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</pre><pre class="rust ">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">hash</span>::{<span class="ident">Hasher</span>, <span class="ident">Hash</span>};
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">borrow</span>::<span class="ident">Cow</span>;
<span class="kw">use</span> <span class="ident">std</span>::{<span class="ident">cmp</span>, <span class="ident">fmt</span>};
<span class="doccomment">/// Specifier for the specific kind of cp437.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Dialects are instances of this type, aggregating data necessary to perform conversions.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Cp437Dialect</span> {
<span class="ident">cp437_to_unicode</span>: [<span class="ident">char</span>; <span class="number">256</span>],
<span class="ident">overlap_unicode</span>: <span class="kw">fn</span>(<span class="ident">unicode</span>: <span class="ident">char</span>) <span class="op">-></span> <span class="ident">bool</span>,
<span class="ident">overlap_cp437</span>: <span class="kw">fn</span>(<span class="ident">cp437</span>: <span class="ident">u8</span>) <span class="op">-></span> <span class="ident">bool</span>,
<span class="ident">encode</span>: <span class="kw">fn</span>(<span class="ident">unicode</span>: <span class="ident">char</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span>,
<span class="doccomment">/// cp437, from, to</span>
<span class="ident">remaps</span>: <span class="ident">Cow</span><span class="op"><</span><span class="lifetime">'static</span>, [(<span class="ident">u8</span>, <span class="ident">char</span>, <span class="ident">char</span>)]<span class="op">></span>,
}
<span class="kw">impl</span> <span class="ident">Cp437Dialect</span> {
<span class="doccomment">/// Check, whether the specified Unicode codepoint overlaps with a cp437 one.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">overlap_unicode</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">unicode</span>: <span class="ident">char</span>) <span class="op">-></span> <span class="ident">bool</span> {
(<span class="self">self</span>.<span class="ident">overlap_unicode</span>)(<span class="ident">unicode</span>) <span class="op">&&</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">remaps</span>.<span class="ident">iter</span>().<span class="ident">rev</span>().<span class="ident">find</span>(<span class="op">|</span><span class="op">&&</span>(<span class="kw">_</span>, <span class="kw">_</span>, <span class="ident">to</span>)<span class="op">|</span> <span class="ident">to</span> <span class="op">==</span> <span class="ident">unicode</span>).<span class="ident">is_some</span>()
}
<span class="doccomment">/// Check, whether the specified cp437 codepoint overlaps with a Unicode one.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">overlap_cp437</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">cp437</span>: <span class="ident">u8</span>) <span class="op">-></span> <span class="ident">bool</span> {
(<span class="self">self</span>.<span class="ident">overlap_cp437</span>)(<span class="ident">cp437</span>) <span class="op">&&</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">remaps</span>.<span class="ident">iter</span>().<span class="ident">rev</span>().<span class="ident">find</span>(<span class="op">|</span><span class="op">&&</span>(<span class="ident">whom</span>, <span class="kw">_</span>, <span class="kw">_</span>)<span class="op">|</span> <span class="ident">whom</span> <span class="op">==</span> <span class="ident">cp437</span>).<span class="ident">is_some</span>()
}
<span class="doccomment">/// Decode a single cp437 codepoint into a Unicode one.</span>
<span class="attribute">#[<span class="ident">inline</span>(<span class="ident">always</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">decode</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">cp437</span>: <span class="ident">u8</span>) <span class="op">-></span> <span class="ident">char</span> {
<span class="self">self</span>.<span class="ident">cp437_to_unicode</span>[<span class="ident">cp437</span> <span class="kw">as</span> <span class="ident">usize</span>]
}
<span class="doccomment">/// Try to encode a single Unicode codepoint as a cp437 one.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">encode</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">unicode</span>: <span class="ident">char</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">remaps</span>.<span class="ident">iter</span>().<span class="ident">rev</span>().<span class="ident">find</span>(<span class="op">|</span><span class="op">&&</span>(<span class="kw">_</span>, <span class="kw">_</span>, <span class="ident">to</span>)<span class="op">|</span> <span class="ident">to</span> <span class="op">==</span> <span class="ident">unicode</span>).<span class="ident">map</span>(<span class="op">|</span><span class="kw-2">&</span>(<span class="ident">whom</span>, <span class="kw">_</span>, <span class="kw">_</span>)<span class="op">|</span> <span class="ident">whom</span>).<span class="ident">or_else</span>(<span class="op">||</span> (<span class="self">self</span>.<span class="ident">encode</span>)(<span class="ident">unicode</span>))
}
<span class="doccomment">/// Map the specified cp437 codepoint mapped to the specified unicode character instead.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Remap `√` to `✓`:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// # use codepage_437::CP437_WINGDINGS;</span>
<span class="doccomment">/// let square_root_or_checkmark = CP437_WINGDINGS.encode('√').unwrap();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut mapping = CP437_WINGDINGS.clone();</span>
<span class="doccomment">/// mapping.remap(square_root_or_checkmark, '✓');</span>
<span class="doccomment">/// assert_eq!(mapping.decode(square_root_or_checkmark), '✓');</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">remap</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">cp437</span>: <span class="ident">u8</span>, <span class="ident">unicode</span>: <span class="ident">char</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Cp437Dialect</span> {
<span class="self">self</span>.<span class="ident">remaps</span>.<span class="ident">to_mut</span>().<span class="ident">push</span>((<span class="ident">cp437</span>, <span class="self">self</span>.<span class="ident">cp437_to_unicode</span>[<span class="ident">cp437</span> <span class="kw">as</span> <span class="ident">usize</span>], <span class="ident">unicode</span>));
<span class="self">self</span>.<span class="ident">cp437_to_unicode</span>[<span class="ident">cp437</span> <span class="kw">as</span> <span class="ident">usize</span>] <span class="op">=</span> <span class="ident">unicode</span>;
<span class="self">self</span>
}
}
<span class="comment">// These traits are implemented manually, because rustc is at a loss for big arrays (like the 256 one).</span>
<span class="kw">impl</span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">Cp437Dialect</span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="ident">f</span>.<span class="ident">debug_struct</span>(<span class="string">"Cp437Dialect"</span>)
.<span class="ident">field</span>(<span class="string">"cp437_to_unicode"</span>, <span class="op">&&</span><span class="self">self</span>.<span class="ident">cp437_to_unicode</span>[..])
.<span class="ident">field</span>(<span class="string">"overlap_unicode"</span>, <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">overlap_unicode</span>)
.<span class="ident">field</span>(<span class="string">"overlap_cp437"</span>, <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">overlap_cp437</span>)
.<span class="ident">field</span>(<span class="string">"encode"</span>, <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">encode</span>)
.<span class="ident">field</span>(<span class="string">"remaps"</span>, <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">remaps</span>)
.<span class="ident">finish</span>()
}
}
<span class="kw">impl</span> <span class="ident">Hash</span> <span class="kw">for</span> <span class="ident">Cp437Dialect</span> {
<span class="kw">fn</span> <span class="ident">hash</span><span class="op"><</span><span class="ident">H</span>: <span class="ident">Hasher</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">state</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">H</span>) {
<span class="self">self</span>.<span class="ident">cp437_to_unicode</span>[..].<span class="ident">hash</span>(<span class="ident">state</span>);
<span class="self">self</span>.<span class="ident">overlap_unicode</span>.<span class="ident">hash</span>(<span class="ident">state</span>);
<span class="self">self</span>.<span class="ident">overlap_cp437</span>.<span class="ident">hash</span>(<span class="ident">state</span>);
<span class="self">self</span>.<span class="ident">encode</span>.<span class="ident">hash</span>(<span class="ident">state</span>);
<span class="self">self</span>.<span class="ident">remaps</span>.<span class="ident">hash</span>(<span class="ident">state</span>);
}
}
<span class="kw">impl</span> <span class="ident">cmp</span>::<span class="ident">Eq</span> <span class="kw">for</span> <span class="ident">Cp437Dialect</span> {}
<span class="kw">impl</span> <span class="ident">cmp</span>::<span class="ident">PartialEq</span> <span class="kw">for</span> <span class="ident">Cp437Dialect</span> {
<span class="kw">fn</span> <span class="ident">eq</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="ident">Cp437Dialect</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="self">self</span>.<span class="ident">cp437_to_unicode</span>[..] <span class="op">==</span> <span class="ident">other</span>.<span class="ident">cp437_to_unicode</span>[..] <span class="op">&&</span> <span class="comment">// align</span>
<span class="self">self</span>.<span class="ident">overlap_unicode</span> <span class="op">==</span> <span class="ident">other</span>.<span class="ident">overlap_unicode</span> <span class="op">&&</span> <span class="comment">// align</span>
<span class="self">self</span>.<span class="ident">overlap_cp437</span> <span class="op">==</span> <span class="ident">other</span>.<span class="ident">overlap_cp437</span> <span class="op">&&</span> <span class="comment">// align</span>
<span class="self">self</span>.<span class="ident">encode</span> <span class="op">==</span> <span class="ident">other</span>.<span class="ident">encode</span> <span class="op">&&</span> <span class="comment">// align</span>
<span class="self">self</span>.<span class="ident">remaps</span> <span class="op">==</span> <span class="ident">other</span>.<span class="ident">remaps</span>
}
}
<span class="kw">impl</span> <span class="ident">cmp</span>::<span class="ident">Ord</span> <span class="kw">for</span> <span class="ident">Cp437Dialect</span> {
<span class="kw">fn</span> <span class="ident">cmp</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="ident">Cp437Dialect</span>) <span class="op">-></span> <span class="ident">cmp</span>::<span class="ident">Ordering</span> {
<span class="self">self</span>.<span class="ident">cp437_to_unicode</span>[..]
.<span class="ident">cmp</span>(<span class="kw-2">&</span><span class="ident">other</span>.<span class="ident">cp437_to_unicode</span>[..])
.<span class="ident">then</span>(<span class="self">self</span>.<span class="ident">overlap_unicode</span>.<span class="ident">cmp</span>(<span class="kw-2">&</span><span class="ident">other</span>.<span class="ident">overlap_unicode</span>))
.<span class="ident">then</span>(<span class="self">self</span>.<span class="ident">overlap_cp437</span>.<span class="ident">cmp</span>(<span class="kw-2">&</span><span class="ident">other</span>.<span class="ident">overlap_cp437</span>))
.<span class="ident">then</span>(<span class="self">self</span>.<span class="ident">encode</span>.<span class="ident">cmp</span>(<span class="kw-2">&</span><span class="ident">other</span>.<span class="ident">encode</span>))
.<span class="ident">then</span>(<span class="self">self</span>.<span class="ident">remaps</span>.<span class="ident">cmp</span>(<span class="kw-2">&</span><span class="ident">other</span>.<span class="ident">remaps</span>))
}
}
<span class="kw">impl</span> <span class="ident">cmp</span>::<span class="ident">PartialOrd</span> <span class="kw">for</span> <span class="ident">Cp437Dialect</span> {
<span class="kw">fn</span> <span class="ident">partial_cmp</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="ident">Cp437Dialect</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">cmp</span>::<span class="ident">Ordering</span><span class="op">></span> {
<span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="ident">cmp</span>(<span class="ident">other</span>))
}
}
<span class="macro">include</span><span class="macro">!</span>(<span class="macro">concat</span><span class="macro">!</span>(<span class="macro">env</span><span class="macro">!</span>(<span class="string">"OUT_DIR"</span>), <span class="string">"/dialects.rs"</span>));
</pre>
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