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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `diesel_derives/src/sql_function.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>sql_function.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" type="text/css" href="../../normalize.css"><link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../ayu.css" disabled><link rel="stylesheet" type="text/css" href="../../dark.css" disabled><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script defer src="../../source-script.js"></script><script defer src="../../source-files.js"></script><script defer src="../../main.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle">☰</button><a class="sidebar-logo" href="../../diesel_derives/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div>
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</pre><pre class="rust"><code><span class="kw">use</span> <span class="ident">proc_macro2::TokenStream</span>;
<span class="kw">use</span> <span class="ident">quote::ToTokens</span>;
<span class="kw">use</span> <span class="ident">syn::parse</span>::{<span class="ident">Parse</span>, <span class="ident">ParseStream</span>, <span class="prelude-ty">Result</span>};
<span class="kw">use</span> <span class="ident">syn::punctuated::Punctuated</span>;
<span class="kw">use</span> <span class="ident">syn</span>::{
<span class="ident">Attribute</span>, <span class="ident">GenericArgument</span>, <span class="ident">Generics</span>, <span class="ident">Ident</span>, <span class="ident">Lit</span>, <span class="ident">Meta</span>, <span class="ident">MetaNameValue</span>, <span class="ident">PathArguments</span>, <span class="ident">Type</span>,
};
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">expand</span>(<span class="ident">input</span>: <span class="ident">SqlFunctionDecl</span>) -> <span class="ident">TokenStream</span> {
<span class="kw">let</span> <span class="ident">SqlFunctionDecl</span> {
<span class="kw-2">mut</span> <span class="ident">attributes</span>,
<span class="ident">fn_token</span>,
<span class="ident">fn_name</span>,
<span class="kw-2">mut</span> <span class="ident">generics</span>,
<span class="ident">args</span>,
<span class="ident">return_type</span>,
} <span class="op">=</span> <span class="ident">input</span>;
<span class="kw">let</span> <span class="ident">sql_name</span> <span class="op">=</span> <span class="ident">attributes</span>
.<span class="ident">iter</span>()
.<span class="ident">find</span>(<span class="op">|</span><span class="ident">attr</span><span class="op">|</span> {
<span class="ident">attr</span>.<span class="ident">parse_meta</span>()
.<span class="ident">map</span>(<span class="op">|</span><span class="ident">m</span><span class="op">|</span> <span class="ident">m</span>.<span class="ident">path</span>().<span class="ident">is_ident</span>(<span class="string">"sql_name"</span>))
.<span class="ident">unwrap_or</span>(<span class="bool-val">false</span>)
})
.<span class="ident">and_then</span>(<span class="op">|</span><span class="ident">attr</span><span class="op">|</span> {
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Ok</span>(<span class="ident">Meta::NameValue</span>(<span class="ident">MetaNameValue</span> {
<span class="ident">lit</span>: <span class="ident">Lit::Str</span>(<span class="ident">lit</span>), ..
})) <span class="op">=</span> <span class="ident">attr</span>.<span class="ident">parse_meta</span>()
{
<span class="prelude-val">Some</span>(<span class="ident">lit</span>.<span class="ident">value</span>())
} <span class="kw">else</span> {
<span class="prelude-val">None</span>
}
})
.<span class="ident">unwrap_or_else</span>(<span class="op">|</span><span class="op">|</span> <span class="ident">fn_name</span>.<span class="ident">to_string</span>());
<span class="kw">let</span> <span class="ident">is_aggregate</span> <span class="op">=</span> <span class="ident">attributes</span>.<span class="ident">iter</span>().<span class="ident">any</span>(<span class="op">|</span><span class="ident">attr</span><span class="op">|</span> {
<span class="ident">attr</span>.<span class="ident">parse_meta</span>()
.<span class="ident">map</span>(<span class="op">|</span><span class="ident">m</span><span class="op">|</span> <span class="ident">m</span>.<span class="ident">path</span>().<span class="ident">is_ident</span>(<span class="string">"aggregate"</span>))
.<span class="ident">unwrap_or</span>(<span class="bool-val">false</span>)
});
<span class="ident">attributes</span>.<span class="ident">retain</span>(<span class="op">|</span><span class="ident">attr</span><span class="op">|</span> {
<span class="ident">attr</span>.<span class="ident">parse_meta</span>()
.<span class="ident">map</span>(<span class="op">|</span><span class="ident">m</span><span class="op">|</span> <span class="op">!</span><span class="ident">m</span>.<span class="ident">path</span>().<span class="ident">is_ident</span>(<span class="string">"sql_name"</span>) <span class="op">&&</span> <span class="op">!</span><span class="ident">m</span>.<span class="ident">path</span>().<span class="ident">is_ident</span>(<span class="string">"aggregate"</span>))
.<span class="ident">unwrap_or</span>(<span class="bool-val">true</span>)
});
<span class="kw">let</span> <span class="ident">args</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">args</span>;
<span class="kw">let</span> (<span class="kw-2">ref</span> <span class="ident">arg_name</span>, <span class="kw-2">ref</span> <span class="ident">arg_type</span>): (<span class="ident">Vec</span><span class="op"><</span><span class="kw">_</span><span class="op">></span>, <span class="ident">Vec</span><span class="op"><</span><span class="kw">_</span><span class="op">></span>) <span class="op">=</span> <span class="ident">args</span>
.<span class="ident">iter</span>()
.<span class="ident">map</span>(<span class="op">|</span><span class="ident">StrictFnArg</span> { <span class="ident">name</span>, <span class="ident">ty</span>, .. }<span class="op">|</span> (<span class="ident">name</span>, <span class="ident">ty</span>))
.<span class="ident">unzip</span>();
<span class="kw">let</span> <span class="ident">arg_struct_assign</span> <span class="op">=</span> <span class="ident">args</span>.<span class="ident">iter</span>().<span class="ident">map</span>(
<span class="op">|</span><span class="ident">StrictFnArg</span> {
<span class="ident">name</span>, <span class="ident">colon_token</span>, ..
}<span class="op">|</span> {
<span class="kw">let</span> <span class="ident">name2</span> <span class="op">=</span> <span class="ident">name</span>.<span class="ident">clone</span>();
<span class="macro">quote!</span>(#<span class="ident">name</span> #<span class="ident">colon_token</span> #<span class="ident">name2</span>.<span class="ident">as_expression</span>())
},
);
<span class="kw">let</span> <span class="ident">type_args</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">generics</span>
.<span class="ident">type_params</span>()
.<span class="ident">map</span>(<span class="op">|</span><span class="ident">type_param</span><span class="op">|</span> <span class="ident">type_param</span>.<span class="ident">ident</span>.<span class="ident">clone</span>())
.<span class="ident">collect</span>::<span class="op"><</span><span class="ident">Vec</span><span class="op"><</span><span class="kw">_</span><span class="op">></span><span class="op">></span>();
<span class="kw">for</span> <span class="ident">StrictFnArg</span> { <span class="ident">name</span>, .. } <span class="kw">in</span> <span class="ident">args</span> {
<span class="ident">generics</span>.<span class="ident">params</span>.<span class="ident">push</span>(<span class="macro">parse_quote!</span>(#<span class="ident">name</span>));
}
<span class="kw">let</span> (<span class="ident">impl_generics</span>, <span class="ident">ty_generics</span>, <span class="ident">where_clause</span>) <span class="op">=</span> <span class="ident">generics</span>.<span class="ident">split_for_impl</span>();
<span class="comment">// Even if we force an empty where clause, it still won't print the where</span>
<span class="comment">// token with no bounds.</span>
<span class="kw">let</span> <span class="ident">where_clause</span> <span class="op">=</span> <span class="ident">where_clause</span>
.<span class="ident">map</span>(<span class="op">|</span><span class="ident">w</span><span class="op">|</span> <span class="macro">quote!</span>(#<span class="ident">w</span>))
.<span class="ident">unwrap_or_else</span>(<span class="op">|</span><span class="op">|</span> <span class="macro">quote!</span>(<span class="kw">where</span>));
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">generics_with_internal</span> <span class="op">=</span> <span class="ident">generics</span>.<span class="ident">clone</span>();
<span class="ident">generics_with_internal</span>
.<span class="ident">params</span>
.<span class="ident">push</span>(<span class="macro">parse_quote!</span>(<span class="ident">__DieselInternal</span>));
<span class="kw">let</span> (<span class="ident">impl_generics_internal</span>, <span class="kw">_</span>, <span class="kw">_</span>) <span class="op">=</span> <span class="ident">generics_with_internal</span>.<span class="ident">split_for_impl</span>();
<span class="kw">let</span> <span class="ident">sql_type</span>;
<span class="kw">let</span> <span class="ident">numeric_derive</span>;
<span class="kw">if</span> <span class="ident">arg_name</span>.<span class="ident">is_empty</span>() {
<span class="ident">sql_type</span> <span class="op">=</span> <span class="prelude-val">None</span>;
<span class="comment">// FIXME: We can always derive once trivial bounds are stable</span>
<span class="ident">numeric_derive</span> <span class="op">=</span> <span class="prelude-val">None</span>;
} <span class="kw">else</span> {
<span class="ident">sql_type</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="macro">quote!</span>((#(#<span class="ident">arg_name</span>),<span class="kw-2">*</span>): <span class="ident">Expression</span>,));
<span class="ident">numeric_derive</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="macro">quote!</span>(<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">diesel::sql_types::DieselNumericOps</span>)]</span>));
}
<span class="kw">let</span> <span class="ident">args_iter</span> <span class="op">=</span> <span class="ident">args</span>.<span class="ident">iter</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">tokens</span> <span class="op">=</span> <span class="macro">quote!</span> {
<span class="kw">use</span> <span class="ident">diesel</span>::{<span class="self">self</span>, <span class="ident">QueryResult</span>};
<span class="kw">use</span> <span class="ident">diesel::expression</span>::{<span class="ident">AsExpression</span>, <span class="ident">Expression</span>, <span class="ident">SelectableExpression</span>, <span class="ident">AppearsOnTable</span>, <span class="ident">ValidGrouping</span>};
<span class="kw">use</span> <span class="ident">diesel::query_builder</span>::{<span class="ident">QueryFragment</span>, <span class="ident">AstPass</span>};
<span class="kw">use</span> <span class="ident">diesel::sql_types</span>::<span class="kw-2">*</span>;
<span class="kw">use</span> <span class="kw">super</span>::<span class="kw-2">*</span>;
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">Clone</span>, <span class="ident">Copy</span>, <span class="ident">diesel::query_builder::QueryId</span>)]</span>
#<span class="ident">numeric_derive</span>
<span class="kw">pub</span> <span class="kw">struct</span> #<span class="ident">fn_name</span> #<span class="ident">ty_generics</span> {
#(<span class="kw">pub</span>(<span class="kw">in</span> <span class="kw">super</span>) #<span class="ident">args_iter</span>,)<span class="op">*</span>
#(<span class="kw">pub</span>(<span class="kw">in</span> <span class="kw">super</span>) #<span class="ident">type_args</span>: <span class="ident">::std::marker::PhantomData</span><span class="op"><</span>#<span class="ident">type_args</span><span class="op">></span>,)<span class="op">*</span>
}
<span class="kw">pub</span> <span class="kw">type</span> <span class="ident">HelperType</span> #<span class="ident">ty_generics</span> <span class="op">=</span> #<span class="ident">fn_name</span> <span class="op"><</span>
#(#<span class="ident">type_args</span>,)<span class="op">*</span>
#(<span class="op"><</span>#<span class="ident">arg_name</span> <span class="kw">as</span> <span class="ident">AsExpression</span><span class="op"><</span>#<span class="ident">arg_type</span><span class="op">></span><span class="op">></span><span class="ident">::Expression</span>,)<span class="op">*</span>
<span class="op">></span>;
<span class="kw">impl</span> #<span class="ident">impl_generics</span> <span class="ident">Expression</span> <span class="kw">for</span> #<span class="ident">fn_name</span> #<span class="ident">ty_generics</span>
#<span class="ident">where_clause</span>
#<span class="ident">sql_type</span>
{
<span class="kw">type</span> <span class="ident">SqlType</span> <span class="op">=</span> #<span class="ident">return_type</span>;
}
<span class="comment">// __DieselInternal is what we call QS normally</span>
<span class="kw">impl</span> #<span class="ident">impl_generics_internal</span> <span class="ident">SelectableExpression</span><span class="op"><</span><span class="ident">__DieselInternal</span><span class="op">></span>
<span class="kw">for</span> #<span class="ident">fn_name</span> #<span class="ident">ty_generics</span>
#<span class="ident">where_clause</span>
#(#<span class="ident">arg_name</span>: <span class="ident">SelectableExpression</span><span class="op"><</span><span class="ident">__DieselInternal</span><span class="op">></span>,)<span class="op">*</span>
<span class="self">Self</span>: <span class="ident">AppearsOnTable</span><span class="op"><</span><span class="ident">__DieselInternal</span><span class="op">></span>,
{
}
<span class="comment">// __DieselInternal is what we call QS normally</span>
<span class="kw">impl</span> #<span class="ident">impl_generics_internal</span> <span class="ident">AppearsOnTable</span><span class="op"><</span><span class="ident">__DieselInternal</span><span class="op">></span>
<span class="kw">for</span> #<span class="ident">fn_name</span> #<span class="ident">ty_generics</span>
#<span class="ident">where_clause</span>
#(#<span class="ident">arg_name</span>: <span class="ident">AppearsOnTable</span><span class="op"><</span><span class="ident">__DieselInternal</span><span class="op">></span>,)<span class="op">*</span>
<span class="self">Self</span>: <span class="ident">Expression</span>,
{
}
<span class="comment">// __DieselInternal is what we call DB normally</span>
<span class="kw">impl</span> #<span class="ident">impl_generics_internal</span> <span class="ident">QueryFragment</span><span class="op"><</span><span class="ident">__DieselInternal</span><span class="op">></span>
<span class="kw">for</span> #<span class="ident">fn_name</span> #<span class="ident">ty_generics</span>
<span class="kw">where</span>
<span class="ident">__DieselInternal</span>: <span class="ident">diesel::backend::Backend</span>,
#(#<span class="ident">arg_name</span>: <span class="ident">QueryFragment</span><span class="op"><</span><span class="ident">__DieselInternal</span><span class="op">></span>,)<span class="op">*</span>
{
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">unused_assignments</span>)]</span>
<span class="kw">fn</span> <span class="ident">walk_ast</span><span class="op"><</span><span class="lifetime">'__b</span><span class="op">></span>(<span class="kw-2">&</span><span class="lifetime">'__b</span> <span class="self">self</span>, <span class="kw-2">mut</span> <span class="ident">out</span>: <span class="ident">AstPass</span><span class="op"><</span><span class="lifetime">'_</span>, <span class="lifetime">'__b</span>, <span class="ident">__DieselInternal</span><span class="op">></span>) -> <span class="ident">QueryResult</span><span class="op"><</span>()<span class="op">></span>{
<span class="ident">out</span>.<span class="ident">push_sql</span>(<span class="macro">concat!</span>(#<span class="ident">sql_name</span>, <span class="string">"("</span>));
<span class="comment">// we unroll the arguments manually here, to prevent borrow check issues</span>
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">needs_comma</span> <span class="op">=</span> <span class="bool-val">false</span>;
#(
<span class="kw">if</span> <span class="op">!</span><span class="self">self</span>.#<span class="ident">arg_name</span>.<span class="ident">is_noop</span>(<span class="ident">out</span>.<span class="ident">backend</span>())<span class="question-mark">?</span> {
<span class="kw">if</span> <span class="ident">needs_comma</span> {
<span class="ident">out</span>.<span class="ident">push_sql</span>(<span class="string">", "</span>);
}
<span class="self">self</span>.#<span class="ident">arg_name</span>.<span class="ident">walk_ast</span>(<span class="ident">out</span>.<span class="ident">reborrow</span>())<span class="question-mark">?</span>;
<span class="ident">needs_comma</span> <span class="op">=</span> <span class="bool-val">true</span>;
}
)<span class="op">*</span>
<span class="ident">out</span>.<span class="ident">push_sql</span>(<span class="string">")"</span>);
<span class="prelude-val">Ok</span>(())
}
}
};
<span class="kw">let</span> <span class="ident">is_supported_on_sqlite</span> <span class="op">=</span> <span class="macro">cfg!</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"sqlite"</span>)
<span class="op">&&</span> <span class="ident">type_args</span>.<span class="ident">is_empty</span>()
<span class="op">&&</span> <span class="ident">is_sqlite_type</span>(<span class="kw-2">&</span><span class="ident">return_type</span>)
<span class="op">&&</span> <span class="ident">arg_type</span>.<span class="ident">iter</span>().<span class="ident">all</span>(<span class="op">|</span><span class="ident">a</span><span class="op">|</span> <span class="ident">is_sqlite_type</span>(<span class="ident">a</span>));
<span class="kw">if</span> <span class="ident">is_aggregate</span> {
<span class="ident">tokens</span> <span class="op">=</span> <span class="macro">quote!</span> {
#<span class="ident">tokens</span>
<span class="kw">impl</span> #<span class="ident">impl_generics_internal</span> <span class="ident">ValidGrouping</span><span class="op"><</span><span class="ident">__DieselInternal</span><span class="op">></span>
<span class="kw">for</span> #<span class="ident">fn_name</span> #<span class="ident">ty_generics</span>
{
<span class="kw">type</span> <span class="ident">IsAggregate</span> <span class="op">=</span> <span class="ident">diesel::expression::is_aggregate::Yes</span>;
}
};
<span class="kw">if</span> <span class="ident">is_supported_on_sqlite</span> {
<span class="ident">tokens</span> <span class="op">=</span> <span class="macro">quote!</span> {
#<span class="ident">tokens</span>
<span class="kw">use</span> <span class="ident">diesel::sqlite</span>::{<span class="ident">Sqlite</span>, <span class="ident">SqliteConnection</span>};
<span class="kw">use</span> <span class="ident">diesel::serialize::ToSql</span>;
<span class="kw">use</span> <span class="ident">diesel::deserialize</span>::{<span class="ident">FromSqlRow</span>, <span class="ident">StaticallySizedRow</span>};
<span class="kw">use</span> <span class="ident">diesel::sqlite::SqliteAggregateFunction</span>;
<span class="kw">use</span> <span class="ident">diesel::sql_types::IntoNullable</span>;
};
<span class="kw">match</span> <span class="ident">arg_name</span>.<span class="ident">len</span>() {
<span class="ident">x</span> <span class="kw">if</span> <span class="ident">x</span> <span class="op">></span> <span class="number">1</span> => {
<span class="ident">tokens</span> <span class="op">=</span> <span class="macro">quote!</span> {
#<span class="ident">tokens</span>
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">dead_code</span>)]</span>
<span class="doccomment">/// Registers an implementation for this aggregate function on the given connection</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This function must be called for every `SqliteConnection` before</span>
<span class="doccomment">/// this SQL function can be used on SQLite. The implementation must be</span>
<span class="doccomment">/// deterministic (returns the same result given the same arguments).</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">register_impl</span><span class="op"><</span><span class="ident">A</span>, #(#<span class="ident">arg_name</span>,)<span class="kw-2">*</span><span class="op">></span>(
<span class="ident">conn</span>: <span class="kw-2">&mut</span> <span class="ident">SqliteConnection</span>
) -> <span class="ident">QueryResult</span><span class="op"><</span>()<span class="op">></span>
<span class="kw">where</span>
<span class="ident">A</span>: <span class="ident">SqliteAggregateFunction</span><span class="op"><</span>(#(#<span class="ident">arg_name</span>,)<span class="kw-2">*</span>)<span class="op">></span>
<span class="op">+</span> <span class="ident">Send</span>
<span class="op">+</span> <span class="lifetime">'static</span>
<span class="op">+</span> <span class="ident">::std::panic::UnwindSafe</span>
<span class="op">+</span> <span class="ident">::std::panic::RefUnwindSafe</span>,
<span class="ident">A::Output</span>: <span class="ident">ToSql</span><span class="op"><</span>#<span class="ident">return_type</span>, <span class="ident">Sqlite</span><span class="op">></span>,
(#(#<span class="ident">arg_name</span>,)<span class="kw-2">*</span>): <span class="ident">FromSqlRow</span><span class="op"><</span>(#(#<span class="ident">arg_type</span>,)<span class="kw-2">*</span>), <span class="ident">Sqlite</span><span class="op">></span> <span class="op">+</span>
<span class="ident">StaticallySizedRow</span><span class="op"><</span>(#(#<span class="ident">arg_type</span>,)<span class="kw-2">*</span>), <span class="ident">Sqlite</span><span class="op">></span> <span class="op">+</span>
<span class="ident">::std::panic::UnwindSafe</span>,
{
<span class="ident">conn</span>.<span class="ident">register_aggregate_function</span>::<span class="op"><</span>(#(#<span class="ident">arg_type</span>,)<span class="kw-2">*</span>), #<span class="ident">return_type</span>, <span class="kw">_</span>, <span class="kw">_</span>, <span class="ident">A</span><span class="op">></span>(#<span class="ident">sql_name</span>)
}
};
}
<span class="ident">x</span> <span class="kw">if</span> <span class="ident">x</span> <span class="op">==</span> <span class="number">1</span> => {
<span class="kw">let</span> <span class="ident">arg_name</span> <span class="op">=</span> <span class="ident">arg_name</span>[<span class="number">0</span>];
<span class="kw">let</span> <span class="ident">arg_type</span> <span class="op">=</span> <span class="ident">arg_type</span>[<span class="number">0</span>];
<span class="ident">tokens</span> <span class="op">=</span> <span class="macro">quote!</span> {
#<span class="ident">tokens</span>
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">dead_code</span>)]</span>
<span class="doccomment">/// Registers an implementation for this aggregate function on the given connection</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This function must be called for every `SqliteConnection` before</span>
<span class="doccomment">/// this SQL function can be used on SQLite. The implementation must be</span>
<span class="doccomment">/// deterministic (returns the same result given the same arguments).</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">register_impl</span><span class="op"><</span><span class="ident">A</span>, #<span class="ident">arg_name</span><span class="op">></span>(
<span class="ident">conn</span>: <span class="kw-2">&mut</span> <span class="ident">SqliteConnection</span>
) -> <span class="ident">QueryResult</span><span class="op"><</span>()<span class="op">></span>
<span class="kw">where</span>
<span class="ident">A</span>: <span class="ident">SqliteAggregateFunction</span><span class="op"><</span>#<span class="ident">arg_name</span><span class="op">></span>
<span class="op">+</span> <span class="ident">Send</span>
<span class="op">+</span> <span class="lifetime">'static</span>
<span class="op">+</span> <span class="ident">std::panic::UnwindSafe</span>
<span class="op">+</span> <span class="ident">std::panic::RefUnwindSafe</span>,
<span class="ident">A::Output</span>: <span class="ident">ToSql</span><span class="op"><</span>#<span class="ident">return_type</span>, <span class="ident">Sqlite</span><span class="op">></span>,
#<span class="ident">arg_name</span>: <span class="ident">FromSqlRow</span><span class="op"><</span>#<span class="ident">arg_type</span>, <span class="ident">Sqlite</span><span class="op">></span> <span class="op">+</span>
<span class="ident">StaticallySizedRow</span><span class="op"><</span>#<span class="ident">arg_type</span>, <span class="ident">Sqlite</span><span class="op">></span> <span class="op">+</span>
<span class="ident">::std::panic::UnwindSafe</span>,
{
<span class="ident">conn</span>.<span class="ident">register_aggregate_function</span>::<span class="op"><</span>#<span class="ident">arg_type</span>, #<span class="ident">return_type</span>, <span class="kw">_</span>, <span class="kw">_</span>, <span class="ident">A</span><span class="op">></span>(#<span class="ident">sql_name</span>)
}
};
}
<span class="kw">_</span> => (),
}
}
} <span class="kw">else</span> {
<span class="ident">tokens</span> <span class="op">=</span> <span class="macro">quote!</span> {
#<span class="ident">tokens</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">ValidGrouping</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">__Derived</span><span class="op"><</span>#(#<span class="ident">arg_name</span>,)<span class="kw-2">*</span><span class="op">></span>(#(#<span class="ident">arg_name</span>,)<span class="kw-2">*</span>);
<span class="kw">impl</span> #<span class="ident">impl_generics_internal</span> <span class="ident">ValidGrouping</span><span class="op"><</span><span class="ident">__DieselInternal</span><span class="op">></span>
<span class="kw">for</span> #<span class="ident">fn_name</span> #<span class="ident">ty_generics</span>
<span class="kw">where</span>
<span class="ident">__Derived</span><span class="op"><</span>#(#<span class="ident">arg_name</span>,)<span class="kw-2">*</span><span class="op">></span>: <span class="ident">ValidGrouping</span><span class="op"><</span><span class="ident">__DieselInternal</span><span class="op">></span>,
{
<span class="kw">type</span> <span class="ident">IsAggregate</span> <span class="op">=</span> <span class="op"><</span><span class="ident">__Derived</span><span class="op"><</span>#(#<span class="ident">arg_name</span>,)<span class="kw-2">*</span><span class="op">></span> <span class="kw">as</span> <span class="ident">ValidGrouping</span><span class="op"><</span><span class="ident">__DieselInternal</span><span class="op">></span><span class="op">></span><span class="ident">::IsAggregate</span>;
}
};
<span class="kw">if</span> <span class="ident">is_supported_on_sqlite</span> <span class="op">&&</span> <span class="op">!</span><span class="ident">arg_name</span>.<span class="ident">is_empty</span>() {
<span class="ident">tokens</span> <span class="op">=</span> <span class="macro">quote!</span> {
#<span class="ident">tokens</span>
<span class="kw">use</span> <span class="ident">diesel::sqlite</span>::{<span class="ident">Sqlite</span>, <span class="ident">SqliteConnection</span>};
<span class="kw">use</span> <span class="ident">diesel::serialize::ToSql</span>;
<span class="kw">use</span> <span class="ident">diesel::deserialize</span>::{<span class="ident">FromSqlRow</span>, <span class="ident">StaticallySizedRow</span>};
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">dead_code</span>)]</span>
<span class="doccomment">/// Registers an implementation for this function on the given connection</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This function must be called for every `SqliteConnection` before</span>
<span class="doccomment">/// this SQL function can be used on SQLite. The implementation must be</span>
<span class="doccomment">/// deterministic (returns the same result given the same arguments). If</span>
<span class="doccomment">/// the function is nondeterministic, call</span>
<span class="doccomment">/// `register_nondeterministic_impl` instead.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">register_impl</span><span class="op"><</span><span class="ident">F</span>, <span class="ident">Ret</span>, #(#<span class="ident">arg_name</span>,)<span class="kw-2">*</span><span class="op">></span>(
<span class="ident">conn</span>: <span class="kw-2">&mut</span> <span class="ident">SqliteConnection</span>,
<span class="ident">f</span>: <span class="ident">F</span>,
) -> <span class="ident">QueryResult</span><span class="op"><</span>()<span class="op">></span>
<span class="kw">where</span>
<span class="ident">F</span>: <span class="ident">Fn</span>(#(#<span class="ident">arg_name</span>,)<span class="kw-2">*</span>) -> <span class="ident">Ret</span> <span class="op">+</span> <span class="ident">std::panic::UnwindSafe</span> <span class="op">+</span> <span class="ident">Send</span> <span class="op">+</span> <span class="lifetime">'static</span>,
(#(#<span class="ident">arg_name</span>,)<span class="kw-2">*</span>): <span class="ident">FromSqlRow</span><span class="op"><</span>(#(#<span class="ident">arg_type</span>,)<span class="kw-2">*</span>), <span class="ident">Sqlite</span><span class="op">></span> <span class="op">+</span>
<span class="ident">StaticallySizedRow</span><span class="op"><</span>(#(#<span class="ident">arg_type</span>,)<span class="kw-2">*</span>), <span class="ident">Sqlite</span><span class="op">></span>,
<span class="ident">Ret</span>: <span class="ident">ToSql</span><span class="op"><</span>#<span class="ident">return_type</span>, <span class="ident">Sqlite</span><span class="op">></span>,
{
<span class="ident">conn</span>.<span class="ident">register_sql_function</span>::<span class="op"><</span>(#(#<span class="ident">arg_type</span>,)<span class="kw-2">*</span>), #<span class="ident">return_type</span>, <span class="kw">_</span>, <span class="kw">_</span>, <span class="kw">_</span><span class="op">></span>(
#<span class="ident">sql_name</span>,
<span class="bool-val">true</span>,
<span class="kw">move</span> <span class="op">|</span>(#(#<span class="ident">arg_name</span>,)<span class="kw-2">*</span>)<span class="op">|</span> <span class="ident">f</span>(#(#<span class="ident">arg_name</span>,)<span class="kw-2">*</span>),
)
}
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">dead_code</span>)]</span>
<span class="doccomment">/// Registers an implementation for this function on the given connection</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This function must be called for every `SqliteConnection` before</span>
<span class="doccomment">/// this SQL function can be used on SQLite.</span>
<span class="doccomment">/// `register_nondeterministic_impl` should only be used if your</span>
<span class="doccomment">/// function can return different results with the same arguments (e.g.</span>
<span class="doccomment">/// `random`). If your function is deterministic, you should call</span>
<span class="doccomment">/// `register_impl` instead.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">register_nondeterministic_impl</span><span class="op"><</span><span class="ident">F</span>, <span class="ident">Ret</span>, #(#<span class="ident">arg_name</span>,)<span class="kw-2">*</span><span class="op">></span>(
<span class="ident">conn</span>: <span class="kw-2">&mut</span> <span class="ident">SqliteConnection</span>,
<span class="kw-2">mut</span> <span class="ident">f</span>: <span class="ident">F</span>,
) -> <span class="ident">QueryResult</span><span class="op"><</span>()<span class="op">></span>
<span class="kw">where</span>
<span class="ident">F</span>: <span class="ident">FnMut</span>(#(#<span class="ident">arg_name</span>,)<span class="kw-2">*</span>) -> <span class="ident">Ret</span> <span class="op">+</span> <span class="ident">std::panic::UnwindSafe</span> <span class="op">+</span> <span class="ident">Send</span> <span class="op">+</span> <span class="lifetime">'static</span>,
(#(#<span class="ident">arg_name</span>,)<span class="kw-2">*</span>): <span class="ident">FromSqlRow</span><span class="op"><</span>(#(#<span class="ident">arg_type</span>,)<span class="kw-2">*</span>), <span class="ident">Sqlite</span><span class="op">></span> <span class="op">+</span>
<span class="ident">StaticallySizedRow</span><span class="op"><</span>(#(#<span class="ident">arg_type</span>,)<span class="kw-2">*</span>), <span class="ident">Sqlite</span><span class="op">></span>,
<span class="ident">Ret</span>: <span class="ident">ToSql</span><span class="op"><</span>#<span class="ident">return_type</span>, <span class="ident">Sqlite</span><span class="op">></span>,
{
<span class="ident">conn</span>.<span class="ident">register_sql_function</span>::<span class="op"><</span>(#(#<span class="ident">arg_type</span>,)<span class="kw-2">*</span>), #<span class="ident">return_type</span>, <span class="kw">_</span>, <span class="kw">_</span>, <span class="kw">_</span><span class="op">></span>(
#<span class="ident">sql_name</span>,
<span class="bool-val">false</span>,
<span class="kw">move</span> <span class="op">|</span>(#(#<span class="ident">arg_name</span>,)<span class="kw-2">*</span>)<span class="op">|</span> <span class="ident">f</span>(#(#<span class="ident">arg_name</span>,)<span class="kw-2">*</span>),
)
}
};
}
<span class="kw">if</span> <span class="ident">is_supported_on_sqlite</span> <span class="op">&&</span> <span class="ident">arg_name</span>.<span class="ident">is_empty</span>() {
<span class="ident">tokens</span> <span class="op">=</span> <span class="macro">quote!</span> {
#<span class="ident">tokens</span>
<span class="kw">use</span> <span class="ident">diesel::sqlite</span>::{<span class="ident">Sqlite</span>, <span class="ident">SqliteConnection</span>};
<span class="kw">use</span> <span class="ident">diesel::serialize::ToSql</span>;
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">dead_code</span>)]</span>
<span class="doccomment">/// Registers an implementation for this function on the given connection</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This function must be called for every `SqliteConnection` before</span>
<span class="doccomment">/// this SQL function can be used on SQLite. The implementation must be</span>
<span class="doccomment">/// deterministic (returns the same result given the same arguments). If</span>
<span class="doccomment">/// the function is nondeterministic, call</span>
<span class="doccomment">/// `register_nondeterministic_impl` instead.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">register_impl</span><span class="op"><</span><span class="ident">F</span>, <span class="ident">Ret</span><span class="op">></span>(
<span class="ident">conn</span>: <span class="kw-2">&</span><span class="ident">SqliteConnection</span>,
<span class="ident">f</span>: <span class="ident">F</span>,
) -> <span class="ident">QueryResult</span><span class="op"><</span>()<span class="op">></span>
<span class="kw">where</span>
<span class="ident">F</span>: <span class="ident">Fn</span>() -> <span class="ident">Ret</span> <span class="op">+</span> <span class="ident">std::panic::UnwindSafe</span> <span class="op">+</span> <span class="ident">Send</span> <span class="op">+</span> <span class="lifetime">'static</span>,
<span class="ident">Ret</span>: <span class="ident">ToSql</span><span class="op"><</span>#<span class="ident">return_type</span>, <span class="ident">Sqlite</span><span class="op">></span>,
{
<span class="ident">conn</span>.<span class="ident">register_noarg_sql_function</span>::<span class="op"><</span>#<span class="ident">return_type</span>, <span class="kw">_</span>, <span class="kw">_</span><span class="op">></span>(
#<span class="ident">sql_name</span>,
<span class="bool-val">true</span>,
<span class="ident">f</span>,
)
}
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">dead_code</span>)]</span>
<span class="doccomment">/// Registers an implementation for this function on the given connection</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This function must be called for every `SqliteConnection` before</span>
<span class="doccomment">/// this SQL function can be used on SQLite.</span>
<span class="doccomment">/// `register_nondeterministic_impl` should only be used if your</span>
<span class="doccomment">/// function can return different results with the same arguments (e.g.</span>
<span class="doccomment">/// `random`). If your function is deterministic, you should call</span>
<span class="doccomment">/// `register_impl` instead.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">register_nondeterministic_impl</span><span class="op"><</span><span class="ident">F</span>, <span class="ident">Ret</span><span class="op">></span>(
<span class="ident">conn</span>: <span class="kw-2">&</span><span class="ident">SqliteConnection</span>,
<span class="kw-2">mut</span> <span class="ident">f</span>: <span class="ident">F</span>,
) -> <span class="ident">QueryResult</span><span class="op"><</span>()<span class="op">></span>
<span class="kw">where</span>
<span class="ident">F</span>: <span class="ident">FnMut</span>() -> <span class="ident">Ret</span> <span class="op">+</span> <span class="ident">std::panic::UnwindSafe</span> <span class="op">+</span> <span class="ident">Send</span> <span class="op">+</span> <span class="lifetime">'static</span>,
<span class="ident">Ret</span>: <span class="ident">ToSql</span><span class="op"><</span>#<span class="ident">return_type</span>, <span class="ident">Sqlite</span><span class="op">></span>,
{
<span class="ident">conn</span>.<span class="ident">register_noarg_sql_function</span>::<span class="op"><</span>#<span class="ident">return_type</span>, <span class="kw">_</span>, <span class="kw">_</span><span class="op">></span>(
#<span class="ident">sql_name</span>,
<span class="bool-val">false</span>,
<span class="ident">f</span>,
)
}
};
}
}
<span class="kw">let</span> <span class="ident">args_iter</span> <span class="op">=</span> <span class="ident">args</span>.<span class="ident">iter</span>();
<span class="macro">quote!</span> {
#(#<span class="ident">attributes</span>)<span class="op">*</span>
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">non_camel_case_types</span>)]</span>
<span class="kw">pub</span> #<span class="ident">fn_token</span> #<span class="ident">fn_name</span> #<span class="ident">impl_generics</span> (#(#<span class="ident">args_iter</span>,)<span class="kw-2">*</span>)
-> #<span class="ident">fn_name::HelperType</span> #<span class="ident">ty_generics</span>
#<span class="ident">where_clause</span>
#(#<span class="ident">arg_name</span>: <span class="ident">::diesel::expression::AsExpression</span><span class="op"><</span>#<span class="ident">arg_type</span><span class="op">></span>,)<span class="op">*</span>
{
#<span class="ident">fn_name</span>::#<span class="ident">fn_name</span> {
#(#<span class="ident">arg_struct_assign</span>,)<span class="op">*</span>
#(#<span class="ident">type_args</span>: <span class="ident">::std::marker::PhantomData</span>,)<span class="op">*</span>
}
}
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">non_camel_case_types</span>, <span class="ident">non_snake_case</span>, <span class="ident">unused_imports</span>)]</span>
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">mod</span> #<span class="ident">fn_name</span> {
#<span class="ident">tokens</span>
}
}
}
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct</span> <span class="ident">SqlFunctionDecl</span> {
<span class="ident">attributes</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">Attribute</span><span class="op">></span>,
<span class="ident">fn_token</span>: <span class="macro">Token!</span>[<span class="kw">fn</span>],
<span class="ident">fn_name</span>: <span class="ident">Ident</span>,
<span class="ident">generics</span>: <span class="ident">Generics</span>,
<span class="ident">args</span>: <span class="ident">Punctuated</span><span class="op"><</span><span class="ident">StrictFnArg</span>, <span class="macro">Token!</span>[,]<span class="op">></span>,
<span class="ident">return_type</span>: <span class="ident">Type</span>,
}
<span class="kw">impl</span> <span class="ident">Parse</span> <span class="kw">for</span> <span class="ident">SqlFunctionDecl</span> {
<span class="kw">fn</span> <span class="ident">parse</span>(<span class="ident">input</span>: <span class="ident">ParseStream</span>) -> <span class="prelude-ty">Result</span><span class="op"><</span><span class="self">Self</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">attributes</span> <span class="op">=</span> <span class="ident">Attribute::parse_outer</span>(<span class="ident">input</span>)<span class="question-mark">?</span>;
<span class="kw">let</span> <span class="ident">fn_token</span>: <span class="macro">Token!</span>[<span class="kw">fn</span>] <span class="op">=</span> <span class="ident">input</span>.<span class="ident">parse</span>()<span class="question-mark">?</span>;
<span class="kw">let</span> <span class="ident">fn_name</span> <span class="op">=</span> <span class="ident">Ident::parse</span>(<span class="ident">input</span>)<span class="question-mark">?</span>;
<span class="kw">let</span> <span class="ident">generics</span> <span class="op">=</span> <span class="ident">Generics::parse</span>(<span class="ident">input</span>)<span class="question-mark">?</span>;
<span class="kw">let</span> <span class="ident">args</span>;
<span class="kw">let</span> <span class="ident">_paren</span> <span class="op">=</span> <span class="macro">parenthesized!</span>(<span class="ident">args</span> <span class="kw">in</span> <span class="ident">input</span>);
<span class="kw">let</span> <span class="ident">args</span> <span class="op">=</span> <span class="ident">args</span>.<span class="ident">parse_terminated</span>::<span class="op"><</span><span class="kw">_</span>, <span class="macro">Token!</span>[,]<span class="op">></span>(<span class="ident">StrictFnArg::parse</span>)<span class="question-mark">?</span>;
<span class="kw">let</span> <span class="ident">return_type</span> <span class="op">=</span> <span class="kw">if</span> <span class="prelude-ty">Option</span>::<span class="op"><</span><span class="macro">Token!</span>[->]<span class="op">></span><span class="ident">::parse</span>(<span class="ident">input</span>)<span class="question-mark">?</span>.<span class="ident">is_some</span>() {
<span class="ident">Type::parse</span>(<span class="ident">input</span>)<span class="question-mark">?</span>
} <span class="kw">else</span> {
<span class="macro">parse_quote!</span>(<span class="ident">diesel::expression::expression_types::NotSelectable</span>)
};
<span class="kw">let</span> <span class="ident">_semi</span> <span class="op">=</span> <span class="prelude-ty">Option</span>::<span class="op"><</span><span class="macro">Token!</span>[;]<span class="op">></span><span class="ident">::parse</span>(<span class="ident">input</span>)<span class="question-mark">?</span>;
<span class="prelude-val">Ok</span>(<span class="self">Self</span> {
<span class="ident">attributes</span>,
<span class="ident">fn_token</span>,
<span class="ident">fn_name</span>,
<span class="ident">generics</span>,
<span class="ident">args</span>,
<span class="ident">return_type</span>,
})
}
}
<span class="doccomment">/// Essentially the same as ArgCaptured, but only allowing ident patterns</span>
<span class="kw">struct</span> <span class="ident">StrictFnArg</span> {
<span class="ident">name</span>: <span class="ident">Ident</span>,
<span class="ident">colon_token</span>: <span class="macro">Token!</span>[:],
<span class="ident">ty</span>: <span class="ident">Type</span>,
}
<span class="kw">impl</span> <span class="ident">Parse</span> <span class="kw">for</span> <span class="ident">StrictFnArg</span> {
<span class="kw">fn</span> <span class="ident">parse</span>(<span class="ident">input</span>: <span class="ident">ParseStream</span>) -> <span class="prelude-ty">Result</span><span class="op"><</span><span class="self">Self</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">name</span> <span class="op">=</span> <span class="ident">input</span>.<span class="ident">parse</span>()<span class="question-mark">?</span>;
<span class="kw">let</span> <span class="ident">colon_token</span> <span class="op">=</span> <span class="ident">input</span>.<span class="ident">parse</span>()<span class="question-mark">?</span>;
<span class="kw">let</span> <span class="ident">ty</span> <span class="op">=</span> <span class="ident">input</span>.<span class="ident">parse</span>()<span class="question-mark">?</span>;
<span class="prelude-val">Ok</span>(<span class="self">Self</span> {
<span class="ident">name</span>,
<span class="ident">colon_token</span>,
<span class="ident">ty</span>,
})
}
}
<span class="kw">impl</span> <span class="ident">ToTokens</span> <span class="kw">for</span> <span class="ident">StrictFnArg</span> {
<span class="kw">fn</span> <span class="ident">to_tokens</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">tokens</span>: <span class="kw-2">&mut</span> <span class="ident">TokenStream</span>) {
<span class="self">self</span>.<span class="ident">name</span>.<span class="ident">to_tokens</span>(<span class="ident">tokens</span>);
<span class="self">self</span>.<span class="ident">colon_token</span>.<span class="ident">to_tokens</span>(<span class="ident">tokens</span>);
<span class="self">self</span>.<span class="ident">name</span>.<span class="ident">to_tokens</span>(<span class="ident">tokens</span>);