[−][src]Enum sj::Value
A value
Usage
Formatting as JSON string
-
To format as compacted JSON string, you can use
to_string()
. -
To format with default tab width (
4
), you can use#
(viaFormatter
):format!( "{:#}", sj::parse(&mut &br#"["test"]"#[..]).unwrap(), );
-
You can set tab width (required) and tab level (optional):
format!( "{:width$.level$}", sj::parse(&mut &br#"["test"]"#[..]).unwrap(), width=4, level=0, );
Writing as JSON string to Write
You can use write()
or write_nicely()
.
Converting Rust types to Value
You can make a value directly from some data types such as String
, bool
. Or you can use
implementations of From
trait.
Extracting data from Value
You can use match
expression directly on this value. Or you can use implementations of TryFrom
trait.
About TryFrom
implementations:
Variants
String(String)
Number(Number)
Boolean(bool)
Methods
impl Value
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pub fn write<W>(&self, stream: &mut W) -> IoResult<()> where
W: Write,
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W: Write,
Writes this value as compacted JSON string to a stream
Notes
- The stream is used as-is. For better performance, you should wrap your stream inside a
BufWriter
. - This function does not flush the stream when done.
pub fn write_nicely<W>(
&self,
tab: Option<usize>,
stream: &mut W
) -> IoResult<()> where
W: Write,
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&self,
tab: Option<usize>,
stream: &mut W
) -> IoResult<()> where
W: Write,
Writes this value as nicely formatted JSON string to a stream
Notes
- If you don't provide tab size, default (
4
) will be used. - The stream is used as-is. For better performance, you should wrap your stream inside a
BufWriter
. - This function does not flush the stream when done.
Trait Implementations
impl From<String> for Value
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impl From<Number> for Value
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impl From<bool> for Value
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impl From<BTreeMap<String, Value>> for Value
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impl From<Vec<Value>> for Value
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impl<T> From<Option<T>> for Value where
T: Into<Value>,
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T: Into<Value>,
impl From<i8> for Value
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impl From<i16> for Value
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impl From<i32> for Value
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impl From<i64> for Value
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impl From<i128> for Value
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impl From<isize> for Value
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impl From<u8> for Value
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impl From<u16> for Value
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impl From<u32> for Value
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impl From<u64> for Value
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impl From<u128> for Value
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impl From<usize> for Value
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impl From<f32> for Value
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impl From<f64> for Value
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impl Debug for Value
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impl Display for Value
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impl TryFrom<Value> for String
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type Error = Error
The type returned in the event of a conversion error.
fn try_from(value: Value) -> Result<Self, Self::Error>
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impl<'_> TryFrom<&'_ Value> for bool
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type Error = Error
The type returned in the event of a conversion error.
fn try_from(value: &Value) -> Result<Self, Self::Error>
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impl TryFrom<Value> for bool
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type Error = Error
The type returned in the event of a conversion error.
fn try_from(value: Value) -> Result<Self, Self::Error>
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impl TryFrom<Value> for BTreeMap<String, Value>
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type Error = Error
The type returned in the event of a conversion error.
fn try_from(value: Value) -> Result<Self, Self::Error>
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impl TryFrom<Value> for Vec<Value>
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type Error = Error
The type returned in the event of a conversion error.
fn try_from(value: Value) -> Result<Self, Self::Error>
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impl<'_> TryFrom<&'_ Value> for i8
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type Error = Error
The type returned in the event of a conversion error.
fn try_from(value: &Value) -> Result<Self, Self::Error>
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impl TryFrom<Value> for i8
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type Error = Error
The type returned in the event of a conversion error.
fn try_from(value: Value) -> Result<Self, Self::Error>
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impl<'_> TryFrom<&'_ Value> for i16
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type Error = Error
The type returned in the event of a conversion error.
fn try_from(value: &Value) -> Result<Self, Self::Error>
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impl TryFrom<Value> for i16
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type Error = Error
The type returned in the event of a conversion error.
fn try_from(value: Value) -> Result<Self, Self::Error>
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impl<'_> TryFrom<&'_ Value> for i32
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type Error = Error
The type returned in the event of a conversion error.
fn try_from(value: &Value) -> Result<Self, Self::Error>
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impl TryFrom<Value> for i32
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type Error = Error
The type returned in the event of a conversion error.
fn try_from(value: Value) -> Result<Self, Self::Error>
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impl<'_> TryFrom<&'_ Value> for i64
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type Error = Error
The type returned in the event of a conversion error.
fn try_from(value: &Value) -> Result<Self, Self::Error>
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impl TryFrom<Value> for i64
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type Error = Error
The type returned in the event of a conversion error.
fn try_from(value: Value) -> Result<Self, Self::Error>
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impl<'_> TryFrom<&'_ Value> for i128
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type Error = Error
The type returned in the event of a conversion error.
fn try_from(value: &Value) -> Result<Self, Self::Error>
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impl TryFrom<Value> for i128
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type Error = Error
The type returned in the event of a conversion error.
fn try_from(value: Value) -> Result<Self, Self::Error>
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impl<'_> TryFrom<&'_ Value> for isize
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type Error = Error
The type returned in the event of a conversion error.
fn try_from(value: &Value) -> Result<Self, Self::Error>
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impl TryFrom<Value> for isize
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type Error = Error
The type returned in the event of a conversion error.
fn try_from(value: Value) -> Result<Self, Self::Error>
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impl<'_> TryFrom<&'_ Value> for u8
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type Error = Error
The type returned in the event of a conversion error.
fn try_from(value: &Value) -> Result<Self, Self::Error>
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impl TryFrom<Value> for u8
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type Error = Error
The type returned in the event of a conversion error.
fn try_from(value: Value) -> Result<Self, Self::Error>
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impl<'_> TryFrom<&'_ Value> for u16
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type Error = Error
The type returned in the event of a conversion error.
fn try_from(value: &Value) -> Result<Self, Self::Error>
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impl TryFrom<Value> for u16
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type Error = Error
The type returned in the event of a conversion error.
fn try_from(value: Value) -> Result<Self, Self::Error>
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impl<'_> TryFrom<&'_ Value> for u32
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type Error = Error
The type returned in the event of a conversion error.
fn try_from(value: &Value) -> Result<Self, Self::Error>
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impl TryFrom<Value> for u32
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type Error = Error
The type returned in the event of a conversion error.
fn try_from(value: Value) -> Result<Self, Self::Error>
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impl<'_> TryFrom<&'_ Value> for u64
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type Error = Error
The type returned in the event of a conversion error.
fn try_from(value: &Value) -> Result<Self, Self::Error>
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impl TryFrom<Value> for u64
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type Error = Error
The type returned in the event of a conversion error.
fn try_from(value: Value) -> Result<Self, Self::Error>
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impl<'_> TryFrom<&'_ Value> for u128
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type Error = Error
The type returned in the event of a conversion error.
fn try_from(value: &Value) -> Result<Self, Self::Error>
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impl TryFrom<Value> for u128
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type Error = Error
The type returned in the event of a conversion error.
fn try_from(value: Value) -> Result<Self, Self::Error>
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impl<'_> TryFrom<&'_ Value> for usize
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type Error = Error
The type returned in the event of a conversion error.
fn try_from(value: &Value) -> Result<Self, Self::Error>
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impl TryFrom<Value> for usize
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type Error = Error
The type returned in the event of a conversion error.
fn try_from(value: Value) -> Result<Self, Self::Error>
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impl<'_> TryFrom<&'_ Value> for f32
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type Error = Error
The type returned in the event of a conversion error.
fn try_from(value: &Value) -> Result<Self, Self::Error>
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impl TryFrom<Value> for f32
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type Error = Error
The type returned in the event of a conversion error.
fn try_from(value: Value) -> Result<Self, Self::Error>
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impl<'_> TryFrom<&'_ Value> for f64
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type Error = Error
The type returned in the event of a conversion error.
fn try_from(value: &Value) -> Result<Self, Self::Error>
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impl TryFrom<Value> for f64
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type Error = Error
The type returned in the event of a conversion error.
fn try_from(value: Value) -> Result<Self, Self::Error>
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impl FromIterator<(String, Value)> for Value
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impl FromIterator<Value> for Value
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fn from_iter<T>(iter: T) -> Self where
T: IntoIterator<Item = Value>,
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T: IntoIterator<Item = Value>,
Auto Trait Implementations
impl Unpin for Value
impl Send for Value
impl Sync for Value
impl UnwindSafe for Value
impl RefUnwindSafe for Value
Blanket Implementations
impl<T> From<T> for T
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impl<T, U> TryFrom<U> for T where
U: Into<T>,
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U: Into<T>,
type Error = !
The type returned in the event of a conversion error.
fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
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impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,
type Error = <U as TryFrom<T>>::Error
The type returned in the event of a conversion error.
fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>
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impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
fn borrow_mut(&mut self) -> &mut T
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impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,
impl<T> ToString for T where
T: Display + ?Sized,
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T: Display + ?Sized,