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</pre><pre class="rust"><code><span class="kw">use </span>std::str::CharIndices;
<span class="kw">use super</span>::{BoxTokenStream, Token, TokenStream, Tokenizer};
<span class="doccomment">/// Tokenize the text by splitting on whitespaces and punctuation.
</span><span class="attribute">#[derive(Clone)]
</span><span class="kw">pub struct </span>SimpleTokenizer;
<span class="kw">pub struct </span>SimpleTokenStream&lt;<span class="lifetime">&#39;a</span>&gt; {
text: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>str,
chars: CharIndices&lt;<span class="lifetime">&#39;a</span>&gt;,
token: Token,
}
<span class="kw">impl </span>Tokenizer <span class="kw">for </span>SimpleTokenizer {
<span class="kw">fn </span>token_stream&lt;<span class="lifetime">&#39;a</span>&gt;(<span class="kw-2">&amp;</span><span class="self">self</span>, text: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>str) -&gt; BoxTokenStream&lt;<span class="lifetime">&#39;a</span>&gt; {
BoxTokenStream::from(SimpleTokenStream {
text,
chars: text.char_indices(),
token: Token::default(),
})
}
}
<span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; SimpleTokenStream&lt;<span class="lifetime">&#39;a</span>&gt; {
<span class="comment">// search for the end of the current token.
</span><span class="kw">fn </span>search_token_end(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; usize {
(<span class="kw-2">&amp;mut </span><span class="self">self</span>.chars)
.filter(|<span class="kw-2">&amp;</span>(<span class="kw">_</span>, <span class="kw-2">ref </span>c)| !c.is_alphanumeric())
.map(|(offset, <span class="kw">_</span>)| offset)
.next()
.unwrap_or(<span class="self">self</span>.text.len())
}
}
<span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; TokenStream <span class="kw">for </span>SimpleTokenStream&lt;<span class="lifetime">&#39;a</span>&gt; {
<span class="kw">fn </span>advance(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; bool {
<span class="self">self</span>.token.text.clear();
<span class="self">self</span>.token.position = <span class="self">self</span>.token.position.wrapping_add(<span class="number">1</span>);
<span class="kw">while let </span><span class="prelude-val">Some</span>((offset_from, c)) = <span class="self">self</span>.chars.next() {
<span class="kw">if </span>c.is_alphanumeric() {
<span class="kw">let </span>offset_to = <span class="self">self</span>.search_token_end();
<span class="self">self</span>.token.offset_from = offset_from;
<span class="self">self</span>.token.offset_to = offset_to;
<span class="self">self</span>.token.text.push_str(<span class="kw-2">&amp;</span><span class="self">self</span>.text[offset_from..offset_to]);
<span class="kw">return </span><span class="bool-val">true</span>;
}
}
<span class="bool-val">false
</span>}
<span class="kw">fn </span>token(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span>Token {
<span class="kw-2">&amp;</span><span class="self">self</span>.token
}
<span class="kw">fn </span>token_mut(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;mut </span>Token {
<span class="kw-2">&amp;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">crate</span>::tokenizer::tests::assert_token;
<span class="kw">use </span><span class="kw">crate</span>::tokenizer::{SimpleTokenizer, TextAnalyzer, Token};
<span class="attribute">#[test]
</span><span class="kw">fn </span>test_simple_tokenizer() {
<span class="kw">let </span>tokens = token_stream_helper(<span class="string">&quot;Hello, happy tax payer!&quot;</span>);
<span class="macro">assert_eq!</span>(tokens.len(), <span class="number">4</span>);
assert_token(<span class="kw-2">&amp;</span>tokens[<span class="number">0</span>], <span class="number">0</span>, <span class="string">&quot;Hello&quot;</span>, <span class="number">0</span>, <span class="number">5</span>);
assert_token(<span class="kw-2">&amp;</span>tokens[<span class="number">1</span>], <span class="number">1</span>, <span class="string">&quot;happy&quot;</span>, <span class="number">7</span>, <span class="number">12</span>);
assert_token(<span class="kw-2">&amp;</span>tokens[<span class="number">2</span>], <span class="number">2</span>, <span class="string">&quot;tax&quot;</span>, <span class="number">13</span>, <span class="number">16</span>);
assert_token(<span class="kw-2">&amp;</span>tokens[<span class="number">3</span>], <span class="number">3</span>, <span class="string">&quot;payer&quot;</span>, <span class="number">17</span>, <span class="number">22</span>);
}
<span class="kw">fn </span>token_stream_helper(text: <span class="kw-2">&amp;</span>str) -&gt; Vec&lt;Token&gt; {
<span class="kw">let </span>a = TextAnalyzer::from(SimpleTokenizer);
<span class="kw">let </span><span class="kw-2">mut </span>token_stream = a.token_stream(text);
<span class="kw">let </span><span class="kw-2">mut </span>tokens: Vec&lt;Token&gt; = <span class="macro">vec!</span>[];
<span class="kw">let </span><span class="kw-2">mut </span>add_token = |token: <span class="kw-2">&amp;</span>Token| {
tokens.push(token.clone());
};
token_stream.process(<span class="kw-2">&amp;mut </span>add_token);
tokens
}
}
</code></pre></div>
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