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</pre><pre class='rust '>
<span class='kw'>use</span> <span class='kw'>super</span>::{<span class='ident'>Fields</span>};
<span class='kw'>use</span> <span class='kw'>super</span>::<span class='kw'>super</span>::{<span class='ident'>Lit</span>,<span class='ident'>FromLiteral</span>};
<span class='kw'>use</span> <span class='kw'>super</span>::<span class='kw'>super</span>::<span class='ident'>syn</span>::{<span class='ident'>VariantData</span>,<span class='ident'>ConstExpr</span>,<span class='ident'>Variant</span> <span class='kw'>as</span> <span class='ident'>SynVariant</span>, <span class='ident'>Body</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'>/// There are multiple _types_ of structures in Rust.</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'>Structure</span> {
<span class='doccomment'>/// The normal structure which has several fields</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// Example: `pub struct AStruct{ a: u64, b: u64 }`</span>
<span class='ident'>NormalStruct</span>(<span class='ident'>Fields</span>),
<span class='doccomment'>/// A tuple struct which is just a named tuple</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// Example: `pub struct AStruct( u64, u64);`</span>
<span class='ident'>TupleStruct</span>(<span class='ident'>Fields</span>),
<span class='doccomment'>/// A structure that contains no data</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// Example: `pub struct ZeroSizedStruct;`</span>
<span class='ident'>Unit</span>,
<span class='doccomment'>/// Literal Value</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// A structure cannot actually be this type. But Enum's as they can be declared with a</span>
<span class='doccomment'>/// constant value.</span>
<span class='ident'>Discriminant</span>(<span class='ident'>Lit</span>)
}
<span class='kw'>impl</span> <span class='ident'>Structure</span> {
<span class='doccomment'>/// Build a structure from `syn`'s representation</span>
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>from_syn_variant</span>(<span class='ident'>x</span>: <span class='kw-2'>&</span><span class='ident'>SynVariant</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>Structure</span>,<span class='ident'>String</span><span class='op'>></span> {
<span class='kw'>match</span> <span class='kw-2'>&</span><span class='ident'>x</span>.<span class='ident'>discriminant</span> {
<span class='kw-2'>&</span><span class='prelude-ty'>Option</span>::<span class='prelude-val'>None</span> <span class='op'>=></span> { },
<span class='kw-2'>&</span><span class='prelude-ty'>Option</span>::<span class='prelude-val'>Some</span>(<span class='ident'>ConstExpr</span>::<span class='ident'>Lit</span>(<span class='kw-2'>ref</span> <span class='ident'>x</span>)) <span class='op'>=></span> <span class='kw'>return</span> <span class='prelude-val'>Ok</span>(<span class='ident'>Structure</span>::<span class='ident'>Discriminant</span>(<span class='ident'>x</span>.<span class='ident'>clone</span>())),
<span class='kw-2'>&</span><span class='prelude-ty'>Option</span>::<span class='prelude-val'>Some</span>(_) <span class='op'>=></span> <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='string'>"Encountered `Variant` who's discriminant existed BUT that value wasn't a literal"</span>.<span class='ident'>to_string</span>())
};
<span class='prelude-val'>Ok</span>(<span class='ident'>Structure</span>::<span class='ident'>from_variantdata</span>(<span class='kw-2'>&</span><span class='ident'>x</span>.<span class='ident'>data</span>))
}
<span class='doccomment'>/// Build a structure from `syn`'s representation</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'>from_variantdata</span>(<span class='ident'>x</span>: <span class='kw-2'>&</span><span class='ident'>VariantData</span>) <span class='op'>-></span> <span class='ident'>Structure</span> {
<span class='kw'>match</span> <span class='ident'>x</span> {
<span class='kw-2'>&</span><span class='ident'>VariantData</span>::<span class='ident'>Unit</span> <span class='op'>=></span> <span class='ident'>Structure</span>::<span class='ident'>Unit</span>,
<span class='kw-2'>&</span><span class='ident'>VariantData</span>::<span class='ident'>Tuple</span>(<span class='kw-2'>ref</span> <span class='ident'>f</span>) <span class='op'>=></span> <span class='ident'>Structure</span>::<span class='ident'>TupleStruct</span>(<span class='ident'>Fields</span>::<span class='ident'>from</span>(<span class='ident'>f</span>)),
<span class='kw-2'>&</span><span class='ident'>VariantData</span>::<span class='ident'>Struct</span>(<span class='kw-2'>ref</span> <span class='ident'>f</span>) <span class='op'>=></span> <span class='ident'>Structure</span>::<span class='ident'>NormalStruct</span>(<span class='ident'>Fields</span>::<span class='ident'>from</span>(<span class='ident'>f</span>))
}
}
<span class='doccomment'>/// Build from `syn`'s Body representation</span>
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>from_body</span>(<span class='ident'>x</span>: <span class='kw-2'>&</span><span class='ident'>Body</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>Structure</span>,<span class='ident'>String</span><span class='op'>></span> {
<span class='kw'>match</span> <span class='ident'>x</span> {
<span class='kw-2'>&</span><span class='ident'>Body</span>::<span class='ident'>Enum</span>(_) <span class='op'>=></span> <span class='prelude-val'>Err</span>(<span class='string'>"Attempted to parse struct but encountered a enum"</span>.<span class='ident'>to_string</span>()),
<span class='kw-2'>&</span><span class='ident'>Body</span>::<span class='ident'>Struct</span>(<span class='kw-2'>ref</span> <span class='ident'>x</span>) <span class='op'>=></span> <span class='prelude-val'>Ok</span>(<span class='ident'>Structure</span>::<span class='ident'>from_variantdata</span>(<span class='ident'>x</span>))
}
}
<span class='macro'>is_thing</span><span class='macro'>!</span>(<span class='ident'>is_unit</span>,<span class='kw-2'>&</span><span class='ident'>Structure</span>::<span class='ident'>Unit</span>);
<span class='macro'>is_thing</span><span class='macro'>!</span>(<span class='ident'>is_norm</span>,<span class='kw-2'>&</span><span class='ident'>Structure</span>::<span class='ident'>NormalStruct</span>(_));
<span class='macro'>is_thing</span><span class='macro'>!</span>(<span class='ident'>is_tuple</span>,<span class='kw-2'>&</span><span class='ident'>Structure</span>::<span class='ident'>TupleStruct</span>(_));
<span class='macro'>is_thing</span><span class='macro'>!</span>(<span class='ident'>is_discriminant</span>,<span class='kw-2'>&</span><span class='ident'>Structure</span>::<span class='ident'>Discriminant</span>(_));
<span class='doccomment'>/// Get Fields</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// Returns Fields if this Struct is a Tuple or Normal</span>
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>get_fields</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'>Fields</span><span class='op'>></span> {
<span class='kw'>match</span> <span class='self'>self</span> {
<span class='kw-2'>&</span><span class='ident'>Structure</span>::<span class='ident'>NormalStruct</span>(<span class='kw-2'>ref</span> <span class='ident'>f</span>) <span class='op'>|</span>
<span class='kw-2'>&</span><span class='ident'>Structure</span>::<span class='ident'>TupleStruct</span>(<span class='kw-2'>ref</span> <span class='ident'>f</span>) <span class='op'>=></span> <span class='prelude-val'>Some</span>(<span class='ident'>f</span>),
_ <span class='op'>=></span> <span class='prelude-val'>None</span>
}
}
<span class='doccomment'>/// Get Literal</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// Returns the literal value if this is a Discrimninat structure</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'>Structure</span>::<span class='ident'>Discriminant</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>
}
}
}
</pre>
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