in resources/perf.webkit.org/tools/jsmin.py [0:0]
def minify(self, instream=None, outstream=None):
if instream and outstream:
self.ins, self.outs = instream, outstream
self.is_return = False
self.return_buf = ''
def write(char):
# all of this is to support literal regular expressions.
# sigh
if char in 'return':
self.return_buf += char
self.is_return = self.return_buf == 'return'
self.outs.write(char)
if self.is_return:
self.return_buf = ''
read = self.ins.read
space_strings = "abcdefghijklmnopqrstuvwxyz"\
"ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_$\\"
starters, enders = '{[(+-', '}])+-"\''
newlinestart_strings = starters + space_strings
newlineend_strings = enders + space_strings
do_newline = False
do_space = False
escape_slash_count = 0
doing_single_comment = False
previous_before_comment = ''
doing_multi_comment = False
in_re = False
in_quote = ''
quote_buf = []
previous = read(1)
if previous == '\\':
escape_slash_count += 1
next1 = read(1)
if previous == '/':
if next1 == '/':
doing_single_comment = True
elif next1 == '*':
doing_multi_comment = True
previous = next1
next1 = read(1)
else:
write(previous)
elif not previous:
return
elif previous >= '!':
if previous in "'\"":
in_quote = previous
write(previous)
previous_non_space = previous
else:
previous_non_space = ' '
if not next1:
return
while 1:
next2 = read(1)
if not next2:
last = next1.strip()
if not (doing_single_comment or doing_multi_comment)\
and last not in ('', '/'):
if in_quote:
write(''.join(quote_buf))
write(last)
break
if doing_multi_comment:
if next1 == '*' and next2 == '/':
doing_multi_comment = False
next2 = read(1)
elif doing_single_comment:
if next1 in '\r\n':
doing_single_comment = False
while next2 in '\r\n':
next2 = read(1)
if not next2:
break
if previous_before_comment in ')}]':
do_newline = True
elif previous_before_comment in space_strings:
write('\n')
elif in_quote:
quote_buf.append(next1)
if next1 == in_quote:
numslashes = 0
for c in reversed(quote_buf[:-1]):
if c != '\\':
break
else:
numslashes += 1
if numslashes % 2 == 0:
in_quote = ''
write(''.join(quote_buf))
elif next1 in '\r\n':
if previous_non_space in newlineend_strings \
or previous_non_space > '~':
while 1:
if next2 < '!':
next2 = read(1)
if not next2:
break
else:
if next2 in newlinestart_strings \
or next2 > '~' or next2 == '/':
do_newline = True
break
elif next1 < '!' and not in_re:
if (previous_non_space in space_strings \
or previous_non_space > '~') \
and (next2 in space_strings or next2 > '~'):
do_space = True
elif previous_non_space in '-+' and next2 == previous_non_space:
# protect against + ++ or - -- sequences
do_space = True
elif self.is_return and next2 == '/':
# returning a regex...
write(' ')
elif next1 == '/':
if do_space:
write(' ')
if in_re:
if previous != '\\' or (not escape_slash_count % 2) or next2 in 'gimy':
in_re = False
write('/')
elif next2 == '/':
doing_single_comment = True
previous_before_comment = previous_non_space
elif next2 == '*':
doing_multi_comment = True
previous = next1
next1 = next2
next2 = read(1)
else:
in_re = previous_non_space in '(,=:[?!&|' or self.is_return # literal regular expression
write('/')
else:
if do_space:
do_space = False
write(' ')
if do_newline:
write('\n')
do_newline = False
write(next1)
if not in_re and next1 in "'\"`":
in_quote = next1
quote_buf = []
previous = next1
next1 = next2
if previous >= '!':
previous_non_space = previous
if previous == '\\':
escape_slash_count += 1
else:
escape_slash_count = 0