aboutsummaryrefslogtreecommitdiff
path: root/vendor/serde_json/src/ser.rs
diff options
context:
space:
mode:
Diffstat (limited to 'vendor/serde_json/src/ser.rs')
-rw-r--r--vendor/serde_json/src/ser.rs2247
1 files changed, 2247 insertions, 0 deletions
diff --git a/vendor/serde_json/src/ser.rs b/vendor/serde_json/src/ser.rs
new file mode 100644
index 0000000..3742e0b
--- /dev/null
+++ b/vendor/serde_json/src/ser.rs
@@ -0,0 +1,2247 @@
+//! Serialize a Rust data structure into JSON data.
+
+use crate::error::{Error, ErrorCode, Result};
+use crate::io;
+use alloc::string::{String, ToString};
+use alloc::vec::Vec;
+use core::fmt::{self, Display};
+use core::num::FpCategory;
+use serde::ser::{self, Impossible, Serialize};
+
+/// A structure for serializing Rust values into JSON.
+#[cfg_attr(docsrs, doc(cfg(feature = "std")))]
+pub struct Serializer<W, F = CompactFormatter> {
+ writer: W,
+ formatter: F,
+}
+
+impl<W> Serializer<W>
+where
+ W: io::Write,
+{
+ /// Creates a new JSON serializer.
+ #[inline]
+ pub fn new(writer: W) -> Self {
+ Serializer::with_formatter(writer, CompactFormatter)
+ }
+}
+
+impl<'a, W> Serializer<W, PrettyFormatter<'a>>
+where
+ W: io::Write,
+{
+ /// Creates a new JSON pretty print serializer.
+ #[inline]
+ pub fn pretty(writer: W) -> Self {
+ Serializer::with_formatter(writer, PrettyFormatter::new())
+ }
+}
+
+impl<W, F> Serializer<W, F>
+where
+ W: io::Write,
+ F: Formatter,
+{
+ /// Creates a new JSON visitor whose output will be written to the writer
+ /// specified.
+ #[inline]
+ pub fn with_formatter(writer: W, formatter: F) -> Self {
+ Serializer { writer, formatter }
+ }
+
+ /// Unwrap the `Writer` from the `Serializer`.
+ #[inline]
+ pub fn into_inner(self) -> W {
+ self.writer
+ }
+}
+
+impl<'a, W, F> ser::Serializer for &'a mut Serializer<W, F>
+where
+ W: io::Write,
+ F: Formatter,
+{
+ type Ok = ();
+ type Error = Error;
+
+ type SerializeSeq = Compound<'a, W, F>;
+ type SerializeTuple = Compound<'a, W, F>;
+ type SerializeTupleStruct = Compound<'a, W, F>;
+ type SerializeTupleVariant = Compound<'a, W, F>;
+ type SerializeMap = Compound<'a, W, F>;
+ type SerializeStruct = Compound<'a, W, F>;
+ type SerializeStructVariant = Compound<'a, W, F>;
+
+ #[inline]
+ fn serialize_bool(self, value: bool) -> Result<()> {
+ self.formatter
+ .write_bool(&mut self.writer, value)
+ .map_err(Error::io)
+ }
+
+ #[inline]
+ fn serialize_i8(self, value: i8) -> Result<()> {
+ self.formatter
+ .write_i8(&mut self.writer, value)
+ .map_err(Error::io)
+ }
+
+ #[inline]
+ fn serialize_i16(self, value: i16) -> Result<()> {
+ self.formatter
+ .write_i16(&mut self.writer, value)
+ .map_err(Error::io)
+ }
+
+ #[inline]
+ fn serialize_i32(self, value: i32) -> Result<()> {
+ self.formatter
+ .write_i32(&mut self.writer, value)
+ .map_err(Error::io)
+ }
+
+ #[inline]
+ fn serialize_i64(self, value: i64) -> Result<()> {
+ self.formatter
+ .write_i64(&mut self.writer, value)
+ .map_err(Error::io)
+ }
+
+ fn serialize_i128(self, value: i128) -> Result<()> {
+ self.formatter
+ .write_i128(&mut self.writer, value)
+ .map_err(Error::io)
+ }
+
+ #[inline]
+ fn serialize_u8(self, value: u8) -> Result<()> {
+ self.formatter
+ .write_u8(&mut self.writer, value)
+ .map_err(Error::io)
+ }
+
+ #[inline]
+ fn serialize_u16(self, value: u16) -> Result<()> {
+ self.formatter
+ .write_u16(&mut self.writer, value)
+ .map_err(Error::io)
+ }
+
+ #[inline]
+ fn serialize_u32(self, value: u32) -> Result<()> {
+ self.formatter
+ .write_u32(&mut self.writer, value)
+ .map_err(Error::io)
+ }
+
+ #[inline]
+ fn serialize_u64(self, value: u64) -> Result<()> {
+ self.formatter
+ .write_u64(&mut self.writer, value)
+ .map_err(Error::io)
+ }
+
+ fn serialize_u128(self, value: u128) -> Result<()> {
+ self.formatter
+ .write_u128(&mut self.writer, value)
+ .map_err(Error::io)
+ }
+
+ #[inline]
+ fn serialize_f32(self, value: f32) -> Result<()> {
+ match value.classify() {
+ FpCategory::Nan | FpCategory::Infinite => self
+ .formatter
+ .write_null(&mut self.writer)
+ .map_err(Error::io),
+ _ => self
+ .formatter
+ .write_f32(&mut self.writer, value)
+ .map_err(Error::io),
+ }
+ }
+
+ #[inline]
+ fn serialize_f64(self, value: f64) -> Result<()> {
+ match value.classify() {
+ FpCategory::Nan | FpCategory::Infinite => self
+ .formatter
+ .write_null(&mut self.writer)
+ .map_err(Error::io),
+ _ => self
+ .formatter
+ .write_f64(&mut self.writer, value)
+ .map_err(Error::io),
+ }
+ }
+
+ #[inline]
+ fn serialize_char(self, value: char) -> Result<()> {
+ // A char encoded as UTF-8 takes 4 bytes at most.
+ let mut buf = [0; 4];
+ self.serialize_str(value.encode_utf8(&mut buf))
+ }
+
+ #[inline]
+ fn serialize_str(self, value: &str) -> Result<()> {
+ format_escaped_str(&mut self.writer, &mut self.formatter, value).map_err(Error::io)
+ }
+
+ #[inline]
+ fn serialize_bytes(self, value: &[u8]) -> Result<()> {
+ self.formatter
+ .write_byte_array(&mut self.writer, value)
+ .map_err(Error::io)
+ }
+
+ #[inline]
+ fn serialize_unit(self) -> Result<()> {
+ self.formatter
+ .write_null(&mut self.writer)
+ .map_err(Error::io)
+ }
+
+ #[inline]
+ fn serialize_unit_struct(self, _name: &'static str) -> Result<()> {
+ self.serialize_unit()
+ }
+
+ #[inline]
+ fn serialize_unit_variant(
+ self,
+ _name: &'static str,
+ _variant_index: u32,
+ variant: &'static str,
+ ) -> Result<()> {
+ self.serialize_str(variant)
+ }
+
+ /// Serialize newtypes without an object wrapper.
+ #[inline]
+ fn serialize_newtype_struct<T>(self, _name: &'static str, value: &T) -> Result<()>
+ where
+ T: ?Sized + Serialize,
+ {
+ value.serialize(self)
+ }
+
+ #[inline]
+ fn serialize_newtype_variant<T>(
+ self,
+ _name: &'static str,
+ _variant_index: u32,
+ variant: &'static str,
+ value: &T,
+ ) -> Result<()>
+ where
+ T: ?Sized + Serialize,
+ {
+ tri!(self
+ .formatter
+ .begin_object(&mut self.writer)
+ .map_err(Error::io));
+ tri!(self
+ .formatter
+ .begin_object_key(&mut self.writer, true)
+ .map_err(Error::io));
+ tri!(self.serialize_str(variant));
+ tri!(self
+ .formatter
+ .end_object_key(&mut self.writer)
+ .map_err(Error::io));
+ tri!(self
+ .formatter
+ .begin_object_value(&mut self.writer)
+ .map_err(Error::io));
+ tri!(value.serialize(&mut *self));
+ tri!(self
+ .formatter
+ .end_object_value(&mut self.writer)
+ .map_err(Error::io));
+ self.formatter
+ .end_object(&mut self.writer)
+ .map_err(Error::io)
+ }
+
+ #[inline]
+ fn serialize_none(self) -> Result<()> {
+ self.serialize_unit()
+ }
+
+ #[inline]
+ fn serialize_some<T>(self, value: &T) -> Result<()>
+ where
+ T: ?Sized + Serialize,
+ {
+ value.serialize(self)
+ }
+
+ #[inline]
+ fn serialize_seq(self, len: Option<usize>) -> Result<Self::SerializeSeq> {
+ tri!(self
+ .formatter
+ .begin_array(&mut self.writer)
+ .map_err(Error::io));
+ if len == Some(0) {
+ tri!(self
+ .formatter
+ .end_array(&mut self.writer)
+ .map_err(Error::io));
+ Ok(Compound::Map {
+ ser: self,
+ state: State::Empty,
+ })
+ } else {
+ Ok(Compound::Map {
+ ser: self,
+ state: State::First,
+ })
+ }
+ }
+
+ #[inline]
+ fn serialize_tuple(self, len: usize) -> Result<Self::SerializeTuple> {
+ self.serialize_seq(Some(len))
+ }
+
+ #[inline]
+ fn serialize_tuple_struct(
+ self,
+ _name: &'static str,
+ len: usize,
+ ) -> Result<Self::SerializeTupleStruct> {
+ self.serialize_seq(Some(len))
+ }
+
+ #[inline]
+ fn serialize_tuple_variant(
+ self,
+ _name: &'static str,
+ _variant_index: u32,
+ variant: &'static str,
+ len: usize,
+ ) -> Result<Self::SerializeTupleVariant> {
+ tri!(self
+ .formatter
+ .begin_object(&mut self.writer)
+ .map_err(Error::io));
+ tri!(self
+ .formatter
+ .begin_object_key(&mut self.writer, true)
+ .map_err(Error::io));
+ tri!(self.serialize_str(variant));
+ tri!(self
+ .formatter
+ .end_object_key(&mut self.writer)
+ .map_err(Error::io));
+ tri!(self
+ .formatter
+ .begin_object_value(&mut self.writer)
+ .map_err(Error::io));
+ self.serialize_seq(Some(len))
+ }
+
+ #[inline]
+ fn serialize_map(self, len: Option<usize>) -> Result<Self::SerializeMap> {
+ tri!(self
+ .formatter
+ .begin_object(&mut self.writer)
+ .map_err(Error::io));
+ if len == Some(0) {
+ tri!(self
+ .formatter
+ .end_object(&mut self.writer)
+ .map_err(Error::io));
+ Ok(Compound::Map {
+ ser: self,
+ state: State::Empty,
+ })
+ } else {
+ Ok(Compound::Map {
+ ser: self,
+ state: State::First,
+ })
+ }
+ }
+
+ #[inline]
+ fn serialize_struct(self, name: &'static str, len: usize) -> Result<Self::SerializeStruct> {
+ match name {
+ #[cfg(feature = "arbitrary_precision")]
+ crate::number::TOKEN => Ok(Compound::Number { ser: self }),
+ #[cfg(feature = "raw_value")]
+ crate::raw::TOKEN => Ok(Compound::RawValue { ser: self }),
+ _ => self.serialize_map(Some(len)),
+ }
+ }
+
+ #[inline]
+ fn serialize_struct_variant(
+ self,
+ _name: &'static str,
+ _variant_index: u32,
+ variant: &'static str,
+ len: usize,
+ ) -> Result<Self::SerializeStructVariant> {
+ tri!(self
+ .formatter
+ .begin_object(&mut self.writer)
+ .map_err(Error::io));
+ tri!(self
+ .formatter
+ .begin_object_key(&mut self.writer, true)
+ .map_err(Error::io));
+ tri!(self.serialize_str(variant));
+ tri!(self
+ .formatter
+ .end_object_key(&mut self.writer)
+ .map_err(Error::io));
+ tri!(self
+ .formatter
+ .begin_object_value(&mut self.writer)
+ .map_err(Error::io));
+ self.serialize_map(Some(len))
+ }
+
+ fn collect_str<T>(self, value: &T) -> Result<()>
+ where
+ T: ?Sized + Display,
+ {
+ use self::fmt::Write;
+
+ struct Adapter<'ser, W: 'ser, F: 'ser> {
+ writer: &'ser mut W,
+ formatter: &'ser mut F,
+ error: Option<io::Error>,
+ }
+
+ impl<'ser, W, F> Write for Adapter<'ser, W, F>
+ where
+ W: io::Write,
+ F: Formatter,
+ {
+ fn write_str(&mut self, s: &str) -> fmt::Result {
+ debug_assert!(self.error.is_none());
+ match format_escaped_str_contents(self.writer, self.formatter, s) {
+ Ok(()) => Ok(()),
+ Err(err) => {
+ self.error = Some(err);
+ Err(fmt::Error)
+ }
+ }
+ }
+ }
+
+ tri!(self
+ .formatter
+ .begin_string(&mut self.writer)
+ .map_err(Error::io));
+ let mut adapter = Adapter {
+ writer: &mut self.writer,
+ formatter: &mut self.formatter,
+ error: None,
+ };
+ match write!(adapter, "{}", value) {
+ Ok(()) => debug_assert!(adapter.error.is_none()),
+ Err(fmt::Error) => {
+ return Err(Error::io(adapter.error.expect("there should be an error")));
+ }
+ }
+ self.formatter
+ .end_string(&mut self.writer)
+ .map_err(Error::io)
+ }
+}
+
+// Not public API. Should be pub(crate).
+#[doc(hidden)]
+#[derive(Eq, PartialEq)]
+pub enum State {
+ Empty,
+ First,
+ Rest,
+}
+
+// Not public API. Should be pub(crate).
+#[doc(hidden)]
+pub enum Compound<'a, W: 'a, F: 'a> {
+ Map {
+ ser: &'a mut Serializer<W, F>,
+ state: State,
+ },
+ #[cfg(feature = "arbitrary_precision")]
+ Number { ser: &'a mut Serializer<W, F> },
+ #[cfg(feature = "raw_value")]
+ RawValue { ser: &'a mut Serializer<W, F> },
+}
+
+impl<'a, W, F> ser::SerializeSeq for Compound<'a, W, F>
+where
+ W: io::Write,
+ F: Formatter,
+{
+ type Ok = ();
+ type Error = Error;
+
+ #[inline]
+ fn serialize_element<T>(&mut self, value: &T) -> Result<()>
+ where
+ T: ?Sized + Serialize,
+ {
+ match self {
+ Compound::Map { ser, state } => {
+ tri!(ser
+ .formatter
+ .begin_array_value(&mut ser.writer, *state == State::First)
+ .map_err(Error::io));
+ *state = State::Rest;
+ tri!(value.serialize(&mut **ser));
+ ser.formatter
+ .end_array_value(&mut ser.writer)
+ .map_err(Error::io)
+ }
+ #[cfg(feature = "arbitrary_precision")]
+ Compound::Number { .. } => unreachable!(),
+ #[cfg(feature = "raw_value")]
+ Compound::RawValue { .. } => unreachable!(),
+ }
+ }
+
+ #[inline]
+ fn end(self) -> Result<()> {
+ match self {
+ Compound::Map { ser, state } => match state {
+ State::Empty => Ok(()),
+ _ => ser.formatter.end_array(&mut ser.writer).map_err(Error::io),
+ },
+ #[cfg(feature = "arbitrary_precision")]
+ Compound::Number { .. } => unreachable!(),
+ #[cfg(feature = "raw_value")]
+ Compound::RawValue { .. } => unreachable!(),
+ }
+ }
+}
+
+impl<'a, W, F> ser::SerializeTuple for Compound<'a, W, F>
+where
+ W: io::Write,
+ F: Formatter,
+{
+ type Ok = ();
+ type Error = Error;
+
+ #[inline]
+ fn serialize_element<T>(&mut self, value: &T) -> Result<()>
+ where
+ T: ?Sized + Serialize,
+ {
+ ser::SerializeSeq::serialize_element(self, value)
+ }
+
+ #[inline]
+ fn end(self) -> Result<()> {
+ ser::SerializeSeq::end(self)
+ }
+}
+
+impl<'a, W, F> ser::SerializeTupleStruct for Compound<'a, W, F>
+where
+ W: io::Write,
+ F: Formatter,
+{
+ type Ok = ();
+ type Error = Error;
+
+ #[inline]
+ fn serialize_field<T>(&mut self, value: &T) -> Result<()>
+ where
+ T: ?Sized + Serialize,
+ {
+ ser::SerializeSeq::serialize_element(self, value)
+ }
+
+ #[inline]
+ fn end(self) -> Result<()> {
+ ser::SerializeSeq::end(self)
+ }
+}
+
+impl<'a, W, F> ser::SerializeTupleVariant for Compound<'a, W, F>
+where
+ W: io::Write,
+ F: Formatter,
+{
+ type Ok = ();
+ type Error = Error;
+
+ #[inline]
+ fn serialize_field<T>(&mut self, value: &T) -> Result<()>
+ where
+ T: ?Sized + Serialize,
+ {
+ ser::SerializeSeq::serialize_element(self, value)
+ }
+
+ #[inline]
+ fn end(self) -> Result<()> {
+ match self {
+ Compound::Map { ser, state } => {
+ match state {
+ State::Empty => {}
+ _ => tri!(ser.formatter.end_array(&mut ser.writer).map_err(Error::io)),
+ }
+ tri!(ser
+ .formatter
+ .end_object_value(&mut ser.writer)
+ .map_err(Error::io));
+ ser.formatter.end_object(&mut ser.writer).map_err(Error::io)
+ }
+ #[cfg(feature = "arbitrary_precision")]
+ Compound::Number { .. } => unreachable!(),
+ #[cfg(feature = "raw_value")]
+ Compound::RawValue { .. } => unreachable!(),
+ }
+ }
+}
+
+impl<'a, W, F> ser::SerializeMap for Compound<'a, W, F>
+where
+ W: io::Write,
+ F: Formatter,
+{
+ type Ok = ();
+ type Error = Error;
+
+ #[inline]
+ fn serialize_key<T>(&mut self, key: &T) -> Result<()>
+ where
+ T: ?Sized + Serialize,
+ {
+ match self {
+ Compound::Map { ser, state } => {
+ tri!(ser
+ .formatter
+ .begin_object_key(&mut ser.writer, *state == State::First)
+ .map_err(Error::io));
+ *state = State::Rest;
+
+ tri!(key.serialize(MapKeySerializer { ser: *ser }));
+
+ ser.formatter
+ .end_object_key(&mut ser.writer)
+ .map_err(Error::io)
+ }
+ #[cfg(feature = "arbitrary_precision")]
+ Compound::Number { .. } => unreachable!(),
+ #[cfg(feature = "raw_value")]
+ Compound::RawValue { .. } => unreachable!(),
+ }
+ }
+
+ #[inline]
+ fn serialize_value<T>(&mut self, value: &T) -> Result<()>
+ where
+ T: ?Sized + Serialize,
+ {
+ match self {
+ Compound::Map { ser, .. } => {
+ tri!(ser
+ .formatter
+ .begin_object_value(&mut ser.writer)
+ .map_err(Error::io));
+ tri!(value.serialize(&mut **ser));
+ ser.formatter
+ .end_object_value(&mut ser.writer)
+ .map_err(Error::io)
+ }
+ #[cfg(feature = "arbitrary_precision")]
+ Compound::Number { .. } => unreachable!(),
+ #[cfg(feature = "raw_value")]
+ Compound::RawValue { .. } => unreachable!(),
+ }
+ }
+
+ #[inline]
+ fn end(self) -> Result<()> {
+ match self {
+ Compound::Map { ser, state } => match state {
+ State::Empty => Ok(()),
+ _ => ser.formatter.end_object(&mut ser.writer).map_err(Error::io),
+ },
+ #[cfg(feature = "arbitrary_precision")]
+ Compound::Number { .. } => unreachable!(),
+ #[cfg(feature = "raw_value")]
+ Compound::RawValue { .. } => unreachable!(),
+ }
+ }
+}
+
+impl<'a, W, F> ser::SerializeStruct for Compound<'a, W, F>
+where
+ W: io::Write,
+ F: Formatter,
+{
+ type Ok = ();
+ type Error = Error;
+
+ #[inline]
+ fn serialize_field<T>(&mut self, key: &'static str, value: &T) -> Result<()>
+ where
+ T: ?Sized + Serialize,
+ {
+ match self {
+ Compound::Map { .. } => ser::SerializeMap::serialize_entry(self, key, value),
+ #[cfg(feature = "arbitrary_precision")]
+ Compound::Number { ser, .. } => {
+ if key == crate::number::TOKEN {
+ value.serialize(NumberStrEmitter(ser))
+ } else {
+ Err(invalid_number())
+ }
+ }
+ #[cfg(feature = "raw_value")]
+ Compound::RawValue { ser, .. } => {
+ if key == crate::raw::TOKEN {
+ value.serialize(RawValueStrEmitter(ser))
+ } else {
+ Err(invalid_raw_value())
+ }
+ }
+ }
+ }
+
+ #[inline]
+ fn end(self) -> Result<()> {
+ match self {
+ Compound::Map { .. } => ser::SerializeMap::end(self),
+ #[cfg(feature = "arbitrary_precision")]
+ Compound::Number { .. } => Ok(()),
+ #[cfg(feature = "raw_value")]
+ Compound::RawValue { .. } => Ok(()),
+ }
+ }
+}
+
+impl<'a, W, F> ser::SerializeStructVariant for Compound<'a, W, F>
+where
+ W: io::Write,
+ F: Formatter,
+{
+ type Ok = ();
+ type Error = Error;
+
+ #[inline]
+ fn serialize_field<T>(&mut self, key: &'static str, value: &T) -> Result<()>
+ where
+ T: ?Sized + Serialize,
+ {
+ match *self {
+ Compound::Map { .. } => ser::SerializeStruct::serialize_field(self, key, value),
+ #[cfg(feature = "arbitrary_precision")]
+ Compound::Number { .. } => unreachable!(),
+ #[cfg(feature = "raw_value")]
+ Compound::RawValue { .. } => unreachable!(),
+ }
+ }
+
+ #[inline]
+ fn end(self) -> Result<()> {
+ match self {
+ Compound::Map { ser, state } => {
+ match state {
+ State::Empty => {}
+ _ => tri!(ser.formatter.end_object(&mut ser.writer).map_err(Error::io)),
+ }
+ tri!(ser
+ .formatter
+ .end_object_value(&mut ser.writer)
+ .map_err(Error::io));
+ ser.formatter.end_object(&mut ser.writer).map_err(Error::io)
+ }
+ #[cfg(feature = "arbitrary_precision")]
+ Compound::Number { .. } => unreachable!(),
+ #[cfg(feature = "raw_value")]
+ Compound::RawValue { .. } => unreachable!(),
+ }
+ }
+}
+
+struct MapKeySerializer<'a, W: 'a, F: 'a> {
+ ser: &'a mut Serializer<W, F>,
+}
+
+#[cfg(feature = "arbitrary_precision")]
+fn invalid_number() -> Error {
+ Error::syntax(ErrorCode::InvalidNumber, 0, 0)
+}
+
+#[cfg(feature = "raw_value")]
+fn invalid_raw_value() -> Error {
+ Error::syntax(ErrorCode::ExpectedSomeValue, 0, 0)
+}
+
+fn key_must_be_a_string() -> Error {
+ Error::syntax(ErrorCode::KeyMustBeAString, 0, 0)
+}
+
+fn float_key_must_be_finite() -> Error {
+ Error::syntax(ErrorCode::FloatKeyMustBeFinite, 0, 0)
+}
+
+impl<'a, W, F> ser::Serializer for MapKeySerializer<'a, W, F>
+where
+ W: io::Write,
+ F: Formatter,
+{
+ type Ok = ();
+ type Error = Error;
+
+ #[inline]
+ fn serialize_str(self, value: &str) -> Result<()> {
+ self.ser.serialize_str(value)
+ }
+
+ #[inline]
+ fn serialize_unit_variant(
+ self,
+ _name: &'static str,
+ _variant_index: u32,
+ variant: &'static str,
+ ) -> Result<()> {
+ self.ser.serialize_str(variant)
+ }
+
+ #[inline]
+ fn serialize_newtype_struct<T>(self, _name: &'static str, value: &T) -> Result<()>
+ where
+ T: ?Sized + Serialize,
+ {
+ value.serialize(self)
+ }
+
+ type SerializeSeq = Impossible<(), Error>;
+ type SerializeTuple = Impossible<(), Error>;
+ type SerializeTupleStruct = Impossible<(), Error>;
+ type SerializeTupleVariant = Impossible<(), Error>;
+ type SerializeMap = Impossible<(), Error>;
+ type SerializeStruct = Impossible<(), Error>;
+ type SerializeStructVariant = Impossible<(), Error>;
+
+ fn serialize_bool(self, value: bool) -> Result<()> {
+ tri!(self
+ .ser
+ .formatter
+ .begin_string(&mut self.ser.writer)
+ .map_err(Error::io));
+ tri!(self
+ .ser
+ .formatter
+ .write_bool(&mut self.ser.writer, value)
+ .map_err(Error::io));
+ self.ser
+ .formatter
+ .end_string(&mut self.ser.writer)
+ .map_err(Error::io)
+ }
+
+ fn serialize_i8(self, value: i8) -> Result<()> {
+ tri!(self
+ .ser
+ .formatter
+ .begin_string(&mut self.ser.writer)
+ .map_err(Error::io));
+ tri!(self
+ .ser
+ .formatter
+ .write_i8(&mut self.ser.writer, value)
+ .map_err(Error::io));
+ self.ser
+ .formatter
+ .end_string(&mut self.ser.writer)
+ .map_err(Error::io)
+ }
+
+ fn serialize_i16(self, value: i16) -> Result<()> {
+ tri!(self
+ .ser
+ .formatter
+ .begin_string(&mut self.ser.writer)
+ .map_err(Error::io));
+ tri!(self
+ .ser
+ .formatter
+ .write_i16(&mut self.ser.writer, value)
+ .map_err(Error::io));
+ self.ser
+ .formatter
+ .end_string(&mut self.ser.writer)
+ .map_err(Error::io)
+ }
+
+ fn serialize_i32(self, value: i32) -> Result<()> {
+ tri!(self
+ .ser
+ .formatter
+ .begin_string(&mut self.ser.writer)
+ .map_err(Error::io));
+ tri!(self
+ .ser
+ .formatter
+ .write_i32(&mut self.ser.writer, value)
+ .map_err(Error::io));
+ self.ser
+ .formatter
+ .end_string(&mut self.ser.writer)
+ .map_err(Error::io)
+ }
+
+ fn serialize_i64(self, value: i64) -> Result<()> {
+ tri!(self
+ .ser
+ .formatter
+ .begin_string(&mut self.ser.writer)
+ .map_err(Error::io));
+ tri!(self
+ .ser
+ .formatter
+ .write_i64(&mut self.ser.writer, value)
+ .map_err(Error::io));
+ self.ser
+ .formatter
+ .end_string(&mut self.ser.writer)
+ .map_err(Error::io)
+ }
+
+ fn serialize_i128(self, value: i128) -> Result<()> {
+ tri!(self
+ .ser
+ .formatter
+ .begin_string(&mut self.ser.writer)
+ .map_err(Error::io));
+ tri!(self
+ .ser
+ .formatter
+ .write_i128(&mut self.ser.writer, value)
+ .map_err(Error::io));
+ self.ser
+ .formatter
+ .end_string(&mut self.ser.writer)
+ .map_err(Error::io)
+ }
+
+ fn serialize_u8(self, value: u8) -> Result<()> {
+ tri!(self
+ .ser
+ .formatter
+ .begin_string(&mut self.ser.writer)
+ .map_err(Error::io));
+ tri!(self
+ .ser
+ .formatter
+ .write_u8(&mut self.ser.writer, value)
+ .map_err(Error::io));
+ self.ser
+ .formatter
+ .end_string(&mut self.ser.writer)
+ .map_err(Error::io)
+ }
+
+ fn serialize_u16(self, value: u16) -> Result<()> {
+ tri!(self
+ .ser
+ .formatter
+ .begin_string(&mut self.ser.writer)
+ .map_err(Error::io));
+ tri!(self
+ .ser
+ .formatter
+ .write_u16(&mut self.ser.writer, value)
+ .map_err(Error::io));
+ self.ser
+ .formatter
+ .end_string(&mut self.ser.writer)
+ .map_err(Error::io)
+ }
+
+ fn serialize_u32(self, value: u32) -> Result<()> {
+ tri!(self
+ .ser
+ .formatter
+ .begin_string(&mut self.ser.writer)
+ .map_err(Error::io));
+ tri!(self
+ .ser
+ .formatter
+ .write_u32(&mut self.ser.writer, value)
+ .map_err(Error::io));
+ self.ser
+ .formatter
+ .end_string(&mut self.ser.writer)
+ .map_err(Error::io)
+ }
+
+ fn serialize_u64(self, value: u64) -> Result<()> {
+ tri!(self
+ .ser
+ .formatter
+ .begin_string(&mut self.ser.writer)
+ .map_err(Error::io));
+ tri!(self
+ .ser
+ .formatter
+ .write_u64(&mut self.ser.writer, value)
+ .map_err(Error::io));
+ self.ser
+ .formatter
+ .end_string(&mut self.ser.writer)
+ .map_err(Error::io)
+ }
+
+ fn serialize_u128(self, value: u128) -> Result<()> {
+ tri!(self
+ .ser
+ .formatter
+ .begin_string(&mut self.ser.writer)
+ .map_err(Error::io));
+ tri!(self
+ .ser
+ .formatter
+ .write_u128(&mut self.ser.writer, value)
+ .map_err(Error::io));
+ self.ser
+ .formatter
+ .end_string(&mut self.ser.writer)
+ .map_err(Error::io)
+ }
+
+ fn serialize_f32(self, value: f32) -> Result<()> {
+ if !value.is_finite() {
+ return Err(float_key_must_be_finite());
+ }
+
+ tri!(self
+ .ser
+ .formatter
+ .begin_string(&mut self.ser.writer)
+ .map_err(Error::io));
+ tri!(self
+ .ser
+ .formatter
+ .write_f32(&mut self.ser.writer, value)
+ .map_err(Error::io));
+ self.ser
+ .formatter
+ .end_string(&mut self.ser.writer)
+ .map_err(Error::io)
+ }
+
+ fn serialize_f64(self, value: f64) -> Result<()> {
+ if !value.is_finite() {
+ return Err(float_key_must_be_finite());
+ }
+
+ tri!(self
+ .ser
+ .formatter
+ .begin_string(&mut self.ser.writer)
+ .map_err(Error::io));
+ tri!(self
+ .ser
+ .formatter
+ .write_f64(&mut self.ser.writer, value)
+ .map_err(Error::io));
+ self.ser
+ .formatter
+ .end_string(&mut self.ser.writer)
+ .map_err(Error::io)
+ }
+
+ fn serialize_char(self, value: char) -> Result<()> {
+ self.ser.serialize_str(&value.to_string())
+ }
+
+ fn serialize_bytes(self, _value: &[u8]) -> Result<()> {
+ Err(key_must_be_a_string())
+ }
+
+ fn serialize_unit(self) -> Result<()> {
+ Err(key_must_be_a_string())
+ }
+
+ fn serialize_unit_struct(self, _name: &'static str) -> Result<()> {
+ Err(key_must_be_a_string())
+ }
+
+ fn serialize_newtype_variant<T>(
+ self,
+ _name: &'static str,
+ _variant_index: u32,
+ _variant: &'static str,
+ _value: &T,
+ ) -> Result<()>
+ where
+ T: ?Sized + Serialize,
+ {
+ Err(key_must_be_a_string())
+ }
+
+ fn serialize_none(self) -> Result<()> {
+ Err(key_must_be_a_string())
+ }
+
+ fn serialize_some<T>(self, value: &T) -> Result<()>
+ where
+ T: ?Sized + Serialize,
+ {
+ value.serialize(self)
+ }
+
+ fn serialize_seq(self, _len: Option<usize>) -> Result<Self::SerializeSeq> {
+ Err(key_must_be_a_string())
+ }
+
+ fn serialize_tuple(self, _len: usize) -> Result<Self::SerializeTuple> {
+ Err(key_must_be_a_string())
+ }
+
+ fn serialize_tuple_struct(
+ self,
+ _name: &'static str,
+ _len: usize,
+ ) -> Result<Self::SerializeTupleStruct> {
+ Err(key_must_be_a_string())
+ }
+
+ fn serialize_tuple_variant(
+ self,
+ _name: &'static str,
+ _variant_index: u32,
+ _variant: &'static str,
+ _len: usize,
+ ) -> Result<Self::SerializeTupleVariant> {
+ Err(key_must_be_a_string())
+ }
+
+ fn serialize_map(self, _len: Option<usize>) -> Result<Self::SerializeMap> {
+ Err(key_must_be_a_string())
+ }
+
+ fn serialize_struct(self, _name: &'static str, _len: usize) -> Result<Self::SerializeStruct> {
+ Err(key_must_be_a_string())
+ }
+
+ fn serialize_struct_variant(
+ self,
+ _name: &'static str,
+ _variant_index: u32,
+ _variant: &'static str,
+ _len: usize,
+ ) -> Result<Self::SerializeStructVariant> {
+ Err(key_must_be_a_string())
+ }
+
+ fn collect_str<T>(self, value: &T) -> Result<()>
+ where
+ T: ?Sized + Display,
+ {
+ self.ser.collect_str(value)
+ }
+}
+
+#[cfg(feature = "arbitrary_precision")]
+struct NumberStrEmitter<'a, W: 'a + io::Write, F: 'a + Formatter>(&'a mut Serializer<W, F>);
+
+#[cfg(feature = "arbitrary_precision")]
+impl<'a, W: io::Write, F: Formatter> ser::Serializer for NumberStrEmitter<'a, W, F> {
+ type Ok = ();
+ type Error = Error;
+
+ type SerializeSeq = Impossible<(), Error>;
+ type SerializeTuple = Impossible<(), Error>;
+ type SerializeTupleStruct = Impossible<(), Error>;
+ type SerializeTupleVariant = Impossible<(), Error>;
+ type SerializeMap = Impossible<(), Error>;
+ type SerializeStruct = Impossible<(), Error>;
+ type SerializeStructVariant = Impossible<(), Error>;
+
+ fn serialize_bool(self, _v: bool) -> Result<()> {
+ Err(invalid_number())
+ }
+
+ fn serialize_i8(self, _v: i8) -> Result<()> {
+ Err(invalid_number())
+ }
+
+ fn serialize_i16(self, _v: i16) -> Result<()> {
+ Err(invalid_number())
+ }
+
+ fn serialize_i32(self, _v: i32) -> Result<()> {
+ Err(invalid_number())
+ }
+
+ fn serialize_i64(self, _v: i64) -> Result<()> {
+ Err(invalid_number())
+ }
+
+ fn serialize_i128(self, _v: i128) -> Result<()> {
+ Err(invalid_number())
+ }
+
+ fn serialize_u8(self, _v: u8) -> Result<()> {
+ Err(invalid_number())
+ }
+
+ fn serialize_u16(self, _v: u16) -> Result<()> {
+ Err(invalid_number())
+ }
+
+ fn serialize_u32(self, _v: u32) -> Result<()> {
+ Err(invalid_number())
+ }
+
+ fn serialize_u64(self, _v: u64) -> Result<()> {
+ Err(invalid_number())
+ }
+
+ fn serialize_u128(self, _v: u128) -> Result<()> {
+ Err(invalid_number())
+ }
+
+ fn serialize_f32(self, _v: f32) -> Result<()> {
+ Err(invalid_number())
+ }
+
+ fn serialize_f64(self, _v: f64) -> Result<()> {
+ Err(invalid_number())
+ }
+
+ fn serialize_char(self, _v: char) -> Result<()> {
+ Err(invalid_number())
+ }
+
+ fn serialize_str(self, value: &str) -> Result<()> {
+ let NumberStrEmitter(serializer) = self;
+ serializer
+ .formatter
+ .write_number_str(&mut serializer.writer, value)
+ .map_err(Error::io)
+ }
+
+ fn serialize_bytes(self, _value: &[u8]) -> Result<()> {
+ Err(invalid_number())
+ }
+
+ fn serialize_none(self) -> Result<()> {
+ Err(invalid_number())
+ }
+
+ fn serialize_some<T>(self, _value: &T) -> Result<()>
+ where
+ T: ?Sized + Serialize,
+ {
+ Err(invalid_number())
+ }
+
+ fn serialize_unit(self) -> Result<()> {
+ Err(invalid_number())
+ }
+
+ fn serialize_unit_struct(self, _name: &'static str) -> Result<()> {
+ Err(invalid_number())
+ }
+
+ fn serialize_unit_variant(
+ self,
+ _name: &'static str,
+ _variant_index: u32,
+ _variant: &'static str,
+ ) -> Result<()> {
+ Err(invalid_number())
+ }
+
+ fn serialize_newtype_struct<T>(self, _name: &'static str, _value: &T) -> Result<()>
+ where
+ T: ?Sized + Serialize,
+ {
+ Err(invalid_number())
+ }
+
+ fn serialize_newtype_variant<T>(
+ self,
+ _name: &'static str,
+ _variant_index: u32,
+ _variant: &'static str,
+ _value: &T,
+ ) -> Result<()>
+ where
+ T: ?Sized + Serialize,
+ {
+ Err(invalid_number())
+ }
+
+ fn serialize_seq(self, _len: Option<usize>) -> Result<Self::SerializeSeq> {
+ Err(invalid_number())
+ }
+
+ fn serialize_tuple(self, _len: usize) -> Result<Self::SerializeTuple> {
+ Err(invalid_number())
+ }
+
+ fn serialize_tuple_struct(
+ self,
+ _name: &'static str,
+ _len: usize,
+ ) -> Result<Self::SerializeTupleStruct> {
+ Err(invalid_number())
+ }
+
+ fn serialize_tuple_variant(
+ self,
+ _name: &'static str,
+ _variant_index: u32,
+ _variant: &'static str,
+ _len: usize,
+ ) -> Result<Self::SerializeTupleVariant> {
+ Err(invalid_number())
+ }
+
+ fn serialize_map(self, _len: Option<usize>) -> Result<Self::SerializeMap> {
+ Err(invalid_number())
+ }
+
+ fn serialize_struct(self, _name: &'static str, _len: usize) -> Result<Self::SerializeStruct> {
+ Err(invalid_number())
+ }
+
+ fn serialize_struct_variant(
+ self,
+ _name: &'static str,
+ _variant_index: u32,
+ _variant: &'static str,
+ _len: usize,
+ ) -> Result<Self::SerializeStructVariant> {
+ Err(invalid_number())
+ }
+}
+
+#[cfg(feature = "raw_value")]
+struct RawValueStrEmitter<'a, W: 'a + io::Write, F: 'a + Formatter>(&'a mut Serializer<W, F>);
+
+#[cfg(feature = "raw_value")]
+impl<'a, W: io::Write, F: Formatter> ser::Serializer for RawValueStrEmitter<'a, W, F> {
+ type Ok = ();
+ type Error = Error;
+
+ type SerializeSeq = Impossible<(), Error>;
+ type SerializeTuple = Impossible<(), Error>;
+ type SerializeTupleStruct = Impossible<(), Error>;
+ type SerializeTupleVariant = Impossible<(), Error>;
+ type SerializeMap = Impossible<(), Error>;
+ type SerializeStruct = Impossible<(), Error>;
+ type SerializeStructVariant = Impossible<(), Error>;
+
+ fn serialize_bool(self, _v: bool) -> Result<()> {
+ Err(ser::Error::custom("expected RawValue"))
+ }
+
+ fn serialize_i8(self, _v: i8) -> Result<()> {
+ Err(ser::Error::custom("expected RawValue"))
+ }
+
+ fn serialize_i16(self, _v: i16) -> Result<()> {
+ Err(ser::Error::custom("expected RawValue"))
+ }
+
+ fn serialize_i32(self, _v: i32) -> Result<()> {
+ Err(ser::Error::custom("expected RawValue"))
+ }
+
+ fn serialize_i64(self, _v: i64) -> Result<()> {
+ Err(ser::Error::custom("expected RawValue"))
+ }
+
+ fn serialize_i128(self, _v: i128) -> Result<()> {
+ Err(ser::Error::custom("expected RawValue"))
+ }
+
+ fn serialize_u8(self, _v: u8) -> Result<()> {
+ Err(ser::Error::custom("expected RawValue"))
+ }
+
+ fn serialize_u16(self, _v: u16) -> Result<()> {
+ Err(ser::Error::custom("expected RawValue"))
+ }
+
+ fn serialize_u32(self, _v: u32) -> Result<()> {
+ Err(ser::Error::custom("expected RawValue"))
+ }
+
+ fn serialize_u64(self, _v: u64) -> Result<()> {
+ Err(ser::Error::custom("expected RawValue"))
+ }
+
+ fn serialize_u128(self, _v: u128) -> Result<()> {
+ Err(ser::Error::custom("expected RawValue"))
+ }
+
+ fn serialize_f32(self, _v: f32) -> Result<()> {
+ Err(ser::Error::custom("expected RawValue"))
+ }
+
+ fn serialize_f64(self, _v: f64) -> Result<()> {
+ Err(ser::Error::custom("expected RawValue"))
+ }
+
+ fn serialize_char(self, _v: char) -> Result<()> {
+ Err(ser::Error::custom("expected RawValue"))
+ }
+
+ fn serialize_str(self, value: &str) -> Result<()> {
+ let RawValueStrEmitter(serializer) = self;
+ serializer
+ .formatter
+ .write_raw_fragment(&mut serializer.writer, value)
+ .map_err(Error::io)
+ }
+
+ fn serialize_bytes(self, _value: &[u8]) -> Result<()> {
+ Err(ser::Error::custom("expected RawValue"))
+ }
+
+ fn serialize_none(self) -> Result<()> {
+ Err(ser::Error::custom("expected RawValue"))
+ }
+
+ fn serialize_some<T>(self, _value: &T) -> Result<()>
+ where
+ T: ?Sized + Serialize,
+ {
+ Err(ser::Error::custom("expected RawValue"))
+ }
+
+ fn serialize_unit(self) -> Result<()> {
+ Err(ser::Error::custom("expected RawValue"))
+ }
+
+ fn serialize_unit_struct(self, _name: &'static str) -> Result<()> {
+ Err(ser::Error::custom("expected RawValue"))
+ }
+
+ fn serialize_unit_variant(
+ self,
+ _name: &'static str,
+ _variant_index: u32,
+ _variant: &'static str,
+ ) -> Result<()> {
+ Err(ser::Error::custom("expected RawValue"))
+ }
+
+ fn serialize_newtype_struct<T>(self, _name: &'static str, _value: &T) -> Result<()>
+ where
+ T: ?Sized + Serialize,
+ {
+ Err(ser::Error::custom("expected RawValue"))
+ }
+
+ fn serialize_newtype_variant<T>(
+ self,
+ _name: &'static str,
+ _variant_index: u32,
+ _variant: &'static str,
+ _value: &T,
+ ) -> Result<()>
+ where
+ T: ?Sized + Serialize,
+ {
+ Err(ser::Error::custom("expected RawValue"))
+ }
+
+ fn serialize_seq(self, _len: Option<usize>) -> Result<Self::SerializeSeq> {
+ Err(ser::Error::custom("expected RawValue"))
+ }
+
+ fn serialize_tuple(self, _len: usize) -> Result<Self::SerializeTuple> {
+ Err(ser::Error::custom("expected RawValue"))
+ }
+
+ fn serialize_tuple_struct(
+ self,
+ _name: &'static str,
+ _len: usize,
+ ) -> Result<Self::SerializeTupleStruct> {
+ Err(ser::Error::custom("expected RawValue"))
+ }
+
+ fn serialize_tuple_variant(
+ self,
+ _name: &'static str,
+ _variant_index: u32,
+ _variant: &'static str,
+ _len: usize,
+ ) -> Result<Self::SerializeTupleVariant> {
+ Err(ser::Error::custom("expected RawValue"))
+ }
+
+ fn serialize_map(self, _len: Option<usize>) -> Result<Self::SerializeMap> {
+ Err(ser::Error::custom("expected RawValue"))
+ }
+
+ fn serialize_struct(self, _name: &'static str, _len: usize) -> Result<Self::SerializeStruct> {
+ Err(ser::Error::custom("expected RawValue"))
+ }
+
+ fn serialize_struct_variant(
+ self,
+ _name: &'static str,
+ _variant_index: u32,
+ _variant: &'static str,
+ _len: usize,
+ ) -> Result<Self::SerializeStructVariant> {
+ Err(ser::Error::custom("expected RawValue"))
+ }
+
+ fn collect_str<T>(self, value: &T) -> Result<Self::Ok>
+ where
+ T: ?Sized + Display,
+ {
+ self.serialize_str(&value.to_string())
+ }
+}
+
+/// Represents a character escape code in a type-safe manner.
+pub enum CharEscape {
+ /// An escaped quote `"`
+ Quote,
+ /// An escaped reverse solidus `\`
+ ReverseSolidus,
+ /// An escaped solidus `/`
+ Solidus,
+ /// An escaped backspace character (usually escaped as `\b`)
+ Backspace,
+ /// An escaped form feed character (usually escaped as `\f`)
+ FormFeed,
+ /// An escaped line feed character (usually escaped as `\n`)
+ LineFeed,
+ /// An escaped carriage return character (usually escaped as `\r`)
+ CarriageReturn,
+ /// An escaped tab character (usually escaped as `\t`)
+ Tab,
+ /// An escaped ASCII plane control character (usually escaped as
+ /// `\u00XX` where `XX` are two hex characters)
+ AsciiControl(u8),
+}
+
+impl CharEscape {
+ #[inline]
+ fn from_escape_table(escape: u8, byte: u8) -> CharEscape {
+ match escape {
+ self::BB => CharEscape::Backspace,
+ self::TT => CharEscape::Tab,
+ self::NN => CharEscape::LineFeed,
+ self::FF => CharEscape::FormFeed,
+ self::RR => CharEscape::CarriageReturn,
+ self::QU => CharEscape::Quote,
+ self::BS => CharEscape::ReverseSolidus,
+ self::UU => CharEscape::AsciiControl(byte),
+ _ => unreachable!(),
+ }
+ }
+}
+
+/// This trait abstracts away serializing the JSON control characters, which allows the user to
+/// optionally pretty print the JSON output.
+pub trait Formatter {
+ /// Writes a `null` value to the specified writer.
+ #[inline]
+ fn write_null<W>(&mut self, writer: &mut W) -> io::Result<()>
+ where
+ W: ?Sized + io::Write,
+ {
+ writer.write_all(b"null")
+ }
+
+ /// Writes a `true` or `false` value to the specified writer.
+ #[inline]
+ fn write_bool<W>(&mut self, writer: &mut W, value: bool) -> io::Result<()>
+ where
+ W: ?Sized + io::Write,
+ {
+ let s = if value {
+ b"true" as &[u8]
+ } else {
+ b"false" as &[u8]
+ };
+ writer.write_all(s)
+ }
+
+ /// Writes an integer value like `-123` to the specified writer.
+ #[inline]
+ fn write_i8<W>(&mut self, writer: &mut W, value: i8) -> io::Result<()>
+ where
+ W: ?Sized + io::Write,
+ {
+ let mut buffer = itoa::Buffer::new();
+ let s = buffer.format(value);
+ writer.write_all(s.as_bytes())
+ }
+
+ /// Writes an integer value like `-123` to the specified writer.
+ #[inline]
+ fn write_i16<W>(&mut self, writer: &mut W, value: i16) -> io::Result<()>
+ where
+ W: ?Sized + io::Write,
+ {
+ let mut buffer = itoa::Buffer::new();
+ let s = buffer.format(value);
+ writer.write_all(s.as_bytes())
+ }
+
+ /// Writes an integer value like `-123` to the specified writer.
+ #[inline]
+ fn write_i32<W>(&mut self, writer: &mut W, value: i32) -> io::Result<()>
+ where
+ W: ?Sized + io::Write,
+ {
+ let mut buffer = itoa::Buffer::new();
+ let s = buffer.format(value);
+ writer.write_all(s.as_bytes())
+ }
+
+ /// Writes an integer value like `-123` to the specified writer.
+ #[inline]
+ fn write_i64<W>(&mut self, writer: &mut W, value: i64) -> io::Result<()>
+ where
+ W: ?Sized + io::Write,
+ {
+ let mut buffer = itoa::Buffer::new();
+ let s = buffer.format(value);
+ writer.write_all(s.as_bytes())
+ }
+
+ /// Writes an integer value like `-123` to the specified writer.
+ #[inline]
+ fn write_i128<W>(&mut self, writer: &mut W, value: i128) -> io::Result<()>
+ where
+ W: ?Sized + io::Write,
+ {
+ let mut buffer = itoa::Buffer::new();
+ let s = buffer.format(value);
+ writer.write_all(s.as_bytes())
+ }
+
+ /// Writes an integer value like `123` to the specified writer.
+ #[inline]
+ fn write_u8<W>(&mut self, writer: &mut W, value: u8) -> io::Result<()>
+ where
+ W: ?Sized + io::Write,
+ {
+ let mut buffer = itoa::Buffer::new();
+ let s = buffer.format(value);
+ writer.write_all(s.as_bytes())
+ }
+
+ /// Writes an integer value like `123` to the specified writer.
+ #[inline]
+ fn write_u16<W>(&mut self, writer: &mut W, value: u16) -> io::Result<()>
+ where
+ W: ?Sized + io::Write,
+ {
+ let mut buffer = itoa::Buffer::new();
+ let s = buffer.format(value);
+ writer.write_all(s.as_bytes())
+ }
+
+ /// Writes an integer value like `123` to the specified writer.
+ #[inline]
+ fn write_u32<W>(&mut self, writer: &mut W, value: u32) -> io::Result<()>
+ where
+ W: ?Sized + io::Write,
+ {
+ let mut buffer = itoa::Buffer::new();
+ let s = buffer.format(value);
+ writer.write_all(s.as_bytes())
+ }
+
+ /// Writes an integer value like `123` to the specified writer.
+ #[inline]
+ fn write_u64<W>(&mut self, writer: &mut W, value: u64) -> io::Result<()>
+ where
+ W: ?Sized + io::Write,
+ {
+ let mut buffer = itoa::Buffer::new();
+ let s = buffer.format(value);
+ writer.write_all(s.as_bytes())
+ }
+
+ /// Writes an integer value like `123` to the specified writer.
+ #[inline]
+ fn write_u128<W>(&mut self, writer: &mut W, value: u128) -> io::Result<()>
+ where
+ W: ?Sized + io::Write,
+ {
+ let mut buffer = itoa::Buffer::new();
+ let s = buffer.format(value);
+ writer.write_all(s.as_bytes())
+ }
+
+ /// Writes a floating point value like `-31.26e+12` to the specified writer.
+ #[inline]
+ fn write_f32<W>(&mut self, writer: &mut W, value: f32) -> io::Result<()>
+ where
+ W: ?Sized + io::Write,
+ {
+ let mut buffer = ryu::Buffer::new();
+ let s = buffer.format_finite(value);
+ writer.write_all(s.as_bytes())
+ }
+
+ /// Writes a floating point value like `-31.26e+12` to the specified writer.
+ #[inline]
+ fn write_f64<W>(&mut self, writer: &mut W, value: f64) -> io::Result<()>
+ where
+ W: ?Sized + io::Write,
+ {
+ let mut buffer = ryu::Buffer::new();
+ let s = buffer.format_finite(value);
+ writer.write_all(s.as_bytes())
+ }
+
+ /// Writes a number that has already been rendered to a string.
+ #[inline]
+ fn write_number_str<W>(&mut self, writer: &mut W, value: &str) -> io::Result<()>
+ where
+ W: ?Sized + io::Write,
+ {
+ writer.write_all(value.as_bytes())
+ }
+
+ /// Called before each series of `write_string_fragment` and
+ /// `write_char_escape`. Writes a `"` to the specified writer.
+ #[inline]
+ fn begin_string<W>(&mut self, writer: &mut W) -> io::Result<()>
+ where
+ W: ?Sized + io::Write,
+ {
+ writer.write_all(b"\"")
+ }
+
+ /// Called after each series of `write_string_fragment` and
+ /// `write_char_escape`. Writes a `"` to the specified writer.
+ #[inline]
+ fn end_string<W>(&mut self, writer: &mut W) -> io::Result<()>
+ where
+ W: ?Sized + io::Write,
+ {
+ writer.write_all(b"\"")
+ }
+
+ /// Writes a string fragment that doesn't need any escaping to the
+ /// specified writer.
+ #[inline]
+ fn write_string_fragment<W>(&mut self, writer: &mut W, fragment: &str) -> io::Result<()>
+ where
+ W: ?Sized + io::Write,
+ {
+ writer.write_all(fragment.as_bytes())
+ }
+
+ /// Writes a character escape code to the specified writer.
+ #[inline]
+ fn write_char_escape<W>(&mut self, writer: &mut W, char_escape: CharEscape) -> io::Result<()>
+ where
+ W: ?Sized + io::Write,
+ {
+ use self::CharEscape::*;
+
+ let s = match char_escape {
+ Quote => b"\\\"",
+ ReverseSolidus => b"\\\\",
+ Solidus => b"\\/",
+ Backspace => b"\\b",
+ FormFeed => b"\\f",
+ LineFeed => b"\\n",
+ CarriageReturn => b"\\r",
+ Tab => b"\\t",
+ AsciiControl(byte) => {
+ static HEX_DIGITS: [u8; 16] = *b"0123456789abcdef";
+ let bytes = &[
+ b'\\',
+ b'u',
+ b'0',
+ b'0',
+ HEX_DIGITS[(byte >> 4) as usize],
+ HEX_DIGITS[(byte & 0xF) as usize],
+ ];
+ return writer.write_all(bytes);
+ }
+ };
+
+ writer.write_all(s)
+ }
+
+ /// Writes the representation of a byte array. Formatters can choose whether
+ /// to represent bytes as a JSON array of integers (the default), or some
+ /// JSON string encoding like hex or base64.
+ fn write_byte_array<W>(&mut self, writer: &mut W, value: &[u8]) -> io::Result<()>
+ where
+ W: ?Sized + io::Write,
+ {
+ tri!(self.begin_array(writer));
+ let mut first = true;
+ for byte in value {
+ tri!(self.begin_array_value(writer, first));
+ tri!(self.write_u8(writer, *byte));
+ tri!(self.end_array_value(writer));
+ first = false;
+ }
+ self.end_array(writer)
+ }
+
+ /// Called before every array. Writes a `[` to the specified
+ /// writer.
+ #[inline]
+ fn begin_array<W>(&mut self, writer: &mut W) -> io::Result<()>
+ where
+ W: ?Sized + io::Write,
+ {
+ writer.write_all(b"[")
+ }
+
+ /// Called after every array. Writes a `]` to the specified
+ /// writer.
+ #[inline]
+ fn end_array<W>(&mut self, writer: &mut W) -> io::Result<()>
+ where
+ W: ?Sized + io::Write,
+ {
+ writer.write_all(b"]")
+ }
+
+ /// Called before every array value. Writes a `,` if needed to
+ /// the specified writer.
+ #[inline]
+ fn begin_array_value<W>(&mut self, writer: &mut W, first: bool) -> io::Result<()>
+ where
+ W: ?Sized + io::Write,
+ {
+ if first {
+ Ok(())
+ } else {
+ writer.write_all(b",")
+ }
+ }
+
+ /// Called after every array value.
+ #[inline]
+ fn end_array_value<W>(&mut self, _writer: &mut W) -> io::Result<()>
+ where
+ W: ?Sized + io::Write,
+ {
+ Ok(())
+ }
+
+ /// Called before every object. Writes a `{` to the specified
+ /// writer.
+ #[inline]
+ fn begin_object<W>(&mut self, writer: &mut W) -> io::Result<()>
+ where
+ W: ?Sized + io::Write,
+ {
+ writer.write_all(b"{")
+ }
+
+ /// Called after every object. Writes a `}` to the specified
+ /// writer.
+ #[inline]
+ fn end_object<W>(&mut self, writer: &mut W) -> io::Result<()>
+ where
+ W: ?Sized + io::Write,
+ {
+ writer.write_all(b"}")
+ }
+
+ /// Called before every object key.
+ #[inline]
+ fn begin_object_key<W>(&mut self, writer: &mut W, first: bool) -> io::Result<()>
+ where
+ W: ?Sized + io::Write,
+ {
+ if first {
+ Ok(())
+ } else {
+ writer.write_all(b",")
+ }
+ }
+
+ /// Called after every object key. A `:` should be written to the
+ /// specified writer by either this method or
+ /// `begin_object_value`.
+ #[inline]
+ fn end_object_key<W>(&mut self, _writer: &mut W) -> io::Result<()>
+ where
+ W: ?Sized + io::Write,
+ {
+ Ok(())
+ }
+
+ /// Called before every object value. A `:` should be written to
+ /// the specified writer by either this method or
+ /// `end_object_key`.
+ #[inline]
+ fn begin_object_value<W>(&mut self, writer: &mut W) -> io::Result<()>
+ where
+ W: ?Sized + io::Write,
+ {
+ writer.write_all(b":")
+ }
+
+ /// Called after every object value.
+ #[inline]
+ fn end_object_value<W>(&mut self, _writer: &mut W) -> io::Result<()>
+ where
+ W: ?Sized + io::Write,
+ {
+ Ok(())
+ }
+
+ /// Writes a raw JSON fragment that doesn't need any escaping to the
+ /// specified writer.
+ #[inline]
+ fn write_raw_fragment<W>(&mut self, writer: &mut W, fragment: &str) -> io::Result<()>
+ where
+ W: ?Sized + io::Write,
+ {
+ writer.write_all(fragment.as_bytes())
+ }
+}
+
+/// This structure compacts a JSON value with no extra whitespace.
+#[derive(Clone, Debug)]
+pub struct CompactFormatter;
+
+impl Formatter for CompactFormatter {}
+
+/// This structure pretty prints a JSON value to make it human readable.
+#[derive(Clone, Debug)]
+pub struct PrettyFormatter<'a> {
+ current_indent: usize,
+ has_value: bool,
+ indent: &'a [u8],
+}
+
+impl<'a> PrettyFormatter<'a> {
+ /// Construct a pretty printer formatter that defaults to using two spaces for indentation.
+ pub fn new() -> Self {
+ PrettyFormatter::with_indent(b" ")
+ }
+
+ /// Construct a pretty printer formatter that uses the `indent` string for indentation.
+ pub fn with_indent(indent: &'a [u8]) -> Self {
+ PrettyFormatter {
+ current_indent: 0,
+ has_value: false,
+ indent,
+ }
+ }
+}
+
+impl<'a> Default for PrettyFormatter<'a> {
+ fn default() -> Self {
+ PrettyFormatter::new()
+ }
+}
+
+impl<'a> Formatter for PrettyFormatter<'a> {
+ #[inline]
+ fn begin_array<W>(&mut self, writer: &mut W) -> io::Result<()>
+ where
+ W: ?Sized + io::Write,
+ {
+ self.current_indent += 1;
+ self.has_value = false;
+ writer.write_all(b"[")
+ }
+
+ #[inline]
+ fn end_array<W>(&mut self, writer: &mut W) -> io::Result<()>
+ where
+ W: ?Sized + io::Write,
+ {
+ self.current_indent -= 1;
+
+ if self.has_value {
+ tri!(writer.write_all(b"\n"));
+ tri!(indent(writer, self.current_indent, self.indent));
+ }
+
+ writer.write_all(b"]")
+ }
+
+ #[inline]
+ fn begin_array_value<W>(&mut self, writer: &mut W, first: bool) -> io::Result<()>
+ where
+ W: ?Sized + io::Write,
+ {
+ tri!(writer.write_all(if first { b"\n" } else { b",\n" }));
+ indent(writer, self.current_indent, self.indent)
+ }
+
+ #[inline]
+ fn end_array_value<W>(&mut self, _writer: &mut W) -> io::Result<()>
+ where
+ W: ?Sized + io::Write,
+ {
+ self.has_value = true;
+ Ok(())
+ }
+
+ #[inline]
+ fn begin_object<W>(&mut self, writer: &mut W) -> io::Result<()>
+ where
+ W: ?Sized + io::Write,
+ {
+ self.current_indent += 1;
+ self.has_value = false;
+ writer.write_all(b"{")
+ }
+
+ #[inline]
+ fn end_object<W>(&mut self, writer: &mut W) -> io::Result<()>
+ where
+ W: ?Sized + io::Write,
+ {
+ self.current_indent -= 1;
+
+ if self.has_value {
+ tri!(writer.write_all(b"\n"));
+ tri!(indent(writer, self.current_indent, self.indent));
+ }
+
+ writer.write_all(b"}")
+ }
+
+ #[inline]
+ fn begin_object_key<W>(&mut self, writer: &mut W, first: bool) -> io::Result<()>
+ where
+ W: ?Sized + io::Write,
+ {
+ tri!(writer.write_all(if first { b"\n" } else { b",\n" }));
+ indent(writer, self.current_indent, self.indent)
+ }
+
+ #[inline]
+ fn begin_object_value<W>(&mut self, writer: &mut W) -> io::Result<()>
+ where
+ W: ?Sized + io::Write,
+ {
+ writer.write_all(b": ")
+ }
+
+ #[inline]
+ fn end_object_value<W>(&mut self, _writer: &mut W) -> io::Result<()>
+ where
+ W: ?Sized + io::Write,
+ {
+ self.has_value = true;
+ Ok(())
+ }
+}
+
+fn format_escaped_str<W, F>(writer: &mut W, formatter: &mut F, value: &str) -> io::Result<()>
+where
+ W: ?Sized + io::Write,
+ F: ?Sized + Formatter,
+{
+ tri!(formatter.begin_string(writer));
+ tri!(format_escaped_str_contents(writer, formatter, value));
+ formatter.end_string(writer)
+}
+
+fn format_escaped_str_contents<W, F>(
+ writer: &mut W,
+ formatter: &mut F,
+ value: &str,
+) -> io::Result<()>
+where
+ W: ?Sized + io::Write,
+ F: ?Sized + Formatter,
+{
+ let bytes = value.as_bytes();
+
+ let mut start = 0;
+
+ for (i, &byte) in bytes.iter().enumerate() {
+ let escape = ESCAPE[byte as usize];
+ if escape == 0 {
+ continue;
+ }
+
+ if start < i {
+ tri!(formatter.write_string_fragment(writer, &value[start..i]));
+ }
+
+ let char_escape = CharEscape::from_escape_table(escape, byte);
+ tri!(formatter.write_char_escape(writer, char_escape));
+
+ start = i + 1;
+ }
+
+ if start == bytes.len() {
+ return Ok(());
+ }
+
+ formatter.write_string_fragment(writer, &value[start..])
+}
+
+const BB: u8 = b'b'; // \x08
+const TT: u8 = b't'; // \x09
+const NN: u8 = b'n'; // \x0A
+const FF: u8 = b'f'; // \x0C
+const RR: u8 = b'r'; // \x0D
+const QU: u8 = b'"'; // \x22
+const BS: u8 = b'\\'; // \x5C
+const UU: u8 = b'u'; // \x00...\x1F except the ones above
+const __: u8 = 0;
+
+// Lookup table of escape sequences. A value of b'x' at index i means that byte
+// i is escaped as "\x" in JSON. A value of 0 means that byte i is not escaped.
+static ESCAPE: [u8; 256] = [
+ // 1 2 3 4 5 6 7 8 9 A B C D E F
+ UU, UU, UU, UU, UU, UU, UU, UU, BB, TT, NN, UU, FF, RR, UU, UU, // 0
+ UU, UU, UU, UU, UU, UU, UU, UU, UU, UU, UU, UU, UU, UU, UU, UU, // 1
+ __, __, QU, __, __, __, __, __, __, __, __, __, __, __, __, __, // 2
+ __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // 3
+ __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // 4
+ __, __, __, __, __, __, __, __, __, __, __, __, BS, __, __, __, // 5
+ __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // 6
+ __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // 7
+ __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // 8
+ __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // 9
+ __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // A
+ __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // B
+ __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // C
+ __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // D
+ __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // E
+ __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // F
+];
+
+/// Serialize the given data structure as JSON into the I/O stream.
+///
+/// Serialization guarantees it only feeds valid UTF-8 sequences to the writer.
+///
+/// # Errors
+///
+/// Serialization can fail if `T`'s implementation of `Serialize` decides to
+/// fail, or if `T` contains a map with non-string keys.
+#[inline]
+#[cfg_attr(docsrs, doc(cfg(feature = "std")))]
+pub fn to_writer<W, T>(writer: W, value: &T) -> Result<()>
+where
+ W: io::Write,
+ T: ?Sized + Serialize,
+{
+ let mut ser = Serializer::new(writer);
+ value.serialize(&mut ser)
+}
+
+/// Serialize the given data structure as pretty-printed JSON into the I/O
+/// stream.
+///
+/// Serialization guarantees it only feeds valid UTF-8 sequences to the writer.
+///
+/// # Errors
+///
+/// Serialization can fail if `T`'s implementation of `Serialize` decides to
+/// fail, or if `T` contains a map with non-string keys.
+#[inline]
+#[cfg_attr(docsrs, doc(cfg(feature = "std")))]
+pub fn to_writer_pretty<W, T>(writer: W, value: &T) -> Result<()>
+where
+ W: io::Write,
+ T: ?Sized + Serialize,
+{
+ let mut ser = Serializer::pretty(writer);
+ value.serialize(&mut ser)
+}
+
+/// Serialize the given data structure as a JSON byte vector.
+///
+/// # Errors
+///
+/// Serialization can fail if `T`'s implementation of `Serialize` decides to
+/// fail, or if `T` contains a map with non-string keys.
+#[inline]
+pub fn to_vec<T>(value: &T) -> Result<Vec<u8>>
+where
+ T: ?Sized + Serialize,
+{
+ let mut writer = Vec::with_capacity(128);
+ tri!(to_writer(&mut writer, value));
+ Ok(writer)
+}
+
+/// Serialize the given data structure as a pretty-printed JSON byte vector.
+///
+/// # Errors
+///
+/// Serialization can fail if `T`'s implementation of `Serialize` decides to
+/// fail, or if `T` contains a map with non-string keys.
+#[inline]
+pub fn to_vec_pretty<T>(value: &T) -> Result<Vec<u8>>
+where
+ T: ?Sized + Serialize,
+{
+ let mut writer = Vec::with_capacity(128);
+ tri!(to_writer_pretty(&mut writer, value));
+ Ok(writer)
+}
+
+/// Serialize the given data structure as a String of JSON.
+///
+/// # Errors
+///
+/// Serialization can fail if `T`'s implementation of `Serialize` decides to
+/// fail, or if `T` contains a map with non-string keys.
+#[inline]
+pub fn to_string<T>(value: &T) -> Result<String>
+where
+ T: ?Sized + Serialize,
+{
+ let vec = tri!(to_vec(value));
+ let string = unsafe {
+ // We do not emit invalid UTF-8.
+ String::from_utf8_unchecked(vec)
+ };
+ Ok(string)
+}
+
+/// Serialize the given data structure as a pretty-printed String of JSON.
+///
+/// # Errors
+///
+/// Serialization can fail if `T`'s implementation of `Serialize` decides to
+/// fail, or if `T` contains a map with non-string keys.
+#[inline]
+pub fn to_string_pretty<T>(value: &T) -> Result<String>
+where
+ T: ?Sized + Serialize,
+{
+ let vec = tri!(to_vec_pretty(value));
+ let string = unsafe {
+ // We do not emit invalid UTF-8.
+ String::from_utf8_unchecked(vec)
+ };
+ Ok(string)
+}
+
+fn indent<W>(wr: &mut W, n: usize, s: &[u8]) -> io::Result<()>
+where
+ W: ?Sized + io::Write,
+{
+ for _ in 0..n {
+ tri!(wr.write_all(s));
+ }
+
+ Ok(())
+}
Copyright © 2024 Valentin A. Popov. All Rights Reverse Engineered.