Bug 956567 - [prettify] Pretty print in the debugger produces invalid js. r=fitzgen

toolkit/devtools/pretty-fast/pretty-fast.js

@@ -463,6 +463,13 @@
     return str.replace(/\n/g, "\\n");
   }
 
+  /**
+   * Make sure that we put "\'" into the single-quoted output instead of raw single quotes.
+   */
+  function sanitizeSingleQuotes(str) {
+    return str.replace(/\'/g, "\\'");
+  }
+
   /**
    * Add the given token to the pretty printed results.
    *
@@ -475,7 +482,7 @@
    */
   function addToken(token, write, options) {
     if (token.type.type == "string") {
-      write("'" + sanitizeNewlines(token.value) + "'",
+      write("'" + sanitizeSingleQuotes(sanitizeNewlines(token.value)) + "'",
             token.startLoc.line,
             token.startLoc.column);
     } else {

toolkit/devtools/pretty-fast/tests/unit/test.js

@@ -179,7 +179,7 @@ var testCases = [
   {
     name: "String with quote",
     input: "var foo = \"'\";\n",
-    output: "var foo = '\'';\n"
+    output: "var foo = '\\'';\n"
   },
 
   {