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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="comment">//</span>
<span class="comment">// Portions borrowed from the rusoto project. See README.md</span>
<span class="comment">//</span>
<span class="doccomment">//! Library Documentation</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Tools for handling XML from AWS with helper functions for testing.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Wraps an XML stack via traits.</span>
<span class="doccomment">//! Also provides a method of supplying an XML stack from a file for testing purposes.</span>
<span class="attribute">#<span class="op">!</span>[<span class="ident">allow</span>(<span class="ident">unused_variables</span>)]</span>
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">iter</span>::<span class="ident">Peekable</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">num</span>::<span class="ident">ParseIntError</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">collections</span>::<span class="ident">HashMap</span>;
<span class="kw">use</span> <span class="ident">xml</span>::<span class="ident">reader</span>::{<span class="ident">Events</span>, <span class="ident">XmlEvent</span>};
<span class="kw">use</span> <span class="ident">xml</span>;
<span class="comment">// Helper for pretty output</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">indent</span>(<span class="ident">size</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="ident">String</span> {
<span class="kw">const</span> <span class="ident">INDENT</span>: <span class="kw-2">&</span><span class="lifetime">'static</span> <span class="ident">str</span> <span class="op">=</span> <span class="string">" "</span>;
(<span class="number">0</span>..<span class="ident">size</span>)
.<span class="ident">map</span>(<span class="op">|</span>_<span class="op">|</span> <span class="ident">INDENT</span>)
.<span class="ident">fold</span>(<span class="ident">String</span>::<span class="ident">with_capacity</span>(<span class="ident">size</span> <span class="op">*</span> <span class="ident">INDENT</span>.<span class="ident">len</span>()), <span class="op">|</span><span class="ident">r</span>, <span class="ident">s</span><span class="op">|</span> <span class="ident">r</span> <span class="op">+</span> <span class="ident">s</span>)
}
<span class="comment">// don't use this function</span>
<span class="comment">// pub fn pretty_print_xml(xml_body: &str, skip: bool) {</span>
<span class="comment">// let mut parser = EventReader::from_str(xml_body);</span>
<span class="comment">// let mut depth = 0;</span>
<span class="comment">// let parser_stack = parser.events().peekable();</span>
<span class="comment">// let mut reader = XmlResponse::new(parser_stack);</span>
<span class="comment">//</span>
<span class="comment">// if skip {</span>
<span class="comment">// reader.next();</span>
<span class="comment">// reader.next();</span>
<span class="comment">// }</span>
<span class="comment">//</span>
<span class="comment">// for e in reader.next() {</span>
<span class="comment">// println!("{:?}", e);</span>
<span class="comment">// match e {</span>
<span class="comment">// XmlEvent::StartElement { name, .. } => {</span>
<span class="comment">// println!("{}+{}", indent(depth), name);</span>
<span class="comment">// depth += 1;</span>
<span class="comment">// },</span>
<span class="comment">// XmlEvent::EndElement { name } => {</span>
<span class="comment">// depth -= 1;</span>
<span class="comment">// println!("{}-{}", indent(depth), name);</span>
<span class="comment">// },</span>
<span class="comment">// _ => {</span>
<span class="comment">// println!("Error: {:?}", e);</span>
<span class="comment">// break;</span>
<span class="comment">// },</span>
<span class="comment">// }</span>
<span class="comment">// }</span>
<span class="comment">// }</span>
<span class="doccomment">/// generic Error for XML parsing</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">XmlParseError</span>(<span class="kw">pub</span> <span class="ident">String</span>);
<span class="kw">impl</span> <span class="ident">XmlParseError</span> {
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">msg</span>: <span class="kw-2">&</span><span class="ident">str</span>) <span class="op">-></span> <span class="ident">XmlParseError</span> {
<span class="ident">XmlParseError</span>(<span class="ident">msg</span>.<span class="ident">to_string</span>())
}
}
<span class="doccomment">/// syntactic sugar for the XML event stack we pass around</span>
<span class="kw">pub</span> <span class="kw">type</span> <span class="ident">XmlStack</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="op">=</span> <span class="ident">Peekable</span><span class="op"><</span><span class="ident">Events</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> [<span class="ident">u8</span>]<span class="op">>></span>;
<span class="doccomment">/// Peek at next items in the XML stack</span>
<span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">Peek</span> {
<span class="comment">// fn peek(&mut self) -> Option<&XmlEvent>;</span>
<span class="kw">fn</span> <span class="ident">peek</span>(<span class="kw-2">&</span><span class="kw-2">mut</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="prelude-ty">Result</span><span class="op"><</span><span class="ident">XmlEvent</span>, <span class="ident">xml</span>::<span class="ident">reader</span>::<span class="ident">Error</span><span class="op">>></span>;
}
<span class="doccomment">/// Move to the next part of the XML stack</span>
<span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">Next</span> {
<span class="comment">// fn next(&mut self) -> Option<XmlEvent>;</span>
<span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">XmlEvent</span>, <span class="ident">xml</span>::<span class="ident">reader</span>::<span class="ident">Error</span><span class="op">>></span>;
}
<span class="doccomment">/// Wraps the Hyper Response type for AWS S3. AWS S3 uses XML instead of JSON.</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">XmlResponse</span><span class="op"><</span><span class="lifetime">'b</span><span class="op">></span> {
<span class="ident">xml_stack</span>: <span class="ident">Peekable</span><span class="op"><</span><span class="ident">Events</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'b</span> [<span class="ident">u8</span>]<span class="op">>></span>, <span class="comment">// refactor to use XmlStack type?</span>
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'b</span><span class="op">></span> <span class="ident">XmlResponse</span><span class="op"><</span><span class="lifetime">'b</span><span class="op">></span> {
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">stack</span>: <span class="ident">Peekable</span><span class="op"><</span><span class="ident">Events</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'b</span> [<span class="ident">u8</span>]<span class="op">>></span>) <span class="op">-></span> <span class="ident">XmlResponse</span> {
<span class="ident">XmlResponse</span> { <span class="ident">xml_stack</span>: <span class="ident">stack</span> }
}
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'b</span><span class="op">></span> <span class="ident">Peek</span> <span class="kw">for</span> <span class="ident">XmlResponse</span><span class="op"><</span><span class="lifetime">'b</span><span class="op">></span> {
<span class="comment">// fn peek(&mut self) -> Option<&XmlEvent> {</span>
<span class="comment">// loop {</span>
<span class="comment">// match self.xml_stack.peek() {</span>
<span class="comment">// Some(&XmlEvent::Whitespace(_)) => {},</span>
<span class="comment">// _ => break,</span>
<span class="comment">// }</span>
<span class="comment">// self.xml_stack.next();</span>
<span class="comment">// }</span>
<span class="comment">// self.xml_stack.peek()</span>
<span class="comment">// }</span>
<span class="kw">fn</span> <span class="ident">peek</span>(<span class="kw-2">&</span><span class="kw-2">mut</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="prelude-ty">Result</span><span class="op"><</span><span class="ident">XmlEvent</span>, <span class="ident">xml</span>::<span class="ident">reader</span>::<span class="ident">Error</span><span class="op">>></span> {
<span class="kw">while</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="prelude-val">Ok</span>(<span class="ident">XmlEvent</span>::<span class="ident">Whitespace</span>(_))) <span class="op">=</span> <span class="self">self</span>.<span class="ident">xml_stack</span>.<span class="ident">peek</span>() {
<span class="self">self</span>.<span class="ident">xml_stack</span>.<span class="ident">next</span>();
}
<span class="self">self</span>.<span class="ident">xml_stack</span>.<span class="ident">peek</span>()
}
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'b</span><span class="op">></span> <span class="ident">Next</span> <span class="kw">for</span> <span class="ident">XmlResponse</span><span class="op"><</span><span class="lifetime">'b</span><span class="op">></span> {
<span class="comment">// fn next(&mut self) -> Option<XmlEvent> {</span>
<span class="comment">// let mut maybe_event;</span>
<span class="comment">// loop {</span>
<span class="comment">// maybe_event = self.xml_stack.next();</span>
<span class="comment">// match maybe_event {</span>
<span class="comment">// Some(XmlEvent::Whitespace(_)) => {},</span>
<span class="comment">// _ => break,</span>
<span class="comment">// }</span>
<span class="comment">// }</span>
<span class="comment">// maybe_event</span>
<span class="comment">// }</span>
<span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">XmlEvent</span>, <span class="ident">xml</span>::<span class="ident">reader</span>::<span class="ident">Error</span><span class="op">>></span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">maybe_event</span>;
<span class="kw">loop</span> {
<span class="ident">maybe_event</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">xml_stack</span>.<span class="ident">next</span>();
<span class="kw">match</span> <span class="ident">maybe_event</span> {
<span class="prelude-val">Some</span>(<span class="prelude-val">Ok</span>(<span class="ident">XmlEvent</span>::<span class="ident">Whitespace</span>(_))) <span class="op">=></span> {}
_ <span class="op">=></span> <span class="kw">break</span>,
}
}
<span class="ident">maybe_event</span>
}
}
<span class="kw">impl</span> <span class="ident">From</span><span class="op"><</span><span class="ident">ParseIntError</span><span class="op">></span> <span class="kw">for</span> <span class="ident">XmlParseError</span> {
<span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">_e</span>: <span class="ident">ParseIntError</span>) <span class="op">-></span> <span class="ident">XmlParseError</span> {
<span class="ident">XmlParseError</span>::<span class="ident">new</span>(<span class="string">"ParseIntError"</span>)
}
}
<span class="doccomment">/// parse Some(String) if the next tag has the right name, otherwise None</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">optional_string_field</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Peek</span> <span class="op">+</span> <span class="ident">Next</span><span class="op">></span>(<span class="ident">field_name</span>: <span class="kw-2">&</span><span class="ident">str</span>, <span class="ident">stack</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">T</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">String</span><span class="op">></span>, <span class="ident">XmlParseError</span><span class="op">></span> {
<span class="kw">if</span> <span class="macro">try</span><span class="macro">!</span>(<span class="ident">peek_at_name</span>(<span class="ident">stack</span>)) <span class="op">==</span> <span class="ident">field_name</span> {
<span class="kw">let</span> <span class="ident">val</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="ident">string_field</span>(<span class="ident">field_name</span>, <span class="ident">stack</span>));
<span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(<span class="ident">val</span>))
} <span class="kw">else</span> {
<span class="prelude-val">Ok</span>(<span class="prelude-val">None</span>)
}
}
<span class="doccomment">/// return a string field with the right name or throw a parse error</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">string_field</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Peek</span> <span class="op">+</span> <span class="ident">Next</span><span class="op">></span>(<span class="ident">name</span>: <span class="kw-2">&</span><span class="ident">str</span>, <span class="ident">stack</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">T</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">String</span>, <span class="ident">XmlParseError</span><span class="op">></span> {
<span class="macro">try</span><span class="macro">!</span>(<span class="ident">start_element</span>(<span class="ident">name</span>, <span class="ident">stack</span>));
<span class="kw">let</span> <span class="ident">value</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="ident">characters</span>(<span class="ident">stack</span>));
<span class="macro">try</span><span class="macro">!</span>(<span class="ident">end_element</span>(<span class="ident">name</span>, <span class="ident">stack</span>));
<span class="prelude-val">Ok</span>(<span class="ident">value</span>)
}
<span class="doccomment">/// return some XML Characters</span>
<span class="comment">// pub fn characters<T: Peek + Next>(stack: &mut T) -> Result<String, XmlParseError> {</span>
<span class="comment">// let is_end = peek_is_end_element(stack);</span>
<span class="comment">// if is_end.unwrap() {</span>
<span class="comment">// return Ok("".to_string());</span>
<span class="comment">// }</span>
<span class="comment">//</span>
<span class="comment">// if let Some(XmlEvent::Characters(data)) = stack.next() {</span>
<span class="comment">// Ok(data.to_string())</span>
<span class="comment">// } else {</span>
<span class="comment">// Err(XmlParseError::new("Expected characters"))</span>
<span class="comment">// }</span>
<span class="comment">// }</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">characters</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Peek</span> <span class="op">+</span> <span class="ident">Next</span><span class="op">></span>(<span class="ident">stack</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">T</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">String</span>, <span class="ident">XmlParseError</span><span class="op">></span> {
{
<span class="comment">// Lexical lifetime</span>
<span class="comment">// Check to see if the next element is an end tag.</span>
<span class="comment">// If it is, return an empty string.</span>
<span class="kw">let</span> <span class="ident">current</span> <span class="op">=</span> <span class="ident">stack</span>.<span class="ident">peek</span>();
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="prelude-val">Ok</span>(<span class="ident">XmlEvent</span>::<span class="ident">EndElement</span> { .. })) <span class="op">=</span> <span class="ident">current</span> {
<span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="string">""</span>.<span class="ident">to_string</span>());
}
}
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="prelude-val">Ok</span>(<span class="ident">XmlEvent</span>::<span class="ident">Characters</span>(<span class="ident">data</span>))) <span class="op">=</span> <span class="ident">stack</span>.<span class="ident">next</span>() {
<span class="prelude-val">Ok</span>(<span class="ident">data</span>.<span class="ident">to_string</span>())
} <span class="kw">else</span> {
<span class="prelude-val">Err</span>(<span class="ident">XmlParseError</span>::<span class="ident">new</span>(<span class="string">"Expected characters"</span>))
}
}
<span class="doccomment">/// takes a peek to see if the next element is the end_element</span>
<span class="comment">// pub fn peek_is_end_element<T: Peek + Next>(stack: &mut T) -> Result<bool, XmlParseError> {</span>
<span class="comment">// let current = stack.peek();</span>
<span class="comment">// if let Some(&XmlEvent::EndElement { ref name, .. }) = current {</span>
<span class="comment">// Ok(true)</span>
<span class="comment">// } else {</span>
<span class="comment">// Ok(false)</span>
<span class="comment">// }</span>
<span class="comment">// }</span>
<span class="doccomment">/// get the name of the current element in the stack. throw a parse error if it's not a `StartElement`</span>
<span class="comment">// pub fn peek_at_name<T: Peek + Next>(stack: &mut T) -> Result<String, XmlParseError> {</span>
<span class="comment">// let current = stack.peek();</span>
<span class="comment">// if let Some(&XmlEvent::StartElement { ref name, .. }) = current {</span>
<span class="comment">// Ok(name.local_name.to_string())</span>
<span class="comment">// } else {</span>
<span class="comment">// Ok("".to_string())</span>
<span class="comment">// }</span>
<span class="comment">// }</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">peek_at_name</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Peek</span> <span class="op">+</span> <span class="ident">Next</span><span class="op">></span>(<span class="ident">stack</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">T</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">String</span>, <span class="ident">XmlParseError</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">current</span> <span class="op">=</span> <span class="ident">stack</span>.<span class="ident">peek</span>();
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="prelude-val">Ok</span>(<span class="ident">XmlEvent</span>::<span class="ident">StartElement</span> { <span class="kw-2">ref</span> <span class="ident">name</span>, .. })) <span class="op">=</span> <span class="ident">current</span> {
<span class="prelude-val">Ok</span>(<span class="ident">name</span>.<span class="ident">local_name</span>.<span class="ident">to_string</span>())
} <span class="kw">else</span> {
<span class="prelude-val">Ok</span>(<span class="string">""</span>.<span class="ident">to_string</span>())
}
}
<span class="doccomment">/// consume a `StartElement` with a specific name or throw an `XmlParseError`</span>
<span class="comment">// pub fn start_element<T: Peek + Next>(element_name: &str,</span>
<span class="comment">// stack: &mut T)</span>
<span class="comment">// -> Result<HashMap<String, String>, XmlParseError> {</span>
<span class="comment">// let next = stack.next();</span>
<span class="comment">//</span>
<span class="comment">// if let Some(XmlEvent::StartElement { name, attributes, .. }) = next {</span>
<span class="comment">// if name.local_name == element_name {</span>
<span class="comment">// let mut attr_map = HashMap::new();</span>
<span class="comment">// for attr in attributes {</span>
<span class="comment">// attr_map.insert(attr.name.local_name, attr.value);</span>
<span class="comment">// }</span>
<span class="comment">// Ok(attr_map)</span>
<span class="comment">// } else {</span>
<span class="comment">// Err(XmlParseError::new(&format!("START Expected {} got {}", element_name, name.local_name)))</span>
<span class="comment">// }</span>
<span class="comment">// } else {</span>
<span class="comment">// Err(XmlParseError::new(&format!("Expected StartElement {}", element_name)))</span>
<span class="comment">// }</span>
<span class="comment">// }</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">start_element</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Peek</span> <span class="op">+</span> <span class="ident">Next</span><span class="op">></span>(<span class="ident">element_name</span>: <span class="kw-2">&</span><span class="ident">str</span>,
<span class="ident">stack</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">T</span>)
<span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">HashMap</span><span class="op"><</span><span class="ident">String</span>, <span class="ident">String</span><span class="op">></span>, <span class="ident">XmlParseError</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">next</span> <span class="op">=</span> <span class="ident">stack</span>.<span class="ident">next</span>();
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="prelude-val">Ok</span>(<span class="ident">XmlEvent</span>::<span class="ident">StartElement</span> { <span class="ident">name</span>, <span class="ident">attributes</span>, .. })) <span class="op">=</span> <span class="ident">next</span> {
<span class="kw">if</span> <span class="ident">name</span>.<span class="ident">local_name</span> <span class="op">==</span> <span class="ident">element_name</span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">attr_map</span> <span class="op">=</span> <span class="ident">HashMap</span>::<span class="ident">new</span>();
<span class="kw">for</span> <span class="ident">attr</span> <span class="kw">in</span> <span class="ident">attributes</span> {
<span class="ident">attr_map</span>.<span class="ident">insert</span>(<span class="ident">attr</span>.<span class="ident">name</span>.<span class="ident">local_name</span>, <span class="ident">attr</span>.<span class="ident">value</span>);
}
<span class="prelude-val">Ok</span>(<span class="ident">attr_map</span>)
} <span class="kw">else</span> {
<span class="prelude-val">Err</span>(<span class="ident">XmlParseError</span>::<span class="ident">new</span>(<span class="kw-2">&</span><span class="macro">format</span><span class="macro">!</span>(<span class="string">"START Expected {} got {}"</span>,
<span class="ident">element_name</span>,
<span class="ident">name</span>.<span class="ident">local_name</span>)))
}
} <span class="kw">else</span> {
<span class="prelude-val">Err</span>(<span class="ident">XmlParseError</span>::<span class="ident">new</span>(<span class="kw-2">&</span><span class="macro">format</span><span class="macro">!</span>(<span class="string">"Expected StartElement {} got {:#?}"</span>, <span class="ident">element_name</span>, <span class="ident">next</span>)))
}
}
<span class="doccomment">/// consume an `EndElement` with a specific name or throw an `XmlParseError`</span>
<span class="comment">// pub fn end_element<T: Peek + Next>(element_name: &str, stack: &mut T) -> Result<(), XmlParseError> {</span>
<span class="comment">// let next = stack.next();</span>
<span class="comment">// if let Some(XmlEvent::EndElement { name, .. }) = next {</span>
<span class="comment">// if name.local_name == element_name {</span>
<span class="comment">// Ok(())</span>
<span class="comment">// } else {</span>
<span class="comment">// Err(XmlParseError::new(&format!("END Expected {} got {}", element_name, name.local_name)))</span>
<span class="comment">// }</span>
<span class="comment">// } else {</span>
<span class="comment">// Err(XmlParseError::new(&format!("Expected EndElement {} got {:?}", element_name, next)))</span>
<span class="comment">// }</span>
<span class="comment">// }</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">end_element</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Peek</span> <span class="op">+</span> <span class="ident">Next</span><span class="op">></span>(<span class="ident">element_name</span>: <span class="kw-2">&</span><span class="ident">str</span>, <span class="ident">stack</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">T</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span>(), <span class="ident">XmlParseError</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">next</span> <span class="op">=</span> <span class="ident">stack</span>.<span class="ident">next</span>();
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="prelude-val">Ok</span>(<span class="ident">XmlEvent</span>::<span class="ident">EndElement</span> { <span class="ident">name</span>, .. })) <span class="op">=</span> <span class="ident">next</span> {
<span class="kw">if</span> <span class="ident">name</span>.<span class="ident">local_name</span> <span class="op">==</span> <span class="ident">element_name</span> {
<span class="prelude-val">Ok</span>(())
} <span class="kw">else</span> {
<span class="prelude-val">Err</span>(<span class="ident">XmlParseError</span>::<span class="ident">new</span>(<span class="kw-2">&</span><span class="macro">format</span><span class="macro">!</span>(<span class="string">"END Expected {} got {}"</span>,
<span class="ident">element_name</span>,
<span class="ident">name</span>.<span class="ident">local_name</span>)))
}
} <span class="kw">else</span> {
<span class="prelude-val">Err</span>(<span class="ident">XmlParseError</span>::<span class="ident">new</span>(<span class="kw-2">&</span><span class="macro">format</span><span class="macro">!</span>(<span class="string">"Expected EndElement {} got {:?}"</span>, <span class="ident">element_name</span>, <span class="ident">next</span>)))
}
}
<span class="doccomment">/// consume an `EndElement` with a specific name or throw an `XmlParseError`</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">end_element_skip</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Peek</span> <span class="op">+</span> <span class="ident">Next</span><span class="op">></span>(<span class="ident">element_name</span>: <span class="kw-2">&</span><span class="ident">str</span>, <span class="ident">stack</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">T</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span>(), <span class="ident">XmlParseError</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">next</span> <span class="op">=</span> <span class="ident">stack</span>.<span class="ident">next</span>();
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="prelude-val">Ok</span>(<span class="ident">XmlEvent</span>::<span class="ident">EndElement</span> { <span class="ident">name</span>, .. })) <span class="op">=</span> <span class="ident">next</span> {
<span class="kw">if</span> <span class="ident">name</span>.<span class="ident">local_name</span> <span class="op">==</span> <span class="ident">element_name</span> {
<span class="prelude-val">Ok</span>(())
} <span class="kw">else</span> {
<span class="prelude-val">Err</span>(<span class="ident">XmlParseError</span>::<span class="ident">new</span>(<span class="kw-2">&</span><span class="macro">format</span><span class="macro">!</span>(<span class="string">"END Expected {} got {}"</span>, <span class="ident">element_name</span>, <span class="ident">name</span>.<span class="ident">local_name</span>)))
}
} <span class="kw">else</span> {
<span class="comment">// Err(XmlParseError::new(&format!("Expected EndElement {} got {:?}", element_name, next)))</span>
<span class="comment">// Calling this function means you know it may not be the end (dynamic errors) but you</span>
<span class="comment">// have capture all you want so end it anyway.</span>
<span class="prelude-val">Ok</span>(())
}
}
<span class="doccomment">/// skip a tag and all its children</span>
<span class="comment">// pub fn skip_tree<T: Peek + Next>(stack: &mut T) {</span>
<span class="comment">//</span>
<span class="comment">// let mut deep: usize = 0;</span>
<span class="comment">//</span>
<span class="comment">// loop {</span>
<span class="comment">// match stack.next() {</span>
<span class="comment">// None => break,</span>
<span class="comment">// Some(XmlEvent::StartElement { .. }) => deep += 1,</span>
<span class="comment">// Some(XmlEvent::EndElement { .. }) => {</span>
<span class="comment">// if deep > 1 {</span>
<span class="comment">// deep -= 1;</span>
<span class="comment">// } else {</span>
<span class="comment">// break;</span>
<span class="comment">// }</span>
<span class="comment">// },</span>
<span class="comment">// _ => (),</span>
<span class="comment">// }</span>
<span class="comment">// }</span>
<span class="comment">//</span>
<span class="comment">// }</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">skip_tree</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Peek</span> <span class="op">+</span> <span class="ident">Next</span><span class="op">></span>(<span class="ident">stack</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">T</span>) {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">deep</span>: <span class="ident">usize</span> <span class="op">=</span> <span class="number">0</span>;
<span class="kw">loop</span> {
<span class="kw">match</span> <span class="ident">stack</span>.<span class="ident">next</span>() {
<span class="prelude-val">None</span> <span class="op">=></span> <span class="kw">break</span>,
<span class="prelude-val">Some</span>(<span class="prelude-val">Ok</span>(<span class="ident">XmlEvent</span>::<span class="ident">StartElement</span> { .. })) <span class="op">=></span> <span class="ident">deep</span> <span class="op">+=</span> <span class="number">1</span>,
<span class="prelude-val">Some</span>(<span class="prelude-val">Ok</span>(<span class="ident">XmlEvent</span>::<span class="ident">EndElement</span> { .. })) <span class="op">=></span> {
<span class="kw">if</span> <span class="ident">deep</span> <span class="op">></span> <span class="number">1</span> {
<span class="ident">deep</span> <span class="op">-=</span> <span class="number">1</span>;
} <span class="kw">else</span> {
<span class="kw">break</span>;
}
}
_ <span class="op">=></span> (),
}
}
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span>
<span class="kw">mod</span> <span class="ident">tests</span> {
<span class="kw">use</span> <span class="kw">super</span>::<span class="kw-2">*</span>;
<span class="kw">use</span> <span class="ident">xml</span>::<span class="ident">reader</span>::<span class="kw-2">*</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">io</span>::<span class="ident">Read</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">fs</span>::<span class="ident">File</span>;
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">peek_at_name_happy_path</span>() {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">file</span> <span class="op">=</span> <span class="ident">File</span>::<span class="ident">open</span>(<span class="string">"tests/sample-data/list_queues_with_queue.xml"</span>).<span class="ident">unwrap</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">body</span> <span class="op">=</span> <span class="ident">String</span>::<span class="ident">new</span>();
<span class="kw">let</span> <span class="ident">_size</span> <span class="op">=</span> <span class="ident">file</span>.<span class="ident">read_to_string</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">body</span>);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">my_parser</span> <span class="op">=</span> <span class="ident">EventReader</span>::<span class="ident">new</span>(<span class="ident">body</span>.<span class="ident">as_bytes</span>());
<span class="kw">let</span> <span class="ident">my_stack</span> <span class="op">=</span> <span class="ident">my_parser</span>.<span class="ident">events</span>().<span class="ident">peekable</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">reader</span> <span class="op">=</span> <span class="ident">XmlResponse</span>::<span class="ident">new</span>(<span class="ident">my_stack</span>);
<span class="kw">loop</span> {
<span class="ident">reader</span>.<span class="ident">next</span>();
<span class="kw">match</span> <span class="ident">peek_at_name</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">reader</span>) {
<span class="prelude-val">Ok</span>(<span class="ident">data</span>) <span class="op">=></span> {
<span class="kw">if</span> <span class="ident">data</span> <span class="op">==</span> <span class="string">"QueueUrl"</span> {
<span class="kw">return</span>;
}
},
<span class="prelude-val">Err</span>(_) <span class="op">=></span> <span class="macro">panic</span><span class="macro">!</span>(<span class="string">"Couldn't peek at name"</span>),
}
}
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">start_element_happy_path</span>() {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">file</span> <span class="op">=</span> <span class="ident">File</span>::<span class="ident">open</span>(<span class="string">"tests/sample-data/list_queues_with_queue.xml"</span>).<span class="ident">unwrap</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">body</span> <span class="op">=</span> <span class="ident">String</span>::<span class="ident">new</span>();
<span class="kw">let</span> <span class="ident">_size</span> <span class="op">=</span> <span class="ident">file</span>.<span class="ident">read_to_string</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">body</span>);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">my_parser</span> <span class="op">=</span> <span class="ident">EventReader</span>::<span class="ident">new</span>(<span class="ident">body</span>.<span class="ident">as_bytes</span>());
<span class="kw">let</span> <span class="ident">my_stack</span> <span class="op">=</span> <span class="ident">my_parser</span>.<span class="ident">events</span>().<span class="ident">peekable</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">reader</span> <span class="op">=</span> <span class="ident">XmlResponse</span>::<span class="ident">new</span>(<span class="ident">my_stack</span>);
<span class="comment">// skip two leading fields since we ignore them (xml declaration, return type declaration)</span>
<span class="ident">reader</span>.<span class="ident">next</span>();
<span class="ident">reader</span>.<span class="ident">next</span>();
<span class="kw">match</span> <span class="ident">start_element</span>(<span class="string">"ListQueuesResult"</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">reader</span>) {
<span class="prelude-val">Ok</span>(_) <span class="op">=></span> (),
<span class="prelude-val">Err</span>(_) <span class="op">=></span> <span class="macro">panic</span><span class="macro">!</span>(<span class="string">"Couldn't find start element"</span>),
}
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">string_field_happy_path</span>() {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">file</span> <span class="op">=</span> <span class="ident">File</span>::<span class="ident">open</span>(<span class="string">"tests/sample-data/list_queues_with_queue.xml"</span>).<span class="ident">unwrap</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">body</span> <span class="op">=</span> <span class="ident">String</span>::<span class="ident">new</span>();
<span class="kw">let</span> <span class="ident">_size</span> <span class="op">=</span> <span class="ident">file</span>.<span class="ident">read_to_string</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">body</span>);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">my_parser</span> <span class="op">=</span> <span class="ident">EventReader</span>::<span class="ident">new</span>(<span class="ident">body</span>.<span class="ident">as_bytes</span>());
<span class="kw">let</span> <span class="ident">my_stack</span> <span class="op">=</span> <span class="ident">my_parser</span>.<span class="ident">events</span>().<span class="ident">peekable</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">reader</span> <span class="op">=</span> <span class="ident">XmlResponse</span>::<span class="ident">new</span>(<span class="ident">my_stack</span>);
<span class="comment">// skip two leading fields since we ignore them (xml declaration, return type declaration)</span>
<span class="ident">reader</span>.<span class="ident">next</span>();
<span class="ident">reader</span>.<span class="ident">next</span>();
<span class="ident">reader</span>.<span class="ident">next</span>(); <span class="comment">// reader now at ListQueuesResult</span>
<span class="comment">// now we're set up to use string:</span>
<span class="kw">let</span> <span class="ident">my_chars</span> <span class="op">=</span> <span class="ident">string_field</span>(<span class="string">"QueueUrl"</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">reader</span>).<span class="ident">unwrap</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">my_chars</span>, <span class="string">"https://sqs.us-east-1.amazonaws.com/347452556413/testqueue"</span>)
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">end_element_happy_path</span>() {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">file</span> <span class="op">=</span> <span class="ident">File</span>::<span class="ident">open</span>(<span class="string">"tests/sample-data/list_queues_with_queue.xml"</span>).<span class="ident">unwrap</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">body</span> <span class="op">=</span> <span class="ident">String</span>::<span class="ident">new</span>();
<span class="kw">let</span> <span class="ident">_size</span> <span class="op">=</span> <span class="ident">file</span>.<span class="ident">read_to_string</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">body</span>);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">my_parser</span> <span class="op">=</span> <span class="ident">EventReader</span>::<span class="ident">new</span>(<span class="ident">body</span>.<span class="ident">as_bytes</span>());
<span class="kw">let</span> <span class="ident">my_stack</span> <span class="op">=</span> <span class="ident">my_parser</span>.<span class="ident">events</span>().<span class="ident">peekable</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">reader</span> <span class="op">=</span> <span class="ident">XmlResponse</span>::<span class="ident">new</span>(<span class="ident">my_stack</span>);
<span class="comment">// skip two leading fields since we ignore them (xml declaration, return type declaration)</span>
<span class="ident">reader</span>.<span class="ident">next</span>();
<span class="ident">reader</span>.<span class="ident">next</span>();
<span class="comment">// NOTE: this is fragile and not good: do some looping to find end element?</span>
<span class="comment">// But need to do it without being dependent on peek_at_name.</span>
<span class="ident">reader</span>.<span class="ident">next</span>();
<span class="ident">reader</span>.<span class="ident">next</span>();
<span class="ident">reader</span>.<span class="ident">next</span>();
<span class="ident">reader</span>.<span class="ident">next</span>();
<span class="kw">match</span> <span class="ident">end_element</span>(<span class="string">"ListQueuesResult"</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">reader</span>) {
<span class="prelude-val">Ok</span>(_) <span class="op">=></span> (),
<span class="prelude-val">Err</span>(_) <span class="op">=></span> <span class="macro">panic</span><span class="macro">!</span>(<span class="string">"Couldn't find end element"</span>),
}
}
}
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