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</pre><pre class="rust">
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">PartialEq</span>)]</span>
<span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">Token</span> {
<span class="ident">Eof</span>,
<span class="ident">Def</span>,
<span class="ident">Extern</span>,
<span class="ident">Identifier</span>(<span class="ident">String</span>),
<span class="ident">Number</span>(<span class="ident">f64</span>),
<span class="ident">Char</span>(<span class="ident">char</span>),
}
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Lexer</span><span class="op"><</span><span class="ident">I</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">I</span>: <span class="ident">Iterator</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> <span class="ident">char</span><span class="op">></span>,
{
<span class="ident">input</span>: <span class="ident">I</span>,
<span class="ident">last_char</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">char</span><span class="op">></span>,
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">I</span><span class="op">></span> <span class="ident">Lexer</span><span class="op"><</span><span class="ident">I</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">I</span>: <span class="ident">Iterator</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> <span class="ident">char</span><span class="op">></span>,
{
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="kw-2">mut</span> <span class="ident">input</span>: <span class="ident">I</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Lexer</span><span class="op"><</span><span class="ident">I</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">last_char</span> <span class="op">=</span> <span class="ident">input</span>.<span class="ident">next</span>();
<span class="ident">Lexer</span> { <span class="ident">input</span>, <span class="ident">last_char</span> }
}
<span class="kw">fn</span> <span class="ident">step</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">char</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">last_char</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">input</span>.<span class="ident">next</span>();
<span class="self">self</span>.<span class="ident">last_char</span>
}
<span class="doccomment">/// Lex and return the next token.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Implement `int gettok();` from the tutorial.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">gettok</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Token</span> {
<span class="comment">// Eat up whitespaces.</span>
<span class="kw">while</span> <span class="macro">matches!</span>(<span class="self">self</span>.<span class="ident">last_char</span>, <span class="prelude-val">Some</span>(<span class="ident">c</span>) <span class="kw">if</span> <span class="ident">c</span>.<span class="ident">is_ascii_whitespace</span>()) {
<span class="self">self</span>.<span class="ident">step</span>();
}
<span class="comment">// Unpack last char or return EOF.</span>
<span class="kw">let</span> <span class="ident">last_char</span> <span class="op">=</span> <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">c</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">last_char</span> {
<span class="ident">c</span>
} <span class="kw">else</span> {
<span class="kw">return</span> <span class="ident">Token::Eof</span>;
};
<span class="comment">// Identifier: [a-zA-Z][a-zA-Z0-9]*</span>
<span class="kw">if</span> <span class="ident">last_char</span>.<span class="ident">is_ascii_alphabetic</span>() {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">ident</span> <span class="op">=</span> <span class="ident">String::new</span>();
<span class="ident">ident</span>.<span class="ident">push</span>(<span class="ident">last_char</span>);
<span class="kw">while</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">c</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">step</span>() {
<span class="kw">if</span> <span class="ident">c</span>.<span class="ident">is_ascii_alphanumeric</span>() {
<span class="ident">ident</span>.<span class="ident">push</span>(<span class="ident">c</span>)
} <span class="kw">else</span> {
<span class="kw">break</span>;
}
}
<span class="kw">match</span> <span class="ident">ident</span>.<span class="ident">as_ref</span>() {
<span class="string">"def"</span> <span class="op">=</span><span class="op">></span> <span class="kw">return</span> <span class="ident">Token::Def</span>,
<span class="string">"extern"</span> <span class="op">=</span><span class="op">></span> <span class="kw">return</span> <span class="ident">Token::Extern</span>,
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> {}
}
<span class="kw">return</span> <span class="ident">Token::Identifier</span>(<span class="ident">ident</span>);
}
<span class="comment">// Number: [0-9.]+</span>
<span class="kw">if</span> <span class="ident">last_char</span>.<span class="ident">is_ascii_digit</span>() <span class="op">|</span><span class="op">|</span> <span class="ident">last_char</span> <span class="op">=</span><span class="op">=</span> <span class="string">'.'</span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">num</span> <span class="op">=</span> <span class="ident">String::new</span>();
<span class="ident">num</span>.<span class="ident">push</span>(<span class="ident">last_char</span>);
<span class="kw">while</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">c</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">step</span>() {
<span class="kw">if</span> <span class="ident">c</span>.<span class="ident">is_ascii_digit</span>() <span class="op">|</span><span class="op">|</span> <span class="ident">c</span> <span class="op">=</span><span class="op">=</span> <span class="string">'.'</span> {
<span class="ident">num</span>.<span class="ident">push</span>(<span class="ident">c</span>)
} <span class="kw">else</span> {
<span class="kw">break</span>;
}
}
<span class="kw">let</span> <span class="ident">num</span>: <span class="ident">f64</span> <span class="op">=</span> <span class="ident">num</span>.<span class="ident">parse</span>().<span class="ident">unwrap_or_default</span>();
<span class="kw">return</span> <span class="ident">Token::Number</span>(<span class="ident">num</span>);
}
<span class="comment">// Eat up comment.</span>
<span class="kw">if</span> <span class="ident">last_char</span> <span class="op">=</span><span class="op">=</span> <span class="string">'#'</span> {
<span class="kw">loop</span> {
<span class="kw">match</span> <span class="self">self</span>.<span class="ident">step</span>() {
<span class="prelude-val">Some</span>(<span class="ident">c</span>) <span class="kw">if</span> <span class="ident">c</span> <span class="op">=</span><span class="op">=</span> <span class="string">'\r'</span> <span class="op">|</span><span class="op">|</span> <span class="ident">c</span> <span class="op">=</span><span class="op">=</span> <span class="string">'\n'</span> <span class="op">=</span><span class="op">></span> <span class="kw">return</span> <span class="self">self</span>.<span class="ident">gettok</span>(),
<span class="prelude-val">None</span> <span class="op">=</span><span class="op">></span> <span class="kw">return</span> <span class="ident">Token::Eof</span>,
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> { <span class="comment">/* consume comment */</span> }
}
}
}
<span class="comment">// Advance last char and return currently last char.</span>
<span class="self">self</span>.<span class="ident">step</span>();
<span class="ident">Token::Char</span>(<span class="ident">last_char</span>)
}
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span>
<span class="kw">mod</span> <span class="ident">test</span> {
<span class="kw">use</span> <span class="kw">super</span>::{<span class="ident">Lexer</span>, <span class="ident">Token</span>};
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_identifier</span>() {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">lex</span> <span class="op">=</span> <span class="ident">Lexer::new</span>(<span class="string">"a b c"</span>.<span class="ident">chars</span>());
<span class="macro">assert_eq!</span>(<span class="ident">Token::Identifier</span>(<span class="string">"a"</span>.<span class="ident">into</span>()), <span class="ident">lex</span>.<span class="ident">gettok</span>());
<span class="macro">assert_eq!</span>(<span class="ident">Token::Identifier</span>(<span class="string">"b"</span>.<span class="ident">into</span>()), <span class="ident">lex</span>.<span class="ident">gettok</span>());
<span class="macro">assert_eq!</span>(<span class="ident">Token::Identifier</span>(<span class="string">"c"</span>.<span class="ident">into</span>()), <span class="ident">lex</span>.<span class="ident">gettok</span>());
<span class="macro">assert_eq!</span>(<span class="ident">Token::Eof</span>, <span class="ident">lex</span>.<span class="ident">gettok</span>());
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_keyword</span>() {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">lex</span> <span class="op">=</span> <span class="ident">Lexer::new</span>(<span class="string">"def extern"</span>.<span class="ident">chars</span>());
<span class="macro">assert_eq!</span>(<span class="ident">Token::Def</span>, <span class="ident">lex</span>.<span class="ident">gettok</span>());
<span class="macro">assert_eq!</span>(<span class="ident">Token::Extern</span>, <span class="ident">lex</span>.<span class="ident">gettok</span>());
<span class="macro">assert_eq!</span>(<span class="ident">Token::Eof</span>, <span class="ident">lex</span>.<span class="ident">gettok</span>());
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_number</span>() {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">lex</span> <span class="op">=</span> <span class="ident">Lexer::new</span>(<span class="string">"12.34"</span>.<span class="ident">chars</span>());
<span class="macro">assert_eq!</span>(<span class="ident">Token::Number</span>(<span class="number">12.34f64</span>), <span class="ident">lex</span>.<span class="ident">gettok</span>());
<span class="macro">assert_eq!</span>(<span class="ident">Token::Eof</span>, <span class="ident">lex</span>.<span class="ident">gettok</span>());
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">lex</span> <span class="op">=</span> <span class="ident">Lexer::new</span>(<span class="string">" 1.0 2.0 3.0"</span>.<span class="ident">chars</span>());
<span class="macro">assert_eq!</span>(<span class="ident">Token::Number</span>(<span class="number">1.0f64</span>), <span class="ident">lex</span>.<span class="ident">gettok</span>());
<span class="macro">assert_eq!</span>(<span class="ident">Token::Number</span>(<span class="number">2.0f64</span>), <span class="ident">lex</span>.<span class="ident">gettok</span>());
<span class="macro">assert_eq!</span>(<span class="ident">Token::Number</span>(<span class="number">3.0f64</span>), <span class="ident">lex</span>.<span class="ident">gettok</span>());
<span class="macro">assert_eq!</span>(<span class="ident">Token::Eof</span>, <span class="ident">lex</span>.<span class="ident">gettok</span>());
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">lex</span> <span class="op">=</span> <span class="ident">Lexer::new</span>(<span class="string">"12.34.56"</span>.<span class="ident">chars</span>());
<span class="macro">assert_eq!</span>(<span class="ident">Token::Number</span>(<span class="number">0f64</span>), <span class="ident">lex</span>.<span class="ident">gettok</span>());
<span class="macro">assert_eq!</span>(<span class="ident">Token::Eof</span>, <span class="ident">lex</span>.<span class="ident">gettok</span>());
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_comment</span>() {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">lex</span> <span class="op">=</span> <span class="ident">Lexer::new</span>(<span class="string">"# some comment"</span>.<span class="ident">chars</span>());
<span class="macro">assert_eq!</span>(<span class="ident">Token::Eof</span>, <span class="ident">lex</span>.<span class="ident">gettok</span>());
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">lex</span> <span class="op">=</span> <span class="ident">Lexer::new</span>(<span class="string">"abc # some comment \n xyz"</span>.<span class="ident">chars</span>());
<span class="macro">assert_eq!</span>(<span class="ident">Token::Identifier</span>(<span class="string">"abc"</span>.<span class="ident">into</span>()), <span class="ident">lex</span>.<span class="ident">gettok</span>());
<span class="macro">assert_eq!</span>(<span class="ident">Token::Identifier</span>(<span class="string">"xyz"</span>.<span class="ident">into</span>()), <span class="ident">lex</span>.<span class="ident">gettok</span>());
<span class="macro">assert_eq!</span>(<span class="ident">Token::Eof</span>, <span class="ident">lex</span>.<span class="ident">gettok</span>());
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_chars</span>() {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">lex</span> <span class="op">=</span> <span class="ident">Lexer::new</span>(<span class="string">"a+b-c"</span>.<span class="ident">chars</span>());
<span class="macro">assert_eq!</span>(<span class="ident">Token::Identifier</span>(<span class="string">"a"</span>.<span class="ident">into</span>()), <span class="ident">lex</span>.<span class="ident">gettok</span>());
<span class="macro">assert_eq!</span>(<span class="ident">Token::Char</span>(<span class="string">'+'</span>), <span class="ident">lex</span>.<span class="ident">gettok</span>());
<span class="macro">assert_eq!</span>(<span class="ident">Token::Identifier</span>(<span class="string">"b"</span>.<span class="ident">into</span>()), <span class="ident">lex</span>.<span class="ident">gettok</span>());
<span class="macro">assert_eq!</span>(<span class="ident">Token::Char</span>(<span class="string">'-'</span>), <span class="ident">lex</span>.<span class="ident">gettok</span>());
<span class="macro">assert_eq!</span>(<span class="ident">Token::Identifier</span>(<span class="string">"c"</span>.<span class="ident">into</span>()), <span class="ident">lex</span>.<span class="ident">gettok</span>());
<span class="macro">assert_eq!</span>(<span class="ident">Token::Eof</span>, <span class="ident">lex</span>.<span class="ident">gettok</span>());
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_whitespaces</span>() {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">lex</span> <span class="op">=</span> <span class="ident">Lexer::new</span>(<span class="string">" +a b c! "</span>.<span class="ident">chars</span>());
<span class="macro">assert_eq!</span>(<span class="ident">Token::Char</span>(<span class="string">'+'</span>), <span class="ident">lex</span>.<span class="ident">gettok</span>());
<span class="macro">assert_eq!</span>(<span class="ident">Token::Identifier</span>(<span class="string">"a"</span>.<span class="ident">into</span>()), <span class="ident">lex</span>.<span class="ident">gettok</span>());
<span class="macro">assert_eq!</span>(<span class="ident">Token::Identifier</span>(<span class="string">"b"</span>.<span class="ident">into</span>()), <span class="ident">lex</span>.<span class="ident">gettok</span>());
<span class="macro">assert_eq!</span>(<span class="ident">Token::Identifier</span>(<span class="string">"c"</span>.<span class="ident">into</span>()), <span class="ident">lex</span>.<span class="ident">gettok</span>());
<span class="macro">assert_eq!</span>(<span class="ident">Token::Char</span>(<span class="string">'!'</span>), <span class="ident">lex</span>.<span class="ident">gettok</span>());
<span class="macro">assert_eq!</span>(<span class="ident">Token::Eof</span>, <span class="ident">lex</span>.<span class="ident">gettok</span>());
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">lex</span> <span class="op">=</span> <span class="ident">Lexer::new</span>(<span class="string">"\n a \n\r b \r \n c \r\r \n "</span>.<span class="ident">chars</span>());
<span class="macro">assert_eq!</span>(<span class="ident">Token::Identifier</span>(<span class="string">"a"</span>.<span class="ident">into</span>()), <span class="ident">lex</span>.<span class="ident">gettok</span>());
<span class="macro">assert_eq!</span>(<span class="ident">Token::Identifier</span>(<span class="string">"b"</span>.<span class="ident">into</span>()), <span class="ident">lex</span>.<span class="ident">gettok</span>());
<span class="macro">assert_eq!</span>(<span class="ident">Token::Identifier</span>(<span class="string">"c"</span>.<span class="ident">into</span>()), <span class="ident">lex</span>.<span class="ident">gettok</span>());
<span class="macro">assert_eq!</span>(<span class="ident">Token::Eof</span>, <span class="ident">lex</span>.<span class="ident">gettok</span>());
}
}
</pre></div>
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