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#![warn(missing_docs)] //! Fully-runtime equivalent of the `format!` macro. //! //! Allows formatting strings like the `format!` macro, with the formatting string and the arguments //! provided at runtime. This crate supports all the formatting features of the `format!` macro, //! except for the fill character. //! //! # Examples //! //! ``` //! use rt_format::{Arguments, Format, FormattableValue, Specifier}; //! use std::cmp::PartialEq; //! use std::convert::TryInto; //! use std::fmt; //! //! #[derive(Debug, PartialEq)] //! pub enum Variant { //! Int(i32), //! Float(f64), //! } //! //! impl FormattableValue for Variant { //! fn supports_format(&self, spec: &Specifier) -> bool { //! match self { //! Self::Int(_) => true, //! Self::Float(_) => match spec.format { //! Format::Display | Format::Debug | Format::LowerExp | Format::UpperExp => true, //! _ => false, //! }, //! } //! } //! //! fn fmt_display(&self, f: &mut fmt::Formatter) -> fmt::Result { //! match self { //! Self::Int(val) => fmt::Display::fmt(&val, f), //! Self::Float(val) => fmt::Display::fmt(&val, f), //! } //! } //! //! fn fmt_debug(&self, f: &mut fmt::Formatter) -> fmt::Result { //! fmt::Debug::fmt(self, f) //! } //! //! fn fmt_octal(&self, f: &mut fmt::Formatter) -> fmt::Result { //! match self { //! Self::Int(val) => fmt::Octal::fmt(&val, f), //! _ => Err(fmt::Error), //! } //! } //! //! fn fmt_lower_hex(&self, f: &mut fmt::Formatter) -> fmt::Result { //! match self { //! Self::Int(val) => fmt::LowerHex::fmt(&val, f), //! _ => Err(fmt::Error), //! } //! } //! //! fn fmt_upper_hex(&self, f: &mut fmt::Formatter) -> fmt::Result { //! match self { //! Self::Int(val) => fmt::UpperHex::fmt(&val, f), //! _ => Err(fmt::Error), //! } //! } //! //! fn fmt_binary(&self, f: &mut fmt::Formatter) -> fmt::Result { //! match self { //! Self::Int(val) => fmt::Binary::fmt(&val, f), //! _ => Err(fmt::Error), //! } //! } //! //! fn fmt_lower_exp(&self, f: &mut fmt::Formatter) -> fmt::Result { //! match self { //! Self::Int(val) => fmt::LowerExp::fmt(&val, f), //! Self::Float(val) => fmt::LowerExp::fmt(&val, f), //! } //! } //! //! fn fmt_upper_exp(&self, f: &mut fmt::Formatter) -> fmt::Result { //! match self { //! Self::Int(val) => fmt::UpperExp::fmt(&val, f), //! Self::Float(val) => fmt::UpperExp::fmt(&val, f), //! } //! } //! } //! //! impl TryInto<usize> for &Variant { //! type Error = (); //! fn try_into(self) -> Result<usize, Self::Error> { //! match self { //! Variant::Int(val) => (*val).try_into().map_err(|_| ()), //! Variant::Float(_) => Err(()), //! } //! } //! } //! //! fn main() { //! use std::collections::HashMap; //! //! let pos_args = [Variant::Int(42), Variant::Int(5)]; //! //! let mut named_args = HashMap::new(); //! named_args.insert("foo".to_string(), Variant::Float(42.042)); //! //! let args = Arguments::parse("{:#x} [{0:<5}] {foo:.1$}", &pos_args, &named_args).unwrap(); //! assert_eq!("0x2a [42 ] 42.04200", format!("{}", args)); //! } //! ``` #[macro_use] mod codegen; pub mod argument; pub mod map; pub mod parser; pub mod value; use std::cmp::PartialEq; use std::convert::TryFrom; use std::fmt; pub use crate::argument::{Argument, Arguments}; pub use crate::value::FormattableValue; generate_code! { /// Specifies the alignment of an argument with a specific width. align: Align { None => "", Left => "<", Center => "^", Right => ">", } /// Specifies whether the sign of a numeric argument should always be emitted. sign: Sign { Default => "", Always => "+", } /// Specifies whether to use the alternate representation for certain formats. repr: Repr { Default => "", Alt => "#", } /// Specifies whether a numeric argument with specific width should be padded with spaces or /// zeroes. pad: Pad { Space => "", Zero => "0", } /// Specifies whether an argument should be padded to a specific width. width: Width { Auto => "", AtLeast { width: usize } => "width$", } /// Specifies whether an argument should be formatted with a specific precision. precision: Precision { Auto => "", Exactly { precision: usize } => ".precision$", } /// Specifies how to format an argument. format: Format { Display => "", Debug => "?", Octal => "o", LowerHex => "x", UpperHex => "X", Binary => "b", LowerExp => "e", UpperExp => "E", } }