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ash_postgres
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0.43.0
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0.1.4
0.1.3
0.1.2
0.1.1
0.1.1-rc.2
0.1.1-rc.1
0.1.1-rc.0
0.1.0
The PostgreSQL data layer for Ash Framework
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Files
lib/functions/fragment.ex
defmodule AshPostgres.Functions.Fragment do
@moduledoc """
A function that maps to ecto's `fragment` function
https://hexdocs.pm/ecto/Ecto.Query.API.html#fragment/1
This function is highly based off of that implementation.
"""
use Ash.Query.Function, name: :fragment
# Varargs is special, and should only be used in rare circumstances (like this one)
# no type casting or help can be provided for these functions.
def args, do: :var_args
def new([fragment | _]) when not is_binary(fragment) do
{:error, "First argument to `fragment` must be a string."}
end
def new([fragment | rest]) do
split = split_fragment(fragment)
if Enum.count(split, &(&1 == :slot)) != length(rest) do
{:error,
"fragment(...) expects extra arguments in the same amount of question marks in string. " <>
"It received #{Enum.count(split, &(&1 == :slot))} extra argument(s) but expected #{length(rest)}"}
else
{:ok, %__MODULE__{arguments: merge_fragment(split, rest)}}
end
end
def casted_new([fragment | _]) when not is_binary(fragment) do
{:error, "First argument to `fragment` must be a string."}
end
def casted_new([fragment | rest]) do
split = split_fragment(fragment)
if Enum.count(split, &(&1 == :slot)) != length(rest) do
{:error,
"fragment(...) expects extra arguments in the same amount of question marks in string. " <>
"It received #{Enum.count(split, &(&1 == :slot))} extra argument(s) but expected #{length(rest)}"}
else
{:ok, %__MODULE__{arguments: merge_fragment(split, rest, :casted_expr)}}
end
end
defp merge_fragment(expr, args, tag \\ :expr)
defp merge_fragment([], [], _tag), do: []
defp merge_fragment([:slot | rest], [arg | rest_args], tag) do
[{tag, arg} | merge_fragment(rest, rest_args, tag)]
end
defp merge_fragment([val | rest], rest_args, tag) do
[{:raw, val} | merge_fragment(rest, rest_args, tag)]
end
defp split_fragment(frag, consumed \\ "")
defp split_fragment(<<>>, consumed),
do: [consumed]
defp split_fragment(<<??, rest::binary>>, consumed),
do: [consumed, :slot | split_fragment(rest, "")]
defp split_fragment(<<?\\, ??, rest::binary>>, consumed),
do: split_fragment(rest, consumed <> <<??>>)
defp split_fragment(<<first::utf8, rest::binary>>, consumed),
do: split_fragment(rest, consumed <> <<first::utf8>>)
end