– This file contains the source code of the Nomsu compiler.
unpack or= table.unpack {:match, :sub, :gsub, :format, :byte, :find} = string {:LuaCode, :Source} = require “codeobj” require “text” SyntaxTree = require “syntaxtree” Files = require “files”
prettyerror = require(“prettyerrors”) failat = (source, msg)-> local file if SyntaxTree\isinstance(source) file = source\getsourcefile! source = source.source elseif type(source) == ‘string’ source = Source\fromstring(source) elseif not Source\isinstance(source) – debug.getinfo() output: assert(source.shortsrc and source.currentline) file = Files.read(source.shortsrc) assert file, “Could not find #{source.shortsrc}” lines = file\lines! start = 1 for i=1,source.currentline-1 start += #lines[i] stop = start + #lines[source.currentline] source = Source(source.shortsrc, start, stop)
if source and not file
file = Files.read(source.filename)
if not file
if NOMSU_PREFIX
path = "#{NOMSU_PREFIX}/share/nomsu/#{table.concat NOMSU_VERSION, "."}/#{source.filename}"
file = Files.read(path)
if not file
error("Can't find file: "..tostring(source.filename))
title, err_msg, hint = msg\match("([^:]*):[ \n]+(.*)[ \n]+Hint: (.*)")
if not err_msg
err_msg, hint = msg\match("(.*)[ \n]+Hint:[ \n]+(.*)")
title = "Failure"
if not err_msg
title, err_msg = msg\match("([^:]*):[ \n]+(.*)")
if not err_msg
err_msg = msg
title = "Failure"
err_str = pretty_error{
title: title,
error: err_msg, hint: hint, source: file,
start:source.start, stop:source.stop, filename:source.filename,
}
error(err_str, 0)
– This is a bit of a hack, but this code handles arbitrarily complex – math expressions like 2x + 3^2 without having to define a single – action for every possibility. re = require ‘re’ math_expression = re.compile [[ (([/^+-] / [0-9]+) “ “)* [*/^+-] !. ]]
MAX_LINE = 80 – For beautification purposes, try not to make lines much longer than this value compile = (tree)=> if tree == nil error(“No tree was passed in.”)
-- Automatically upgrade trees from older versions:
if tree.version and tree.version < @NOMSU_VERSION\up_to(#tree.version) and @_1_upgraded_from_2_to
tree = @._1_upgraded_from_2_to(tree, tree.version, @NOMSU_VERSION)
switch tree.type
when "Action"
stub = tree.stub
compile_action = @COMPILE_RULES[stub]
if not compile_action and math_expression\match(stub)
lua = LuaCode\from(tree.source)
for i,tok in ipairs tree
if type(tok) == 'string'
lua\add tok
else
tok_lua = @compile(tok)
-- TODO: this is overly eager, should be less aggressive
tok_lua\parenthesize! if tok.type == "Action"
lua\add tok_lua
lua\add " " if i < #tree
return lua
if not compile_action
seen_words = {}
words = {}
for word in stub\gmatch("[^0-9 ][^ ]*")
unless seen_words[word]
seen_words[word] = true
table.insert words, word
table.sort(words)
stub2 = table.concat(words, " ")
compile_action = @COMPILE_RULES[stub2]
if compile_action
if debug.getinfo(compile_action, 'u').isvararg
stub = stub2
else compile_action = nil
if compile_action
args = [arg for arg in *tree when type(arg) != "string"]
ret = compile_action(@, tree, unpack(args))
if ret == nil
info = debug.getinfo(compile_action, "S")
filename = Source\from_string(info.source).filename
fail_at tree,
("Compile error: The compile-time action here (#{stub}) failed to return any value. "..
"Hint: Look at the implementation of (#{stub}) in #{filename}:#{info.linedefined} and make sure it's returning something.")
unless SyntaxTree\is_instance(ret)
ret.source or= tree.source
return ret
if ret != tree
return @compile(ret)
lua = LuaCode\from(tree.source)
lua\add((stub)\as_lua_id!,"(")
for argnum, arg in ipairs tree\get_args!
arg_lua = @compile(arg)
if arg.type == "Block" and #arg > 1
arg_lua = LuaCode\from(arg.source, "(function()\n ", arg_lua, "\nend)()")
if lua\trailing_line_len! + #arg_lua > MAX_LINE
lua\add(argnum > 1 and ",\n " or "\n ")
elseif argnum > 1
lua\add ", "
lua\add arg_lua
lua\add ")"
return lua
when "MethodCall"
stub = tree\get_stub!
compile_action = @COMPILE_RULES[stub]
if compile_action
args = tree\get_args!
ret = compile_action(@, tree, unpack(args))
if ret == nil
info = debug.getinfo(compile_action, "S")
filename = Source\from_string(info.source).filename
fail_at tree,
("Compile error: The compile-time method here (#{stub}) failed to return any value. "..
"Hint: Look at the implementation of (#{stub}) in #{filename}:#{info.linedefined} "..
"and make sure it's returning something.")
unless SyntaxTree\is_instance(ret)
ret.source or= tree.source
return ret
if ret != tree
return @compile(ret)
lua = LuaCode\from tree.source
target_lua = @compile tree[1]
target_text = target_lua\text!
-- TODO: this parenthesizing is maybe overly conservative
if not (target_text\match("^%(.*%)$") or target_text\match("^[_a-zA-Z][_a-zA-Z0-9.]*$") or
tree[1].type == "IndexChain")
target_lua\parenthesize!
self_lua = #tree > 2 and "_self" or target_lua
if #tree > 2
lua\add "(function(", self_lua, ")\n "
for i=2,#tree
lua\add "\n " if i > 2
if i > 2 and i == #tree
lua\add "return "
lua\add self_lua, ":"
lua\add((tree[i].stub)\as_lua_id!,"(")
for argnum, arg in ipairs tree[i]\get_args!
arg_lua = @compile(arg)
if arg.type == "Block" and #arg > 1
arg_lua = LuaCode\from(arg.source, "(function()\n ", arg_lua, "\nend)()")
if lua\trailing_line_len! + #arg_lua > MAX_LINE
lua\add(argnum > 1 and ",\n " or "\n ")
elseif argnum > 1
lua\add ", "
lua\add arg_lua
lua\add ")"
if #tree > 2
lua\add "\nend)(", target_lua, ")"
return lua
when "EscapedNomsu"
lua = LuaCode\from tree.source, "SyntaxTree{"
needs_comma, i = false, 1
as_lua = (x)->
if type(x) == 'number'
tostring(x)
elseif SyntaxTree\is_instance(x)
@compile(x)
elseif Source\is_instance(x)
tostring(x)\as_lua!
else x\as_lua!
for k,v in pairs((SyntaxTree\is_instance(tree[1]) and tree[1].type == "EscapedNomsu" and tree) or tree[1])
entry_lua = LuaCode!
if k == i
i += 1
elseif type(k) == 'string' and match(k,"[_a-zA-Z][_a-zA-Z0-9]*")
entry_lua\add(k, "= ")
else
entry_lua\add("[", as_lua(k), "]= ")
entry_lua\add as_lua(v)
if needs_comma then lua\add ","
if lua\trailing_line_len! + #(entry_lua\match("^[\n]*")) > MAX_LINE
lua\add "\n "
elseif needs_comma
lua\add " "
lua\add entry_lua
needs_comma = true
lua\add "}"
return lua
when "Block"
lua = LuaCode\from(tree.source)
for i, line in ipairs tree
if line.type == "Error"
return @compile(line)
for i, line in ipairs tree
if i > 1 then lua\add "\n"
line_lua = @compile(line)
lua\add line_lua
unless line_lua\last(1) == ";" or line_lua\last(4)\match("[^_a-zA-Z0-9]end$")
lua\add ";"
return lua
when "Text"
if #tree == 0
return LuaCode\from(tree.source, '""')
if #tree == 1 and type(tree[1]) == 'string'
return LuaCode\from(tree.source, tree[1]\as_lua!)
lua = LuaCode\from(tree.source, "Text(")
added = 0
string_buffer = ""
add_bit = (bit)->
if added > 0
if lua\trailing_line_len! + #bit > MAX_LINE
lua\add ",\n "
else
lua\add ", "
lua\add bit
added += 1
for i, bit in ipairs tree
if type(bit) == "string"
string_buffer ..= bit
continue
if string_buffer != ""
for i=1,#string_buffer,MAX_LINE
add_bit string_buffer\sub(i, i+MAX_LINE-1)\as_lua!
string_buffer = ""
bit_lua = @compile(bit)
if bit.type == "Block"
bit_lua = LuaCode\from bit.source, "a_List(function(add)",
"\n ", bit_lua,
"\nend):joined()"
add_bit bit_lua
if string_buffer != ""
for i=1,#string_buffer,MAX_LINE
add_bit string_buffer\sub(i, i+MAX_LINE-1)\as_lua!
string_buffer = ""
if added == 0
return LuaCode\from(tree.source, '""')
lua\add ")"
return lua
when "List", "Dict"
typename = "a_"..tree.type
if #tree == 0
return LuaCode\from tree.source, typename, "{}"
lua = LuaCode\from tree.source
chunks = 0
i = 1
while tree[i]
if tree[i].type == 'Block'
lua\add " + " if chunks > 0
lua\add typename, "(function(", (tree.type == 'List' and "add" or ("add, "..("add 1 =")\as_lua_id!)), ")"
body = @compile(tree[i])
body\declare_locals!
lua\add "\n ", body, "\nend)"
chunks += 1
i += 1
else
lua\add " + " if chunks > 0
sep = ''
items_lua = LuaCode\from tree[i].source
while tree[i]
if tree[i].type == "Block"
break
item_lua = @compile tree[i]
if item_lua\match("^%.[a-zA-Z_]")
item_lua = item_lua\text!\sub(2)
if tree.type == 'Dict' and tree[i].type == 'Index'
item_lua = LuaCode\from tree[i].source, item_lua, "=true"
items_lua\add sep, item_lua
if tree[i].type == "Comment"
items_lua\add "\n"
sep = ''
elseif items_lua\trailing_line_len! > MAX_LINE
sep = items_lua\last(1) == ";" and "\n " or ",\n "
else
sep = items_lua\last(1) == ";" and " " or ", "
i += 1
if items_lua\is_multiline!
lua\add LuaCode\from items_lua.source, typename, "{\n ", items_lua, "\n}"
else
lua\add LuaCode\from items_lua.source, typename, "{", items_lua, "}"
chunks += 1
return lua
when "Index"
key_lua = @compile(tree[1])
key_str = key_lua\match('^"([a-zA-Z_][a-zA-Z0-9_]*)"$')
return if key_str and key_str\is_lua_id!
LuaCode\from tree.source, ".", key_str
elseif key_lua\first(1) == "["
-- NOTE: this *must* use a space after the [ to avoid freaking out
-- Lua's parser if the inner expression is a long string. Lua
-- parses x[[[y]]] as x("[y]"), not as x["y"]
LuaCode\from tree.source, "[ ",key_lua,"]"
else
LuaCode\from tree.source, "[",key_lua,"]"
when "DictEntry"
key = tree[1]
if key.type != "Index"
key = SyntaxTree{type:"Index", source:key.source, key}
return LuaCode\from tree.source, @compile(key),"=",(tree[2] and @compile(tree[2]) or "true")
when "IndexChain"
lua = @compile(tree[1])
if lua\match("['\"}]$") or lua\match("]=*]$")
lua\parenthesize!
if lua\text! == "..."
return LuaCode\from(tree.source, "select(", @compile(tree[2][1]), ", ...)")
for i=2,#tree
key = tree[i]
-- TODO: remove this shim
if key.type != "Index"
key = SyntaxTree{type:"Index", source:key.source, key}
lua\add @compile(key)
return lua
when "Number"
number = tostring(tree[1])\gsub("_", "")
return LuaCode\from(tree.source, number)
when "Var"
if tree[1].type == "MethodCall"
return LuaCode\from(tree.source, @compile(tree[1][1]), ".", tree[1][2]\get_stub!\as_lua_id!)
return LuaCode\from(tree.source, tree\as_var!\as_lua_id!)
when "FileChunks"
error("Can't convert FileChunks to a single block of lua, since each chunk's "..
"compilation depends on the earlier chunks")
when "Comment"
return LuaCode\from(tree.source, "-- ", (tree[1]\gsub('\n', '\n-- ')))
when "Error"
err_msg = pretty_error{
title:"Parse error"
error:tree.error, hint:tree.hint, source:tree\get_source_file!
start:tree.source.start, stop:tree.source.stop, filename:tree.source.filename
}
-- Coroutine yield here?
error(err_msg)
else
error("Unknown type: #{tree.type}")
return {:compile, :fail_at}