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-rw-r--r--Modules/_csv.c1465
1 files changed, 1465 insertions, 0 deletions
diff --git a/Modules/_csv.c b/Modules/_csv.c
new file mode 100644
index 0000000..701904a
--- /dev/null
+++ b/Modules/_csv.c
@@ -0,0 +1,1465 @@
+/* TODO:
+*/
+
+#include "Python.h"
+#include "structmember.h"
+
+/* begin 2.2 compatibility macros */
+#ifndef PyDoc_STRVAR
+/* Define macros for inline documentation. */
+#define PyDoc_VAR(name) static char name[]
+#define PyDoc_STRVAR(name,str) PyDoc_VAR(name) = PyDoc_STR(str)
+#ifdef WITH_DOC_STRINGS
+#define PyDoc_STR(str) str
+#else
+#define PyDoc_STR(str) ""
+#endif
+#endif /* ifndef PyDoc_STRVAR */
+
+#ifndef PyMODINIT_FUNC
+# if defined(__cplusplus)
+# define PyMODINIT_FUNC extern "C" void
+# else /* __cplusplus */
+# define PyMODINIT_FUNC void
+# endif /* __cplusplus */
+#endif
+/* end 2.2 compatibility macros */
+
+static PyObject *error_obj; /* CSV exception */
+static PyObject *dialects; /* Dialect registry */
+
+typedef enum {
+ START_RECORD, START_FIELD, ESCAPED_CHAR, IN_FIELD,
+ IN_QUOTED_FIELD, ESCAPE_IN_QUOTED_FIELD, QUOTE_IN_QUOTED_FIELD
+} 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 ""? */
+ char delimiter; /* field separator */
+ char quotechar; /* quote character */
+ char escapechar; /* escape character */
+ int skipinitialspace; /* ignore spaces following delimiter? */
+ PyObject *lineterminator; /* string to write between records */
+ QuoteStyle quoting; /* style of quoting to write */
+
+ int strict; /* raise exception on bad CSV */
+} DialectObj;
+
+staticforward 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 */
+ char *field; /* build current field in here */
+ int field_size; /* size of allocated buffer */
+ int field_len; /* length of current field */
+ int had_parse_error; /* did we have a parse error? */
+} ReaderObj;
+
+staticforward PyTypeObject Reader_Type;
+
+#define ReaderObject_Check(v) ((v)->ob_type == &Reader_Type)
+
+typedef struct {
+ PyObject_HEAD
+
+ PyObject *writeline; /* write output lines to this file */
+
+ DialectObj *dialect; /* parsing dialect */
+
+ char *rec; /* buffer for parser.join */
+ int rec_size; /* size of allocated record */
+ int rec_len; /* length of record */
+ int num_fields; /* number of fields in record */
+} WriterObj;
+
+staticforward 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)
+ return PyErr_Format(error_obj, "unknown dialect");
+ Py_INCREF(dialect_obj);
+ return dialect_obj;
+}
+
+static int
+check_delattr(PyObject *v)
+{
+ if (v == NULL) {
+ PyErr_SetString(PyExc_TypeError,
+ "Cannot delete attribute");
+ return -1;
+ }
+ return 0;
+}
+
+static PyObject *
+get_string(PyObject *str)
+{
+ Py_XINCREF(str);
+ return str;
+}
+
+static int
+set_string(PyObject **str, PyObject *v)
+{
+ if (check_delattr(v) < 0)
+ return -1;
+ if (!PyString_Check(v) && !PyUnicode_Check(v)) {
+ PyErr_BadArgument();
+ return -1;
+ }
+ Py_XDECREF(*str);
+ Py_INCREF(v);
+ *str = v;
+ return 0;
+}
+
+static PyObject *
+get_nullchar_as_None(char c)
+{
+ if (c == '\0') {
+ Py_INCREF(Py_None);
+ return Py_None;
+ }
+ else
+ return PyString_FromStringAndSize((char*)&c, 1);
+}
+
+static int
+set_None_as_nullchar(char * addr, PyObject *v)
+{
+ if (check_delattr(v) < 0)
+ return -1;
+ if (v == Py_None)
+ *addr = '\0';
+ else if (!PyString_Check(v) || PyString_Size(v) != 1) {
+ PyErr_BadArgument();
+ return -1;
+ }
+ else
+ *addr = PyString_AsString(v)[0];
+ return 0;
+}
+
+static PyObject *
+Dialect_get_lineterminator(DialectObj *self)
+{
+ return get_string(self->lineterminator);
+}
+
+static int
+Dialect_set_lineterminator(DialectObj *self, PyObject *value)
+{
+ return set_string(&self->lineterminator, value);
+}
+
+static PyObject *
+Dialect_get_escapechar(DialectObj *self)
+{
+ return get_nullchar_as_None(self->escapechar);
+}
+
+static int
+Dialect_set_escapechar(DialectObj *self, PyObject *value)
+{
+ return set_None_as_nullchar(&self->escapechar, value);
+}
+
+static PyObject *
+Dialect_get_quoting(DialectObj *self)
+{
+ return PyInt_FromLong(self->quoting);
+}
+
+static int
+Dialect_set_quoting(DialectObj *self, PyObject *v)
+{
+ int quoting;
+ StyleDesc *qs = quote_styles;
+
+ if (check_delattr(v) < 0)
+ return -1;
+ if (!PyInt_Check(v)) {
+ PyErr_BadArgument();
+ return -1;
+ }
+ quoting = PyInt_AsLong(v);
+ for (qs = quote_styles; qs->name; qs++) {
+ if (qs->style == quoting) {
+ self->quoting = quoting;
+ return 0;
+ }
+ }
+ PyErr_BadArgument();
+ return -1;
+}
+
+static struct PyMethodDef Dialect_methods[] = {
+ { NULL, NULL }
+};
+
+#define D_OFF(x) offsetof(DialectObj, x)
+
+static struct PyMemberDef Dialect_memberlist[] = {
+ { "quotechar", T_CHAR, D_OFF(quotechar) },
+ { "delimiter", T_CHAR, D_OFF(delimiter) },
+ { "skipinitialspace", T_INT, D_OFF(skipinitialspace) },
+ { "doublequote", T_INT, D_OFF(doublequote) },
+ { "strict", T_INT, D_OFF(strict) },
+ { NULL }
+};
+
+static PyGetSetDef Dialect_getsetlist[] = {
+ { "escapechar", (getter)Dialect_get_escapechar,
+ (setter)Dialect_set_escapechar },
+ { "lineterminator", (getter)Dialect_get_lineterminator,
+ (setter)Dialect_set_lineterminator },
+ { "quoting", (getter)Dialect_get_quoting,
+ (setter)Dialect_set_quoting },
+ {NULL},
+};
+
+static void
+Dialect_dealloc(DialectObj *self)
+{
+ Py_XDECREF(self->lineterminator);
+ /*PyMem_DEL(self);*/
+ self->ob_type->tp_free((PyObject *)self);
+}
+
+static int
+dialect_init(DialectObj * self, PyObject * args, PyObject * kwargs)
+{
+ PyObject *dialect = NULL, *name_obj, *value_obj;
+
+ self->quotechar = '"';
+ self->delimiter = ',';
+ self->escapechar = '\0';
+ self->skipinitialspace = 0;
+ Py_XDECREF(self->lineterminator);
+ self->lineterminator = PyString_FromString("\r\n");
+ if (self->lineterminator == NULL)
+ return -1;
+ self->quoting = QUOTE_MINIMAL;
+ self->doublequote = 1;
+ self->strict = 0;
+
+ if (!PyArg_ParseTuple(args, "|O", &dialect))
+ return -1;
+ Py_XINCREF(dialect);
+ if (kwargs != NULL) {
+ PyObject * key = PyString_FromString("dialect");
+ PyObject * d;
+
+ d = PyDict_GetItem(kwargs, key);
+ if (d) {
+ Py_INCREF(d);
+ Py_XDECREF(dialect);
+ PyDict_DelItem(kwargs, key);
+ dialect = d;
+ }
+ Py_DECREF(key);
+ }
+ if (dialect != NULL) {
+ int i;
+ PyObject * dir_list;
+
+ /* If dialect is a string, look it up in our registry */
+ if (PyString_Check(dialect) || PyUnicode_Check(dialect)) {
+ PyObject * new_dia;
+ new_dia = get_dialect_from_registry(dialect);
+ Py_DECREF(dialect);
+ if (new_dia == NULL)
+ return -1;
+ dialect = new_dia;
+ }
+ /* A class rather than an instance? Instanciate */
+ if (PyObject_TypeCheck(dialect, &PyClass_Type)) {
+ PyObject * new_dia;
+ new_dia = PyObject_CallFunction(dialect, "");
+ Py_DECREF(dialect);
+ if (new_dia == NULL)
+ return -1;
+ dialect = new_dia;
+ }
+ /* Make sure we finally have an instance */
+ if (!PyInstance_Check(dialect) ||
+ (dir_list = PyObject_Dir(dialect)) == NULL) {
+ PyErr_SetString(PyExc_TypeError,
+ "dialect must be an instance");
+ Py_DECREF(dialect);
+ return -1;
+ }
+ /* And extract the attributes */
+ for (i = 0; i < PyList_GET_SIZE(dir_list); ++i) {
+ name_obj = PyList_GET_ITEM(dir_list, i);
+ if (PyString_AsString(name_obj)[0] == '_')
+ continue;
+ value_obj = PyObject_GetAttr(dialect, name_obj);
+ if (value_obj) {
+ if (PyObject_SetAttr((PyObject *)self,
+ name_obj, value_obj)) {
+ Py_DECREF(dir_list);
+ return -1;
+ }
+ Py_DECREF(value_obj);
+ }
+ }
+ Py_DECREF(dir_list);
+ Py_DECREF(dialect);
+ }
+ if (kwargs != NULL) {
+ int pos = 0;
+
+ while (PyDict_Next(kwargs, &pos, &name_obj, &value_obj)) {
+ if (PyObject_SetAttr((PyObject *)self,
+ name_obj, value_obj))
+ return -1;
+ }
+ }
+ return 0;
+}
+
+static PyObject *
+dialect_new(PyTypeObject *type, PyObject *args, PyObject *kwargs)
+{
+ DialectObj *self;
+ self = (DialectObj *)type->tp_alloc(type, 0);
+ if (self != NULL) {
+ self->lineterminator = NULL;
+ }
+ return (PyObject *)self;
+}
+
+
+PyDoc_STRVAR(Dialect_Type_doc,
+"CSV dialect\n"
+"\n"
+"The Dialect type records CSV parsing and generation options.\n");
+
+static PyTypeObject Dialect_Type = {
+ PyObject_HEAD_INIT(NULL)
+ 0, /* ob_size */
+ "_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 */
+ (cmpfunc)0, /* tp_compare */
+ (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 */
+ Dialect_methods, /* 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 */
+ (initproc)dialect_init, /* tp_init */
+ PyType_GenericAlloc, /* tp_alloc */
+ dialect_new, /* tp_new */
+ 0, /* tp_free */
+};
+
+static void
+parse_save_field(ReaderObj *self)
+{
+ PyObject *field;
+
+ field = PyString_FromStringAndSize(self->field, self->field_len);
+ if (field != NULL) {
+ PyList_Append(self->fields, field);
+ Py_XDECREF(field);
+ }
+ self->field_len = 0;
+}
+
+static int
+parse_grow_buff(ReaderObj *self)
+{
+ if (self->field_size == 0) {
+ self->field_size = 4096;
+ self->field = PyMem_Malloc(self->field_size);
+ }
+ else {
+ self->field_size *= 2;
+ self->field = PyMem_Realloc(self->field, self->field_size);
+ }
+ if (self->field == NULL) {
+ PyErr_NoMemory();
+ return 0;
+ }
+ return 1;
+}
+
+static void
+parse_add_char(ReaderObj *self, char c)
+{
+ if (self->field_len == self->field_size && !parse_grow_buff(self))
+ return;
+ self->field[self->field_len++] = c;
+}
+
+static void
+parse_process_char(ReaderObj *self, char c)
+{
+ DialectObj *dialect = self->dialect;
+
+ switch (self->state) {
+ case START_RECORD:
+ /* start of record */
+ if (c == '\n')
+ /* empty line - return [] */
+ break;
+ /* normal character - handle as START_FIELD */
+ self->state = START_FIELD;
+ /* fallthru */
+ case START_FIELD:
+ /* expecting field */
+ if (c == '\n') {
+ /* save empty field - return [fields] */
+ parse_save_field(self);
+ self->state = START_RECORD;
+ }
+ else if (c == dialect->quotechar) {
+ /* 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 */
+ parse_save_field(self);
+ }
+ else {
+ /* begin new unquoted field */
+ parse_add_char(self, c);
+ self->state = IN_FIELD;
+ }
+ break;
+
+ case ESCAPED_CHAR:
+ if (c != dialect->escapechar &&
+ c != dialect->delimiter &&
+ c != dialect->quotechar)
+ parse_add_char(self, dialect->escapechar);
+ parse_add_char(self, c);
+ self->state = IN_FIELD;
+ break;
+
+ case IN_FIELD:
+ /* in unquoted field */
+ if (c == '\n') {
+ /* end of line - return [fields] */
+ parse_save_field(self);
+ self->state = START_RECORD;
+ }
+ else if (c == dialect->escapechar) {
+ /* possible escaped character */
+ self->state = ESCAPED_CHAR;
+ }
+ else if (c == dialect->delimiter) {
+ /* save field - wait for new field */
+ parse_save_field(self);
+ self->state = START_FIELD;
+ }
+ else {
+ /* normal character - save in field */
+ parse_add_char(self, c);
+ }
+ break;
+
+ case IN_QUOTED_FIELD:
+ /* in quoted field */
+ if (c == '\n') {
+ /* end of line - save '\n' in field */
+ parse_add_char(self, '\n');
+ }
+ else if (c == dialect->escapechar) {
+ /* Possible escape character */
+ self->state = ESCAPE_IN_QUOTED_FIELD;
+ }
+ else if (c == dialect->quotechar) {
+ 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 */
+ parse_add_char(self, c);
+ }
+ break;
+
+ case ESCAPE_IN_QUOTED_FIELD:
+ if (c != dialect->escapechar &&
+ c != dialect->delimiter &&
+ c != dialect->quotechar)
+ parse_add_char(self, dialect->escapechar);
+ parse_add_char(self, c);
+ 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 " */
+ parse_add_char(self, c);
+ self->state = IN_QUOTED_FIELD;
+ }
+ else if (c == dialect->delimiter) {
+ /* save field - wait for new field */
+ parse_save_field(self);
+ self->state = START_FIELD;
+ }
+ else if (c == '\n') {
+ /* end of line - return [fields] */
+ parse_save_field(self);
+ self->state = START_RECORD;
+ }
+ else if (!dialect->strict) {
+ parse_add_char(self, c);
+ self->state = IN_FIELD;
+ }
+ else {
+ /* illegal */
+ self->had_parse_error = 1;
+ PyErr_Format(error_obj, "%c expected after %c",
+ dialect->delimiter,
+ dialect->quotechar);
+ }
+ break;
+
+ }
+}
+
+/*
+ * READER
+ */
+#define R_OFF(x) offsetof(ReaderObj, x)
+
+static struct PyMemberDef Reader_memberlist[] = {
+ { "dialect", T_OBJECT, R_OFF(dialect), RO },
+ { NULL }
+};
+
+static PyObject *
+Reader_getiter(ReaderObj *self)
+{
+ Py_INCREF(self);
+ return (PyObject *)self;
+}
+
+static PyObject *
+Reader_iternext(ReaderObj *self)
+{
+ PyObject *lineobj;
+ PyObject *fields;
+ char *line;
+
+ do {
+ lineobj = PyIter_Next(self->input_iter);
+ if (lineobj == NULL) {
+ /* End of input OR exception */
+ if (!PyErr_Occurred() && self->field_len != 0)
+ return PyErr_Format(error_obj,
+ "newline inside string");
+ return NULL;
+ }
+
+ if (self->had_parse_error) {
+ if (self->fields) {
+ Py_XDECREF(self->fields);
+ }
+ self->fields = PyList_New(0);
+ self->field_len = 0;
+ self->state = START_RECORD;
+ self->had_parse_error = 0;
+ }
+ line = PyString_AsString(lineobj);
+
+ if (line == NULL) {
+ Py_DECREF(lineobj);
+ return NULL;
+ }
+ if (strlen(line) < PyString_GET_SIZE(lineobj)) {
+ self->had_parse_error = 1;
+ Py_DECREF(lineobj);
+ return PyErr_Format(error_obj,
+ "string with NUL bytes");
+ }
+
+ /* Process line of text - send '\n' to processing code to
+ represent end of line. End of line which is not at end of
+ string is an error. */
+ while (*line) {
+ char c;
+
+ c = *line++;
+ if (c == '\r') {
+ c = *line++;
+ if (c == '\0')
+ /* macintosh end of line */
+ break;
+ if (c == '\n') {
+ c = *line++;
+ if (c == '\0')
+ /* DOS end of line */
+ break;
+ }
+ self->had_parse_error = 1;
+ Py_DECREF(lineobj);
+ return PyErr_Format(error_obj,
+ "newline inside string");
+ }
+ if (c == '\n') {
+ c = *line++;
+ if (c == '\0')
+ /* unix end of line */
+ break;
+ self->had_parse_error = 1;
+ Py_DECREF(lineobj);
+ return PyErr_Format(error_obj,
+ "newline inside string");
+ }
+ parse_process_char(self, c);
+ if (PyErr_Occurred()) {
+ Py_DECREF(lineobj);
+ return NULL;
+ }
+ }
+ parse_process_char(self, '\n');
+ Py_DECREF(lineobj);
+ } while (self->state != START_RECORD);
+
+ fields = self->fields;
+ self->fields = PyList_New(0);
+ return fields;
+}
+
+static void
+Reader_dealloc(ReaderObj *self)
+{
+ Py_XDECREF(self->dialect);
+ Py_XDECREF(self->input_iter);
+ Py_XDECREF(self->fields);
+ PyMem_DEL(self);
+}
+
+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 }
+};
+
+static PyTypeObject Reader_Type = {
+ PyObject_HEAD_INIT(NULL)
+ 0, /*ob_size*/
+ "_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*/
+ (cmpfunc)0, /*tp_compare*/
+ (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*/
+ Reader_Type_doc, /*tp_doc*/
+ 0, /*tp_traverse*/
+ 0, /*tp_clear*/
+ 0, /*tp_richcompare*/
+ 0, /*tp_weaklistoffset*/
+ (getiterfunc)Reader_getiter, /*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, *ctor_args;
+ ReaderObj * self = PyObject_NEW(ReaderObj, &Reader_Type);
+
+ if (!self)
+ return NULL;
+
+ self->dialect = NULL;
+ self->input_iter = self->fields = NULL;
+
+ self->fields = NULL;
+ self->input_iter = NULL;
+ self->had_parse_error = 0;
+ self->field = NULL;
+ self->field_size = 0;
+ self->field_len = 0;
+ self->state = START_RECORD;
+
+ if (!PyArg_ParseTuple(args, "O|O", &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;
+ }
+ ctor_args = Py_BuildValue(dialect ? "(O)" : "()", dialect);
+ if (ctor_args == NULL) {
+ Py_DECREF(self);
+ return NULL;
+ }
+ self->dialect = (DialectObj *)PyObject_Call((PyObject *)&Dialect_Type,
+ ctor_args, keyword_args);
+ Py_DECREF(ctor_args);
+ if (self->dialect == NULL) {
+ Py_DECREF(self);
+ return NULL;
+ }
+ self->fields = PyList_New(0);
+ if (self->fields == NULL) {
+ Py_DECREF(self);
+ return NULL;
+ }
+
+ 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 int
+join_append_data(WriterObj *self, char *field, int quote_empty,
+ int *quoted, int copy_phase)
+{
+ DialectObj *dialect = self->dialect;
+ int i, rec_len;
+
+ rec_len = self->rec_len;
+
+ /* If this is not the first field we need a field separator.
+ */
+ if (self->num_fields > 0) {
+ if (copy_phase)
+ self->rec[rec_len] = dialect->delimiter;
+ rec_len++;
+ }
+ /* Handle preceding quote.
+ */
+ switch (dialect->quoting) {
+ case QUOTE_ALL:
+ *quoted = 1;
+ if (copy_phase)
+ self->rec[rec_len] = dialect->quotechar;
+ rec_len++;
+ break;
+ case QUOTE_MINIMAL:
+ case QUOTE_NONNUMERIC:
+ /* We only know about quoted in the copy phase.
+ */
+ if (copy_phase && *quoted) {
+ self->rec[rec_len] = dialect->quotechar;
+ rec_len++;
+ }
+ break;
+ case QUOTE_NONE:
+ break;
+ }
+ /* Copy/count field data.
+ */
+ for (i = 0;; i++) {
+ char c = field[i];
+
+ if (c == '\0')
+ break;
+ /* If in doublequote mode we escape quote chars with a
+ * quote.
+ */
+ if (dialect->quoting != QUOTE_NONE &&
+ c == dialect->quotechar && dialect->doublequote) {
+ if (copy_phase)
+ self->rec[rec_len] = dialect->quotechar;
+ *quoted = 1;
+ rec_len++;
+ }
+
+ /* Some special characters need to be escaped. If we have a
+ * quote character switch to quoted field instead of escaping
+ * individual characters.
+ */
+ if (!*quoted
+ && (c == dialect->delimiter ||
+ c == dialect->escapechar ||
+ c == '\n' || c == '\r')) {
+ if (dialect->quoting != QUOTE_NONE)
+ *quoted = 1;
+ else if (dialect->escapechar) {
+ if (copy_phase)
+ self->rec[rec_len] = dialect->escapechar;
+ rec_len++;
+ }
+ else {
+ PyErr_Format(error_obj,
+ "delimiter must be quoted or escaped");
+ return -1;
+ }
+ }
+ /* Copy field character into record buffer.
+ */
+ if (copy_phase)
+ self->rec[rec_len] = c;
+ rec_len++;
+ }
+
+ /* If field is empty check if it needs to be quoted.
+ */
+ if (i == 0 && quote_empty) {
+ if (dialect->quoting == QUOTE_NONE) {
+ PyErr_Format(error_obj,
+ "single empty field record must be quoted");
+ return -1;
+ } else
+ *quoted = 1;
+ }
+
+ /* Handle final quote character on field.
+ */
+ if (*quoted) {
+ if (copy_phase)
+ self->rec[rec_len] = dialect->quotechar;
+ else
+ /* Didn't know about leading quote until we found it
+ * necessary in field data - compensate for it now.
+ */
+ rec_len++;
+ rec_len++;
+ }
+
+ return rec_len;
+}
+
+static int
+join_check_rec_size(WriterObj *self, int rec_len)
+{
+ if (rec_len > self->rec_size) {
+ if (self->rec_size == 0) {
+ self->rec_size = (rec_len / MEM_INCR + 1) * MEM_INCR;
+ self->rec = PyMem_Malloc(self->rec_size);
+ }
+ else {
+ char *old_rec = self->rec;
+
+ self->rec_size = (rec_len / MEM_INCR + 1) * MEM_INCR;
+ self->rec = PyMem_Realloc(self->rec, self->rec_size);
+ if (self->rec == NULL)
+ PyMem_Free(old_rec);
+ }
+ if (self->rec == NULL) {
+ PyErr_NoMemory();
+ return 0;
+ }
+ }
+ return 1;
+}
+
+static int
+join_append(WriterObj *self, char *field, int *quoted, int quote_empty)
+{
+ int rec_len;
+
+ rec_len = join_append_data(self, field, quote_empty, quoted, 0);
+ if (rec_len < 0)
+ return 0;
+
+ /* grow record buffer if necessary */
+ if (!join_check_rec_size(self, rec_len))
+ return 0;
+
+ self->rec_len = join_append_data(self, field, quote_empty, quoted, 1);
+ self->num_fields++;
+
+ return 1;
+}
+
+static int
+join_append_lineterminator(WriterObj *self)
+{
+ int terminator_len;
+
+ terminator_len = PyString_Size(self->dialect->lineterminator);
+
+ /* grow record buffer if necessary */
+ if (!join_check_rec_size(self, self->rec_len + terminator_len))
+ return 0;
+
+ memmove(self->rec + self->rec_len,
+ PyString_AsString(self->dialect->lineterminator),
+ terminator_len);
+ self->rec_len += terminator_len;
+
+ return 1;
+}
+
+PyDoc_STRVAR(csv_writerow_doc,
+"join(sequence) -> string\n"
+"\n"
+"Construct a CSV record from a sequence of fields. Non-string\n"
+"elements will be converted to string.");
+
+static PyObject *
+csv_writerow(WriterObj *self, PyObject *seq)
+{
+ DialectObj *dialect = self->dialect;
+ int len, i;
+
+ if (!PySequence_Check(seq))
+ return PyErr_Format(error_obj, "sequence expected");
+
+ len = PySequence_Length(seq);
+ if (len < 0)
+ return NULL;
+
+ /* Join all fields in internal buffer.
+ */
+ join_reset(self);
+ for (i = 0; i < len; i++) {
+ PyObject *field;
+ int append_ok;
+ int quoted;
+
+ field = PySequence_GetItem(seq, i);
+ if (field == NULL)
+ return NULL;
+
+ quoted = 0;
+ if (dialect->quoting == QUOTE_NONNUMERIC) {
+ PyObject *num;
+
+ num = PyNumber_Float(field);
+ if (num == NULL) {
+ quoted = 1;
+ PyErr_Clear();
+ }
+ else {
+ Py_DECREF(num);
+ }
+ }
+
+ if (PyString_Check(field)) {
+ append_ok = join_append(self, PyString_AsString(field),
+ &quoted, len == 1);
+ Py_DECREF(field);
+ }
+ else if (field == Py_None) {
+ append_ok = join_append(self, "", &quoted, len == 1);
+ Py_DECREF(field);
+ }
+ else {
+ PyObject *str;
+
+ str = PyObject_Str(field);
+ Py_DECREF(field);
+ if (str == NULL)
+ return NULL;
+
+ append_ok = join_append(self, PyString_AsString(str),
+ &quoted, len == 1);
+ Py_DECREF(str);
+ }
+ if (!append_ok)
+ return NULL;
+ }
+
+ /* Add line terminator.
+ */
+ if (!join_append_lineterminator(self))
+ return 0;
+
+ return PyObject_CallFunction(self->writeline,
+ "(s#)", self->rec, self->rec_len);
+}
+
+static PyObject *
+csv_writerows(WriterObj *self, PyObject *seqseq)
+{
+ PyObject *row_iter, *row_obj, *result;
+
+ row_iter = PyObject_GetIter(seqseq);
+ if (row_iter == NULL) {
+ PyErr_SetString(PyExc_TypeError,
+ "writerows() argument must be iteratable");
+ return NULL;
+ }
+ while ((row_obj = PyIter_Next(row_iter))) {
+ result = csv_writerow(self, row_obj);
+ Py_DECREF(row_obj);
+ if (!result) {
+ Py_DECREF(row_iter);
+ return NULL;
+ }
+ else
+ Py_DECREF(result);
+ }
+ Py_DECREF(row_iter);
+ if (PyErr_Occurred())
+ return NULL;
+ Py_INCREF(Py_None);
+ return Py_None;
+}
+
+static struct PyMethodDef Writer_methods[] = {
+ { "writerow", (PyCFunction)csv_writerow, METH_O, csv_writerow_doc},
+ { "writerows", (PyCFunction)csv_writerows, METH_O},
+ { NULL, NULL }
+};
+
+#define W_OFF(x) offsetof(WriterObj, x)
+
+static struct PyMemberDef Writer_memberlist[] = {
+ { "dialect", T_OBJECT, W_OFF(dialect), RO },
+ { NULL }
+};
+
+static void
+Writer_dealloc(WriterObj *self)
+{
+ Py_XDECREF(self->dialect);
+ Py_XDECREF(self->writeline);
+ PyMem_DEL(self);
+}
+
+PyDoc_STRVAR(Writer_Type_doc,
+"CSV writer\n"
+"\n"
+"Writer objects are responsible for generating tabular data\n"
+"in CSV format from sequence input.\n"
+);
+
+static PyTypeObject Writer_Type = {
+ PyObject_HEAD_INIT(NULL)
+ 0, /*ob_size*/
+ "_csv.writer", /*tp_name*/
+ sizeof(WriterObj), /*tp_basicsize*/
+ 0, /*tp_itemsize*/
+ /* methods */
+ (destructor)Writer_dealloc, /*tp_dealloc*/
+ (printfunc)0, /*tp_print*/
+ (getattrfunc)0, /*tp_getattr*/
+ (setattrfunc)0, /*tp_setattr*/
+ (cmpfunc)0, /*tp_compare*/
+ (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*/
+ Writer_Type_doc,
+ 0, /*tp_traverse*/
+ 0, /*tp_clear*/
+ 0, /*tp_richcompare*/
+ 0, /*tp_weaklistoffset*/
+ (getiterfunc)0, /*tp_iter*/
+ (getiterfunc)0, /*tp_iternext*/
+ Writer_methods, /*tp_methods*/
+ Writer_memberlist, /*tp_members*/
+ 0, /*tp_getset*/
+};
+
+static PyObject *
+csv_writer(PyObject *module, PyObject *args, PyObject *keyword_args)
+{
+ PyObject * output_file, * dialect = NULL, *ctor_args;
+ WriterObj * self = PyObject_NEW(WriterObj, &Writer_Type);
+
+ if (!self)
+ return NULL;
+
+ self->dialect = NULL;
+ self->writeline = NULL;
+
+ self->rec = NULL;
+ self->rec_size = 0;
+ self->rec_len = 0;
+ self->num_fields = 0;
+
+ if (!PyArg_ParseTuple(args, "O|O", &output_file, &dialect)) {
+ Py_DECREF(self);
+ return NULL;
+ }
+ self->writeline = PyObject_GetAttrString(output_file, "write");
+ if (self->writeline == NULL || !PyCallable_Check(self->writeline)) {
+ PyErr_SetString(PyExc_TypeError,
+ "argument 1 must be an instance with a write method");
+ Py_DECREF(self);
+ return NULL;
+ }
+ ctor_args = Py_BuildValue(dialect ? "(O)" : "()", dialect);
+ if (ctor_args == NULL) {
+ Py_DECREF(self);
+ return NULL;
+ }
+ self->dialect = (DialectObj *)PyObject_Call((PyObject *)&Dialect_Type,
+ ctor_args, keyword_args);
+ Py_DECREF(ctor_args);
+ if (self->dialect == NULL) {
+ Py_DECREF(self);
+ return NULL;
+ }
+ return (PyObject *)self;
+}
+
+/*
+ * DIALECT REGISTRY
+ */
+static PyObject *
+csv_list_dialects(PyObject *module, PyObject *args)
+{
+ return PyDict_Keys(dialects);
+}
+
+static PyObject *
+csv_register_dialect(PyObject *module, PyObject *args)
+{
+ PyObject *name_obj, *dialect_obj;
+
+ if (!PyArg_ParseTuple(args, "OO", &name_obj, &dialect_obj))
+ return NULL;
+ if (!PyString_Check(name_obj) && !PyUnicode_Check(name_obj)) {
+ PyErr_SetString(PyExc_TypeError,
+ "dialect name must be a string or unicode");
+ return NULL;
+ }
+ Py_INCREF(dialect_obj);
+ /* A class rather than an instance? Instanciate */
+ if (PyObject_TypeCheck(dialect_obj, &PyClass_Type)) {
+ PyObject * new_dia;
+ new_dia = PyObject_CallFunction(dialect_obj, "");
+ Py_DECREF(dialect_obj);
+ if (new_dia == NULL)
+ return NULL;
+ dialect_obj = new_dia;
+ }
+ /* Make sure we finally have an instance */
+ if (!PyInstance_Check(dialect_obj)) {
+ PyErr_SetString(PyExc_TypeError, "dialect must be an instance");
+ Py_DECREF(dialect_obj);
+ return NULL;
+ }
+ if (PyObject_SetAttrString(dialect_obj, "_name", name_obj) < 0) {
+ Py_DECREF(dialect_obj);
+ return NULL;
+ }
+ if (PyDict_SetItem(dialects, name_obj, dialect_obj) < 0) {
+ Py_DECREF(dialect_obj);
+ return NULL;
+ }
+ Py_DECREF(dialect_obj);
+ Py_INCREF(Py_None);
+ return Py_None;
+}
+
+static PyObject *
+csv_unregister_dialect(PyObject *module, PyObject *args)
+{
+ PyObject *name_obj;
+
+ if (!PyArg_ParseTuple(args, "O", &name_obj))
+ return NULL;
+ if (PyDict_DelItem(dialects, name_obj) < 0)
+ return PyErr_Format(error_obj, "unknown dialect");
+ Py_INCREF(Py_None);
+ return Py_None;
+}
+
+static PyObject *
+csv_get_dialect(PyObject *module, PyObject *args)
+{
+ PyObject *name_obj;
+
+ if (!PyArg_ParseTuple(args, "O", &name_obj))
+ return NULL;
+ return get_dialect_from_registry(name_obj);
+}
+
+/*
+ * MODULE
+ */
+
+PyDoc_STRVAR(csv_module_doc,
+"CSV parsing and writing.\n"
+"\n"
+"This module provides classes that assist in the reading and writing\n"
+"of Comma Separated Value (CSV) files, and implements the interface\n"
+"described by PEP 305. Although many CSV files are simple to parse,\n"
+"the format is not formally defined by a stable specification and\n"
+"is subtle enough that parsing lines of a CSV file with something\n"
+"like line.split(\",\") is bound to fail. The module supports three\n"
+"basic APIs: reading, writing, and registration of dialects.\n"
+"\n"
+"\n"
+"DIALECT REGISTRATION:\n"
+"\n"
+"Readers and writers support a dialect argument, which is a convenient\n"
+"handle on a group of settings. When the dialect argument is a string,\n"
+"it identifies one of the dialects previously registered with the module.\n"
+"If it is a class or instance, the attributes of the argument are used as\n"
+"the settings for the reader or writer:\n"
+"\n"
+" class excel:\n"
+" delimiter = ','\n"
+" quotechar = '\"'\n"
+" escapechar = None\n"
+" doublequote = True\n"
+" skipinitialspace = False\n"
+" lineterminator = '\r\n'\n"
+" quoting = QUOTE_MINIMAL\n"
+"\n"
+"SETTINGS:\n"
+"\n"
+" * quotechar - specifies a one-character string to use as the \n"
+" quoting character. It defaults to '\"'.\n"
+" * delimiter - specifies a one-character string to use as the \n"
+" field separator. It defaults to ','.\n"
+" * skipinitialspace - specifies how to interpret whitespace which\n"
+" immediately follows a delimiter. It defaults to False, which\n"
+" means that whitespace immediately following a delimiter is part\n"
+" of the following field.\n"
+" * lineterminator - specifies the character sequence which should \n"
+" terminate rows.\n"
+" * quoting - controls when quotes should be generated by the writer.\n"
+" It can take on any of the following module constants:\n"
+"\n"
+" csv.QUOTE_MINIMAL means only when required, for example, when a\n"
+" field contains either the quotechar or the delimiter\n"
+" csv.QUOTE_ALL means that quotes are always placed around fields.\n"
+" csv.QUOTE_NONNUMERIC means that quotes are always placed around\n"
+" fields which contain characters other than [+-0-9.].\n"
+" csv.QUOTE_NONE means that quotes are never placed around fields.\n"
+" * escapechar - specifies a one-character string used to escape \n"
+" the delimiter when quoting is set to QUOTE_NONE.\n"
+" * doublequote - controls the handling of quotes inside fields. When\n"
+" True, two consecutive quotes are interpreted as one during read,\n"
+" and when writing, each quote character embedded in the data is\n"
+" written as two quotes\n");
+
+PyDoc_STRVAR(csv_reader_doc,
+" csv_reader = reader(iterable [, dialect='excel']\n"
+" [optional keyword args])\n"
+" for row in csv_reader:\n"
+" process(row)\n"
+"\n"
+"The \"iterable\" argument can be any object that returns a line\n"
+"of input for each iteration, such as a file object or a list. The\n"
+"optional \"dialect\" parameter is discussed below. The function\n"
+"also accepts optional keyword arguments which override settings\n"
+"provided by the dialect.\n"
+"\n"
+"The returned object is an iterator. Each iteration returns a row\n"
+ "of the CSV file (which can span multiple input lines):\n");
+
+PyDoc_STRVAR(csv_writer_doc,
+" csv_writer = csv.writer(fileobj [, dialect='excel']\n"
+" [optional keyword args])\n"
+" for row in csv_writer:\n"
+" csv_writer.writerow(row)\n"
+"\n"
+" [or]\n"
+"\n"
+" csv_writer = csv.writer(fileobj [, dialect='excel']\n"
+" [optional keyword args])\n"
+" csv_writer.writerows(rows)\n"
+"\n"
+"The \"fileobj\" argument can be any object that supports the file API.\n");
+
+PyDoc_STRVAR(csv_list_dialects_doc,
+"Return a list of all know dialect names.\n"
+" names = csv.list_dialects()");
+
+PyDoc_STRVAR(csv_get_dialect_doc,
+"Return the dialect instance associated with name.\n"
+" dialect = csv.get_dialect(name)");
+
+PyDoc_STRVAR(csv_register_dialect_doc,
+"Create a mapping from a string name to a dialect class.\n"
+" dialect = csv.register_dialect(name, dialect)");
+
+PyDoc_STRVAR(csv_unregister_dialect_doc,
+"Delete the name/dialect mapping associated with a string name.\n"
+" csv.unregister_dialect(name)");
+
+static struct PyMethodDef csv_methods[] = {
+ { "reader", (PyCFunction)csv_reader,
+ METH_VARARGS | METH_KEYWORDS, csv_reader_doc},
+ { "writer", (PyCFunction)csv_writer,
+ METH_VARARGS | METH_KEYWORDS, csv_writer_doc},
+ { "list_dialects", (PyCFunction)csv_list_dialects,
+ METH_NOARGS, csv_list_dialects_doc},
+ { "register_dialect", (PyCFunction)csv_register_dialect,
+ METH_VARARGS, csv_register_dialect_doc},
+ { "unregister_dialect", (PyCFunction)csv_unregister_dialect,
+ METH_VARARGS, csv_unregister_dialect_doc},
+ { "get_dialect", (PyCFunction)csv_get_dialect,
+ METH_VARARGS, csv_get_dialect_doc},
+ { NULL, NULL }
+};
+
+PyMODINIT_FUNC
+init_csv(void)
+{
+ PyObject *module;
+ PyObject *rev;
+ PyObject *v;
+ int res;
+ StyleDesc *style;
+
+ if (PyType_Ready(&Dialect_Type) < 0)
+ return;
+
+ if (PyType_Ready(&Reader_Type) < 0)
+ return;
+
+ if (PyType_Ready(&Writer_Type) < 0)
+ return;
+
+ /* Create the module and add the functions */
+ module = Py_InitModule3("_csv", csv_methods, csv_module_doc);
+ if (module == NULL)
+ return;
+
+ /* Add version to the module. */
+ rev = PyString_FromString("1.0");
+ if (rev == NULL)
+ return;
+ if (PyModule_AddObject(module, "__version__", rev) < 0)
+ return;
+
+ /* Add _dialects dictionary */
+ dialects = PyDict_New();
+ if (dialects == NULL)
+ return;
+ if (PyModule_AddObject(module, "_dialects", dialects))
+ return;
+
+ /* Add quote styles into dictionary */
+ for (style = quote_styles; style->name; style++) {
+ v = PyInt_FromLong(style->style);
+ if (v == NULL)
+ return;
+ res = PyModule_AddObject(module, style->name, v);
+ if (res < 0)
+ return;
+ }
+
+ /* Add the Dialect type */
+ if (PyModule_AddObject(module, "Dialect", (PyObject *)&Dialect_Type))
+ return;
+
+ /* Add the CSV exception object to the module. */
+ error_obj = PyErr_NewException("_csv.Error", NULL, NULL);
+ if (error_obj == NULL)
+ return;
+ PyModule_AddObject(module, "Error", error_obj);
+}
generated by cgit v0.12 at 2024-12-02 06:52:42 (GMT)