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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)
local names = {};
for i, alias in ipairs(spec.value) do
names[i] = alias.src;
end
local _, arg_names, _ = nomsu:get_stub(spec.value[1]);
local args = {};
for i, a in ipairs(arg_names) do args[i] = "_"..nomsu:var_to_lua_identifier(a); end
names, args = repr(names), table.concat(args, ", ");
return names, args;
end
# Compile-time action to make compile-time actions:
immediately:
lua> ".."
nomsu:define_compile_action("compile %names to %body", \(__line_no__), function(\%names, \%body)
assert(\%names.type == "List",
"Invalid type for compile definition names. Expected List, but got: "..tostring(\%names.type));
assert(\%body.type == "Block",
"Invalid type for compile definition body. Expected Block, but got: "..tostring(\%body.type));
local names, args = nomsu:parse_spec(\%names);
local body_lua = nomsu:tree_to_lua(\%body);
body_lua = body_lua.statements or ("return "..body_lua.expr..";");
local lua = ([[
do
local function compile_action(%s)
%s
end
local function compile_action_wrapper(...) return {expr=compile_action(...)}; end
nomsu:define_compile_action(%s, %s, compile_action_wrapper, %s);
end]]):format(args, body_lua, names, repr(\%names:get_line_no()),
repr(("compile %s\\n..to code %s"):format(\%names.src, \%body.src)));
return {statements=lua};
end, \(__src__ 1));
lua> ".."
nomsu:define_compile_action("compile %names to code %body", \(__line_no__), function(\%names, \%body)
assert(\%names.type == "List",
"Invalid type for compile definition names. Expected List, but got: "..tostring(\%names.type));
assert(\%body.type == "Block",
"Invalid type for compile definition body. Expected Block, but got: "..tostring(\%body.type));
local names, args = nomsu:parse_spec(\%names);
local body_lua = nomsu:tree_to_lua(\%body);
body_lua = body_lua.statements or ("return "..body_lua.expr..";");
local lua = ([[
do
local function compile_action(%s)
%s
end
local function compile_action_wrapper(...) return {statements=compile_action(...)}; end
nomsu:define_compile_action(%s, %s, compile_action_wrapper, %s);
end]]):format(args, body_lua, names, repr(\%names:get_line_no()),
repr(("compile %s\\n..to code %s"):format(\%names.src, \%body.src)));
return {statements=lua};
end, \(__src__ 1));
# Compile-time action to make actions
immediately:
compile [action %names %body] to code:
lua> ".."
assert(\%names.type == "List",
"Invalid type for action definition names. Expected List, but got: "..tostring(\%names.type));
assert(\%body.type == "Block",
"Invalid type for action definition body. Expected Block, but got: "..tostring(\%body.type));
local names, args = nomsu:parse_spec(\%names);
local body_lua = nomsu:tree_to_lua(\%body);
body_lua = body_lua.statements or ("return "..body_lua.expr..";");
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_lua, 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)
assert(\%shorthand.type == "List",
"Invalid type for parse definition shorthand. Expected List, but got: "..tostring(\%shorthand.type));
assert(\%longhand.type == "Block",
"Invalid type for parse definition body. Expected Block, but got: "..tostring(\%longhand.type));
local names, args = nomsu:parse_spec(\%shorthand);
local template = {};
for i, line in ipairs(\%longhand.value) do
template[i] = nomsu:dedent(line.src);
end
template = repr(table.concat(template, "\\n"));
local _, arg_names, _ = 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 def = nomsu.defs[\%stub];
for _, alias in ipairs(def.aliases) do
nomsu.defs[alias] = false;
end
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 [indented %obj] to:
"nomsu:indent(\(%obj as lua))"
compile [dedented %obj] to:
"nomsu:dedent(\(%obj as lua))"
compile [type %obj, 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))
parse [action %names] as:
(nomsu's "defs")->(nomsu "get_stub" [\%names])
# Get the source code for a function
action [help %action]:
lua> ".."
local fn_def = nomsu.defs[nomsu:get_stub(\%action)]
if not fn_def then
nomsu:writeln("Action not found: "..repr(\%action));
else
nomsu:writeln(fn_def.src or "<unknown source code>");
end
# Compiler tools
parse [eval %code, run %code] as: nomsu "run" [%code]
action [source code from tree %tree]:
lua> ".."
local _,_,leading_space = \%tree.src:find("\\n(%s*)%S");
if leading_space then
local chunk1, chunk2 = \%tree.src:match(":%s*([^\\n]*)(\\n.*)");
chunk2 = chunk2:gsub("\\n"..leading_space, "\\n");
return chunk1..chunk2.."\\n";
else
return \%tree.src:match(":%s*(%S.*)").."\\n";
end
parse [source code %body] as: source code from tree \%body
parse [parse tree %code] as: nomsu "tree_to_str" [\%code]
parse [enable debugging] as: lua> "nomsu.debug = true"
parse [disable debugging] as: lua> "nomsu.debug = false"
compile [say %str] to:
lua> ".."
if \%str.type == "Text" then
return "nomsu:writeln("..\(%str as lua)..")";
else
return "nomsu:writeln(stringify("..\(%str 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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