serde_json/
number.rs

1use crate::de::ParserNumber;
2use crate::error::Error;
3#[cfg(feature = "arbitrary_precision")]
4use crate::error::ErrorCode;
5#[cfg(feature = "arbitrary_precision")]
6use alloc::borrow::ToOwned;
7#[cfg(feature = "arbitrary_precision")]
8use alloc::string::{String, ToString};
9use core::fmt::{self, Debug, Display};
10#[cfg(not(feature = "arbitrary_precision"))]
11use core::hash::{Hash, Hasher};
12use serde::de::{self, Unexpected, Visitor};
13#[cfg(feature = "arbitrary_precision")]
14use serde::de::{IntoDeserializer, MapAccess};
15use serde::{forward_to_deserialize_any, Deserialize, Deserializer, Serialize, Serializer};
16
17#[cfg(feature = "arbitrary_precision")]
18pub(crate) const TOKEN: &str = "$serde_json::private::Number";
19
20/// Represents a JSON number, whether integer or floating point.
21#[derive(Clone, PartialEq, Eq, Hash)]
22pub struct Number {
23    n: N,
24}
25
26#[cfg(not(feature = "arbitrary_precision"))]
27#[derive(Copy, Clone)]
28enum N {
29    PosInt(u64),
30    /// Always less than zero.
31    NegInt(i64),
32    /// Always finite.
33    Float(f64),
34}
35
36#[cfg(not(feature = "arbitrary_precision"))]
37impl PartialEq for N {
38    fn eq(&self, other: &Self) -> bool {
39        match (self, other) {
40            (N::PosInt(a), N::PosInt(b)) => a == b,
41            (N::NegInt(a), N::NegInt(b)) => a == b,
42            (N::Float(a), N::Float(b)) => a == b,
43            _ => false,
44        }
45    }
46}
47
48// Implementing Eq is fine since any float values are always finite.
49#[cfg(not(feature = "arbitrary_precision"))]
50impl Eq for N {}
51
52#[cfg(not(feature = "arbitrary_precision"))]
53impl Hash for N {
54    fn hash<H: Hasher>(&self, h: &mut H) {
55        match *self {
56            N::PosInt(i) => i.hash(h),
57            N::NegInt(i) => i.hash(h),
58            N::Float(f) => {
59                if f == 0.0f64 {
60                    // There are 2 zero representations, +0 and -0, which
61                    // compare equal but have different bits. We use the +0 hash
62                    // for both so that hash(+0) == hash(-0).
63                    0.0f64.to_bits().hash(h);
64                } else {
65                    f.to_bits().hash(h);
66                }
67            }
68        }
69    }
70}
71
72#[cfg(feature = "arbitrary_precision")]
73type N = String;
74
75impl Number {
76    /// Returns true if the `Number` is an integer between `i64::MIN` and
77    /// `i64::MAX`.
78    ///
79    /// For any Number on which `is_i64` returns true, `as_i64` is guaranteed to
80    /// return the integer value.
81    pub fn is_i64(&self) -> bool {
82        #[cfg(not(feature = "arbitrary_precision"))]
83        match self.n {
84            N::PosInt(v) => v <= i64::MAX as u64,
85            N::NegInt(_) => true,
86            N::Float(_) => false,
87        }
88        #[cfg(feature = "arbitrary_precision")]
89        self.as_i64().is_some()
90    }
91
92    /// Returns true if the `Number` is an integer between zero and `u64::MAX`.
93    ///
94    /// For any Number on which `is_u64` returns true, `as_u64` is guaranteed to
95    /// return the integer value.
96    pub fn is_u64(&self) -> bool {
97        #[cfg(not(feature = "arbitrary_precision"))]
98        match self.n {
99            N::PosInt(_) => true,
100            N::NegInt(_) | N::Float(_) => false,
101        }
102        #[cfg(feature = "arbitrary_precision")]
103        self.as_u64().is_some()
104    }
105
106    /// Returns true if the `Number` can be represented by f64.
107    ///
108    /// For any Number on which `is_f64` returns true, `as_f64` is guaranteed to
109    /// return the floating point value.
110    ///
111    /// Currently this function returns true if and only if both `is_i64` and
112    /// `is_u64` return false but this is not a guarantee in the future.
113    pub fn is_f64(&self) -> bool {
114        #[cfg(not(feature = "arbitrary_precision"))]
115        match self.n {
116            N::Float(_) => true,
117            N::PosInt(_) | N::NegInt(_) => false,
118        }
119        #[cfg(feature = "arbitrary_precision")]
120        {
121            for c in self.n.chars() {
122                if c == '.' || c == 'e' || c == 'E' {
123                    return self.n.parse::<f64>().ok().map_or(false, f64::is_finite);
124                }
125            }
126            false
127        }
128    }
129
130    /// If the `Number` is an integer, represent it as i64 if possible. Returns
131    /// None otherwise.
132    pub fn as_i64(&self) -> Option<i64> {
133        #[cfg(not(feature = "arbitrary_precision"))]
134        match self.n {
135            N::PosInt(n) => {
136                if n <= i64::MAX as u64 {
137                    Some(n as i64)
138                } else {
139                    None
140                }
141            }
142            N::NegInt(n) => Some(n),
143            N::Float(_) => None,
144        }
145        #[cfg(feature = "arbitrary_precision")]
146        self.n.parse().ok()
147    }
148
149    /// If the `Number` is an integer, represent it as u64 if possible. Returns
150    /// None otherwise.
151    pub fn as_u64(&self) -> Option<u64> {
152        #[cfg(not(feature = "arbitrary_precision"))]
153        match self.n {
154            N::PosInt(n) => Some(n),
155            N::NegInt(_) | N::Float(_) => None,
156        }
157        #[cfg(feature = "arbitrary_precision")]
158        self.n.parse().ok()
159    }
160
161    /// Represents the number as f64 if possible. Returns None otherwise.
162    pub fn as_f64(&self) -> Option<f64> {
163        #[cfg(not(feature = "arbitrary_precision"))]
164        match self.n {
165            N::PosInt(n) => Some(n as f64),
166            N::NegInt(n) => Some(n as f64),
167            N::Float(n) => Some(n),
168        }
169        #[cfg(feature = "arbitrary_precision")]
170        self.n.parse::<f64>().ok().filter(|float| float.is_finite())
171    }
172
173    /// Converts a finite `f64` to a `Number`. Infinite or NaN values are not JSON
174    /// numbers.
175    ///
176    /// ```
177    /// # use serde_json::Number;
178    /// #
179    /// assert!(Number::from_f64(256.0).is_some());
180    ///
181    /// assert!(Number::from_f64(f64::NAN).is_none());
182    /// ```
183    pub fn from_f64(f: f64) -> Option<Number> {
184        if f.is_finite() {
185            let n = {
186                #[cfg(not(feature = "arbitrary_precision"))]
187                {
188                    N::Float(f)
189                }
190                #[cfg(feature = "arbitrary_precision")]
191                {
192                    ryu::Buffer::new().format_finite(f).to_owned()
193                }
194            };
195            Some(Number { n })
196        } else {
197            None
198        }
199    }
200
201    /// If the `Number` is an integer, represent it as i128 if possible. Returns
202    /// None otherwise.
203    pub fn as_i128(&self) -> Option<i128> {
204        #[cfg(not(feature = "arbitrary_precision"))]
205        match self.n {
206            N::PosInt(n) => Some(n as i128),
207            N::NegInt(n) => Some(n as i128),
208            N::Float(_) => None,
209        }
210        #[cfg(feature = "arbitrary_precision")]
211        self.n.parse().ok()
212    }
213
214    /// If the `Number` is an integer, represent it as u128 if possible. Returns
215    /// None otherwise.
216    pub fn as_u128(&self) -> Option<u128> {
217        #[cfg(not(feature = "arbitrary_precision"))]
218        match self.n {
219            N::PosInt(n) => Some(n as u128),
220            N::NegInt(_) | N::Float(_) => None,
221        }
222        #[cfg(feature = "arbitrary_precision")]
223        self.n.parse().ok()
224    }
225
226    /// Converts an `i128` to a `Number`. Numbers smaller than i64::MIN or
227    /// larger than u64::MAX can only be represented in `Number` if serde_json's
228    /// "arbitrary_precision" feature is enabled.
229    ///
230    /// ```
231    /// # use serde_json::Number;
232    /// #
233    /// assert!(Number::from_i128(256).is_some());
234    /// ```
235    pub fn from_i128(i: i128) -> Option<Number> {
236        let n = {
237            #[cfg(not(feature = "arbitrary_precision"))]
238            {
239                if let Ok(u) = u64::try_from(i) {
240                    N::PosInt(u)
241                } else if let Ok(i) = i64::try_from(i) {
242                    N::NegInt(i)
243                } else {
244                    return None;
245                }
246            }
247            #[cfg(feature = "arbitrary_precision")]
248            {
249                i.to_string()
250            }
251        };
252        Some(Number { n })
253    }
254
255    /// Converts a `u128` to a `Number`. Numbers greater than u64::MAX can only
256    /// be represented in `Number` if serde_json's "arbitrary_precision" feature
257    /// is enabled.
258    ///
259    /// ```
260    /// # use serde_json::Number;
261    /// #
262    /// assert!(Number::from_u128(256).is_some());
263    /// ```
264    pub fn from_u128(i: u128) -> Option<Number> {
265        let n = {
266            #[cfg(not(feature = "arbitrary_precision"))]
267            {
268                if let Ok(u) = u64::try_from(i) {
269                    N::PosInt(u)
270                } else {
271                    return None;
272                }
273            }
274            #[cfg(feature = "arbitrary_precision")]
275            {
276                i.to_string()
277            }
278        };
279        Some(Number { n })
280    }
281
282    /// Returns the exact original JSON representation that this Number was
283    /// parsed from.
284    ///
285    /// For numbers constructed not via parsing, such as by `From<i32>`, returns
286    /// the JSON representation that serde\_json would serialize for this
287    /// number.
288    ///
289    /// ```
290    /// # use serde_json::Number;
291    /// for value in [
292    ///     "7",
293    ///     "12.34",
294    ///     "34e-56789",
295    ///     "0.0123456789000000012345678900000001234567890000123456789",
296    ///     "343412345678910111213141516171819202122232425262728293034",
297    ///     "-343412345678910111213141516171819202122232425262728293031",
298    /// ] {
299    ///     let number: Number = serde_json::from_str(value).unwrap();
300    ///     assert_eq!(number.as_str(), value);
301    /// }
302    /// ```
303    #[cfg(feature = "arbitrary_precision")]
304    #[cfg_attr(docsrs, doc(cfg(feature = "arbitrary_precision")))]
305    pub fn as_str(&self) -> &str {
306        &self.n
307    }
308
309    pub(crate) fn as_f32(&self) -> Option<f32> {
310        #[cfg(not(feature = "arbitrary_precision"))]
311        match self.n {
312            N::PosInt(n) => Some(n as f32),
313            N::NegInt(n) => Some(n as f32),
314            N::Float(n) => Some(n as f32),
315        }
316        #[cfg(feature = "arbitrary_precision")]
317        self.n.parse::<f32>().ok().filter(|float| float.is_finite())
318    }
319
320    pub(crate) fn from_f32(f: f32) -> Option<Number> {
321        if f.is_finite() {
322            let n = {
323                #[cfg(not(feature = "arbitrary_precision"))]
324                {
325                    N::Float(f as f64)
326                }
327                #[cfg(feature = "arbitrary_precision")]
328                {
329                    ryu::Buffer::new().format_finite(f).to_owned()
330                }
331            };
332            Some(Number { n })
333        } else {
334            None
335        }
336    }
337
338    #[cfg(feature = "arbitrary_precision")]
339    /// Not public API. Only tests use this.
340    #[doc(hidden)]
341    #[inline]
342    pub fn from_string_unchecked(n: String) -> Self {
343        Number { n }
344    }
345}
346
347impl Display for Number {
348    #[cfg(not(feature = "arbitrary_precision"))]
349    fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
350        match self.n {
351            N::PosInt(u) => formatter.write_str(itoa::Buffer::new().format(u)),
352            N::NegInt(i) => formatter.write_str(itoa::Buffer::new().format(i)),
353            N::Float(f) => formatter.write_str(ryu::Buffer::new().format_finite(f)),
354        }
355    }
356
357    #[cfg(feature = "arbitrary_precision")]
358    fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
359        Display::fmt(&self.n, formatter)
360    }
361}
362
363impl Debug for Number {
364    fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
365        write!(formatter, "Number({})", self)
366    }
367}
368
369impl Serialize for Number {
370    #[cfg(not(feature = "arbitrary_precision"))]
371    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
372    where
373        S: Serializer,
374    {
375        match self.n {
376            N::PosInt(u) => serializer.serialize_u64(u),
377            N::NegInt(i) => serializer.serialize_i64(i),
378            N::Float(f) => serializer.serialize_f64(f),
379        }
380    }
381
382    #[cfg(feature = "arbitrary_precision")]
383    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
384    where
385        S: Serializer,
386    {
387        use serde::ser::SerializeStruct;
388
389        let mut s = tri!(serializer.serialize_struct(TOKEN, 1));
390        tri!(s.serialize_field(TOKEN, &self.n));
391        s.end()
392    }
393}
394
395impl<'de> Deserialize<'de> for Number {
396    #[inline]
397    fn deserialize<D>(deserializer: D) -> Result<Number, D::Error>
398    where
399        D: Deserializer<'de>,
400    {
401        struct NumberVisitor;
402
403        impl<'de> Visitor<'de> for NumberVisitor {
404            type Value = Number;
405
406            fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
407                formatter.write_str("a JSON number")
408            }
409
410            fn visit_i64<E>(self, value: i64) -> Result<Number, E> {
411                Ok(value.into())
412            }
413
414            fn visit_i128<E>(self, value: i128) -> Result<Number, E>
415            where
416                E: de::Error,
417            {
418                Number::from_i128(value)
419                    .ok_or_else(|| de::Error::custom("JSON number out of range"))
420            }
421
422            fn visit_u64<E>(self, value: u64) -> Result<Number, E> {
423                Ok(value.into())
424            }
425
426            fn visit_u128<E>(self, value: u128) -> Result<Number, E>
427            where
428                E: de::Error,
429            {
430                Number::from_u128(value)
431                    .ok_or_else(|| de::Error::custom("JSON number out of range"))
432            }
433
434            fn visit_f64<E>(self, value: f64) -> Result<Number, E>
435            where
436                E: de::Error,
437            {
438                Number::from_f64(value).ok_or_else(|| de::Error::custom("not a JSON number"))
439            }
440
441            #[cfg(feature = "arbitrary_precision")]
442            fn visit_map<V>(self, mut visitor: V) -> Result<Number, V::Error>
443            where
444                V: de::MapAccess<'de>,
445            {
446                let value = tri!(visitor.next_key::<NumberKey>());
447                if value.is_none() {
448                    return Err(de::Error::invalid_type(Unexpected::Map, &self));
449                }
450                let v: NumberFromString = tri!(visitor.next_value());
451                Ok(v.value)
452            }
453        }
454
455        deserializer.deserialize_any(NumberVisitor)
456    }
457}
458
459#[cfg(feature = "arbitrary_precision")]
460struct NumberKey;
461
462#[cfg(feature = "arbitrary_precision")]
463impl<'de> de::Deserialize<'de> for NumberKey {
464    fn deserialize<D>(deserializer: D) -> Result<NumberKey, D::Error>
465    where
466        D: de::Deserializer<'de>,
467    {
468        struct FieldVisitor;
469
470        impl<'de> de::Visitor<'de> for FieldVisitor {
471            type Value = ();
472
473            fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
474                formatter.write_str("a valid number field")
475            }
476
477            fn visit_str<E>(self, s: &str) -> Result<(), E>
478            where
479                E: de::Error,
480            {
481                if s == TOKEN {
482                    Ok(())
483                } else {
484                    Err(de::Error::custom("expected field with custom name"))
485                }
486            }
487        }
488
489        tri!(deserializer.deserialize_identifier(FieldVisitor));
490        Ok(NumberKey)
491    }
492}
493
494#[cfg(feature = "arbitrary_precision")]
495pub struct NumberFromString {
496    pub value: Number,
497}
498
499#[cfg(feature = "arbitrary_precision")]
500impl<'de> de::Deserialize<'de> for NumberFromString {
501    fn deserialize<D>(deserializer: D) -> Result<NumberFromString, D::Error>
502    where
503        D: de::Deserializer<'de>,
504    {
505        struct Visitor;
506
507        impl<'de> de::Visitor<'de> for Visitor {
508            type Value = NumberFromString;
509
510            fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
511                formatter.write_str("string containing a number")
512            }
513
514            fn visit_str<E>(self, s: &str) -> Result<NumberFromString, E>
515            where
516                E: de::Error,
517            {
518                let n = tri!(s.parse().map_err(de::Error::custom));
519                Ok(NumberFromString { value: n })
520            }
521        }
522
523        deserializer.deserialize_str(Visitor)
524    }
525}
526
527#[cfg(feature = "arbitrary_precision")]
528fn invalid_number() -> Error {
529    Error::syntax(ErrorCode::InvalidNumber, 0, 0)
530}
531
532macro_rules! deserialize_any {
533    (@expand [$($num_string:tt)*]) => {
534        #[cfg(not(feature = "arbitrary_precision"))]
535        fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Error>
536        where
537            V: Visitor<'de>,
538        {
539            match self.n {
540                N::PosInt(u) => visitor.visit_u64(u),
541                N::NegInt(i) => visitor.visit_i64(i),
542                N::Float(f) => visitor.visit_f64(f),
543            }
544        }
545
546        #[cfg(feature = "arbitrary_precision")]
547        fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Error>
548            where V: Visitor<'de>
549        {
550            if let Some(u) = self.as_u64() {
551                return visitor.visit_u64(u);
552            } else if let Some(i) = self.as_i64() {
553                return visitor.visit_i64(i);
554            } else if let Some(u) = self.as_u128() {
555                return visitor.visit_u128(u);
556            } else if let Some(i) = self.as_i128() {
557                return visitor.visit_i128(i);
558            } else if let Some(f) = self.as_f64() {
559                if ryu::Buffer::new().format_finite(f) == self.n || f.to_string() == self.n {
560                    return visitor.visit_f64(f);
561                }
562            }
563
564            visitor.visit_map(NumberDeserializer {
565                number: Some(self.$($num_string)*),
566            })
567        }
568    };
569
570    (owned) => {
571        deserialize_any!(@expand [n]);
572    };
573
574    (ref) => {
575        deserialize_any!(@expand [n.clone()]);
576    };
577}
578
579macro_rules! deserialize_number {
580    ($deserialize:ident => $visit:ident) => {
581        #[cfg(not(feature = "arbitrary_precision"))]
582        fn $deserialize<V>(self, visitor: V) -> Result<V::Value, Error>
583        where
584            V: Visitor<'de>,
585        {
586            self.deserialize_any(visitor)
587        }
588
589        #[cfg(feature = "arbitrary_precision")]
590        fn $deserialize<V>(self, visitor: V) -> Result<V::Value, Error>
591        where
592            V: de::Visitor<'de>,
593        {
594            visitor.$visit(tri!(self.n.parse().map_err(|_| invalid_number())))
595        }
596    };
597}
598
599impl<'de> Deserializer<'de> for Number {
600    type Error = Error;
601
602    deserialize_any!(owned);
603
604    deserialize_number!(deserialize_i8 => visit_i8);
605    deserialize_number!(deserialize_i16 => visit_i16);
606    deserialize_number!(deserialize_i32 => visit_i32);
607    deserialize_number!(deserialize_i64 => visit_i64);
608    deserialize_number!(deserialize_i128 => visit_i128);
609    deserialize_number!(deserialize_u8 => visit_u8);
610    deserialize_number!(deserialize_u16 => visit_u16);
611    deserialize_number!(deserialize_u32 => visit_u32);
612    deserialize_number!(deserialize_u64 => visit_u64);
613    deserialize_number!(deserialize_u128 => visit_u128);
614    deserialize_number!(deserialize_f32 => visit_f32);
615    deserialize_number!(deserialize_f64 => visit_f64);
616
617    forward_to_deserialize_any! {
618        bool char str string bytes byte_buf option unit unit_struct
619        newtype_struct seq tuple tuple_struct map struct enum identifier
620        ignored_any
621    }
622}
623
624impl<'de> Deserializer<'de> for &Number {
625    type Error = Error;
626
627    deserialize_any!(ref);
628
629    deserialize_number!(deserialize_i8 => visit_i8);
630    deserialize_number!(deserialize_i16 => visit_i16);
631    deserialize_number!(deserialize_i32 => visit_i32);
632    deserialize_number!(deserialize_i64 => visit_i64);
633    deserialize_number!(deserialize_i128 => visit_i128);
634    deserialize_number!(deserialize_u8 => visit_u8);
635    deserialize_number!(deserialize_u16 => visit_u16);
636    deserialize_number!(deserialize_u32 => visit_u32);
637    deserialize_number!(deserialize_u64 => visit_u64);
638    deserialize_number!(deserialize_u128 => visit_u128);
639    deserialize_number!(deserialize_f32 => visit_f32);
640    deserialize_number!(deserialize_f64 => visit_f64);
641
642    forward_to_deserialize_any! {
643        bool char str string bytes byte_buf option unit unit_struct
644        newtype_struct seq tuple tuple_struct map struct enum identifier
645        ignored_any
646    }
647}
648
649#[cfg(feature = "arbitrary_precision")]
650pub(crate) struct NumberDeserializer {
651    pub number: Option<String>,
652}
653
654#[cfg(feature = "arbitrary_precision")]
655impl<'de> MapAccess<'de> for NumberDeserializer {
656    type Error = Error;
657
658    fn next_key_seed<K>(&mut self, seed: K) -> Result<Option<K::Value>, Error>
659    where
660        K: de::DeserializeSeed<'de>,
661    {
662        if self.number.is_none() {
663            return Ok(None);
664        }
665        seed.deserialize(NumberFieldDeserializer).map(Some)
666    }
667
668    fn next_value_seed<V>(&mut self, seed: V) -> Result<V::Value, Error>
669    where
670        V: de::DeserializeSeed<'de>,
671    {
672        seed.deserialize(self.number.take().unwrap().into_deserializer())
673    }
674}
675
676#[cfg(feature = "arbitrary_precision")]
677struct NumberFieldDeserializer;
678
679#[cfg(feature = "arbitrary_precision")]
680impl<'de> Deserializer<'de> for NumberFieldDeserializer {
681    type Error = Error;
682
683    fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Error>
684    where
685        V: de::Visitor<'de>,
686    {
687        visitor.visit_borrowed_str(TOKEN)
688    }
689
690    forward_to_deserialize_any! {
691        bool u8 u16 u32 u64 u128 i8 i16 i32 i64 i128 f32 f64 char str string seq
692        bytes byte_buf map struct option unit newtype_struct ignored_any
693        unit_struct tuple_struct tuple enum identifier
694    }
695}
696
697impl From<ParserNumber> for Number {
698    fn from(value: ParserNumber) -> Self {
699        let n = match value {
700            ParserNumber::F64(f) => {
701                #[cfg(not(feature = "arbitrary_precision"))]
702                {
703                    N::Float(f)
704                }
705                #[cfg(feature = "arbitrary_precision")]
706                {
707                    ryu::Buffer::new().format_finite(f).to_owned()
708                }
709            }
710            ParserNumber::U64(u) => {
711                #[cfg(not(feature = "arbitrary_precision"))]
712                {
713                    N::PosInt(u)
714                }
715                #[cfg(feature = "arbitrary_precision")]
716                {
717                    itoa::Buffer::new().format(u).to_owned()
718                }
719            }
720            ParserNumber::I64(i) => {
721                #[cfg(not(feature = "arbitrary_precision"))]
722                {
723                    N::NegInt(i)
724                }
725                #[cfg(feature = "arbitrary_precision")]
726                {
727                    itoa::Buffer::new().format(i).to_owned()
728                }
729            }
730            #[cfg(feature = "arbitrary_precision")]
731            ParserNumber::String(s) => s,
732        };
733        Number { n }
734    }
735}
736
737macro_rules! impl_from_unsigned {
738    (
739        $($ty:ty),*
740    ) => {
741        $(
742            impl From<$ty> for Number {
743                fn from(u: $ty) -> Self {
744                    let n = {
745                        #[cfg(not(feature = "arbitrary_precision"))]
746                        { N::PosInt(u as u64) }
747                        #[cfg(feature = "arbitrary_precision")]
748                        {
749                            itoa::Buffer::new().format(u).to_owned()
750                        }
751                    };
752                    Number { n }
753                }
754            }
755        )*
756    };
757}
758
759macro_rules! impl_from_signed {
760    (
761        $($ty:ty),*
762    ) => {
763        $(
764            impl From<$ty> for Number {
765                fn from(i: $ty) -> Self {
766                    let n = {
767                        #[cfg(not(feature = "arbitrary_precision"))]
768                        {
769                            if i < 0 {
770                                N::NegInt(i as i64)
771                            } else {
772                                N::PosInt(i as u64)
773                            }
774                        }
775                        #[cfg(feature = "arbitrary_precision")]
776                        {
777                            itoa::Buffer::new().format(i).to_owned()
778                        }
779                    };
780                    Number { n }
781                }
782            }
783        )*
784    };
785}
786
787impl_from_unsigned!(u8, u16, u32, u64, usize);
788impl_from_signed!(i8, i16, i32, i64, isize);
789
790#[cfg(feature = "arbitrary_precision")]
791impl_from_unsigned!(u128);
792#[cfg(feature = "arbitrary_precision")]
793impl_from_signed!(i128);
794
795impl Number {
796    #[cfg(not(feature = "arbitrary_precision"))]
797    #[cold]
798    pub(crate) fn unexpected(&self) -> Unexpected {
799        match self.n {
800            N::PosInt(u) => Unexpected::Unsigned(u),
801            N::NegInt(i) => Unexpected::Signed(i),
802            N::Float(f) => Unexpected::Float(f),
803        }
804    }
805
806    #[cfg(feature = "arbitrary_precision")]
807    #[cold]
808    pub(crate) fn unexpected(&self) -> Unexpected {
809        Unexpected::Other("number")
810    }
811}
serde_json/number.rs

serde_json/
number.rs
