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TegraExplorer/ts-minifier.py

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# Copyright (c) 2021 bleck9999
# https://github.com/bleck9999/ts-minifier
# Version: 49befe92
import argparse
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import itertools
import logging
from os import path
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from string import ascii_letters, digits, hexdigits
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auto_replace = False
verbose = False
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stdlib = ['if', 'while', 'print', 'println', 'mountsys', 'mountemu', 'readsave', 'exit', 'break', 'dict', 'setpixel',
'readdir', 'copyfile', 'mkdir', 'ncatype', 'pause', 'color', 'menu', 'emu', 'clear', 'timer', 'deldir',
'fsexists', 'delfile', 'copydir', 'movefile', 'payload', 'readfile', 'writefile', 'setpixels', 'printpos',
'emmcread', 'emmcwrite', 'emummcread', 'emummcwrite', 'escapepath', 'combinepath', 'cwd', 'power',
'fuse_patched', 'fuse_hwtype', 'hidread']
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class Code:
def __init__(self, strings, comments, script):
counter = 0
strings_comments = sorted(strings + comments)
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bound = 0
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code = []
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for strcom in strings_comments:
code.append((bound, strcom[0], script[bound:strcom[0]]))
bound = strcom[1]
code.append((bound, len(script), script[bound:]))
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self.sections = sorted(strings_comments + code)
self.strings = strings
self.comments = comments
self.code = code
self.varstrs = []
self.rawcode = "".join([x[2] for x in sorted(self.code + self.strings)])
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def isidentifier(s: str):
for c in s:
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if c not in (ascii_letters + '_' + digits):
return False
return True
def iswhitespace(s: str):
for c in s:
if c not in (' ', '\t', '\n'):
return False
return True
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def hascomment(s: str):
quoted = False
for c in range(len(s)):
if s[c] == '"':
quoted = not quoted
if s[c] == '#' and not quoted:
return c
return None
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def parser(script: str):
comments = [] # [(start, end, content)]
strings = []
commented = False
quoted = False
strstart = -1
commentstart = -1
for c in range(len(script)):
if script[c] == '#' and not quoted:
commented = True
commentstart = c
elif (script[c] == '\n' and not quoted) and commented:
comments.append((commentstart, c + 1, script[commentstart:c + 1]))
commented = False
elif script[c] == '"' and not commented:
if not quoted:
strstart = c
quoted = True
else:
strings.append((strstart, c + 1, script[strstart:c + 1]))
quoted = False
script = Code(strings, comments, script)
# couple notes:
# we minify the script a little before parsing, so there is no unnecessary whitespace or comments
# we are assuming the input script is valid syntax
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userobjects = {}
usages = {}
hexxed = False
ismember = False
quoted = False
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strscript = script.rawcode + ' '
# the space will get removed after the second pass of whitespacent, but for now it prevents not detecting the
# last identifier in a script (eg if script.rawcode was "a=12" the 12 wouldn't be detected without the trailing ' ')
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start = len(strscript) + 1
for ch in range(len(strscript)):
if (strscript[ch - 1] == '0' and strscript[ch] == 'x') and not quoted:
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hexxed = True
elif isidentifier(strscript[ch]) and not (hexxed or quoted):
if start > ch:
start = ch
else:
pass
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elif hexxed and strscript[ch] not in hexdigits:
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hexxed = False
elif strscript[ch] == '"':
quoted = not quoted
elif not quoted:
if start != len(strscript) + 1 and not ismember: # if we actually had an identifier before this char
identifier = strscript[start:ch] # and this isnt a member of anything
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if identifier in usages:
usages[identifier].append(start)
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elif identifier.isnumeric(): # numbers are legally valid identifiers because fuckyou
usages[identifier] = [start]
userobjects[identifier] = "INT"
elif identifier == "0x":
pass
elif strscript[ch] == '=' and strscript[ch + 1] != '=':
isfunc = strscript[ch + 1] == '{'
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userobjects[identifier] = "func" if isfunc else "var"
usages[identifier] = [start] # declaration is a usage because i cant be arsed
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else: # not an assignment (or member) but also haven't seen this name before
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usages[identifier] = [start]
# fuck it we are using a fucking list of fucking stdlib functions i just fucking cant im adding tsv3
# to the fucking esolangs wiki have a good day
if identifier not in stdlib:
userobjects[identifier] = "var"
if strscript[ch] == '.':
ismember = True
elif strscript[ch] == '(':
if ismember:
if "foreach" == strscript[start:ch]: # array.foreach takes a variable name as an arg (blame meme)
for i, string in enumerate(script.strings):
if string[0] == ch + (script.comments[-1][1] if script.comments else 0) + 1:
script.varstrs.append(string)
script.strings.pop(i)
break
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else:
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ismember = False
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pass
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elif strscript[ch] in ')}]':
ismember = strscript[ch + 1] == '.'
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start = len(strscript) + 1
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return script, userobjects, usages
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def minify(script: Code, userobjects, usages):
# the space saved by an alias is the amount of characters currently used by calling the function (uses*len(func))
# minus the amount of characters it would take to define an alias (len(alias)+len(func)+2), with the 2 being for the
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# equals and the whitespace needed for a definition
# the same principle also applies to introducing a variable for string literals, though since a literal requires
# having "s around it then it's uses*(len(str)+2) - (len(minName)+len(str)+4) instead
# ^ 2 for = and whitespace, 2 for ""
#
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# obviously for a rename you're already defining it so it's just the difference between lengths multiplied by uses
short_idents = [x for x in (ascii_letters + '_')] + \
[x[0] + x[1] for x in itertools.product(ascii_letters + '_', repeat=2)]
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short_idents.pop(short_idents.index("if"))
mcode = script.rawcode
aliases = []
logging.info("Renaming user functions and variables" if auto_replace else
"Checking user function and variable names")
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for uo in [x for x in userobjects]:
if userobjects[uo] not in ["var", "func"]:
continue
tmpcode = ""
otype = userobjects[uo]
uses = len(usages[uo])
uolen = len(uo)
if uolen > 1:
candidates = short_idents
minName = ''
if uolen == 2:
candidates = short_idents[:53]
for i in candidates:
if i not in userobjects:
minName = i
userobjects[minName] = "TRN"
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break
if not minName:
logging.info(f"{'Function' if otype == 'func' else 'Variable'} name {uo} could be shortened but "
f"no available names found (would save {uses} bytes)")
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continue
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# we assume that nobody is insane enough to exhaust all *2,808* 2 character names,
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# instead that uo is len 2 and all the 1 character names are in use (because of that we dont multiply
# uses by anything as multiplying by a difference of 1 would be redundant)
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if not auto_replace:
logging.warning(
f"{'Function' if otype == 'func' else 'Variable'} name {uo} could be shortened ({uo}->{minName}, "
f"would save {uses * (uolen - len(minName))} bytes)")
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continue
else:
logging.info(f"Renaming {'Function' if otype == 'func' else 'Variable'} {uo} to {minName} "
f"(saving {uses * (uolen - len(minName))} bytes)")
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diff = uolen - len(minName)
# the foreach syntax is literally the worst part of ts
if otype == "var":
struo = f'"{uo}"'
for varstr in script.varstrs:
if varstr[2] == struo:
logging.info(f"Replacing declaration of {varstr[2]} at {varstr[0]}-{varstr[1]}")
start = varstr[0] - (script.comments[-1][1] if script.comments else 0)
end = varstr[1] - (script.comments[-1][1] if script.comments else 0)
newend = start + len(minName)
mcode = mcode[:newend] + f'{minName}"' + (' ' * diff) + mcode[end:]
# rather than just blindly str.replace()ing we're going to actually use the character indices that we stored
prev = 0
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for bound in usages[uo]:
tmpcode += mcode[prev:bound] + minName + ' ' * diff
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prev = bound + diff + len(minName)
# actually shut up about "bound might be referenced before assignment" or show me what possible
# execution path that could lead to usages[uo] being an empty list
mcode = tmpcode + mcode[bound + diff + len(minName):]
logging.info("Aliasing standard library functions" if auto_replace else
"Checking for standard library aliases")
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for func in usages:
tmpcode = ""
candidates = short_idents
minName = ''
savings = 0
uses = len(usages[func])
if func in userobjects or uses < 2: # we only want stdlib functions used more than once
continue
elif func == "if":
candidates = short_idents[:53]
savings = uses * 2 - 5 # the 5 is how many characters an alias declaration would use (a=if<space>)
for i in candidates:
if i not in userobjects:
minName = i
break
# once again we assume it's only `if` that could trigger this message
# 4 is the minimum amount of uses needed to save space, 1*(uses - 4) is the space it would save
if not minName and uses > 4:
logging.info(f"Standard library function {func} could be aliased but no available names found "
f"(would save {uses - 4} bytes)")
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else:
if not savings:
savings = uses * len(func) - (len(func) + len(minName) + 2)
if savings > 0:
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userobjects[minName] = "TRP"
if auto_replace:
logging.info(f"Aliasing standard library function {func} to {minName} (saving {savings} bytes)")
diff = len(func) - len(minName)
prev = 0
for bound in usages[func]:
tmpcode += mcode[prev:bound] + minName + ' ' * diff
prev = bound + diff + len(minName)
mcode = tmpcode + mcode[bound + diff + len(minName):]
aliases.append(f"{minName}={func} ")
else:
logging.warning(f"Not aliasing standard library function {func} (would save {savings} bytes)")
else:
logging.info(f"Not aliasing standard library function {func} (would save {savings} bytes)")
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str_reuse = {}
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for string in script.strings:
if string[2] in str_reuse:
str_reuse[string[2]].append(string[0])
else:
str_reuse[string[2]] = [string[0]]
logging.info("Introducing variables for reused literals" if auto_replace else
"Checking for reused literals")
for string in str_reuse:
if string == '"BYTE[]"':
# the type specifier for byte arrays is special because it has to be a literal
# if it's a variable then it tries to treat it as a string array then shits the bed if the other items are not strings
continue
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tmpcode = ""
candidates = short_idents
minName = ""
uses = len(str_reuse[string])
if uses > 1:
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if len(string) == 2:
candidates = short_idents[:53]
for i in candidates:
if i not in userobjects:
minName = i
break
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if not minName:
savings = len(string) * uses - (len(string) + 5) # 5 comes from id="{string}"
logging.info(f"Could introduce variable for reused string {string} but no available names found "
f"(would save {savings} bytes)")
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continue
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# the quotation marks are included in string
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savings = uses * len(string) - (len(string) + len(minName) + 2)
if savings > 0:
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userobjects[minName] = "TIV"
if auto_replace:
# "duplicated code fragment" do i look like i give a shit
logging.info(f"Introducing variable {minName} with value {string} (saving {savings} bytes)")
diff = len(string) - len(minName)
prev = 0
for bound in str_reuse[string]:
bound -= script.comments[-1][1] if script.comments else 0
tmpcode += mcode[prev:bound] + minName + ' ' * diff
prev = bound + diff + len(minName)
mcode = tmpcode + mcode[bound + diff + len(minName):]
aliases.append(f"{minName}={string}")
else:
logging.warning(f"Not introducing variable for string {string} reused {uses} times "
f"(would save {savings} bytes)")
else:
logging.info(f"Not introducing variable for string {string} reused {uses} times "
f"(would save {savings} bytes)")
else:
logging.info(f"Not introducing variable for string {string} (only used once)")
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for uint in [x for x in userobjects]:
if userobjects[uint] != "INT" or len(uint) < 2:
continue
candidates = short_idents
uses = len(usages[uint])
uilen = len(uint)
minName = ""
tmpcode = ""
if uses > 1:
if uilen == 2:
candidates = short_idents[:53]
for i in candidates:
if i not in userobjects:
minName = i
break
if not minName:
# yet another case of "nobody could possibly use up all the 2 char names we hope"
savings = uilen * uses - (uilen + 4) # 4 comes from id={uint}<whitespace>
logging.info(f"Could introduce variable for reused integer {uint} but no available names found "
f"(would save {savings} bytes)")
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continue
savings = uilen * uses - (uilen + len(minName) + 2)
if savings > 0:
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userobjects[minName] = "TIV"
if auto_replace:
logging.info(f"Introducing variable {minName} with value {uint} (saving {savings} bytes)")
diff = len(uint) - len(minName)
prev = 0
for bound in usages[uint]:
tmpcode += mcode[prev:bound] + minName + ' ' * diff
prev = bound + diff + len(minName)
mcode = tmpcode + mcode[bound + diff + len(minName):]
aliases.append(f"{minName}={uint} ")
else:
logging.warning(f"Not introducing variable for integer {uint} reused {uses} times "
f"(would save {savings} bytes)")
else:
logging.info(f"Not introducing variable for integer {uint} reused {uses} times "
f"(would save {savings} bytes)")
else:
logging.info(f"Not introducing variable for integer {uint} (only used once)")
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logging.info("Reintroducing REQUIREs")
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mcode = "".join([x[2] for x in script.comments]) + "".join(aliases) + mcode
return mcode
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def whitespacent(script: str):
# also removes unneeded comments and pushes REQUIREs to the top of the file
requires = ""
mcode = ""
for line in script.split(sep='\n'):
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start = hascomment(line)
if start is None:
start = -1
if "REQUIRE " in line[start:]:
requires += line[start:] + '\n' # leave REQUIREs unmodified
# comments are terminated by a newline so we need to add one back in
# *deep breath*
# slicing is exclusive on the right side of the colon so the "no comment" value of start=-1 would cut off
# the last character of the line which would lead to several issues
# however this is desirable when there *is* a comment, since it being exclusive means there isn't a trailing #
# and if you're wondering about the above check that uses line[start:] this doesn't matter,
# one character cant contain an 8 character substring so it's not like it'll ever false positive
if start != -1:
line = line[:start]
line = line.split(sep='"')
if len(line) % 2 == 0:
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raise Exception("Unmatched quote or hard newline in string")
part = 0
while part < len(line):
# all the odd numbered indexes should be inside quotes
if part % 2 == 0:
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if line[part] and not iswhitespace(line[part]):
# turn lots of whitespace into one whitespace with one easy trick!
mcode += ' '.join(line[part].split()) + ' '
else:
mcode += f'"{line[part]}"'
part += 1
# tsv3 is still an absolute nightmare
# so spaces should be preserved under two situations
# 1. the subtraction operator which requires space between the right operand but only if the right operand is a literal
# 2. between 2 characters that are valid identifiers (aA-zZ, _ or integers)
inquote = False
mmcode = ""
index = 0
newline = list(mcode)
while index < (len(mcode) - 3):
sec = mcode[index:index + 3]
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if sec[1] == '"':
inquote = not inquote
if (sec[1] == ' ') and not inquote:
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if (isidentifier(sec[0]) or sec[0].isnumeric()) and (isidentifier(sec[2]) or sec[2].isnumeric()):
pass
elif sec[0] == '-' and sec[2].isnumeric():
pass
else:
newline[index + 1] = ''
index += 1
mmcode += ''.join(newline).strip()
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return requires + mmcode.strip().replace('\n', ' ')
if __name__ == '__main__':
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argparser = argparse.ArgumentParser(description="Minify tsv3 scripts, useful for embedding",
formatter_class=argparse.RawTextHelpFormatter)
argparser.add_argument("source", type=str, nargs='+', help="source files to minify")
argparser.add_argument("-d", type=str, nargs='?', help="destination folder for minified scripts"
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"\ndefault: .", default='.')
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argparser.add_argument("--auto-replace", action="store_true", default=False,
help="automatically replace reused functions, variables and strings instead of just warning\n"
"and attempt to generate shorter names for reused variables \ndefault: false")
argparser.add_argument("-v", action="store_true", default=False,
help="prints even more information to the console than usual")
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argparser.add_argument("--such-meme", action="store_true", default=False,
help="replaces destination file if it already exists \ndefault: false")
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args = argparser.parse_args()
files = args.source
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dest = args.d
auto_replace = args.auto_replace
verbose = "INFO" if args.v else "WARNING"
logging.basicConfig(level=verbose, format="{message}", style='{')
print(f"Automatic replacement: {'ENABLED' if auto_replace else 'DISABLED'}")
for file in files:
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print(f"\nMinifying {file}")
with open(file, 'r') as f:
logging.info("Stripping comments and whitespace (pass 1)")
r = whitespacent(f.read())
logging.info("Parsing file")
r = parser(r)
logging.info("Searching for optimisations")
r = minify(r[0], r[1], r[2])
logging.info("Stripping whitespace (pass 2)")
r = whitespacent(r)
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file = path.splitext(path.basename(file))[0]
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if path.exists(path.join(dest, f"{file}.te")) and not args.such_meme:
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f = open(path.join(dest, f"{file}_min.te"), 'w')
else:
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f = open(path.join(dest, f"{file}.te"), 'w')
logging.info(f"Writing to {f.name}")
f.write(r)
print("Done!")
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f.close()