Fix error when parsing .gyp file with a backslash

index.js

@@ -176,6 +176,8 @@ function parseString(input, at) {
   if (input[at] !== '"' && input[at] !== "'")
     return [ new ParseError(input, at, 'Expected \' or "') ];
   const type = input[at++];
+  const cr = String.fromCodePoint(0x0D);
+  const lf = String.fromCodePoint(0x0A);
   let value = '';
   while (input[at] !== type) {
     if (input[at] === '\\') {
@@ -208,7 +210,18 @@ function parseString(input, at) {
           value += String.fromCodePoint(parseInt(hexString, 16));
           at += 2;
           break;
-        } default:
+        }
+        case cr:
+          if (input[at + 1] === lf) {
+            at += 2;
+          } else {
+            at++;
+          }
+          break;
+        case lf:
+          at++;
+          break;
+        default:
           return [ new ParseError(input, at, 'Unknown escape character') ];
       }
     } else {

test/multiline_cr.in

@@ -0,0 +1 @@
+{  'foo': ['bar '          'baz'],  'qux \quux': 'corge',}

test/multiline_cr.out

@@ -0,0 +1 @@
+{  "foo": ["bar baz"],  "qux quux": "corge"}

test/multiline_crlf.in

@@ -0,0 +1,6 @@
+{
+  'foo': ['bar '
+          'baz'],
+  'qux \
+quux': 'corge',
+}

test/multiline_crlf.out

@@ -0,0 +1,4 @@
+{
+  "foo": ["bar baz"],
+  "qux quux": "corge"
+}

test/multiline_lf.in

@@ -0,0 +1,6 @@
+{
+  'foo': ['bar '
+          'baz'],
+  'qux \
+quux': 'corge',
+}

test/multiline_lf.out

@@ -0,0 +1,4 @@
+{
+  "foo": ["bar baz"],
+  "qux quux": "corge"
+}