move Element to stanza and make write() a method

1 files changed, 120 insertions, 0 deletions

diff --git a/src/stanza/mod.rs b/src/stanza/mod.rs
index 02ea277..16f3bdd 100644
--- a/src/stanza/mod.rs
+++ b/src/stanza/mod.rs
@@ -4,3 +4,123 @@ pub mod sasl;
 pub mod stream;
 
 // const DECLARATION: BytesDecl<'_> = BytesDecl::new("1.0", None, None);
+use async_recursion::async_recursion;
+use quick_xml::events::Event;
+use quick_xml::{Reader, Writer};
+use tokio::io::{AsyncBufRead, AsyncWrite};
+
+use crate::Result;
+
+#[derive(Debug)]
+pub struct Element<'e> {
+    pub event: Event<'e>,
+    pub content: Option<Vec<Element<'e>>>,
+}
+
+impl<'e: 'async_recursion, 'async_recursion> Element<'e> {
+    pub fn write<'life0, W: AsyncWrite + Unpin + Send>(
+        &'async_recursion self,
+        writer: &'life0 mut Writer<W>,
+    ) -> ::core::pin::Pin<
+        Box<
+            dyn ::core::future::Future<Output = Result<()>>
+                + 'async_recursion
+                + ::core::marker::Send,
+        >,
+    >
+    where
+        W: 'async_recursion,
+        'life0: 'async_recursion,
+    {
+        Box::pin(async move {
+            match &self.event {
+                Event::Start(e) => {
+                    writer.write_event_async(Event::Start(e.clone())).await?;
+                    if let Some(content) = &self.content {
+                        for _e in content {
+                            self.write(writer).await?;
+                        }
+                    }
+                    writer.write_event_async(Event::End(e.to_end())).await?;
+                    return Ok(());
+                }
+                e => Ok(writer.write_event_async(e).await?),
+            }
+        })
+    }
+}
+
+impl<'e> Element<'e> {
+    pub async fn write_start<W: AsyncWrite + Unpin + Send>(
+        &self,
+        writer: &mut Writer<W>,
+    ) -> Result<()> {
+        match self.event.as_ref() {
+            Event::Start(e) => Ok(writer.write_event_async(Event::Start(e.clone())).await?),
+            e => Err(ElementError::NotAStart(e.clone().into_owned()).into()),
+        }
+    }
+
+    pub async fn write_end<W: AsyncWrite + Unpin + Send>(
+        &self,
+        writer: &mut Writer<W>,
+    ) -> Result<()> {
+        match self.event.as_ref() {
+            Event::Start(e) => Ok(writer
+                .write_event_async(Event::End(e.clone().to_end()))
+                .await?),
+            e => Err(ElementError::NotAStart(e.clone().into_owned()).into()),
+        }
+    }
+
+    #[async_recursion]
+    pub async fn read<R: AsyncBufRead + Unpin + Send>(
+        reader: &mut Reader<R>,
+    ) -> Result<Option<Self>> {
+        let mut buf = Vec::new();
+        let event = reader.read_event_into_async(&mut buf).await?;
+        match event {
+            Event::Start(e) => {
+                let mut content_vec = Vec::new();
+                while let Some(sub_element) = Element::read(reader).await? {
+                    content_vec.push(sub_element)
+                }
+                let mut content = None;
+                if !content_vec.is_empty() {
+                    content = Some(content_vec)
+                }
+                Ok(Some(Self {
+                    event: Event::Start(e.into_owned()),
+                    content,
+                }))
+            }
+            Event::End(_) => Ok(None),
+            e => Ok(Some(Self {
+                event: e.into_owned(),
+                content: None,
+            })),
+        }
+    }
+
+    #[async_recursion]
+    pub async fn read_start<R: AsyncBufRead + Unpin + Send>(
+        reader: &mut Reader<R>,
+    ) -> Result<Self> {
+        let mut buf = Vec::new();
+        let event = reader.read_event_into_async(&mut buf).await?;
+        match event {
+            Event::Start(e) => {
+                return Ok(Self {
+                    event: Event::Start(e.into_owned()),
+                    content: None,
+                })
+            }
+            e => Err(ElementError::NotAStart(e.into_owned()).into()),
+        }
+    }
+}
+
+#[derive(Debug)]
+pub enum ElementError<'e> {
+    NotAStart(Event<'e>),
+}