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exosql
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0.1.0
Universal SQL engine for Elixir. This library implements the SQL logic to perform queries on user provided databases using a simple interface based on Foreign Data Wrappers from PostgreSQL.
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lib/expr.ex
require Logger
defmodule ExoSQL.Expr do
import ExoSQL.Utils, only: [to_number: 1]
def run_expr({:op, {"and", op1, op2}}, cur) do
r1 = run_expr(op1, cur)
r2 = run_expr(op2, cur)
r1 && r2
end
def run_expr({:op, {"AND", op1, op2}}, cur) do
r1 = run_expr(op1, cur)
r2 = run_expr(op2, cur)
r1 && r2
end
def run_expr({:op, {"=", op1, op2}}, cur), do: run_expr(op1, cur) == run_expr(op2, cur)
def run_expr({:op, {"==", op1, op2}}, cur), do: run_expr(op1, cur) == run_expr(op2, cur)
def run_expr({:op, {">", op1, op2}}, cur) do
{:ok, n1} = to_number(run_expr(op1, cur))
{:ok, n2} = to_number(run_expr(op2, cur))
n1 > n2
end
def run_expr({:op, {">=", op1, op2}}, cur) do
{:ok, n1} = to_number(run_expr(op1, cur))
{:ok, n2} = to_number(run_expr(op2, cur))
n1 >= n2
end
def run_expr({:op, {"*", op1, op2}}, cur) do
{:ok, n1} = to_number(run_expr(op1, cur))
{:ok, n2} = to_number(run_expr(op2, cur))
n1 * n2
end
def run_expr({:op, {"||", op1, op2}}, cur) do
s1 = to_string(run_expr(op1, cur))
s2 = to_string(run_expr(op2, cur))
s1<>s2
end
def run_expr({:fn, {fun, exprs}}, cur) when is_atom(fun) do
params = for e <- exprs, do: run_expr(e, cur)
apply(ExoSQL.Builtins, fun, params)
end
def run_expr({:fn, {fun, exprs}}, cur) do
params = for e <- exprs, do: run_expr(e, cur)
apply(ExoSQL.Builtins, String.to_existing_atom(String.downcase(fun)), params)
end
def run_expr({:pass, val}, _cur), do: val
def run_expr({:lit, val}, _cur), do: val
def run_expr({:column, n}, cur) when is_number(n) do
Enum.at(cur, n)
end
end