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A toolkit for data mapping and language integrated query for Elixir
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lib/ecto/query/builder/limit_offset.ex
import Kernel, except: [apply: 3]
defmodule Ecto.Query.Builder.LimitOffset do
@moduledoc false
alias Ecto.Query.Builder
@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(:limit | :offset, Macro.t, [Macro.t], Macro.t, Macro.Env.t) :: Macro.t
def build(type, query, binding, expr, env) do
{query, binding} = Builder.escape_binding(query, binding, env)
{expr, {params, :acc}} = Builder.escape(expr, :integer, {[], :acc}, binding, env)
params = Builder.escape_params(params)
if contains_variable?(expr) do
Builder.error! "query variables are not allowed in #{type} expression"
end
limoff = quote do: %Ecto.Query.QueryExpr{
expr: unquote(expr),
params: unquote(params),
file: unquote(env.file),
line: unquote(env.line)}
Builder.apply_query(query, __MODULE__, [type, limoff], env)
end
defp contains_variable?(ast) do
ast
|> Macro.prewalk(false, fn
{:&, _, [_]} = expr, _ -> {expr, true}
expr, acc -> {expr, acc}
end)
|> elem(1)
end
@doc """
The callback applied by `build/4` to build the query.
"""
@spec apply(Ecto.Queryable.t, :limit | :offset, term) :: Ecto.Query.t
def apply(%Ecto.Query{} = query, :limit, expr) do
%{query | limit: expr}
end
def apply(%Ecto.Query{} = query, :offset, expr) do
%{query | offset: expr}
end
def apply(query, kind, expr) do
apply(Ecto.Queryable.to_query(query), kind, expr)
end
end