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| </pre><pre class="rust"><code><span class="kw">use super</span>::{BoxTokenStream, Token, TokenStream, Tokenizer}; |
| <span class="kw">use </span><span class="kw">crate</span>::schema::FACET_SEP_BYTE; |
| |
| <span class="doccomment">/// The `FacetTokenizer` process a `Facet` binary representation |
| /// and emits a token for all of its parent. |
| /// |
| /// For instance, `/america/north_america/canada` |
| /// will emit the three following tokens |
| /// - `/america/north_america/canada` |
| /// - `/america/north_america` |
| /// - `/america` |
| </span><span class="attribute">#[derive(Clone)] |
| </span><span class="kw">pub struct </span>FacetTokenizer; |
| |
| <span class="attribute">#[derive(Debug)] |
| </span><span class="kw">enum </span>State { |
| RootFacetNotEmitted, |
| UpToPosition(usize), <span class="comment">//< we already emitted facet prefix up to &text[..cursor] |
| </span>Terminated, |
| } |
| |
| <span class="kw">pub struct </span>FacetTokenStream<<span class="lifetime">'a</span>> { |
| text: <span class="kw-2">&</span><span class="lifetime">'a </span>str, |
| state: State, |
| token: Token, |
| } |
| |
| <span class="kw">impl </span>Tokenizer <span class="kw">for </span>FacetTokenizer { |
| <span class="kw">fn </span>token_stream<<span class="lifetime">'a</span>>(<span class="kw-2">&</span><span class="self">self</span>, text: <span class="kw-2">&</span><span class="lifetime">'a </span>str) -> BoxTokenStream<<span class="lifetime">'a</span>> { |
| FacetTokenStream { |
| text, |
| state: State::RootFacetNotEmitted, <span class="comment">//< pos is the first char that has not been processed yet. |
| </span>token: Token::default(), |
| } |
| .into() |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>> TokenStream <span class="kw">for </span>FacetTokenStream<<span class="lifetime">'a</span>> { |
| <span class="kw">fn </span>advance(<span class="kw-2">&mut </span><span class="self">self</span>) -> bool { |
| <span class="kw">match </span><span class="self">self</span>.state { |
| State::RootFacetNotEmitted => { |
| <span class="self">self</span>.state = <span class="kw">if </span><span class="self">self</span>.text.is_empty() { |
| State::Terminated |
| } <span class="kw">else </span>{ |
| State::UpToPosition(<span class="number">0</span>) |
| }; |
| <span class="bool-val">true |
| </span>} |
| State::UpToPosition(cursor) => { |
| <span class="kw">let </span>bytes: <span class="kw-2">&</span>[u8] = <span class="self">self</span>.text.as_bytes(); |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(next_sep_pos) = bytes[cursor + <span class="number">1</span>..] |
| .iter() |
| .cloned() |
| .position(|b| b == FACET_SEP_BYTE) |
| .map(|pos| cursor + <span class="number">1 </span>+ pos) |
| { |
| <span class="kw">let </span>facet_part = <span class="kw-2">&</span><span class="self">self</span>.text[cursor..next_sep_pos]; |
| <span class="self">self</span>.token.text.push_str(facet_part); |
| <span class="self">self</span>.state = State::UpToPosition(next_sep_pos); |
| } <span class="kw">else </span>{ |
| <span class="kw">let </span>facet_part = <span class="kw-2">&</span><span class="self">self</span>.text[cursor..]; |
| <span class="self">self</span>.token.text.push_str(facet_part); |
| <span class="self">self</span>.state = State::Terminated; |
| } |
| <span class="bool-val">true |
| </span>} |
| State::Terminated => <span class="bool-val">false</span>, |
| } |
| } |
| |
| <span class="kw">fn </span>token(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>Token { |
| <span class="kw-2">&</span><span class="self">self</span>.token |
| } |
| |
| <span class="kw">fn </span>token_mut(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="kw-2">&mut </span>Token { |
| <span class="kw-2">&mut </span><span class="self">self</span>.token |
| } |
| } |
| |
| <span class="attribute">#[cfg(test)] |
| </span><span class="kw">mod </span>tests { |
| |
| <span class="kw">use </span><span class="kw">super</span>::FacetTokenizer; |
| <span class="kw">use </span><span class="kw">crate</span>::schema::Facet; |
| <span class="kw">use </span><span class="kw">crate</span>::tokenizer::{Token, Tokenizer}; |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_facet_tokenizer() { |
| <span class="kw">let </span>facet = Facet::from_path(<span class="macro">vec!</span>[<span class="string">"top"</span>, <span class="string">"a"</span>, <span class="string">"b"</span>]); |
| <span class="kw">let </span><span class="kw-2">mut </span>tokens = <span class="macro">vec!</span>[]; |
| { |
| <span class="kw">let </span><span class="kw-2">mut </span>add_token = |token: <span class="kw-2">&</span>Token| { |
| <span class="kw">let </span>facet = Facet::from_encoded(token.text.as_bytes().to_owned()).unwrap(); |
| tokens.push(<span class="macro">format!</span>(<span class="string">"{}"</span>, facet)); |
| }; |
| FacetTokenizer |
| .token_stream(facet.encoded_str()) |
| .process(<span class="kw-2">&mut </span>add_token); |
| } |
| <span class="macro">assert_eq!</span>(tokens.len(), <span class="number">4</span>); |
| <span class="macro">assert_eq!</span>(tokens[<span class="number">0</span>], <span class="string">"/"</span>); |
| <span class="macro">assert_eq!</span>(tokens[<span class="number">1</span>], <span class="string">"/top"</span>); |
| <span class="macro">assert_eq!</span>(tokens[<span class="number">2</span>], <span class="string">"/top/a"</span>); |
| <span class="macro">assert_eq!</span>(tokens[<span class="number">3</span>], <span class="string">"/top/a/b"</span>); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_facet_tokenizer_root_facets() { |
| <span class="kw">let </span>facet = Facet::root(); |
| <span class="kw">let </span><span class="kw-2">mut </span>tokens = <span class="macro">vec!</span>[]; |
| { |
| <span class="kw">let </span><span class="kw-2">mut </span>add_token = |token: <span class="kw-2">&</span>Token| { |
| <span class="kw">let </span>facet = Facet::from_encoded(token.text.as_bytes().to_owned()).unwrap(); <span class="comment">// ok test |
| </span>tokens.push(<span class="macro">format!</span>(<span class="string">"{}"</span>, facet)); |
| }; |
| FacetTokenizer |
| .token_stream(facet.encoded_str()) <span class="comment">// ok test |
| </span>.process(<span class="kw-2">&mut </span>add_token); |
| } |
| <span class="macro">assert_eq!</span>(tokens.len(), <span class="number">1</span>); |
| <span class="macro">assert_eq!</span>(tokens[<span class="number">0</span>], <span class="string">"/"</span>); |
| } |
| } |
| </code></pre></div> |
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