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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", 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
stubs = repr(stubs)
if #stubs > 80 then
lua:append("\n ",stubs,",\n ")
else
lua:append(stubs,", ")
end
lua:append("function(tree")
local args = {}
for i,tok in ipairs(\%actions.value[1].value) do
if tok.type == "Var" then args[#args+1] = tok end
end
for i, arg in ipairs(args) do
lua:append(", ", nomsu:tree_to_lua(arg))
end
local body_lua = nomsu:tree_to_lua(\%lua):as_statements("return ")
body_lua:remove_free_vars(args)
body_lua:declare_locals()
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
stubs = repr(stubs)
if #stubs > 80 then
lua:append("\n ",stubs,",\n ")
else
lua:append(stubs,", ")
end
lua:append("function(")
local args = {}
for i,tok in ipairs(\%actions.value[1].value) do
if tok.type == "Var" then args[#args+1] = tok end
end
for i, arg in ipairs(args) do
lua:append(nomsu:tree_to_lua(arg))
if i < #args then lua:append(", ") end
end
local body_lua = nomsu:tree_to_lua(\%body):as_statements("return ")
body_lua:remove_free_vars(args)
body_lua:declare_locals()
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
stubs = repr(stubs)
if #stubs > 80 then
lua:append("\n ",stubs,",\n ")
else
lua:append(stubs,", ")
end
lua:append("function(tree")
local replacements = {}
for i,tok in ipairs(\%shorthand.value[1].value) do
if tok.type == "Var" then
local lua_var = tostring(nomsu:tree_to_lua(tok))
replacements[tok.value] = lua_var
lua:append(", ", lua_var)
end
end
MANGLE_INDEX = (MANGLE_INDEX or 0) + 1
local function make_tree(t)
if type(t) ~= 'table' and type(t) ~= 'userdata' then
return repr(t)
elseif t.type == 'Var' and replacements[t.value] then
return replacements[t.value]
elseif t.type == 'Var' then
return t.type.."("..repr(t.value.."#"..tostring(MANGLE_INDEX))..", "..repr(t.source)..")"
elseif t.is_multi then
local bits = {}
for i, entry in ipairs(t.value) do
bits[i] = make_tree(entry)
end
return t.type.."(Tuple("..table.concat(bits, ", ").."), "..repr(t.source)..")"
else
return t.type.."("..repr(t.value)..", "..repr(t.source)..")"
end
end
lua:append(")\n local tree = ", make_tree(\%longhand), "\n return nomsu:tree_to_lua(tree)\nend);")
return lua
compile [remove action %action] to
Lua ".."
do
local fn = ACTIONS[\(=lua "repr(\%action:get_stub())")]
local stubs = ARG_ORDERS[fn]
for stub in pairs(stubs) do
ACTIONS[stub] = nil
end
ARG_ORDERS[fn] = nil
end
immediately
action [%tree as nomsu]
=lua "nomsu:tree_to_nomsu(\%tree)"
action [%tree as inline nomsu]
=lua "nomsu:tree_to_nomsu(\%tree, true)"
action [%tree as lua]
=lua "nomsu:tree_to_lua(\%tree)"
action [%tree as lua expr]
lua> ".."
local lua = nomsu:tree_to_lua(\%tree)
if not lua.is_value then
error("Invalid thing to convert to lua expr: "..\%tree)
end
return lua
action [%tree as lua statements]
=lua "nomsu:tree_to_lua(\%tree):as_statements()"
action [%tree with vars %vars]
=lua "\%tree:map(\%vars)"
compile [declare locals in %code] to
Lua value "\(%code as lua expr):declare_locals()"
compile [declare locals %locals in %code] to
Lua value "\(%code as lua expr):declare_locals(\(%locals as lua expr))"
compile [remove free vars %vars from %code] to
Lua "\(%code as lua expr):remove_free_vars(\(%vars as lua expr));"
action [%tree as value]
lua> ".."
if \%tree.type == 'Text' and #\%tree == 1 and type(\%tree[1]) == 'string' then
return \%tree[1]
end
local lua = Lua(\%tree.source, "return ",nomsu:tree_to_lua(\%tree))
return nomsu:run_lua(lua)
action [%tree's stub]
=lua "\%tree:get_stub()"
immediately
parse [%var <-write %code] as: lua> "\%var:append(\%code);"
parse [to %var write %code] as: lua> "\%var:append(\%code);"
immediately
compile [repr %obj] to: Lua value "repr(\(%obj as lua expr))"
compile [%obj as text] to: Lua value "tostring(\(%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:tree_to_lua(\(%var as lua expr))"
# Compiler tools
immediately
compile [run %code] to
Lua "nomsu:run(Nomsu(\(%code.source as text), \(%code as lua expr)))"
immediately
compile [show lua %block] to
lua> ".."
local \%lua = nomsu:tree_to_lua(\%block);
return Lua(tree.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
# 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 "error(nil, 0);"
compile [barf %msg] to: Lua "error(\(%msg as lua expr), 0);"
compile [assume %condition] to
lua> "local \%assumption = 'Assumption failed: '..tostring(nomsu:tree_to_nomsu(\%condition));"
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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