diff options
| -rw-r--r-- | core/metaprogramming.nom | 19 | ||||
| -rw-r--r-- | core/text.nom | 11 | ||||
| -rwxr-xr-x | nomsu.moon | 235 | ||||
| -rw-r--r-- | nomsu_tree.moon | 53 | ||||
| -rw-r--r-- | tests/text.nom | 1 |
5 files changed, 104 insertions, 215 deletions
diff --git a/core/metaprogramming.nom b/core/metaprogramming.nom index fdbae61..d4ae624 100644 --- a/core/metaprogramming.nom +++ b/core/metaprogramming.nom @@ -5,7 +5,7 @@ # Compile-time action to make compile-time actions: immediately lua> ".." - nomsu:define_compile_action("compile %actions to %lua", \(!! code location !!), function(tree, \%actions, \%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 @@ -17,7 +17,7 @@ immediately else lua:append(stubs,", "); end - lua:append(repr(tree.source:get_line()), ", function(tree"); + lua:append("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 @@ -49,7 +49,7 @@ immediately else lua:append(stubs,", "); end - lua:append(repr(tree.source:get_line()), ", function("); + lua:append("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 @@ -80,7 +80,7 @@ immediately else lua:append(stubs,", "); end - lua:append(repr(tree.source:get_line()), ", function(tree"); + lua:append("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 @@ -103,12 +103,11 @@ immediately 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); + local stubs = ARG_ORDERS[fn]; + for stub in pairs(stubs) do + ACTIONS[stub] = nil; end - ACTIONS[\%stub] = nil; + ARG_ORDERS[fn] = nil; immediately action [%tree as lua] @@ -142,7 +141,7 @@ immediately action [%tree's stub] - =lua "nomsu:tree_to_stub(\%tree)" + =lua "\%tree:get_stub()" immediately parse [%var <-write %code] as: lua> "\%var:append(\%code);" diff --git a/core/text.nom b/core/text.nom index 835ef87..465e3f6 100644 --- a/core/text.nom +++ b/core/text.nom @@ -18,11 +18,6 @@ compile [capitalized %text, %text capitalized] to compile [%text with %sub instead of %patt, %text s/%patt/%sub] to Lua value "((\(%text as lua expr)):gsub(\(%patt as lua expr), \(%sub as lua expr)))" -# TODO: figure out whether indent/dedent should affect first line -compile [indented %text, %text indented] to: Lua value "((\%text):gsub('\\n','\\n'..(' ')))" -compile [dedented %obj, %obj dedented] to: Lua value "nomsu:dedent(\(%obj as lua expr))" -compile [%text indented %n times] to: Lua value "((\%text):gsub('\\n','\\n'..(' '):rep(\%n)))" - # Text literals lua> ".." do @@ -32,7 +27,7 @@ lua> ".." }; for name, e in pairs(escapes) do local lua = "'"..e.."'"; - nomsu:define_compile_action(name, \(!! code location !!), function(tree) return Lua.Value(tree.source, lua); end); + nomsu:define_compile_action(name, function(tree) return Lua.Value(tree.source, lua); end); end local colors = { ["reset color"]="\\\\27[0m", bright="\\\\27[1m", dim="\\\\27[2m", underscore="\\\\27[4m", @@ -47,8 +42,8 @@ lua> ".." for name, c in pairs(colors) do local color = "'"..c.."'"; local reset = "'"..colors["reset color"].."'"; - nomsu:define_compile_action(name, \(!! code location !!), function(tree) return Lua.Value(tree.source, color); end); - nomsu:define_compile_action(name.." %", \(!! code location !!), function(\%) + nomsu:define_compile_action(name, function(tree) return Lua.Value(tree.source, color); end); + nomsu:define_compile_action(name.." %", function(\%) return Lua.Value(tree.source, color, "..", \%:as_lua(nomsu), "..", reset); end); end @@ -223,7 +223,6 @@ class NomsuCompiler }) @use_stack = {} @file_metadata = setmetatable({}, {__mode:"k"}) - @action_metadata = setmetatable({}, {__mode:"k"}) @environment = { -- Discretionary/convenience stuff @@ -241,69 +240,47 @@ class NomsuCompiler @environment.Nomsu = Nomsu @environment.Source = Source @environment.ACTIONS = setmetatable({}, {__index:(key)=> - error("Attempt to run undefined action: #{key}", 0) + (...)-> + error("Attempt to run undefined action: #{key}", 0) }) + @environment.MACROS = {} + @environment.ARG_ORDERS = setmetatable({}, {__mode:"k"}) @environment.LOADED = {} @environment.Types = Types @initialize_core! - define_action: (signature, source, fn)=> - if type(fn) != 'function' - error 'function', "Bad fn: #{repr fn}" + stub_defs = { + space:(P(' ') + P('\n..'))^0 + word:(NOMSU_DEFS.ident_char^1 + NOMSU_DEFS.operator^1) + varname:(R('az','AZ','09') + P('_') + NOMSU_DEFS.utf8_char)^0 + } + stub_pattern = re.compile [=[ + {~ (%space->'') (('%' (%varname->'')) / %word)? ((%space->' ') (('%' (%varname->'')) / %word))* (%space->'') ~} + ]=], stub_defs + var_pattern = re.compile "{| %space ((('%' {%varname}) / %word) %space)+ |}", stub_defs + define_action: (signature, fn, is_macro=false)=> + assert(type(fn) == 'function', "Bad fn: #{repr fn}") if type(signature) == 'string' signature = {signature} - elseif type(signature) != 'table' or signature.type != nil + elseif type(signature) != 'table' error("Invalid signature, expected list of strings, but got: #{repr signature}", 0) - stubs = @get_stubs_from_signature signature - stub_args = @get_args_from_signature signature - fn_info = debug_getinfo(fn, "u") - local fn_arg_positions, arg_orders - unless fn_info.isvararg - fn_arg_positions = {debug.getlocal(fn, i), i for i=1,fn_info.nparams} - arg_orders = {} -- Map from stub -> index where each arg in the stub goes in the function call - for sig_i=1,#stubs - stub, args = stubs[sig_i], stub_args[sig_i] - @environment.ACTIONS[stub] = fn - unless fn_info.isvararg - arg_positions = [fn_arg_positions[a] for a in *args] - -- TODO: better error checking? - --if #arg_positions != #args - -- error("Mismatch in args between lua function's #{repr fn_arg_positions} and stub's #{repr args} for #{repr stub}", 0) - arg_orders[stub] = arg_positions - - @action_metadata[fn] = { - :fn, :source, aliases:stubs, :arg_orders, - arg_positions:fn_arg_positions, def_number:@@def_number, - } + stubs = [assert(stub_pattern\match(alias)) for alias in *signature] + stub_args = [assert(var_pattern\match(alias)) for alias in *signature] - define_compile_action: (signature, source, fn, src)=> - @define_action(signature, source, fn) - @action_metadata[fn].compile_time = true - - serialize_defs: (scope=nil, after=nil)=> - -- TODO: repair - error("Not currently functional.", 0) - - dedent: (code)=> - unless code\find("\n") - return code - spaces, indent_spaces = math.huge, math.huge - for line in code\gmatch("\n([^\n]*)") - if line\match("^%s*#.*") or line\match("^%s*$") - continue -- skip comments and blank lines - elseif s = line\match("^(%s*)%.%..*") - spaces = math.min(spaces, #s) - elseif s = line\match("^(%s*)%S.*") - indent_spaces = math.min(indent_spaces, #s) - if spaces != math.huge and spaces < indent_spaces - return (code\gsub("\n"..(" ")\rep(spaces), "\n")) - elseif indent_spaces != math.huge - return (code\gsub("\n"..(" ")\rep(indent_spaces), "\n ")) - else return code - - indent: (code, levels=1)=> - return code\gsub("\n","\n"..(" ")\rep(levels)) + fn_info = debug_getinfo(fn, "u") + assert(not fn_info.isvararg, "Vararg functions aren't supported. Sorry, use a list instead.") + fn_arg_positions = {debug.getlocal(fn, i), i for i=1,fn_info.nparams} + arg_orders = {} + for alias in *signature + stub = assert(stub_pattern\match(alias)) + stub_args = assert(var_pattern\match(alias)) + (is_macro and @environment.MACROS or @environment.ACTIONS)[stub] = fn + arg_orders[stub] = [fn_arg_positions[@var_to_lua_identifier(a)] for a in *stub_args] + @environment.ARG_ORDERS[fn] = arg_orders + + define_compile_action: (signature, fn)=> + return @define_action(signature, fn, true) parse: (nomsu_code)=> if type(nomsu_code) == 'string' @@ -409,31 +386,6 @@ class NomsuCompiler lua = Lua(tree.source, "return ",tree\as_lua(@),";") return @run_lua(lua) - value_to_nomsu: (value)=> - switch type(value) - when "nil" - return "(nil)" - when "bool" - return value and "(yes)" or "(no)" - when "number" - -- TODO: support NaN, inf, etc.? - return repr(value) - when "table" - if is_list(value) - return "[#{concat [@value_to_nomsu(v) for v in *value], ", "}]" - else - return "{#{concat ["#{@value_to_nomsu(k)}:#{@value_to_nomsu(v)}" for k,v in pairs(value)], ", "}}" - when "string" - if value == "\n" - return "'\\n'" - elseif not value\find[["]] and not value\find"\n" and not value\find"\\" - return "\""..value.."\"" - else - -- TODO: This might fail if it's being put inside a list or something - return '".."\n '..(@indent value) - else - error("Unsupported value_to_nomsu type: #{type(value)}", 0) - walk_tree: (tree, depth=0)=> coroutine.yield(tree, depth) return unless Types.is_node(tree) @@ -466,107 +418,19 @@ class NomsuCompiler insert bits, ((" ")\rep(depth)..repr(node)) return concat(bits, "\n") - @unescape_string: (str)=> - Cs(((P("\\\\")/"\\") + (P("\\\"")/'"') + NOMSU_DEFS.escaped_char + P(1))^0)\match(str) - - @comma_separated_items: (open, items, close)=> - bits = {open} - so_far = 0 - for i,item in ipairs(items) - if i < #items then item ..= ", " - insert bits, item - so_far += #item - if so_far >= 80 - insert bits, "\n" - so_far = 0 - insert bits, close - return concat(bits) - tree_map: (tree, fn)=> -- Return a new tree with fn mapped to each node. If fn provides a replacement, -- use that and stop recursing, otherwise recurse. unless Types.is_node(tree) then return tree - replacement = fn(tree) - if replacement != nil - return replacement - switch tree.type - when "File", "Nomsu", "Block", "List", "Action", "Text", "IndexChain" - new_values, is_changed = {}, false - for i,old_value in ipairs(tree.value) - new_value = type(old_value) != "string" and @tree_map(old_value, fn) or nil - if new_value != nil and new_value != old_value - is_changed = true - new_values[i] = new_value - else - new_values[i] = old_value - if is_changed - return tree\with_value Tuple(table.unpack(new_values)) - - when "Dict" - new_values, is_changed = {}, false - for i,e in ipairs tree.value - new_key = @tree_map(e.key, fn) - new_value = @tree_map(e.value, fn) - if (new_key != nil and new_key != e.key) or (new_value != nil and new_value != e.value) - is_changed = true - new_values[i] = DictEntry(new_key, new_value) - else - new_values[i] = e - if is_changed - return tree\with_value Tuple(table.unpack(new_values)) - when nil -- Raw table, probably from one of the .value of a multi-value tree (e.g. List) - error("Invalid tree: #{repr tree}") - - return tree + return tree\map(fn) tree_with_replaced_vars: (tree, replacements)=> - return @tree_map tree, (t)-> + tree\map (t)-> if t.type == "Var" id = tostring(t\as_lua(self)) if replacements[id] != nil return replacements[id] - tree_to_stub: (tree)=> - if tree.type != "Action" then error "Tried to get stub from non-functioncall tree: #{tree.type}", 0 - return concat([(t.type == "Word" and t.value or "%") for t in *tree.value], " ") - - tree_to_named_stub: (tree)=> - if tree.type != "Action" then error "Tried to get stub from non-functioncall tree: #{tree.type}", 0 - return concat([(t.type == "Word" and t.value or "%#{t.value}") for t in *tree.value], " ") - - stub_defs = { - space:(P(' ') + P('\n..'))^0 - word:(NOMSU_DEFS.ident_char^1 + NOMSU_DEFS.operator^1) - varname:(R('az','AZ','09') + P('_') + NOMSU_DEFS.utf8_char)^0 - } - stub_pattern = re.compile("{~ (%space->'') (('%' (%varname->'')) / %word)? ((%space->' ') (('%' (%varname->'')) / %word))* (%space->'') ~}", stub_defs) - get_stubs_from_signature: (signature)=> - if type(signature) != 'table' or signature.type - error("Invalid signature: #{repr signature}", 0) - stubs = {} - for i,alias in ipairs(signature) - if type(alias) != 'string' - error("Expected entries in signature to be strings, not #{type(alias)}s like: #{repr alias}\nsignature: #{repr signature}", 0) - stubs[i] = stub_pattern\match(alias) - unless stubs[i] - error("Failed to match stub pattern on alias: #{repr alias}") - return stubs - - var_pattern = re.compile("{| %space ((('%' {%varname}) / %word) %space)+ |}", stub_defs) - get_args_from_signature: (signature)=> - if type(signature) != 'table' or signature.type - error("Invalid signature: #{repr signature}", 0) - stub_args = {} - for i,alias in ipairs(signature) - if type(alias) != 'string' - error("Invalid type for signature: #{type(alias)} for:\n#{repr alias}", 0) - args = var_pattern\match(alias) - unless args - error("Failed to match arg pattern on alias: #{repr alias}", 0) - for j=1,#args do args[j] = @var_to_lua_identifier(args[j]) - stub_args[i] = args - return stub_args - var_to_lua_identifier: (var)=> -- Converts arbitrary nomsu vars to valid lua identifiers by replacing illegal -- characters with escape sequences @@ -577,9 +441,8 @@ class NomsuCompiler initialize_core: => -- Sets up some core functionality - get_line_no = -> "nomsu.moon:#{debug_getinfo(2).currentline}" nomsu = self - @define_compile_action "immediately %block", get_line_no!, (_block)=> + @define_compile_action "immediately %block", (_block)=> lua = _block\as_lua(nomsu) lua\convert_to_statements! lua\declare_locals! @@ -601,31 +464,31 @@ class NomsuCompiler error "#{line}: Cannot use #{colored.yellow src} as a string interpolation value, since it's not an expression." lua\append bit_lua - @define_compile_action "Lua %code", get_line_no!, (_code)=> + @define_compile_action "Lua %code", (_code)=> lua = Lua.Value(@source, "Lua(", tostring(_code.source)) add_lua_bits(lua, _code) lua\append ")" return lua - @define_compile_action "Lua %source %code", get_line_no!, (_source, _code)=> + @define_compile_action "Lua %source %code", (_source, _code)=> lua = Lua.Value(@source, "Lua(", _source\as_lua(nomsu)) add_lua_bits(lua, _code) lua\append ")" return lua - @define_compile_action "Lua value %code", get_line_no!, (_code)=> + @define_compile_action "Lua value %code", (_code)=> lua = Lua.Value(@source, "Lua.Value(", tostring(_code.source)) add_lua_bits(lua, _code) lua\append ")" return lua - @define_compile_action "Lua value %source %code", get_line_no!, (_source, _code)=> + @define_compile_action "Lua value %source %code", (_source, _code)=> lua = Lua.Value(@source, "Lua.Value(", _source\as_lua(nomsu)) add_lua_bits(lua, _code) lua\append ")" return lua - @define_compile_action "lua> %code", get_line_no!, (_code)=> + @define_compile_action "lua> %code", (_code)=> if _code.type != "Text" return Lua.Value @source, "nomsu:run_lua(Lua(",repr(_code.source), ", ",repr(tostring(_code\as_lua(nomsu))),"))" @@ -642,7 +505,7 @@ class NomsuCompiler lua\append bit_lua return lua - @define_compile_action "=lua %code", get_line_no!, (_code)=> + @define_compile_action "=lua %code", (_code)=> if _code.type != "Text" return Lua.Value @source, "nomsu:run_lua(Lua(",repr(_code.source), ", ",repr(tostring(_code\as_lua(nomsu))),"))" @@ -659,13 +522,13 @@ class NomsuCompiler lua\append bit_lua return lua - @define_compile_action "!! code location !!", get_line_no!, => + @define_compile_action "!! code location !!", => return Lua.Value(@source, repr(tostring(@source))) - @define_action "run file %filename", get_line_no!, (_filename)-> + @define_action "run file %filename", (_filename)-> return nomsu\run_file(_filename) - @define_compile_action "use %path", get_line_no!, (_path)=> + @define_compile_action "use %path", (_path)=> path = nomsu\tree_to_value(_path) nomsu\use_file(path) return Lua(@source, "nomsu:use_file(#{repr path});") @@ -730,9 +593,13 @@ OPTIONS else debug_getinfo(thread,f,what) if not info or not info.func then return info if info.short_src or info.source or info.linedefine or info.currentline + for k,v in pairs(nomsu.environment.ACTIONS) + if v == info.func + info.name = k + break + [=[ if metadata = nomsu.action_metadata[info.func] info.name = metadata.aliases[1] - [=[ filename = if type(metadata.source) == 'string' metadata.source\match("^[^[:]*") else metadata.source.filename @@ -815,7 +682,6 @@ OPTIONS else io.stdout nomsu.skip_precompiled = not args.optimized - compile_fn = nil if print_file == nil nomsu.environment.print = -> elseif print_file != io.stdout @@ -828,10 +694,11 @@ OPTIONS print_file\write('\n') print_file\flush! - if output_file - compile_fn = (code)-> + compile_fn = if output_file + (code)-> output_file\write("local IMMEDIATE = true;\n"..tostring(code)) output_file\flush! + else nil parse_errs = {} for input in *args.inputs diff --git a/nomsu_tree.moon b/nomsu_tree.moon index 4af4dfc..69f338f 100644 --- a/nomsu_tree.moon +++ b/nomsu_tree.moon @@ -63,6 +63,9 @@ Tree "File", nomsu\append "\n" return nomsu + map: (fn)=> + fn(self) or @with_value(Tuple(unpack([v\map(fn) for v in *@value]))) + Tree "Nomsu", as_lua: (nomsu)=> Lua.Value(@source, "nomsu:parse(Nomsu(",repr(@value.source),", ",repr(tostring(@value.source\get_text!)),")).value[1]") @@ -74,6 +77,9 @@ Tree "Nomsu", return nomsu and Nomsu(@source, "\\:\n ", nomsu) return nomsu and Nomsu(@source, "\\(", nomsu, ")") + map: (fn)=> + fn(self) or @with_value(@value\map(fn)) + Tree "Block", as_lua: (nomsu)=> lua = Lua(@source) @@ -103,24 +109,24 @@ Tree "Block", nomsu\append "\n" return nomsu + map: (fn)=> + fn(self) or @with_value(Tuple(unpack([v\map(fn) for v in *@value]))) + math_expression = re.compile [[ ([+-] " ")* "%" (" " [*/^+-] (" " [+-])* " %")+ !. ]] Tree "Action", as_lua: (nomsu)=> stub = @get_stub! - action = rawget(nomsu.environment.ACTIONS, stub) - metadata = nomsu.action_metadata[action] - if metadata and metadata.compile_time + macro = nomsu.environment.MACROS[stub] + if macro args = [arg for arg in *@value when arg.type != "Word"] -- Force all compile-time actions to take a tree location - if metadata.arg_orders - new_args = [args[p-1] for p in *metadata.arg_orders[stub]] - args = new_args + args = [args[p-1] for p in *nomsu.environment.ARG_ORDERS[macro][stub]] -- Force Lua to avoid tail call optimization for debugging purposes - ret = action(self, unpack(args)) + ret = macro(self, unpack(args)) return ret - + action = rawget(nomsu.environment.ACTIONS, stub) lua = Lua.Value(@source) - if not metadata and math_expression\match(stub) + if not action and math_expression\match(stub) -- This is a bit of a hack, but this code handles arbitrarily complex -- math expressions like 2*x + 3^2 without having to define a single -- action for every possibility. @@ -148,8 +154,8 @@ Tree "Action", error "#{line}: Cannot use:\n#{colored.yellow src}\nas an argument to #{stub}, since it's not an expression, it produces: #{repr arg_lua}", 0 insert args, arg_lua - if metadata and metadata.arg_orders - args = [args[p] for p in *metadata.arg_orders[stub]] + if action + args = [args[p] for p in *nomsu.environment.ARG_ORDERS[action][stub]] -- Not really worth bothering with ACTIONS.foo(...) style since almost every action -- has arguments, so it won't work @@ -227,7 +233,9 @@ Tree "Action", if next_space == " " and #(tostring(nomsu)\match("[^\n]*$")) > MAX_LINE next_space = "\n.." return nomsu - + + map: (fn)=> + fn(self) or @with_value(Tuple(unpack([v\map(fn) for v in *@value]))) Tree "Text", as_lua: (nomsu)=> @@ -296,6 +304,9 @@ Tree "Text", nomsu\append "\n .." return nomsu + map: (fn)=> + fn(self) or @with_value(Tuple(unpack([type(v) == 'string' and v or v\map(fn) for v in *@value]))) + Tree "List", as_lua: (nomsu)=> lua = Lua.Value @source, "{" @@ -357,6 +368,9 @@ Tree "List", nomsu\append line return nomsu + map: (fn)=> + fn(self) or @with_value(Tuple(unpack([v\map(fn) for v in *@value]))) + Tree "Dict", as_lua: (nomsu)=> lua = Lua.Value @source, "{" @@ -441,6 +455,10 @@ Tree "Dict", nomsu\append line return nomsu + map: (fn)=> + DictEntry = Types.DictEntry + fn(self) or @with_value(Tuple(unpack([DictEntry(e.key\map(fn), e.value\map(fn)) for e in *@value]))) + Tree "IndexChain", as_lua: (nomsu)=> lua = @value[1]\as_lua(nomsu) @@ -479,6 +497,9 @@ Tree "IndexChain", nomsu\append bit_nomsu return nomsu + map: (fn)=> + fn(self) or @with_value(Tuple(unpack([v\map(fn) for v in *@value]))) + Tree "Number", as_lua: (nomsu)=> Lua.Value(@source, tostring(@value)) @@ -486,6 +507,8 @@ Tree "Number", as_nomsu: (inline=false)=> return Nomsu(@source, tostring(@value)) + map: (fn)=> fn(self) or self + Tree "Var", as_lua: (nomsu)=> lua_id = "_"..(@value\gsub "%W", (verboten)-> @@ -495,6 +518,8 @@ Tree "Var", as_nomsu: (inline=false)=> return Nomsu(@source, "%", @value) + map: (fn)=> fn(self) or self + Tree "Word", as_lua: (nomsu)=> error("Attempt to convert Word to lua") @@ -502,6 +527,8 @@ Tree "Word", as_nomsu: (inline=false)=> return Nomsu(@source, @value) + map: (fn)=> fn(self) or self + Tree "Comment", as_lua: (nomsu)=> Lua(@source, "--"..@value\gsub("\n","\n--").."\n") @@ -513,4 +540,6 @@ Tree "Comment", else return Nomsu(@source, "#", @value) + map: (fn)=> fn(self) or self + return Types diff --git a/tests/text.nom b/tests/text.nom index 72eebac..f2ef225 100644 --- a/tests/text.nom +++ b/tests/text.nom @@ -7,7 +7,6 @@ assume ((["x","y"] joined with ",") = "x,y") or barf "joined with failed" assume ((["x","y"] joined) = "xy") or barf "joined failed" assume (("asdf" capitalized) = "Asdf") or barf "capitalized failed" assume (("asdf" with "X" instead of "s") = "aXdf") or barf "substitution failed" -# TODO: add tests for indent/dedent assume ("\n" = (newline)) or barf "Text literals failed." %x <- "\(green)hello\(reset color)" assume (("x" + "y") = "xy") |