# `ToonEx.Constants`
[🔗](https://github.com/ohhi-vn/toon_ex/blob/v1.1.0/lib/toon_ex/shared/constants.ex#L1)

Constants used throughout the TOON encoder and decoder.

This module defines all the string literals, delimiters, and special
characters used in the TOON format.

## Performance

Constants are defined as module attributes and exposed via `@compile {:inline}`
functions. This allows the compiler to inline constant access at call sites,
avoiding function call overhead in the hot encoding path.

For use in `@compile {:inline}` contexts, the attribute values can be referenced
directly via the zero-arity functions, which the compiler will inline.

# `backslash`

# `close_brace`

# `close_bracket`

# `close_paren`

# `colon`

# `comma`

# `control_chars`

```elixir
@spec control_chars() :: [String.t()]
```

Returns the list of control characters that need escaping.

# `default_delimiter`

# `default_indent`

# `delimiters`

# `double_quote`

# `escape_sequences`

# `false_literal`

# `list_item_marker`

# `list_item_prefix`

# `newline`

# `null_literal`

# `open_brace`

# `open_bracket`

# `open_paren`

# `pipe`

# `space`

# `structure_chars`

```elixir
@spec structure_chars() :: [String.t()]
```

Returns the list of structure characters that require quoting in keys and values.
Note: Comma is NOT included here as it's only special when it's the active delimiter.

# `tab`

# `true_literal`

# `unescape_sequences`

# `valid_delimiter?`

```elixir
@spec valid_delimiter?(String.t()) :: boolean()
```

Checks if a delimiter is valid.

# `valid_delimiters`

```elixir
@spec valid_delimiters() :: [String.t()]
```

Returns the list of valid delimiter values.

---

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