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python/Parser/grammar.c at master · java66liu/python · GitHub
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/* Grammar implementation */
#include
"Python.h"
#include
"pgenheaders.h"
#include
<ctype.h>
#include
"token.h"
#include
"grammar.h"
#ifdef
RISCOS
#include
<unixlib.h>
#endif
extern
int
Py_DebugFlag
;
grammar
*
newgrammar
(
int
start
)
{
grammar
*
g
;
g
=
(
grammar
*
)
PyObject_MALLOC
(
sizeof
(
grammar
));
if
(
g
==
NULL
)
Py_FatalError
(
"no mem for new grammar"
);
g
->
g_ndfas
=
0
;
g
->
g_dfa
=
NULL
;
g
->
g_start
=
start
;
g
->
g_ll
.
ll_nlabels
=
0
;
g
->
g_ll
.
ll_label
=
NULL
;
g
->
g_accel
=
0
;
return
g
;
}
dfa
*
adddfa
(
grammar
*
g
,
int
type
,
char
*
name
)
{
dfa
*
d
;
g
->
g_dfa
=
(
dfa
*
)
PyObject_REALLOC
(
g
->
g_dfa
,
sizeof
(
dfa
)
*
(
g
->
g_ndfas
+
1
));
if
(
g
->
g_dfa
==
NULL
)
Py_FatalError
(
"no mem to resize dfa in adddfa"
);
d
=
&
g
->
g_dfa
[
g
->
g_ndfas
++
];
d
->
d_type
=
type
;
d
->
d_name
=
strdup
(
name
);
d
->
d_nstates
=
0
;
d
->
d_state
=
NULL
;
d
->
d_initial
=
-1
;
d
->
d_first
=
NULL
;
return
d
;
/* Only use while fresh! */
}
int
addstate
(
dfa
*
d
)
{
state
*
s
;
d
->
d_state
=
(
state
*
)
PyObject_REALLOC
(
d
->
d_state
,
sizeof
(
state
)
*
(
d
->
d_nstates
+
1
));
if
(
d
->
d_state
==
NULL
)
Py_FatalError
(
"no mem to resize state in addstate"
);
s
=
&
d
->
d_state
[
d
->
d_nstates
++
];
s
->
s_narcs
=
0
;
s
->
s_arc
=
NULL
;
s
->
s_lower
=
0
;
s
->
s_upper
=
0
;
s
->
s_accel
=
NULL
;
s
->
s_accept
=
0
;
return
s
-
d
->
d_state
;
}
void
addarc
(
dfa
*
d
,
int
from
,
int
to
,
int
lbl
)
{
state
*
s
;
arc
*
a
;
assert
(
0
<=
from
&&
from
<
d
->
d_nstates
);
assert
(
0
<=
to
&&
to
<
d
->
d_nstates
);
s
=
&
d
->
d_state
[
from
];
s
->
s_arc
=
(
arc
*
)
PyObject_REALLOC
(
s
->
s_arc
,
sizeof
(
arc
)
*
(
s
->
s_narcs
+
1
));
if
(
s
->
s_arc
==
NULL
)
Py_FatalError
(
"no mem to resize arc list in addarc"
);
a
=
&
s
->
s_arc
[
s
->
s_narcs
++
];
a
->
a_lbl
=
lbl
;
a
->
a_arrow
=
to
;
}
int
addlabel
(
labellist
*
ll
,
int
type
,
char
*
str
)
{
int
i
;
label
*
lb
;
for
(
i
=
0
;
i
<
ll
->
ll_nlabels
;
i
++
) {
if
(
ll
->
ll_label
[
i
].
lb_type
==
type
&&
strcmp
(
ll
->
ll_label
[
i
].
lb_str
,
str
)
==
0
)
return
i
;
}
ll
->
ll_label
=
(
label
*
)
PyObject_REALLOC
(
ll
->
ll_label
,
sizeof
(
label
)
*
(
ll
->
ll_nlabels
+
1
));
if
(
ll
->
ll_label
==
NULL
)
Py_FatalError
(
"no mem to resize labellist in addlabel"
);
lb
=
&
ll
->
ll_label
[
ll
->
ll_nlabels
++
];
lb
->
lb_type
=
type
;
lb
->
lb_str
=
strdup
(
str
);
if
(
Py_DebugFlag
)
printf
(
"Label @ %8p, %d: %s\n"
,
ll
,
ll
->
ll_nlabels
,
PyGrammar_LabelRepr
(
lb
));
return
lb
-
ll
->
ll_label
;
}
/* Same, but rather dies than adds */
int
findlabel
(
labellist
*
ll
,
int
type
,
char
*
str
)
{
int
i
;
for
(
i
=
0
;
i
<
ll
->
ll_nlabels
;
i
++
) {
if
(
ll
->
ll_label
[
i
].
lb_type
==
type
/*&&
strcmp(ll->ll_label[i].lb_str, str) == 0*/
)
return
i
;
}
fprintf
(
stderr
,
"Label %d/'%s' not found\n"
,
type
,
str
);
Py_FatalError
(
"grammar.c:findlabel()"
);
return
0
;
/* Make gcc -Wall happy */
}
/* Forward */
static
void
translabel
(
grammar
*
,
label
*
);
void
translatelabels
(
grammar
*
g
)
{
int
i
;
#ifdef
Py_DEBUG
printf
(
"Translating labels ...\n"
);
#endif
/* Don't translate EMPTY */
for
(
i
=
EMPTY
+
1
;
i
<
g
->
g_ll
.
ll_nlabels
;
i
++
)
translabel
(
g
,
&
g
->
g_ll
.
ll_label
[
i
]);
}
static
void
translabel
(
grammar
*
g
,
label
*
lb
)
{
int
i
;
if
(
Py_DebugFlag
)
printf
(
"Translating label %s ...\n"
,
PyGrammar_LabelRepr
(
lb
));
if
(
lb
->
lb_type
==
NAME
) {
for
(
i
=
0
;
i
<
g
->
g_ndfas
;
i
++
) {
if
(
strcmp
(
lb
->
lb_str
,
g
->
g_dfa
[
i
].
d_name
)
==
0
) {
if
(
Py_DebugFlag
)
printf
(
"Label %s is non-terminal %d.\n"
,
lb
->
lb_str
,
g
->
g_dfa
[
i
].
d_type
);
lb
->
lb_type
=
g
->
g_dfa
[
i
].
d_type
;
free
(
lb
->
lb_str
);
lb
->
lb_str
=
NULL
;
return
;
}
}
for
(
i
=
0
;
i
<
(
int
)
N_TOKENS
;
i
++
) {
if
(
strcmp
(
lb
->
lb_str
,
_PyParser_TokenNames
[
i
])
==
0
) {
if
(
Py_DebugFlag
)
printf
(
"Label %s is terminal %d.\n"
,
lb
->
lb_str
,
i
);
lb
->
lb_type
=
i
;
free
(
lb
->
lb_str
);
lb
->
lb_str
=
NULL
;
return
;
}
}
printf
(
"Can't translate NAME label '%s'\n"
,
lb
->
lb_str
);
return
;
}
if
(
lb
->
lb_type
==
STRING
) {
if
(
isalpha
(
Py_CHARMASK
(
lb
->
lb_str
[
1
]))
||
lb
->
lb_str
[
1
]
==
'_'
) {
char
*
p
;
char
*
src
;
char
*
dest
;
size_t
name_len
;
if
(
Py_DebugFlag
)
printf
(
"Label %s is a keyword\n"
,
lb
->
lb_str
);
lb
->
lb_type
=
NAME
;
src
=
lb
->
lb_str
+
1
;
p
=
strchr
(
src
,
'\''
);
if
(
p
)
name_len
=
p
-
src
;
else
name_len
=
strlen
(
src
);
dest
=
(
char
*
)
malloc
(
name_len
+
1
);
if
(!
dest
) {
printf
(
"Can't alloc dest '%s'\n"
,
src
);
return
;
}
strncpy
(
dest
,
src
,
name_len
);
dest
[
name_len
]
=
'\0'
;
free
(
lb
->
lb_str
);
lb
->
lb_str
=
dest
;
}
else
if
(
lb
->
lb_str
[
2
]
==
lb
->
lb_str
[
0
]) {
int
type
=
(
int
)
PyToken_OneChar
(
lb
->
lb_str
[
1
]);
if
(
type
!=
OP
) {
lb
->
lb_type
=
type
;
free
(
lb
->
lb_str
);
lb
->
lb_str
=
NULL
;
}
else
printf
(
"Unknown OP label %s\n"
,
lb
->
lb_str
);
}
else
if
(
lb
->
lb_str
[
2
]
&&
lb
->
lb_str
[
3
]
==
lb
->
lb_str
[
0
]) {
int
type
=
(
int
)
PyToken_TwoChars
(
lb
->
lb_str
[
1
],
lb
->
lb_str
[
2
]);
if
(
type
!=
OP
) {
lb
->
lb_type
=
type
;
free
(
lb
->
lb_str
);
lb
->
lb_str
=
NULL
;
}
else
printf
(
"Unknown OP label %s\n"
,
lb
->
lb_str
);
}
else
if
(
lb
->
lb_str
[
2
]
&&
lb
->
lb_str
[
3
]
&&
lb
->
lb_str
[
4
]
==
lb
->
lb_str
[
0
]) {
int
type
=
(
int
)
PyToken_ThreeChars
(
lb
->
lb_str
[
1
],
lb
->
lb_str
[
2
],
lb
->
lb_str
[
3
]);
if
(
type
!=
OP
) {
lb
->
lb_type
=
type
;
free
(
lb
->
lb_str
);
lb
->
lb_str
=
NULL
;
}
else
printf
(
"Unknown OP label %s\n"
,
lb
->
lb_str
);
}
else
printf
(
"Can't translate STRING label %s\n"
,
lb
->
lb_str
);
}
else
printf
(
"Can't translate label '%s'\n"
,
PyGrammar_LabelRepr
(
lb
));
}
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