Merge pull request #982 from serde-rs/integer128tovalue

Support 128-bit integers in to_value

Author: dtolnay

src/value/ser.rs

@@ -5,6 +5,8 @@ use crate::value::{to_value, Value};
 use alloc::borrow::ToOwned;
 use alloc::string::{String, ToString};
 use alloc::vec::Vec;
+#[cfg(not(feature = "arbitrary_precision"))]
+use core::convert::TryFrom;
 use core::fmt::Display;
 use core::result;
 use serde::ser::{Impossible, Serialize};
@@ -92,9 +94,22 @@ impl serde::Serializer for Serializer {
         Ok(Value::Number(value.into()))
     }
 
-    #[cfg(feature = "arbitrary_precision")]
     fn serialize_i128(self, value: i128) -> Result<Value> {
-        Ok(Value::Number(value.into()))
+        #[cfg(feature = "arbitrary_precision")]
+        {
+            Ok(Value::Number(value.into()))
+        }
+
+        #[cfg(not(feature = "arbitrary_precision"))]
+        {
+            if let Ok(value) = u64::try_from(value) {
+                Ok(Value::Number(value.into()))
+            } else if let Ok(value) = i64::try_from(value) {
+                Ok(Value::Number(value.into()))
+            } else {
+                Err(Error::syntax(ErrorCode::NumberOutOfRange, 0, 0))
+            }
+        }
     }
 
     #[inline]
@@ -117,9 +132,20 @@ impl serde::Serializer for Serializer {
         Ok(Value::Number(value.into()))
     }
 
-    #[cfg(feature = "arbitrary_precision")]
     fn serialize_u128(self, value: u128) -> Result<Value> {
-        Ok(Value::Number(value.into()))
+        #[cfg(feature = "arbitrary_precision")]
+        {
+            Ok(Value::Number(value.into()))
+        }
+
+        #[cfg(not(feature = "arbitrary_precision"))]
+        {
+            if let Ok(value) = u64::try_from(value) {
+                Ok(Value::Number(value.into()))
+            } else {
+                Err(Error::syntax(ErrorCode::NumberOutOfRange, 0, 0))
+            }
+        }
     }
 
     #[inline]

tests/test.rs

@@ -2180,6 +2180,27 @@ fn test_integer128() {
     ]);
 }
 
+#[test]
+fn test_integer128_to_value() {
+    let signed = &[i128::from(i64::min_value()), i128::from(u64::max_value())];
+    let unsigned = &[0, u128::from(u64::max_value())];
+
+    for integer128 in signed {
+        let expected = integer128.to_string();
+        assert_eq!(to_value(integer128).unwrap().to_string(), expected);
+    }
+
+    for integer128 in unsigned {
+        let expected = integer128.to_string();
+        assert_eq!(to_value(integer128).unwrap().to_string(), expected);
+    }
+
+    if !cfg!(feature = "arbitrary_precision") {
+        let err = to_value(u128::from(u64::max_value()) + 1).unwrap_err();
+        assert_eq!(err.to_string(), "number out of range");
+    }
+}
+
 #[cfg(feature = "raw_value")]
 #[test]
 fn test_borrowed_raw_value() {