docs: add examples

3 files changed, 327 insertions, 0 deletions

diff --git a/examples/data.xml b/examples/data.xml
new file mode 100644
index 0000000..acda261
--- /dev/null
+++ b/examples/data.xml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<data>
+	Hello <something>Foo</something> there
+	<favorites>
+		<food>Icecream</food>
+		<color>Magenta</color>
+	</favorites>
+</data>
diff --git a/examples/simple.rs b/examples/simple.rs
new file mode 100644
index 0000000..a4b76f2
--- /dev/null
+++ b/examples/simple.rs
@@ -0,0 +1,143 @@
+use std::convert::Infallible;
+use std::error::Error;
+use std::fmt::Debug;
+use std::fs::File;
+use std::io::BufReader;
+use std::path::Path;
+
+use xml_stinks::deserializer::buffered::Buffered as BufferedDeserializer;
+use xml_stinks::deserializer::{Deserializer, Error as DeserializerError, IgnoreEnd};
+use xml_stinks::tagged::TagStart;
+use xml_stinks::DeserializeTagged;
+
+const MANIFEST_DIR: &str = std::env!("CARGO_MANIFEST_DIR");
+
+fn main() -> Result<(), Box<dyn Error>>
+{
+    let data_file = Path::new(MANIFEST_DIR).join("examples/data.xml");
+
+    let reader = BufReader::new(File::open(data_file)?);
+
+    let mut deserializer = BufferedDeserializer::new(reader);
+
+    // Skip the <?xml version="1.0" encoding="UTF-8"?>
+    deserializer.skip_to_tag_start("data")?;
+
+    let data = deserializer.de_tag::<Data>("data", IgnoreEnd::No)?;
+
+    println!("The following data was deserialized:\n");
+
+    println!("Greeting: {}", data.greeting);
+    println!("Something: {}", data.something);
+    println!("Favorite food: {}", data.favorites.food);
+    println!("Favorite color: {}", data.favorites.color);
+
+    Ok(())
+}
+
+#[derive(Debug)]
+struct Data
+{
+    greeting: String,
+    something: String,
+    favorites: Favorites,
+}
+
+impl DeserializeTagged for Data
+{
+    type Error = DataError;
+
+    fn deserialize<TDeserializer: Deserializer>(
+        _start: &TagStart,
+        deserializer: &mut TDeserializer,
+    ) -> Result<Self, Self::Error>
+    {
+        let greeting_a = deserializer.de_text()?;
+
+        let something =
+            deserializer.de_tag_with("something", IgnoreEnd::No, |_, deserializer| {
+                deserializer.de_text()
+            })?;
+
+        let greeting_b = deserializer.de_text()?;
+
+        let favorites = deserializer.de_tag::<Favorites>("favorites", IgnoreEnd::No)?;
+
+        Ok(Self {
+            greeting: format!("{greeting_a} {greeting_b}"),
+            something,
+            favorites,
+        })
+    }
+}
+
+#[derive(Debug, thiserror::Error)]
+enum DataError
+{
+    #[error("Invalid favorites")]
+    InvalidFavorites(#[from] FavoritesError),
+
+    #[error(transparent)]
+    DeserializeFailed(#[from] DeserializerError<Infallible>),
+}
+
+impl<DeError: Into<Self>> From<DeserializerError<DeError>> for DataError
+{
+    fn from(err: DeserializerError<DeError>) -> Self
+    {
+        if let DeserializerError::DeserializeFailed(de_err) = err {
+            return de_err.into();
+        }
+
+        err.into_never_de_err().into()
+    }
+}
+
+#[derive(Debug)]
+struct Favorites
+{
+    food: String,
+    color: String,
+}
+
+impl DeserializeTagged for Favorites
+{
+    type Error = FavoritesError;
+
+    fn deserialize<TDeserializer: Deserializer>(
+        _start: &TagStart,
+        deserializer: &mut TDeserializer,
+    ) -> Result<Self, Self::Error>
+    {
+        let food =
+            deserializer.de_tag_with("food", IgnoreEnd::No, |_, deserializer| {
+                deserializer.de_text()
+            })?;
+
+        let color =
+            deserializer.de_tag_with("color", IgnoreEnd::No, |_, deserializer| {
+                deserializer.de_text()
+            })?;
+
+        Ok(Self { food, color })
+    }
+}
+
+#[derive(Debug, thiserror::Error)]
+enum FavoritesError
+{
+    #[error(transparent)]
+    DeserializeFailed(#[from] DeserializerError<Infallible>),
+}
+
+impl<DeError: Into<Self>> From<DeserializerError<DeError>> for FavoritesError
+{
+    fn from(err: DeserializerError<DeError>) -> Self
+    {
+        if let DeserializerError::DeserializeFailed(de_err) = err {
+            return de_err.into();
+        }
+
+        err.into_never_de_err().into()
+    }
+}
diff --git a/examples/testing.rs b/examples/testing.rs
new file mode 100644
index 0000000..3a9d912
--- /dev/null
+++ b/examples/testing.rs
@@ -0,0 +1,176 @@
+use std::convert::Infallible;
+use std::error::Error;
+use std::fmt::Debug;
+
+use xml_stinks::deserializer::buffered::Buffered as BufferedDeserializer;
+use xml_stinks::deserializer::{Deserializer, Error as DeserializerError, IgnoreEnd};
+use xml_stinks::tagged::TagStart;
+use xml_stinks::DeserializeTagged;
+
+fn main() -> Result<(), Box<dyn Error>>
+{
+    let mut deserializer = BufferedDeserializer::new(
+        concat!("<food><name>Banana</name><kind>Fruit</kind></food>",).as_bytes(),
+    );
+
+    let food = deserializer.de_tag::<Food>("food", IgnoreEnd::No)?;
+
+    println!("Food {} with kind {:?}", food.name, food.kind);
+
+    Ok(())
+}
+
+#[derive(Debug)]
+struct Food
+{
+    name: String,
+    kind: FoodKind,
+}
+
+impl DeserializeTagged for Food
+{
+    type Error = FoodError;
+
+    fn deserialize<TDeserializer: Deserializer>(
+        _start: &TagStart,
+        deserializer: &mut TDeserializer,
+    ) -> Result<Self, Self::Error>
+    {
+        let name =
+            deserializer.de_tag_with("name", IgnoreEnd::No, |_, deserializer| {
+                deserializer.de_text()
+            })?;
+
+        let kind =
+            deserializer.de_tag_with("kind", IgnoreEnd::No, |_, deserializer| {
+                match deserializer.de_text()?.as_str() {
+                    "Fruit" => Ok(FoodKind::Fruit),
+                    "Vegetable" => Ok(FoodKind::Vegetable),
+                    unknown_kind => {
+                        Err(FoodError::UnknownFoodKind(unknown_kind.to_string()))
+                    }
+                }
+            })?;
+
+        Ok(Self { name, kind })
+    }
+}
+
+#[derive(Debug)]
+enum FoodKind
+{
+    Fruit,
+    Vegetable,
+}
+
+#[derive(Debug, thiserror::Error)]
+enum FoodError
+{
+    #[error("Unknown food kind '{0}'")]
+    UnknownFoodKind(String),
+
+    #[error(transparent)]
+    DeserializeFailed(#[from] DeserializerError<Infallible>),
+}
+
+impl<DeError: Into<Self>> From<DeserializerError<DeError>> for FoodError
+{
+    fn from(err: DeserializerError<DeError>) -> Self
+    {
+        if let DeserializerError::DeserializeFailed(de_err) = err {
+            return de_err.into();
+        }
+
+        err.into_never_de_err().into()
+    }
+}
+
+#[cfg(test)]
+mod tests
+{
+    use mockall::mock;
+    use mockall::predicate::{always, eq};
+    use xml_stinks::deserializer::{Error, MaybeStatic};
+
+    use super::*;
+
+    mock! {
+        pub Deserializer {}
+
+        impl Deserializer for Deserializer
+        {
+            fn de_tag<De: DeserializeTagged>(
+                &mut self,
+                tag_name: &str,
+                ignore_end: IgnoreEnd,
+            ) -> Result<De, Error<De::Error>>;
+
+            fn de_tag_with<TOutput, Err, Func>(
+                &mut self,
+                tag_name: &str,
+                ignore_end: IgnoreEnd,
+                deserialize: Func,
+            ) -> Result<TOutput, Error<Err>>
+            where
+                TOutput: MaybeStatic,
+                Err: std::error::Error + Send + Sync + 'static,
+                Func: FnOnce(&TagStart, &mut MockDeserializer) -> Result<TOutput, Err> + MaybeStatic;
+
+            fn de_tag_list<De, TagName>(
+                &mut self,
+                tag_name: Option<TagName>
+            ) -> Result<Vec<De>, Error<De::Error>>
+                where
+                    De: DeserializeTagged,
+                    TagName: AsRef<str> + MaybeStatic;
+
+            fn de_text(&mut self) -> Result<String, Error<Infallible>>;
+
+            fn skip_to_tag_start(&mut self, tag_name: &str) -> Result<(), Error<Infallible>>;
+
+            fn skip_to_tag_end(&mut self, tag_name: &str) -> Result<(), Error<Infallible>>;
+        }
+    }
+
+    #[test]
+    fn deserialize_food_works()
+    {
+        let mut mock_deserializer = MockDeserializer::new();
+
+        mock_deserializer
+            .expect_de_tag_with::<String, DeserializerError<Infallible>>()
+            .with(eq("name"), eq(IgnoreEnd::No), always())
+            .returning(|tag_name, _, func| {
+                let mut deserializer = MockDeserializer::new();
+
+                deserializer
+                    .expect_de_text()
+                    .returning(|| Ok("Carrot".to_string()))
+                    .once();
+
+                Ok(func(&TagStart::new(tag_name), &mut deserializer)?)
+            })
+            .once();
+
+        mock_deserializer
+            .expect_de_tag_with::<FoodKind, FoodError>()
+            .with(eq("kind"), eq(IgnoreEnd::No), always())
+            .returning(|tag_name, _, func| {
+                let mut deserializer = MockDeserializer::new();
+
+                deserializer
+                    .expect_de_text()
+                    .returning(|| Ok("Vegetable".to_string()))
+                    .once();
+
+                Ok(func(&TagStart::new(tag_name), &mut deserializer)?)
+            })
+            .once();
+
+        let food = Food::deserialize(&TagStart::new("food"), &mut mock_deserializer)
+            .expect("Expected Ok");
+
+        assert_eq!(food.name, "Carrot");
+        assert!(matches!(food.kind, FoodKind::Vegetable));
+    }
+}