Struct rocket_dyn_templates::minijinja::Error

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pub struct Error { /* private fields */ }
Expand description

Represents template errors.

If debug mode is enabled a template error contains additional debug information that can be displayed by formatting an error with the alternative formatting (format!("{:#}", err)). That information is also shown for the Debug display where the extended information is hidden when the alternative formatting is used.

Since MiniJinja takes advantage of chained errors it’s recommended to render the entire chain to better understand the causes.

§Example

Here is an example of how you might want to render errors:

match template.render(ctx) {
    Ok(result) => println!("{}", result),
    Err(err) => {
        eprintln!("Could not render template: {:#}", err);
        // render causes as well
        let mut err = &err as &dyn std::error::Error;
        while let Some(next_err) = err.source() {
            eprintln!();
            eprintln!("caused by: {:#}", next_err);
            err = next_err;
        }
    }
}

Implementations§

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impl Error

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pub fn new<D>(kind: ErrorKind, detail: D) -> Error
where D: Into<Cow<'static, str>>,

Creates a new error with kind and detail.

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pub fn with_source<E>(self, source: E) -> Error
where E: Error + Send + Sync + 'static,

Attaches another error as source to this error.

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pub fn kind(&self) -> ErrorKind

Returns the error kind

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pub fn detail(&self) -> Option<&str>

Returns the error detail

The detail is an error message that provides further details about the error kind.

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pub fn name(&self) -> Option<&str>

Returns the filename of the template that caused the error.

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pub fn line(&self) -> Option<usize>

Returns the line number where the error occurred.

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pub fn range(&self) -> Option<Range<usize>>

Returns the byte range of where the error occurred if available.

In combination with template_source this can be used to better visualize where the error is coming from. By indexing into the template source one ends up with the source of the failing expression.

Note that debug mode (Environment::set_debug) needs to be enabled, and the debug feature must be turned on. The engine usually keeps track of spans in all cases, but there is no absolute guarantee that it is able to provide a range in all error cases.

let tmpl = env.template_from_str("Hello {{ foo + bar }}!").unwrap();
let err = tmpl.render(context!(foo => "a string", bar => 0)).unwrap_err();
let src = err.template_source().unwrap();
assert_eq!(&src[err.range().unwrap()], "foo + bar");
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pub fn display_debug_info(&self) -> impl Display

Helper function that renders all known debug info on format.

This method returns an object that when formatted prints out the debug information that is contained on that error. Normally this is automatically rendered when the error is displayed but in some cases you might want to decide for yourself when and how to display that information.

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pub fn template_source(&self) -> Option<&str>

Returns the template source if available.

Trait Implementations§

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impl Debug for Error

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fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter. Read more
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impl Display for Error

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fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter. Read more
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impl Error for Error

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fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any. Read more
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fn description(&self) -> &str

👎Deprecated since 1.42.0: use the Display impl or to_string()
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fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0: replaced by Error::source, which can support downcasting
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fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)
Provides type-based access to context intended for error reports. Read more
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impl Error for Error

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fn custom<T>(msg: T) -> Error
where T: Display,

Raised when there is general error when deserializing a type. Read more
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fn invalid_type(unexp: Unexpected<'_>, exp: &dyn Expected) -> Self

Raised when a Deserialize receives a type different from what it was expecting. Read more
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fn invalid_value(unexp: Unexpected<'_>, exp: &dyn Expected) -> Self

Raised when a Deserialize receives a value of the right type but that is wrong for some other reason. Read more
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fn invalid_length(len: usize, exp: &dyn Expected) -> Self

Raised when deserializing a sequence or map and the input data contains too many or too few elements. Read more
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fn unknown_variant(variant: &str, expected: &'static [&'static str]) -> Self

Raised when a Deserialize enum type received a variant with an unrecognized name.
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fn unknown_field(field: &str, expected: &'static [&'static str]) -> Self

Raised when a Deserialize struct type received a field with an unrecognized name.
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fn missing_field(field: &'static str) -> Self

Raised when a Deserialize struct type expected to receive a required field with a particular name but that field was not present in the input.
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fn duplicate_field(field: &'static str) -> Self

Raised when a Deserialize struct type received more than one of the same field.
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impl From<Error> for Error

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fn from(_: Error) -> Error

Converts to this type from the input type.
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impl From<Error> for Value

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fn from(value: Error) -> Value

Converts to this type from the input type.
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impl From<ErrorKind> for Error

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fn from(kind: ErrorKind) -> Error

Converts to this type from the input type.
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impl<'de> IntoDeserializer<'de, Error> for &'de Value

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type Deserializer = &'de Value

The type of the deserializer being converted into.
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fn into_deserializer(self) -> &'de Value

Convert this value into a deserializer.
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impl<'de> IntoDeserializer<'de, Error> for Value

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type Deserializer = Value

The type of the deserializer being converted into.
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fn into_deserializer(self) -> Value

Convert this value into a deserializer.

Auto Trait Implementations§

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impl Freeze for Error

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impl !RefUnwindSafe for Error

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impl Send for Error

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impl Sync for Error

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impl Unpin for Error

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impl !UnwindSafe for Error

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Gets the TypeId of self. Read more
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fn explicit(self, class: Class, tag: u32) -> TaggedParser<'a, Explicit, Self>

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Mutably borrows from an owned value. Read more
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Returns the argument unchanged.

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Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
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Converts self into a collection.
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Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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