# `LeXtract.Error`
[🔗](https://github.com/YgorCastor/lextract.git/blob/main/lib/lextract/error.ex#L1)

Main error aggregator for LeXtract using Splode.

This module provides structured error handling with four error classes:
- `:invalid` - Validation and format errors
- `:processing` - Processing pipeline failures
- `:external` - External service/resource failures
- `:unknown` - Unexpected errors

## Examples

    iex> error = LeXtract.Error.Invalid.Format.exception(format_string: "xml")
    iex> LeXtract.Error.splode_error?(error)
    true

    iex> errors = [
    ...>   LeXtract.Error.Processing.Parsing.exception(format: :json, reason: "unexpected token"),
    ...>   LeXtract.Error.Invalid.Config.exception(errors: [])
    ...> ]
    iex> class_error = LeXtract.Error.to_class(errors)
    iex> match?(%LeXtract.Error.Invalid{}, class_error)
    true

# `class`

```elixir
@type class() :: %{
  :__struct__ => class_module(),
  :__exception__ => true,
  :errors => [t()],
  :class => error_class(),
  :bread_crumbs => [String.t()],
  :vars => Keyword.t(),
  :stacktrace => Splode.Stacktrace.t() | nil,
  :context => map(),
  optional(atom()) => any()
}
```

# `class_module`

```elixir
@type class_module() ::
  LeXtract.Error.Unknown
  | LeXtract.Error.External
  | LeXtract.Error.Processing
  | LeXtract.Error.Invalid
```

# `error_class`

```elixir
@type error_class() :: :unknown | :external | :processing | :invalid
```

# `t`

```elixir
@type t() :: %{
  :__struct__ => module(),
  :__exception__ => true,
  :class => error_class(),
  :bread_crumbs => [String.t()],
  :vars => Keyword.t(),
  :stacktrace => Splode.Stacktrace.t() | nil,
  :context => map(),
  optional(atom()) => any()
}
```

# `splode_error?`

# `traverse_errors`

Traverses errors, calling `fun` for each leaf error, and returns a nested
map of results grouped by each error's `path`.

See `Splode.traverse_errors/2` for full documentation.

## Example

    iex> Elixir.LeXtract.Error.traverse_errors(error, fn error ->
    ...>   Exception.message(error)
    ...> end)
    %{name: ["name is required"]}

# `unwrap!`

Raises an error if the result is an error, otherwise returns the result

Alternatively, you can use the `defsplode` macro, which does this automatically.

### Options

- `:error_opts` - Options to pass to `to_error/2` when converting the returned error
- `:unknown_error_opts` - Options to pass to the unknown error if the function returns only `:error`.
  not necessary if your function always returns `{:error, error}`.

### Examples

  def function(arg) do
    case do_something(arg) do
      :success -> :ok
      {:success, result} -> {:ok, result}
      {:error, error} -> {:error, error}
    end
  end

  def function!(arg) do
    YourErrors.unwrap!(function(arg))
  end

---

*Consult [api-reference.md](api-reference.md) for complete listing*