Moved core into lib/ and recompiled.

1 files changed, 626 insertions, 0 deletions

diff --git a/lib/core.nom b/lib/core.nom
new file mode 100644
index 0000000..54f728d
--- /dev/null
+++ b/lib/core.nom
@@ -0,0 +1,626 @@
+# Rule for making rules
+lua block ".."
+    |compiler:defmacro("rule %spec = %body", function(compiler, vars, kind)
+    |    if kind == "Expression" then
+    |        compiler:error("Cannot use rule definitions as an expression.")
+    |    end
+    |    local spec = compiler:get_invocations_from_definition(vars.spec.value, vars)
+    |    return ("compiler:def("..compiler.utils.repr(spec,true)..", "..compiler:tree_to_lua(vars.body, vars)..")"), true
+    |end)
+
+rule: help %invocation ..=:
+    lua block ".."
+        |local fn_info = compiler.defs[vars.invocation]
+        |if not fn_info then
+        |    compiler:writeln("Function not found: "..compiler.utils.repr(vars.invocation, true))
+        |else
+        |    compiler:writeln("rule "..compiler.utils.repr(fn_info.invocations).." ="..(fn_info.src or ":\\n    <unknown source code>"))
+        |end
+
+# Macros
+lua block ".."
+    |local add_macro = function(compiler, vars, kind)
+    |    local spec = compiler:get_invocations_from_definition(vars.spec.value, vars)
+    |    local fn = compiler:tree_to_value(vars.body, vars)
+    |    compiler:defmacro(spec, fn, vars.body.src)
+    |    return "", true
+    |end
+    |compiler:defmacro("macro %spec = %body", add_macro)
+    |
+    |local add_macro_block = function(compiler, vars, kind)
+    |    local spec = compiler:get_invocations_from_definition(vars.spec.value, vars)
+    |    local fn = compiler:tree_to_value(vars.body, vars)
+    |    local wrapper = function(compiler, vars, kind)
+    |        if kind == "Expression" then
+    |            compiler:error("Macro: "..spec.." was defined to be a block, but is being used as an expression.")
+    |        end
+    |        return ("do\\n"..fn(compiler, vars, kind).."\\nend"), true
+    |    end
+    |    compiler:defmacro(spec, wrapper, vars.body.src)
+    |    return "", true
+    |end
+    |compiler:defmacro("macro block %spec = %body", add_macro_block)
+
+# Compiler tools
+rule:
+    eval %code
+    run %code
+..=:
+    lua expr "compiler:run(vars.code)"
+
+macro: source code %code ..=:
+    lua block ".."
+        |if vars.code.value.type ~= "Thunk" then
+        |    compiler:error("'source code %' only takes code blocks, not "..vars.code.value.type)
+        |end
+    lua expr "compiler.utils.repr(vars.code.value.value.src, true)"
+
+rule: run file %filename ..=:
+    lua block ".."
+        |local file = io.open(vars.filename)
+        |return compiler:run(file:read("*a"))
+
+# Error functions
+rule: error! ..=:
+    lua block ".."
+        |table.remove(compiler.callstack)
+        |compiler:error()
+
+rule: error %msg ..=:
+    lua block ".."
+        |table.remove(compiler.callstack)
+        |compiler:error(vars.msg)
+
+macro: as lua %block ..=:
+    lua expr "compiler.utils.repr(compiler:tree_to_lua(vars.block.value.value, vars), true)"
+
+macro block: show generated lua %block ..=:
+    ".."|compiler:writeln(\lua expr "compiler.utils.repr(compiler:tree_to_lua(vars.block.value.value, vars), true)"\)
+
+# Macro helper functions
+rule: %tree as value ..=:
+    lua expr ".."
+        |compiler:tree_to_value(vars.tree, vars)
+
+rule: %tree as lua block ..=:
+    lua block ".."
+        |return compiler:tree_to_lua(vars.tree, 'Statement'), true
+
+rule: %tree as lua expr ..=:
+    lua expr ".."
+        |compiler:tree_to_lua(vars.tree, 'Expression')
+
+# Moonscript!
+macro block: moonscript block %moonscript_code ..=:
+    lua block ".."
+        |local parse, compile = require('moonscript.parse'), require('moonscript.compile')
+        |local moon_code = compiler:tree_to_value(vars.moonscript_code, vars)
+        |local tree, err = parse.string(moon_code)
+        |if not tree then
+        |    compiler:error("Failed to parse moonscript: "..err)
+        |end
+        |local lua_code, err, pos = compile.tree(tree)
+        |if not lua_code then
+        |    compiler:error(compile.format_error(err, pos, moon_code))
+        |end
+        |return "do\\n"..lua_code.."\\nend"
+
+macro: moonscript %moonscript_code ..=:
+    lua block ".."
+        |local parse, compile = require('moonscript.parse'), require('moonscript.compile')
+        |local moon_code = compiler:tree_to_value(vars.moonscript_code, vars)
+        |local tree, err = parse.string(moon_code)
+        |if not tree then
+        |    compiler:error("Failed to parse moonscript: "..err)
+        |end
+        |local lua_code, err, pos = compile.tree(tree)
+        |if not lua_code then
+        |    compiler:error(compile.format_error(err, pos, moon_code))
+        |end
+        |return "(function(compiler, vars)\\n"..lua_code.."\\nend)(compiler, vars)"
+
+# String functions
+rule: join %strs ..=:
+    lua block ".."
+        |local str_bits = {}
+        |for i,bit in ipairs(vars.strs) do str_bits[i] = compiler.utils.repr(bit) end
+        |return table.concat(str_bits)
+
+rule: join %strs with glue %glue ..=:
+    lua block ".."
+        |local str_bits = {}
+        |for i,bit in ipairs(vars.strs) do str_bits[i] = compiler.utils.repr(bit) end
+        |return table.concat(str_bits, vars.glue)
+
+rule:
+    capitalize %str
+    %str capitalized
+..=:
+    lua expr ".."|vars.str:gsub("%l", string.upper, 1)
+
+# Variable assignment
+#..
+    macro block: %var = %value ..=:
+        lua block ".."
+            |if vars.var.value.type ~= "Var" then
+            |    compiler:error("Assignment operation has the wrong type for the left hand side. "
+            |        .."Expected Var, but got: "..vars.var.value.type)
+            |end
+        ".."|\%var as lua expr\ = \%value as lua expr\
+
+lua block ".."
+    |local function helper(callback)
+    |    return function(compiler, vars, kind)
+    |        if kind == "Expression" then
+    |            compiler:error("Cannot use an assignment operation as an expression value.")
+    |        end
+    |        if vars.var.value.type ~= "Var" then
+    |            compiler:error("Assignment operation has the wrong type for the left hand side. "
+    |                .."Expected Var, but got: "..vars.var.value.type)
+    |        end
+    |        if vars.value.value.type ~= "Thunk" then
+    |            compiler:error("Assignment operation has the wrong type for the right hand side. "
+    |                .."Expected Thunk, but got: "..vars.value.value.type.."\\nMaybe you used '=' instead of '=:'?")
+    |        end
+    |        local ret = "do\\n    local ret"
+    |        ret = ret .. "\\n    "..compiler:tree_to_lua(vars.value.value.value, "Statement")
+    |        ret = ret .. "\\n    "..callback(compiler:tree_to_lua(vars.var, "Expression"))
+    |        return (ret.."\\nend"), true
+    |    end
+    |end
+    |compiler:defmacro("%var = %value", helper(function(var) return var.." = ret" end))
+    |compiler:defmacro("%var += %value", helper(function(var) return var.." = "..var.." + ret" end))
+    |compiler:defmacro("%var -= %value", helper(function(var) return var.." = "..var.." - ret" end))
+    |compiler:defmacro("%var *= %value", helper(function(var) return var.." = "..var.." * ret" end))
+    |compiler:defmacro("%var /= %value", helper(function(var) return var.." = "..var.." / ret" end))
+    |compiler:defmacro("%var ^= %value", helper(function(var) return var.." = "..var.." ^ ret" end))
+    |compiler:defmacro("%var and= %value", helper(function(var) return var.." = "..var.." and ret" end))
+    |compiler:defmacro("%var or= %value", helper(function(var) return var.." = "..var.." or ret" end))
+    |compiler:defmacro("%var concat= %value", helper(function(var) return var.." = "..var.." .. ret" end))
+    |compiler:defmacro("%var mod= %value", helper(function(var) return var.." = "..var.." % ret" end))
+
+# Operators
+macro:
+    true
+    yes
+..=: "true"
+macro:
+    false
+    no
+..=: "false"
+macro:
+    nil
+    null
+..=: "nil"
+macro block:
+    nop
+    pass
+..=: ""
+macro: %a + %b ..=: ".."|(\%a as lua expr\ + \%b as lua expr\)
+macro: %a + %b + %c ..=: ".."|(\%a as lua expr\ + \%b as lua expr\ + \%c as lua expr\)
+macro: %a + %b + %c + %d ..=: ".."|(\%a as lua expr\ + \%b as lua expr\ + \%c as lua expr\ + \%d as lua expr\)
+macro: %a - %b ..=: ".."|(\%a as lua expr\ - \%b as lua expr\)
+macro: %a * %b ..=: ".."|(\%a as lua expr\ * \%b as lua expr\)
+macro: %a * %b * %c ..=: ".."|(\%a as lua expr\ * \%b as lua expr\ * \%c as lua expr\)
+macro: %a * %b * %c * %d ..=: ".."|(\%a as lua expr\ * \%b as lua expr\ * \%c as lua expr\ * \%d as lua expr\)
+macro: %a / %b ..=: ".."|(\%a as lua expr\ / \%b as lua expr\)
+macro: %a === %b ..=: ".."|(\%a as lua expr\ == \%b as lua expr\)
+macro: %a !== %b ..=: ".."|(\%a as lua expr\ ~= \%b as lua expr\)
+macro: %a < %b ..=: ".."|(\%a as lua expr\ < \%b as lua expr\)
+macro: %a < %b < %c ..=: ".."|((\%a as lua expr\ < \%b as lua expr\) and (\%b as lua expr\ < \%c as lua expr\))
+macro: %a <= %b < %c ..=: ".."|((\%a as lua expr\ <= \%b as lua expr\) and (\%b as lua expr\ < \%c as lua expr\))
+macro: %a <= %b <= %c ..=: ".."|((\%a as lua expr\ <= \%b as lua expr\) and (\%b as lua expr\ <= \%c as lua expr\))
+macro: %a < %b <= %c ..=: ".."|((\%a as lua expr\ < \%b as lua expr\) and (\%b as lua expr\ <= \%c as lua expr\))
+macro: %a > %b > %c ..=: ".."|((\%a as lua expr\ > \%b as lua expr\) and (\%b as lua expr\ > \%c as lua expr\))
+macro: %a >= %b > %c ..=: ".."|((\%a as lua expr\ >= \%b as lua expr\) and (\%b as lua expr\ > \%c as lua expr\))
+macro: %a >= %b >= %c ..=: ".."|((\%a as lua expr\ >= \%b as lua expr\) and (\%b as lua expr\ >= \%c as lua expr\))
+macro: %a > %b >= %c ..=: ".."|((\%a as lua expr\ > \%b as lua expr\) and (\%b as lua expr\ >= \%c as lua expr\))
+macro: %a <= %b ..=: ".."|(\%a as lua expr\ <= \%b as lua expr\)
+macro: %a > %b ..=: ".."|(\%a as lua expr\ > \%b as lua expr\)
+macro: %a >= %b ..=: ".."|(\%a as lua expr\ >= \%b as lua expr\)
+macro: %a ^ %b ..=: ".."|(\%a as lua expr\ ^ \%b as lua expr\)
+macro: %a and %b ..=: ".."|(\%a as lua expr\ and \%b as lua expr\)
+macro: %a and %b and %c ..=:
+    ".."|(\%a as lua expr\ and \%b as lua expr\ and \%c as lua expr\)
+macro: %a and %b and %c and %d ..=:
+    ".."|(\%a as lua expr\ and \%b as lua expr\ and \%c as lua expr\ and \%d as lua expr\)
+macro: %a or %b ..=: ".."|(\%a as lua expr\ or \%b as lua expr\)
+macro: %a or %b or %c ..=:
+    ".."|(\%a as lua expr\ or \%b as lua expr\ or \%c as lua expr\)
+macro: %a or %b or %c or %d ..=:
+    ".."|(\%a as lua expr\ or \%b as lua expr\ or \%c as lua expr\ or \%d as lua expr\)
+macro: %a mod %b ..=: ".."|(\%a as lua expr\ mod \%b as lua expr\)
+macro: - %a ..=: ".."|-(\%a as lua expr\)
+macro: not %a ..=: ".."|not (\%a as lua expr\)
+
+rule: %a == %b ..=:
+    lua expr "((vars.a == vars.b) or compiler.utils.equivalent(vars.a, vars.b))"
+rule: %a != %b ..=:
+    lua expr "((vars.a ~= vars.b) or not compiler.utils.equivalent(vars.a, vars.b))"
+
+macro: repr %obj ..=:
+    ".."|compiler.utils.repr(\%obj as lua expr\, true)
+
+macro: say %str ..=:
+    ".."|compiler:writeln(compiler.utils.repr(\%str as lua expr\))
+
+# Control flow
+rule: do %action ..=:
+    lua expr "vars.action(compiler, setmetatable({}, {__index=vars}))"
+
+macro block: return %return_value ..=:
+    lua block ".."
+        |if vars.return_value.value.type ~= "Thunk" then
+        |    compiler:error("Assignment operation has the wrong type for the right hand side. "
+        |        .."Expected Thunk, but got: "..vars.return_value.value.type.."\\nMaybe you used '=' instead of '=:'?")
+        |end
+    ".."|do
+        |    local ret
+        |    \lua expr "compiler:tree_to_lua(vars.return_value.value.value, 'Statement')"\
+        |    return ret
+        |end
+
+macro block: return ..=:
+    "return nil"
+
+# Conditionals
+macro block: if %condition %if_body ..=:
+    ".."|if \%condition as lua expr\ then
+        |    \(lua expr "vars.if_body.value.value") as lua block\
+        |end
+
+macro block: if %condition %if_body else %else_body ..=:
+    ".."|if \%condition as lua expr\ then
+        |    \(lua expr "vars.if_body.value.value") as lua block\
+        |else
+        |    \(lua expr "vars.else_body.value.value") as lua block\
+        |end
+
+# Ternary operator
+macro: %if_expr if %condition else %else_expr ..=:
+    ".."|(function(compiler, vars)
+        |    if \%condition as lua expr\ then
+        |        return \%if_expr as lua expr\
+        |    else
+        |        return \%else_expr as lua expr\
+        |    end
+        |end)(compiler, vars)
+
+# Loop control flow
+macro block: break ..=: "break"
+macro block: continue ..=: "continue"
+# TODO: add labeled break/continue?
+
+# GOTOs
+lua block ".."
+    |local function lua_label(label)
+    |    if label.type ~= "Var" then
+    |        compiler:error("Goto label has the wrong type for the label. Expected Var, but got: "..label.type)
+    |    end
+    |    local bits = "abcdefghijklmnop"
+    |    local lua_identifier = "label_"
+    |    for i=1,#label.value do
+    |        local byte = string.byte(label.value, i)
+    |        local low = byte % 16
+    |        local high = (byte - low) / 16
+    |        lua_identifier = lua_identifier .. bits:sub(low+1,low+1) .. bits:sub(high+1,high+1)
+    |    end
+    |    return lua_identifier
+    |end
+    |
+    |compiler:defmacro("-> %label", function(compiler, vars, kind)
+    |    return "::"..lua_label(vars.label.value).."::", true
+    |end)
+    |compiler:defmacro("go to %label", function(compiler, vars, kind)
+    |    return "goto "..lua_label(vars.label.value), true
+    |end)
+
+# While loops
+macro block: repeat %body ..=:
+    ".."|while true do
+        |    \(lua expr "vars.body.value.value") as lua block\
+        |end
+macro block: repeat while %condition %body ..=:
+    ".."|while \%condition as lua expr\ do
+        |    \(lua expr "vars.body.value.value") as lua block\
+        |end
+macro block: repeat until %condition %body ..=:
+    ".."|while not (\%condition as lua expr\) do
+        |    \(lua expr "vars.body.value.value") as lua block\
+        |end
+
+# For loops
+macro block: for %var in %iterable %body ..=:
+    %var-type =: lua expr "vars.var.value.type"
+    if (%var-type != "Var"):
+        error ".."
+            |For loop has the wrong type for the loop variable. Expected Var, but got: \%var-type\
+    %var-code =: %var as lua expr
+    ".."|local old_loopval = \%var-code\
+        |for i,value in ipairs(\%iterable as lua expr\) do
+        |    \%var-code\ = value
+        |    \(lua expr "vars.body.value.value") as lua block\
+        |end
+        |\%var-code\ = old_loopval
+
+macro block: for all %iterable %body ..=:
+    ".."|local old_loopval = vars.it
+        |for i,value in ipairs(\%iterable as lua expr\) do
+        |    vars.it = value
+        |    \(lua expr "vars.body.value.value") as lua block\
+        |end
+        |vars.it = old_loopval
+
+# List Comprehension
+# TODO: maybe make this lazy, or a lazy version?
+macro: %expression for %var in %iterable ..=:
+    %var-type =: lua expr "vars.var.value.type"
+    if (%var-type != "Var"):
+        error ".."
+            |List comprehension has the wrong type for the loop variable. Expected Var, but got: \%var-type\
+    %var-code =: %var as lua expr
+    ".."|(function(game, vars)
+        |    local comprehension = {}
+        |    for i,value in ipairs(\%iterable as lua expr\) do
+        |        \%var-code\ = value
+        |        comprehension[i] = \%expression as lua expr\
+        |    end
+        |    return comprehension
+        |end)(game, setmetatable({}, {__index=vars}))
+
+macro: %expression for all %iterable ..=:
+    ".."|(function(game, vars)
+        |    local comprehension = {}
+        |    for i,value in ipairs(\%iterable as lua expr\) do
+        |        vars.it = value
+        |        comprehension[i] = \%expression as lua expr\
+        |    end
+        |    return comprehension
+        |end)(game, setmetatable({}, {__index=vars}))
+
+# Dict comprehension
+macro: %key -> %value for %var in %iterable ..=:
+    %var-type =: lua expr "vars.var.value.type"
+    if (%var-type != "Var"):
+        error ".."
+            |Dict comprehension has the wrong type for the loop variable. Expected Var, but got: \%var-type\
+    %var-code =: %var as lua expr
+    ".."|(function(game, vars)
+        |    local comprehension = {}
+        |    for i,value in ipairs(\%iterable as lua expr\) do
+        |        \%var-code\ = value
+        |        comprehension[\%key as lua expr\] = \%value as lua expr\
+        |    end
+        |    return comprehension
+        |end)(game, setmetatable({}, {__index=vars}))
+
+macro: %key -> %value for all %iterable ..=:
+    ".."|(function(game, vars)
+        |    local comprehension = {}
+        |    for i,value in ipairs(\%iterable as lua expr\) do
+        |        vars.it = value
+        |        comprehension[\%key as lua expr\] = \%value as lua expr\
+        |    end
+        |    return comprehension
+        |end)(game, setmetatable({}, {__index=vars}))
+
+# Number ranges
+rule: %start up to %stop ..=:
+    lua expr "compiler.utils.range(vars.start,vars.stop-1)"
+
+rule:
+    %start thru %stop
+    %start through %stop
+..=:
+    lua expr "compiler.utils.range(vars.start,vars.stop)"
+
+rule: %start down to %stop ..=:
+    lua expr "compiler.utils.range(vars.start,vars.stop+1,-1)"
+
+rule:
+    %start down thru %stop
+    %start down through %stop
+..=:
+    lua expr "compiler.utils.range(vars.start,vars.stop,-1)"
+
+rule: %start up to %stop via %step ..=:
+    lua expr "compiler.utils.range(vars.start,vars.stop-1,vars.step)"
+
+rule:
+    %start thru %stop via %step
+    %start through %stop via %step
+..=:
+    lua expr "compiler.utils.range(vars.start,vars.stop,vars.step)"
+
+rule: %start down to %stop via %step ..=:
+    lua expr "compiler.utils.range(vars.start,vars.stop+1,-vars.step)"
+
+rule:
+    %start down thru %stop via %step
+    %start down through %stop via %step
+..=:
+    lua expr "compiler.utils.range(vars.start,vars.stop,-vars.step)"
+
+# Common utility functions
+rule: random number ..=: lua expr "math.random()"
+rule: sum of %items ..=: lua expr "compiler.utils.sum(vars.items)"
+rule: product of %items ..=: lua expr "compiler.utils.product(vars.items)"
+rule: all of %items ..=: lua expr "compiler.utils.all(vars.items)"
+rule: any of %items ..=: lua expr "compiler.utils.any(vars.items)"
+rule:
+    avg of %items
+    average of %items
+..=: lua expr "(compiler.utils.sum(vars.items)/#vars.items)"
+rule:
+    min of %items
+    smallest of %items
+    lowest of %items
+..=:
+    lua expr "compiler.utils.min(vars.items)"
+rule:
+    max of %items
+    biggest of %items
+    largest of %items
+    highest of %items
+..=:
+    lua expr "compiler.utils.min(vars.items)"
+
+rule: min of %items with respect to %keys ..=:
+    lua expr "compiler.utils.min(vars.items, vars.keys)"
+rule: max of %items with respect to %keys ..=:
+    lua expr "compiler.utils.max(vars.items, vars.keys)"
+
+# List/dict functions
+macro:
+    %list's %index
+    %index st in %list
+    %index nd in %list
+    %index rd in %list
+    %index th in %list
+    %index in %list
+    %list -> %index
+..=:
+    ".."|\%list as lua expr\[\%index as lua expr\]
+
+macro block:
+    %list's %index = %value
+    %index st in %list = %value
+    %index nd in %list = %value
+    %index rd in %list = %value
+    %index th in %list = %value
+    %index in %list = %value
+    %list -> %index = %value
+..=:
+    lua block ".."
+        |if vars.value.value.type ~= "Thunk" then
+        |    compiler:error("Dict assignment operation has the wrong type for the right hand side. "
+        |        .."Expected Thunk, but got: "..vars.value.value.type.."\\nMaybe you used '=' instead of '=:'?")
+        |end
+    ".."|do
+        |    local ret
+        |    \lua expr "compiler:tree_to_lua(vars.value.value.value, 'Statement')"\
+        |    \%list as lua expr\[\%index as lua expr\] = ret
+        |end
+
+macro:
+    append %item to %list
+    add %item to %list
+..=:
+    ".."|table.insert(\%list as lua expr\, \%item as lua expr\)
+
+rule: flatten %lists ..=:
+    %flat =: []
+    for %list in %lists:
+        for %item in %list:
+            add %item to %flat
+    %flat
+
+macro:
+    %item is in %list
+    %list contains %item
+..=:
+    ".."|(\%list as lua expr\[\%index as lua expr\] ~= nil)
+
+macro:
+    length of %list
+    size of %list
+    number of %list
+..=:
+    ".."|#(\%list as lua expr\)
+
+rule: dict %items ..=:
+    %dict =: []
+    for %pair in %items:
+        lua block "vars.dict[vars.pair[1]] = vars.pair[2]"
+    return: %dict
+
+rule: entries in %dict ..=:
+    lua block ".."
+        |local items = {}
+        |for k,v in pairs(vars.dict) do
+        |    table.insert(items, {key=k,value=v})
+        |end
+        |return items
+
+# Permission functions
+rule: restrict %fn to within %whitelist ..=:
+    lua block ".."
+        |local fns = compiler:get_invocations(vars.fn)
+        |local whitelist = compiler:get_invocations(vars.whitelist)
+        |local whiteset = {}
+        |for _,w in ipairs(whitelist) do
+        |    if not compiler.defs[w] then
+        |        compiler:error("Undefined function: "..tostring(w))
+        |    else whiteset[w] = true
+        |    end
+        |end
+        |for _,fn in ipairs(fns) do
+        |    local fn_info = compiler.defs[fn]
+        |    if fn_info == nil then
+        |        compiler:error("Undefined function: "..tostring(fn))
+        |    elseif not compiler:check_permission(fn) then
+        |        compiler:writeln("You do not have permission to restrict function: "..tostring(fn))
+        |    else
+        |        compiler.defs[fn].whiteset = whiteset
+        |    end
+        |end
+
+rule: allow %whitelist to use %fn ..=:
+    lua block ".."
+        |local fns = compiler:get_invocations(vars.fn)
+        |local whitelist = compiler:get_invocations(vars.whitelist)
+        |for _,w in ipairs(whitelist) do
+        |    if not compiler.defs[w] then
+        |        compiler:error("Undefined function: "..tostring(w))
+        |    end
+        |end
+        |for _,fn in ipairs(fns) do
+        |    local fn_info = compiler.defs[fn]
+        |    if fn_info == nil then
+        |        compiler:error("Undefined function: "..tostring(fn))
+        |    elseif fn_info.whiteset == nil then
+        |        compiler:writeln("Function is already allowed by everyone: "..tostring(fn))
+        |    elseif not compiler:check_permission(fn) then
+        |        compiler:writeln("You do not have permission to grant permissions for function: "..tostring(fn))
+        |    else
+        |        for _,w in ipairs(whitelist) do
+        |            fn_info.whiteset[w] = true
+        |        end
+        |    end
+        |end
+
+rule: forbid %blacklist to use %fn ..=:
+    lua block ".."
+        |local fns = compiler:get_invocations(vars.fn)
+        |local blacklist = compiler:get_invocations(vars.blacklist)
+        |for _,b in ipairs(blacklist) do
+        |    if not compiler.defs[b] then
+        |        compiler:error("Undefined function: "..tostring(b))
+        |    end
+        |end
+        |for _,fn in ipairs(fns) do
+        |    local fn_info = compiler.defs[fn]
+        |    if fn_info == nil then
+        |        compiler:error("Undefined function: "..tostring(fn))
+        |    elseif fn_info.whiteset == nil then
+        |        compiler:writeln("Cannot remove items from a whitelist when there is no whitelist on function: "..tostring(fn))
+        |    elseif not compiler:check_permission(fn) then
+        |        compiler:writeln("You do not have permission to restrict function: "..tostring(fn))
+        |    else
+        |        for _,b in ipairs(blacklist) do fn_info.whiteset[b] = nil end
+        |    end
+        |end
+
+# For unit testing
+macro block: test %code yields %expected ..=:
+    %generated =: lua expr "compiler.utils.repr(compiler:stringify_tree(vars.code.value.value), true)"
+    %expected =: %expected as lua expr
+    if (%generated != %expected):
+        say "Test failed!"
+        say "Expected:"
+        say %expected
+        say "But got:"
+        say %generated
+        error!
+    return: ""
+