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
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182

use std::{borrow::Cow, convert::TryFrom};

use bstr::BStr;

use crate::{file::MetadataFilter, value, File};

/// Comfortable API for accessing values
impl<'event> File<'event> {
    /// Like [`value()`][File::value()], but returning `None` if the string wasn't found.
    ///
    /// As strings perform no conversions, this will never fail.
    pub fn string(
        &self,
        section_name: impl AsRef<str>,
        subsection_name: Option<&str>,
        key: impl AsRef<str>,
    ) -> Option<Cow<'_, BStr>> {
        self.string_filter(section_name, subsection_name, key, &mut |_| true)
    }

    /// Like [`string()`][File::string()], but the section containing the returned value must pass `filter` as well.
    pub fn string_filter(
        &self,
        section_name: impl AsRef<str>,
        subsection_name: Option<&str>,
        key: impl AsRef<str>,
        filter: &mut MetadataFilter,
    ) -> Option<Cow<'_, BStr>> {
        self.raw_value_filter(section_name, subsection_name, key, filter).ok()
    }

    /// Like [`value()`][File::value()], but returning `None` if the path wasn't found.
    ///
    /// Note that this path is not vetted and should only point to resources which can't be used
    /// to pose a security risk. Prefer using [`path_filter()`][File::path_filter()] instead.
    ///
    /// As paths perform no conversions, this will never fail.
    pub fn path(
        &self,
        section_name: impl AsRef<str>,
        subsection_name: Option<&str>,
        key: impl AsRef<str>,
    ) -> Option<crate::Path<'_>> {
        self.path_filter(section_name, subsection_name, key, &mut |_| true)
    }

    /// Like [`path()`][File::path()], but the section containing the returned value must pass `filter` as well.
    ///
    /// This should be the preferred way of accessing paths as those from untrusted
    /// locations can be
    ///
    /// As paths perform no conversions, this will never fail.
    pub fn path_filter(
        &self,
        section_name: impl AsRef<str>,
        subsection_name: Option<&str>,
        key: impl AsRef<str>,
        filter: &mut MetadataFilter,
    ) -> Option<crate::Path<'_>> {
        self.raw_value_filter(section_name, subsection_name, key, filter)
            .ok()
            .map(crate::Path::from)
    }

    /// Like [`value()`][File::value()], but returning `None` if the boolean value wasn't found.
    pub fn boolean(
        &self,
        section_name: impl AsRef<str>,
        subsection_name: Option<&str>,
        key: impl AsRef<str>,
    ) -> Option<Result<bool, value::Error>> {
        self.boolean_filter(section_name, subsection_name, key, &mut |_| true)
    }

    /// Like [`boolean()`][File::boolean()], but the section containing the returned value must pass `filter` as well.
    pub fn boolean_filter(
        &self,
        section_name: impl AsRef<str>,
        subsection_name: Option<&str>,
        key: impl AsRef<str>,
        filter: &mut MetadataFilter,
    ) -> Option<Result<bool, value::Error>> {
        let section_name = section_name.as_ref();
        let section_ids = self
            .section_ids_by_name_and_subname(section_name, subsection_name)
            .ok()?;
        let key = key.as_ref();
        for section_id in section_ids.rev() {
            let section = self.sections.get(&section_id).expect("known section id");
            if !filter(section.meta()) {
                continue;
            }
            match section.value_implicit(key) {
                Some(Some(v)) => return Some(crate::Boolean::try_from(v).map(|b| b.into())),
                Some(None) => return Some(Ok(true)),
                None => continue,
            }
        }
        None
    }

    /// Like [`value()`][File::value()], but returning an `Option` if the integer wasn't found.
    pub fn integer(
        &self,
        section_name: impl AsRef<str>,
        subsection_name: Option<&str>,
        key: impl AsRef<str>,
    ) -> Option<Result<i64, value::Error>> {
        self.integer_filter(section_name, subsection_name, key, &mut |_| true)
    }

    /// Like [`integer()`][File::integer()], but the section containing the returned value must pass `filter` as well.
    pub fn integer_filter(
        &self,
        section_name: impl AsRef<str>,
        subsection_name: Option<&str>,
        key: impl AsRef<str>,
        filter: &mut MetadataFilter,
    ) -> Option<Result<i64, value::Error>> {
        let int = self.raw_value_filter(section_name, subsection_name, key, filter).ok()?;
        Some(crate::Integer::try_from(int.as_ref()).and_then(|b| {
            b.to_decimal()
                .ok_or_else(|| value::Error::new("Integer overflow", int.into_owned()))
        }))
    }

    /// Similar to [`values(…)`][File::values()] but returning strings if at least one of them was found.
    pub fn strings(
        &self,
        section_name: impl AsRef<str>,
        subsection_name: Option<&str>,
        key: impl AsRef<str>,
    ) -> Option<Vec<Cow<'_, BStr>>> {
        self.raw_values(section_name, subsection_name, key).ok()
    }

    /// Similar to [`strings(…)`][File::strings()], but all values are in sections that passed `filter`.
    pub fn strings_filter(
        &self,
        section_name: impl AsRef<str>,
        subsection_name: Option<&str>,
        key: impl AsRef<str>,
        filter: &mut MetadataFilter,
    ) -> Option<Vec<Cow<'_, BStr>>> {
        self.raw_values_filter(section_name, subsection_name, key, filter).ok()
    }

    /// Similar to [`values(…)`][File::values()] but returning integers if at least one of them was found
    /// and if none of them overflows.
    pub fn integers(
        &self,
        section_name: impl AsRef<str>,
        subsection_name: Option<&str>,
        key: impl AsRef<str>,
    ) -> Option<Result<Vec<i64>, value::Error>> {
        self.integers_filter(section_name, subsection_name, key, &mut |_| true)
    }

    /// Similar to [`integers(…)`][File::integers()] but all integers are in sections that passed `filter`
    /// and that are not overflowing.
    pub fn integers_filter(
        &self,
        section_name: impl AsRef<str>,
        subsection_name: Option<&str>,
        key: impl AsRef<str>,
        filter: &mut MetadataFilter,
    ) -> Option<Result<Vec<i64>, value::Error>> {
        self.raw_values_filter(section_name, subsection_name, key, filter)
            .ok()
            .map(|values| {
                values
                    .into_iter()
                    .map(|v| {
                        crate::Integer::try_from(v.as_ref()).and_then(|int| {
                            int.to_decimal()
                                .ok_or_else(|| value::Error::new("Integer overflow", v.into_owned()))
                        })
                    })
                    .collect()
            })
    }
}