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# This file contains the code to convert syntax trees to Lua code
use "nomnom/code_obj.nom"
action [compile %tree using %compile_actions]:
assume (%tree is a "Syntax Tree")
if (..)
all of [..]
%tree.version, action (Nomsu version)
%tree.version != (Nomsu version)
action (1 upgraded from 2 to 3)
..: %tree = (upgrade %tree from %tree.version to (Nomsu version))
if %tree.type is:
"Action":
%stub = %tree.stub
%compile_action = %compile_actions.%stub
if %compile_action:
%args = [%tree, %compile_actions]
for % in (%tree::get args): %args::add %
%result = (call %compile_action with %args)
if (%result == (nil)):
compile error at %tree.source "\
..The compile-time action here (\(%tree.stub)) failed to return any value."
..hint "\
..Look at the implementation of (\(%tree.stub)) and make sure it's returning something."
if (%result is a "Syntax Tree"):
if (%result == %tree):
compile error at %tree.source "\
..The compile-time action here (\(%tree.stub)) is producing an endless loop."
..hint "\
..Look at the implementation of (\(%tree.stub)) and make sure it's not just returning the original tree."
return (compile %result using %compile_actions)
return %result
%lua = (new Lua Value from %tree)
if %tree.target: # Method call
%target_lua = (compile %tree.target using %compile_actions)
if (("\%target_lua"::matches "^%(.*%)$") or ("\%target_lua"::matches "^[_a-zA-Z][_a-zA-Z0-9]*$")):
%lua::add [%target_lua, ":"]
..else:
%lua::add ["(", %target_lua, "):"]
%lua:add [%stub as lua id, "("]
%args = []
for %tok in %tree:
if (%tok is text): do next %tok
# TODO: maybe translate Lua comments
if (%tok.type == "Comment"): do next %tok
if (%tok.type == "Block"):
%values = (..)
(compile %line using %compile_actions) for %line in %tok
..unless (%line.type == "Comment")
if (all of (%.is_value for % in %values)):
if ((size of %values) == 1):
%arg_lua = %values.1
..else:
%arg_lua = (new Lua Value from %tok ["("])
%arg_lua::add %values joined with " and nil or "
%arg_lua::add ")"
..else:
%arg_lua = (new Lua Value from %tok ["((function()"])
for %v in %values at %i:
if %v.is_value:
%v = (%v::as statements ("return " if (%i == (size of %values) else "")))
%arg_lua::add ["\n ", %v]
%arg_lua::add "\nend)())"
..else:
%arg_lua = (compile %tok using %compile_actions)
unless %arg_lua.is_value:
if (%tok.type == "Action"):
compile error at %tok "\
..Can't use this as an argument to (\%stub), since it's not \
..an expression, it produces: \%arg_lua"
..hint "\
..Check the implementation of (\(%tok.stub)) to see if it \
..is actually meant to produce an expression."
..else:
compile error at %tok "\
..Can't use this as an argument to (\%stub), since it's \
..not an expression, it produces: \%arg_lua"
%args::add %arg_lua
%lua::add %args joined with ", "
%lua::add ")"
return %lua
"EscapedNomsu":
return (new Lua Value from %tree ((%tree.1)::as nomsu))
"Block":
%lua = (new Lua Code from %tree)
%lua::add (..)
((compile %line using %compile_actions)::as statements)
..for %line in %tree
..joined with "\n"
return %lua
"Text":
%lua = (new Lua Code from %tree)
%lua_bits = []
%string_buffer = ""
for % in %tree:
if (% is text):
%string_buffer = "\%string_buffer\%"
do next %
if (%string_buffer != ""):
%lua_bits::add (%string_buffer::as lua)
%string_buffer = ""
%bit_lua = (compile %bit using %compile_actions)
unless %bit_lua.is_value:
compile error at %bit "\
..Can't use this as a string interpolation value, since it doesn't have a value."
if (%bit.type != "Text"):
%bit_lua = (new Lua Value from %bit ["tostring(",%bit_lua,")"])
%lua_bits::add %bit_lua
if ((%string_buffer != "") or ((size of %lua_bits) == 0)):
%lua_bits::add (%string_buffer::as lua)
%lua::add %lua_bits joined with ("..")
if ((size of %lua_bits) > 1):
%lua::parenthesize
return %lua
"List":
%lua = (new Lua Value from %tree ["_List{"])
%lua::add ((compile % using %compile_actions) for % in %tree) joined with ", " or ",\n "
%lua::add "}"
return %lua
"Dict":
%lua = (new Lua Value from %tree ["_Dict{"])
%lua::add ((compile % using %compile_actions) for % in %tree) joined with ", " or ",\n "
%lua::add "}"
return %lua
"DictEntry":
set {%key:%tree.1, %value:%tree.2}
%key_lua = (compile %key using %compile_actions)
unless %key_lua.is_value:
compile error at %tree.1 "\
..Can't use this as a dict key, since it's not an expression."
%value_lua = (..)
(compile %value using %compile_actions) if %value
..else (new Lua Value from %key ["true"]))
unless %value_lua.is_value:
compile error at %tree.2 "\
..Can't use this as a dict value, since it's not an expression."
%key_str = ("\%key_lua"::matching "^[\"']([a-zA-Z_][a-zA-Z0-9_]*)['\"]$")
if:
%key_str:
return (new Lua Code from %tree [%key_str, "=", %value_lua])
("\%key_lua".1 == "["):
# NOTE: this *must* use a space after the [ to avoid freaking out
Lua's parser if the inner expression is a long string. Lua
parses x[[[y]]] as x("[y]"), not as x["y"]
return (new Lua Code from %tree ["[ ", %key_lua, "]=", %value_lua])
else:
return (new Lua Code from %tree ["[", %key_lua, "]=", %value_lua])
"IndexChain":
%lua = (compile %tree.1 using %compile_actions)
unless %lua.is_value:
compile error at %tree.1 "\
..Can't index into this, since it's not an expression."
%first_char = "\%lua".1
if (any of [%first_char == "{", %first_char == "\"", %first_char == "["]):
%lua::parenthesize
for %i in 2 to (size of %tree):
%key = %tree.%i
%key_lua = (compile %key using %compile_actions)
unless %key_lua.is_value:
compile error at %key "\
..Can't use this as an index, since it's not an expression."
%key_lua_str = "\%key_lua"
%lua_id = (%key_lua_str::matching "^['\"]([a-zA-Z_][a-zA-Z0-9_]*)['\"]$")
if:
%lua_id:
%lua::add [".", %lua_id]
(%key_lua_str.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"]
%lua::add ["[ ", %key_lua, " ]"]
else:
%lua::add ["[", %key_lua, "]"]
return %lua
"Number":
return (new Lua Value from %tree ["\(%tree.1)"])
"Var":
return (new Lua Value from %tree [%tree.1::as lua id])
"FileChunks":
barf "\
..Can't convert FileChunks to a single block of lua, since each chunk's \
..compilation depends on the earlier chunks"
"Comment":
# TODO: implement?
return (new Lua Code from %tree)
"Error":
barf "Can't compile errors"
else:
barf "Unknown type: \(%tree.type)"
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