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</pre><pre class="rust ">
<span class="doccomment">//! # log</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Implements a simple output logger.</span>
<span class="doccomment">//!</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span>
<span class="attribute">#[<span class="ident">path</span> <span class="op">=</span> <span class="string">"./log_test.rs"</span>]</span>
<span class="kw">mod</span> <span class="ident">log_test</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">fmt</span>::<span class="ident">Debug</span>;
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">PartialEq</span>)]</span>
<span class="doccomment">/// The log levels</span>
<span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">Level</span> {
<span class="ident">VERBOSE</span>,
<span class="ident">INFO</span>,
<span class="ident">ERROR</span>
}
<span class="kw">fn</span> <span class="ident">get_level</span>(<span class="ident">level_name</span>: <span class="kw-2">&</span><span class="ident">str</span>) <span class="op">-></span> <span class="ident">Level</span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">level</span> <span class="op">=</span> <span class="ident">Level</span>::<span class="ident">INFO</span>;
<span class="kw">if</span> <span class="ident">level_name</span> <span class="op">==</span> <span class="string">"verbose"</span> {
<span class="ident">level</span> <span class="op">=</span> <span class="ident">Level</span>::<span class="ident">VERBOSE</span>;
} <span class="kw">else</span> <span class="kw">if</span> <span class="ident">level_name</span> <span class="op">==</span> <span class="string">"error"</span> {
<span class="ident">level</span> <span class="op">=</span> <span class="ident">Level</span>::<span class="ident">ERROR</span>;
}
<span class="ident">level</span>
}
<span class="kw">fn</span> <span class="ident">print_message</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Debug</span><span class="op">></span>(
<span class="ident">level</span>: <span class="kw-2">&</span><span class="ident">str</span>,
<span class="ident">message</span>: <span class="kw-2">&</span><span class="ident">str</span>,
<span class="ident">args</span>: <span class="kw-2">&</span>[<span class="kw-2">&</span><span class="ident">str</span>],
<span class="ident">obj</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>,
) {
<span class="kw">let</span> <span class="ident">name</span> <span class="op">=</span> <span class="macro">env</span><span class="macro">!</span>(<span class="string">"CARGO_PKG_NAME"</span>);
<span class="macro">print</span><span class="macro">!</span>(<span class="string">"[{}] {} - {}"</span>, <span class="ident">name</span>, <span class="ident">level</span>, <span class="ident">message</span>);
<span class="kw">for</span> <span class="ident">arg</span> <span class="kw">in</span> <span class="ident">args</span> {
<span class="macro">print</span><span class="macro">!</span>(<span class="string">"{}"</span>, <span class="ident">arg</span>);
}
<span class="kw">match</span> <span class="ident">obj</span> {
<span class="prelude-val">Some</span>(<span class="ident">value</span>) <span class="op">=></span> <span class="macro">println</span><span class="macro">!</span>(<span class="string">"{:#?}"</span>, <span class="ident">value</span>),
_ <span class="op">=></span> <span class="macro">print</span><span class="macro">!</span>(<span class="string">"\n"</span>),
}
}
<span class="doccomment">/// A very basic and simple logger used internally</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Logger</span> {
<span class="ident">level</span>: <span class="ident">Level</span>
}
<span class="kw">impl</span> <span class="ident">Logger</span> {
<span class="doccomment">/// Returns true if verbose logging is enabled</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_verbose_enabled</span>(<span class="self">self</span>: <span class="kw-2">&</span><span class="ident">Logger</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="kw">match</span> <span class="self">self</span>.<span class="ident">level</span> {
<span class="ident">Level</span>::<span class="ident">VERBOSE</span> <span class="op">=></span> <span class="bool-val">true</span>,
_ <span class="op">=></span> <span class="bool-val">false</span>,
}
}
<span class="doccomment">/// Returns true if info logging is enabled</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_info_enabled</span>(<span class="self">self</span>: <span class="kw-2">&</span><span class="ident">Logger</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="kw">match</span> <span class="self">self</span>.<span class="ident">level</span> {
<span class="ident">Level</span>::<span class="ident">ERROR</span> <span class="op">=></span> <span class="bool-val">false</span>,
_ <span class="op">=></span> <span class="bool-val">true</span>,
}
}
<span class="doccomment">/// Logs the provided info only if the current log level is verbose</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">verbose</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Debug</span><span class="op">></span>(
<span class="self">self</span>: <span class="kw-2">&</span><span class="ident">Logger</span>,
<span class="ident">message</span>: <span class="kw-2">&</span><span class="ident">str</span>,
<span class="ident">args</span>: <span class="kw-2">&</span>[<span class="kw-2">&</span><span class="ident">str</span>],
<span class="ident">obj</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>,
) {
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">is_verbose_enabled</span>() {
<span class="ident">print_message</span>(<span class="string">"verbose"</span>, <span class="ident">message</span>, <span class="ident">args</span>, <span class="ident">obj</span>);
}
}
<span class="doccomment">/// Logs the provided info only if the current log level is verbose or info</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">info</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Debug</span><span class="op">></span>(
<span class="self">self</span>: <span class="kw-2">&</span><span class="ident">Logger</span>,
<span class="ident">message</span>: <span class="kw-2">&</span><span class="ident">str</span>,
<span class="ident">args</span>: <span class="kw-2">&</span>[<span class="kw-2">&</span><span class="ident">str</span>],
<span class="ident">obj</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>,
) {
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">is_info_enabled</span>() {
<span class="ident">print_message</span>(<span class="string">"info"</span>, <span class="ident">message</span>, <span class="ident">args</span>, <span class="ident">obj</span>);
}
}
<span class="doccomment">/// Logs the provided info and panics</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">error</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Debug</span><span class="op">></span>(
<span class="self">self</span>: <span class="kw-2">&</span><span class="ident">Logger</span>,
<span class="ident">message</span>: <span class="kw-2">&</span><span class="ident">str</span>,
<span class="ident">args</span>: <span class="kw-2">&</span>[<span class="kw-2">&</span><span class="ident">str</span>],
<span class="ident">obj</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>,
) {
<span class="ident">print_message</span>(<span class="string">"error"</span>, <span class="ident">message</span>, <span class="ident">args</span>, <span class="ident">obj</span>);
<span class="macro">panic</span><span class="macro">!</span>(<span class="string">"Build Failed."</span>);
}
}
<span class="doccomment">/// Constructs a new logger and returns it.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Arguments</span>
<span class="doccomment">///</span>
<span class="doccomment">/// * `level_name` - The log level name ('verbose', 'info', 'error')</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">create</span>(<span class="ident">level_name</span>: <span class="kw-2">&</span><span class="ident">str</span>) <span class="op">-></span> <span class="ident">Logger</span> {
<span class="kw">let</span> <span class="ident">level</span> <span class="op">=</span> <span class="ident">get_level</span>(<span class="ident">level_name</span>);
<span class="ident">Logger</span> { <span class="ident">level</span> }
}
</pre>
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