nomsu/examples/sample_game.nom

run file "core.nom"
lua block ".."
    |do -- Use a closure to hide this behind the accessor rules
    |    local relations = setmetatable({}, {__index=function(self,key)
    |        local t = {}
    |        self[key] = t
    |        return t
    |    end})
    |    compiler:def("%key %relation ?", function(_,vars)
    |        return relations[vars.relation][vars.key]
    |    end)
    |    compiler:def("%key %relation = %value", function(_,vars)
    |        relations[vars.relation][vars.key] = vars.value
    |    end)
    |    compiler:def("* %relation = %value", function(_,vars)
    |        local result = {}
    |        for k,v in pairs(relations[vars.relation]) do
    |            if utils.equivalent(v, vars.value) then
    |                table.insert(result, k)
    |            end
    |        end
    |        return result
    |    end)
    |end

rule "set all * %relation = %value":
    for "key" in (* %relation = %value):
        %key %relation = %value

rule "you":
    lua expr "(you or 'Anonymous')"

rule ["make %person %action", "make %person do %action"]:
    lua block [..]
        "do"
        "\n    local old_you = you"
        "\n    you = vars.person"
        "\n    ret = compiler:call('do %', vars.action)"
        "\n    you = old_you"
        "\nend"

say "===================================================="
say "                    NEW GAME"
say "===================================================="
rule "everyone approves %action": yes

rule "with everyone's approval %action":
    if (everyone approves %action):
        do %action
    ..else:
        say "You do not have the will of the people! >:("

restrict "rule % %" to within "with everyone's approval %"
restrict "make % %" to within "with everyone's approval %"
restrict "set all * % = %" to within "with everyone's approval %"
restrict "% % = %" to within "with everyone's approval %"
restrict "restrict % to within %" to within "with everyone's approval %"

with everyone's approval:
    rule "propose %action":
        if ("pending proposal" "is" ?):
            say "Sorry, an action is already pending."
        ..else:
            say "Proposing..."
            "pending proposal" "is" = %action

    rule "unpropose":
        let "pending" = ("pending proposal" "is" ?)
        set all * %pending = (nil)
        "pending proposal" "is" = (nil)


    rule "mark %who as approving %action":
        %who %action = "approved"

    rule "mark %who as rejecting %action":
        %who %action = "rejected"

    rule ["approve", "vote yes", "vote yea"]:
        let "pending" = ("pending proposal" "is" ?)
        if (%pending == (nil)):
            say "Nothing is currently pending!"
            return
        mark (you) as approving %pending
        if (everyone approves %pending):
            say "The motion passes!"
            with everyone's approval %pending
            unpropose
        ..else:
            let "approvers" = (number of (* %pending = "approved"))
            let "num-players" = (number of (players))
            printf [%approvers, "/", %num-players, " players have approved"]

    rule ["reject", "vote no", "vote nay", "veto", "disapprove"]:
        let "pending" = ("pending proposal" "is" ?)
        if (%pending == (nil)):
            say "Nothing is currently pending!"
            return
        mark (you) as rejecting %pending
        unpropose

    rule ["players", "everyone", "everybody", "all players"]:
        * "is a player" = (yes)

    rule "join":
        (you) "is a player" = (yes)
        printf ["Welcome to the game, ", you,"!"]

    allow "unpropose" to use "set all * % = %"
    allow ["join", "mark % as approving %", "mark % as rejecting %", "propose %", "unpropose"] to use "% % = %"
    restrict "unpropose" to within ["approve", "reject"]
    restrict "mark % as approving %" to within ["propose %", "approve"]
    restrict "mark % as rejecting %" to within ["propose %", "reject"]

    rule "everyone approves %action":
        (number of (players)) == (number of (* %action = "approved"))

join

propose:
    say "fart"
approve

propose:
    "democracy" "is possible" = (yes)
    if ("democracy" "is possible" ?):
        say "DEMOCRACY WORKS!!!"
approve

propose:
    rule "fart":
        say "poot"
    say "fart should have been defined"
approve
say "doop"
fart

propose:
    rule "open election %candidates":
        if ("candidates" "are" ?):
            say "An election is already in progress."
        ..else:
            "candidates" "are" = %candidates

    rule "close the election":
        set all * "votes for" = (nil)
        "candidates" "are" = (nil)

    rule "vote for %candidate":
        (you) "votes for" = %candidate
        let "vote-percent" = ((number of (* "votes for" = %candidate)) / (number of (players)))
        printf ["Vote cast. ",%candidate," now has ",(100 * %vote-percent),"% of the votes."]
        if (%vote-percent > 0.5):
            printf ["The winner of the election is:", %candidate]
            close the election

    allow ["open election %", "close the election", "vote for %"] to use ["% % = %"]
    allow ["close the election"] to use ["set all * % = %"]
approve

propose:
    rule "as bill %action":
        if ((you) == "Anonymous"):
            make "bill" do %action
        ..else:
            printf ["Who do you think you are, ", you,"?"]
    allow ["as bill %"] to use ["make % %"]
approve
as bill: join

propose:
    rule "as dave %action":
        if ((you) == "Anonymous"):
            make "dave" do %action
        ..else:
            printf ["Who do you think you are, ", you,"?"]
    allow ["as dave %"] to use ["make % %"]
approve
as bill: approve
as dave: join

open election ["tom", "dick", "harry"]
vote for "dick"
as bill: vote for "dick"

propose:
    rule "take a shit": say "shit taken."

approve
as bill: approve
as dave: approve
take a shit
say "Done."