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#..
This File contains actions for making actions and compile-time actions and some helper
functions to make that easier.
# Compile-time action to make compile-time actions:
immediately:
lua> ".."
nomsu:define_compile_action("compile %actions to %lua", \(!! code location !!), function(tree, \%actions, \%lua)
local lua = Lua(tree.source, "nomsu:define_compile_action(");
local stubs = {};
for i, action in ipairs(\%actions.value) do
stubs[i] = action:get_stub(true);
end
lua:append(repr(stubs), ", ", repr(tree.source:get_line()), ", function(tree");
local args = {};
for i,tok in ipairs(\%actions.value[1].value) do
if tok.type == "Var" then args[#args+1] = nomsu:var_to_lua_identifier(tok.value); end
end
if \%lua.type == "Text" then
error("Invalid type for 'compile % to %', expected a dict with expr/statements, but got text.", 0);
end
for i, arg in ipairs(args) do
lua:append(", ");
lua:append(arg);
end
local body_lua = \%lua:as_lua(nomsu);
body_lua:convert_to_statements("return ");
body_lua:declare_locals(args);
lua:append(")\\n ", body_lua, "\\nend);")
return lua;
end);
# Compile-time action to make actions
immediately:
compile [action %actions %body] to:
lua> ".."
local lua = Lua(tree.source, "nomsu:define_action(");
local stubs = {};
for i, action in ipairs(\%actions.value) do
stubs[i] = action:get_stub(true);
end
lua:append(repr(stubs), ", ", repr(tree.source:get_line()), ", function(");
local args = {};
for i,tok in ipairs(\%actions.value[1].value) do
if tok.type == "Var" then args[#args+1] = nomsu:var_to_lua_identifier(tok.value); end
end
for i, arg in ipairs(args) do
lua:append(arg);
if i < #args then lua:append(", ") end
end
local body_lua = \%body:as_lua(nomsu);
body_lua:convert_to_statements("return ");
body_lua:declare_locals(args);
lua:append(")\\n ", body_lua, "\\nend);")
return lua;
# Macro to make nomsu macros:
immediately:
compile [parse %shorthand as %longhand] to:
lua> ".."
local lua = Lua(tree.source, "nomsu:define_compile_action(");
local stubs = {};
for i, action in ipairs(\%shorthand.value) do
stubs[i] = action:get_stub(true);
end
lua:append(repr(stubs), ", ", repr(tree.source:get_line()), ", function(tree");
local args = {};
for i,tok in ipairs(\%shorthand.value[1].value) do
if tok.type == "Var" then args[#args+1] = nomsu:var_to_lua_identifier(tok.value); end
end
for i, arg in ipairs(args) do
lua:append(", ");
lua:append(arg);
end
local template;
if \%longhand.type == "Block" then
local lines = {};
for i, line in ipairs(\%longhand.value) do lines[i] = line.source:get_text(); end
template = repr(table.concat(lines, "\\n"));
else
template = repr(tostring(\%longhand.source:get_text()));
end
local replacements = {};
for i, a in ipairs(args) do replacements[i] = a.."="..a; end
replacements = "{"..table.concat(replacements, ", ").."}";
lua:append([[)
local template = nomsu:parse(Nomsu(]]..repr(tree.source)..[[, ]]..template..[[));
local replacement = nomsu:tree_with_replaced_vars(template, ]]..replacements..[[);
return replacement:as_lua(nomsu);
end);
]]);
return lua;
action [remove action %stub]:
lua> ".."
local fn = ACTIONS[\%stub];
local metadata = nomsu.action_metadata[fn];
for i=#metadata.aliases,1,-1 do
metadata.arg_orders[metadata.aliases[i]] = nil;
table.remove(metadata.aliases, i);
end
ACTIONS[\%stub] = nil;
immediately:
action [%tree as lua]:
=lua "\%tree:as_lua(nomsu)"
action [%tree as lua expr]:
lua> ".."
local lua = \%tree:as_lua(nomsu);
if not lua.is_value then
error("Invalid thing to convert to lua expr: "..\%tree.source:get_text());
end
return lua;
action [%tree as lua statements]:
lua> ".."
local lua = \%tree:as_lua(nomsu);
lua:convert_to_statements();
lua:declare_locals();
return lua;
action [%tree as value]:
=lua "nomsu:tree_to_value(\%tree)"
action [%tree's stub]:
=lua "nomsu:tree_to_stub(\%tree)"
immediately:
parse [%var write code %code] as: lua> "\%var:append(\%code);"
immediately:
compile [%tree's source code, %tree' source code] to: Lua value "\(%tree as lua expr).source:get_text()"
compile [repr %obj] to: Lua value "repr(\(%obj as lua expr))"
compile [type of %obj] to: Lua value "type(\(%obj as lua expr))"
immediately:
compile [nomsu] to: Lua value "nomsu"
compile [%var as lua identifier] to: Lua value "nomsu:var_to_lua_identifier(\(%var as lua expr))"
action [action %names metadata]:
=lua "nomsu.action_metadata[ACTIONS[\%names]]"
# Get the source code for a function
action [help %action]:
lua> ".."
local metadata = \(action %action metadata);
if not metadata then
print("Action not found: "..repr(\%action));
else
print(metadata.src or "<unknown source code>");
end
# Compiler tools
immediately:
compile [run %code] to:
Lua value "nomsu:run(\(%code as lua expr), \(=lua "tree.source"))"
parse [enable debugging] as: lua> "nomsu.debug = true;"
parse [disable debugging] as: lua> "nomsu.debug = false;"
immediately:
compile [show lua %block] to:
lua> ".."
local \%lua = \%block:as_lua(nomsu);
return Lua(\%block.source, "print(", repr(tostring(\%lua)), ");");
immediately:
compile [say %message] to:
lua> ".."
if \%message.type == "Text" then
return Lua(tree.source, "print(", \(%message as lua expr), ");");
else
return Lua(tree.source, "print(stringify(", \(%message as lua expr), "));");
end
immediately:
compile [source] to: Lua value (=lua "tree.source") "tree.source"
immediately:
action [Lua %]: Lua (=lua "tree.source") %
action [Lua value %]: Lua value (=lua "tree.source") %
# Return
immediately:
#.. Return statement is wrapped in a do..end block because Lua is unhappy if you
put code after a return statement, unless you wrap it in a block.
compile [return] to: Lua "do return; end"
compile [return %return_value] to: Lua "do return \(%return_value as lua expr); end"
# Error functions
immediately:
compile [barf] to: Lua value "error(nil, 0);"
compile [barf %msg] to: Lua value "error(\(%msg as lua expr), 0);"
compile [assume %condition] to:
lua> "local \%assumption = 'Assumption failed: '..\%condition.source:get_text();"
return:
Lua ".."
if not \(%condition as lua expr) then
error(\(repr %assumption), 0);
end
# TODO: factor this out and replace with "unless %condition: barf %message"
compile [assume %condition or barf %message] to:
Lua ".."
if not \(%condition as lua expr) then
error(\(%message as lua expr), 0);
end
# Literals
immediately:
compile [yes] to: Lua value "true"
compile [no] to: Lua value "false"
compile [nothing, nil, null] to: Lua value "nil"
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