Bits of code embedded onto my site.

lexer_function.ex

defmodule Lexer do
    def lex(current  \\ 0, tokenstream  \\ [], len, input_str) do
        char = String.at(input_str, current)
        unless current >= len do
            cond do
                ...
            end
        else
            tokenstream
        end
    end

lexer_idea.ex

# Turn this:
# out("Hello World!")
# into this
[
    {"out", :identifier},
    {"(", :oparen},
    {"Hello World!", :string},
    {")", :cparen}
]