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Copy pathcsv.rs
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1375 lines (1221 loc) · 48.4 KB
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pub(crate) use _csv::module_def;
#[pymodule]
mod _csv {
use crate::common::lock::PyMutex;
use crate::vm::{
AsObject, Py, PyObject, PyObjectRef, PyPayload, PyRef, PyResult, TryFromObject,
VirtualMachine,
builtins::{PyBaseExceptionRef, PyInt, PyNone, PyStr, PyType, PyTypeRef, PyUtf8StrRef},
function::{ArgIterable, ArgumentError, FromArgs, FuncArgs, OptionalArg},
protocol::{PyIter, PyIterReturn},
raise_if_stop,
types::{Constructor, IterNext, Iterable, SelfIter},
};
use alloc::fmt;
use csv_core::Terminator;
use itertools::{self, Itertools};
use parking_lot::Mutex;
use rustpython_common::{lock::LazyLock, wtf8::Wtf8Buf};
use rustpython_vm::{match_class, sliceable::SliceableSequenceOp};
use std::collections::HashMap;
#[pyattr]
const QUOTE_MINIMAL: i32 = QuoteStyle::Minimal as i32;
#[pyattr]
const QUOTE_ALL: i32 = QuoteStyle::All as i32;
#[pyattr]
const QUOTE_NONNUMERIC: i32 = QuoteStyle::Nonnumeric as i32;
#[pyattr]
const QUOTE_NONE: i32 = QuoteStyle::None as i32;
#[pyattr]
const QUOTE_STRINGS: i32 = QuoteStyle::Strings as i32;
#[pyattr]
const QUOTE_NOTNULL: i32 = QuoteStyle::Notnull as i32;
#[pyattr(name = "__version__")]
const __VERSION__: &str = "1.0";
#[pyattr(name = "Error", once)]
fn error(vm: &VirtualMachine) -> PyTypeRef {
vm.ctx.new_exception_type(
"_csv",
"Error",
Some(vec![vm.ctx.exceptions.exception_type.to_owned()]),
)
}
static GLOBAL_HASHMAP: LazyLock<Mutex<HashMap<String, PyDialect>>> = LazyLock::new(|| {
let m = HashMap::new();
Mutex::new(m)
});
static GLOBAL_FIELD_LIMIT: LazyLock<Mutex<isize>> = LazyLock::new(|| Mutex::new(131072));
fn new_csv_error(vm: &VirtualMachine, msg: impl Into<Wtf8Buf>) -> PyBaseExceptionRef {
vm.new_exception_msg(super::_csv::error(vm), msg.into())
}
#[pyattr]
#[pyclass(module = "csv", name = "Dialect")]
#[derive(Debug, PyPayload, Clone, Copy)]
struct PyDialect {
delimiter: u8,
quotechar: Option<u8>,
escapechar: Option<u8>,
doublequote: bool,
skipinitialspace: bool,
lineterminator: csv_core::Terminator,
quoting: QuoteStyle,
strict: bool,
}
impl Constructor for PyDialect {
type Args = PyObjectRef;
fn py_new(_cls: &Py<PyType>, ctx: Self::Args, vm: &VirtualMachine) -> PyResult<Self> {
Self::try_from_object(vm, ctx)
}
}
#[pyclass(with(Constructor))]
impl PyDialect {
#[pygetset]
fn delimiter(&self, vm: &VirtualMachine) -> PyRef<PyStr> {
vm.ctx.new_str(format!("{}", self.delimiter as char))
}
#[pygetset]
fn quotechar(&self, vm: &VirtualMachine) -> Option<PyRef<PyStr>> {
Some(vm.ctx.new_str(format!("{}", self.quotechar? as char)))
}
#[pygetset]
const fn doublequote(&self) -> bool {
self.doublequote
}
#[pygetset]
const fn skipinitialspace(&self) -> bool {
self.skipinitialspace
}
#[pygetset]
fn lineterminator(&self, vm: &VirtualMachine) -> PyRef<PyStr> {
match self.lineterminator {
Terminator::CRLF => vm.ctx.new_str("\r\n".to_string()),
Terminator::Any(t) => vm.ctx.new_str(format!("{}", t as char)),
_ => unreachable!(),
}
}
#[pygetset]
fn quoting(&self) -> isize {
self.quoting.into()
}
#[pygetset]
fn escapechar(&self, vm: &VirtualMachine) -> Option<PyRef<PyStr>> {
Some(vm.ctx.new_str(format!("{}", self.escapechar? as char)))
}
#[pygetset(name = "strict")]
const fn get_strict(&self) -> bool {
self.strict
}
}
/// Parses the delimiter from a Python object and returns its ASCII value.
///
/// This function attempts to extract the 'delimiter' attribute from the given Python object and ensures that the attribute is a single-character string. If successful, it returns the ASCII value of the character. If the attribute is not a single-character string, an error is returned.
///
/// # Arguments
///
/// * `vm` - A reference to the VirtualMachine, used for executing Python code and manipulating Python objects.
/// * `obj` - A reference to the PyObjectRef from which the 'delimiter' attribute is to be parsed.
///
/// # Returns
///
/// If successful, returns a `PyResult<u8>` representing the ASCII value of the 'delimiter' attribute. If unsuccessful, returns a `PyResult` containing an error message.
///
/// # Errors
///
/// This function can return the following errors:
///
/// * If the 'delimiter' attribute is not a single-character string, a type error is returned.
/// * If the 'obj' is not of string type and does not have a 'delimiter' attribute, a type error is returned.
fn parse_delimiter_from_obj(vm: &VirtualMachine, obj: &PyObject) -> PyResult<u8> {
if let Ok(attr) = obj.get_attr("delimiter", vm) {
parse_delimiter_from_obj(vm, &attr)
} else {
match_class!(match obj.to_owned() {
s @ PyStr => {
Ok(s.as_bytes().iter().copied().exactly_one().map_err(|_| {
vm.new_type_error(format!(
r#""delimiter" must be a unicode character, not a string of length {}"#,
s.len()
))
})?)
}
attr => {
Err(vm.new_type_error(format!(
r#""delimiter" must be a unicode character, not {}"#,
attr.class().name()
)))
}
})
}
}
fn parse_quotechar_from_obj(vm: &VirtualMachine, obj: &PyObject) -> PyResult<Option<u8>> {
match_class!(match obj.get_attr("quotechar", vm)? {
s @ PyStr => {
Ok(Some(s.as_bytes().iter().copied().exactly_one().map_err(|_| {
new_csv_error(vm, format!(r#""quotechar" must be a unicode character or None, not a string of length {}"#, s.len()))
})?))
}
_n @ PyNone => {
Ok(None)
}
attr => {
Err(new_csv_error(
vm,
format!(
r#""quotechar" must be a unicode character or None, not {}"#,
attr.class().name()
),
))
}
})
}
fn parse_escapechar_from_obj(vm: &VirtualMachine, obj: &PyObject) -> PyResult<Option<u8>> {
match_class!(match obj.get_attr("escapechar", vm)? {
s @ PyStr => {
Ok(Some(s.as_bytes().iter().copied().exactly_one().map_err(|_| {
new_csv_error(
vm,
format!(r#""escapechar" must be a unicode character or None, not a string of length {}"#, s.len()),
)
})?))
}
_n @ PyNone => {
Ok(None)
}
attr => {
Err(vm.new_type_error(format!(
r#""escapechar" must be a unicode character or None, not {}"#,
attr.class().name()
)))
}
})
}
fn prase_lineterminator_from_obj(vm: &VirtualMachine, obj: &PyObject) -> PyResult<Terminator> {
match_class!(match obj.get_attr("lineterminator", vm)? {
s @ PyStr => {
Ok(if s.as_bytes().eq(b"\r\n") {
csv_core::Terminator::CRLF
} else if let Some(t) = s.as_bytes().first() {
// Due to limitations in the current implementation within csv_core
// the support for multiple characters in lineterminator is not complete.
// only capture the first character
csv_core::Terminator::Any(*t)
} else {
return Err(new_csv_error(vm, r#""lineterminator" must be a string"#));
})
}
attr => {
Err(vm.new_type_error(format!(
r#""lineterminator" must be a string, not {}"#,
attr.class().name()
)))
}
})
}
fn prase_quoting_from_obj(vm: &VirtualMachine, obj: &PyObject) -> PyResult<QuoteStyle> {
match_class!(match obj.get_attr("quoting", vm)? {
i @ PyInt => {
Ok(i.try_to_primitive::<isize>(vm)?
.try_into()
.map_err(|_| vm.new_type_error(r#"bad "quoting" value"#))?)
}
attr => {
Err(vm.new_type_error(format!(
r#""quoting" must be string or None, not {}"#,
attr.class().name()
)))
}
})
}
impl TryFromObject for PyDialect {
fn try_from_object(vm: &VirtualMachine, obj: PyObjectRef) -> PyResult<Self> {
let delimiter = parse_delimiter_from_obj(vm, &obj)?;
let quotechar = parse_quotechar_from_obj(vm, &obj)?;
let escapechar = parse_escapechar_from_obj(vm, &obj)?;
let doublequote = obj.get_attr("doublequote", vm)?.try_to_bool(vm)?;
let skipinitialspace = obj.get_attr("skipinitialspace", vm)?.try_to_bool(vm)?;
let lineterminator = prase_lineterminator_from_obj(vm, &obj)?;
let quoting = prase_quoting_from_obj(vm, &obj)?;
let strict = if let Ok(t) = obj.get_attr("strict", vm) {
t.try_to_bool(vm).unwrap_or(false)
} else {
false
};
Ok(Self {
delimiter,
quotechar,
escapechar,
doublequote,
skipinitialspace,
lineterminator,
quoting,
strict,
})
}
}
#[pyfunction]
fn register_dialect(
name: PyObjectRef,
dialect: OptionalArg<PyObjectRef>,
opts: FormatOptions,
// TODO: handle quote style, etc
mut _rest: FuncArgs,
vm: &VirtualMachine,
) -> PyResult<()> {
let name = name
.downcast::<PyStr>()
.map_err(|_| vm.new_type_error("argument 0 must be a string"))?;
let name: PyUtf8StrRef = name.try_into_utf8(vm)?;
let dialect = match dialect {
OptionalArg::Present(d) => PyDialect::try_from_object(vm, d)
.map_err(|_| vm.new_type_error("argument 1 must be a dialect object"))?,
OptionalArg::Missing => opts.result(vm)?,
};
let dialect = opts.update_py_dialect(dialect);
GLOBAL_HASHMAP
.lock()
.insert(name.as_str().to_owned(), dialect);
Ok(())
}
#[pyfunction]
fn get_dialect(
name: PyObjectRef,
mut _rest: FuncArgs,
vm: &VirtualMachine,
) -> PyResult<PyDialect> {
let name = name.downcast::<PyStr>().map_err(|obj| {
new_csv_error(
vm,
format!("argument 0 must be a string, not '{}'", obj.class().name()),
)
})?;
let name: PyUtf8StrRef = name.try_into_utf8(vm)?;
let g = GLOBAL_HASHMAP.lock();
if let Some(dialect) = g.get(name.as_str()) {
return Ok(*dialect);
}
Err(new_csv_error(vm, "unknown dialect"))
}
#[pyfunction]
fn unregister_dialect(
name: PyObjectRef,
mut _rest: FuncArgs,
vm: &VirtualMachine,
) -> PyResult<()> {
let name = name.downcast::<PyStr>().map_err(|obj| {
new_csv_error(
vm,
format!("argument 0 must be a string, not '{}'", obj.class().name()),
)
})?;
let name: PyUtf8StrRef = name.try_into_utf8(vm)?;
let mut g = GLOBAL_HASHMAP.lock();
if let Some(_removed) = g.remove(name.as_str()) {
return Ok(());
}
Err(new_csv_error(vm, "unknown dialect"))
}
#[pyfunction]
fn list_dialects(
rest: FuncArgs,
vm: &VirtualMachine,
) -> PyResult<rustpython_vm::builtins::PyListRef> {
if !rest.args.is_empty() || !rest.kwargs.is_empty() {
return Err(vm.new_type_error("too many argument"));
}
let g = GLOBAL_HASHMAP.lock();
let t = g
.keys()
.cloned()
.map(|x| vm.ctx.new_str(x).into())
.collect_vec();
// .iter().map(|x| vm.ctx.new_str(x.clone()).into_pyobject(vm)).collect_vec();
Ok(vm.ctx.new_list(t))
}
#[pyfunction]
fn field_size_limit(rest: FuncArgs, vm: &VirtualMachine) -> PyResult<isize> {
let old_size = GLOBAL_FIELD_LIMIT.lock().to_owned();
if !rest.args.is_empty() {
let arg_len = rest.args.len();
if arg_len != 1 {
return Err(vm.new_type_error(format!(
"field_size_limit() takes at most 1 argument ({arg_len} given)"
)));
}
let Ok(new_size) = rest.args.first().unwrap().try_int(vm) else {
return Err(vm.new_type_error("limit must be an integer"));
};
*GLOBAL_FIELD_LIMIT.lock() = new_size.try_to_primitive::<isize>(vm)?;
}
Ok(old_size)
}
#[pyfunction]
fn reader(
iter: PyIter,
options: FormatOptions,
// TODO: handle quote style, etc
_rest: FuncArgs,
vm: &VirtualMachine,
) -> PyResult<Reader> {
Ok(Reader {
iter,
state: PyMutex::new(ReadState {
buffer: vec![0; 1024],
output_ends: vec![0; 16],
reader: options.to_reader(),
skipinitialspace: options.get_skipinitialspace(),
delimiter: options.get_delimiter(),
line_num: 0,
}),
dialect: options.result(vm)?,
})
}
#[pyfunction]
fn writer(
file: PyObjectRef,
options: FormatOptions,
// TODO: handle quote style, etc
_rest: FuncArgs,
vm: &VirtualMachine,
) -> PyResult<Writer> {
let write = match vm.get_attribute_opt(file.clone(), "write")? {
Some(write_meth) => write_meth,
None if file.is_callable() => file,
None => {
return Err(vm.new_type_error(r#"argument 1 must have a "write" method"#));
}
};
Ok(Writer {
write,
state: PyMutex::new(WriteState {
buffer: vec![0; 1024],
writer: options.to_writer(),
}),
dialect: options.result(vm)?,
})
}
#[inline]
fn resize_buf<T: num_traits::PrimInt>(buf: &mut Vec<T>) {
let new_size = buf.len() * 2;
buf.resize(new_size, T::zero());
}
#[repr(i32)]
#[derive(Debug, Clone, Copy, Eq, PartialEq)]
pub enum QuoteStyle {
Minimal = 0,
All = 1,
Nonnumeric = 2,
None = 3,
Strings = 4,
Notnull = 5,
}
impl From<QuoteStyle> for csv_core::QuoteStyle {
fn from(val: QuoteStyle) -> Self {
match val {
QuoteStyle::Minimal => Self::Always,
QuoteStyle::All => Self::Always,
QuoteStyle::Nonnumeric => Self::NonNumeric,
QuoteStyle::None => Self::Never,
QuoteStyle::Strings | QuoteStyle::Notnull => Self::Necessary,
}
}
}
impl TryFromObject for QuoteStyle {
fn try_from_object(vm: &VirtualMachine, obj: PyObjectRef) -> PyResult<Self> {
let num = obj.try_int(vm)?.try_to_primitive::<isize>(vm)?;
num.try_into().map_err(|_| {
vm.new_value_error("can not convert to QuoteStyle enum from input argument")
})
}
}
impl TryFrom<isize> for QuoteStyle {
type Error = ();
fn try_from(num: isize) -> Result<Self, Self::Error> {
Ok(match num {
0 => Self::Minimal,
1 => Self::All,
2 => Self::Nonnumeric,
3 => Self::None,
4 => Self::Strings,
5 => Self::Notnull,
_ => return Err(()),
})
}
}
impl From<QuoteStyle> for isize {
fn from(val: QuoteStyle) -> Self {
match val {
QuoteStyle::Minimal => 0,
QuoteStyle::All => 1,
QuoteStyle::Nonnumeric => 2,
QuoteStyle::None => 3,
QuoteStyle::Strings => 4,
QuoteStyle::Notnull => 5,
}
}
}
#[derive(Default)]
enum DialectItem {
Str(String),
Obj(PyDialect),
#[default]
None,
}
#[derive(Default)]
struct FormatOptions {
dialect: DialectItem,
delimiter: Option<u8>,
quotechar: Option<Option<u8>>,
escapechar: Option<u8>,
doublequote: Option<bool>,
skipinitialspace: Option<bool>,
lineterminator: Option<csv_core::Terminator>,
quoting: Option<QuoteStyle>,
strict: Option<bool>,
}
/// prase a dialect item from a Python argument and returns a `DialectItem` or an `ArgumentError`.
///
/// This function takes a reference to the VirtualMachine and a PyObjectRef as input and attempts to parse a dialect item from the provided Python argument. It returns a `DialectItem` if successful, or an `ArgumentError` if unsuccessful.
///
/// # Arguments
///
/// * `vm` - A reference to the VirtualMachine, used for executing Python code and manipulating Python objects.
/// * `obj` - The PyObjectRef from which the dialect item is to be parsed.
///
/// # Returns
///
/// If successful, returns a `Result<DialectItem, ArgumentError>` representing the parsed dialect item. If unsuccessful, returns an `ArgumentError`.
///
/// # Errors
///
/// This function can return the following errors:
///
/// * If the provided object is a PyStr, it returns a `DialectItem::Str` containing the string value.
/// * If the provided object is PyNone, it returns an `ArgumentError` with the message "InvalidKeywordArgument('dialect')".
/// * If the provided object is a PyType, it attempts to create a PyDialect from the object and returns a `DialectItem::Obj` containing the PyDialect if successful. If unsuccessful, it returns an `ArgumentError` with the message "InvalidKeywordArgument('dialect')".
/// * If the provided object is none of the above types, it attempts to create a PyDialect from the object and returns a `DialectItem::Obj` containing the PyDialect if successful. If unsuccessful, it returns an `ArgumentError` with the message "InvalidKeywordArgument('dialect')".
fn prase_dialect_item_from_arg(
vm: &VirtualMachine,
obj: PyObjectRef,
) -> Result<DialectItem, ArgumentError> {
match_class!(match obj {
s @ PyStr => {
let s = s.try_into_utf8(vm).map_err(ArgumentError::Exception)?;
Ok(DialectItem::Str(s.as_str().to_owned()))
}
PyNone => {
Err(ArgumentError::InvalidKeywordArgument("dialect".to_string()))
}
t @ PyType => {
let temp = t
.as_object()
.call(vec![], vm)
.map_err(|_e| ArgumentError::InvalidKeywordArgument("dialect".to_string()))?;
Ok(DialectItem::Obj(
PyDialect::try_from_object(vm, temp).map_err(|_| {
ArgumentError::InvalidKeywordArgument("dialect".to_string())
})?,
))
}
obj => {
if let Ok(cur_dialect_item) = PyDialect::try_from_object(vm, obj) {
Ok(DialectItem::Obj(cur_dialect_item))
} else {
Err(ArgumentError::InvalidKeywordArgument("dialect".to_string()))
}
}
})
}
impl FromArgs for FormatOptions {
fn from_args(vm: &VirtualMachine, args: &mut FuncArgs) -> Result<Self, ArgumentError> {
let dialect = if let Some(dialect) = args.kwargs.swap_remove("dialect") {
prase_dialect_item_from_arg(vm, dialect)?
} else if let Some(dialect) = args.args.first() {
prase_dialect_item_from_arg(vm, dialect.clone())?
} else {
DialectItem::None
};
let mut res = Self {
dialect,
..Default::default()
};
if let Some(delimiter) = args.kwargs.swap_remove("delimiter") {
res.delimiter = Some(parse_delimiter_from_obj(vm, &delimiter)?);
}
if let Some(escapechar) = args.kwargs.swap_remove("escapechar") {
res.escapechar = match_class!(match escapechar {
s @ PyStr =>
Some(s.as_bytes().iter().copied().exactly_one().map_err(|_| {
vm.new_type_error(r#""escapechar" must be a 1-character string"#)
})?),
_ => None,
})
};
if let Some(lineterminator) = args.kwargs.swap_remove("lineterminator") {
res.lineterminator = Some(csv_core::Terminator::Any(
lineterminator
.try_to_value::<&str>(vm)?
.bytes()
.exactly_one()
.map_err(|_| {
vm.new_type_error(r#""lineterminator" must be a 1-character string"#)
})?,
))
};
if let Some(doublequote) = args.kwargs.swap_remove("doublequote") {
res.doublequote = Some(
doublequote
.try_to_bool(vm)
.map_err(|_| vm.new_type_error(r#""doublequote" must be a bool"#))?,
)
};
if let Some(skipinitialspace) = args.kwargs.swap_remove("skipinitialspace") {
res.skipinitialspace = Some(
skipinitialspace
.try_to_bool(vm)
.map_err(|_| vm.new_type_error(r#""skipinitialspace" must be a bool"#))?,
)
};
if let Some(quoting) = args.kwargs.swap_remove("quoting") {
res.quoting = match_class!(match quoting {
i @ PyInt =>
Some(i.try_to_primitive::<isize>(vm)?.try_into().map_err(|_e| {
ArgumentError::InvalidKeywordArgument("quoting".to_string())
})?),
_ => {
// let msg = r#""quoting" must be a int enum"#;
return Err(ArgumentError::InvalidKeywordArgument("quoting".to_string()));
}
});
};
if let Some(quotechar) = args.kwargs.swap_remove("quotechar") {
res.quotechar = match_class!(match quotechar {
s @ PyStr => Some(Some(s.as_bytes().iter().copied().exactly_one().map_err(
|_| { vm.new_type_error(r#""quotechar" must be a 1-character string"#) }
)?)),
PyNone => {
if res
.quoting
.is_some_and(|quoting| quoting != QuoteStyle::None)
{
return Err(ArgumentError::Exception(
vm.new_type_error("quotechar must be set if quoting enabled"),
));
}
Some(None)
}
_o => {
return Err(
rustpython_vm::function::ArgumentError::InvalidKeywordArgument(
"quotechar".to_string(),
),
);
}
})
};
if let Some(strict) = args.kwargs.swap_remove("strict") {
res.strict = Some(
strict
.try_to_bool(vm)
.map_err(|_| vm.new_type_error(r#""strict" must be a int enum"#))?,
)
};
if let Some(last_arg) = args.kwargs.pop() {
return Err(
rustpython_vm::function::ArgumentError::InvalidKeywordArgument(format!(
"'{}' is an invalid keyword argument for this function",
last_arg.0
)),
);
}
Ok(res)
}
}
impl FormatOptions {
const fn update_py_dialect(&self, mut res: PyDialect) -> PyDialect {
macro_rules! check_and_fill {
($res:ident, $e:ident) => {{
if let Some(t) = self.$e {
$res.$e = t;
}
}};
}
check_and_fill!(res, delimiter);
// check_and_fill!(res, quotechar);
check_and_fill!(res, delimiter);
check_and_fill!(res, doublequote);
check_and_fill!(res, skipinitialspace);
if let Some(t) = self.escapechar {
res.escapechar = Some(t);
};
if let Some(t) = self.quotechar {
res.quotechar = t;
};
check_and_fill!(res, quoting);
check_and_fill!(res, lineterminator);
check_and_fill!(res, strict);
res
}
fn result(&self, vm: &VirtualMachine) -> PyResult<PyDialect> {
match &self.dialect {
DialectItem::Str(name) => {
let g = GLOBAL_HASHMAP.lock();
if let Some(dialect) = g.get(name) {
Ok(self.update_py_dialect(*dialect))
} else {
Err(new_csv_error(vm, format!("{name} is not registered.")))
}
// TODO: Maybe need to update the obj from HashMap
}
DialectItem::Obj(o) => Ok(self.update_py_dialect(*o)),
DialectItem::None => {
let g = GLOBAL_HASHMAP.lock();
let res = *g.get("excel").unwrap();
Ok(self.update_py_dialect(res))
}
}
}
fn get_skipinitialspace(&self) -> bool {
let mut skipinitialspace = match &self.dialect {
DialectItem::Str(name) => {
let g = GLOBAL_HASHMAP.lock();
if let Some(dialect) = g.get(name) {
dialect.skipinitialspace
// TODO: RUSTPYTHON; Perfecting the remaining attributes.
} else {
false
}
}
DialectItem::Obj(obj) => obj.skipinitialspace,
_ => false,
};
if let Some(attr) = self.skipinitialspace {
skipinitialspace = attr
}
skipinitialspace
}
fn get_delimiter(&self) -> u8 {
let mut delimiter = match &self.dialect {
DialectItem::Str(name) => {
let g = GLOBAL_HASHMAP.lock();
if let Some(dialect) = g.get(name) {
dialect.delimiter
// RustPython todo
// todo! Perfecting the remaining attributes.
} else {
b','
}
}
DialectItem::Obj(obj) => obj.delimiter,
_ => b',',
};
if let Some(attr) = self.delimiter {
delimiter = attr
}
delimiter
}
fn to_reader(&self) -> csv_core::Reader {
let mut builder = csv_core::ReaderBuilder::new();
let mut reader = match &self.dialect {
DialectItem::Str(name) => {
let g = GLOBAL_HASHMAP.lock();
if let Some(dialect) = g.get(name) {
let mut builder = builder
.delimiter(dialect.delimiter)
.double_quote(dialect.doublequote);
if let Some(t) = dialect.quotechar {
builder = builder.quote(t);
}
builder
// RustPython todo
// todo! Perfecting the remaining attributes.
} else {
&mut builder
}
}
DialectItem::Obj(obj) => {
let mut builder = builder
.delimiter(obj.delimiter)
.double_quote(obj.doublequote);
if let Some(t) = obj.quotechar {
builder = builder.quote(t);
}
builder
}
_ => {
let name = "excel";
let g = GLOBAL_HASHMAP.lock();
let dialect = g.get(name).unwrap();
let mut builder = builder
.delimiter(dialect.delimiter)
.double_quote(dialect.doublequote);
if let Some(quotechar) = dialect.quotechar {
builder = builder.quote(quotechar);
}
builder
}
};
if let Some(t) = self.delimiter {
reader = reader.delimiter(t);
}
if let Some(t) = self.quotechar {
reader = if let Some(u) = t {
reader.quote(u)
} else {
reader.quoting(false)
}
} else {
reader = reader.quoting(self.quoting != Some(QuoteStyle::None));
}
if let Some(t) = self.lineterminator {
reader = reader.terminator(t);
}
if let Some(t) = self.doublequote {
reader = reader.double_quote(t);
}
if self.escapechar.is_some() {
reader = reader.escape(self.escapechar);
}
reader = reader.terminator(self.lineterminator.unwrap_or(Terminator::CRLF));
reader.build()
}
fn to_writer(&self) -> csv_core::Writer {
let mut builder = csv_core::WriterBuilder::new();
let mut writer = match &self.dialect {
DialectItem::Str(name) => {
let g = GLOBAL_HASHMAP.lock();
if let Some(dialect) = g.get(name) {
let mut builder = builder
.delimiter(dialect.delimiter)
.double_quote(dialect.doublequote)
.terminator(dialect.lineterminator);
if let Some(t) = dialect.quotechar {
builder = builder.quote(t);
}
builder
// TODO: RUSTPYTHON; Perfecting the remaining attributes.
} else {
&mut builder
}
}
DialectItem::Obj(obj) => {
let mut builder = builder
.delimiter(obj.delimiter)
.double_quote(obj.doublequote)
.terminator(obj.lineterminator);
if let Some(t) = obj.quotechar {
builder = builder.quote(t);
}
builder
}
_ => &mut builder,
};
if let Some(t) = self.delimiter {
writer = writer.delimiter(t);
}
if let Some(Some(t)) = self.quotechar {
writer = writer.quote(t);
}
if let Some(t) = self.doublequote {
writer = writer.double_quote(t);
}
writer = writer.terminator(self.lineterminator.unwrap_or(Terminator::CRLF));
if let Some(e) = self.escapechar {
writer = writer.escape(e);
}
if let Some(e) = self.quoting {
writer = writer.quote_style(e.into());
}
writer.build()
}
}
struct ReadState {
buffer: Vec<u8>,
output_ends: Vec<usize>,
reader: csv_core::Reader,
skipinitialspace: bool,
delimiter: u8,
line_num: u64,
}
#[pyclass(no_attr, module = "_csv", name = "reader", traverse)]
#[derive(PyPayload)]
pub(super) struct Reader {
iter: PyIter,
#[pytraverse(skip)]
state: PyMutex<ReadState>,
#[pytraverse(skip)]
dialect: PyDialect,
}
impl fmt::Debug for Reader {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "_csv.reader")
}
}
#[pyclass(with(IterNext, Iterable), flags(DISALLOW_INSTANTIATION))]
impl Reader {
#[pygetset]
fn line_num(&self) -> u64 {
self.state.lock().line_num
}
#[pygetset]
const fn dialect(&self, _vm: &VirtualMachine) -> PyDialect {
self.dialect
}
}
impl SelfIter for Reader {}
impl IterNext for Reader {
fn next(zelf: &Py<Self>, vm: &VirtualMachine) -> PyResult<PyIterReturn> {
let string = raise_if_stop!(zelf.iter.next(vm)?);
let string = string.downcast::<PyStr>().map_err(|obj| {
new_csv_error(
vm,
format!(
"iterator should return strings, not {} (the file should be opened in text mode)",
obj.class().name()
),
)
})?;
let input = string.as_bytes();
if input.is_empty() || input.starts_with(b"\n") {
return Ok(PyIterReturn::Return(vm.ctx.new_list(vec![]).into()));
}
let mut state = zelf.state.lock();
let ReadState {
buffer,
output_ends,
reader,
skipinitialspace,
delimiter,
line_num,
} = &mut *state;