[all-commits] [llvm/llvm-project] 38de1c: [JSON] Display errors associated with Paths in con...

[Sam McCall via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 38de1c33a8374bb16abfb024a973d851c170bafc
      https://github.com/llvm/llvm-project/commit/38de1c33a8374bb16abfb024a973d851c170bafc
  Author: Sam McCall <sam.mccall at gmail.com>
  Date:   2020-09-24 (Thu, 24 Sep 2020)

  Changed paths:
    M llvm/include/llvm/Support/JSON.h
    M llvm/lib/Support/JSON.cpp
    M llvm/unittests/Support/JSONTest.cpp

  Log Message:
  -----------
  [JSON] Display errors associated with Paths in context

When an error occurs processing a JSON object, seeing the actual
surrounding data helps. Dumping just the node where the problem
was identified can be too much or too little information.

printErrorContext() shows the error message in its context, as a comment.
JSON values along the path to the broken place are shown in some detail,
the rest of the document is elided. For example:

```
{
  "credentials": [
    {
      "username": /* error: expected string */ 42,
      "password": "secret"
    },
    { ... }
  ]
  "backups": { ... }
}
```

Differential Revision: https://reviews.llvm.org/D88103