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 </pre><pre class="rust"><code><span class="kw">use super</span>::{Token, TokenStream, Tokenizer};
 <span class="kw">use </span><span class="kw">crate</span>::tokenizer::BoxTokenStream;

 <span class="doccomment">/// Tokenize the text by splitting words into n-grams of the given size(s)
 ///
 /// With this tokenizer, the `position` is always 0.
 /// Beware however, in presence of multiple value for the same field,
 /// the position will be `POSITION_GAP * index of value`.
 ///
 /// Example 1: `hello` would be tokenized as (min_gram: 2, max_gram: 3, prefix_only: false)
 ///
 /// | Term     | he  | hel | el  | ell | ll  | llo | lo |
 /// |----------|-----|-----|-----|-----|-----|-----|----|
 /// | Position | 0   | 0   | 0   | 0   | 0   | 0   | 0  |
 /// | Offsets  | 0,2 | 0,3 | 1,3 | 1,4 | 2,4 | 2,5 | 3,5|
 ///
 /// Example 2: `hello` would be tokenized as (min_gram: 2, max_gram: 5, prefix_only: **true**)
 ///
 /// | Term     | he  | hel | hell  | hello |
 /// |----------|-----|-----|-------|-------|
 /// | Position | 0   | 0   | 0     | 0     |
 /// | Offsets  | 0,2 | 0,3 | 0,4   | 0,5   |
 ///
 /// Example 3: `hεllo` (non-ascii) would be tokenized as (min_gram: 2, max_gram: 5, prefix_only:
 /// **true**)
 ///
 /// | Term     | hε  | hεl | hεll  | hεllo |
 /// |----------|-----|-----|-------|-------|
 /// | Position | 0   | 0   | 0     | 0     |
 /// | Offsets  | 0,3 | 0,4 | 0,5   | 0,6   |
 ///
 /// # Example
 ///
 /// ```rust
 /// use tantivy::tokenizer::*;
 ///
 /// let tokenizer = NgramTokenizer::new(2, 3, false);
 /// let mut stream = tokenizer.token_stream(&quot;hello&quot;);
 /// {
 ///     let token = stream.next().unwrap();
 ///     assert_eq!(token.text, &quot;he&quot;);
 ///     assert_eq!(token.offset_from, 0);
 ///     assert_eq!(token.offset_to, 2);
 /// }
 /// {
 ///   let token = stream.next().unwrap();
 ///     assert_eq!(token.text, &quot;hel&quot;);
 ///     assert_eq!(token.offset_from, 0);
 ///     assert_eq!(token.offset_to, 3);
 /// }
 /// {
 ///   let token = stream.next().unwrap();
 ///     assert_eq!(token.text, &quot;el&quot;);
 ///     assert_eq!(token.offset_from, 1);
 ///     assert_eq!(token.offset_to, 3);
 /// }
 /// {
 ///   let token = stream.next().unwrap();
 ///     assert_eq!(token.text, &quot;ell&quot;);
 ///     assert_eq!(token.offset_from, 1);
 ///     assert_eq!(token.offset_to, 4);
 /// }
 /// {
 ///   let token = stream.next().unwrap();
 ///     assert_eq!(token.text, &quot;ll&quot;);
 ///     assert_eq!(token.offset_from, 2);
 ///     assert_eq!(token.offset_to, 4);
 /// }
 /// {
 ///   let token = stream.next().unwrap();
 ///     assert_eq!(token.text, &quot;llo&quot;);
 ///     assert_eq!(token.offset_from, 2);
 ///     assert_eq!(token.offset_to, 5);
 /// }
 /// {
 ///   let token = stream.next().unwrap();
 ///   assert_eq!(token.text, &quot;lo&quot;);
 ///   assert_eq!(token.offset_from, 3);
 ///   assert_eq!(token.offset_to, 5);
 /// }
 /// assert!(stream.next().is_none());
 /// ```
 </span><span class="attribute">#[derive(Clone)]
 </span><span class="kw">pub struct </span>NgramTokenizer {
     <span class="doccomment">/// min size of the n-gram
     </span>min_gram: usize,
     <span class="doccomment">/// max size of the n-gram
     </span>max_gram: usize,
     <span class="doccomment">/// if true, will only parse the leading edge of the input
     </span>prefix_only: bool,
 }

 <span class="kw">impl </span>NgramTokenizer {
     <span class="doccomment">/// Configures a new Ngram tokenizer
     </span><span class="kw">pub fn </span>new(min_gram: usize, max_gram: usize, prefix_only: bool) -&gt; NgramTokenizer {
         <span class="macro">assert!</span>(min_gram &gt; <span class="number">0</span>, <span class="string">&quot;min_gram must be greater than 0&quot;</span>);
         <span class="macro">assert!</span>(
             min_gram &lt;= max_gram,
             <span class="string">&quot;min_gram must not be greater than max_gram&quot;
         </span>);
         NgramTokenizer {
             min_gram,
             max_gram,
             prefix_only,
         }
     }

     <span class="doccomment">/// Create a `NGramTokenizer` which generates tokens for all inner ngrams.
     ///
     /// This is as opposed to only prefix ngrams    .
     </span><span class="kw">pub fn </span>all_ngrams(min_gram: usize, max_gram: usize) -&gt; NgramTokenizer {
         <span class="self">Self</span>::new(min_gram, max_gram, <span class="bool-val">false</span>)
     }

     <span class="doccomment">/// Create a `NGramTokenizer` which only generates tokens for the
     /// prefix ngrams.
     </span><span class="kw">pub fn </span>prefix_only(min_gram: usize, max_gram: usize) -&gt; NgramTokenizer {
         <span class="self">Self</span>::new(min_gram, max_gram, <span class="bool-val">true</span>)
     }
 }

 <span class="doccomment">/// TokenStream associate to the `NgramTokenizer`
 </span><span class="kw">pub struct </span>NgramTokenStream&lt;<span class="lifetime">&#39;a</span>&gt; {
     <span class="doccomment">/// parameters
     </span>ngram_charidx_iterator: StutteringIterator&lt;CodepointFrontiers&lt;<span class="lifetime">&#39;a</span>&gt;&gt;,
     <span class="doccomment">/// true if the NgramTokenStream is in prefix mode.
     </span>prefix_only: bool,
     <span class="doccomment">/// input
     </span>text: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>str,
     <span class="doccomment">/// output
     </span>token: Token,
 }

 <span class="kw">impl </span>Tokenizer <span class="kw">for </span>NgramTokenizer {
     <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; {
         From::from(NgramTokenStream {
             ngram_charidx_iterator: StutteringIterator::new(
                 CodepointFrontiers::for_str(text),
                 <span class="self">self</span>.min_gram,
                 <span class="self">self</span>.max_gram,
             ),
             prefix_only: <span class="self">self</span>.prefix_only,
             text,
             token: Token::default(),
         })
     }
 }

 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; TokenStream <span class="kw">for </span>NgramTokenStream&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="kw">if let </span><span class="prelude-val">Some</span>((offset_from, offset_to)) = <span class="self">self</span>.ngram_charidx_iterator.next() {
             <span class="kw">if </span><span class="self">self</span>.prefix_only &amp;&amp; offset_from &gt; <span class="number">0 </span>{
                 <span class="kw">return </span><span class="bool-val">false</span>;
             }
             <span class="self">self</span>.token.position = <span class="number">0</span>;
             <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.clear();
             <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="bool-val">true
         </span>} <span class="kw">else </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="doccomment">/// This iterator takes an underlying Iterator
 /// and emits all of the pairs `(a,b)` such that
 /// a and b are items emitted by the iterator at
 /// an interval between `min_gram` and `max_gram`.
 ///
 /// The elements are emitted in the order of appearance
 /// of `a` first, `b` then.
 ///
 /// See `test_stutterring_iterator` for an example of its
 /// output.
 </span><span class="kw">struct </span>StutteringIterator&lt;T&gt; {
     underlying: T,
     min_gram: usize,
     max_gram: usize,

     memory: Vec&lt;usize&gt;,
     cursor: usize,
     gram_len: usize,
 }

 <span class="kw">impl</span>&lt;T&gt; StutteringIterator&lt;T&gt;
 <span class="kw">where </span>T: Iterator&lt;Item = usize&gt;
 {
     <span class="kw">pub fn </span>new(<span class="kw-2">mut </span>underlying: T, min_gram: usize, max_gram: usize) -&gt; StutteringIterator&lt;T&gt; {
         <span class="macro">assert!</span>(min_gram &gt; <span class="number">0</span>);
         <span class="kw">let </span>memory: Vec&lt;usize&gt; = (<span class="kw-2">&amp;mut </span>underlying).take(max_gram + <span class="number">1</span>).collect();
         <span class="kw">if </span>memory.len() &lt;= min_gram {
             <span class="comment">// returns an empty iterator
             </span>StutteringIterator {
                 underlying,
                 min_gram: <span class="number">1</span>,
                 max_gram: <span class="number">0</span>,
                 memory,
                 cursor: <span class="number">0</span>,
                 gram_len: <span class="number">0</span>,
             }
         } <span class="kw">else </span>{
             StutteringIterator {
                 underlying,
                 min_gram,
                 max_gram: memory.len() - <span class="number">1</span>,
                 memory,
                 cursor: <span class="number">0</span>,
                 gram_len: min_gram,
             }
         }
     }
 }

 <span class="kw">impl</span>&lt;T&gt; Iterator <span class="kw">for </span>StutteringIterator&lt;T&gt;
 <span class="kw">where </span>T: Iterator&lt;Item = usize&gt;
 {
     <span class="kw">type </span>Item = (usize, usize);

     <span class="kw">fn </span>next(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;(usize, usize)&gt; {
         <span class="kw">if </span><span class="self">self</span>.gram_len &gt; <span class="self">self</span>.max_gram {
             <span class="comment">// we have exhausted all options
             // starting at `self.memory[self.cursor]`.
             //
             // Time to advance.
             </span><span class="self">self</span>.gram_len = <span class="self">self</span>.min_gram;
             <span class="kw">if let </span><span class="prelude-val">Some</span>(next_val) = <span class="self">self</span>.underlying.next() {
                 <span class="self">self</span>.memory[<span class="self">self</span>.cursor] = next_val;
             } <span class="kw">else </span>{
                 <span class="self">self</span>.max_gram -= <span class="number">1</span>;
             }
             <span class="self">self</span>.cursor += <span class="number">1</span>;
             <span class="kw">if </span><span class="self">self</span>.cursor &gt;= <span class="self">self</span>.memory.len() {
                 <span class="self">self</span>.cursor = <span class="number">0</span>;
             }
         }
         <span class="kw">if </span><span class="self">self</span>.max_gram &lt; <span class="self">self</span>.min_gram {
             <span class="kw">return </span><span class="prelude-val">None</span>;
         }
         <span class="kw">let </span>start = <span class="self">self</span>.memory[<span class="self">self</span>.cursor % <span class="self">self</span>.memory.len()];
         <span class="kw">let </span>stop = <span class="self">self</span>.memory[(<span class="self">self</span>.cursor + <span class="self">self</span>.gram_len) % <span class="self">self</span>.memory.len()];
         <span class="self">self</span>.gram_len += <span class="number">1</span>;
         <span class="prelude-val">Some</span>((start, stop))
     }
 }

 <span class="doccomment">/// Emits all of the offsets where a codepoint starts
 /// or a codepoint ends.
 ///
 /// By convention, we emit `[0]` for the empty string.
 </span><span class="kw">struct </span>CodepointFrontiers&lt;<span class="lifetime">&#39;a</span>&gt; {
     s: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>str,
     next_el: <span class="prelude-ty">Option</span>&lt;usize&gt;,
 }

 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; CodepointFrontiers&lt;<span class="lifetime">&#39;a</span>&gt; {
     <span class="kw">fn </span>for_str(s: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>str) -&gt; <span class="self">Self </span>{
         CodepointFrontiers {
             s,
             next_el: <span class="prelude-val">Some</span>(<span class="number">0</span>),
         }
     }
 }

 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; Iterator <span class="kw">for </span>CodepointFrontiers&lt;<span class="lifetime">&#39;a</span>&gt; {
     <span class="kw">type </span>Item = usize;

     <span class="kw">fn </span>next(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;usize&gt; {
         <span class="self">self</span>.next_el.map(|offset| {
             <span class="kw">if </span><span class="self">self</span>.s.is_empty() {
                 <span class="self">self</span>.next_el = <span class="prelude-val">None</span>;
             } <span class="kw">else </span>{
                 <span class="kw">let </span>first_codepoint_width = utf8_codepoint_width(<span class="self">self</span>.s.as_bytes()[<span class="number">0</span>]);
                 <span class="self">self</span>.s = <span class="kw-2">&amp;</span><span class="self">self</span>.s[first_codepoint_width..];
                 <span class="self">self</span>.next_el = <span class="prelude-val">Some</span>(offset + first_codepoint_width);
             }
             offset
         })
     }
 }

 <span class="kw">const </span>CODEPOINT_UTF8_WIDTH: [u8; <span class="number">16</span>] = [<span class="number">1</span>, <span class="number">1</span>, <span class="number">1</span>, <span class="number">1</span>, <span class="number">1</span>, <span class="number">1</span>, <span class="number">1</span>, <span class="number">1</span>, <span class="number">2</span>, <span class="number">2</span>, <span class="number">2</span>, <span class="number">2</span>, <span class="number">2</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>];

 <span class="comment">// Number of bytes to encode a codepoint in UTF-8 given
 // the first byte.
 //
 // To do that we count the number of higher significant bits set to `1`.
 </span><span class="kw">fn </span>utf8_codepoint_width(b: u8) -&gt; usize {
     <span class="kw">let </span>higher_4_bits = (b <span class="kw">as </span>usize) &gt;&gt; <span class="number">4</span>;
     CODEPOINT_UTF8_WIDTH[higher_4_bits] <span class="kw">as </span>usize
 }

 <span class="attribute">#[cfg(test)]
 </span><span class="kw">mod </span>tests {

     <span class="kw">use super</span>::{utf8_codepoint_width, CodepointFrontiers, NgramTokenizer, StutteringIterator};
     <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::tokenizer::Tokenizer;
     <span class="kw">use </span><span class="kw">crate</span>::tokenizer::{BoxTokenStream, Token};

     <span class="kw">fn </span>test_helper(<span class="kw-2">mut </span>tokenizer: BoxTokenStream) -&gt; Vec&lt;Token&gt; {
         <span class="kw">let </span><span class="kw-2">mut </span>tokens: Vec&lt;Token&gt; = <span class="macro">vec!</span>[];
         tokenizer.process(<span class="kw-2">&amp;mut </span>|token: <span class="kw-2">&amp;</span>Token| tokens.push(token.clone()));
         tokens
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_utf8_codepoint_width() {
         <span class="comment">// 0xxx
         </span><span class="kw">for </span>i <span class="kw">in </span><span class="number">0</span>..<span class="number">128 </span>{
             <span class="macro">assert_eq!</span>(utf8_codepoint_width(i), <span class="number">1</span>);
         }
         <span class="comment">// 110xx
         </span><span class="kw">for </span>i <span class="kw">in </span>(<span class="number">128 </span>| <span class="number">64</span>)..(<span class="number">128 </span>| <span class="number">64 </span>| <span class="number">32</span>) {
             <span class="macro">assert_eq!</span>(utf8_codepoint_width(i), <span class="number">2</span>);
         }
         <span class="comment">// 1110xx
         </span><span class="kw">for </span>i <span class="kw">in </span>(<span class="number">128 </span>| <span class="number">64 </span>| <span class="number">32</span>)..(<span class="number">128 </span>| <span class="number">64 </span>| <span class="number">32 </span>| <span class="number">16</span>) {
             <span class="macro">assert_eq!</span>(utf8_codepoint_width(i), <span class="number">3</span>);
         }
         <span class="comment">// 1111xx
         </span><span class="kw">for </span>i <span class="kw">in </span>(<span class="number">128 </span>| <span class="number">64 </span>| <span class="number">32 </span>| <span class="number">16</span>)..<span class="number">256 </span>{
             <span class="macro">assert_eq!</span>(utf8_codepoint_width(i <span class="kw">as </span>u8), <span class="number">4</span>);
         }
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_codepoint_frontiers() {
         <span class="macro">assert_eq!</span>(CodepointFrontiers::for_str(<span class="string">&quot;&quot;</span>).collect::&lt;Vec&lt;<span class="kw">_</span>&gt;&gt;(), <span class="macro">vec!</span>[<span class="number">0</span>]);
         <span class="macro">assert_eq!</span>(
             CodepointFrontiers::for_str(<span class="string">&quot;abcd&quot;</span>).collect::&lt;Vec&lt;<span class="kw">_</span>&gt;&gt;(),
             <span class="macro">vec!</span>[<span class="number">0</span>, <span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>]
         );
         <span class="macro">assert_eq!</span>(
             CodepointFrontiers::for_str(<span class="string">&quot;aあ&quot;</span>).collect::&lt;Vec&lt;<span class="kw">_</span>&gt;&gt;(),
             <span class="macro">vec!</span>[<span class="number">0</span>, <span class="number">1</span>, <span class="number">4</span>]
         );
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_ngram_tokenizer_1_2_false() {
         <span class="kw">let </span>tokens = test_helper(NgramTokenizer::all_ngrams(<span class="number">1</span>, <span class="number">2</span>).token_stream(<span class="string">&quot;hello&quot;</span>));
         <span class="macro">assert_eq!</span>(tokens.len(), <span class="number">9</span>);
         assert_token(<span class="kw-2">&amp;</span>tokens[<span class="number">0</span>], <span class="number">0</span>, <span class="string">&quot;h&quot;</span>, <span class="number">0</span>, <span class="number">1</span>);
         assert_token(<span class="kw-2">&amp;</span>tokens[<span class="number">1</span>], <span class="number">0</span>, <span class="string">&quot;he&quot;</span>, <span class="number">0</span>, <span class="number">2</span>);
         assert_token(<span class="kw-2">&amp;</span>tokens[<span class="number">2</span>], <span class="number">0</span>, <span class="string">&quot;e&quot;</span>, <span class="number">1</span>, <span class="number">2</span>);
         assert_token(<span class="kw-2">&amp;</span>tokens[<span class="number">3</span>], <span class="number">0</span>, <span class="string">&quot;el&quot;</span>, <span class="number">1</span>, <span class="number">3</span>);
         assert_token(<span class="kw-2">&amp;</span>tokens[<span class="number">4</span>], <span class="number">0</span>, <span class="string">&quot;l&quot;</span>, <span class="number">2</span>, <span class="number">3</span>);
         assert_token(<span class="kw-2">&amp;</span>tokens[<span class="number">5</span>], <span class="number">0</span>, <span class="string">&quot;ll&quot;</span>, <span class="number">2</span>, <span class="number">4</span>);
         assert_token(<span class="kw-2">&amp;</span>tokens[<span class="number">6</span>], <span class="number">0</span>, <span class="string">&quot;l&quot;</span>, <span class="number">3</span>, <span class="number">4</span>);
         assert_token(<span class="kw-2">&amp;</span>tokens[<span class="number">7</span>], <span class="number">0</span>, <span class="string">&quot;lo&quot;</span>, <span class="number">3</span>, <span class="number">5</span>);
         assert_token(<span class="kw-2">&amp;</span>tokens[<span class="number">8</span>], <span class="number">0</span>, <span class="string">&quot;o&quot;</span>, <span class="number">4</span>, <span class="number">5</span>);
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_ngram_tokenizer_min_max_equal() {
         <span class="kw">let </span>tokens = test_helper(NgramTokenizer::all_ngrams(<span class="number">3</span>, <span class="number">3</span>).token_stream(<span class="string">&quot;hello&quot;</span>));
         <span class="macro">assert_eq!</span>(tokens.len(), <span class="number">3</span>);
         assert_token(<span class="kw-2">&amp;</span>tokens[<span class="number">0</span>], <span class="number">0</span>, <span class="string">&quot;hel&quot;</span>, <span class="number">0</span>, <span class="number">3</span>);
         assert_token(<span class="kw-2">&amp;</span>tokens[<span class="number">1</span>], <span class="number">0</span>, <span class="string">&quot;ell&quot;</span>, <span class="number">1</span>, <span class="number">4</span>);
         assert_token(<span class="kw-2">&amp;</span>tokens[<span class="number">2</span>], <span class="number">0</span>, <span class="string">&quot;llo&quot;</span>, <span class="number">2</span>, <span class="number">5</span>);
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_ngram_tokenizer_2_5_prefix() {
         <span class="kw">let </span>tokens = test_helper(NgramTokenizer::prefix_only(<span class="number">2</span>, <span class="number">5</span>).token_stream(<span class="string">&quot;frankenstein&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;fr&quot;</span>, <span class="number">0</span>, <span class="number">2</span>);
         assert_token(<span class="kw-2">&amp;</span>tokens[<span class="number">1</span>], <span class="number">0</span>, <span class="string">&quot;fra&quot;</span>, <span class="number">0</span>, <span class="number">3</span>);
         assert_token(<span class="kw-2">&amp;</span>tokens[<span class="number">2</span>], <span class="number">0</span>, <span class="string">&quot;fran&quot;</span>, <span class="number">0</span>, <span class="number">4</span>);
         assert_token(<span class="kw-2">&amp;</span>tokens[<span class="number">3</span>], <span class="number">0</span>, <span class="string">&quot;frank&quot;</span>, <span class="number">0</span>, <span class="number">5</span>);
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_ngram_non_ascii_1_2() {
         <span class="kw">let </span>tokens = test_helper(NgramTokenizer::all_ngrams(<span class="number">1</span>, <span class="number">2</span>).token_stream(<span class="string">&quot;hεllo&quot;</span>));
         <span class="macro">assert_eq!</span>(tokens.len(), <span class="number">9</span>);
         assert_token(<span class="kw-2">&amp;</span>tokens[<span class="number">0</span>], <span class="number">0</span>, <span class="string">&quot;h&quot;</span>, <span class="number">0</span>, <span class="number">1</span>);
         assert_token(<span class="kw-2">&amp;</span>tokens[<span class="number">1</span>], <span class="number">0</span>, <span class="string">&quot;hε&quot;</span>, <span class="number">0</span>, <span class="number">3</span>);
         assert_token(<span class="kw-2">&amp;</span>tokens[<span class="number">2</span>], <span class="number">0</span>, <span class="string">&quot;ε&quot;</span>, <span class="number">1</span>, <span class="number">3</span>);
         assert_token(<span class="kw-2">&amp;</span>tokens[<span class="number">3</span>], <span class="number">0</span>, <span class="string">&quot;εl&quot;</span>, <span class="number">1</span>, <span class="number">4</span>);
         assert_token(<span class="kw-2">&amp;</span>tokens[<span class="number">4</span>], <span class="number">0</span>, <span class="string">&quot;l&quot;</span>, <span class="number">3</span>, <span class="number">4</span>);
         assert_token(<span class="kw-2">&amp;</span>tokens[<span class="number">5</span>], <span class="number">0</span>, <span class="string">&quot;ll&quot;</span>, <span class="number">3</span>, <span class="number">5</span>);
         assert_token(<span class="kw-2">&amp;</span>tokens[<span class="number">6</span>], <span class="number">0</span>, <span class="string">&quot;l&quot;</span>, <span class="number">4</span>, <span class="number">5</span>);
         assert_token(<span class="kw-2">&amp;</span>tokens[<span class="number">7</span>], <span class="number">0</span>, <span class="string">&quot;lo&quot;</span>, <span class="number">4</span>, <span class="number">6</span>);
         assert_token(<span class="kw-2">&amp;</span>tokens[<span class="number">8</span>], <span class="number">0</span>, <span class="string">&quot;o&quot;</span>, <span class="number">5</span>, <span class="number">6</span>);
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_ngram_non_ascii_2_5_prefix() {
         <span class="kw">let </span>tokens = test_helper(NgramTokenizer::prefix_only(<span class="number">2</span>, <span class="number">5</span>).token_stream(<span class="string">&quot;hεllo&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;hε&quot;</span>, <span class="number">0</span>, <span class="number">3</span>);
         assert_token(<span class="kw-2">&amp;</span>tokens[<span class="number">1</span>], <span class="number">0</span>, <span class="string">&quot;hεl&quot;</span>, <span class="number">0</span>, <span class="number">4</span>);
         assert_token(<span class="kw-2">&amp;</span>tokens[<span class="number">2</span>], <span class="number">0</span>, <span class="string">&quot;hεll&quot;</span>, <span class="number">0</span>, <span class="number">5</span>);
         assert_token(<span class="kw-2">&amp;</span>tokens[<span class="number">3</span>], <span class="number">0</span>, <span class="string">&quot;hεllo&quot;</span>, <span class="number">0</span>, <span class="number">6</span>);
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_ngram_empty() {
         <span class="kw">let </span>tokens = test_helper(NgramTokenizer::all_ngrams(<span class="number">1</span>, <span class="number">5</span>).token_stream(<span class="string">&quot;&quot;</span>));
         <span class="macro">assert!</span>(tokens.is_empty());
         <span class="kw">let </span>tokens = test_helper(NgramTokenizer::all_ngrams(<span class="number">2</span>, <span class="number">5</span>).token_stream(<span class="string">&quot;&quot;</span>));
         <span class="macro">assert!</span>(tokens.is_empty());
     }

     <span class="attribute">#[test]
     #[should_panic(expected = <span class="string">&quot;min_gram must be greater than 0&quot;</span>)]
     </span><span class="kw">fn </span>test_ngram_min_max_interval_empty() {
         test_helper(NgramTokenizer::all_ngrams(<span class="number">0</span>, <span class="number">2</span>).token_stream(<span class="string">&quot;hellossss&quot;</span>));
     }

     <span class="attribute">#[test]
     #[should_panic(expected = <span class="string">&quot;min_gram must not be greater than max_gram&quot;</span>)]
     </span><span class="kw">fn </span>test_invalid_interval_should_panic_if_smaller() {
         NgramTokenizer::all_ngrams(<span class="number">2</span>, <span class="number">1</span>);
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_stutterring_iterator_empty() {
         <span class="kw">let </span>rg: Vec&lt;usize&gt; = <span class="macro">vec!</span>[<span class="number">0</span>];
         <span class="kw">let </span><span class="kw-2">mut </span>it = StutteringIterator::new(rg.into_iter(), <span class="number">1</span>, <span class="number">2</span>);
         <span class="macro">assert_eq!</span>(it.next(), <span class="prelude-val">None</span>);
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_stutterring_iterator() {
         <span class="kw">let </span><span class="kw-2">mut </span>it = StutteringIterator::new(<span class="number">0</span>..<span class="number">10</span>, <span class="number">1</span>, <span class="number">2</span>);
         <span class="macro">assert_eq!</span>(it.next(), <span class="prelude-val">Some</span>((<span class="number">0</span>, <span class="number">1</span>)));
         <span class="macro">assert_eq!</span>(it.next(), <span class="prelude-val">Some</span>((<span class="number">0</span>, <span class="number">2</span>)));
         <span class="macro">assert_eq!</span>(it.next(), <span class="prelude-val">Some</span>((<span class="number">1</span>, <span class="number">2</span>)));
         <span class="macro">assert_eq!</span>(it.next(), <span class="prelude-val">Some</span>((<span class="number">1</span>, <span class="number">3</span>)));
         <span class="macro">assert_eq!</span>(it.next(), <span class="prelude-val">Some</span>((<span class="number">2</span>, <span class="number">3</span>)));
         <span class="macro">assert_eq!</span>(it.next(), <span class="prelude-val">Some</span>((<span class="number">2</span>, <span class="number">4</span>)));
         <span class="macro">assert_eq!</span>(it.next(), <span class="prelude-val">Some</span>((<span class="number">3</span>, <span class="number">4</span>)));
         <span class="macro">assert_eq!</span>(it.next(), <span class="prelude-val">Some</span>((<span class="number">3</span>, <span class="number">5</span>)));
         <span class="macro">assert_eq!</span>(it.next(), <span class="prelude-val">Some</span>((<span class="number">4</span>, <span class="number">5</span>)));
         <span class="macro">assert_eq!</span>(it.next(), <span class="prelude-val">Some</span>((<span class="number">4</span>, <span class="number">6</span>)));
         <span class="macro">assert_eq!</span>(it.next(), <span class="prelude-val">Some</span>((<span class="number">5</span>, <span class="number">6</span>)));
         <span class="macro">assert_eq!</span>(it.next(), <span class="prelude-val">Some</span>((<span class="number">5</span>, <span class="number">7</span>)));
         <span class="macro">assert_eq!</span>(it.next(), <span class="prelude-val">Some</span>((<span class="number">6</span>, <span class="number">7</span>)));
         <span class="macro">assert_eq!</span>(it.next(), <span class="prelude-val">Some</span>((<span class="number">6</span>, <span class="number">8</span>)));
         <span class="macro">assert_eq!</span>(it.next(), <span class="prelude-val">Some</span>((<span class="number">7</span>, <span class="number">8</span>)));
         <span class="macro">assert_eq!</span>(it.next(), <span class="prelude-val">Some</span>((<span class="number">7</span>, <span class="number">9</span>)));
         <span class="macro">assert_eq!</span>(it.next(), <span class="prelude-val">Some</span>((<span class="number">8</span>, <span class="number">9</span>)));
         <span class="macro">assert_eq!</span>(it.next(), <span class="prelude-val">None</span>);
     }
 }
 </code></pre></div>
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