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A Utilitary package functionalities modules for improve a secure performatic development.
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lib/krug/util/struct.util.ex
defmodule Krug.StructUtil do
@moduledoc """
Utilitary secure module to provide mechanisms to handle some
complex operations on structs.
"""
alias Krug.StringUtil
@doc """
Return a value from a tuple, ignoring the key.
If the tuple is nil or value of key is nil/empty return nil.
If tuple contains only the key, return nil.
## Examples
```elixir
iex > tuple = {:ok}
iex > Krug.StructUtil.get_value_from_tuple(tuple)
nil
```
```elixir
iex > tuple = {:ok,nil}
iex > Krug.StructUtil.get_value_from_tuple(tuple)
nil
```
```elixir
iex > tuple = {:ok,[1,2,3]}
iex > Krug.StructUtil.get_value_from_tuple(tuple)
[1,2,3]
```
```elixir
iex > tuple = {:ok,%{a: 1, b: 2, c: 3}}
iex > Krug.StructUtil.get_value_from_tuple(tuple)
%{a: 1, b: 2, c: 3}
```
```elixir
iex > tuple = {:error,"Operation Error"}
iex > Krug.StructUtil.get_value_from_tuple(tuple)
"Operation Error"
```
"""
def get_value_from_tuple(tuple) do
array = cond do
(nil == tuple) -> nil
true -> Tuple.to_list(tuple)
end
cond do
(nil == array or length(array) == 0) -> nil
true -> array |> Enum.at(1)
end
end
@doc """
Verify if a value is present on a list or not.
If the list is nil/empty return false.
## Examples
```elixir
iex > list = []
iex > Krug.StructUtil.list_contains(list,nil)
false
```
```elixir
iex > list = nil
iex > Krug.StructUtil.list_contains(list,nil)
false
```
```elixir
iex > list = [nil]
iex > Krug.StructUtil.list_contains(list,nil)
true
```
```elixir
iex > list = [1,%{a: 1, b: 2},"",nil,[1,2,3],5]
iex > Krug.StructUtil.list_contains(list,"")
true
```
```elixir
iex > list = [1,%{a: 1, b: 2},"",nil,[1,2,3],5]
iex > Krug.StructUtil.list_contains(list," ")
false
```
```elixir
iex > list = [1,%{a: 1, b: 2},"",nil,[1,2,3],5]
iex > Krug.StructUtil.list_contains(list,%{a: 1, b: 2})
true
```
```elixir
iex > list = [1,%{a: 1, b: 2},"",nil,[1,2,3],5]
iex > Krug.StructUtil.list_contains(list,%{a: 1, b: 5})
false
```
"""
def list_contains(list,value) do
cond do
(nil == list or length(list) == 0) -> false
true -> (Enum.member?(list,value))
end
end
@doc """
Verify if one value of a list ```values``` is present on a list or not.
Return true when find first match. If none value of ```values``` is present on list,
return false.
If the list is nil/empty return false.
## Examples
```elixir
iex > list = []
iex > values = []
iex > Krug.StructUtil.list_contains_one_of(list,values)
false
```
```elixir
iex > list = [1,2,4,6]
iex > values = [5,7,8]
iex > Krug.StructUtil.list_contains_one_of(list,values)
false
```
```elixir
iex > list = [1,2,4,6]
iex > values = [5,7,8,"A",%{a: 1, b: 3},9,6]
iex > Krug.StructUtil.list_contains_one_of(list,values)
true
```
```elixir
iex > list = [1,2,4,6]
iex > values = [5,7,8,"A",%{a: 1, b: 3},9]
iex > Krug.StructUtil.list_contains_one_of(list,values)
false
```
```elixir
iex > list = [1,2,4,6,%{a: 1, b: 3}]
iex > values = [5,7,8,"A",%{a: 1, b: 3},9]
iex > Krug.StructUtil.list_contains_one_of(list,values)
true
```
```elixir
iex > list = [1,2,4,6,%{a: 1, b: 3}]
iex > values = [5,7,8,"A",%{a: 1, b: 5},9]
iex > Krug.StructUtil.list_contains_one_of(list,values)
false
```
"""
def list_contains_one_of(list,values) do
cond do
(nil == list or length(list) == 0 or nil == values or length(values) == 0) -> false
(Enum.member?(list,hd(values))) -> true
true -> list_contains_one_of(list,tl(values))
end
end
@doc """
Return a key par value from a list of key_par strings in format ["key=value","key=value"].
If the key or the list is nil/empty return nil.
## Examples
```elixir
iex > Krug.StructUtil.get_key_par_value_from_list(nil,nil)
nil
```
```elixir
iex > Krug.StructUtil.get_key_par_value_from_list("name",nil)
nil
```
```elixir
iex > Krug.StructUtil.get_key_par_value_from_list(nil,"name")
nil
```
```elixir
iex > Krug.StructUtil.get_key_par_value_from_list([],"name")
nil
```
```elixir
iex > list = ["name=Johannes Backend","email=johannes@has.not.email"]
iex > Krug.StructUtil.get_key_par_value_from_list("",list)
nil
```
```elixir
iex > list = ["name=Johannes Backend","email=johannes@has.not.email"]
iex > Krug.StructUtil.get_key_par_value_from_list("keyNotExist",list)
nil
```
```elixir
iex > list = ["name=Johannes Backend","email=johannes@has.not.email"]
iex > Krug.StructUtil.get_key_par_value_from_list("name",list)
"Johannes Backend"
```
```elixir
iex > list = ["name=Johannes Backend","email=johannes@has.not.email"]
iex > Krug.StructUtil.get_key_par_value_from_list("email",list)
"johannes@has.not.email"
```
```elixir
iex > list = [" name = Johannes Backend ","email=johannes@has.not.email"]
iex > Krug.StructUtil.get_key_par_value_from_list("email",list)
"Johannes Backend"
```
"""
@doc since: "0.2.1"
def get_key_par_value_from_list(key,list) do
cond do
(nil == key or nil == list or StringUtil.trim(key) == "" or length(list) == 0) -> nil
true -> get_key_par_value_from_string(key,list)
end
end
defp get_key_par_value_from_string(key,list) do
value_from_key = get_key_value_from_string(key,hd(list))
cond do
(nil != value_from_key) -> value_from_key
true -> get_key_par_value_from_list(key,tl(list))
end
end
defp get_key_value_from_string(key,string) do
key_value_array = StringUtil.split(string,"=")
cond do
(length(key_value_array) < 2) -> nil
(StringUtil.trim(hd(key_value_array)) == key) -> key_value_array |> Enum.at(1) |> StringUtil.trim()
true -> nil
end
end
end