def _NextOne(self, lex_mode=lex_mode_e.DBracket):
# type: (lex_mode_t) -> None
n = len(self.words)
if n == 2:
assert lex_mode == lex_mode_e.DBracket
self.words[0] = self.words[1]
self.cur_word = self.words[0]
self.words.pop()
elif n in (0, 1):
w = self.w_parser.ReadWord(lex_mode) # may raise
if n == 0:
self.words.append(w)
else:
self.words[0] = w
self.cur_word = w
assert self.cur_word is not None
self.op_id = word_.BoolId(self.cur_word)
self.b_kind = consts.GetKind(self.op_id)
def ParseFactor(self):
# type: () -> bool_expr_t
"""
Factor : WORD
| UNARY_OP WORD
| WORD BINARY_OP WORD
| '(' Expr ')'
"""
if self.b_kind == Kind.BoolUnary:
# Just save the type and not the token itself?
op = self.op_id
self._Next()
w = self.cur_word
# e.g. [[ -f < ]]. But [[ -f '<' ]] is OK
tag = w.tag_()
if tag != word_e.Compound and tag != word_e.String:
p_die('Invalid argument to unary operator', word=w)
self._Next()
node = bool_expr.Unary(op, w) # type: bool_expr_t
return node
if self.b_kind == Kind.Word:
# Peek ahead another token.
t2 = self._LookAhead()
t2_op_id = word_.BoolId(t2)
t2_b_kind = consts.GetKind(t2_op_id)
#log('t2 %s / t2_op_id %s / t2_b_kind %s', t2, t2_op_id, t2_b_kind)
# Op for < and >, -a and -o pun
if t2_b_kind == Kind.BoolBinary or t2_op_id in (Id.Op_Less,
Id.Op_Great):
left = self.cur_word
self._Next()
op = self.op_id
# TODO: Need to change to lex_mode_e.BashRegex.
# _Next(lex_mode) then?
is_regex = t2_op_id == Id.BoolBinary_EqualTilde
if is_regex:
self._Next(lex_mode=lex_mode_e.BashRegex)
else:
self._Next()
right = self.cur_word
if is_regex:
# NOTE: StaticEval for checking regex syntax isn't enough. We could
# need to pass do_ere so that the quoted parts get escaped.
#ok, s, unused_quoted = word_.StaticEval(right)
pass
self._Next()
return bool_expr.Binary(op, left, right)
else:
# [[ foo ]]
w = self.cur_word
self._Next()
return bool_expr.WordTest(w)
if self.op_id == Id.Op_LParen:
self._Next()
node = self.ParseExpr()
if self.op_id != Id.Op_RParen:
p_die('Expected ), got %s',
word_.Pretty(self.cur_word),
word=self.cur_word)
self._Next()
return node
# It's not WORD, UNARY_OP, or '('
p_die('Unexpected token in boolean expression', word=self.cur_word)