#
    This file contains a set of definitions that bring some familiar language features
    from other languages into nomsu (e.g. "==" and "continue")

use "core"

parse [%a = %b] as: %a <- %b
parse [%a == %b] as: %a is %b
parse [%a ~= %b, %a != %b, %a <> %b] as: %a is not %b
parse [%a === %b] as: (%a's id) is (%b's id)
parse [%a !== %b] as: (%a's id) is not (%b's id)
parse [%a mod %b] as: %a wrapped around %b
parse [function %names %body, def %names %body] as: action %names %body
parse [switch %branch_value %body] as: when %branch_value = ? %body
parse [None, Null] as: nil
parse [True, true] as: yes
parse [False, false] as: no
parse [pass] as: do nothing
parse [%a || %b] as: %a or %b
parse [%a && %b] as: %a and %b
parse [continue] as: do next
parse [break] as: stop
parse [let %thing = %value in %action] as: with [%thing <- %value] %action
parse [print %] as: say %
parse [error!, panic!, fail!, abort!] as: barf!
parse [error %, panic %, fail %, abort %] as: barf %
parse [assert %condition %message] as: assume %condition or barf %message
parse [%cond ? %if_true %if_false] as: %if_true if %cond else %if_false
compile [function %args %body, lambda %args %body] to
    %lua <-: Lua value "(function("
    for %i = %arg in %args.value
        if: %i > 1
            to %lua write ", "
        to %lua write: %arg as lua expr
    to %lua write ")\n    "
    %body <-: %body as lua
    lua> "\%body:convert_to_statements('return ');"
    for % in %args.value: lua> "\%body:remove_free_vars(\%);"
    to %lua write %body
    to %lua write "\nend)"
    return %lua
parse [function %name %args %body] as: %name <- (function %args %body)
compile [call %fn %args] to
    Lua value "\(%fn as lua expr)(unpack(\(%args as lua expr)))"