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|
# This file contains the code to convert syntax trees to Nomsu code
use "nomnom/code_obj.nom"
use "nomnom/parser.nom"
# TODO: maybe re-implement the fancy coroutine checker that aborts early if nomsu gets too long
action [decompile %tree inline]:
assume (%tree is a "Syntax Tree")
if %tree.type is:
"Action":
%nomsu = (Nomsu Code from %tree)
if %tree.target:
%target_nomsu = (decompile %tree.target inline)
if %tree.target.type is:
("Action", "Block"):
%target_nomsu::parenthesize
%nomsu::add [%target_nomsu, "::"]
for %bit in %tree at %i:
if (%bit is text):
unless (..)
any of [..]
%i == 1,
%tree.(%i - 1) isn't text,
(%bit::is a nomsu operator) == (%tree.(%i - 1)::is a nomsu operator)
..: %nomsu::add " "
%nomsu::add %bit
..else:
%arg_nomsu = (decompile %bit inline)
unless ((%i == (size of %tree)) and (%bit.type == "Block")):
%nomsu::add " "
if ((%bit.type == "Action") or (%bit.type == "Block")):
%arg_nomsu::parenthesize
%nomsu::add %arg_nomsu
return %nomsu
"EscapedNomsu":
%inner_nomsu = (decompile %tree.1 inline)
unless (..)
any of [..]
%tree.1.type == "List", %tree.1.type == "Dict",
%tree.1.type == "Var"
..: %inner_nomsu::parenthesize
%nomsu = (Nomsu Code from %tree ["\\", %inner_nomsu])
return %nomsu
"Block":
%nomsu = (Nomsu Code from %tree [":"])
for i,line in ipairs tree
%nomsu::add(i == 1 and " " or "; ")
%nomsu::add recurse(line, nomsu, i == 1 or i < #tree)
return %nomsu
"Text":
%nomsu = (Nomsu Code from %tree ["\""])
for %text in recursive %tree:
for %bit in %text at %i:
if:
(%bit is text):
%nomsu::add %bit
if %bit.type is:
"Text":
recurse %text on %bit
"Var":
%interp_nomsu = (decompile %bit inline)
# Make sure "...\(%x)y..." isn't confused with "...\(%xy)..."
# TODO: make this more robust against "...\%x\("y").."
if (..)
(%tree.(%i + 1) is text) and (..)
not (%tree.(%i + 1)::matches "^[ \n\t,.:;#(){}%[%]]")
..: %interp_nomsu::parenthesize
%nomsu::add ["\\", %interp_nomsu]
("List", "Dict"):
%nomsu::add ["\\", decompile %bit inline]
else:
%nomsu::add ["\\(", decompile %bit inline, ")"]
return (Nomsu Code from %tree ["\"", %nomsu, "\""])
("List", "Dict"):
%nomsu = (Nomsu Code from %tree ["[" if (%tree.type == "List") else "{"])
for %item in %tree at %i:
if (%i > 1): %nomsu::add ", "
%nomsu::add (decompile %item inline)
%nomsu::add ("]" if (%tree.type == "List") else "}")
return %nomsu
"DictEntry":
set {%key:%tree.1, %value:%tree.2}
if (all of [%key.type == "Text", (size of %key) == 1, %key.1::is a nomsu identifier]):
%nomsu = (Nomsu Code from %key [key.1])
..else:
%nomsu = (decompile %key inline)
if (%key.type == "Action"):
%nomsu::parenthesize
%nomsu::add ":"
if %value:
%nomsu::add (decompile %value inline)
return %nomsu
"IndexChain":
%nomsu = (Nomsu Code from %tree)
for %bit in %tree at %i:
if (%i > 1): nomsu::add "."
if (..)
all of [..]
%i > 1, %bit.type == "Text", (size of %bit) == 1, %bit.1 is text,
%bit.1::is a nomsu identifier
%nomsu::add %bit.1
..else:
%bit_nomsu = (decompile %bit inline)
if (..)
any of [..]
%bit.type == "Action"
%bit.type == "Block"
%bit.type == "IndexChain"
(%bit.type == "Number") and (%i < (size of %tree))
..: %bit_nomsu::parenthesize
%nomsu::add %bit_nomsu
return %nomsu
"Number":
return (Nomsu Code from %tree [(%tree.1 as hex) if %tree.hex else "\(%tree.1)"])
"Var":
return (Nomsu Code from %tree ["%\(%tree.1)"])
"Comment":
return (nil)
"FileChunks":
barf "Can't inline a FileChunks"
"Error":
barf "Can't compile errors"
else:
barf "Unknown type: \(%tree.type)"
%MAX_LINE = 90
action [decompile %tree]:
%nomsu = (Nomsu Code from %tree)
# For concision:
local action [recurse on %t]:
%space = (%MAX_LINE - (%nomsu::trailing line length))
if (%space <= 0): go to (Indented)
for %subtree in recursive %tree:
if %subtree.type is:
"Block":
if ((size of %subtree) > 1):
go to (Use Indented)
if ((size of "\(decompile %subtree inline)") > 20):
go to (Use Indented)
for %k = %v in %subtree:
if (%v is a "Syntax Tree"):
recurse %subtree on %v
%inline_nomsu = (decompile %t inline)
if (%inline_nomsu and ((size of "\%inline_nomsu") <= %space)):
return %inline_nomsu
=== (Use Indented) ===
%indented = (decompile %t)
if (%t.type == "Action"):
%indented = (Nomsu Code from %t ["(..)\n ", %indented])
return %indented
if %tree.type is:
"FileChunks":
local action [%1 and %2 should clump]:
if ((%1.type == "Action") and (%2.type == "Action")):
if (%1.stub == "use 1"): return (%2.stub == "use 1")
if (%1.stub == "test 1"): return (yes)
if (%2.stub == "test 1"): return (no)
return (not ((recurse on %1)::is multi-line))
for %chunk in %tree at %chunk_no:
if (%chunk_no > 1):
%nomsu::add "\n\n\("~"::* 80)\n\n"
%nomsu::add (pop comments at %chunk.source.start)
if (%chunk.type == "Block"):
for %line in %chunk at %line_no:
if (%line_no > 1):
if (%chunk.(%line_no - 1) and %line should clump):
%nomsu::add ["\n", pop comments at %line.source.start "\n"]
..else:
%nomsu::add ["\n\n", pop comments at %line.source.start]
%nomsu::add (decompile %line %pop_comments)
%nomsu::add (pop comments at %chunk.source.stop "\n")
..else:
%nomsu::add (decompile %chunk %pop_comments)
%nomsu::add (pop comments at %tree.source.stop "\n")
unless ("\%nomsu"::matches "\n$"):
%nomsu::add "\n"
return %nomsu
"Action":
%pos = %tree.source.start
%next_space = ""
if %tree.target:
%target_nomsu = (recurse on %tree.target)
if ((%tree.target.type == "Action") and (%target_nomsu::is one line)):
%target_nomsu::parenthesize
%nomsu::add %target_nomsu
%pos = %tree.target.source.stop
%next_space = ("\n..::" if (%target_nomsu::is multi-line) else "::")
for %bit in %tree at %i:
if ((%next_space == " ") and ((%nomsu::trailing line length) > %MAX_LINE)):
%next_space = " \\\n"
%nomsu::add %next_space
if (%bit is text):
unless (..)
all of [..]
%tree.(%i - 1) is text
(%tree.(%i - 1)::is a nomsu operator) != (%bit::is a nomsu operator)
..: %nomsu::add %next_space
%nomsu::add %bit
%next_space = " "
do next %bit
%bit_nomsu = (recurse on %bit)
if (%bit.type == "Comment"):
%next_space = "\n"
..else:
%next_space = (" " if (%bit_nomsu::is one line) else "\n..")
if (%bit.type == "Action"):
%bit_nomsu::parenthesize
return %nomsu
"EscapedNomsu":
%nomsu::add "\\"
%val_nomsu = (recurse on %tree.1)
if ((%tree.(1).type == "Action") and (%val_nomsu::is one line)):
%val_nomsu::parenthesize
%nomsu::add %val_nomsu
return %nomsu
"Block":
for %line in %tree at %i:
if ((%i > 1) and (%line.type == "Comment")):
%nomsu::add "\n"
%line_nomsu = (recurse on %line)
%nomsu::add
if (%i < (size of %tree)):
if ((%line_nomsu::number of lines) > 2):
%nomsu::add "\n\n"
..else:
%nomsu::add "\n"
return (Nomsu Code from %tree [":\n ", %nomsu])
"Text":
# Multi-line text has more generous wrap margins
%max_line = ((1.5 * %MAX_LINE) rounded down)
%nomsu = (Nomsu Code from %tree)
local action [add text from %tree]:
for %bit in %tree at %i:
if (%bit is text):
# TODO: escape properly?
%bit = (escape text %bit)
for %line in (%bit::lines) at %j:
if:
(%j > 1): nomsu::add "\n"
(((size of %line) > 10) and ((%nomsu::trailing line length) > %max_line)):
%nomsu::add "\\\n.."
while ((size of %line) > 0):
%space = (%max_line - (%nomsu::trailing line length))
%split = (%line::position of "[%p%s]" after %space)
if ((not %split) or (%split > %space + 10)):
%split = (%space + 10)
if ((%line - %split) < 10):
%split = (size of %line)
set {%bite:%line.[1, %split], %line:%line.[%split + 1, -1]}
%nomsu::add %bite
if ((size of %line) > 0):
%nomsu::add "\\\n.."
if (%bit.type == "Text"):
add text from %bit
..else:
%nomsu::add "\\"
%interp_nomsu = (recurse on %bit)
unless (%interp_nomsu::is multi-line):
if %bit.type is:
"Var":
if ((%tree.(%i+1) is text) and (not (%tree.(%i+1)::matches "^[ \n\t,.:#(){}[%]]"))):
%interp_nomsu::parenthesize
("List", "Dict"):
%interp_nomsu::parenthesize
%nomsu::add %interp_nomsu
if (%interp_nomsu::is multi-line):
%nomsu::add "\n.."
add text from %tree
return (Nomsu Code from %tree ["\"\\\n ..", %nomsu, "\""])
("List", "Dict"):
if ((size of %tree) == 0):
%nomsu::add ("[]" if (%tree.type == "List") else "{}")
return %nomsu
for %item in %tree at %i:
%item_nomsu = (decompile %item inline)
if ((not %item_nomsu) or ((size of "\%item_nomsu") > %MAX_LINE)):
%item_nomsu = (recurse on %item_nomsu)
%nomsu::add %item_nomsu
if (%i < (size of %tree)):
if (..)
(%item_nomsu::is multi-line) or (..)
(%nomsu::trailing line length) + (size of "\%item_nomsu")) >= %MAX_LINE
..: %nomsu::add "\n"
..else: %nomsu::add ", "
return (..)
Nomsu Code from %tree [..]
"[..]\n " if tree.type == "List" else "{..}\n "
%nomsu
"DictEntry":
set {%key:%tree.1, %value:%tree.2}
if (all of [%key.type == "Text", (size of %key) == 1, %key.1::is a nomsu identifier]):
%nomsu::add %key.1
..else:
%nomsu::add (decompile %key inline)
if ((%key.type == "Action") or (%key.type == "Block")):
%nomsu::parenthesize
%nomsu::add [": ", recurse on %value]
return %nomsu
"Comment":
%nomsu::add ["#", %tree.1::with "\n" -> "\n "]
return %nomsu
("IndexChain", "Number", "Var"):
return (decompile %tree inline)
"Error":
barf "Cannot decompile an error"
else:
barf "Unknown type: \(%tree.type)"
|
