The ws/0 parser accepts a white space character and is equivalent to the \s regular expression.

Examples

iex> alias Ergo.Context
iex> import Ergo.Terminals
iex> parser = ws()
iex> assert %Context{status: :ok, ast: ?\s, input: "World", index: 1, line: 1, col: 2}= Ergo.parse(parser, " World")

iex> alias Ergo.Context
iex> import Ergo.Terminals
iex> parser = ws()
iex> assert %Context{status: :ok, ast: ?\t, input: "World", index: 1, line: 1, col: 2} = Ergo.parse(parser, "\tWorld")

iex> alias Ergo.Context
iex> import Ergo.Terminals
iex> parser = ws()
iex> assert %Context{status: :ok, ast: ?\n, input: "World", index: 1, line: 2, col: 1} = Ergo.parse(parser, "\nWorld")

iex> alias Ergo.Context
iex> import Ergo.Terminals
iex> parser = ws()
iex> assert %Context{status: {:error, [{:unexpected_char, {1, 1}, "Expected: [| |, |\t|, |\r|, |\n|, |\v|] Actual: |H|"}]}, input: "Hello World"} = Ergo.parse(parser, "Hello World")