Handle unconventional newlines (#1050)

The `\r` test has had to be deleted because jest doesn't properly save and parse the snapshot back.

Fixes #883

src/util.js

@@ -166,20 +166,23 @@ function skipNewline(text, index, opts) {
   const backwards = opts && opts.backwards;
   if (index === false) {
     return false;
-  } else if (backwards) {
-    if (text.charAt(index) === "\n") {
+  }
+
+  const atIndex = text.charAt(index);
+  if (backwards) {
+    if (atIndex === "\n" || atIndex === "\r" ||  atIndex === "\u2028" ||  atIndex === "\u2029") {
       return index - 1;
     }
-    if (text.charAt(index - 1) === "\r" && text.charAt(index) === "\n") {
+    if (text.charAt(index - 1) === "\r" && atIndex === "\n") {
       return index - 2;
     }
   } else {
-    if (text.charAt(index) === "\n") {
-      return index + 1;
-    }
-    if (text.charAt(index) === "\r" && text.charAt(index + 1) === "\n") {
+    if (atIndex === "\r" && text.charAt(index + 1) === "\n") {
       return index + 2;
     }
+    if (atIndex === "\n" || atIndex === "\r" ||  atIndex === "\u2028" ||  atIndex === "\u2029") {
+      return index + 1;
+    }
   }
 
   return index;

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

@@ -0,0 +1,15 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`backslash_2028.js 1`] = `
+"1;/*a*///b
/*c*/2
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+1; /*a*/ //b
/*c*/2
+"
+`;
+
+exports[`backslash_2029.js 1`] = `
+"1;/*a*///b
/*c*/2
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+1; /*a*/ //b
/*c*/2
+"
+`;

tests/newline/backslash_2028.js

@@ -0,0 +1 @@
+1;/*a*///b
/*c*/2

tests/newline/backslash_2029.js

@@ -0,0 +1 @@
+1;/*a*///b
/*c*/2

tests/newline/jsfmt.spec.js

@@ -0,0 +1 @@
+run_spec(__dirname);