1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78

#![allow(clippy::module_name_repetitions)]

use crate::error::{Error as IriError, ErrorKind};
use crate::Normalize;
use crate::{parse, ValidateStr};
use std::fmt::{Display, Formatter};
use std::str::FromStr;

// ------------------------------------------------------------------------------------------------
// Public Types
// ------------------------------------------------------------------------------------------------

///
/// The fragment component of an `IRI` contains a fragment identifier providing direction to a
/// secondary resource, such as a section heading in an article identified by the remainder of the
/// URI. When the primary resource is an HTML document, the fragment is often an id attribute of a
/// specific element, and web browsers will scroll this element into view.
///
/// # Example
///
/// ```rust
/// use rdftk_iri::Fragment;
/// use std::str::FromStr;
///
/// let heading = Fragment::from_str("heading-one").unwrap();
/// println!("'{}'", heading); // prints '#heading-one'
/// ```
///
#[derive(Clone, Debug, PartialEq, Eq, Hash)]
pub struct Fragment(String);

// ------------------------------------------------------------------------------------------------
// Implementations
// ------------------------------------------------------------------------------------------------

impl Default for Fragment {
    fn default() -> Self {
        Self(String::default())
    }
}

impl Display for Fragment {
    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
        write!(f, "#{}", self.0)
    }
}

impl FromStr for Fragment {
    type Err = IriError;

    fn from_str(s: &str) -> Result<Self, Self::Err> {
        if Self::is_valid(s) {
            Ok(Self(s.to_string()))
        } else {
            Err(ErrorKind::ParseFragmentError(s.to_string()).into())
        }
    }
}

impl ValidateStr for Fragment {
    fn is_valid(s: &str) -> bool {
        parse::is_ifragment(s)
    }
}

impl Normalize for Fragment {}

impl Fragment {
    /// Return `true` if the fragment is the empty string `""` (which is a legal value), else `false`.
    pub fn is_empty(&self) -> bool {
        self.0.is_empty()
    }

    /// Return the current value of this fragment as a String.
    pub fn value(&self) -> &String {
        &self.0
    }
}