (#2248)

* Remove Program/File from valid Ancestor

Fix edge range formatting entire file.

* Fix lint with `yarn lint -- --fix`

See https://travis-ci.org/prettier/prettier/jobs/246569943#L242-L260

index.js

@@ -104,7 +104,11 @@ function findSiblingAncestors(startNodeAndParents, endNodeAndParents) {
   let resultEndNode = endNodeAndParents.node;
 
   for (const endParent of endNodeAndParents.parentNodes) {
-    if (util.locStart(endParent) >= util.locStart(startNodeAndParents.node)) {
+    if (
+      endParent.type !== "Program" &&
+      endParent.type !== "File" &&
+      util.locStart(endParent) >= util.locStart(startNodeAndParents.node)
+    ) {
       resultEndNode = endParent;
     } else {
       break;
@@ -112,7 +116,11 @@ function findSiblingAncestors(startNodeAndParents, endNodeAndParents) {
   }
 
   for (const startParent of startNodeAndParents.parentNodes) {
-    if (util.locEnd(startParent) <= util.locEnd(endNodeAndParents.node)) {
+    if (
+      startParent.type !== "Program" &&
+      startParent.type !== "File" &&
+      util.locEnd(startParent) <= util.locEnd(endNodeAndParents.node)
+    ) {
       resultStartNode = startParent;
     } else {
       break;

tests/range/__snapshots__/jsfmt.spec.js.snap

@@ -176,6 +176,46 @@ function ugly ( {a=1,     b     =   2     }      ) {
 
 `;
 
+exports[`range-end.js 1`] = `
+// Unchanged
+call(
+  1, 2,3
+);
+
+
+call(
+  1, 2,3
+);~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+// Unchanged
+call(
+  1, 2,3
+);
+
+
+call(1, 2, 3);
+`;
+
+exports[`range-start.js 1`] = `
+call(
+  1, 2,3
+);
+
+
+// Unchanged
+call(
+  1, 2,3
+);
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+call(1, 2, 3);
+
+
+// Unchanged
+call(
+  1, 2,3
+);
+
+`;
+
 exports[`try-catch.js 1`] = `
 try {}
 catch (err) {}

tests/range/range-end.js

@@ -0,0 +1,9 @@
+// Unchanged
+call(
+  1, 2,3
+);
+
+<<<PRETTIER_RANGE_START>>>
+call(
+  1, 2,3
+);<<<PRETTIER_RANGE_END>>>

tests/range/range-start.js

@@ -0,0 +1,9 @@
+<<<PRETTIER_RANGE_START>>>call(
+  1, 2,3
+);
+<<<PRETTIER_RANGE_END>>>
+
+// Unchanged
+call(
+  1, 2,3
+);