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1617 lines (1443 loc) · 47.3 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"
#include "Python.h"
#include "structmember.h"
#define IS_BASESTRING(o) \
PyUnicode_Check(o)
static PyObject *error_obj; /* CSV exception */
static PyObject *dialects; /* Dialect registry */
static long field_limit = 128 * 1024; /* max parsed field size */
typedef enum {
START_RECORD, START_FIELD, ESCAPED_CHAR, IN_FIELD,
IN_QUOTED_FIELD, ESCAPE_IN_QUOTED_FIELD, QUOTE_IN_QUOTED_FIELD,
EAT_CRNL
} ParserState;
typedef enum {
QUOTE_MINIMAL, QUOTE_ALL, QUOTE_NONNUMERIC, QUOTE_NONE
} QuoteStyle;
typedef struct {
QuoteStyle style;
char *name;
} StyleDesc;
static StyleDesc quote_styles[] = {
{ QUOTE_MINIMAL, "QUOTE_MINIMAL" },
{ QUOTE_ALL, "QUOTE_ALL" },
{ QUOTE_NONNUMERIC, "QUOTE_NONNUMERIC" },
{ QUOTE_NONE, "QUOTE_NONE" },
{ 0 }
};
typedef struct {
PyObject_HEAD
int doublequote; /* is " represented by ""? */
Py_UCS4 delimiter; /* field separator */
Py_UCS4 quotechar; /* quote character */
Py_UCS4 escapechar; /* escape character */
int skipinitialspace; /* ignore spaces following delimiter? */
PyObject *lineterminator; /* string to write between records */
int quoting; /* style of quoting to write */
int strict; /* raise exception on bad CSV */
} DialectObj;
static PyTypeObject Dialect_Type;
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;
static PyTypeObject Reader_Type;
#define ReaderObject_Check(v) (Py_TYPE(v) == &Reader_Type)
typedef struct {
PyObject_HEAD
PyObject *writeline; /* 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 */
} WriterObj;
static PyTypeObject Writer_Type;
/*
* DIALECT class
*/
static PyObject *
get_dialect_from_registry(PyObject * name_obj)
{
PyObject *dialect_obj;
dialect_obj = PyDict_GetItem(dialects, name_obj);
if (dialect_obj == NULL) {
if (!PyErr_Occurred())
PyErr_Format(error_obj, "unknown dialect");
}
else
Py_INCREF(dialect_obj);
return dialect_obj;
}
static PyObject *
get_string(PyObject *str)
{
Py_XINCREF(str);
return str;
}
static PyObject *
get_nullchar_as_None(Py_UCS4 c)
{
if (c == '\0') {
Py_INCREF(Py_None);
return Py_None;
}
else
return PyUnicode_FromOrdinal(c);
}
static PyObject *
Dialect_get_lineterminator(DialectObj *self)
{
return get_string(self->lineterminator);
}
static PyObject *
Dialect_get_delimiter(DialectObj *self)
{
return get_nullchar_as_None(self->delimiter);
}
static PyObject *
Dialect_get_escapechar(DialectObj *self)
{
return get_nullchar_as_None(self->escapechar);
}
static PyObject *
Dialect_get_quotechar(DialectObj *self)
{
return get_nullchar_as_None(self->quotechar);
}
static PyObject *
Dialect_get_quoting(DialectObj *self)
{
return PyLong_FromLong(self->quoting);
}
static int
_set_bool(const char *name, int *target, PyObject *src, int dflt)
{
if (src == NULL)
*target = dflt;
else
*target = PyObject_IsTrue(src);
return 0;
}
static int
_set_int(const char *name, int *target, PyObject *src, int dflt)
{
if (src == NULL)
*target = dflt;
else {
long value;
if (!PyLong_CheckExact(src)) {
PyErr_Format(PyExc_TypeError,
"\"%s\" must be an integer", name);
return -1;
}
value = PyLong_AsLong(src);
if (value == -1 && PyErr_Occurred())
return -1;
#if SIZEOF_LONG > SIZEOF_INT
if (value > INT_MAX || value < INT_MIN) {
PyErr_Format(PyExc_ValueError,
"integer out of range for \"%s\"", name);
return -1;
}
#endif
*target = (int)value;
}
return 0;
}
static int
_set_char(const char *name, Py_UCS4 *target, PyObject *src, Py_UCS4 dflt)
{
if (src == NULL)
*target = dflt;
else {
*target = '\0';
if (src != Py_None) {
Py_ssize_t len;
len = PyUnicode_GetLength(src);
if (len > 1) {
PyErr_Format(PyExc_TypeError,
"\"%s\" must be an 1-character string",
name);
return -1;
}
if (len > 0)
*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 (!IS_BASESTRING(src)) {
PyErr_Format(PyExc_TypeError,
"\"%s\" must be a string", name);
return -1;
}
else {
Py_XDECREF(*target);
Py_INCREF(src);
*target = src;
}
}
return 0;
}
static int
dialect_check_quoting(int quoting)
{
StyleDesc *qs;
for (qs = quote_styles; qs->name; qs++) {
if (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", T_INT, D_OFF(skipinitialspace), READONLY },
{ "doublequote", T_INT, D_OFF(doublequote), READONLY },
{ "strict", T_INT, D_OFF(strict), 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)
{
Py_XDECREF(self->lineterminator);
Py_TYPE(self)->tp_free((PyObject *)self);
}
static char *dialect_kws[] = {
"dialect",
"delimiter",
"doublequote",
"escapechar",
"lineterminator",
"quotechar",
"quoting",
"skipinitialspace",
"strict",
NULL
};
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;
if (dialect != NULL) {
if (IS_BASESTRING(dialect)) {
dialect = get_dialect_from_registry(dialect);
if (dialect == NULL)
return NULL;
}
else
Py_INCREF(dialect);
/* Can we reuse this instance? */
if (PyObject_TypeCheck(dialect, &Dialect_Type) &&
delimiter == 0 &&
doublequote == 0 &&
escapechar == 0 &&
lineterminator == 0 &&
quotechar == 0 &&
quoting == 0 &&
skipinitialspace == 0 &&
strict == 0)
return dialect;
}
self = (DialectObj *)type->tp_alloc(type, 0);
if (self == NULL) {
Py_XDECREF(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) \
if (v == NULL) \
v = PyObject_GetAttrString(dialect, n)
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");
PyErr_Clear();
}
/* 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, 1);
DIASET(_set_char, "escapechar", &self->escapechar, escapechar, 0);
DIASET(_set_str, "lineterminator", &self->lineterminator, lineterminator, "\r\n");
DIASET(_set_char, "quotechar", &self->quotechar, quotechar, '"');
DIASET(_set_int, "quoting", &self->quoting, quoting, QUOTE_MINIMAL);
DIASET(_set_bool, "skipinitialspace", &self->skipinitialspace, skipinitialspace, 0);
DIASET(_set_bool, "strict", &self->strict, strict, 0);
/* validate options */
if (dialect_check_quoting(self->quoting))
goto err;
if (self->delimiter == 0) {
PyErr_SetString(PyExc_TypeError, "delimiter must be set");
goto err;
}
if (quotechar == Py_None && quoting == NULL)
self->quoting = QUOTE_NONE;
if (self->quoting != QUOTE_NONE && self->quotechar == 0) {
PyErr_SetString(PyExc_TypeError,
"quotechar must be set if quoting enabled");
goto err;
}
if (self->lineterminator == 0) {
PyErr_SetString(PyExc_TypeError, "lineterminator must be set");
goto err;
}
ret = (PyObject *)self;
Py_INCREF(self);
err:
Py_XDECREF(self);
Py_XDECREF(dialect);
Py_XDECREF(delimiter);
Py_XDECREF(doublequote);
Py_XDECREF(escapechar);
Py_XDECREF(lineterminator);
Py_XDECREF(quotechar);
Py_XDECREF(quoting);
Py_XDECREF(skipinitialspace);
Py_XDECREF(strict);
return ret;
}
PyDoc_STRVAR(Dialect_Type_doc,
"CSV dialect\n"
"\n"
"The Dialect type records CSV parsing and generation options.\n");
static PyTypeObject Dialect_Type = {
PyVarObject_HEAD_INIT(NULL, 0)
"_csv.Dialect", /* tp_name */
sizeof(DialectObj), /* tp_basicsize */
0, /* tp_itemsize */
/* methods */
(destructor)Dialect_dealloc, /* tp_dealloc */
(printfunc)0, /* tp_print */
(getattrfunc)0, /* tp_getattr */
(setattrfunc)0, /* tp_setattr */
0, /* tp_reserved */
(reprfunc)0, /* tp_repr */
0, /* tp_as_number */
0, /* tp_as_sequence */
0, /* tp_as_mapping */
(hashfunc)0, /* tp_hash */
(ternaryfunc)0, /* tp_call */
(reprfunc)0, /* tp_str */
0, /* tp_getattro */
0, /* tp_setattro */
0, /* tp_as_buffer */
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /* tp_flags */
Dialect_Type_doc, /* tp_doc */
0, /* tp_traverse */
0, /* tp_clear */
0, /* tp_richcompare */
0, /* tp_weaklistoffset */
0, /* tp_iter */
0, /* tp_iternext */
0, /* tp_methods */
Dialect_memberlist, /* tp_members */
Dialect_getsetlist, /* tp_getset */
0, /* tp_base */
0, /* tp_dict */
0, /* tp_descr_get */
0, /* tp_descr_set */
0, /* tp_dictoffset */
0, /* tp_init */
0, /* tp_alloc */
dialect_new, /* tp_new */
0, /* tp_free */
};
/*
* Return an instance of the dialect type, given a Python instance or kwarg
* description of the dialect
*/
static PyObject *
_call_dialect(PyObject *dialect_inst, PyObject *kwargs)
{
PyObject *ctor_args;
PyObject *dialect;
ctor_args = Py_BuildValue(dialect_inst ? "(O)" : "()", dialect_inst);
if (ctor_args == NULL)
return NULL;
dialect = PyObject_Call((PyObject *)&Dialect_Type, ctor_args, kwargs);
Py_DECREF(ctor_args);
return dialect;
}
/*
* 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;
}
PyList_Append(self->fields, field);
Py_DECREF(field);
return 0;
}
static int
parse_grow_buff(ReaderObj *self)
{
if (self->field_size == 0) {
self->field_size = 4096;
if (self->field != NULL)
PyMem_Free(self->field);
self->field = PyMem_New(Py_UCS4, self->field_size);
}
else {
Py_UCS4 *field = self->field;
if (self->field_size > PY_SSIZE_T_MAX / 2) {
PyErr_NoMemory();
return 0;
}
self->field_size *= 2;
self->field = PyMem_Resize(field, Py_UCS4, self->field_size);
}
if (self->field == NULL) {
PyErr_NoMemory();
return 0;
}
return 1;
}
static int
parse_add_char(ReaderObj *self, Py_UCS4 c)
{
if (self->field_len >= field_limit) {
PyErr_Format(error_obj, "field larger than field limit (%ld)",
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, Py_UCS4 c)
{
DialectObj *dialect = self->dialect;
switch (self->state) {
case START_RECORD:
/* start of record */
if (c == '\0')
/* 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 == '\0') {
/* save empty field - return [fields] */
if (parse_save_field(self) < 0)
return -1;
self->state = (c == '\0' ? 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 space 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, c) < 0)
return -1;
self->state = IN_FIELD;
}
break;
case ESCAPED_CHAR:
if (c == '\0')
c = '\n';
if (parse_add_char(self, c) < 0)
return -1;
self->state = IN_FIELD;
break;
case IN_FIELD:
/* in unquoted field */
if (c == '\n' || c == '\r' || c == '\0') {
/* end of line - return [fields] */
if (parse_save_field(self) < 0)
return -1;
self->state = (c == '\0' ? 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, c) < 0)
return -1;
}
break;
case IN_QUOTED_FIELD:
/* in quoted field */
if (c == '\0')
;
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, c) < 0)
return -1;
}
break;
case ESCAPE_IN_QUOTED_FIELD:
if (c == '\0')
c = '\n';
if (parse_add_char(self, c) < 0)
return -1;
self->state = IN_QUOTED_FIELD;
break;
case QUOTE_IN_QUOTED_FIELD:
/* doublequote - seen a quote in an quoted field */
if (dialect->quoting != QUOTE_NONE &&
c == dialect->quotechar) {
/* save "" as " */
if (parse_add_char(self, 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 == '\0') {
/* end of line - return [fields] */
if (parse_save_field(self) < 0)
return -1;
self->state = (c == '\0' ? START_RECORD : EAT_CRNL);
}
else if (!dialect->strict) {
if (parse_add_char(self, c) < 0)
return -1;
self->state = IN_FIELD;
}
else {
/* illegal */
PyErr_Format(error_obj, "'%c' expected after '%c'",
dialect->delimiter,
dialect->quotechar);
return -1;
}
break;
case EAT_CRNL:
if (c == '\n' || c == '\r')
;
else if (c == '\0')
self->state = START_RECORD;
else {
PyErr_Format(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_XDECREF(self->fields);
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;
unsigned int kind;
void *data;
PyObject *lineobj;
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)
PyErr_Format(error_obj,
"newline inside string");
return NULL;
}
if (!PyUnicode_Check(lineobj)) {
PyErr_Format(error_obj,
"iterator should return strings, "
"not %.200s "
"(did you open the file in text mode?)",
lineobj->ob_type->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 (c == '\0') {
Py_DECREF(lineobj);
PyErr_Format(error_obj,
"line contains NULL byte");
goto err;
}
if (parse_process_char(self, c) < 0) {
Py_DECREF(lineobj);
goto err;
}
pos++;
}
Py_DECREF(lineobj);
if (parse_process_char(self, 0) < 0)
goto err;
} while (self->state != START_RECORD);
fields = self->fields;
self->fields = NULL;
err:
return fields;
}
static void
Reader_dealloc(ReaderObj *self)
{
PyObject_GC_UnTrack(self);
Py_XDECREF(self->dialect);
Py_XDECREF(self->input_iter);
Py_XDECREF(self->fields);
if (self->field != NULL)
PyMem_Free(self->field);
PyObject_GC_Del(self);
}
static int
Reader_traverse(ReaderObj *self, visitproc visit, void *arg)
{
Py_VISIT(self->dialect);
Py_VISIT(self->input_iter);
Py_VISIT(self->fields);
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", T_OBJECT, R_OFF(dialect), READONLY },
{ "line_num", T_ULONG, R_OFF(line_num), READONLY },
{ NULL }
};
static PyTypeObject Reader_Type = {
PyVarObject_HEAD_INIT(NULL, 0)
"_csv.reader", /*tp_name*/
sizeof(ReaderObj), /*tp_basicsize*/
0, /*tp_itemsize*/
/* methods */
(destructor)Reader_dealloc, /*tp_dealloc*/
(printfunc)0, /*tp_print*/
(getattrfunc)0, /*tp_getattr*/
(setattrfunc)0, /*tp_setattr*/
0, /*tp_reserved*/
(reprfunc)0, /*tp_repr*/
0, /*tp_as_number*/
0, /*tp_as_sequence*/
0, /*tp_as_mapping*/
(hashfunc)0, /*tp_hash*/
(ternaryfunc)0, /*tp_call*/
(reprfunc)0, /*tp_str*/
0, /*tp_getattro*/
0, /*tp_setattro*/
0, /*tp_as_buffer*/
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE |
Py_TPFLAGS_HAVE_GC, /*tp_flags*/
Reader_Type_doc, /*tp_doc*/
(traverseproc)Reader_traverse, /*tp_traverse*/
(inquiry)Reader_clear, /*tp_clear*/
0, /*tp_richcompare*/
0, /*tp_weaklistoffset*/
PyObject_SelfIter, /*tp_iter*/
(getiterfunc)Reader_iternext, /*tp_iternext*/
Reader_methods, /*tp_methods*/
Reader_memberlist, /*tp_members*/
0, /*tp_getset*/
};
static PyObject *
csv_reader(PyObject *module, PyObject *args, PyObject *keyword_args)
{
PyObject * iterator, * dialect = NULL;
ReaderObj * self = PyObject_GC_New(ReaderObj, &Reader_Type);
if (!self)
return NULL;
self->dialect = NULL;
self->fields = NULL;
self->input_iter = NULL;
self->field = NULL;
self->field_size = 0;
self->line_num = 0;
if (parse_reset(self) < 0) {
Py_DECREF(self);
return NULL;
}
if (!PyArg_UnpackTuple(args, "", 1, 2, &iterator, &dialect)) {
Py_DECREF(self);
return NULL;
}
self->input_iter = PyObject_GetIter(iterator);
if (self->input_iter == NULL) {
PyErr_SetString(PyExc_TypeError,
"argument 1 must be an iterator");
Py_DECREF(self);
return NULL;
}
self->dialect = (DialectObj *)_call_dialect(dialect, keyword_args);
if (self->dialect == NULL) {
Py_DECREF(self);
return NULL;
}
PyObject_GC_Track(self);
return (PyObject *)self;
}
/*
* WRITER
*/
/* ---------------------------------------------------------------- */
static void
join_reset(WriterObj *self)
{
self->rec_len = 0;
self->num_fields = 0;
}
#define MEM_INCR 32768
/* Calculate new record length or append field to record. Return new
* record length.
*/
static Py_ssize_t
join_append_data(WriterObj *self, unsigned int field_kind, void *field_data,
Py_ssize_t field_len, int quote_empty, int *quoted,
int copy_phase)
{
DialectObj *dialect = self->dialect;
int i;
Py_ssize_t rec_len;
#define ADDCH(c) \
do {\
if (copy_phase) \
self->rec[rec_len] = c;\
rec_len++;\
} while(0)
rec_len = self->rec_len;
/* If this is not the first field we need a field separator */
if (self->num_fields > 0)
ADDCH(dialect->delimiter);
/* Handle preceding quote */
if (copy_phase && *quoted)
ADDCH(dialect->quotechar);
/* Copy/count field data */
/* If field is null just pass over */
for (i = 0; field_data && (i < field_len); i++) {
Py_UCS4 c = PyUnicode_READ(field_kind, field_data, i);
int want_escape = 0;
if (c == dialect->delimiter ||
c == dialect->escapechar ||
c == dialect->quotechar ||
PyUnicode_FindChar(
dialect->lineterminator, c, 0,
PyUnicode_GET_LENGTH(dialect->lineterminator), 1) >= 0) {
if (dialect->quoting == QUOTE_NONE)
want_escape = 1;
else {
if (c == dialect->quotechar) {
if (dialect->doublequote)
ADDCH(dialect->quotechar);
else
want_escape = 1;
}
if (!want_escape)
*quoted = 1;
}
if (want_escape) {
if (!dialect->escapechar) {
PyErr_Format(error_obj,
"need to escape, but no escapechar set");
return -1;
}