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phoenix
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Productive. Reliable. Fast. A productive web framework that does not compromise speed or maintainability.
Security advisory:
This version has known vulnerabilities.
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lib/phoenix/naming.ex
defmodule Phoenix.Naming do
@moduledoc """
Conveniences for inflecting and working with names in Phoenix.
"""
@doc """
Extracts the resource name from an alias.
## Examples
iex> Phoenix.Naming.resource_name(MyApp.User)
"user"
iex> Phoenix.Naming.resource_name(MyApp.UserView, "View")
"user"
"""
@spec resource_name(String.Chars.t, String.t) :: String.t
def resource_name(alias, suffix \\ "") do
alias
|> to_string()
|> Module.split()
|> List.last()
|> unsuffix(suffix)
|> underscore()
end
@doc """
Removes the given suffix from the name if it exists.
## Examples
iex> Phoenix.Naming.unsuffix("MyApp.User", "View")
"MyApp.User"
iex> Phoenix.Naming.unsuffix("MyApp.UserView", "View")
"MyApp.User"
"""
@spec unsuffix(String.Chars.t, String.t) :: String.t
def unsuffix(value, "") do
to_string(value)
end
def unsuffix(value, suffix) do
string = to_string(value)
suffix_size = byte_size(suffix)
prefix_size = byte_size(string) - suffix_size
case string do
<<prefix::binary-size(prefix_size), ^suffix::binary>> -> prefix
_ -> string
end
end
@doc """
Converts String to underscore case.
## Examples
iex> Phoenix.Naming.underscore("MyApp")
"my_app"
iex> Phoenix.Naming.underscore(:MyApp)
"my_app"
iex> Phoenix.Naming.underscore("my-app")
"my_app"
In general, `underscore` can be thought of as the reverse of
`camelize`, however, in some cases formatting may be lost:
Phoenix.Naming.underscore "SAPExample" #=> "sap_example"
Phoenix.Naming.camelize "sap_example" #=> "SapExample"
"""
@spec underscore(String.Chars.t) :: String.t
def underscore(value) when not is_binary(value) do
underscore(to_string(value))
end
def underscore(""), do: ""
def underscore(<<h, t :: binary>>) do
<<to_lower_char(h)>> <> do_underscore(t, h)
end
defp do_underscore(<<h, t, rest :: binary>>, _) when h in ?A..?Z and not t in ?A..?Z do
<<?_, to_lower_char(h), t>> <> do_underscore(rest, t)
end
defp do_underscore(<<h, t :: binary>>, prev) when h in ?A..?Z and not prev in ?A..?Z do
<<?_, to_lower_char(h)>> <> do_underscore(t, h)
end
defp do_underscore(<<?-, t :: binary>>, _) do
<<?_>> <> do_underscore(t, ?-)
end
defp do_underscore(<< "..", t :: binary>>, _) do
<<"..">> <> underscore(t)
end
defp do_underscore(<<?.>>, _), do: <<?.>>
defp do_underscore(<<?., t :: binary>>, _) do
<<?/>> <> underscore(t)
end
defp do_underscore(<<h, t :: binary>>, _) do
<<to_lower_char(h)>> <> do_underscore(t, h)
end
defp do_underscore(<<>>, _) do
<<>>
end
defp to_lower_char(char) when char in ?A..?Z, do: char + 32
defp to_lower_char(char), do: char
@doc """
Converts String to camel case.
## Examples
iex> Phoenix.Naming.camelize("my_app")
"MyApp"
iex> Phoenix.Naming.camelize(:my_app)
"MyApp"
In general, `camelize` can be thought of as the reverse of
`underscore`, however, in some cases formatting may be lost:
Phoenix.Naming.underscore "SAPExample" #=> "sap_example"
Phoenix.Naming.camelize "sap_example" #=> "SapExample"
"""
@spec camelize(String.Chars.t) :: String.t
def camelize(value) when not is_binary(value) do
camelize(to_string(value))
end
def camelize(""), do: ""
def camelize(<<?_, t :: binary>>) do
camelize(t)
end
def camelize(<<h, t :: binary>>) do
<<to_upper_char(h)>> <> do_camelize(t)
end
defp do_camelize(<<?_, ?_, t :: binary>>) do
do_camelize(<< ?_, t :: binary >>)
end
defp do_camelize(<<?_, h, t :: binary>>) when h in ?a..?z do
<<to_upper_char(h)>> <> do_camelize(t)
end
defp do_camelize(<<?_>>) do
<<>>
end
defp do_camelize(<<?/, t :: binary>>) do
<<?.>> <> camelize(t)
end
defp do_camelize(<<h, t :: binary>>) do
<<h>> <> do_camelize(t)
end
defp do_camelize(<<>>) do
<<>>
end
defp to_upper_char(char) when char in ?a..?z, do: char - 32
defp to_upper_char(char), do: char
end