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<!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 of the Rust file `crates/common/src/numeric.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>numeric.rs - 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="../../light.css" id="themeStyle"><link rel="stylesheet" type="text/css" href="../../dark.css" disabled ><link rel="stylesheet" type="text/css" href="../../ayu.css" disabled ><script id="default-settings" ></script><script src="../../storage.js"></script><script src="../../crates.js"></script><script defer src="../../main.js"></script><script defer src="../../source-script.js"></script><script defer src="../../source-files.js"></script>
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</pre><pre class="rust"><code><span class="doccomment">/// A type that represents the radix of a numeric literal.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">Clone</span>, <span class="ident">Copy</span>, <span class="ident">PartialEq</span>, <span class="ident">Eq</span>)]</span>
<span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">Radix</span> {
<span class="ident">Hexadecimal</span>,
<span class="ident">Decimal</span>,
<span class="ident">Octal</span>,
<span class="ident">Binary</span>,
}
<span class="kw">impl</span> <span class="ident">Radix</span> {
<span class="doccomment">/// Returns number representation of the radix.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">as_num</span>(<span class="self">self</span>) -> <span class="ident">u32</span> {
<span class="kw">match</span> <span class="self">self</span> {
<span class="ident"><span class="self">Self</span>::Hexadecimal</span> => <span class="number">16</span>,
<span class="ident"><span class="self">Self</span>::Decimal</span> => <span class="number">10</span>,
<span class="ident"><span class="self">Self</span>::Octal</span> => <span class="number">8</span>,
<span class="ident"><span class="self">Self</span>::Binary</span> => <span class="number">2</span>,
}
}
}
<span class="doccomment">/// A helper type to interpret a numeric literal represented by string.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">Clone</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Literal</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="doccomment">/// The number part of the string.</span>
<span class="ident">num</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">str</span>,
<span class="doccomment">/// The radix of the literal.</span>
<span class="ident">radix</span>: <span class="ident">Radix</span>,
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">Literal</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">src</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">str</span>) -> <span class="self">Self</span> {
<span class="macro">debug_assert!</span>(<span class="op">!</span><span class="ident">src</span>.<span class="ident">is_empty</span>());
<span class="macro">debug_assert_ne!</span>(<span class="ident">src</span>.<span class="ident">chars</span>().<span class="ident">next</span>(), <span class="prelude-val">Some</span>(<span class="string">'-'</span>));
<span class="kw">let</span> (<span class="ident">radix</span>, <span class="ident">prefix</span>) <span class="op">=</span> <span class="kw">if</span> <span class="ident">src</span>.<span class="ident">len</span>() <span class="op"><</span> <span class="number">2</span> {
(<span class="ident">Radix::Decimal</span>, <span class="prelude-val">None</span>)
} <span class="kw">else</span> {
<span class="kw">match</span> <span class="kw-2">&</span><span class="ident">src</span>[<span class="number">0</span>..<span class="number">2</span>] {
<span class="string">"0x"</span> <span class="op">|</span> <span class="string">"0X"</span> => (<span class="ident">Radix::Hexadecimal</span>, <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="ident">src</span>[..<span class="number">2</span>])),
<span class="string">"0o"</span> <span class="op">|</span> <span class="string">"0O"</span> => (<span class="ident">Radix::Octal</span>, <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="ident">src</span>[..<span class="number">2</span>])),
<span class="string">"0b"</span> <span class="op">|</span> <span class="string">"0B"</span> => (<span class="ident">Radix::Binary</span>, <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="ident">src</span>[..<span class="number">2</span>])),
<span class="kw">_</span> => (<span class="ident">Radix::Decimal</span>, <span class="prelude-val">None</span>),
}
};
<span class="self">Self</span> {
<span class="ident">num</span>: <span class="kw-2">&</span><span class="ident">src</span>[<span class="ident">prefix</span>.<span class="ident">map_or</span>(<span class="number">0</span>, <span class="op">|</span><span class="ident">pref</span><span class="op">|</span> <span class="ident">pref</span>.<span class="ident">len</span>())..],
<span class="ident">radix</span>,
}
}
<span class="doccomment">/// Parse the numeric literal to `T`.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">parse</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">num_traits::Num</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">T::FromStrRadixErr</span><span class="op">></span> {
<span class="ident">T::from_str_radix</span>(<span class="self">self</span>.<span class="ident">num</span>, <span class="self">self</span>.<span class="ident">radix</span>.<span class="ident">as_num</span>())
}
<span class="doccomment">/// Returns radix of the numeric literal.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">radix</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="ident">Radix</span> {
<span class="self">self</span>.<span class="ident">radix</span>
}
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span>
<span class="kw">mod</span> <span class="ident">tests</span> {
<span class="kw">use</span> <span class="kw">super</span>::<span class="kw-2">*</span>;
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_radix</span>() {
<span class="macro">assert_eq!</span>(<span class="ident">Literal::new</span>(<span class="string">"0XFF"</span>).<span class="ident">radix</span>(), <span class="ident">Radix::Hexadecimal</span>);
<span class="macro">assert_eq!</span>(<span class="ident">Literal::new</span>(<span class="string">"0xFF"</span>).<span class="ident">radix</span>(), <span class="ident">Radix::Hexadecimal</span>);
<span class="macro">assert_eq!</span>(<span class="ident">Literal::new</span>(<span class="string">"0O77"</span>).<span class="ident">radix</span>(), <span class="ident">Radix::Octal</span>);
<span class="macro">assert_eq!</span>(<span class="ident">Literal::new</span>(<span class="string">"0o77"</span>).<span class="ident">radix</span>(), <span class="ident">Radix::Octal</span>);
<span class="macro">assert_eq!</span>(<span class="ident">Literal::new</span>(<span class="string">"0B77"</span>).<span class="ident">radix</span>(), <span class="ident">Radix::Binary</span>);
<span class="macro">assert_eq!</span>(<span class="ident">Literal::new</span>(<span class="string">"0b77"</span>).<span class="ident">radix</span>(), <span class="ident">Radix::Binary</span>);
<span class="macro">assert_eq!</span>(<span class="ident">Literal::new</span>(<span class="string">"1"</span>).<span class="ident">radix</span>(), <span class="ident">Radix::Decimal</span>);
<span class="comment">// Invalid radix is treated as `Decimal`.</span>
<span class="macro">assert_eq!</span>(<span class="ident">Literal::new</span>(<span class="string">"0D15"</span>).<span class="ident">radix</span>(), <span class="ident">Radix::Decimal</span>);
}
}
</code></pre></div>
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