xml-canonicalization 0.1.0

XML Canonicalisation Library in pure Rust
Documentation 
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
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118

use pest::{error::Error, Parser};
use pest_derive::Parser;

#[derive(Parser)]
#[grammar = "grammars/character_refs.pest"]
struct CharacterRefParser;

pub enum Situation {
    Attribute,
    Content,
}

pub fn canonicalize_character_references(
    input: &str,
    situation: &Situation,
) -> Result<String, Box<Error<Rule>>> {
    let mut output = String::new();

    let input_string = CharacterRefParser::parse(Rule::InputString, input)?
        .next()
        .unwrap();
    tracing::trace!("input string parsed as: {input_string}");

    for pair in input_string.into_inner() {
        match pair.as_rule() {
            Rule::EOI => break,
            Rule::Character => {
                output.push_str(pair.as_str());
            }
            Rule::CharacterThatMightNeedChanging => match pair.as_str() {
                ">" => match situation {
                    Situation::Attribute => output.push('>'),
                    Situation::Content => output.push_str("&gt;"),
                },
                "\"" => match situation {
                    Situation::Attribute => output.push_str("&quot;"),
                    Situation::Content => output.push('"'),
                },
                "\x0d" => output.push_str("&#xD"),
                "\x09" => match situation {
                    Situation::Attribute => output.push_str("&#x9;"),
                    Situation::Content => output.push('\x09'),
                },
                "\x0a" => match situation {
                    Situation::Attribute => output.push_str("&#xA;"),
                    Situation::Content => output.push('\x0a'),
                },
                _ => unreachable!(),
            },
            Rule::CharacterReference => {
                let inner = pair.into_inner().next().unwrap();
                match inner.as_rule() {
                    Rule::WellKnownRef => match inner.as_str() {
                        "amp" => output.push_str("&amp;"),
                        "lt" => output.push_str("&lt;"),
                        "apos" => output.push('\''),

                        "gt" => match situation {
                            Situation::Attribute => output.push('>'),
                            Situation::Content => output.push_str("&gt;"),
                        },
                        "quot" => match situation {
                            Situation::Attribute => output.push_str("&quot;"),
                            Situation::Content => output.push('"'),
                        },
                        _ => unreachable!(),
                    },
                    Rule::DecimalRef => {
                        let val = inner.as_str();
                        if let Ok(code) = val.parse::<u32>() {
                            match code {
                                0xd => output.push_str("&#xD;"),
                                0xa => match situation {
                                    Situation::Attribute => output.push_str("&#xA;"),
                                    Situation::Content => {
                                        output.push(char::from_u32(code).unwrap());
                                    }
                                },
                                0x9 => match situation {
                                    Situation::Attribute => output.push_str("&#x9;"),
                                    Situation::Content => {
                                        output.push(char::from_u32(code).unwrap());
                                    }
                                },
                                _ => output.push(char::from_u32(code).unwrap()),
                            }
                        }
                    }
                    Rule::HexadecimalRef => {
                        let val = inner.as_str();
                        if let Ok(code) = u32::from_str_radix(val, 16) {
                            match code {
                                0xd => output.push_str("&#xD;"),
                                0xa => match situation {
                                    Situation::Attribute => output.push_str("&#xA;"),
                                    Situation::Content => {
                                        output.push(char::from_u32(code).unwrap());
                                    }
                                },
                                0x9 => match situation {
                                    Situation::Attribute => output.push_str("&#x9;"),
                                    Situation::Content => {
                                        output.push(char::from_u32(code).unwrap());
                                    }
                                },
                                _ => output.push(char::from_u32(code).unwrap()),
                            }
                        }
                    }
                    _ => unreachable!(),
                }
            }
            _ => unreachable!(),
        }
    }

    Ok(output)
}