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refactor: json-stream-parser aligned to clippy standard

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Per Stark
2026-05-27 09:07:38 +02:00
parent 414d2f5b34
commit 18aadab8ee
3 changed files with 196 additions and 167 deletions
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json-stream-parser/Cargo.toml
+1
View File
@@ -9,3 +9,4 @@ workspace = true
[dependencies]
serde_json = { workspace = true }
thiserror = { workspace = true }
json-stream-parser/src/lib.rs
+194 -167
View File
@@ -1,6 +1,7 @@
// This code is based on the json-stream-rust library (https://github.com/json-stream/json-stream-rust)
// Original code is MIT licensed
// Modified to fix escape character handling in strings
use std::mem;
use serde_json::{json, Value};
#[derive(Clone, Debug)]
@@ -9,107 +10,122 @@ enum ObjectStatus {
StringQuoteOpen(bool),
StringQuoteClose,
Scalar {
value_so_far: Vec<char>,
value_so_far: String,
},
ScalarNumber {
value_so_far: Vec<char>,
value_so_far: String,
},
StartProperty,
KeyQuoteOpen {
key_so_far: Vec<char>,
key_so_far: String,
escaped: bool,
},
KeyQuoteClose {
key: Vec<char>,
key: String,
},
Colon {
key: Vec<char>,
key: String,
},
ValueQuoteOpen {
key: Vec<char>,
key: String,
escaped: bool,
},
ValueQuoteClose,
ValueScalar {
key: Vec<char>,
value_so_far: Vec<char>,
key: String,
value_so_far: String,
},
Closed,
}
/// Errors that can occur during streaming JSON parsing.
#[derive(Debug, thiserror::Error)]
pub enum ParseError {
/// A key that was expected to have a string value has a different type.
#[error("invalid value type for key `{0}`")]
InvalidValueType(String),
/// A numeric literal could not be parsed at the top level.
#[error("invalid number: {0}")]
InvalidNumber(String),
/// A scalar value inside an object could not be parsed as JSON.
#[error("invalid value for key `{0}`: {1}")]
InvalidObjectValue(String, String),
/// A character was encountered that does not fit the expected state.
#[error("unexpected character `{char}`")]
UnexpectedCharacter {
char: char,
},
}
fn add_char_into_object(
object: &mut Value,
current_status: &mut ObjectStatus,
current_char: char,
) -> Result<(), String> {
) -> Result<(), ParseError> {
match (&*object, &*current_status, current_char) {
// --- Top-level string value ---
(&Value::String(_), &ObjectStatus::StringQuoteOpen(true), '"') => {
if let Value::String(str) = object {
str.push('"');
if let Value::String(s) = object {
s.push('"');
}
if let ObjectStatus::StringQuoteOpen(ref mut escaped) = current_status {
*escaped = false;
}
*current_status = ObjectStatus::StringQuoteOpen(false);
}
(&Value::String(_), &ObjectStatus::StringQuoteOpen(false), '"') => {
*current_status = ObjectStatus::StringQuoteClose;
}
(&Value::String(_), &ObjectStatus::StringQuoteOpen(true), c) => {
if let Value::String(str) = object {
str.push('\\');
str.push(c);
if let Value::String(s) = object {
s.push('\\');
s.push(c);
}
if let ObjectStatus::StringQuoteOpen(ref mut escaped) = current_status {
*escaped = false;
}
*current_status = ObjectStatus::StringQuoteOpen(false);
}
(&Value::String(_), &ObjectStatus::StringQuoteOpen(false), '\\') => {
*current_status = ObjectStatus::StringQuoteOpen(true);
if let ObjectStatus::StringQuoteOpen(ref mut escaped) = current_status {
*escaped = true;
}
}
(&Value::String(_), &ObjectStatus::StringQuoteOpen(false), c) => {
if let Value::String(str) = object {
str.push(c);
if let Value::String(s) = object {
s.push(c);
}
}
// --- Object: key with escaped quote ---
(&Value::Object(_), &ObjectStatus::KeyQuoteOpen { escaped: true, .. }, '"') => {
if let ObjectStatus::KeyQuoteOpen {
ref mut key_so_far, ..
} = current_status
if let ObjectStatus::KeyQuoteOpen { ref mut key_so_far, ref mut escaped } =
current_status
{
key_so_far.push('"');
*current_status = ObjectStatus::KeyQuoteOpen {
key_so_far: key_so_far.clone(),
escaped: false,
};
*escaped = false;
}
}
(&Value::Object(_), &ObjectStatus::KeyQuoteOpen { escaped: false, .. }, '"') => {
if let ObjectStatus::KeyQuoteOpen { ref key_so_far, .. } = current_status {
let key = key_so_far.iter().collect::<String>();
if let ObjectStatus::KeyQuoteOpen { ref mut key_so_far, .. } = current_status {
let key = mem::take(key_so_far);
if let Value::Object(obj) = object {
obj.insert(key, Value::Null);
obj.insert(key.clone(), Value::Null);
}
*current_status = ObjectStatus::KeyQuoteClose {
key: key_so_far.clone(),
};
*current_status = ObjectStatus::KeyQuoteClose { key };
}
}
// --- Object: key with escaped other char ---
(&Value::Object(_), &ObjectStatus::KeyQuoteOpen { escaped: true, .. }, c) => {
if let ObjectStatus::KeyQuoteOpen {
ref mut key_so_far, ..
} = current_status
if let ObjectStatus::KeyQuoteOpen { ref mut key_so_far, ref mut escaped } =
current_status
{
key_so_far.push('\\');
key_so_far.push(c);
*current_status = ObjectStatus::KeyQuoteOpen {
key_so_far: key_so_far.clone(),
escaped: false,
};
*escaped = false;
}
}
(&Value::Object(_), &ObjectStatus::KeyQuoteOpen { escaped: false, .. }, '\\') => {
if let ObjectStatus::KeyQuoteOpen { ref key_so_far, .. } = current_status {
*current_status = ObjectStatus::KeyQuoteOpen {
key_so_far: key_so_far.clone(),
escaped: true,
};
if let ObjectStatus::KeyQuoteOpen { ref mut escaped, .. } = current_status {
*escaped = true;
}
}
(&Value::Object(_), &ObjectStatus::KeyQuoteOpen { escaped: false, .. }, c) => {
@@ -121,59 +137,49 @@ fn add_char_into_object(
}
}
// --- Object: value with escaped quote ---
(&Value::Object(_), &ObjectStatus::ValueQuoteOpen { escaped: true, .. }, '"') => {
if let ObjectStatus::ValueQuoteOpen { ref key, .. } = current_status {
let key_str = key.iter().collect::<String>();
if let ObjectStatus::ValueQuoteOpen { ref key, ref mut escaped } = current_status {
if let Value::Object(obj) = object {
if let Some(Value::String(value)) = obj.get_mut(&key_str) {
if let Some(Value::String(value)) = obj.get_mut(key) {
value.push('"');
}
}
*current_status = ObjectStatus::ValueQuoteOpen {
key: key.clone(),
escaped: false,
};
*escaped = false;
}
}
(&Value::Object(_), &ObjectStatus::ValueQuoteOpen { escaped: false, .. }, '"') => {
*current_status = ObjectStatus::ValueQuoteClose;
}
(&Value::Object(_), &ObjectStatus::ValueQuoteOpen { escaped: true, .. }, c) => {
if let ObjectStatus::ValueQuoteOpen { ref key, .. } = current_status {
let key_str = key.iter().collect::<String>();
if let ObjectStatus::ValueQuoteOpen { ref key, ref mut escaped } = current_status {
if let Value::Object(obj) = object {
if let Some(Value::String(value)) = obj.get_mut(&key_str) {
if let Some(Value::String(value)) = obj.get_mut(key) {
value.push('\\');
value.push(c);
}
}
*current_status = ObjectStatus::ValueQuoteOpen {
key: key.clone(),
escaped: false,
};
*escaped = false;
}
}
(&Value::Object(_), &ObjectStatus::ValueQuoteOpen { escaped: false, .. }, '\\') => {
if let ObjectStatus::ValueQuoteOpen { ref key, .. } = current_status {
*current_status = ObjectStatus::ValueQuoteOpen {
key: key.clone(),
escaped: true,
};
if let ObjectStatus::ValueQuoteOpen { ref mut escaped, .. } = current_status {
*escaped = true;
}
}
(&Value::Object(_), &ObjectStatus::ValueQuoteOpen { escaped: false, .. }, c) => {
if let ObjectStatus::ValueQuoteOpen { ref key, .. } = current_status {
let key_str = key.iter().collect::<String>();
if let Value::Object(obj) = object {
if let Some(Value::String(value)) = obj.get_mut(&key_str) {
if let Some(Value::String(value)) = obj.get_mut(key) {
value.push(c);
} else {
return Err(format!("Invalid value type for key {}", key_str));
return Err(ParseError::InvalidValueType(key.clone()));
}
}
}
}
// --- Top-level init ---
(&Value::Null, &ObjectStatus::Ready, '"') => {
*object = json!("");
*current_status = ObjectStatus::StringQuoteOpen(false);
@@ -186,7 +192,7 @@ fn add_char_into_object(
(&Value::Null, &ObjectStatus::Ready, 't') => {
*object = json!(true);
*current_status = ObjectStatus::Scalar {
value_so_far: vec!['t'],
value_so_far: "t".into(),
};
}
(&Value::Bool(true), &ObjectStatus::Scalar { .. }, 'r') => {
@@ -194,7 +200,7 @@ fn add_char_into_object(
ref mut value_so_far,
} = current_status
{
if *value_so_far == vec!['t'] {
if *value_so_far == "t" {
value_so_far.push('r');
}
}
@@ -204,19 +210,21 @@ fn add_char_into_object(
ref mut value_so_far,
} = current_status
{
if *value_so_far == vec!['t', 'r'] {
if *value_so_far == "tr" {
value_so_far.push('u');
}
}
}
(&Value::Bool(true), &ObjectStatus::Scalar { .. }, 'e') => {
(&Value::Bool(true), &ObjectStatus::Scalar { .. }, 'e')
| (&Value::Bool(false), &ObjectStatus::Scalar { .. }, 'e')
| (&Value::Object(_), &ObjectStatus::ValueQuoteClose, '}') => {
*current_status = ObjectStatus::Closed;
}
(&Value::Null, &ObjectStatus::Ready, 'f') => {
*object = json!(false);
*current_status = ObjectStatus::Scalar {
value_so_far: vec!['f'],
value_so_far: "f".into(),
};
}
(&Value::Bool(false), &ObjectStatus::Scalar { .. }, 'a') => {
@@ -224,7 +232,7 @@ fn add_char_into_object(
ref mut value_so_far,
} = current_status
{
if *value_so_far == vec!['f'] {
if *value_so_far == "f" {
value_so_far.push('a');
}
}
@@ -234,7 +242,7 @@ fn add_char_into_object(
ref mut value_so_far,
} = current_status
{
if *value_so_far == vec!['f', 'a'] {
if *value_so_far == "fa" {
value_so_far.push('l');
}
}
@@ -244,19 +252,16 @@ fn add_char_into_object(
ref mut value_so_far,
} = current_status
{
if *value_so_far == vec!['f', 'a', 'l'] {
if *value_so_far == "fal" {
value_so_far.push('s');
}
}
}
(&Value::Bool(false), &ObjectStatus::Scalar { .. }, 'e') => {
*current_status = ObjectStatus::Closed;
}
(&Value::Null, &ObjectStatus::Ready, 'n') => {
*object = json!(null);
*current_status = ObjectStatus::Scalar {
value_so_far: vec!['n'],
value_so_far: "n".into(),
};
}
(&Value::Null, &ObjectStatus::Scalar { .. }, 'u') => {
@@ -264,7 +269,7 @@ fn add_char_into_object(
ref mut value_so_far,
} = current_status
{
if *value_so_far == vec!['n'] {
if *value_so_far == "n" {
value_so_far.push('u');
}
}
@@ -274,24 +279,27 @@ fn add_char_into_object(
ref mut value_so_far,
} = current_status
{
if *value_so_far == vec!['n', 'u'] {
if *value_so_far == "nu" {
value_so_far.push('l');
} else if *value_so_far == vec!['n', 'u', 'l'] {
} else if *value_so_far == "nul" {
*current_status = ObjectStatus::Closed;
}
}
}
// --- Numbers ---
(&Value::Null, &ObjectStatus::Ready, c @ '0'..='9') => {
*object = Value::Number(c.to_digit(10).unwrap().into());
if let Some(digit) = c.to_digit(10) {
*object = Value::Number(digit.into());
}
*current_status = ObjectStatus::ScalarNumber {
value_so_far: vec![c],
value_so_far: c.to_string(),
};
}
(&Value::Null, &ObjectStatus::Ready, '-') => {
*object = Value::Number(0.into());
*current_status = ObjectStatus::ScalarNumber {
value_so_far: vec!['-'],
value_so_far: "-".into(),
};
}
(&Value::Number(_), &ObjectStatus::ScalarNumber { .. }, c @ '0'..='9') => {
@@ -301,22 +309,22 @@ fn add_char_into_object(
{
value_so_far.push(c);
if let Value::Number(ref mut num) = object {
if value_so_far.contains(&'.') {
let parsed_number = value_so_far
.iter()
.collect::<String>()
.parse::<f64>()
.unwrap();
if let Some(json_number) = serde_json::Number::from_f64(parsed_number) {
if value_so_far.contains('.') {
let parsed: f64 = value_so_far.parse().map_err(|e| {
ParseError::InvalidNumber(format!(
"invalid float: `{value_so_far}` ({e})"
))
})?;
if let Some(json_number) = serde_json::Number::from_f64(parsed) {
*num = json_number;
}
} else {
let parsed_number = value_so_far
.iter()
.collect::<String>()
.parse::<i64>()
.unwrap();
*num = parsed_number.into();
let parsed: i64 = value_so_far.parse().map_err(|e| {
ParseError::InvalidNumber(format!(
"invalid integer: `{value_so_far}` ({e})"
))
})?;
*num = parsed.into();
}
}
}
@@ -330,53 +338,58 @@ fn add_char_into_object(
}
}
// --- Object structure ---
(&Value::Object(_), &ObjectStatus::StartProperty, '"') => {
*current_status = ObjectStatus::KeyQuoteOpen {
key_so_far: vec![],
key_so_far: String::new(),
escaped: false,
};
}
(&Value::Object(_), &ObjectStatus::KeyQuoteClose { .. }, ':') => {
if let ObjectStatus::KeyQuoteClose { ref key } = current_status {
*current_status = ObjectStatus::Colon { key: key.clone() };
if let ObjectStatus::KeyQuoteClose { ref mut key } = current_status {
let key = mem::take(key);
*current_status = ObjectStatus::Colon { key };
}
}
(&Value::Object(_), &ObjectStatus::Colon { .. }, ' ' | '\n') => {}
(&Value::Object(_), &ObjectStatus::Colon { .. }, ' ' | '\n' | '\t' | '\r') => {}
(&Value::Object(_), &ObjectStatus::Colon { .. }, '"') => {
if let ObjectStatus::Colon { ref key } = current_status {
let key_str = key.iter().collect::<String>();
if let ObjectStatus::Colon { ref mut key } = current_status {
let key_str = mem::take(key);
if let Value::Object(obj) = object {
obj.insert(key_str, json!(""));
obj.insert(key_str.clone(), json!(""));
}
*current_status = ObjectStatus::ValueQuoteOpen {
key: key.clone(),
key: key_str,
escaped: false,
};
}
}
(&Value::Object(_), &ObjectStatus::Colon { .. }, char) => {
if let ObjectStatus::Colon { ref key } = current_status {
if let ObjectStatus::Colon { ref mut key } = current_status {
let key = mem::take(key);
*current_status = ObjectStatus::ValueScalar {
key: key.clone(),
value_so_far: vec![char],
key,
value_so_far: char.to_string(),
};
}
}
(&Value::Object(_), &ObjectStatus::ValueScalar { .. }, ',') => {
if let ObjectStatus::ValueScalar {
ref key,
ref value_so_far,
ref mut key,
ref mut value_so_far,
} = current_status
{
let key_str = key.iter().collect::<String>();
let value_str = value_so_far.iter().collect::<String>();
let key = mem::take(key);
let value_str = mem::take(value_so_far);
if let Value::Object(obj) = object {
match value_str.parse::<Value>() {
Ok(value) => {
obj.insert(key_str, value);
obj.insert(key, value);
}
Err(e) => {
return Err(ParseError::InvalidObjectValue(key, e.to_string()));
}
Err(e) => return Err(format!("Invalid value for key {}: {}", key_str, e)),
}
}
*current_status = ObjectStatus::StartProperty;
@@ -384,18 +397,20 @@ fn add_char_into_object(
}
(&Value::Object(_), &ObjectStatus::ValueScalar { .. }, '}') => {
if let ObjectStatus::ValueScalar {
ref key,
ref value_so_far,
ref mut key,
ref mut value_so_far,
} = current_status
{
let key_str = key.iter().collect::<String>();
let value_str = value_so_far.iter().collect::<String>();
let key = mem::take(key);
let value_str = mem::take(value_so_far);
if let Value::Object(obj) = object {
match value_str.parse::<Value>() {
Ok(value) => {
obj.insert(key_str, value);
obj.insert(key, value);
}
Err(e) => {
return Err(ParseError::InvalidObjectValue(key, e.to_string()));
}
Err(e) => return Err(format!("Invalid value for key {}: {}", key_str, e)),
}
}
*current_status = ObjectStatus::Closed;
@@ -414,54 +429,54 @@ fn add_char_into_object(
(&Value::Object(_), &ObjectStatus::ValueQuoteClose, ',') => {
*current_status = ObjectStatus::StartProperty;
}
(&Value::Object(_), &ObjectStatus::ValueQuoteClose, '}') => {
*current_status = ObjectStatus::Closed;
}
(_, _, ' ' | '\n' | '\t' | '\r') => {}
(_, _, ' ' | '\n') => {}
(val, st, c) => {
return Err(format!(
"Invalid character {} status: {:?} value: {:?}",
c, st, val
));
(_, _, c) => {
return Err(ParseError::UnexpectedCharacter { char: c });
}
}
Ok(())
}
#[cfg(debug_assertions)]
pub fn parse_stream(json_string: &str) -> Result<Value, String> {
/// Parse a complete JSON string in one shot.
///
/// Processes the input character-by-character through the streaming parser state machine.
///
/// # Errors
///
/// Returns [`ParseError`] if the input contains invalid JSON or unexpected characters
/// for the current parser state.
#[must_use]
pub fn parse_stream(json_string: &str) -> Result<Value, ParseError> {
let mut out: Value = Value::Null;
let mut current_status = ObjectStatus::Ready;
for current_char in json_string.chars() {
println!(
"variables: {:?} {:?} {:?}",
out,
current_status.clone(),
current_char.to_string()
);
add_char_into_object(&mut out, &mut current_status, current_char)?
add_char_into_object(&mut out, &mut current_status, current_char)?;
}
Ok(out)
}
#[cfg(not(debug_assertions))]
pub fn parse_stream(json_string: &str) -> Result<Value, String> {
let mut out: Value = Value::Null;
let mut current_status = ObjectStatus::Ready;
for current_char in json_string.chars() {
if let Err(e) = add_char_into_object(&mut out, &mut current_status, current_char) {
return Err(e);
}
}
return Ok(out);
}
/// An incremental streaming JSON parser that processes one character at a time.
///
/// Create via [`JsonStreamParser::new()`], feed characters with [`add_char`](Self::add_char),
/// and retrieve the result with [`result`](Self::result).
///
/// # Example
///
/// ```
/// # use json_stream_parser::JsonStreamParser;
/// let mut parser = JsonStreamParser::new();
/// for c in r#"{"key": "value"}"#.chars() {
/// parser.add_char(c).unwrap();
/// }
/// let result = parser.result();
/// ```
#[derive(Debug)]
pub struct JsonStreamParser {
object: Value,
current_status: ObjectStatus,
}
impl Default for JsonStreamParser {
fn default() -> Self {
Self::new()
@@ -469,16 +484,27 @@ impl Default for JsonStreamParser {
}
impl JsonStreamParser {
/// Create a new streaming parser in the initial state.
#[must_use]
pub fn new() -> JsonStreamParser {
JsonStreamParser {
object: Value::Null,
current_status: ObjectStatus::Ready,
}
}
pub fn add_char(&mut self, current_char: char) -> Result<(), String> {
/// Feed one character into the parser.
///
/// # Errors
///
/// Returns [`ParseError`] if the character is invalid for the current state.
pub fn add_char(&mut self, current_char: char) -> Result<(), ParseError> {
add_char_into_object(&mut self.object, &mut self.current_status, current_char)
}
pub fn get_result(&self) -> &Value {
/// Borrow the current parsed value.
#[must_use]
pub fn result(&self) -> &Value {
&self.object
}
}
@@ -487,6 +513,7 @@ macro_rules! param_test {
($($name:ident: $string:expr, $value:expr)*) => {
$(
mod $name {
#![allow(clippy::unwrap_used, clippy::unreadable_literal)]
#[allow(unused_imports)]
use super::{parse_stream, JsonStreamParser};
#[allow(unused_imports)]
@@ -496,13 +523,13 @@ macro_rules! param_test {
fn simple() {
let string: &str = $string;
let value: Value = $value;
let result = parse_stream(&string);
let result = parse_stream(string);
assert_eq!(result.unwrap(), value);
let mut parser = JsonStreamParser::new();
for c in string.chars() {
parser.add_char(c).unwrap();
}
assert_eq!(parser.get_result(), &value);
assert_eq!(parser.result(), &value);
}
#[test]
@@ -517,7 +544,7 @@ macro_rules! param_test {
for c in raw_json.chars() {
parser.add_char(c).unwrap();
}
assert_eq!(parser.get_result(), &expected);
assert_eq!(parser.result(), &expected);
}
#[test]
@@ -532,7 +559,7 @@ macro_rules! param_test {
for c in raw_json.chars() {
parser.add_char(c).unwrap();
}
assert_eq!(parser.get_result(), &expected);
assert_eq!(parser.result(), &expected);
}
#[test]
@@ -547,7 +574,7 @@ macro_rules! param_test {
for c in raw_json.chars() {
parser.add_char(c).unwrap();
}
assert_eq!(parser.get_result(), &expected);
assert_eq!(parser.result(), &expected);
}
#[test]
@@ -562,7 +589,7 @@ macro_rules! param_test {
for c in raw_json.chars() {
parser.add_char(c).unwrap();
}
assert_eq!(parser.get_result(), &expected);
assert_eq!(parser.result(), &expected);
}
#[test]
@@ -580,7 +607,7 @@ macro_rules! param_test {
for c in raw_json.chars() {
parser.add_char(c).unwrap();
}
assert_eq!(parser.get_result(), &expected);
assert_eq!(parser.result(), &expected);
}
#[test]
@@ -596,7 +623,7 @@ macro_rules! param_test {
for c in raw_json.chars() {
assert!(parser.add_char(c).is_ok(), "Add char error");
}
assert_eq!(parser.get_result(), &expected);
assert_eq!(parser.result(), &expected);
}
}
)*
@@ -607,18 +634,18 @@ param_test! {
null: r#"null"#, Value::Null
true_value: r#"true"#, Value::Bool(true)
false_value: r#"false"#, Value::Bool(false)
empty_string: r#""""#, Value::String("".to_string())
empty_string: r#""""#, Value::String(String::new())
single_character_string: r#""a""#, Value::String("a".to_string())
string_with_spaces: r#""a b c""#, Value::String("a b c".to_string())
string_with_space_at_end: r#""a b c ""#, Value::String("a b c ".to_string())
string_with_space_at_start: r#"" a b c""#, Value::String(" a b c".to_string())
string_with_space_at_start_and_end: r#"" a b c ""#, Value::String(" a b c ".to_string())
number: r#"1234567890"#, Value::Number(1234567890.into())
number: r#"1234567890"#, Value::Number(1_234_567_890.into())
single_digit_number: r#"1"#, Value::Number(1.into())
number_with_spaces_at_start: r#" 1234567890"#, Value::Number(1234567890.into())
number_with_spaces_at_end: r#"1234567890 "#, Value::Number(1234567890.into())
number_with_spaces_at_start_and_end: r#" 1234567890 "#, Value::Number(1234567890.into())
negative_number: r#"-1234567890"#, Value::Number((-1234567890).into())
number_with_spaces_at_start: r#" 1234567890"#, Value::Number(1_234_567_890.into())
number_with_spaces_at_end: r#"1234567890 "#, Value::Number(1_234_567_890.into())
number_with_spaces_at_start_and_end: r#" 1234567890 "#, Value::Number(1_234_567_890.into())
negative_number: r#"-1234567890"#, Value::Number((-1_234_567_890i64).into())
negative_single_digit_number: r#"-1"#, Value::Number((-1).into())
zero: r#"0"#, Value::Number(0.into())
float: r#"123.456"#, Value::Number(serde_json::Number::from_f64(123.456).unwrap())