storm-config 0.28.176

use std::error::Error;

use crate::errors::{ConfigError, Unexpected};
use crate::map::Map;
use crate::value::{Value, ValueKind};

/// Describes a format of configuration source data
///
/// Implementations of this trait can be used to convert [`File`](crate::File) sources to configuration data.
///
/// There can be various formats, some of them provided by this library, such as JSON, Yaml and other.
/// This trait enables users of the library to easily define their own, even proprietary formats without
/// the need to alter library sources.
///
/// What is more, it is recommended to use this trait with custom [`Source`](crate::Source)s and their async counterparts.
pub trait Format {
  /// Parses provided content into configuration values understood by the library.
  ///
  /// It also allows specifying optional URI of the source associated with format instance that can facilitate debugging.
  fn parse(
    &self,
    uri: Option<&String>,
    text: &str,
  ) -> Result<Map<String, Value>, Box<dyn Error + Send + Sync>>;
}

// Have a proper error fire if the root of a file is ever not a Table
pub fn extract_root_table(
  uri: Option<&String>,
  value: Value,
) -> Result<Map<String, Value>, Box<dyn Error + Send + Sync>> {
  match value.kind {
    ValueKind::Table(map) => Ok(map),
    ValueKind::Nil => Err(Unexpected::Unit),
    ValueKind::Array(_value) => Err(Unexpected::Seq),
    ValueKind::Boolean(value) => Err(Unexpected::Bool(value)),
    ValueKind::I64(value) => Err(Unexpected::I64(value)),
    ValueKind::I128(value) => Err(Unexpected::I128(value)),
    ValueKind::U64(value) => Err(Unexpected::U64(value)),
    ValueKind::U128(value) => Err(Unexpected::U128(value)),
    ValueKind::Float(value) => Err(Unexpected::Float(value)),
    ValueKind::String(value) => Err(Unexpected::Str(value)),
  }
  .map_err(|err| ConfigError::invalid_root(uri, err))
  .map_err(|err| Box::new(err) as Box<dyn Error + Send + Sync>)
}