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</pre><pre class="rust ">
<span class="comment">// Copyright 2017 LambdaStack All rights reserved.</span>
<span class="comment">//</span>
<span class="comment">// Licensed under the Apache License, Version 2.0 (the "License");</span>
<span class="comment">// you may not use this file except in compliance with the License.</span>
<span class="comment">// You may obtain a copy of the License at</span>
<span class="comment">//</span>
<span class="comment">// http://www.apache.org/licenses/LICENSE-2.0</span>
<span class="comment">//</span>
<span class="comment">// Unless required by applicable law or agreed to in writing, software</span>
<span class="comment">// distributed under the License is distributed on an "AS IS" BASIS,</span>
<span class="comment">// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span>
<span class="comment">// See the License for the specific language governing permissions and</span>
<span class="comment">// limitations under the License.</span>
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">str</span>;
<span class="kw">use</span> <span class="ident">rustc_serialize</span>::<span class="ident">json</span>::<span class="kw-2">*</span>;
<span class="kw">use</span> <span class="ident">JsonData</span>;
<span class="comment">// use JsonValue;</span>
<span class="doccomment">/// First json call that takes a JSON formatted string and converts it to JsonData object that can</span>
<span class="doccomment">/// then be traversed using `json_find` via the key path.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">json_data</span>(<span class="ident">json_str</span>: <span class="kw-2">&</span><span class="ident">str</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">JsonData</span><span class="op">></span> {
<span class="kw">match</span> <span class="ident">Json</span>::<span class="ident">from_str</span>(<span class="ident">json_str</span>) {
<span class="prelude-val">Ok</span>(<span class="ident">json_data</span>) <span class="op">=></span> {
<span class="prelude-val">Some</span>(<span class="ident">json_data</span>)
},
<span class="prelude-val">Err</span>(_) <span class="op">=></span> {
<span class="prelude-val">None</span>
}
}
}
<span class="doccomment">/// Looks for the parent object first and then the 'child' object. If the parent object is None</span>
<span class="doccomment">/// then it only looks for the 'child' object. The parent object is used for situations where there</span>
<span class="doccomment">/// may be 'child' objects with the same name.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">json_find</span>(<span class="ident">json_data</span>: <span class="ident">JsonData</span>, <span class="ident">keys</span>: <span class="kw-2">&</span>[<span class="kw-2">&</span><span class="ident">str</span>]) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">JsonData</span><span class="op">></span> {
<span class="ident">json_data</span>.<span class="ident">find_path</span>(<span class="ident">keys</span>).<span class="ident">cloned</span>()
}
<span class="doccomment">/// More specific String cast of an individual JsonData object.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">json_as_string</span>(<span class="ident">json_data</span>: <span class="kw-2">&</span><span class="ident">JsonData</span>) <span class="op">-></span> <span class="ident">String</span> {
<span class="ident">json_data</span>.<span class="ident">as_string</span>().<span class="ident">unwrap_or</span>(<span class="string">""</span>).<span class="ident">to_string</span>()
}
</pre>
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