| function stringify(input) { |
| if (!input) { |
| return 'undefined'; // backwards compat for empty reduce |
| } |
| // for backwards compat with mapreduce, functions/strings are stringified |
| // as-is. everything else is JSON-stringified. |
| switch (typeof input) { |
| case 'function': |
| // e.g. a mapreduce map |
| return input.toString(); |
| case 'string': |
| // e.g. a mapreduce built-in _reduce function |
| return input.toString(); |
| default: |
| // e.g. a JSON object in the case of mango queries |
| return JSON.stringify(input); |
| } |
| } |
| |
| /* create a string signature for a view so we can cache it and uniq it */ |
| function createViewSignature(mapFun, reduceFun) { |
| // the "undefined" part is for backwards compatibility |
| return stringify(mapFun) + stringify(reduceFun) + 'undefined'; |
| } |
| |
| export default createViewSignature; |
