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#..
This File contains actions for making actions and compile-time actions and some helper
functions to make that easier.
# Helper function
immediately
lua> ".."
nomsu.parse_spec = function(nomsu, spec)
if spec.type == 'List' then
local names = {};
for i, alias in ipairs(spec.value) do
if alias.type == "FunctionCall" then
names[i] = alias.src;
elseif alias.type == "Text" then
names[i] = nomsu:tree_to_value(alias);
end
end
local junk, arg_names, junk = nomsu:get_stub(names[1]);
local args = {};
for i, a in ipairs(arg_names) do args[i] = nomsu:var_to_lua_identifier(a); end
return names, args;
else
local alias = nomsu:tree_to_value(spec);
local junk, arg_names, junk = nomsu:get_stub(alias);
local args = {};
for i, a in ipairs(arg_names) do args[i] = nomsu:var_to_lua_identifier(a); end
return {alias}, args;
end
end
# Compile-time action to make compile-time actions:
# TODO: reduce code duplication here
immediately
lua> ".."
do
local function compile_to(name_tree, body_tree, kind)
local names, args = nomsu:parse_spec(name_tree);
local declared_locals = {};
for i, arg in ipairs(args) do declared_locals[arg] = true; end
names, args = repr(names), table.concat(args, ", ");
local body_lua = nomsu:tree_to_lua(body_tree);
if body_lua.expr and not body_lua.locals then
return [[
nomsu:define_compile_action(]]..names..[[, ]]..repr(name_tree:get_line_no())..[[, function(]]..args..[[)
return {]]..kind..[[=]]..body_lua.expr..[[};
end, ]]..repr(nomsu:source_code())..[[);
]];
end
local body_code = body_lua.statements or ("return "..body_lua.expr..";");
local undeclared_locals = {};
for i, body_local in ipairs(body_lua.locals or {}) do
if not declared_locals[body_local] then
table.insert(undeclared_locals, body_local);
end
end
if #undeclared_locals > 0 then
body_code = "local "..table.concat(undeclared_locals, ", ")..";\\n"..body_code;
end
return [[
do
local function compile_action(]]..args..[[)
]]..body_code.."\\n"..[[
end
nomsu:define_compile_action(]]..names..[[, ]]..repr(name_tree:get_line_no())..[[, function(]]..args..[[)
return {]]..kind..[[=compile_action(]]..args..[[)};
end, ]]..repr(nomsu:source_code())..[[);
end]];
end
local src = \(__src__ 1);
nomsu:define_compile_action("compile %names to %body", \(__line_no__), function(\%names, \%body)
return {statements=compile_to(\%names, \%body, "expr")};
end, src);
nomsu:define_compile_action("compile %names to code %body", \(__line_no__), function(\%names, \%body)
return {statements=compile_to(\%names, \%body, "statements")};
end, src);
end
# Compile-time action to make actions
immediately
compile [action %names %body] to code
lua> ".."
local names, args = nomsu:parse_spec(\%names);
local declared_locals = {};
for i, arg in ipairs(args) do declared_locals[arg] = true; end
names, args = repr(names), table.concat(args, ", ");
local body_lua = nomsu:tree_to_lua(\%body);
local body_code = body_lua.statements or ("return "..body_lua.expr..";");
local undeclared_locals = {};
for i, body_local in ipairs(body_lua.locals or {}) do
if not declared_locals[body_local] then
table.insert(undeclared_locals, body_local);
end
end
if #undeclared_locals > 0 then
body_code = "local "..table.concat(undeclared_locals, ", ")..";\\n"..body_code;
end
local src = nomsu:dedent(nomsu:source_code(0));
local def_lua = ([[
nomsu:define_action(%s, \(__line_no__), function(%s)
%s
end, %s);]]):format(names, args, body_code, repr(src));
return def_lua;
# Macro to make nomsu macros:
immediately
lua> ".."
nomsu:define_compile_action("parse %shorthand as %longhand", \(__line_no__), (function(\%shorthand, \%longhand)
local names, args = nomsu:parse_spec(\%shorthand);
names, args = repr(names), table.concat(args, ", ");
local template;
if \%longhand.type == "Block" then
template = {};
for i, line in ipairs(\%longhand.value) do
template[i] = nomsu:dedent(line.src);
end
template = repr(table.concat(template, "\\n"));
else
template = repr(nomsu:dedent(\%longhand.src));
end
local junk, arg_names, junk = nomsu:get_stub(\%shorthand.value[1]);
local replacements = {};
for i, a in ipairs(arg_names) do replacements[i] = "["..repr(a).."]="..nomsu:var_to_lua_identifier(a); end
replacements = "{"..table.concat(replacements, ", ").."}";
local lua_code = ([[
nomsu:define_compile_action(%s, %s, (function(%s)
local template = nomsu:parse(%s, %s);
local replacement = nomsu:tree_with_replaced_vars(template, %s);
return nomsu:tree_to_lua(replacement);
end), %s)]]):format(names, repr(\%shorthand:get_line_no()), args, template,
repr(\%shorthand:get_line_no()), replacements, repr(nomsu:source_code(0)));
return {statements=lua_code};
end), \(__src__ 1));
action [remove action %stub]
lua> ".."
local fn = ACTIONS[\%stub];
local metadata = 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 "nomsu:tree_to_lua(\%tree).expr"
action [%tree as lua statements]
lua> ".."
local lua = nomsu:tree_to_lua(\%tree);
return lua.statements or (lua.expr..";");
action [%tree as value]
=lua "nomsu:tree_to_value(\%tree)"
compile [repr %obj] to
"repr(\(%obj as lua))"
compile [type of %obj] to
"type(\(%obj as lua))"
immediately
parse [lua do> %block] as
lua> "do"
lua> %block
lua> "end"
compile [nomsu] to "nomsu"
compile [nomsu's %key] to "nomsu[\(%key as lua)]"
compile [nomsu %method %args] to "nomsu[\(%method as lua)](nomsu, unpack(\(%args as lua)))"
compile [tree %tree with %replacements] to ".."
nomsu:tree_with_replaced_vars(\(%tree as lua), \(%replacements as lua))
action [action %names metadata]
=lua "ACTION_METADATA[ACTIONS[\%names]]"
# Get the source code for a function
action [help %action]
lua> ".."
local metadata = \(action %action metadata);
if not metadata then
nomsu:writeln("Action not found: "..repr(\%action));
else
nomsu:writeln(metadata.src or "<unknown source code>");
end
# Compiler tools
parse [run %code] as: nomsu "run" [%code]
parse [enable debugging] as: lua> "nomsu.debug = true"
parse [disable debugging] as: lua> "nomsu.debug = false"
compile [say %message] to
lua> ".."
if \%message.type == "Text" then
return "nomsu:writeln("..\(%message as lua)..")";
else
return "nomsu:writeln(stringify("..\(%message as lua).."))";
end
# Error functions
compile [barf!] to "error(nil, 0)"
compile [barf %msg] to "error(\(%msg as lua), 0)"
compile [assume %condition] to "assert(\(%condition as lua))"
compile [assume %condition or barf %msg] to "assert(\(%condition as lua), \(%msg as lua))"
# Literals
compile [yes] to "true"
compile [no] to "false"
compile [nothing, nil, null] to "nil"
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