from_str adds extra backslashs

[Kerwood]

When deserializing from XML to a struct, quick-xml adds an extra backslash to backslashes, like its trying to escape them.

So <FolderPath>\Infrastructure\Network</FolderPath> becomes folder_path: "\\Infrastructure\\Network".
Is that a bug or am I missing something ?

[tafia]

Can you provide an example?

[Kerwood]

Sure...

Dependencies

[dependencies]
serde = { version = "1.0", features = [ "derive" ] }
quick-xml = { version = "0.21", features = [ "serialize" ] }
csv = "1.1.6"

Code

extern crate quick_xml;
use quick_xml::de::from_str;
use serde::Deserialize;

#[derive(Debug, Deserialize)]
struct Secret {
    #[serde(rename = "SecretName")]
    secret_name: String,
    #[serde(rename = "FolderPath")]
    folder_path: String,
}

fn main() {
    let xml = r#"<Secret>
            <SecretName>VerySecret</SecretName>
            <FolderPath>\Infrastructure\Network</FolderPath>
        </Secret>"#;

    let result: Secret = from_str(&xml).unwrap();
    println!("{:#?}", result);
}

Result

Secret {
    secret_name: "VerySecret",
    folder_path: "\\Infrastructure\\Network",
}

Expected

Secret {
    secret_name: "VerySecret",
    folder_path: "\Infrastructure\Network",
}

[BlueGreenMagick]

That may be a quirk of debug display and the actual string has one backslash.

For example, run the following code:

#[derive(Debug)]
struct Object {
    name: String
}

fn main() {
    let obj = Object {name: r"\".to_string()};
    println!("{:#?}", obj);
}

output:

Object {
    name: "\\",
}

[tafia]

I didn't see it, this definitely seems the case. Could you try comparing the actual result with r#"\Infrastructure\Network"# ?

[ghost]

Is this also related to escaping happening in attribute values (which must AFAIK be quoted anyway)?

e.g.:
Original element:

<CONSTRAINT
    DESCRIPTION="Time alignable annotations within the parent annotation's time interval, gaps are allowed" 
    STEREOTYPE="Included_In"/>

The above deserialised then serialised (apostrophe in DESCRIPTION escaped as ') :

<CONSTRAINT
    DESCRIPTION="Time alignable annotations within the parent annotation&apos;s time interval, gaps are allowed"     
    STEREOTYPE="Included_In"/>

Expected behaviour would be for this to happen only for (unquoted) element values/text, not attributes. The serialised xml in question does validate in either case however.

[Mingun]

The double slash in the output is the result of using Debug trait to output string, as @BlueGreenMagick noted.

The quoting in the XML attributes is excessive and can be avoided, because standard allows to not escape apostrophe if attribute value in double quotes

[Mingun]

Duplicate of #362