require "lib/metaprogramming.nom"
require "lib/utils.nom"
require "lib/control_flow.nom"
require "lib/operators.nom"
require "lib/collections.nom"


compile [say %str] to:
    if ((%str's "type") == "String"):
        "nomsu:writeln(\(%str as lua))"
    ..else:
        "nomsu:writeln(nomsu:stringify(\(%str as lua)))"

compile [do %action] to code:
    if ((%action's "type") == "Thunk"):
        %action as lua statements
    ..else:
        "(\(%action as lua))(nomsu, vars);"

# With statement
compile [with %assignments %action] to code:
    %data = []
    for %i = %assignment in (%assignments' "value"):
        %tokens = (%assignment's "value")
        %var = (%tokens -> 1)
        %eq = (%tokens -> 2)
        assert (=lua "vars.eq and vars.eq.type == 'Word' and vars.eq.value == '='") ".."
            Invalid format for 'with' statement. List entries must have the form %var = (value)
        %value = (%tokens -> 3)
        add {i=%i, var=%var, value=%value} to %data
    %foo = (..)
        join (..)
            "local old_value\(%->"i") = \((%->"var") as lua); \((%->"var") as lua) = \((%->"value") as lua);"
            ..for all %data
        ..with glue "\n    "
    ".."
        do
            \(%foo)
            local fell_through = false;
            local ok, ret1, ret2 = pcall(function(nomsu, vars)
                \(%action as lua statements);
                fell_through = true;
            end, nomsu, vars);
            \(join ("\((%->"var") as lua) = old_value\(%->"i");" for all %data) with glue "\n    ")
            if not ok then nomsu:error(ret1); end
            if not fell_through then
                return ret1, ret2;
            end
        end
parse [with %thing = %value %action] as: with [%thing = %value] %action