int
_Py_DisplaySourceLine(PyObject *f, PyObject *filename, int lineno, int indent)
{
int err = 0;
int fd;
int i;
char *found_encoding;
char *encoding;
PyObject *io;
PyObject *binary;
PyObject *fob = NULL;
PyObject *lineobj = NULL;
PyObject *res;
char buf[MAXPATHLEN+1];
int kind;
void *data;
/* open the file */
if (filename == NULL)
return 0;
io = PyImport_ImportModuleNoBlock("io");
if (io == NULL)
return -1;
binary = _PyObject_CallMethodId(io, &PyId_open, "Os", filename, "rb");
if (binary == NULL) {
PyErr_Clear();
binary = _Py_FindSourceFile(filename, buf, sizeof(buf), io);
if (binary == NULL) {
Py_DECREF(io);
return -1;
}
}
/* use the right encoding to decode the file as unicode */
fd = PyObject_AsFileDescriptor(binary);
if (fd < 0) {
Py_DECREF(io);
Py_DECREF(binary);
return 0;
}
found_encoding = PyTokenizer_FindEncodingFilename(fd, filename);
if (found_encoding == NULL)
PyErr_Clear();
encoding = (found_encoding != NULL) ? found_encoding : "utf-8";
/* Reset position */
if (lseek(fd, 0, SEEK_SET) == (off_t)-1) {
Py_DECREF(io);
Py_DECREF(binary);
PyMem_FREE(found_encoding);
return 0;
}
fob = _PyObject_CallMethodId(io, &PyId_TextIOWrapper, "Os", binary, encoding);
Py_DECREF(io);
Py_DECREF(binary);
PyMem_FREE(found_encoding);
if (fob == NULL) {
PyErr_Clear();
return 0;
}
/* get the line number lineno */
for (i = 0; i < lineno; i++) {
Py_XDECREF(lineobj);
lineobj = PyFile_GetLine(fob, -1);
if (!lineobj) {
err = -1;
break;
}
}
res = _PyObject_CallMethodId(fob, &PyId_close, "");
if (res)
Py_DECREF(res);
else
PyErr_Clear();
Py_DECREF(fob);
if (!lineobj || !PyUnicode_Check(lineobj)) {
Py_XDECREF(lineobj);
return err;
}
/* remove the indentation of the line */
kind = PyUnicode_KIND(lineobj);
data = PyUnicode_DATA(lineobj);
for (i=0; i < PyUnicode_GET_LENGTH(lineobj); i++) {
Py_UCS4 ch = PyUnicode_READ(kind, data, i);
if (ch != ' ' && ch != '\t' && ch != '\014')
break;
}
if (i) {
PyObject *truncated;
truncated = PyUnicode_Substring(lineobj, i, PyUnicode_GET_LENGTH(lineobj));
if (truncated) {
Py_DECREF(lineobj);
lineobj = truncated;
} else {
PyErr_Clear();
}
}
/* Write some spaces before the line */
strcpy(buf, " ");
assert (strlen(buf) == 10);
while (indent > 0) {
if (indent < 10)
buf[indent] = '\0';
err = PyFile_WriteString(buf, f);
if (err != 0)
break;
indent -= 10;
}
/* finally display the line */
if (err == 0)
err = PyFile_WriteObject(lineobj, f, Py_PRINT_RAW);
Py_DECREF(lineobj);
if (err == 0)
err = PyFile_WriteString("\n", f);
return err;
}
char *
PyTokenizer_FindEncoding(int fd)
{
return PyTokenizer_FindEncodingFilename(fd, NULL);
}
