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| </pre><pre class="rust"><code><span class="comment">// Copyright 2013-2014 The Rust Project Developers. |
| // Copyright 2018 The Uuid Project Developers. |
| // |
| // See the COPYRIGHT file at the top-level directory of this distribution. |
| // |
| // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or |
| // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license |
| // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your |
| // option. This file may not be copied, modified, or distributed |
| // except according to those terms. |
| |
| </span><span class="doccomment">//! [`Uuid`] parsing constructs and utilities. |
| //! |
| //! [`Uuid`]: ../struct.Uuid.html |
| |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">mod </span>error; |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">use </span><span class="self">self</span>::error::Error; |
| |
| <span class="kw">use crate</span>::{adapter, Uuid}; |
| |
| <span class="doccomment">/// Check if the length matches any of the given criteria lengths. |
| </span><span class="kw">fn </span>len_matches_any(len: usize, crits: <span class="kw-2">&</span>[usize]) -> bool { |
| <span class="kw">for </span>crit <span class="kw">in </span>crits { |
| <span class="kw">if </span>len == <span class="kw-2">*</span>crit { |
| <span class="kw">return </span><span class="bool-val">true</span>; |
| } |
| } |
| |
| <span class="bool-val">false |
| </span>} |
| |
| <span class="doccomment">/// Check if the length matches any criteria lengths in the given range |
| /// (inclusive). |
| </span><span class="attribute">#[allow(dead_code)] |
| </span><span class="kw">fn </span>len_matches_range(len: usize, min: usize, max: usize) -> bool { |
| <span class="kw">for </span>crit <span class="kw">in </span>min..=max { |
| <span class="kw">if </span>len == crit { |
| <span class="kw">return </span><span class="bool-val">true</span>; |
| } |
| } |
| |
| <span class="bool-val">false |
| </span>} |
| |
| <span class="comment">// Accumulated length of each hyphenated group in hex digits. |
| </span><span class="kw">const </span>ACC_GROUP_LENS: [usize; <span class="number">5</span>] = [<span class="number">8</span>, <span class="number">12</span>, <span class="number">16</span>, <span class="number">20</span>, <span class="number">32</span>]; |
| |
| <span class="comment">// Length of each hyphenated group in hex digits. |
| </span><span class="kw">const </span>GROUP_LENS: [usize; <span class="number">5</span>] = [<span class="number">8</span>, <span class="number">4</span>, <span class="number">4</span>, <span class="number">4</span>, <span class="number">12</span>]; |
| |
| <span class="kw">impl </span>Uuid { |
| <span class="doccomment">/// Parses a `Uuid` from a string of hexadecimal digits with optional |
| /// hyphens. |
| /// |
| /// Any of the formats generated by this module (simple, hyphenated, urn) |
| /// are supported by this parsing function. |
| </span><span class="kw">pub fn </span>parse_str(<span class="kw-2">mut </span>input: <span class="kw-2">&</span>str) -> <span class="prelude-ty">Result</span><Uuid, <span class="kw">crate</span>::Error> { |
| <span class="comment">// Ensure length is valid for any of the supported formats |
| </span><span class="kw">let </span>len = input.len(); |
| |
| <span class="kw">if </span>len == adapter::Urn::LENGTH && input.starts_with(<span class="string">"urn:uuid:"</span>) { |
| input = <span class="kw-2">&</span>input[<span class="number">9</span>..]; |
| } <span class="kw">else if </span>!len_matches_any( |
| len, |
| <span class="kw-2">&</span>[adapter::Hyphenated::LENGTH, adapter::Simple::LENGTH], |
| ) { |
| <span class="prelude-val">Err</span>(Error::InvalidLength { |
| expected: error::ExpectedLength::Any(<span class="kw-2">&</span>[ |
| adapter::Hyphenated::LENGTH, |
| adapter::Simple::LENGTH, |
| ]), |
| found: len, |
| })<span class="question-mark">?</span>; |
| } |
| |
| <span class="comment">// `digit` counts only hexadecimal digits, `i_char` counts all chars. |
| </span><span class="kw">let </span><span class="kw-2">mut </span>digit = <span class="number">0</span>; |
| <span class="kw">let </span><span class="kw-2">mut </span>group = <span class="number">0</span>; |
| <span class="kw">let </span><span class="kw-2">mut </span>acc = <span class="number">0</span>; |
| <span class="kw">let </span><span class="kw-2">mut </span>buffer = [<span class="number">0u8</span>; <span class="number">16</span>]; |
| |
| <span class="kw">for </span>(i_char, chr) <span class="kw">in </span>input.bytes().enumerate() { |
| <span class="kw">if </span>digit <span class="kw">as </span>usize >= adapter::Simple::LENGTH && group != <span class="number">4 </span>{ |
| <span class="kw">if </span>group == <span class="number">0 </span>{ |
| <span class="prelude-val">Err</span>(Error::InvalidLength { |
| expected: error::ExpectedLength::Any(<span class="kw-2">&</span>[ |
| adapter::Hyphenated::LENGTH, |
| adapter::Simple::LENGTH, |
| ]), |
| found: len, |
| })<span class="question-mark">?</span>; |
| } |
| |
| <span class="prelude-val">Err</span>(Error::InvalidGroupCount { |
| expected: error::ExpectedLength::Any(<span class="kw-2">&</span>[<span class="number">1</span>, <span class="number">5</span>]), |
| found: group + <span class="number">1</span>, |
| })<span class="question-mark">?</span>; |
| } |
| |
| <span class="kw">if </span>digit % <span class="number">2 </span>== <span class="number">0 </span>{ |
| <span class="comment">// First digit of the byte. |
| </span><span class="kw">match </span>chr { |
| <span class="comment">// Calulate upper half. |
| </span><span class="string">b'0'</span>..=<span class="string">b'9' </span>=> acc = chr - <span class="string">b'0'</span>, |
| <span class="string">b'a'</span>..=<span class="string">b'f' </span>=> acc = chr - <span class="string">b'a' </span>+ <span class="number">10</span>, |
| <span class="string">b'A'</span>..=<span class="string">b'F' </span>=> acc = chr - <span class="string">b'A' </span>+ <span class="number">10</span>, |
| <span class="comment">// Found a group delimiter |
| </span><span class="string">b'-' </span>=> { |
| <span class="comment">// TODO: remove the u8 cast |
| // BODY: this only needed until we switch to |
| // ParseError |
| </span><span class="kw">if </span>ACC_GROUP_LENS[group] <span class="kw">as </span>u8 != digit { |
| <span class="comment">// Calculate how many digits this group consists of |
| // in the input. |
| </span><span class="kw">let </span>found = <span class="kw">if </span>group > <span class="number">0 </span>{ |
| <span class="comment">// TODO: remove the u8 cast |
| // BODY: this only needed until we switch to |
| // ParseError |
| </span>digit - ACC_GROUP_LENS[group - <span class="number">1</span>] <span class="kw">as </span>u8 |
| } <span class="kw">else </span>{ |
| digit |
| }; |
| |
| <span class="prelude-val">Err</span>(Error::InvalidGroupLength { |
| expected: error::ExpectedLength::Exact( |
| GROUP_LENS[group], |
| ), |
| found: found <span class="kw">as </span>usize, |
| group, |
| })<span class="question-mark">?</span>; |
| } |
| <span class="comment">// Next group, decrement digit, it is incremented again |
| // at the bottom. |
| </span>group += <span class="number">1</span>; |
| digit -= <span class="number">1</span>; |
| } |
| <span class="kw">_ </span>=> { |
| <span class="prelude-val">Err</span>(Error::InvalidCharacter { |
| expected: <span class="string">"0123456789abcdefABCDEF-"</span>, |
| found: input[i_char..].chars().next().unwrap(), |
| index: i_char, |
| urn: error::UrnPrefix::Optional, |
| })<span class="question-mark">?</span>; |
| } |
| } |
| } <span class="kw">else </span>{ |
| <span class="comment">// Second digit of the byte, shift the upper half. |
| </span>acc <span class="kw-2">*</span>= <span class="number">16</span>; |
| <span class="kw">match </span>chr { |
| <span class="string">b'0'</span>..=<span class="string">b'9' </span>=> acc += chr - <span class="string">b'0'</span>, |
| <span class="string">b'a'</span>..=<span class="string">b'f' </span>=> acc += chr - <span class="string">b'a' </span>+ <span class="number">10</span>, |
| <span class="string">b'A'</span>..=<span class="string">b'F' </span>=> acc += chr - <span class="string">b'A' </span>+ <span class="number">10</span>, |
| <span class="string">b'-' </span>=> { |
| <span class="comment">// The byte isn't complete yet. |
| </span><span class="kw">let </span>found = <span class="kw">if </span>group > <span class="number">0 </span>{ |
| <span class="comment">// TODO: remove the u8 cast |
| // BODY: this only needed until we switch to |
| // ParseError |
| </span>digit - ACC_GROUP_LENS[group - <span class="number">1</span>] <span class="kw">as </span>u8 |
| } <span class="kw">else </span>{ |
| digit |
| }; |
| |
| <span class="prelude-val">Err</span>(Error::InvalidGroupLength { |
| expected: error::ExpectedLength::Exact( |
| GROUP_LENS[group], |
| ), |
| found: found <span class="kw">as </span>usize, |
| group, |
| })<span class="question-mark">?</span>; |
| } |
| <span class="kw">_ </span>=> { |
| <span class="prelude-val">Err</span>(Error::InvalidCharacter { |
| expected: <span class="string">"0123456789abcdefABCDEF-"</span>, |
| found: input[i_char..].chars().next().unwrap(), |
| index: i_char, |
| urn: error::UrnPrefix::Optional, |
| })<span class="question-mark">?</span>; |
| } |
| } |
| buffer[(digit / <span class="number">2</span>) <span class="kw">as </span>usize] = acc; |
| } |
| digit += <span class="number">1</span>; |
| } |
| |
| <span class="comment">// Now check the last group. |
| // TODO: remove the u8 cast |
| // BODY: this only needed until we switch to |
| // ParseError |
| </span><span class="kw">if </span>ACC_GROUP_LENS[<span class="number">4</span>] <span class="kw">as </span>u8 != digit { |
| <span class="prelude-val">Err</span>(Error::InvalidGroupLength { |
| expected: error::ExpectedLength::Exact(GROUP_LENS[<span class="number">4</span>]), |
| found: (digit <span class="kw">as </span>usize - ACC_GROUP_LENS[<span class="number">3</span>]), |
| group, |
| })<span class="question-mark">?</span>; |
| } |
| |
| <span class="prelude-val">Ok</span>(Uuid::from_bytes(buffer)) |
| } |
| } |
| |
| <span class="attribute">#[cfg(test)] |
| </span><span class="kw">mod </span>tests { |
| <span class="kw">use super</span>::<span class="kw-2">*</span>; |
| <span class="kw">use crate</span>::{adapter, std::string::ToString, test_util}; |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_parse_uuid_v4() { |
| <span class="kw">const </span>EXPECTED_UUID_LENGTHS: error::ExpectedLength = |
| error::ExpectedLength::Any(<span class="kw-2">&</span>[ |
| adapter::Hyphenated::LENGTH, |
| adapter::Simple::LENGTH, |
| ]); |
| |
| <span class="kw">const </span>EXPECTED_GROUP_COUNTS: error::ExpectedLength = |
| error::ExpectedLength::Any(<span class="kw-2">&</span>[<span class="number">1</span>, <span class="number">5</span>]); |
| |
| <span class="kw">const </span>EXPECTED_CHARS: <span class="kw-2">&</span><span class="lifetime">'static </span>str = <span class="string">"0123456789abcdefABCDEF-"</span>; |
| |
| <span class="comment">// Invalid |
| </span><span class="macro">assert_eq!</span>( |
| Uuid::parse_str(<span class="string">""</span>).map_err(<span class="kw">crate</span>::Error::expect_parser), |
| <span class="prelude-val">Err</span>(Error::InvalidLength { |
| expected: EXPECTED_UUID_LENGTHS, |
| found: <span class="number">0</span>, |
| }) |
| ); |
| |
| <span class="macro">assert_eq!</span>( |
| Uuid::parse_str(<span class="string">"!"</span>).map_err(<span class="kw">crate</span>::Error::expect_parser), |
| <span class="prelude-val">Err</span>(Error::InvalidLength { |
| expected: EXPECTED_UUID_LENGTHS, |
| found: <span class="number">1 |
| </span>}) |
| ); |
| |
| <span class="macro">assert_eq!</span>( |
| Uuid::parse_str(<span class="string">"F9168C5E-CEB2-4faa-B6BF-329BF39FA1E45"</span>) |
| .map_err(<span class="kw">crate</span>::Error::expect_parser), |
| <span class="prelude-val">Err</span>(Error::InvalidLength { |
| expected: EXPECTED_UUID_LENGTHS, |
| found: <span class="number">37</span>, |
| }) |
| ); |
| |
| <span class="macro">assert_eq!</span>( |
| Uuid::parse_str(<span class="string">"F9168C5E-CEB2-4faa-BBF-329BF39FA1E4"</span>) |
| .map_err(<span class="kw">crate</span>::Error::expect_parser), |
| <span class="prelude-val">Err</span>(Error::InvalidLength { |
| expected: EXPECTED_UUID_LENGTHS, |
| found: <span class="number">35 |
| </span>}) |
| ); |
| |
| <span class="macro">assert_eq!</span>( |
| Uuid::parse_str(<span class="string">"F9168C5E-CEB2-4faa-BGBF-329BF39FA1E4"</span>) |
| .map_err(<span class="kw">crate</span>::Error::expect_parser), |
| <span class="prelude-val">Err</span>(Error::InvalidCharacter { |
| expected: EXPECTED_CHARS, |
| found: <span class="string">'G'</span>, |
| index: <span class="number">20</span>, |
| urn: error::UrnPrefix::Optional, |
| }) |
| ); |
| |
| <span class="macro">assert_eq!</span>( |
| Uuid::parse_str(<span class="string">"F9168C5E-CEB2F4faaFB6BFF329BF39FA1E4"</span>) |
| .map_err(<span class="kw">crate</span>::Error::expect_parser), |
| <span class="prelude-val">Err</span>(Error::InvalidGroupCount { |
| expected: EXPECTED_GROUP_COUNTS, |
| found: <span class="number">2 |
| </span>}) |
| ); |
| |
| <span class="macro">assert_eq!</span>( |
| Uuid::parse_str(<span class="string">"F9168C5E-CEB2-4faaFB6BFF329BF39FA1E4"</span>) |
| .map_err(<span class="kw">crate</span>::Error::expect_parser), |
| <span class="prelude-val">Err</span>(Error::InvalidGroupCount { |
| expected: EXPECTED_GROUP_COUNTS, |
| found: <span class="number">3</span>, |
| }) |
| ); |
| |
| <span class="macro">assert_eq!</span>( |
| Uuid::parse_str(<span class="string">"F9168C5E-CEB2-4faa-B6BFF329BF39FA1E4"</span>) |
| .map_err(<span class="kw">crate</span>::Error::expect_parser), |
| <span class="prelude-val">Err</span>(Error::InvalidGroupCount { |
| expected: EXPECTED_GROUP_COUNTS, |
| found: <span class="number">4</span>, |
| }) |
| ); |
| |
| <span class="macro">assert_eq!</span>( |
| Uuid::parse_str(<span class="string">"F9168C5E-CEB2-4faa"</span>) |
| .map_err(<span class="kw">crate</span>::Error::expect_parser), |
| <span class="prelude-val">Err</span>(Error::InvalidLength { |
| expected: EXPECTED_UUID_LENGTHS, |
| found: <span class="number">18</span>, |
| }) |
| ); |
| |
| <span class="macro">assert_eq!</span>( |
| Uuid::parse_str(<span class="string">"F9168C5E-CEB2-4faaXB6BFF329BF39FA1E4"</span>) |
| .map_err(<span class="kw">crate</span>::Error::expect_parser), |
| <span class="prelude-val">Err</span>(Error::InvalidCharacter { |
| expected: EXPECTED_CHARS, |
| found: <span class="string">'X'</span>, |
| index: <span class="number">18</span>, |
| urn: error::UrnPrefix::Optional, |
| }) |
| ); |
| |
| <span class="macro">assert_eq!</span>( |
| Uuid::parse_str(<span class="string">"F9168C5E-CEB-24fa-eB6BFF32-BF39FA1E4"</span>) |
| .map_err(<span class="kw">crate</span>::Error::expect_parser), |
| <span class="prelude-val">Err</span>(Error::InvalidGroupLength { |
| expected: error::ExpectedLength::Exact(<span class="number">4</span>), |
| found: <span class="number">3</span>, |
| group: <span class="number">1</span>, |
| }) |
| ); |
| <span class="comment">// (group, found, expecting) |
| // |
| </span><span class="macro">assert_eq!</span>( |
| Uuid::parse_str(<span class="string">"01020304-1112-2122-3132-41424344"</span>) |
| .map_err(<span class="kw">crate</span>::Error::expect_parser), |
| <span class="prelude-val">Err</span>(Error::InvalidGroupLength { |
| expected: error::ExpectedLength::Exact(<span class="number">12</span>), |
| found: <span class="number">8</span>, |
| group: <span class="number">4</span>, |
| }) |
| ); |
| |
| <span class="macro">assert_eq!</span>( |
| Uuid::parse_str(<span class="string">"67e5504410b1426f9247bb680e5fe0c"</span>) |
| .map_err(<span class="kw">crate</span>::Error::expect_parser), |
| <span class="prelude-val">Err</span>(Error::InvalidLength { |
| expected: EXPECTED_UUID_LENGTHS, |
| found: <span class="number">31</span>, |
| }) |
| ); |
| |
| <span class="macro">assert_eq!</span>( |
| Uuid::parse_str(<span class="string">"67e5504410b1426f9247bb680e5fe0c88"</span>) |
| .map_err(<span class="kw">crate</span>::Error::expect_parser), |
| <span class="prelude-val">Err</span>(Error::InvalidLength { |
| expected: EXPECTED_UUID_LENGTHS, |
| found: <span class="number">33</span>, |
| }) |
| ); |
| |
| <span class="macro">assert_eq!</span>( |
| Uuid::parse_str(<span class="string">"67e5504410b1426f9247bb680e5fe0cg8"</span>) |
| .map_err(<span class="kw">crate</span>::Error::expect_parser), |
| <span class="prelude-val">Err</span>(Error::InvalidLength { |
| expected: EXPECTED_UUID_LENGTHS, |
| found: <span class="number">33</span>, |
| }) |
| ); |
| |
| <span class="macro">assert_eq!</span>( |
| Uuid::parse_str(<span class="string">"67e5504410b1426%9247bb680e5fe0c8"</span>) |
| .map_err(<span class="kw">crate</span>::Error::expect_parser), |
| <span class="prelude-val">Err</span>(Error::InvalidCharacter { |
| expected: EXPECTED_CHARS, |
| found: <span class="string">'%'</span>, |
| index: <span class="number">15</span>, |
| urn: error::UrnPrefix::Optional, |
| }) |
| ); |
| |
| <span class="macro">assert_eq!</span>( |
| Uuid::parse_str(<span class="string">"231231212212423424324323477343246663"</span>) |
| .map_err(<span class="kw">crate</span>::Error::expect_parser), |
| <span class="prelude-val">Err</span>(Error::InvalidLength { |
| expected: EXPECTED_UUID_LENGTHS, |
| found: <span class="number">36</span>, |
| }) |
| ); |
| |
| <span class="comment">// Valid |
| </span><span class="macro">assert!</span>(Uuid::parse_str(<span class="string">"00000000000000000000000000000000"</span>).is_ok()); |
| <span class="macro">assert!</span>(Uuid::parse_str(<span class="string">"67e55044-10b1-426f-9247-bb680e5fe0c8"</span>).is_ok()); |
| <span class="macro">assert!</span>(Uuid::parse_str(<span class="string">"F9168C5E-CEB2-4faa-B6BF-329BF39FA1E4"</span>).is_ok()); |
| <span class="macro">assert!</span>(Uuid::parse_str(<span class="string">"67e5504410b1426f9247bb680e5fe0c8"</span>).is_ok()); |
| <span class="macro">assert!</span>(Uuid::parse_str(<span class="string">"01020304-1112-2122-3132-414243444546"</span>).is_ok()); |
| <span class="macro">assert!</span>(Uuid::parse_str( |
| <span class="string">"urn:uuid:67e55044-10b1-426f-9247-bb680e5fe0c8" |
| </span>) |
| .is_ok()); |
| |
| <span class="comment">// Nil |
| </span><span class="kw">let </span>nil = Uuid::nil(); |
| <span class="macro">assert_eq!</span>( |
| Uuid::parse_str(<span class="string">"00000000000000000000000000000000"</span>).unwrap(), |
| nil |
| ); |
| <span class="macro">assert_eq!</span>( |
| Uuid::parse_str(<span class="string">"00000000-0000-0000-0000-000000000000"</span>).unwrap(), |
| nil |
| ); |
| |
| <span class="comment">// Round-trip |
| </span><span class="kw">let </span>uuid_orig = test_util::new(); |
| <span class="kw">let </span>orig_str = uuid_orig.to_string(); |
| <span class="kw">let </span>uuid_out = Uuid::parse_str(<span class="kw-2">&</span>orig_str).unwrap(); |
| <span class="macro">assert_eq!</span>(uuid_orig, uuid_out); |
| |
| <span class="comment">// Test error reporting |
| </span><span class="macro">assert_eq!</span>( |
| Uuid::parse_str(<span class="string">"67e5504410b1426f9247bb680e5fe0c"</span>) |
| .map_err(<span class="kw">crate</span>::Error::expect_parser), |
| <span class="prelude-val">Err</span>(Error::InvalidLength { |
| expected: EXPECTED_UUID_LENGTHS, |
| found: <span class="number">31</span>, |
| }) |
| ); |
| <span class="macro">assert_eq!</span>( |
| Uuid::parse_str(<span class="string">"67e550X410b1426f9247bb680e5fe0cd"</span>) |
| .map_err(<span class="kw">crate</span>::Error::expect_parser), |
| <span class="prelude-val">Err</span>(Error::InvalidCharacter { |
| expected: EXPECTED_CHARS, |
| found: <span class="string">'X'</span>, |
| index: <span class="number">6</span>, |
| urn: error::UrnPrefix::Optional, |
| }) |
| ); |
| <span class="macro">assert_eq!</span>( |
| Uuid::parse_str(<span class="string">"67e550-4105b1426f9247bb680e5fe0c"</span>) |
| .map_err(<span class="kw">crate</span>::Error::expect_parser), |
| <span class="prelude-val">Err</span>(Error::InvalidGroupLength { |
| expected: error::ExpectedLength::Exact(<span class="number">8</span>), |
| found: <span class="number">6</span>, |
| group: <span class="number">0</span>, |
| }) |
| ); |
| <span class="macro">assert_eq!</span>( |
| Uuid::parse_str(<span class="string">"F9168C5E-CEB2-4faa-B6BF1-02BF39FA1E4"</span>) |
| .map_err(<span class="kw">crate</span>::Error::expect_parser), |
| <span class="prelude-val">Err</span>(Error::InvalidGroupLength { |
| expected: error::ExpectedLength::Exact(<span class="number">4</span>), |
| found: <span class="number">5</span>, |
| group: <span class="number">3</span>, |
| }) |
| ); |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../../" data-current-crate="uuid" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
