176 lines
7.7 KiB
Plaintext
176 lines
7.7 KiB
Plaintext
use "core"
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compile [@] to: Lua value "self"
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compile [@%var] to
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lua> ".."
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local key_lua = repr(\%var.value);
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local key_attr = (key_lua:match("'([a-zA-Z][a-zA-Z0-9]*)'")
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or key_lua:match('"([a-zA-Z][a-zA-Z0-9]*)"'));
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if key_attr then
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return Lua.value(tree.source, "self."..key_attr);
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elseif key_lua:sub(1,1) == "[" then
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key_lua = " "..key_lua;
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end
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return Lua.Value(tree.source, "self["..key_lua.."]");
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compile [@%var <- %val] to
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lua> ".."
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local val_lua = \(%val as lua expr);
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local key_lua = repr(\%var.value);
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local key_attr = (key_lua:match("'([a-zA-Z][a-zA-Z0-9]*)'")
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or key_lua:match('"([a-zA-Z][a-zA-Z0-9]*)"'));
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if key_attr then
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return Lua(tree.source, "self.", key_attr, " = ", val_lua, ";");
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elseif key_lua:sub(1,1) == "[" then
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key_lua = " "..key_lua.." ";
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end
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return Lua(tree.source, "self[", key_lua, "] = ", val_lua, ";");
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compile [as %instance %body] to
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%body_lua <- (%body as lua)
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lua> "\%body_lua:convert_to_statements();"
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return
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Lua ".."
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do
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local self = \(%instance as lua expr);
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local global_actions = ACTIONS;
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local ACTIONS = setmetatable({}, {__index=function(_,key)
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local method = self[key];
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if method then return (function(...) return method(self, ...); end); end
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return global_actions[key];
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end});
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\%body_lua
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end
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compile [define object %classname %class_body] to
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%class_identifier <- (=lua "nomsu:var_to_lua_identifier(\(%classname as value)):sub(2,-1)")
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if: %class_identifier is ""
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%class_identifier <- "class"
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%methods <- []
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%__index <- %class_identifier
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%__newindex <- "nil"
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for %line in (%class_body's "value")
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if: (%line's "type") is "Comment"
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do next %line
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if: ((%line's "type") is "FunctionCall") and ((%line's stub) is "slots %")
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%slot_index_clauses <- []
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%slot_newindex_clauses <- []
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%slots <- %line.value.2.value
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for %slot_index = %slot_var in %slots
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to %slot_index_clauses add ".."
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if key == \(repr (%slot_var's "value")) or key == \(repr (%slot_var as lua expr)) then
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return rawget(self, \%slot_index);
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end
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to %slot_newindex_clauses add ".."
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if key == \(repr (%slot_var's "value")) or key == \(repr (%slot_var as lua expr)) or key == \%slot_index then
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rawset(self, \%slot_index, value);
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end
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%__index <- ".."
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function(self, key)
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\(%slot_index_clauses joined with "\n")
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return \%class_identifier[key];
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end
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%__newindex <- ".."
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function(self, key, value)
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\(%slot_newindex_clauses joined with "\n")
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error("Attempt to store data in "..repr(key)..", which is not a valid slot on "..tostring(self.class));
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end
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do next %line
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assume ((%line.type is "FunctionCall") and ((%line's stub) is "action % %"))
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..or barf "Only action definitions are supported inside 'define object % %', not \(%line's "src")"
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%actions <- %line.value.2
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%body <- %line.value.3
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lua> ".."
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do
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local stubs = {};
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for i, action in ipairs(\%actions.value) do
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stubs[i] = nomsu:tree_to_named_stub(action);
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end
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local args = {};
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for i,tok in ipairs(\%actions.value[1].value) do
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if tok.type == "Var" then args[#args+1] = nomsu:var_to_lua_identifier(tok.value); end
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end
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local arg_set = {};
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for i, arg in ipairs(args) do arg_set[arg] = true; end
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local body_lua = nomsu:tree_to_lua(\%body);
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body_lua:convert_to_statements();
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body_lua:declare_locals();
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local lua_fn_args = table.concat({"self", unpack(args)}, ", ");
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local def_tree = nomsu.compilestack[#nomsu.compilestack];
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local compiled_args = {};
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for i, arg in ipairs(args) do
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compiled_args[i] = "nomsu:tree_to_lua("..arg..")";
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end
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compiled_args = table.concat(compiled_args, "..', '..");
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table.insert(\%methods, ([==[
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%s[ %s] = function(%s)
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%s
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end
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]==]):format(
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\%class_identifier, repr(stubs[1]), lua_fn_args,
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body_lua));
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end
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return
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Lua ".."
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do -- \%class_identifier
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-- Create the class object
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local \%class_identifier = setmetatable({
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name=\(%classname as lua expr), instances=setmetatable({}, {__mode="k"}),
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}, {
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__tostring=function(c) return c.name; end,
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__call=function(cls, initial_values)
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local inst = setmetatable({}, cls.instance_metatable);
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for k,v in pairs(initial_values) do inst[k] = v; end
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cls.instances[inst] = true;
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if inst['set % up'] then
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inst['set % up'](inst);
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end
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return inst;
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end,
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});
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\%class_identifier.class = \%class_identifier;
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-- Define the methods
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\(%methods joined with "\n")
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-- Define class methods for instantiating and accessing instances
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\%class_identifier.instance_metatable = {
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__index=\%__index,
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__newindex=\%__newindex,
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__tostring=\%class_identifier['as text'] or function(inst)
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return "<"..inst.class.name..": "..nomsu.ids[inst]..">";
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end,
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__len=\%class_identifier['size of'],
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__unm=\%class_identifier['-'],
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__add=\%class_identifier['+ %'],
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__sub=\%class_identifier['- %'],
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__mul=\%class_identifier['* %'],
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__div=\%class_identifier['/ %'],
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__mod=\%class_identifier['wrapped around %'],
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__pow=\%class_identifier['^ %'],
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__band=\%class_identifier['AND %'],
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__bor=\%class_identifier['OR %'],
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__bxor=\%class_identifier['XOR %'],
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__bshl=\%class_identifier['<< %'],
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__bshr=\%class_identifier['>> %'],
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__eq=\%class_identifier['= %'],
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__lt=\%class_identifier['< %'],
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__le=\%class_identifier['<= %'],
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};
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nomsu:define_action("instances of "..\%class_identifier.name, "lib/class.nom", function(__callsite)
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return utils.keys(\%class_identifier.instances);
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end, "");
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nomsu:define_action("new "..\%class_identifier.name.." %instance", "lib/class.nom", function(__callsite, _instance)
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return \%class_identifier(_instance);
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end, "");
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nomsu:define_action("new "..\%class_identifier.name, "lib/class.nom", function(__callsite)
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return \%class_identifier({});
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end, "");
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end -- End of definition of \%class_identifier
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\("\n\n")
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