static int
parser_compare_nodes(node *left, node *right)
{
int j;
if (TYPE(left) < TYPE(right))
return (-1);
if (TYPE(right) < TYPE(left))
return (1);
if (ISTERMINAL(TYPE(left)))
return (strcmp(STR(left), STR(right)));
if (NCH(left) < NCH(right))
return (-1);
if (NCH(right) < NCH(left))
return (1);
for (j = 0; j < NCH(left); ++j) {
int v = parser_compare_nodes(CHILD(left, j), CHILD(right, j));
if (v != 0)
return (v);
}
return (0);
}
static void
list1node(FILE *fp, node *n)
{
if (n == NULL)
return;
if (ISNONTERMINAL(TYPE(n))) {
int i;
for (i = 0; i < NCH(n); i++)
list1node(fp, CHILD(n, i));
}
else if (ISTERMINAL(TYPE(n))) {
switch (TYPE(n)) {
case INDENT:
++level;
break;
case DEDENT:
--level;
break;
default:
if (atbol) {
int i;
for (i = 0; i < level; ++i)
fprintf(fp, "\t");
atbol = 0;
}
if (TYPE(n) == NEWLINE) {
if (STR(n) != NULL)
fprintf(fp, "%s", STR(n));
fprintf(fp, "\n");
atbol = 1;
}
else
fprintf(fp, "%s ", STR(n));
break;
}
}
else
fprintf(fp, "? ");
}
static void
calcfirstset(grammar *g, dfa *d)
{
int i, j;
state *s;
arc *a;
int nsyms;
int *sym;
int nbits;
static bitset dummy;
bitset result;
int type;
dfa *d1;
label *l0;
if (Py_DebugFlag)
printf("Calculate FIRST set for '%s'\n", d->d_name);
if (dummy == NULL)
dummy = newbitset(1);
if (d->d_first == dummy) {
fprintf(stderr, "Left-recursion for '%s'\n", d->d_name);
return;
}
if (d->d_first != NULL) {
fprintf(stderr, "Re-calculating FIRST set for '%s' ???\n",
d->d_name);
}
d->d_first = dummy;
l0 = g->g_ll.ll_label;
nbits = g->g_ll.ll_nlabels;
result = newbitset(nbits);
sym = (int *)PyObject_MALLOC(sizeof(int));
if (sym == NULL)
Py_FatalError("no mem for new sym in calcfirstset");
nsyms = 1;
sym[0] = findlabel(&g->g_ll, d->d_type, (char *)NULL);
s = &d->d_state[d->d_initial];
for (i = 0; i < s->s_narcs; i++) {
a = &s->s_arc[i];
for (j = 0; j < nsyms; j++) {
if (sym[j] == a->a_lbl)
break;
}
if (j >= nsyms) { /* New label */
sym = (int *)PyObject_REALLOC(sym,
sizeof(int) * (nsyms + 1));
if (sym == NULL)
Py_FatalError(
"no mem to resize sym in calcfirstset");
sym[nsyms++] = a->a_lbl;
type = l0[a->a_lbl].lb_type;
if (ISNONTERMINAL(type)) {
d1 = PyGrammar_FindDFA(g, type);
if (d1->d_first == dummy) {
fprintf(stderr,
"Left-recursion below '%s'\n",
d->d_name);
}
else {
if (d1->d_first == NULL)
calcfirstset(g, d1);
mergebitset(result,
d1->d_first, nbits);
}
}
else if (ISTERMINAL(type)) {
addbit(result, a->a_lbl);
}
}
}
d->d_first = result;
if (Py_DebugFlag) {
printf("FIRST set for '%s': {", d->d_name);
for (i = 0; i < nbits; i++) {
if (testbit(result, i))
printf(" %s", PyGrammar_LabelRepr(&l0[i]));
}
printf(" }\n");
}
PyObject_FREE(sym);
}
static PyObject*
node2tuple(node *n, /* node to convert */
SeqMaker mkseq, /* create sequence */
SeqInserter addelem, /* func. to add elem. in seq. */
int lineno, /* include line numbers? */
int col_offset) /* include column offsets? */
{
PyObject *result = NULL, *w;
if (n == NULL) {
Py_RETURN_NONE;
}
if (ISNONTERMINAL(TYPE(n))) {
int i;
result = mkseq(1 + NCH(n) + (TYPE(n) == encoding_decl));
if (result == NULL)
goto error;
w = PyLong_FromLong(TYPE(n));
if (w == NULL)
goto error;
(void) addelem(result, 0, w);
for (i = 0; i < NCH(n); i++) {
w = node2tuple(CHILD(n, i), mkseq, addelem, lineno, col_offset);
if (w == NULL)
goto error;
(void) addelem(result, i+1, w);
}
if (TYPE(n) == encoding_decl) {
w = PyUnicode_FromString(STR(n));
if (w == NULL)
goto error;
(void) addelem(result, i+1, w);
}
}
else if (ISTERMINAL(TYPE(n))) {
result = mkseq(2 + lineno + col_offset);
if (result == NULL)
goto error;
w = PyLong_FromLong(TYPE(n));
if (w == NULL)
goto error;
(void) addelem(result, 0, w);
w = PyUnicode_FromString(STR(n));
if (w == NULL)
goto error;
(void) addelem(result, 1, w);
if (lineno) {
w = PyLong_FromLong(n->n_lineno);
if (w == NULL)
goto error;
(void) addelem(result, 2, w);
}
if (col_offset) {
w = PyLong_FromLong(n->n_col_offset);
if (w == NULL)
goto error;
(void) addelem(result, 2 + lineno, w);
}
}
else {
PyErr_SetString(PyExc_SystemError,
"unrecognized parse tree node type");
return ((PyObject*) NULL);
}
return result;
error:
Py_XDECREF(result);
return NULL;
}