Rollup merge of #67253 - elichai:2019-12-fmt, r=Dylan-DPC
Add more delegations to the fmt docs and add doctests HI, this is a continuation to #67021 I replaced the `Debug` example with one that use the `Debug*` helpers so that padding etc will work too. I also added asserts for the doctests as @RalfJung asked :) The only thing I left with the `write!` macro is the `Display` example as I didn't know if there's a better way to do that. r? @QuietMisdreavus
This commit is contained in:
Mark Rousskov
GitHub
commit
939beb58d3
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@ -63,7 +63,7 @@ pub mod rt {
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///
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/// let pythagorean_triple = Triangle { a: 3.0, b: 4.0, c: 5.0 };
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///
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/// println!("{}", pythagorean_triple);
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/// assert_eq!(format!("{}", pythagorean_triple), "(3, 4, 5)");
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/// ```
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#[stable(feature = "rust1", since = "1.0.0")]
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pub type Result = result::Result<(), Error>;
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@ -440,7 +440,7 @@ impl Display for Arguments<'_> {
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///
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/// let origin = Point { x: 0, y: 0 };
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///
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/// println!("The origin is: {:?}", origin);
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/// assert_eq!(format!("The origin is: {:?}", origin), "The origin is: Point { x: 0, y: 0 }");
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/// ```
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///
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/// Manually implementing:
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@ -455,28 +455,25 @@ impl Display for Arguments<'_> {
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///
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/// impl fmt::Debug for Point {
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/// fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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/// write!(f, "Point {{ x: {}, y: {} }}", self.x, self.y)
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/// f.debug_struct("Point")
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/// .field("x", &self.x)
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/// .field("y", &self.y)
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/// .finish()
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/// }
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/// }
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///
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/// let origin = Point { x: 0, y: 0 };
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///
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/// println!("The origin is: {:?}", origin);
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/// assert_eq!(format!("The origin is: {:?}", origin), "The origin is: Point { x: 0, y: 0 }");
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/// ```
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///
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/// This outputs:
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///
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/// ```text
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/// The origin is: Point { x: 0, y: 0 }
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/// ```
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///
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/// There are a number of `debug_*` methods on [`Formatter`] to help you with manual
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/// implementations, such as [`debug_struct`][debug_struct].
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/// There are a number of helper methods on the [`Formatter`] struct to help you with manual
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/// implementations, such as [`debug_struct`].
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///
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/// `Debug` implementations using either `derive` or the debug builder API
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/// on [`Formatter`] support pretty-printing using the alternate flag: `{:#?}`.
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///
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/// [debug_struct]: ../../std/fmt/struct.Formatter.html#method.debug_struct
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/// [`debug_struct`]: ../../std/fmt/struct.Formatter.html#method.debug_struct
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/// [`Formatter`]: ../../std/fmt/struct.Formatter.html
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///
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/// Pretty-printing with `#?`:
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@ -490,17 +487,13 @@ impl Display for Arguments<'_> {
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///
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/// let origin = Point { x: 0, y: 0 };
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///
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/// println!("The origin is: {:#?}", origin);
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/// ```
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///
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/// This outputs:
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///
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/// ```text
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/// The origin is: Point {
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/// assert_eq!(format!("The origin is: {:#?}", origin),
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/// "The origin is: Point {
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/// x: 0,
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/// y: 0
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/// }
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/// y: 0,
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/// }");
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/// ```
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#[stable(feature = "rust1", since = "1.0.0")]
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#[rustc_on_unimplemented(
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on(
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@ -528,12 +521,20 @@ pub trait Debug {
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///
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/// impl fmt::Debug for Position {
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/// fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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/// write!(f, "({:?}, {:?})", self.longitude, self.latitude)
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/// f.debug_tuple("")
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/// .field(&self.longitude)
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/// .field(&self.latitude)
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/// .finish()
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/// }
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/// }
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///
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/// assert_eq!("(1.987, 2.983)".to_owned(),
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/// format!("{:?}", Position { longitude: 1.987, latitude: 2.983, }));
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/// let position = Position { longitude: 1.987, latitude: 2.983 };
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/// assert_eq!(format!("{:?}", position), "(1.987, 2.983)");
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///
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/// assert_eq!(format!("{:#?}", position), "(
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/// 1.987,
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/// 2.983,
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/// )");
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/// ```
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#[stable(feature = "rust1", since = "1.0.0")]
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fn fmt(&self, f: &mut Formatter<'_>) -> Result;
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@ -584,7 +585,7 @@ pub use macros::Debug;
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///
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/// let origin = Point { x: 0, y: 0 };
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///
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/// println!("The origin is: {}", origin);
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/// assert_eq!(format!("The origin is: {}", origin), "The origin is: (0, 0)");
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/// ```
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#[rustc_on_unimplemented(
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on(
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@ -618,7 +619,7 @@ pub trait Display {
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/// }
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/// }
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///
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/// assert_eq!("(1.987, 2.983)".to_owned(),
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/// assert_eq!("(1.987, 2.983)",
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/// format!("{}", Position { longitude: 1.987, latitude: 2.983, }));
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/// ```
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#[stable(feature = "rust1", since = "1.0.0")]
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@ -668,7 +669,9 @@ pub trait Display {
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///
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/// let l = Length(9);
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///
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/// println!("l as octal is: {:o}", l);
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/// assert_eq!(format!("l as octal is: {:o}", l), "l as octal is: 11");
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///
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/// assert_eq!(format!("l as octal is: {:#06o}", l), "l as octal is: 0o0011");
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/// ```
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#[stable(feature = "rust1", since = "1.0.0")]
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pub trait Octal {
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@ -718,7 +721,12 @@ pub trait Octal {
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///
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/// let l = Length(107);
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///
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/// println!("l as binary is: {:b}", l);
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/// assert_eq!(format!("l as binary is: {:b}", l), "l as binary is: 1101011");
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///
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/// assert_eq!(
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/// format!("l as binary is: {:#032b}", l),
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/// "l as binary is: 0b000000000000000000000001101011"
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/// );
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/// ```
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///
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/// [module]: ../../std/fmt/index.html
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@ -777,7 +785,9 @@ pub trait Binary {
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///
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/// let l = Length(9);
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///
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/// println!("l as hex is: {:x}", l);
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/// assert_eq!(format!("l as hex is: {:x}", l), "l as hex is: 9");
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///
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/// assert_eq!(format!("l as hex is: {:#010x}", l), "l as hex is: 0x00000009");
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/// ```
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#[stable(feature = "rust1", since = "1.0.0")]
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pub trait LowerHex {
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@ -828,9 +838,11 @@ pub trait LowerHex {
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/// }
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/// }
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///
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/// let l = Length(9);
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/// let l = Length(i32::max_value());
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///
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/// println!("l as hex is: {:X}", l);
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/// assert_eq!(format!("l as hex is: {:X}", l), "l as hex is: 7FFFFFFF");
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///
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/// assert_eq!(format!("l as hex is: {:#010X}", l), "l as hex is: 0x7FFFFFFF");
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/// ```
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#[stable(feature = "rust1", since = "1.0.0")]
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pub trait UpperHex {
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@ -877,6 +889,10 @@ pub trait UpperHex {
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/// let l = Length(42);
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///
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/// println!("l is in memory here: {:p}", l);
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///
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/// let l_ptr = format!("{:018p}", l);
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/// assert_eq!(l_ptr.len(), 18);
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/// assert_eq!(&l_ptr[..2], "0x");
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/// ```
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#[stable(feature = "rust1", since = "1.0.0")]
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pub trait Pointer {
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@ -912,14 +928,22 @@ pub trait Pointer {
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///
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/// impl fmt::LowerExp for Length {
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/// fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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/// let val = self.0;
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/// write!(f, "{}e1", val / 10)
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/// let val = f64::from(self.0);
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/// fmt::LowerExp::fmt(&val, f) // delegate to f64's implementation
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/// }
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/// }
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///
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/// let l = Length(100);
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///
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/// println!("l in scientific notation is: {:e}", l);
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/// assert_eq!(
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/// format!("l in scientific notation is: {:e}", l),
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/// "l in scientific notation is: 1e2"
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/// );
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///
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/// assert_eq!(
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/// format!("l in scientific notation is: {:05e}", l),
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/// "l in scientific notation is: 001e2"
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/// );
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/// ```
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#[stable(feature = "rust1", since = "1.0.0")]
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pub trait LowerExp {
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@ -955,14 +979,22 @@ pub trait LowerExp {
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///
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/// impl fmt::UpperExp for Length {
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/// fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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/// let val = self.0;
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/// write!(f, "{}E1", val / 10)
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/// let val = f64::from(self.0);
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/// fmt::UpperExp::fmt(&val, f) // delegate to f64's implementation
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/// }
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/// }
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///
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/// let l = Length(100);
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///
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/// println!("l in scientific notation is: {:E}", l);
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/// assert_eq!(
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/// format!("l in scientific notation is: {:E}", l),
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/// "l in scientific notation is: 1E2"
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/// );
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///
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/// assert_eq!(
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/// format!("l in scientific notation is: {:05E}", l),
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/// "l in scientific notation is: 001E2"
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/// );
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/// ```
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#[stable(feature = "rust1", since = "1.0.0")]
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pub trait UpperExp {
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@ -1807,8 +1839,7 @@ impl<'a> Formatter<'a> {
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/// }
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/// }
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///
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/// // prints "[10, 11]"
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/// println!("{:?}", Foo(vec![10, 11]));
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/// assert_eq!(format!("{:?}", Foo(vec![10, 11])), "[10, 11]");
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/// ```
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#[stable(feature = "debug_builders", since = "1.2.0")]
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pub fn debug_list<'b>(&'b mut self) -> DebugList<'b, 'a> {
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@ -1831,8 +1862,7 @@ impl<'a> Formatter<'a> {
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/// }
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/// }
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///
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/// // prints "{10, 11}"
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/// println!("{:?}", Foo(vec![10, 11]));
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/// assert_eq!(format!("{:?}", Foo(vec![10, 11])), "{10, 11}");
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/// ```
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///
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/// [`format_args!`]: ../../std/macro.format_args.html
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@ -1890,8 +1920,10 @@ impl<'a> Formatter<'a> {
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/// }
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/// }
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///
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/// // prints "{"A": 10, "B": 11}"
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/// println!("{:?}", Foo(vec![("A".to_string(), 10), ("B".to_string(), 11)]));
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/// assert_eq!(
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/// format!("{:?}", Foo(vec![("A".to_string(), 10), ("B".to_string(), 11)])),
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/// r#"{"A": 10, "B": 11}"#
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/// );
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/// ```
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#[stable(feature = "debug_builders", since = "1.2.0")]
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pub fn debug_map<'b>(&'b mut self) -> DebugMap<'b, 'a> {
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