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villeador.py
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villeador.py
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#!/usr/bin/env python2.7
# C Minify Copyright (C) 2015 Alexandre Baron
# This program comes with ABSOLUTELY NO WARRANTY; for details read LICENSE.
# This is free software, and you are welcome to redistribute it
# under certain conditions; read LICENSE for details.
import argparse
import sys
import re
import os # SEEK_END etc.
# Ops: ops that may be spaced out in the code but we can trim the whitespace before and after
# Spaced ops are operators that we need to append with one trailing space because of their syntax (e.g. keywords).
# NB: theses ops are the SUPPORTED ones and these lists may not be complete as per the Standard
OPS = [
'+', '-', '*', '/', '%', '++', '--',
'+=', '-=', '*=', '/=', '%=', '=', '==', '!=',
'&&', '||', '!', '&', '|', '^', '<<', '>>',
'<', '>', '<=', '>=', '<<=', '>>=', '&=', '|=', '^=', ',',
'(', ')', '{', '}', ';', 'else', '?', ':'
]
SPACED_OPS = ['else']
UNARY_OPS= ["+", "-", "&", "!", "*"]
def remove_everything_between(subs1, subs2, line):
regex = re.compile(subs1 + r'.*' + subs2)
return regex.sub('', line)
def remove_everything_before(subs, line):
regex = re.compile(r'.*' + subs)
return regex.sub('', line)
def remove_everything_past(subs, line):
regex = re.compile(subs + r'.*')
return regex.sub('', line)
def remove_multiline_comments(lines):
start, end = '/*', '*/'
escaped_start, escaped_end = '/\*', '\*/'
in_comment = False
newlines = []
for line in lines:
if not in_comment:
start_pos = line.find(start)
if start_pos != -1:
in_comment = True
end_pos = line.find(end)
# inline multiline comment
if start_pos < end_pos:
line = remove_everything_between(escaped_start, escaped_end, line)
in_comment = False
else:
line = remove_everything_past(escaped_start, line)
else:
end_pos = line.find(end)
if end_pos != -1:
line = remove_everything_before(escaped_end, line)
in_comment = False
start_pos = line.find(start)
# start of another comment on the same line
if start_pos != -1:
line = remove_everything_past(escaped_start, line)
in_comment = True
else:
line = ''
newlines.append(line)
return newlines
def remove_inline_comments(lines):
return map(lambda x: remove_everything_past('//', x), lines)
def minify_operator(op):
"""Returns a function applying a regex to strip away spaces on each side of an operator
Makes a special escape for operators that could be mistaken for regex control characters."""
to_compile = " *{} *".format(re.escape(op))
regex = re.compile(to_compile)
repl = op
if op in SPACED_OPS:
repl += " "
return lambda string: regex.sub(repl, string)
def show_stats(source_file, minified_text):
# After "f.readlines", the file pointer is at file's end so tell() will return current file size.
orig_size = source_file.tell()
mini_size = len(minified_text)
delta = orig_size - mini_size
print(
"Original: {0} characters, Minified: {1} characters, {2} removed ({3:.1f}%)"
.format(orig_size, mini_size, delta, (float(delta) / float(orig_size)) * 100.0)
)
def fix_spaced_ops(minified_txt):
"""This will walk the spaced ops list and search the text for all "[OP] {" sequences occurrences
and replace them by "[OP]{" since there is no operator in the C syntax for which the spacing
between the op and the '{' is mandatory.
We do this because to manage spaced ops that may or may not be used with braces (e.g. "else"),
we may have added unnecessary spaces (e.g. because the brace was on next line),
so we can fix it here."""
for op in SPACED_OPS:
pattern = "{} {{".format(op) # {{ for literal braces
repl = "{}{{".format(op)
minified_txt = re.sub(pattern, repl, minified_txt)
return minified_txt
def fix_unary_operators(lines):
"""Ops processing can have eliminated necessary space when using unary ops
e.g. "#define ABC -1" becomes "#define ABC-1", because the unary '-' is being
mistaken for a binary '-', so the space has been trimmed.
We can fix this kind of thing here, but it pretty much highlights the limits of such
a parser..."""
regex_unary_ops = '[{}]'.format(''.join(UNARY_OPS))
regex_unary_ops = re.escape(regex_unary_ops)
# Use capture groups to separate, e.g. in "#define MACROVALUE", "#define MACRO" from "VALUE"
# pattern will detect problems like "#define FLUSH-2"
# Format braces here -----------v
pattern = "^(#[a-z]+ +[\w\d]+)([{}][\w\d]+)$".format(regex_unary_ops)
# Simply add one more space between macro name and value
repl = r'\1' + " " + r'\2'
# Process each preprocessor line and modify it inplace as we need to keep order
for (idx, line) in enumerate(lines):
if line.startswith('#'):
for op in UNARY_OPS:
line = re.sub(pattern, repl, line)
lines[idx] = line
return lines
def minify_source_file(args, filename):
with open(filename) as f:
if args.names is True:
print("File {}:".format(source_file))
lines = f.readlines()
if args.keep_newline is False:
# Keep preprocessor lines (starting with #)
lines = map(lambda x: x.replace(args.crlf, '') if not x.startswith('#') else x, lines)
lines = map(lambda x: x.replace('\t', ' '), lines)
# erase leading and trailing whitespace but do it BEFORE processing spaced ops!
# and specify only spaces so it doesn't strip newlines
lines = map(lambda x: x.strip(' '), lines)
# for each operator: remove space on each side of the op, on every line.
# Escape ops that could be regex control characters.
for op in OPS:
lines = map(minify_operator(op), lines)
if args.keep_inline is False:
lines = remove_inline_comments(lines)
if args.keep_multiline is False:
lines = remove_multiline_comments(lines)
# Finally convert all remaining multispaces to a single space
multi_spaces = re.compile(r'[ ]+ *')
lines = map(lambda string: multi_spaces.sub(' ', string), lines)
# Ops processing can have eliminated necessary space when using unary ops
# e.g. "#define ABC -1" becomes "#define ABC-1", so we can fix it here
lines = fix_unary_operators(lines)
minified = ''.join(lines)
# There is no syntactic requirement of an operator being spaced from a '{' in C so
# if we added unnecessary space when processing spaced ops, we can fix it here
minified = fix_spaced_ops(minified)
print(minified)
if args.stats is True:
show_stats(f, minified)
def get_args():
parser = argparse.ArgumentParser()
parser.add_argument("files", nargs='+', help="Input files")
parser.add_argument("-c", "--crlf",
help="Use CRLF as newline control character (\r\n)",
default='\n',
action='store_const', const='\r\n')
parser.add_argument("-n", "--names",
help="Show name of processed files",
action='store_true')
parser.add_argument("-s", "--stats",
help="Show statistics on minified version",
action='store_true')
parser.add_argument("-m", "--keep-multiline",
help="Don't strip multiline comments (/* ... */)",
action='store_true')
parser.add_argument("-i", "--keep-inline",
help="Do not strip inline comments (// ...)",
action='store_true')
parser.add_argument("-w", "--keep-newline",
help="Keep newline control characters",
action='store_true')
args = parser.parse_args()
return args
def main():
args = get_args()
for filename in args.files:
minify_source_file(args, filename)
if __name__ == "__main__":
main()