<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source to the Rust file `libcore/fmt/num.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>num.rs.html -- source</title><link rel="stylesheet" type="text/css" href="../../../normalize.css"><link rel="stylesheet" type="text/css" href="../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../../dark.css"><link rel="stylesheet" type="text/css" href="../../../light.css" id="themeStyle"><script src="../../../storage.js"></script><link rel="shortcut icon" href="https://doc.rust-lang.org/favicon.ico"></head><body class="rustdoc source"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu">☰</div><a href='../../../core/index.html'><img src='https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png' alt='logo' width='100'></a></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!"><img src="../../../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices"></div></div><script src="../../../theme.js"></script><nav class="sub"><form class="search-form js-only"><div class="search-container"><input class="search-input" name="search" autocomplete="off" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><a id="settings-menu" href="../../../settings.html"><img src="../../../wheel.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><pre class="line-numbers"><span id="1"> 1</span>
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</pre><pre class="rust ">
<span class="comment">// Copyright 2014 The Rust Project Developers. See the COPYRIGHT</span>
<span class="comment">// file at the top-level directory of this distribution and at</span>
<span class="comment">// http://rust-lang.org/COPYRIGHT.</span>
<span class="comment">//</span>
<span class="comment">// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or</span>
<span class="comment">// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license</span>
<span class="comment">// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your</span>
<span class="comment">// option. This file may not be copied, modified, or distributed</span>
<span class="comment">// except according to those terms.</span>
<span class="doccomment">//! Integer and floating-point number formatting</span>
<span class="attribute">#![<span class="ident">allow</span>(<span class="ident">deprecated</span>)]</span>
<span class="kw">use</span> <span class="ident">fmt</span>;
<span class="kw">use</span> <span class="ident">ops</span>::{<span class="ident">Div</span>, <span class="ident">Rem</span>, <span class="ident">Sub</span>};
<span class="kw">use</span> <span class="ident">str</span>;
<span class="kw">use</span> <span class="ident">slice</span>;
<span class="kw">use</span> <span class="ident">ptr</span>;
<span class="kw">use</span> <span class="ident">mem</span>;
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="kw">trait</span> <span class="ident">Int</span>: <span class="ident">PartialEq</span> <span class="op">+</span> <span class="ident">PartialOrd</span> <span class="op">+</span> <span class="ident">Div</span><span class="op"><</span><span class="ident">Output</span><span class="op">=</span><span class="self">Self</span><span class="op">></span> <span class="op">+</span> <span class="ident">Rem</span><span class="op"><</span><span class="ident">Output</span><span class="op">=</span><span class="self">Self</span><span class="op">></span> <span class="op">+</span>
<span class="ident">Sub</span><span class="op"><</span><span class="ident">Output</span><span class="op">=</span><span class="self">Self</span><span class="op">></span> <span class="op">+</span> <span class="ident">Copy</span> {
<span class="kw">fn</span> <span class="ident">zero</span>() <span class="op">-></span> <span class="self">Self</span>;
<span class="kw">fn</span> <span class="ident">from_u8</span>(<span class="ident">u</span>: <span class="ident">u8</span>) <span class="op">-></span> <span class="self">Self</span>;
<span class="kw">fn</span> <span class="ident">to_u8</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">u8</span>;
<span class="kw">fn</span> <span class="ident">to_u16</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">u16</span>;
<span class="kw">fn</span> <span class="ident">to_u32</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">u32</span>;
<span class="kw">fn</span> <span class="ident">to_u64</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">u64</span>;
<span class="kw">fn</span> <span class="ident">to_u128</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">u128</span>;
}
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">doit</span> {
($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>:<span class="ident">ident</span>)<span class="kw-2">*</span>) <span class="op">=></span> ($(<span class="kw">impl</span> <span class="ident">Int</span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span> {
<span class="kw">fn</span> <span class="ident">zero</span>() <span class="op">-></span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span> { <span class="number">0</span> }
<span class="kw">fn</span> <span class="ident">from_u8</span>(<span class="ident">u</span>: <span class="ident">u8</span>) <span class="op">-></span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span> { <span class="ident">u</span> <span class="kw">as</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span> }
<span class="kw">fn</span> <span class="ident">to_u8</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">u8</span> { <span class="kw-2">*</span><span class="self">self</span> <span class="kw">as</span> <span class="ident">u8</span> }
<span class="kw">fn</span> <span class="ident">to_u16</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">u16</span> { <span class="kw-2">*</span><span class="self">self</span> <span class="kw">as</span> <span class="ident">u16</span> }
<span class="kw">fn</span> <span class="ident">to_u32</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">u32</span> { <span class="kw-2">*</span><span class="self">self</span> <span class="kw">as</span> <span class="ident">u32</span> }
<span class="kw">fn</span> <span class="ident">to_u64</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">u64</span> { <span class="kw-2">*</span><span class="self">self</span> <span class="kw">as</span> <span class="ident">u64</span> }
<span class="kw">fn</span> <span class="ident">to_u128</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">u128</span> { <span class="kw-2">*</span><span class="self">self</span> <span class="kw">as</span> <span class="ident">u128</span> }
})<span class="kw-2">*</span>)
}
<span class="macro">doit</span><span class="macro">!</span> { <span class="ident">i8</span> <span class="ident">i16</span> <span class="ident">i32</span> <span class="ident">i64</span> <span class="ident">i128</span> <span class="ident">isize</span> <span class="ident">u8</span> <span class="ident">u16</span> <span class="ident">u32</span> <span class="ident">u64</span> <span class="ident">u128</span> <span class="ident">usize</span> }
<span class="doccomment">/// A type that represents a specific radix</span>
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="kw">trait</span> <span class="ident">GenericRadix</span> {
<span class="doccomment">/// The number of digits.</span>
<span class="kw">const</span> <span class="ident">BASE</span>: <span class="ident">u8</span>;
<span class="doccomment">/// A radix-specific prefix string.</span>
<span class="kw">const</span> <span class="ident">PREFIX</span>: <span class="kw-2">&</span><span class="lifetime">'static</span> <span class="ident">str</span>;
<span class="doccomment">/// Converts an integer to corresponding radix digit.</span>
<span class="kw">fn</span> <span class="ident">digit</span>(<span class="ident">x</span>: <span class="ident">u8</span>) <span class="op">-></span> <span class="ident">u8</span>;
<span class="doccomment">/// Format an integer using the radix using a formatter.</span>
<span class="kw">fn</span> <span class="ident">fmt_int</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Int</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="kw-2">mut</span> <span class="ident">x</span>: <span class="ident">T</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="comment">// The radix can be as low as 2, so we need a buffer of at least 128</span>
<span class="comment">// characters for a base 2 number.</span>
<span class="kw">let</span> <span class="ident">zero</span> <span class="op">=</span> <span class="ident">T</span>::<span class="ident">zero</span>();
<span class="kw">let</span> <span class="ident">is_nonnegative</span> <span class="op">=</span> <span class="ident">x</span> <span class="op">>=</span> <span class="ident">zero</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">buf</span>: [<span class="ident">u8</span>; <span class="number">128</span>] <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">mem</span>::<span class="ident">uninitialized</span>() };
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">curr</span> <span class="op">=</span> <span class="ident">buf</span>.<span class="ident">len</span>();
<span class="kw">let</span> <span class="ident">base</span> <span class="op">=</span> <span class="ident">T</span>::<span class="ident">from_u8</span>(<span class="self">Self</span>::<span class="ident">BASE</span>);
<span class="kw">if</span> <span class="ident">is_nonnegative</span> {
<span class="comment">// Accumulate each digit of the number from the least significant</span>
<span class="comment">// to the most significant figure.</span>
<span class="kw">for</span> <span class="ident">byte</span> <span class="kw">in</span> <span class="ident">buf</span>.<span class="ident">iter_mut</span>().<span class="ident">rev</span>() {
<span class="kw">let</span> <span class="ident">n</span> <span class="op">=</span> <span class="ident">x</span> <span class="op">%</span> <span class="ident">base</span>; <span class="comment">// Get the current place value.</span>
<span class="ident">x</span> <span class="op">=</span> <span class="ident">x</span> <span class="op">/</span> <span class="ident">base</span>; <span class="comment">// Deaccumulate the number.</span>
<span class="kw-2">*</span><span class="ident">byte</span> <span class="op">=</span> <span class="self">Self</span>::<span class="ident">digit</span>(<span class="ident">n</span>.<span class="ident">to_u8</span>()); <span class="comment">// Store the digit in the buffer.</span>
<span class="ident">curr</span> <span class="op">-=</span> <span class="number">1</span>;
<span class="kw">if</span> <span class="ident">x</span> <span class="op">==</span> <span class="ident">zero</span> {
<span class="comment">// No more digits left to accumulate.</span>
<span class="kw">break</span>
};
}
} <span class="kw">else</span> {
<span class="comment">// Do the same as above, but accounting for two's complement.</span>
<span class="kw">for</span> <span class="ident">byte</span> <span class="kw">in</span> <span class="ident">buf</span>.<span class="ident">iter_mut</span>().<span class="ident">rev</span>() {
<span class="kw">let</span> <span class="ident">n</span> <span class="op">=</span> <span class="ident">zero</span> <span class="op">-</span> (<span class="ident">x</span> <span class="op">%</span> <span class="ident">base</span>); <span class="comment">// Get the current place value.</span>
<span class="ident">x</span> <span class="op">=</span> <span class="ident">x</span> <span class="op">/</span> <span class="ident">base</span>; <span class="comment">// Deaccumulate the number.</span>
<span class="kw-2">*</span><span class="ident">byte</span> <span class="op">=</span> <span class="self">Self</span>::<span class="ident">digit</span>(<span class="ident">n</span>.<span class="ident">to_u8</span>()); <span class="comment">// Store the digit in the buffer.</span>
<span class="ident">curr</span> <span class="op">-=</span> <span class="number">1</span>;
<span class="kw">if</span> <span class="ident">x</span> <span class="op">==</span> <span class="ident">zero</span> {
<span class="comment">// No more digits left to accumulate.</span>
<span class="kw">break</span>
};
}
}
<span class="kw">let</span> <span class="ident">buf</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">str</span>::<span class="ident">from_utf8_unchecked</span>(<span class="kw-2">&</span><span class="ident">buf</span>[<span class="ident">curr</span>..]) };
<span class="ident">f</span>.<span class="ident">pad_integral</span>(<span class="ident">is_nonnegative</span>, <span class="self">Self</span>::<span class="ident">PREFIX</span>, <span class="ident">buf</span>)
}
}
<span class="doccomment">/// A binary (base 2) radix</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">PartialEq</span>)]</span>
<span class="kw">struct</span> <span class="ident">Binary</span>;
<span class="doccomment">/// An octal (base 8) radix</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">PartialEq</span>)]</span>
<span class="kw">struct</span> <span class="ident">Octal</span>;
<span class="doccomment">/// A hexadecimal (base 16) radix, formatted with lower-case characters</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">PartialEq</span>)]</span>
<span class="kw">struct</span> <span class="ident">LowerHex</span>;
<span class="doccomment">/// A hexadecimal (base 16) radix, formatted with upper-case characters</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">PartialEq</span>)]</span>
<span class="kw">struct</span> <span class="ident">UpperHex</span>;
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">radix</span> {
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">T</span>:<span class="ident">ident</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">base</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">prefix</span>:<span class="ident">expr</span>, $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">x</span>:<span class="ident">pat</span> <span class="op">=></span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">conv</span>:<span class="ident">expr</span>),<span class="op">+</span>) <span class="op">=></span> {
<span class="kw">impl</span> <span class="ident">GenericRadix</span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">T</span> {
<span class="kw">const</span> <span class="ident">BASE</span>: <span class="ident">u8</span> <span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">base</span>;
<span class="kw">const</span> <span class="ident">PREFIX</span>: <span class="kw-2">&</span><span class="lifetime">'static</span> <span class="ident">str</span> <span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">prefix</span>;
<span class="kw">fn</span> <span class="ident">digit</span>(<span class="ident">x</span>: <span class="ident">u8</span>) <span class="op">-></span> <span class="ident">u8</span> {
<span class="kw">match</span> <span class="ident">x</span> {
$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">x</span> <span class="op">=></span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">conv</span>,)<span class="op">+</span>
<span class="ident">x</span> <span class="op">=></span> <span class="macro">panic</span><span class="macro">!</span>(<span class="string">"number not in the range 0..{}: {}"</span>, <span class="self">Self</span>::<span class="ident">BASE</span> <span class="op">-</span> <span class="number">1</span>, <span class="ident">x</span>),
}
}
}
}
}
<span class="macro">radix</span><span class="macro">!</span> { <span class="ident">Binary</span>, <span class="number">2</span>, <span class="string">"0b"</span>, <span class="ident">x</span> @ <span class="number">0</span> ... <span class="number">1</span> <span class="op">=></span> <span class="string">b'0'</span> <span class="op">+</span> <span class="ident">x</span> }
<span class="macro">radix</span><span class="macro">!</span> { <span class="ident">Octal</span>, <span class="number">8</span>, <span class="string">"0o"</span>, <span class="ident">x</span> @ <span class="number">0</span> ... <span class="number">7</span> <span class="op">=></span> <span class="string">b'0'</span> <span class="op">+</span> <span class="ident">x</span> }
<span class="macro">radix</span><span class="macro">!</span> { <span class="ident">LowerHex</span>, <span class="number">16</span>, <span class="string">"0x"</span>, <span class="ident">x</span> @ <span class="number">0</span> ... <span class="number">9</span> <span class="op">=></span> <span class="string">b'0'</span> <span class="op">+</span> <span class="ident">x</span>,
<span class="ident">x</span> @ <span class="number">10</span> ... <span class="number">15</span> <span class="op">=></span> <span class="string">b'a'</span> <span class="op">+</span> (<span class="ident">x</span> <span class="op">-</span> <span class="number">10</span>) }
<span class="macro">radix</span><span class="macro">!</span> { <span class="ident">UpperHex</span>, <span class="number">16</span>, <span class="string">"0x"</span>, <span class="ident">x</span> @ <span class="number">0</span> ... <span class="number">9</span> <span class="op">=></span> <span class="string">b'0'</span> <span class="op">+</span> <span class="ident">x</span>,
<span class="ident">x</span> @ <span class="number">10</span> ... <span class="number">15</span> <span class="op">=></span> <span class="string">b'A'</span> <span class="op">+</span> (<span class="ident">x</span> <span class="op">-</span> <span class="number">10</span>) }
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">int_base</span> {
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">Trait</span>:<span class="ident">ident</span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">T</span>:<span class="ident">ident</span> <span class="kw">as</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">U</span>:<span class="ident">ident</span> <span class="op">-></span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">Radix</span>:<span class="ident">ident</span>) <span class="op">=></span> {
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span> <span class="ident">fmt</span>::<span class="macro-nonterminal">$</span><span class="macro-nonterminal">Trait</span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">T</span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="macro-nonterminal">$</span><span class="macro-nonterminal">Radix</span>.<span class="ident">fmt_int</span>(<span class="kw-2">*</span><span class="self">self</span> <span class="kw">as</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">U</span>, <span class="ident">f</span>)
}
}
}
}
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">debug</span> {
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">T</span>:<span class="ident">ident</span>) <span class="op">=></span> {
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">T</span> {
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="kw">if</span> <span class="ident">f</span>.<span class="ident">debug_lower_hex</span>() {
<span class="ident">fmt</span>::<span class="ident">LowerHex</span>::<span class="ident">fmt</span>(<span class="self">self</span>, <span class="ident">f</span>)
} <span class="kw">else</span> <span class="kw">if</span> <span class="ident">f</span>.<span class="ident">debug_upper_hex</span>() {
<span class="ident">fmt</span>::<span class="ident">UpperHex</span>::<span class="ident">fmt</span>(<span class="self">self</span>, <span class="ident">f</span>)
} <span class="kw">else</span> {
<span class="ident">fmt</span>::<span class="ident">Display</span>::<span class="ident">fmt</span>(<span class="self">self</span>, <span class="ident">f</span>)
}
}
}
}
}
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">integer</span> {
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">Int</span>:<span class="ident">ident</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">Uint</span>:<span class="ident">ident</span>) <span class="op">=></span> {
<span class="macro">int_base</span><span class="macro">!</span> { <span class="ident">Binary</span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">Int</span> <span class="kw">as</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">Uint</span> <span class="op">-></span> <span class="ident">Binary</span> }
<span class="macro">int_base</span><span class="macro">!</span> { <span class="ident">Octal</span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">Int</span> <span class="kw">as</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">Uint</span> <span class="op">-></span> <span class="ident">Octal</span> }
<span class="macro">int_base</span><span class="macro">!</span> { <span class="ident">LowerHex</span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">Int</span> <span class="kw">as</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">Uint</span> <span class="op">-></span> <span class="ident">LowerHex</span> }
<span class="macro">int_base</span><span class="macro">!</span> { <span class="ident">UpperHex</span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">Int</span> <span class="kw">as</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">Uint</span> <span class="op">-></span> <span class="ident">UpperHex</span> }
<span class="macro">debug</span><span class="macro">!</span> { <span class="macro-nonterminal">$</span><span class="macro-nonterminal">Int</span> }
<span class="macro">int_base</span><span class="macro">!</span> { <span class="ident">Binary</span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">Uint</span> <span class="kw">as</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">Uint</span> <span class="op">-></span> <span class="ident">Binary</span> }
<span class="macro">int_base</span><span class="macro">!</span> { <span class="ident">Octal</span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">Uint</span> <span class="kw">as</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">Uint</span> <span class="op">-></span> <span class="ident">Octal</span> }
<span class="macro">int_base</span><span class="macro">!</span> { <span class="ident">LowerHex</span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">Uint</span> <span class="kw">as</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">Uint</span> <span class="op">-></span> <span class="ident">LowerHex</span> }
<span class="macro">int_base</span><span class="macro">!</span> { <span class="ident">UpperHex</span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">Uint</span> <span class="kw">as</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">Uint</span> <span class="op">-></span> <span class="ident">UpperHex</span> }
<span class="macro">debug</span><span class="macro">!</span> { <span class="macro-nonterminal">$</span><span class="macro-nonterminal">Uint</span> }
}
}
<span class="macro">integer</span><span class="macro">!</span> { <span class="ident">isize</span>, <span class="ident">usize</span> }
<span class="macro">integer</span><span class="macro">!</span> { <span class="ident">i8</span>, <span class="ident">u8</span> }
<span class="macro">integer</span><span class="macro">!</span> { <span class="ident">i16</span>, <span class="ident">u16</span> }
<span class="macro">integer</span><span class="macro">!</span> { <span class="ident">i32</span>, <span class="ident">u32</span> }
<span class="macro">integer</span><span class="macro">!</span> { <span class="ident">i64</span>, <span class="ident">u64</span> }
<span class="macro">integer</span><span class="macro">!</span> { <span class="ident">i128</span>, <span class="ident">u128</span> }
<span class="kw">const</span> <span class="ident">DEC_DIGITS_LUT</span>: <span class="kw-2">&</span><span class="lifetime">'static</span>[<span class="ident">u8</span>] <span class="op">=</span>
<span class="string">b"0001020304050607080910111213141516171819\
2021222324252627282930313233343536373839\
4041424344454647484950515253545556575859\
6061626364656667686970717273747576777879\
8081828384858687888990919293949596979899"</span>;
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">impl_Display</span> {
($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>:<span class="ident">ident</span>),<span class="kw-2">*</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">conv_fn</span>:<span class="ident">ident</span>) <span class="op">=></span> ($(
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span> <span class="ident">fmt</span>::<span class="ident">Display</span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span> {
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">unused_comparisons</span>)]</span>
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="kw">let</span> <span class="ident">is_nonnegative</span> <span class="op">=</span> <span class="kw-2">*</span><span class="self">self</span> <span class="op">>=</span> <span class="number">0</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">n</span> <span class="op">=</span> <span class="kw">if</span> <span class="ident">is_nonnegative</span> {
<span class="self">self</span>.<span class="macro-nonterminal">$</span><span class="macro-nonterminal">conv_fn</span>()
} <span class="kw">else</span> {
<span class="comment">// convert the negative num to positive by summing 1 to it's 2 complement</span>
(<span class="op">!</span><span class="self">self</span>.<span class="macro-nonterminal">$</span><span class="macro-nonterminal">conv_fn</span>()).<span class="ident">wrapping_add</span>(<span class="number">1</span>)
};
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">buf</span>: [<span class="ident">u8</span>; <span class="number">39</span>] <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">mem</span>::<span class="ident">uninitialized</span>() };
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">curr</span> <span class="op">=</span> <span class="ident">buf</span>.<span class="ident">len</span>() <span class="kw">as</span> <span class="ident">isize</span>;
<span class="kw">let</span> <span class="ident">buf_ptr</span> <span class="op">=</span> <span class="ident">buf</span>.<span class="ident">as_mut_ptr</span>();
<span class="kw">let</span> <span class="ident">lut_ptr</span> <span class="op">=</span> <span class="ident">DEC_DIGITS_LUT</span>.<span class="ident">as_ptr</span>();
<span class="kw">unsafe</span> {
<span class="comment">// need at least 16 bits for the 4-characters-at-a-time to work.</span>
<span class="kw">if</span> ::<span class="ident">mem</span>::<span class="ident">size_of</span>::<span class="op"><</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span><span class="op">></span>() <span class="op">>=</span> <span class="number">2</span> {
<span class="comment">// eagerly decode 4 characters at a time</span>
<span class="kw">while</span> <span class="ident">n</span> <span class="op">>=</span> <span class="number">10000</span> {
<span class="kw">let</span> <span class="ident">rem</span> <span class="op">=</span> (<span class="ident">n</span> <span class="op">%</span> <span class="number">10000</span>) <span class="kw">as</span> <span class="ident">isize</span>;
<span class="ident">n</span> <span class="op">/=</span> <span class="number">10000</span>;
<span class="kw">let</span> <span class="ident">d1</span> <span class="op">=</span> (<span class="ident">rem</span> <span class="op">/</span> <span class="number">100</span>) <span class="op"><<</span> <span class="number">1</span>;
<span class="kw">let</span> <span class="ident">d2</span> <span class="op">=</span> (<span class="ident">rem</span> <span class="op">%</span> <span class="number">100</span>) <span class="op"><<</span> <span class="number">1</span>;
<span class="ident">curr</span> <span class="op">-=</span> <span class="number">4</span>;
<span class="ident">ptr</span>::<span class="ident">copy_nonoverlapping</span>(<span class="ident">lut_ptr</span>.<span class="ident">offset</span>(<span class="ident">d1</span>), <span class="ident">buf_ptr</span>.<span class="ident">offset</span>(<span class="ident">curr</span>), <span class="number">2</span>);
<span class="ident">ptr</span>::<span class="ident">copy_nonoverlapping</span>(<span class="ident">lut_ptr</span>.<span class="ident">offset</span>(<span class="ident">d2</span>), <span class="ident">buf_ptr</span>.<span class="ident">offset</span>(<span class="ident">curr</span> <span class="op">+</span> <span class="number">2</span>), <span class="number">2</span>);
}
}
<span class="comment">// if we reach here numbers are <= 9999, so at most 4 chars long</span>
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">n</span> <span class="op">=</span> <span class="ident">n</span> <span class="kw">as</span> <span class="ident">isize</span>; <span class="comment">// possibly reduce 64bit math</span>
<span class="comment">// decode 2 more chars, if > 2 chars</span>
<span class="kw">if</span> <span class="ident">n</span> <span class="op">>=</span> <span class="number">100</span> {
<span class="kw">let</span> <span class="ident">d1</span> <span class="op">=</span> (<span class="ident">n</span> <span class="op">%</span> <span class="number">100</span>) <span class="op"><<</span> <span class="number">1</span>;
<span class="ident">n</span> <span class="op">/=</span> <span class="number">100</span>;
<span class="ident">curr</span> <span class="op">-=</span> <span class="number">2</span>;
<span class="ident">ptr</span>::<span class="ident">copy_nonoverlapping</span>(<span class="ident">lut_ptr</span>.<span class="ident">offset</span>(<span class="ident">d1</span>), <span class="ident">buf_ptr</span>.<span class="ident">offset</span>(<span class="ident">curr</span>), <span class="number">2</span>);
}
<span class="comment">// decode last 1 or 2 chars</span>
<span class="kw">if</span> <span class="ident">n</span> <span class="op"><</span> <span class="number">10</span> {
<span class="ident">curr</span> <span class="op">-=</span> <span class="number">1</span>;
<span class="kw-2">*</span><span class="ident">buf_ptr</span>.<span class="ident">offset</span>(<span class="ident">curr</span>) <span class="op">=</span> (<span class="ident">n</span> <span class="kw">as</span> <span class="ident">u8</span>) <span class="op">+</span> <span class="string">b'0'</span>;
} <span class="kw">else</span> {
<span class="kw">let</span> <span class="ident">d1</span> <span class="op">=</span> <span class="ident">n</span> <span class="op"><<</span> <span class="number">1</span>;
<span class="ident">curr</span> <span class="op">-=</span> <span class="number">2</span>;
<span class="ident">ptr</span>::<span class="ident">copy_nonoverlapping</span>(<span class="ident">lut_ptr</span>.<span class="ident">offset</span>(<span class="ident">d1</span>), <span class="ident">buf_ptr</span>.<span class="ident">offset</span>(<span class="ident">curr</span>), <span class="number">2</span>);
}
}
<span class="kw">let</span> <span class="ident">buf_slice</span> <span class="op">=</span> <span class="kw">unsafe</span> {
<span class="ident">str</span>::<span class="ident">from_utf8_unchecked</span>(
<span class="ident">slice</span>::<span class="ident">from_raw_parts</span>(<span class="ident">buf_ptr</span>.<span class="ident">offset</span>(<span class="ident">curr</span>), <span class="ident">buf</span>.<span class="ident">len</span>() <span class="op">-</span> <span class="ident">curr</span> <span class="kw">as</span> <span class="ident">usize</span>))
};
<span class="ident">f</span>.<span class="ident">pad_integral</span>(<span class="ident">is_nonnegative</span>, <span class="string">""</span>, <span class="ident">buf_slice</span>)
}
})<span class="kw-2">*</span>);
}
<span class="macro">impl_Display</span><span class="macro">!</span>(<span class="ident">i8</span>, <span class="ident">u8</span>, <span class="ident">i16</span>, <span class="ident">u16</span>, <span class="ident">i32</span>, <span class="ident">u32</span>: <span class="ident">to_u32</span>);
<span class="macro">impl_Display</span><span class="macro">!</span>(<span class="ident">i64</span>, <span class="ident">u64</span>: <span class="ident">to_u64</span>);
<span class="macro">impl_Display</span><span class="macro">!</span>(<span class="ident">i128</span>, <span class="ident">u128</span>: <span class="ident">to_u128</span>);
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_pointer_width</span> <span class="op">=</span> <span class="string">"16"</span>)]</span>
<span class="macro">impl_Display</span><span class="macro">!</span>(<span class="ident">isize</span>, <span class="ident">usize</span>: <span class="ident">to_u16</span>);
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_pointer_width</span> <span class="op">=</span> <span class="string">"32"</span>)]</span>
<span class="macro">impl_Display</span><span class="macro">!</span>(<span class="ident">isize</span>, <span class="ident">usize</span>: <span class="ident">to_u32</span>);
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_pointer_width</span> <span class="op">=</span> <span class="string">"64"</span>)]</span>
<span class="macro">impl_Display</span><span class="macro">!</span>(<span class="ident">isize</span>, <span class="ident">usize</span>: <span class="ident">to_u64</span>);
</pre>
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