mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-12-26 13:36:28 +00:00
640436d7af
- make install && man $(llvm-config --prefix)/share/man/man1/lit.1 for more information. llvm-svn: 81190
347 lines
11 KiB
Python
347 lines
11 KiB
Python
import itertools
|
|
|
|
import Util
|
|
from ShCommands import Command, Pipeline, Seq
|
|
|
|
class ShLexer:
|
|
def __init__(self, data, win32Escapes = False):
|
|
self.data = data
|
|
self.pos = 0
|
|
self.end = len(data)
|
|
self.win32Escapes = win32Escapes
|
|
|
|
def eat(self):
|
|
c = self.data[self.pos]
|
|
self.pos += 1
|
|
return c
|
|
|
|
def look(self):
|
|
return self.data[self.pos]
|
|
|
|
def maybe_eat(self, c):
|
|
"""
|
|
maybe_eat(c) - Consume the character c if it is the next character,
|
|
returning True if a character was consumed. """
|
|
if self.data[self.pos] == c:
|
|
self.pos += 1
|
|
return True
|
|
return False
|
|
|
|
def lex_arg_fast(self, c):
|
|
# Get the leading whitespace free section.
|
|
chunk = self.data[self.pos - 1:].split(None, 1)[0]
|
|
|
|
# If it has special characters, the fast path failed.
|
|
if ('|' in chunk or '&' in chunk or
|
|
'<' in chunk or '>' in chunk or
|
|
"'" in chunk or '"' in chunk or
|
|
'\\' in chunk):
|
|
return None
|
|
|
|
self.pos = self.pos - 1 + len(chunk)
|
|
return chunk
|
|
|
|
def lex_arg_slow(self, c):
|
|
if c in "'\"":
|
|
str = self.lex_arg_quoted(c)
|
|
else:
|
|
str = c
|
|
while self.pos != self.end:
|
|
c = self.look()
|
|
if c.isspace() or c in "|&":
|
|
break
|
|
elif c in '><':
|
|
# This is an annoying case; we treat '2>' as a single token so
|
|
# we don't have to track whitespace tokens.
|
|
|
|
# If the parse string isn't an integer, do the usual thing.
|
|
if not str.isdigit():
|
|
break
|
|
|
|
# Otherwise, lex the operator and convert to a redirection
|
|
# token.
|
|
num = int(str)
|
|
tok = self.lex_one_token()
|
|
assert isinstance(tok, tuple) and len(tok) == 1
|
|
return (tok[0], num)
|
|
elif c == '"':
|
|
self.eat()
|
|
str += self.lex_arg_quoted('"')
|
|
elif not self.win32Escapes and c == '\\':
|
|
# Outside of a string, '\\' escapes everything.
|
|
self.eat()
|
|
if self.pos == self.end:
|
|
Util.warning("escape at end of quoted argument in: %r" %
|
|
self.data)
|
|
return str
|
|
str += self.eat()
|
|
else:
|
|
str += self.eat()
|
|
return str
|
|
|
|
def lex_arg_quoted(self, delim):
|
|
str = ''
|
|
while self.pos != self.end:
|
|
c = self.eat()
|
|
if c == delim:
|
|
return str
|
|
elif c == '\\' and delim == '"':
|
|
# Inside a '"' quoted string, '\\' only escapes the quote
|
|
# character and backslash, otherwise it is preserved.
|
|
if self.pos == self.end:
|
|
Util.warning("escape at end of quoted argument in: %r" %
|
|
self.data)
|
|
return str
|
|
c = self.eat()
|
|
if c == '"': #
|
|
str += '"'
|
|
elif c == '\\':
|
|
str += '\\'
|
|
else:
|
|
str += '\\' + c
|
|
else:
|
|
str += c
|
|
Util.warning("missing quote character in %r" % self.data)
|
|
return str
|
|
|
|
def lex_arg_checked(self, c):
|
|
pos = self.pos
|
|
res = self.lex_arg_fast(c)
|
|
end = self.pos
|
|
|
|
self.pos = pos
|
|
reference = self.lex_arg_slow(c)
|
|
if res is not None:
|
|
if res != reference:
|
|
raise ValueError,"Fast path failure: %r != %r" % (res, reference)
|
|
if self.pos != end:
|
|
raise ValueError,"Fast path failure: %r != %r" % (self.pos, end)
|
|
return reference
|
|
|
|
def lex_arg(self, c):
|
|
return self.lex_arg_fast(c) or self.lex_arg_slow(c)
|
|
|
|
def lex_one_token(self):
|
|
"""
|
|
lex_one_token - Lex a single 'sh' token. """
|
|
|
|
c = self.eat()
|
|
if c in ';!':
|
|
return (c,)
|
|
if c == '|':
|
|
if self.maybe_eat('|'):
|
|
return ('||',)
|
|
return (c,)
|
|
if c == '&':
|
|
if self.maybe_eat('&'):
|
|
return ('&&',)
|
|
if self.maybe_eat('>'):
|
|
return ('&>',)
|
|
return (c,)
|
|
if c == '>':
|
|
if self.maybe_eat('&'):
|
|
return ('>&',)
|
|
if self.maybe_eat('>'):
|
|
return ('>>',)
|
|
return (c,)
|
|
if c == '<':
|
|
if self.maybe_eat('&'):
|
|
return ('<&',)
|
|
if self.maybe_eat('>'):
|
|
return ('<<',)
|
|
return (c,)
|
|
|
|
return self.lex_arg(c)
|
|
|
|
def lex(self):
|
|
while self.pos != self.end:
|
|
if self.look().isspace():
|
|
self.eat()
|
|
else:
|
|
yield self.lex_one_token()
|
|
|
|
###
|
|
|
|
class ShParser:
|
|
def __init__(self, data, win32Escapes = False):
|
|
self.data = data
|
|
self.tokens = ShLexer(data, win32Escapes = win32Escapes).lex()
|
|
|
|
def lex(self):
|
|
try:
|
|
return self.tokens.next()
|
|
except StopIteration:
|
|
return None
|
|
|
|
def look(self):
|
|
next = self.lex()
|
|
if next is not None:
|
|
self.tokens = itertools.chain([next], self.tokens)
|
|
return next
|
|
|
|
def parse_command(self):
|
|
tok = self.lex()
|
|
if not tok:
|
|
raise ValueError,"empty command!"
|
|
if isinstance(tok, tuple):
|
|
raise ValueError,"syntax error near unexpected token %r" % tok[0]
|
|
|
|
args = [tok]
|
|
redirects = []
|
|
while 1:
|
|
tok = self.look()
|
|
|
|
# EOF?
|
|
if tok is None:
|
|
break
|
|
|
|
# If this is an argument, just add it to the current command.
|
|
if isinstance(tok, str):
|
|
args.append(self.lex())
|
|
continue
|
|
|
|
# Otherwise see if it is a terminator.
|
|
assert isinstance(tok, tuple)
|
|
if tok[0] in ('|',';','&','||','&&'):
|
|
break
|
|
|
|
# Otherwise it must be a redirection.
|
|
op = self.lex()
|
|
arg = self.lex()
|
|
if not arg:
|
|
raise ValueError,"syntax error near token %r" % op[0]
|
|
redirects.append((op, arg))
|
|
|
|
return Command(args, redirects)
|
|
|
|
def parse_pipeline(self):
|
|
negate = False
|
|
if self.look() == ('!',):
|
|
self.lex()
|
|
negate = True
|
|
|
|
commands = [self.parse_command()]
|
|
while self.look() == ('|',):
|
|
self.lex()
|
|
commands.append(self.parse_command())
|
|
return Pipeline(commands, negate)
|
|
|
|
def parse(self):
|
|
lhs = self.parse_pipeline()
|
|
|
|
while self.look():
|
|
operator = self.lex()
|
|
assert isinstance(operator, tuple) and len(operator) == 1
|
|
|
|
if not self.look():
|
|
raise ValueError, "missing argument to operator %r" % operator[0]
|
|
|
|
# FIXME: Operator precedence!!
|
|
lhs = Seq(lhs, operator[0], self.parse_pipeline())
|
|
|
|
return lhs
|
|
|
|
###
|
|
|
|
import unittest
|
|
|
|
class TestShLexer(unittest.TestCase):
|
|
def lex(self, str, *args, **kwargs):
|
|
return list(ShLexer(str, *args, **kwargs).lex())
|
|
|
|
def test_basic(self):
|
|
self.assertEqual(self.lex('a|b>c&d<e'),
|
|
['a', ('|',), 'b', ('>',), 'c', ('&',), 'd',
|
|
('<',), 'e'])
|
|
|
|
def test_redirection_tokens(self):
|
|
self.assertEqual(self.lex('a2>c'),
|
|
['a2', ('>',), 'c'])
|
|
self.assertEqual(self.lex('a 2>c'),
|
|
['a', ('>',2), 'c'])
|
|
|
|
def test_quoting(self):
|
|
self.assertEqual(self.lex(""" 'a' """),
|
|
['a'])
|
|
self.assertEqual(self.lex(""" "hello\\"world" """),
|
|
['hello"world'])
|
|
self.assertEqual(self.lex(""" "hello\\'world" """),
|
|
["hello\\'world"])
|
|
self.assertEqual(self.lex(""" "hello\\\\world" """),
|
|
["hello\\world"])
|
|
self.assertEqual(self.lex(""" he"llo wo"rld """),
|
|
["hello world"])
|
|
self.assertEqual(self.lex(""" a\\ b a\\\\b """),
|
|
["a b", "a\\b"])
|
|
self.assertEqual(self.lex(""" "" "" """),
|
|
["", ""])
|
|
self.assertEqual(self.lex(""" a\\ b """, win32Escapes = True),
|
|
['a\\', 'b'])
|
|
|
|
class TestShParse(unittest.TestCase):
|
|
def parse(self, str):
|
|
return ShParser(str).parse()
|
|
|
|
def test_basic(self):
|
|
self.assertEqual(self.parse('echo hello'),
|
|
Pipeline([Command(['echo', 'hello'], [])], False))
|
|
self.assertEqual(self.parse('echo ""'),
|
|
Pipeline([Command(['echo', ''], [])], False))
|
|
|
|
def test_redirection(self):
|
|
self.assertEqual(self.parse('echo hello > c'),
|
|
Pipeline([Command(['echo', 'hello'],
|
|
[((('>'),), 'c')])], False))
|
|
self.assertEqual(self.parse('echo hello > c >> d'),
|
|
Pipeline([Command(['echo', 'hello'], [(('>',), 'c'),
|
|
(('>>',), 'd')])], False))
|
|
self.assertEqual(self.parse('a 2>&1'),
|
|
Pipeline([Command(['a'], [(('>&',2), '1')])], False))
|
|
|
|
def test_pipeline(self):
|
|
self.assertEqual(self.parse('a | b'),
|
|
Pipeline([Command(['a'], []),
|
|
Command(['b'], [])],
|
|
False))
|
|
|
|
self.assertEqual(self.parse('a | b | c'),
|
|
Pipeline([Command(['a'], []),
|
|
Command(['b'], []),
|
|
Command(['c'], [])],
|
|
False))
|
|
|
|
self.assertEqual(self.parse('! a'),
|
|
Pipeline([Command(['a'], [])],
|
|
True))
|
|
|
|
def test_list(self):
|
|
self.assertEqual(self.parse('a ; b'),
|
|
Seq(Pipeline([Command(['a'], [])], False),
|
|
';',
|
|
Pipeline([Command(['b'], [])], False)))
|
|
|
|
self.assertEqual(self.parse('a & b'),
|
|
Seq(Pipeline([Command(['a'], [])], False),
|
|
'&',
|
|
Pipeline([Command(['b'], [])], False)))
|
|
|
|
self.assertEqual(self.parse('a && b'),
|
|
Seq(Pipeline([Command(['a'], [])], False),
|
|
'&&',
|
|
Pipeline([Command(['b'], [])], False)))
|
|
|
|
self.assertEqual(self.parse('a || b'),
|
|
Seq(Pipeline([Command(['a'], [])], False),
|
|
'||',
|
|
Pipeline([Command(['b'], [])], False)))
|
|
|
|
self.assertEqual(self.parse('a && b || c'),
|
|
Seq(Seq(Pipeline([Command(['a'], [])], False),
|
|
'&&',
|
|
Pipeline([Command(['b'], [])], False)),
|
|
'||',
|
|
Pipeline([Command(['c'], [])], False)))
|
|
|
|
if __name__ == '__main__':
|
|
unittest.main()
|