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</pre><pre class='rust '>
<span class='kw'>use</span> <span class='kw'>super</span>::<span class='ident'>FromLiteral</span>;
<span class='kw'>use</span> <span class='kw'>super</span>::<span class='ident'>syn</span>::{
<span class='ident'>Attribute</span>,
<span class='ident'>MetaItem</span>,
<span class='ident'>NestedMetaItem</span>
};
<span class='kw'>use</span> <span class='kw'>super</span>::<span class='ident'>Lit</span>;
<span class='macro'>macro_rules</span><span class='macro'>!</span> <span class='ident'>is_thing</span> {
(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>name</span>:<span class='ident'>ident</span>, <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>ma</span>: <span class='ident'>pat</span>) <span class='op'>=></span> {
<span class='attribute'>#[<span class='ident'>inline</span>(<span class='ident'>always</span>)]</span>
<span class='attribute'>#[<span class='ident'>allow</span>(<span class='ident'>dead_code</span>)]</span>
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>name</span>(<span class='kw-2'>&</span><span class='self'>self</span>) <span class='op'>-></span> <span class='ident'>bool</span> {
<span class='kw'>match</span> <span class='self'>self</span> {
<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>ma</span> <span class='op'>=></span> <span class='bool-val'>true</span>,
_ <span class='op'>=></span> <span class='bool-val'>false</span>
}
}
}
}
<span class='doccomment'>/// For arguments within `#[derive ...]` tag</span>
<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Clone</span>,<span class='ident'>Debug</span>)]</span>
<span class='kw'>pub</span> <span class='kw'>enum</span> <span class='ident'>HashTag</span> {
<span class='doccomment'>///The name of a MetaItem.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>///`#[test]` will return `MetaItem::Word("Test")`</span>
<span class='ident'>Word</span>(<span class='ident'>String</span>),
<span class='doccomment'>/// A list of values</span>
<span class='doccomment'>///</span>
<span class='doccomment'>///`#[derive(Copy,Clone)]` will return</span>
<span class='doccomment'>///`MetaItem::List("derive",vec![Box::new(MetaItem::Word("Copy")),Box::new(MetaItem::Word("Clone"))])`</span>
<span class='ident'>List</span>(<span class='ident'>String</span>,<span class='ident'>Vec</span><span class='op'><</span><span class='ident'>Box</span><span class='op'><</span><span class='ident'>HashTag</span><span class='op'>>></span>),
<span class='doccomment'>/// An assigned value</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// `#[feature = "thing"]` will return `MetaItem::NameValue("feature", Literal::Str)`</span>
<span class='ident'>NameValue</span>(<span class='ident'>String</span>,<span class='ident'>Lit</span>),
<span class='doccomment'>/// A literal</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// This isn't a _first level_ item. It can be encountered within</span>
<span class='doccomment'>/// `MetaItem::List(_, vec![])` part. It is included to prevent</span>
<span class='doccomment'>/// defining a whole extra type like `syn` does.</span>
<span class='ident'>Literal</span>(<span class='ident'>Lit</span>),
}
<span class='doccomment'>/// Take care of Nested Items</span>
<span class='kw'>fn</span> <span class='ident'>mapper</span>( <span class='ident'>x</span>: <span class='kw-2'>&</span><span class='ident'>NestedMetaItem</span>) <span class='op'>-></span> <span class='ident'>Box</span><span class='op'><</span><span class='ident'>HashTag</span><span class='op'>></span> {
<span class='kw'>let</span> <span class='ident'>tag</span> <span class='op'>=</span> <span class='kw'>match</span> <span class='ident'>x</span> {
<span class='kw-2'>&</span><span class='ident'>NestedMetaItem</span>::<span class='ident'>Literal</span>(<span class='kw-2'>ref</span> <span class='ident'>x</span>) <span class='op'>=></span> <span class='ident'>HashTag</span>::<span class='ident'>Literal</span>(<span class='ident'>x</span>.<span class='ident'>clone</span>()),
<span class='kw-2'>&</span><span class='ident'>NestedMetaItem</span>::<span class='ident'>MetaItem</span>(<span class='kw-2'>ref</span> <span class='ident'>x</span>) <span class='op'>=></span> <span class='ident'>HashTag</span>::<span class='ident'>new</span>(<span class='ident'>x</span>),
};
<span class='ident'>Box</span>::<span class='ident'>new</span>(<span class='ident'>tag</span>)
}
<span class='kw'>impl</span> <span class='ident'>HashTag</span> {
<span class='doccomment'>/// Build a hashtag from a metatime</span>
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>new</span>(<span class='ident'>x</span>: <span class='kw-2'>&</span><span class='ident'>MetaItem</span>) <span class='op'>-></span> <span class='ident'>HashTag</span> {
<span class='kw'>match</span> <span class='ident'>x</span> {
<span class='kw-2'>&</span><span class='ident'>MetaItem</span>::<span class='ident'>Word</span>(<span class='kw-2'>ref</span> <span class='ident'>i</span>) <span class='op'>=></span> <span class='ident'>HashTag</span>::<span class='ident'>Word</span>(<span class='ident'>i</span>.<span class='ident'>to_string</span>()),
<span class='kw-2'>&</span><span class='ident'>MetaItem</span>::<span class='ident'>List</span>(<span class='kw-2'>ref</span> <span class='ident'>i</span>,<span class='kw-2'>ref</span> <span class='ident'>arr</span>) <span class='op'>=></span> {
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>v</span> <span class='op'>=</span> <span class='ident'>Vec</span>::<span class='ident'>with_capacity</span>(<span class='ident'>arr</span>.<span class='ident'>len</span>());
<span class='kw'>for</span> <span class='ident'>item</span> <span class='kw'>in</span> <span class='ident'>arr</span> {
<span class='ident'>v</span>.<span class='ident'>push</span>(<span class='ident'>mapper</span>(<span class='kw-2'>&</span><span class='ident'>item</span>));
}
<span class='ident'>HashTag</span>::<span class='ident'>List</span>(<span class='ident'>i</span>.<span class='ident'>to_string</span>(), <span class='ident'>v</span>)
},
<span class='kw-2'>&</span><span class='ident'>MetaItem</span>::<span class='ident'>NameValue</span>(<span class='kw-2'>ref</span> <span class='ident'>i</span>, <span class='kw-2'>ref</span> <span class='ident'>lit</span>) <span class='op'>=></span> <span class='ident'>HashTag</span>::<span class='ident'>NameValue</span>(<span class='ident'>i</span>.<span class='ident'>to_string</span>(), <span class='ident'>lit</span>.<span class='ident'>clone</span>())
}
}
<span class='doccomment'>/// Borrow Attribute value and parse</span>
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>complete</span>(<span class='ident'>x</span>: <span class='kw-2'>&</span>[<span class='ident'>Attribute</span>]) <span class='op'>-></span> <span class='ident'>Vec</span><span class='op'><</span><span class='ident'>HashTag</span><span class='op'>></span> {
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>v</span> <span class='op'>=</span> <span class='ident'>Vec</span>::<span class='ident'>with_capacity</span>(<span class='ident'>x</span>.<span class='ident'>len</span>());
<span class='kw'>for</span> <span class='ident'>item</span> <span class='kw'>in</span> <span class='ident'>x</span> {
<span class='ident'>v</span>.<span class='ident'>push</span>(<span class='ident'>HashTag</span>::<span class='ident'>new</span>(<span class='kw-2'>&</span><span class='ident'>item</span>.<span class='ident'>value</span>));
}
<span class='ident'>v</span>
}
<span class='macro'>is_thing</span><span class='macro'>!</span>(<span class='ident'>is_word</span>,<span class='kw-2'>&</span><span class='ident'>HashTag</span>::<span class='ident'>Word</span>(_));
<span class='macro'>is_thing</span><span class='macro'>!</span>(<span class='ident'>is_list</span>,<span class='kw-2'>&</span><span class='ident'>HashTag</span>::<span class='ident'>List</span>(_,_));
<span class='macro'>is_thing</span><span class='macro'>!</span>(<span class='ident'>is_name_value</span>,<span class='kw-2'>&</span><span class='ident'>HashTag</span>::<span class='ident'>NameValue</span>(_,_));
<span class='macro'>is_thing</span><span class='macro'>!</span>(<span class='ident'>is_literal</span>,<span class='kw-2'>&</span><span class='ident'>HashTag</span>::<span class='ident'>Word</span>(_));
<span class='doccomment'>/// Returns the name of the `#[...]` value</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// The `literal` exists so this can technically fail</span>
<span class='doccomment'>/// to return some</span>
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>get_name</span><span class='op'><</span><span class='lifetime'>'a</span><span class='op'>></span>(<span class='kw-2'>&</span><span class='lifetime'>'a</span> <span class='self'>self</span>) <span class='op'>-></span> <span class='prelude-ty'>Option</span><span class='op'><</span><span class='kw-2'>&</span><span class='lifetime'>'a</span> <span class='ident'>str</span><span class='op'>></span> {
<span class='kw'>match</span> <span class='self'>self</span> {
<span class='kw-2'>&</span><span class='ident'>HashTag</span>::<span class='ident'>Word</span>(<span class='kw-2'>ref</span> <span class='ident'>w</span>) <span class='op'>|</span>
<span class='kw-2'>&</span><span class='ident'>HashTag</span>::<span class='ident'>List</span>(<span class='kw-2'>ref</span> <span class='ident'>w</span>, _) <span class='op'>|</span>
<span class='kw-2'>&</span><span class='ident'>HashTag</span>::<span class='ident'>NameValue</span>(<span class='kw-2'>ref</span> <span class='ident'>w</span>, _) <span class='op'>=></span> <span class='prelude-val'>Some</span>(<span class='ident'>w</span>),
_ <span class='op'>=></span> <span class='prelude-val'>None</span>
}
}
<span class='doccomment'>/// Get Assignment</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// When `#[hashtag = value]` is used</span>
<span class='doccomment'>/// this function will return the `value`</span>
<span class='doccomment'>/// half</span>
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>get_name_value</span><span class='op'><</span><span class='lifetime'>'a</span><span class='op'>></span>(<span class='kw-2'>&</span><span class='lifetime'>'a</span> <span class='self'>self</span>) <span class='op'>-></span> <span class='prelude-ty'>Option</span><span class='op'><</span><span class='kw-2'>&</span><span class='lifetime'>'a</span> <span class='ident'>Lit</span><span class='op'>></span> {
<span class='kw'>match</span> <span class='self'>self</span> {
<span class='kw-2'>&</span><span class='ident'>HashTag</span>::<span class='ident'>NameValue</span>(_, <span class='kw-2'>ref</span> <span class='ident'>l</span>) <span class='op'>=></span> <span class='prelude-val'>Some</span>(<span class='ident'>l</span>),
_ <span class='op'>=></span> <span class='prelude-val'>None</span>
}
}
<span class='doccomment'>/// Get List</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// Fetches the internal list if a hashtag</span>
<span class='doccomment'>/// like `#[derive(Clone,Copy)]` Which will</span>
<span class='doccomment'>/// return an array of the `[Clone,Copy]`</span>
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>get_arg_list</span><span class='op'><</span><span class='lifetime'>'a</span><span class='op'>></span>(<span class='kw-2'>&</span><span class='lifetime'>'a</span> <span class='self'>self</span>) <span class='op'>-></span> <span class='prelude-ty'>Option</span><span class='op'><</span><span class='kw-2'>&</span><span class='lifetime'>'a</span> [<span class='ident'>Box</span><span class='op'><</span><span class='ident'>HashTag</span><span class='op'>></span>]<span class='op'>></span> {
<span class='kw'>match</span> <span class='self'>self</span> {
<span class='kw-2'>&</span><span class='ident'>HashTag</span>::<span class='ident'>List</span>(_,<span class='kw-2'>ref</span> <span class='ident'>l</span>) <span class='op'>=></span> <span class='prelude-val'>Some</span>(<span class='ident'>l</span>),
_ <span class='op'>=></span> <span class='prelude-val'>None</span>
}
}
<span class='doccomment'>/// Get Literal</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// If the hashtag has an associated literal be it</span>
<span class='doccomment'>/// `NameValue` or `Literal` this will return that</span>
<span class='doccomment'>/// value</span>
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>get_literal</span><span class='op'><</span><span class='lifetime'>'a</span><span class='op'>></span>(<span class='kw-2'>&</span><span class='lifetime'>'a</span> <span class='self'>self</span>) <span class='op'>-></span> <span class='prelude-ty'>Option</span><span class='op'><</span><span class='kw-2'>&</span><span class='lifetime'>'a</span> <span class='ident'>Lit</span><span class='op'>></span> {
<span class='kw'>match</span> <span class='self'>self</span> {
<span class='kw-2'>&</span><span class='ident'>HashTag</span>::<span class='ident'>Literal</span>(<span class='kw-2'>ref</span> <span class='ident'>l</span>) <span class='op'>|</span>
<span class='kw-2'>&</span><span class='ident'>HashTag</span>::<span class='ident'>NameValue</span>(_, <span class='kw-2'>ref</span> <span class='ident'>l</span>) <span class='op'>=></span> <span class='prelude-val'>Some</span>(<span class='ident'>l</span>),
_ <span class='op'>=></span> <span class='prelude-val'>None</span>
}
}
<span class='doccomment'>/// Get From Literal</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// Pre-Perform the conversion</span>
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>from_literal</span>(<span class='kw-2'>&</span><span class='self'>self</span>) <span class='op'>-></span> <span class='prelude-ty'>Option</span><span class='op'><</span><span class='ident'>FromLiteral</span><span class='op'>></span> {
<span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>get_literal</span>() {
<span class='prelude-ty'>Option</span>::<span class='prelude-val'>Some</span>(<span class='ident'>x</span>) <span class='op'>=></span> <span class='prelude-val'>Some</span>(<span class='ident'>FromLiteral</span>::<span class='ident'>from</span>(<span class='ident'>x</span>)),
_ <span class='op'>=></span> <span class='prelude-val'>None</span>
}
}
}
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