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Better error handling added to walkable

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This commit is contained in:
Tom Alexander 2020-04-12 20:52:30 -04:00
parent a647ed6d43
commit 9c7883358a
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GPG Key ID: D3A179C9A53C0EDE
2 changed files with 39 additions and 21 deletions
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35
src/bin.rs
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@ -88,19 +88,32 @@ impl Renderable for serde_json::Value {
impl Walkable for serde_json::Value {
fn walk(&self, segment: &str) -> Result<&dyn ContextElement, RenderError> {
match self {
serde_json::Value::Null => panic!("Attempted to walk to {} on a null value", segment),
serde_json::Value::Bool(_boolean) => {
panic!("Attempted to walk to {} on a boolean value", segment)
}
serde_json::Value::Number(_num) => {
panic!("Attempted to walk to {} on a number value", segment)
}
serde_json::Value::String(_string) => {
panic!("Attempted to walk to {} on a string value", segment)
}
serde_json::Value::Null => Err(RenderError::CantWalk {
segment: segment.to_string(),
elem: self,
}),
serde_json::Value::Bool(_boolean) => Err(RenderError::CantWalk {
segment: segment.to_string(),
elem: self,
}),
serde_json::Value::Number(_num) => Err(RenderError::CantWalk {
segment: segment.to_string(),
elem: self,
}),
serde_json::Value::String(_string) => Err(RenderError::CantWalk {
segment: segment.to_string(),
elem: self,
}),
serde_json::Value::Array(_arr) => todo!("Arrays not supported yet"),
// TODO: Handle this error better
serde_json::Value::Object(obj) => Ok(obj.get(segment).unwrap()),
serde_json::Value::Object(obj) => {
obj.get(segment)
.map(|val| val as _)
.ok_or(RenderError::WontWalk {
segment: segment.to_string(),
elem: self,
})
}
}
}
}

25
src/renderer/renderer.rs
View File

@ -139,24 +139,29 @@ mod tests {
impl<I: ContextElement> Walkable for HashMap<&str, I> {
fn walk(&self, segment: &str) -> Result<&dyn ContextElement, RenderError> {
Ok(self.get(segment).unwrap())
// TODO: Handle error here better
// self.get(segment).ok_or(RenderError::WontWalk {
// segment: segment.to_string(),
// elem: self,
// })
let child = self.get(segment).ok_or(RenderError::WontWalk {
segment: segment.to_string(),
elem: self,
})?;
Ok(child)
}
}
impl Walkable for &str {
fn walk(&self, _segment: &str) -> Result<&dyn ContextElement, RenderError> {
panic!("Tried to walk down a str");
fn walk(&self, segment: &str) -> Result<&dyn ContextElement, RenderError> {
Err(RenderError::CantWalk {
segment: segment.to_string(),
elem: self,
})
}
}
impl Walkable for u32 {
fn walk(&self, _segment: &str) -> Result<&dyn ContextElement, RenderError> {
panic!("Tried to walk down a str");
fn walk(&self, segment: &str) -> Result<&dyn ContextElement, RenderError> {
Err(RenderError::CantWalk {
segment: segment.to_string(),
elem: self,
})
}
}