diff options
Diffstat (limited to 'kconfiglib.py')
| -rw-r--r-- | kconfiglib.py | 25 |
1 files changed, 19 insertions, 6 deletions
diff --git a/kconfiglib.py b/kconfiglib.py index 8c5dcf6..a10cbdf 100644 --- a/kconfiglib.py +++ b/kconfiglib.py @@ -1397,6 +1397,8 @@ class Kconfig(object): # The functions below are just _next_token() with extra syntax checking. # Inlining _next_token() and _peek_token() into them saves a few % of # parsing time. + # + # See the 'Intro to expressions' section for what a constant symbol is. def _expect_sym(self): self._tokens_i += 1 @@ -1407,12 +1409,21 @@ class Kconfig(object): return token - def _expect_sym_and_eol(self): + def _expect_nonconst_sym(self): self._tokens_i += 1 token = self._tokens[self._tokens_i] - if not isinstance(token, Symbol): - self._parse_error("expected symbol") + if not isinstance(token, Symbol) or token.is_constant: + self._parse_error("expected nonconstant symbol") + + return token + + def _expect_nonconst_sym_and_eol(self): + self._tokens_i += 1 + token = self._tokens[self._tokens_i] + + if not isinstance(token, Symbol) or token.is_constant: + self._parse_error("expected nonconstant symbol") if self._tokens[self._tokens_i + 1] is not None: self._parse_error("extra tokens at end of line") @@ -1527,7 +1538,7 @@ class Kconfig(object): if t0 in (_T_CONFIG, _T_MENUCONFIG): # The tokenizer allocates Symbol objects for us - sym = self._expect_sym_and_eol() + sym = self._expect_nonconst_sym_and_eol() self.defined_syms.append(sym) node = MenuNode() @@ -1777,13 +1788,15 @@ class Kconfig(object): if not isinstance(node.item, Symbol): self._parse_error("only symbols can select") - selects.append((self._expect_sym(), self._parse_cond())) + selects.append((self._expect_nonconst_sym(), + self._parse_cond())) elif t0 == _T_IMPLY: if not isinstance(node.item, Symbol): self._parse_error("only symbols can imply") - implies.append((self._expect_sym(), self._parse_cond())) + implies.append((self._expect_nonconst_sym(), + self._parse_cond())) elif t0 == _T_DEFAULT: defaults.append((self._parse_expr(False), self._parse_cond())) |