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A toolkit for data mapping and language integrated query for Elixir
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lib/ecto/query/builder/select.ex
defmodule Ecto.Query.Builder.Select do
@moduledoc false
alias Ecto.Query.Builder
@doc """
Escapes a select.
It allows tuples, lists and variables at the top level. Inside the
tuples and lists query expressions are allowed.
## Examples
iex> escape({1, 2}, [], __ENV__)
{{:{}, [], [:{}, [], [1, 2]]}, %{}}
iex> escape([1, 2], [], __ENV__)
{[1, 2], %{}}
iex> escape(quote(do: x), [x: 0], __ENV__)
{{:{}, [], [:&, [], [0]]}, %{}}
iex> escape(quote(do: ^123), [], __ENV__)
{{:{}, [], [:^, [], [0]]}, %{0 => {123, :any}}}
"""
@spec escape(Macro.t, Keyword.t, Macro.Env.t) :: {Macro.t, %{}}
def escape(other, vars, env) do
escape(other, %{}, vars, env)
end
# Tuple
defp escape({left, right}, params, vars, env) do
escape({:{}, [], [left, right]}, params, vars, env)
end
# Tuple
defp escape({:{}, _, list}, params, vars, env) do
{list, params} = Enum.map_reduce(list, params, &escape(&1, &2, vars, env))
expr = {:{}, [], [:{}, [], list]}
{expr, params}
end
# Map
defp escape({:%{}, _, pairs}, params, vars, env) do
{pairs, params} = Enum.map_reduce pairs, params, fn({k, v}, acc) ->
unless is_atom(k) or is_binary(k) or is_number(k) do
Builder.error! "keys can only be atoms/binaries/integers/floats"
end
{expr, params} = escape(v, acc, vars, env)
{{k, expr}, params}
end
expr = {:{}, [], [:%{}, [], pairs]}
{expr, params}
end
# List
defp escape(list, params, vars, env) when is_list(list) do
Enum.map_reduce(list, params, &escape(&1, &2, vars, env))
end
# var - where var is bound
defp escape({var, _, context}, params, vars, _env)
when is_atom(var) and is_atom(context) do
expr = Builder.escape_var(var, vars)
{expr, params}
end
defp escape(other, params, vars, env) do
Builder.escape(other, :any, params, vars, env)
end
@doc """
Builds a quoted expression.
The quoted expression should evaluate to a query at runtime.
If possible, it does all calculations at compile time to avoid
runtime work.
"""
@spec build(Macro.t, [Macro.t], Macro.t, Macro.Env.t) :: Macro.t
def build(query, binding, expr, env) do
binding = Builder.escape_binding(binding)
{expr, params} = escape(expr, binding, env)
params = Builder.escape_params(params)
select = quote do: %Ecto.Query.SelectExpr{
expr: unquote(expr),
params: unquote(params),
file: unquote(env.file),
line: unquote(env.line)}
Builder.apply_query(query, __MODULE__, [select], env)
end
@doc """
The callback applied by `build/4` to build the query.
"""
@spec apply(Ecto.Queryable.t, term) :: Ecto.Query.t
def apply(query, select) do
query = Ecto.Queryable.to_query(query)
if query.select do
Builder.error! "only one select expression is allowed in query"
else
%{query | select: select}
end
end
end