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

use uri::Uri;

/// RDF Schema data types and vocabulary.
pub enum RdfSyntaxDataTypes {
  A,
  ListFirst,
  ListRest,
  ListNil
}


impl RdfSyntaxDataTypes {
  /// Returns a specific data type as URI.
  pub fn to_uri(&self) -> Uri {
    Uri::new(self.to_string())
  }

  /// Returns a specific data type as string.
  pub fn to_string(&self) -> String {
    let schema_name = "http://www.w3.org/1999/02/22-rdf-syntax-ns#".to_string();

    match *self {
      RdfSyntaxDataTypes::A => schema_name + "type",
      RdfSyntaxDataTypes::ListFirst => schema_name + "first",
      RdfSyntaxDataTypes::ListRest => schema_name + "rest",
      RdfSyntaxDataTypes::ListNil => schema_name + "nil"
    }
  }
}


/// Contains general RDF specification rules and helpers.
pub struct RdfSyntaxSpecs {}

impl RdfSyntaxSpecs {
  /// Contains characters that need to be escaped when written.
  fn characters_to_be_escaped() -> Vec<char> {
    vec!['\'', '"', '\\']
  }

  /// Replaces all characters with their escaped counterparts.
  pub fn escape_literal(literal: &String) -> String {
    let escaped_literal = literal.clone();

    for c in RdfSyntaxSpecs::characters_to_be_escaped() {
      let mut escaped_char = "\\".to_string();
      escaped_char.push(c);
      escaped_literal.replace(c, &escaped_char);
    }

    escaped_literal
  }
}