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/*! JSON support for `sval`. This library is no-std, so it can be run in environments that don't have access to an allocator. # Getting started Add `sval_json` to your `Cargo.toml`: ```toml,ignore [dependencies.sval_json] version = "1.0.0-alpha.2" ``` # Writing JSON to `fmt::Write` ```no_run # #[cfg(not(feature = "std"))] # fn main() {} # #[cfg(feature = "std")] # fn main() -> Result<(), Box<dyn std::error::Error>> { let json = sval_json::to_fmt(MyWrite, 42)?; # Ok(()) # } # use std::fmt::{self, Write}; # struct MyWrite; # impl Write for MyWrite { # fn write_str(&mut self, _: &str) -> fmt::Result { # Ok(()) # } # } ``` # Writing JSON to a `String` Add the `std` feature to your `Cargo.toml` to enable writing to a `String`: ```toml,no_run [dependencies.sval_json] features = ["std"] ``` ```no_run # #[cfg(not(feature = "std"))] # fn main() {} # #[cfg(feature = "std")] # fn main() -> Result<(), Box<dyn std::error::Error>> { let json = sval_json::to_string(42)?; # Ok(()) # } ``` # Writing JSON to a `io::Write` Add the `std` feature to your `Cargo.toml` to enable writing to an `io::Write`: ```toml,no_run [dependencies.sval_json] features = ["std"] ``` ```no_run # #[cfg(not(feature = "std"))] # fn main() {} # #[cfg(feature = "std")] # fn main() -> Result<(), Box<dyn std::error::Error>> { # use std::io::{self, Write}; # struct MyWrite; # impl Write for MyWrite { # fn write(&mut self, _: &[u8]) -> io::Result<usize> { # Ok(0) # } # fn flush(&mut self) -> io::Result<()> { Ok(()) } # } let json = sval_json::to_writer(MyWrite, 42)?; # Ok(()) # } ``` */ #![doc(html_root_url = "https://docs.rs/sval_json/1.0.0-alpha.2")] #![no_std] #[cfg(feature = "std")] extern crate std; #[cfg(not(feature = "std"))] extern crate core as std; mod fmt; pub use self::fmt::{ to_fmt, Formatter, }; #[cfg(feature = "std")] mod std_support; #[cfg(feature = "std")] pub use self::std_support::{ to_string, to_writer, Writer, }; /** An error attempting to end a JSON stream. The original stream can be pulled out, or this type can be treated as a standard error. */ pub struct End<T> { /** The original stream. */ pub stream: T, err: sval::Error, _private: (), } impl<T> End<T> { fn new(err: sval::Error, stream: T) -> Self { End { err, stream, _private: (), } } } impl<T> crate::std::fmt::Debug for End<T> { fn fmt(&self, f: &mut crate::std::fmt::Formatter) -> crate::std::fmt::Result { f.debug_struct("End").field("err", &self.err).finish() } } impl<T> crate::std::fmt::Display for End<T> { fn fmt(&self, f: &mut crate::std::fmt::Formatter) -> crate::std::fmt::Result { write!( f, "failed to take the inner JSON writer because it is invalid" ) } }