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//! Macros for data-encoding
//!
//! This library provides macros to define compile-time byte arrays from encoded
//! strings (using common bases like [base64], [base32], or [hexadecimal], and
//! also custom bases). It also provides a macro to define compile-time custom
//! encodings to be used with the [data-encoding] crate at run-time.
//!
//! If you were familiar with the [binary_macros] crate, this library is
//! actually [inspired][binary_macros_issue] from it.
//!
//! If you use a nightly compiler, you may disable the "stable" feature:
//!
//! ```text
//! data-encoding-macro = { version = "0.1.5", default-features = false }
//! ```
//!
//! # Examples
//!
//! You can define a compile-time byte slice from an encoded string literal:
//!
//! ```rust
//! # #![cfg_attr(not(feature = "stable"), feature(proc_macro_hygiene))]
//! #[macro_use]
//! extern crate data_encoding_macro;
//!
//! const HELLO_SLICE: &'static [u8] = &hexlower!("68656c6c6f");
//! const FOOBAR_SLICE: &'static [u8] = &base64!("Zm9vYmFy");
//! # fn main() {}
//! ```
//!
//! When you disable the "stable" feature (and use a nightly compiler), you can
//! also define a compile-time byte array from an encoded string literal:
//!
//! ```rust
//! # #[macro_use] extern crate data_encoding_macro;
//! # #[cfg(not(feature = "stable"))]
//! hexlower_array!("const HELLO" = "68656c6c6f");
//! # #[cfg(not(feature = "stable"))]
//! base64_array!("const FOOBAR" = "Zm9vYmFy");
//! # fn main() {}
//! ```
//!
//! You can define a compile-time custom encoding from its specification:
//!
//! ```rust
//! # #![cfg_attr(not(feature = "stable"), feature(proc_macro_hygiene))]
//! extern crate data_encoding;
//! #[macro_use]
//! extern crate data_encoding_macro;
//! use data_encoding::Encoding;
//!
//! const HEX: Encoding = new_encoding!{
//! symbols: "0123456789abcdef",
//! translate_from: "ABCDEF",
//! translate_to: "abcdef",
//! };
//! const BASE64: Encoding = new_encoding!{
//! symbols: "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/",
//! padding: '=',
//! };
//! # fn main() {}
//! ```
//!
//! [base32]: macro.base32.html
//! [base64]: macro.base64.html
//! [binary_macros]: https://crates.io/crates/binary_macros
//! [binary_macros_issue]: https://github.com/ia0/data-encoding/issues/7
//! [data-encoding]: https://crates.io/crates/data-encoding
//! [hexadecimal]: macro.hexlower_permissive.html
#![cfg_attr(not(feature = "stable"), feature(proc_macro_hygiene))]
#![warn(unused_results)]
#[cfg(feature = "stable")]
#[macro_use]
extern crate proc_macro_hack;
extern crate data_encoding;
#[cfg_attr(feature = "stable", allow(unused_imports))]
#[cfg_attr(feature = "stable", macro_use)]
extern crate data_encoding_macro_internal;
#[doc(hidden)]
pub use data_encoding_macro_internal::*;
#[cfg(feature = "stable")]
proc_macro_expr_decl! {
#[doc(hidden)]
internal_new_encoding! => internal_new_encoding_impl
}
#[cfg(feature = "stable")]
proc_macro_expr_decl! {
#[doc(hidden)]
internal_decode_slice! => internal_decode_slice_impl
}
/// Defines a compile-time byte array by decoding a string literal
///
/// This macro takes a list of `key: value,` pairs (the last comma is required).
/// It takes the key-value pairs specifying the encoding to use to decode the
/// input (see [new_encoding] for the possible key-value pairs), the input
/// itself keyed by `input`, and the output keyed by `name`. The output must be
/// of the form `[pub] {const|static} <name>`.
///
/// # Examples
///
/// ```rust
/// #[macro_use]
/// extern crate data_encoding_macro;
///
/// decode_array!{
/// name: "const OCTAL",
/// symbols: "01234567",
/// padding: '=',
/// input: "237610==",
/// }
/// # fn main() {}
/// ```
///
/// [new_encoding]: macro.new_encoding.html
#[cfg(not(feature = "stable"))]
#[macro_export]
macro_rules! decode_array {
($($arg: tt)*) => {
$crate::internal_decode_array!($($arg)*);
};
}
/// Defines a compile-time byte slice by decoding a string literal
///
/// This macro takes a list of `key: value,` pairs (the last comma is required).
/// It takes the key-value pairs specifying the encoding to use to decode the
/// input (see [new_encoding] for the possible key-value pairs), the input
/// itself keyed by `input`, and the output keyed by `name`.
///
/// # Examples
///
/// ```rust
/// # #![feature(proc_macro_hygiene)]
/// #[macro_use]
/// extern crate data_encoding_macro;
///
/// const OCTAL: &'static [u8] = &decode_slice!{
/// symbols: "01234567",
/// padding: '=',
/// input: "237610==",
/// };
/// # fn main() {}
/// ```
///
/// [new_encoding]: macro.new_encoding.html
#[cfg(not(feature = "stable"))]
#[macro_export]
macro_rules! decode_slice {
($($arg: tt)*) => {
$crate::internal_decode_slice!($($arg)*)
};
}
/// Defines a compile-time byte slice by decoding a string literal
///
/// This macro takes a list of `key: value,` pairs (the last comma is required).
/// It takes the key-value pairs specifying the encoding to use to decode the
/// input (see [new_encoding] for the possible key-value pairs), the input
/// itself keyed by `input`, and the output keyed by `name`.
///
/// # Examples
///
/// ```rust
/// #[macro_use]
/// extern crate data_encoding_macro;
///
/// const OCTAL: &'static [u8] = &decode_slice!{
/// symbols: "01234567",
/// padding: '=',
/// input: "237610==",
/// };
/// # fn main() {}
/// ```
///
/// [new_encoding]: macro.new_encoding.html
#[cfg(feature = "stable")]
#[macro_export]
macro_rules! decode_slice {
($($arg: tt)*) => {
internal_decode_slice!($($arg)*)
};
}
/// Defines a compile-time custom encoding
///
/// This macro takes a list of `key: value,` pairs (the last comma is required).
/// The possible key-value pairs are:
///
/// ```text
/// symbols: <string>, // e.g. "01234567"
/// padding: [None]|<char>, // e.g. '='
/// bit_order: [MostSignificantFirst]|LeastSignificantFirst,
/// check_trailing_bits: [true]|false,
/// ignore: [""]|<string>, // e.g. " \t\n"
/// wrap_width: [0]|<int>, // e.g. 76
/// wrap_separator: [""]|<string>, // e.g. "\r\n"
/// translate_from: [""]|<string>, // e.g. "ABCDEF"
/// translate_to: [""]|<string>, // e.g. "abcdef"
/// ```
///
/// Only `symbols` is required. Everything else is optional and defaults to the
/// value between square brackets.
///
/// # Examples
///
/// ```rust
/// # #![feature(proc_macro_hygiene)]
/// extern crate data_encoding;
/// #[macro_use] extern crate data_encoding_macro;
///
/// const HEX: data_encoding::Encoding = new_encoding!{
/// symbols: "0123456789abcdef",
/// ignore: " \r\t\n",
/// wrap_width: 32,
/// wrap_separator: "\n",
/// translate_from: "ABCDEF",
/// translate_to: "abcdef",
/// };
/// # fn main() {}
/// ```
#[cfg(not(feature = "stable"))]
#[macro_export]
macro_rules! new_encoding {
($($arg: tt)*) => {
::data_encoding::Encoding(::std::borrow::Cow::Borrowed(
&$crate::internal_new_encoding!{ $($arg)* }))
};
}
/// Defines a compile-time custom encoding
///
/// This macro takes a list of `key: value,` pairs (the last comma is required).
/// The possible key-value pairs are:
///
/// ```text
/// symbols: <string>, // e.g. "01234567"
/// padding: [None]|<char>, // e.g. '='
/// bit_order: [MostSignificantFirst]|LeastSignificantFirst,
/// check_trailing_bits: [true]|false,
/// ignore: [""]|<string>, // e.g. " \t\n"
/// wrap_width: [0]|<int>, // e.g. 76
/// wrap_separator: [""]|<string>, // e.g. "\r\n"
/// translate_from: [""]|<string>, // e.g. "ABCDEF"
/// translate_to: [""]|<string>, // e.g. "abcdef"
/// ```
///
/// Only `symbols` is required. Everything else is optional and defaults to the
/// value between square brackets.
///
/// # Examples
///
/// ```rust
/// extern crate data_encoding;
/// #[macro_use]
/// extern crate data_encoding_macro;
///
/// const HEX: data_encoding::Encoding = new_encoding!{
/// symbols: "0123456789abcdef",
/// ignore: " \r\t\n",
/// wrap_width: 32,
/// wrap_separator: "\n",
/// translate_from: "ABCDEF",
/// translate_to: "abcdef",
/// };
/// # fn main() {}
/// ```
#[cfg(feature = "stable")]
#[macro_export]
macro_rules! new_encoding {
($($arg: tt)*) => {
::data_encoding::Encoding(::std::borrow::Cow::Borrowed(
&internal_new_encoding!{ $($arg)* }))
};
}
macro_rules! make {
($base: ident $base_array: ident = $ref: ident; $($spec: tt)*) => {
#[cfg(not(feature = "stable"))]
#[macro_export]
macro_rules! $base_array {
($n: tt = $x: tt) => {
decode_array!(name: $n, input: $x, $($spec)*);
};
}
#[macro_export]
macro_rules! $base {
($x: tt) => {
decode_slice!(input: $x, $($spec)*)
};
}
#[test]
fn $base() {
assert_eq!(new_encoding!($($spec)*), data_encoding::$ref);
}
};
}
make!{
hexlower hexlower_array = HEXLOWER;
symbols: "0123456789abcdef",
}
make!{
hexlower_permissive hexlower_permissive_array = HEXLOWER_PERMISSIVE;
symbols: "0123456789abcdef",
translate_from: "ABCDEF",
translate_to: "abcdef",
}
make!{
hexupper hexupper_array = HEXUPPER;
symbols: "0123456789ABCDEF",
}
make!{
hexupper_permissive hexupper_permissive_array = HEXUPPER_PERMISSIVE;
symbols: "0123456789ABCDEF",
translate_from: "abcdef",
translate_to: "ABCDEF",
}
make!{
base32 base32_array = BASE32;
symbols: "ABCDEFGHIJKLMNOPQRSTUVWXYZ234567",
padding: '=',
}
make!{
base32_nopad base32_nopad_array = BASE32_NOPAD;
symbols: "ABCDEFGHIJKLMNOPQRSTUVWXYZ234567",
}
make!{
base32hex base32hex_array = BASE32HEX;
symbols: "0123456789ABCDEFGHIJKLMNOPQRSTUV",
padding: '=',
}
make!{
base32hex_nopad base32hex_nopad_array = BASE32HEX_NOPAD;
symbols: "0123456789ABCDEFGHIJKLMNOPQRSTUV",
}
make!{
base32_dnssec base32_dnssec_array = BASE32_DNSSEC;
symbols: "0123456789abcdefghijklmnopqrstuv",
translate_from: "ABCDEFGHIJKLMNOPQRSTUV",
translate_to: "abcdefghijklmnopqrstuv",
}
make!{
base32_dnscurve base32_dnscurve_array = BASE32_DNSCURVE;
symbols: "0123456789bcdfghjklmnpqrstuvwxyz",
bit_order: LeastSignificantFirst,
translate_from: "BCDFGHJKLMNPQRSTUVWXYZ",
translate_to: "bcdfghjklmnpqrstuvwxyz",
}
make!{
base64 base64_array = BASE64;
symbols: "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/",
padding: '=',
}
make!{
base64_nopad base64_nopad_array = BASE64_NOPAD;
symbols: "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/",
}
make!{
base64_mime base64_mime_array = BASE64_MIME;
symbols: "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/",
padding: '=',
wrap_width: 76,
wrap_separator: "\r\n",
}
make!{
base64url base64url_array = BASE64URL;
symbols: "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_",
padding: '=',
}
make!{
base64url_nopad base64url_nopad_array = BASE64URL_NOPAD;
symbols: "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_",
}