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Copy path_csv.c
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1815 lines (1605 loc) · 50.7 KB
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/* csv module */
/*
This module provides the low-level underpinnings of a CSV reading/writing
module. Users should not use this module directly, but import the csv.py
module instead.
*/
#define MODULE_VERSION "1.0"
// clinic/_csv.c.h uses internal pycore_modsupport.h API
#ifndef Py_BUILD_CORE_BUILTIN
# define Py_BUILD_CORE_MODULE 1
#endif
#include "Python.h"
#include <stddef.h> // offsetof()
#include <stdbool.h>
/*[clinic input]
module _csv
[clinic start generated code]*/
/*[clinic end generated code: output=da39a3ee5e6b4b0d input=385118b71aa43706]*/
#include "clinic/_csv.c.h"
#define NOT_SET ((Py_UCS4)-1)
#define EOL ((Py_UCS4)-2)
typedef struct {
PyObject *error_obj; /* CSV exception */
PyObject *dialects; /* Dialect registry */
PyTypeObject *dialect_type;
PyTypeObject *reader_type;
PyTypeObject *writer_type;
long field_limit; /* max parsed field size */
PyObject *str_write;
} _csvstate;
static struct PyModuleDef _csvmodule;
static inline _csvstate*
get_csv_state(PyObject *module)
{
void *state = PyModule_GetState(module);
assert(state != NULL);
return (_csvstate *)state;
}
static int
_csv_clear(PyObject *module)
{
_csvstate *module_state = PyModule_GetState(module);
Py_CLEAR(module_state->error_obj);
Py_CLEAR(module_state->dialects);
Py_CLEAR(module_state->dialect_type);
Py_CLEAR(module_state->reader_type);
Py_CLEAR(module_state->writer_type);
Py_CLEAR(module_state->str_write);
return 0;
}
static int
_csv_traverse(PyObject *module, visitproc visit, void *arg)
{
_csvstate *module_state = PyModule_GetState(module);
Py_VISIT(module_state->error_obj);
Py_VISIT(module_state->dialects);
Py_VISIT(module_state->dialect_type);
Py_VISIT(module_state->reader_type);
Py_VISIT(module_state->writer_type);
return 0;
}
static void
_csv_free(void *module)
{
_csv_clear((PyObject *)module);
}
typedef enum {
START_RECORD, START_FIELD, ESCAPED_CHAR, IN_FIELD,
IN_QUOTED_FIELD, ESCAPE_IN_QUOTED_FIELD, QUOTE_IN_QUOTED_FIELD,
EAT_CRNL,AFTER_ESCAPED_CRNL
} ParserState;
typedef enum {
QUOTE_MINIMAL, QUOTE_ALL, QUOTE_NONNUMERIC, QUOTE_NONE,
QUOTE_STRINGS, QUOTE_NOTNULL
} QuoteStyle;
typedef struct {
QuoteStyle style;
const char *name;
} StyleDesc;
static const StyleDesc quote_styles[] = {
{ QUOTE_MINIMAL, "QUOTE_MINIMAL" },
{ QUOTE_ALL, "QUOTE_ALL" },
{ QUOTE_NONNUMERIC, "QUOTE_NONNUMERIC" },
{ QUOTE_NONE, "QUOTE_NONE" },
{ QUOTE_STRINGS, "QUOTE_STRINGS" },
{ QUOTE_NOTNULL, "QUOTE_NOTNULL" },
{ 0 }
};
typedef struct {
PyObject_HEAD
char doublequote; /* is " represented by ""? */
char skipinitialspace; /* ignore spaces following delimiter? */
char strict; /* raise exception on bad CSV */
int quoting; /* style of quoting to write */
Py_UCS4 delimiter; /* field separator */
Py_UCS4 quotechar; /* quote character */
Py_UCS4 escapechar; /* escape character */
PyObject *lineterminator; /* string to write between records */
} DialectObj;
typedef struct {
PyObject_HEAD
PyObject *input_iter; /* iterate over this for input lines */
DialectObj *dialect; /* parsing dialect */
PyObject *fields; /* field list for current record */
ParserState state; /* current CSV parse state */
Py_UCS4 *field; /* temporary buffer */
Py_ssize_t field_size; /* size of allocated buffer */
Py_ssize_t field_len; /* length of current field */
int numeric_field; /* treat field as numeric */
unsigned long line_num; /* Source-file line number */
} ReaderObj;
typedef struct {
PyObject_HEAD
PyObject *write; /* write output lines to this file */
DialectObj *dialect; /* parsing dialect */
Py_UCS4 *rec; /* buffer for parser.join */
Py_ssize_t rec_size; /* size of allocated record */
Py_ssize_t rec_len; /* length of record */
int num_fields; /* number of fields in record */
PyObject *error_obj; /* cached error object */
} WriterObj;
/*
* DIALECT class
*/
static PyObject *
get_dialect_from_registry(PyObject *name_obj, _csvstate *module_state)
{
PyObject *dialect_obj;
dialect_obj = PyDict_GetItemWithError(module_state->dialects, name_obj);
if (dialect_obj == NULL) {
if (!PyErr_Occurred())
PyErr_Format(module_state->error_obj, "unknown dialect");
}
else
Py_INCREF(dialect_obj);
return dialect_obj;
}
static PyObject *
get_char_or_None(Py_UCS4 c)
{
if (c == NOT_SET) {
Py_RETURN_NONE;
}
else
return PyUnicode_FromOrdinal(c);
}
static PyObject *
Dialect_get_lineterminator(DialectObj *self, void *Py_UNUSED(ignored))
{
return Py_XNewRef(self->lineterminator);
}
static PyObject *
Dialect_get_delimiter(DialectObj *self, void *Py_UNUSED(ignored))
{
return get_char_or_None(self->delimiter);
}
static PyObject *
Dialect_get_escapechar(DialectObj *self, void *Py_UNUSED(ignored))
{
return get_char_or_None(self->escapechar);
}
static PyObject *
Dialect_get_quotechar(DialectObj *self, void *Py_UNUSED(ignored))
{
return get_char_or_None(self->quotechar);
}
static PyObject *
Dialect_get_quoting(DialectObj *self, void *Py_UNUSED(ignored))
{
return PyLong_FromLong(self->quoting);
}
static int
_set_bool(const char *name, char *target, PyObject *src, bool dflt)
{
if (src == NULL)
*target = dflt;
else {
int b = PyObject_IsTrue(src);
if (b < 0)
return -1;
*target = (char)b;
}
return 0;
}
static int
_set_int(const char *name, int *target, PyObject *src, int dflt)
{
if (src == NULL)
*target = dflt;
else {
int value;
if (!PyLong_CheckExact(src)) {
PyErr_Format(PyExc_TypeError,
"\"%s\" must be an integer", name);
return -1;
}
value = PyLong_AsInt(src);
if (value == -1 && PyErr_Occurred()) {
return -1;
}
*target = value;
}
return 0;
}
static int
_set_char_or_none(const char *name, Py_UCS4 *target, PyObject *src, Py_UCS4 dflt)
{
if (src == NULL) {
*target = dflt;
}
else {
*target = NOT_SET;
if (src != Py_None) {
if (!PyUnicode_Check(src)) {
PyErr_Format(PyExc_TypeError,
"\"%s\" must be string or None, not %.200s", name,
Py_TYPE(src)->tp_name);
return -1;
}
Py_ssize_t len = PyUnicode_GetLength(src);
if (len < 0) {
return -1;
}
if (len != 1) {
PyErr_Format(PyExc_TypeError,
"\"%s\" must be a 1-character string",
name);
return -1;
}
*target = PyUnicode_READ_CHAR(src, 0);
}
}
return 0;
}
static int
_set_char(const char *name, Py_UCS4 *target, PyObject *src, Py_UCS4 dflt)
{
if (src == NULL) {
*target = dflt;
}
else {
if (!PyUnicode_Check(src)) {
PyErr_Format(PyExc_TypeError,
"\"%s\" must be string, not %.200s", name,
Py_TYPE(src)->tp_name);
return -1;
}
Py_ssize_t len = PyUnicode_GetLength(src);
if (len < 0) {
return -1;
}
if (len != 1) {
PyErr_Format(PyExc_TypeError,
"\"%s\" must be a 1-character string",
name);
return -1;
}
*target = PyUnicode_READ_CHAR(src, 0);
}
return 0;
}
static int
_set_str(const char *name, PyObject **target, PyObject *src, const char *dflt)
{
if (src == NULL)
*target = PyUnicode_DecodeASCII(dflt, strlen(dflt), NULL);
else {
if (src == Py_None)
*target = NULL;
else if (!PyUnicode_Check(src)) {
PyErr_Format(PyExc_TypeError,
"\"%s\" must be a string", name);
return -1;
}
else {
Py_XSETREF(*target, Py_NewRef(src));
}
}
return 0;
}
static int
dialect_check_quoting(int quoting)
{
const StyleDesc *qs;
for (qs = quote_styles; qs->name; qs++) {
if ((int)qs->style == quoting)
return 0;
}
PyErr_Format(PyExc_TypeError, "bad \"quoting\" value");
return -1;
}
#define D_OFF(x) offsetof(DialectObj, x)
static struct PyMemberDef Dialect_memberlist[] = {
{ "skipinitialspace", Py_T_BOOL, D_OFF(skipinitialspace), Py_READONLY },
{ "doublequote", Py_T_BOOL, D_OFF(doublequote), Py_READONLY },
{ "strict", Py_T_BOOL, D_OFF(strict), Py_READONLY },
{ NULL }
};
static PyGetSetDef Dialect_getsetlist[] = {
{ "delimiter", (getter)Dialect_get_delimiter},
{ "escapechar", (getter)Dialect_get_escapechar},
{ "lineterminator", (getter)Dialect_get_lineterminator},
{ "quotechar", (getter)Dialect_get_quotechar},
{ "quoting", (getter)Dialect_get_quoting},
{NULL},
};
static void
Dialect_dealloc(DialectObj *self)
{
PyTypeObject *tp = Py_TYPE(self);
PyObject_GC_UnTrack(self);
tp->tp_clear((PyObject *)self);
PyObject_GC_Del(self);
Py_DECREF(tp);
}
static char *dialect_kws[] = {
"dialect",
"delimiter",
"doublequote",
"escapechar",
"lineterminator",
"quotechar",
"quoting",
"skipinitialspace",
"strict",
NULL
};
static _csvstate *
_csv_state_from_type(PyTypeObject *type, const char *name)
{
PyObject *module = PyType_GetModuleByDef(type, &_csvmodule);
if (module == NULL) {
return NULL;
}
_csvstate *module_state = PyModule_GetState(module);
if (module_state == NULL) {
PyErr_Format(PyExc_SystemError,
"%s: No _csv module state found", name);
return NULL;
}
return module_state;
}
static PyObject *
dialect_new(PyTypeObject *type, PyObject *args, PyObject *kwargs)
{
DialectObj *self;
PyObject *ret = NULL;
PyObject *dialect = NULL;
PyObject *delimiter = NULL;
PyObject *doublequote = NULL;
PyObject *escapechar = NULL;
PyObject *lineterminator = NULL;
PyObject *quotechar = NULL;
PyObject *quoting = NULL;
PyObject *skipinitialspace = NULL;
PyObject *strict = NULL;
if (!PyArg_ParseTupleAndKeywords(args, kwargs,
"|OOOOOOOOO", dialect_kws,
&dialect,
&delimiter,
&doublequote,
&escapechar,
&lineterminator,
"echar,
"ing,
&skipinitialspace,
&strict))
return NULL;
_csvstate *module_state = _csv_state_from_type(type, "dialect_new");
if (module_state == NULL) {
return NULL;
}
if (dialect != NULL) {
if (PyUnicode_Check(dialect)) {
dialect = get_dialect_from_registry(dialect, module_state);
if (dialect == NULL)
return NULL;
}
else
Py_INCREF(dialect);
/* Can we reuse this instance? */
if (PyObject_TypeCheck(dialect, module_state->dialect_type) &&
delimiter == NULL &&
doublequote == NULL &&
escapechar == NULL &&
lineterminator == NULL &&
quotechar == NULL &&
quoting == NULL &&
skipinitialspace == NULL &&
strict == NULL)
return dialect;
}
self = (DialectObj *)type->tp_alloc(type, 0);
if (self == NULL) {
Py_CLEAR(dialect);
return NULL;
}
self->lineterminator = NULL;
Py_XINCREF(delimiter);
Py_XINCREF(doublequote);
Py_XINCREF(escapechar);
Py_XINCREF(lineterminator);
Py_XINCREF(quotechar);
Py_XINCREF(quoting);
Py_XINCREF(skipinitialspace);
Py_XINCREF(strict);
if (dialect != NULL) {
#define DIALECT_GETATTR(v, n) \
do { \
if (v == NULL) { \
v = PyObject_GetAttrString(dialect, n); \
if (v == NULL) \
PyErr_Clear(); \
} \
} while (0)
DIALECT_GETATTR(delimiter, "delimiter");
DIALECT_GETATTR(doublequote, "doublequote");
DIALECT_GETATTR(escapechar, "escapechar");
DIALECT_GETATTR(lineterminator, "lineterminator");
DIALECT_GETATTR(quotechar, "quotechar");
DIALECT_GETATTR(quoting, "quoting");
DIALECT_GETATTR(skipinitialspace, "skipinitialspace");
DIALECT_GETATTR(strict, "strict");
}
/* check types and convert to C values */
#define DIASET(meth, name, target, src, dflt) \
if (meth(name, target, src, dflt)) \
goto err
DIASET(_set_char, "delimiter", &self->delimiter, delimiter, ',');
DIASET(_set_bool, "doublequote", &self->doublequote, doublequote, true);
DIASET(_set_char_or_none, "escapechar", &self->escapechar, escapechar, NOT_SET);
DIASET(_set_str, "lineterminator", &self->lineterminator, lineterminator, "\r\n");
DIASET(_set_char_or_none, "quotechar", &self->quotechar, quotechar, '"');
DIASET(_set_int, "quoting", &self->quoting, quoting, QUOTE_MINIMAL);
DIASET(_set_bool, "skipinitialspace", &self->skipinitialspace, skipinitialspace, false);
DIASET(_set_bool, "strict", &self->strict, strict, false);
/* validate options */
if (dialect_check_quoting(self->quoting))
goto err;
if (self->delimiter == NOT_SET) {
PyErr_SetString(PyExc_TypeError,
"\"delimiter\" must be a 1-character string");
goto err;
}
if (quotechar == Py_None && quoting == NULL)
self->quoting = QUOTE_NONE;
if (self->quoting != QUOTE_NONE && self->quotechar == NOT_SET) {
PyErr_SetString(PyExc_TypeError,
"quotechar must be set if quoting enabled");
goto err;
}
if (self->lineterminator == NULL) {
PyErr_SetString(PyExc_TypeError, "lineterminator must be set");
goto err;
}
ret = Py_NewRef(self);
err:
Py_CLEAR(self);
Py_CLEAR(dialect);
Py_CLEAR(delimiter);
Py_CLEAR(doublequote);
Py_CLEAR(escapechar);
Py_CLEAR(lineterminator);
Py_CLEAR(quotechar);
Py_CLEAR(quoting);
Py_CLEAR(skipinitialspace);
Py_CLEAR(strict);
return ret;
}
/* Since dialect is now a heap type, it inherits pickling method for
* protocol 0 and 1 from object, therefore it needs to be overridden */
PyDoc_STRVAR(dialect_reduce_doc, "raises an exception to avoid pickling");
static PyObject *
Dialect_reduce(PyObject *self, PyObject *args) {
PyErr_Format(PyExc_TypeError,
"cannot pickle '%.100s' instances", _PyType_Name(Py_TYPE(self)));
return NULL;
}
static struct PyMethodDef dialect_methods[] = {
{"__reduce__", Dialect_reduce, METH_VARARGS, dialect_reduce_doc},
{"__reduce_ex__", Dialect_reduce, METH_VARARGS, dialect_reduce_doc},
{NULL, NULL}
};
PyDoc_STRVAR(Dialect_Type_doc,
"CSV dialect\n"
"\n"
"The Dialect type records CSV parsing and generation options.\n");
static int
Dialect_clear(DialectObj *self)
{
Py_CLEAR(self->lineterminator);
return 0;
}
static int
Dialect_traverse(DialectObj *self, visitproc visit, void *arg)
{
Py_VISIT(self->lineterminator);
Py_VISIT(Py_TYPE(self));
return 0;
}
static PyType_Slot Dialect_Type_slots[] = {
{Py_tp_doc, (char*)Dialect_Type_doc},
{Py_tp_members, Dialect_memberlist},
{Py_tp_getset, Dialect_getsetlist},
{Py_tp_new, dialect_new},
{Py_tp_methods, dialect_methods},
{Py_tp_dealloc, Dialect_dealloc},
{Py_tp_clear, Dialect_clear},
{Py_tp_traverse, Dialect_traverse},
{0, NULL}
};
PyType_Spec Dialect_Type_spec = {
.name = "_csv.Dialect",
.basicsize = sizeof(DialectObj),
.flags = (Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE | Py_TPFLAGS_HAVE_GC |
Py_TPFLAGS_IMMUTABLETYPE),
.slots = Dialect_Type_slots,
};
/*
* Return an instance of the dialect type, given a Python instance or kwarg
* description of the dialect
*/
static PyObject *
_call_dialect(_csvstate *module_state, PyObject *dialect_inst, PyObject *kwargs)
{
PyObject *type = (PyObject *)module_state->dialect_type;
if (dialect_inst) {
return PyObject_VectorcallDict(type, &dialect_inst, 1, kwargs);
}
else {
return PyObject_VectorcallDict(type, NULL, 0, kwargs);
}
}
/*
* READER
*/
static int
parse_save_field(ReaderObj *self)
{
PyObject *field;
field = PyUnicode_FromKindAndData(PyUnicode_4BYTE_KIND,
(void *) self->field, self->field_len);
if (field == NULL)
return -1;
self->field_len = 0;
if (self->numeric_field) {
PyObject *tmp;
self->numeric_field = 0;
tmp = PyNumber_Float(field);
Py_DECREF(field);
if (tmp == NULL)
return -1;
field = tmp;
}
if (PyList_Append(self->fields, field) < 0) {
Py_DECREF(field);
return -1;
}
Py_DECREF(field);
return 0;
}
static int
parse_grow_buff(ReaderObj *self)
{
assert((size_t)self->field_size <= PY_SSIZE_T_MAX / sizeof(Py_UCS4));
Py_ssize_t field_size_new = self->field_size ? 2 * self->field_size : 4096;
Py_UCS4 *field_new = self->field;
PyMem_Resize(field_new, Py_UCS4, field_size_new);
if (field_new == NULL) {
PyErr_NoMemory();
return 0;
}
self->field = field_new;
self->field_size = field_size_new;
return 1;
}
static int
parse_add_char(ReaderObj *self, _csvstate *module_state, Py_UCS4 c)
{
if (self->field_len >= module_state->field_limit) {
PyErr_Format(module_state->error_obj,
"field larger than field limit (%ld)",
module_state->field_limit);
return -1;
}
if (self->field_len == self->field_size && !parse_grow_buff(self))
return -1;
self->field[self->field_len++] = c;
return 0;
}
static int
parse_process_char(ReaderObj *self, _csvstate *module_state, Py_UCS4 c)
{
DialectObj *dialect = self->dialect;
switch (self->state) {
case START_RECORD:
/* start of record */
if (c == EOL)
/* empty line - return [] */
break;
else if (c == '\n' || c == '\r') {
self->state = EAT_CRNL;
break;
}
/* normal character - handle as START_FIELD */
self->state = START_FIELD;
/* fallthru */
case START_FIELD:
/* expecting field */
if (c == '\n' || c == '\r' || c == EOL) {
/* save empty field - return [fields] */
if (parse_save_field(self) < 0)
return -1;
self->state = (c == EOL ? START_RECORD : EAT_CRNL);
}
else if (c == dialect->quotechar &&
dialect->quoting != QUOTE_NONE) {
/* start quoted field */
self->state = IN_QUOTED_FIELD;
}
else if (c == dialect->escapechar) {
/* possible escaped character */
self->state = ESCAPED_CHAR;
}
else if (c == ' ' && dialect->skipinitialspace)
/* ignore spaces at start of field */
;
else if (c == dialect->delimiter) {
/* save empty field */
if (parse_save_field(self) < 0)
return -1;
}
else {
/* begin new unquoted field */
if (dialect->quoting == QUOTE_NONNUMERIC)
self->numeric_field = 1;
if (parse_add_char(self, module_state, c) < 0)
return -1;
self->state = IN_FIELD;
}
break;
case ESCAPED_CHAR:
if (c == '\n' || c=='\r') {
if (parse_add_char(self, module_state, c) < 0)
return -1;
self->state = AFTER_ESCAPED_CRNL;
break;
}
if (c == EOL)
c = '\n';
if (parse_add_char(self, module_state, c) < 0)
return -1;
self->state = IN_FIELD;
break;
case AFTER_ESCAPED_CRNL:
if (c == EOL)
break;
/*fallthru*/
case IN_FIELD:
/* in unquoted field */
if (c == '\n' || c == '\r' || c == EOL) {
/* end of line - return [fields] */
if (parse_save_field(self) < 0)
return -1;
self->state = (c == EOL ? START_RECORD : EAT_CRNL);
}
else if (c == dialect->escapechar) {
/* possible escaped character */
self->state = ESCAPED_CHAR;
}
else if (c == dialect->delimiter) {
/* save field - wait for new field */
if (parse_save_field(self) < 0)
return -1;
self->state = START_FIELD;
}
else {
/* normal character - save in field */
if (parse_add_char(self, module_state, c) < 0)
return -1;
}
break;
case IN_QUOTED_FIELD:
/* in quoted field */
if (c == EOL)
;
else if (c == dialect->escapechar) {
/* Possible escape character */
self->state = ESCAPE_IN_QUOTED_FIELD;
}
else if (c == dialect->quotechar &&
dialect->quoting != QUOTE_NONE) {
if (dialect->doublequote) {
/* doublequote; " represented by "" */
self->state = QUOTE_IN_QUOTED_FIELD;
}
else {
/* end of quote part of field */
self->state = IN_FIELD;
}
}
else {
/* normal character - save in field */
if (parse_add_char(self, module_state, c) < 0)
return -1;
}
break;
case ESCAPE_IN_QUOTED_FIELD:
if (c == EOL)
c = '\n';
if (parse_add_char(self, module_state, c) < 0)
return -1;
self->state = IN_QUOTED_FIELD;
break;
case QUOTE_IN_QUOTED_FIELD:
/* doublequote - seen a quote in a quoted field */
if (dialect->quoting != QUOTE_NONE &&
c == dialect->quotechar) {
/* save "" as " */
if (parse_add_char(self, module_state, c) < 0)
return -1;
self->state = IN_QUOTED_FIELD;
}
else if (c == dialect->delimiter) {
/* save field - wait for new field */
if (parse_save_field(self) < 0)
return -1;
self->state = START_FIELD;
}
else if (c == '\n' || c == '\r' || c == EOL) {
/* end of line - return [fields] */
if (parse_save_field(self) < 0)
return -1;
self->state = (c == EOL ? START_RECORD : EAT_CRNL);
}
else if (!dialect->strict) {
if (parse_add_char(self, module_state, c) < 0)
return -1;
self->state = IN_FIELD;
}
else {
/* illegal */
PyErr_Format(module_state->error_obj, "'%c' expected after '%c'",
dialect->delimiter,
dialect->quotechar);
return -1;
}
break;
case EAT_CRNL:
if (c == '\n' || c == '\r')
;
else if (c == EOL)
self->state = START_RECORD;
else {
PyErr_Format(module_state->error_obj,
"new-line character seen in unquoted field - do you need to open the file in universal-newline mode?");
return -1;
}
break;
}
return 0;
}
static int
parse_reset(ReaderObj *self)
{
Py_XSETREF(self->fields, PyList_New(0));
if (self->fields == NULL)
return -1;
self->field_len = 0;
self->state = START_RECORD;
self->numeric_field = 0;
return 0;
}
static PyObject *
Reader_iternext(ReaderObj *self)
{
PyObject *fields = NULL;
Py_UCS4 c;
Py_ssize_t pos, linelen;
int kind;
const void *data;
PyObject *lineobj;
_csvstate *module_state = _csv_state_from_type(Py_TYPE(self),
"Reader.__next__");
if (module_state == NULL) {
return NULL;
}
if (parse_reset(self) < 0)
return NULL;
do {
lineobj = PyIter_Next(self->input_iter);
if (lineobj == NULL) {
/* End of input OR exception */
if (!PyErr_Occurred() && (self->field_len != 0 ||
self->state == IN_QUOTED_FIELD)) {
if (self->dialect->strict)
PyErr_SetString(module_state->error_obj,
"unexpected end of data");
else if (parse_save_field(self) >= 0)
break;
}
return NULL;
}
if (!PyUnicode_Check(lineobj)) {
PyErr_Format(module_state->error_obj,
"iterator should return strings, "
"not %.200s "
"(the file should be opened in text mode)",
Py_TYPE(lineobj)->tp_name
);
Py_DECREF(lineobj);
return NULL;
}
++self->line_num;
kind = PyUnicode_KIND(lineobj);
data = PyUnicode_DATA(lineobj);
pos = 0;
linelen = PyUnicode_GET_LENGTH(lineobj);
while (linelen--) {
c = PyUnicode_READ(kind, data, pos);
if (parse_process_char(self, module_state, c) < 0) {
Py_DECREF(lineobj);
goto err;
}
pos++;
}
Py_DECREF(lineobj);
if (parse_process_char(self, module_state, EOL) < 0)
goto err;
} while (self->state != START_RECORD);
fields = self->fields;
self->fields = NULL;
err:
return fields;
}
static void
Reader_dealloc(ReaderObj *self)
{
PyTypeObject *tp = Py_TYPE(self);
PyObject_GC_UnTrack(self);
tp->tp_clear((PyObject *)self);
if (self->field != NULL) {
PyMem_Free(self->field);
self->field = NULL;
}
PyObject_GC_Del(self);
Py_DECREF(tp);
}
static int
Reader_traverse(ReaderObj *self, visitproc visit, void *arg)
{
Py_VISIT(self->dialect);
Py_VISIT(self->input_iter);
Py_VISIT(self->fields);
Py_VISIT(Py_TYPE(self));
return 0;
}
static int
Reader_clear(ReaderObj *self)
{
Py_CLEAR(self->dialect);
Py_CLEAR(self->input_iter);
Py_CLEAR(self->fields);
return 0;
}
PyDoc_STRVAR(Reader_Type_doc,
"CSV reader\n"
"\n"
"Reader objects are responsible for reading and parsing tabular data\n"
"in CSV format.\n"
);
static struct PyMethodDef Reader_methods[] = {
{ NULL, NULL }
};
#define R_OFF(x) offsetof(ReaderObj, x)
static struct PyMemberDef Reader_memberlist[] = {
{ "dialect", _Py_T_OBJECT, R_OFF(dialect), Py_READONLY },
{ "line_num", Py_T_ULONG, R_OFF(line_num), Py_READONLY },
{ NULL }
};
static PyType_Slot Reader_Type_slots[] = {
{Py_tp_doc, (char*)Reader_Type_doc},
{Py_tp_traverse, Reader_traverse},
{Py_tp_iter, PyObject_SelfIter},
{Py_tp_iternext, Reader_iternext},
{Py_tp_methods, Reader_methods},
{Py_tp_members, Reader_memberlist},
{Py_tp_clear, Reader_clear},
{Py_tp_dealloc, Reader_dealloc},
{0, NULL}
};
PyType_Spec Reader_Type_spec = {
.name = "_csv.reader",
.basicsize = sizeof(ReaderObj),
.flags = (Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE | Py_TPFLAGS_HAVE_GC |