Predicator.Errors.LocationError (predicator v3.5.0)

Error struct for location expression validation failures.

This error is raised when attempting to resolve a location path for assignment operations, but the expression does not represent a valid assignable location.

Error Types

:not_assignable - Expression cannot be used as an assignment target
:invalid_node - Unknown or unsupported AST node type
:undefined_variable - Variable referenced in bracket key is not defined
:invalid_key - Bracket key is not a valid string or integer
:computed_key - Computed expressions cannot be used as assignment keys

Examples

# Cannot assign to literal values
%LocationError{
  type: :not_assignable,
  message: "Cannot assign to literal value",
  details: %{expression_type: "literal value", value: 42}
}

# Cannot assign to function calls
%LocationError{
  type: :not_assignable,
  message: "Cannot assign to function call",
  details: %{expression_type: "function call", value: "len"}
}

# Invalid bracket key type
%LocationError{
  type: :invalid_key,
  message: "Bracket key must be string or integer",
  details: %{key_type: "boolean", key_value: true}
}

Summary

Types

error_type()

t()

Functions

computed_key(message, expression)

Creates a LocationError for computed expressions used as bracket keys.

invalid_key(message, key_value)

Creates a LocationError for invalid bracket key types.

invalid_node(message, node)

Creates a LocationError for invalid or unknown AST node types.

not_assignable(expression_type, value)

Creates a LocationError for non-assignable expressions.

undefined_variable(message, variable_name)

Creates a LocationError for undefined variables in bracket keys.