parse_env_filter/
eager.rs

1//! Eagerly fully-parsed event filters.
2
3extern crate alloc;
4
5use crate::{FieldFilter, ParseError};
6use alloc::vec::Vec;
7use core::convert::TryFrom;
8
9/// Parse a series of filters out of a directive string.
10///
11/// This is an eager, allocating version of [the root `filters`](crate::filters).
12#[allow(clippy::result_unit_err)]
13pub fn filters(directives: &str) -> Result<Vec<Filter<'_>>, ParseError> {
14    crate::filters(directives)
15        .map(|filter| Filter::try_from(filter?))
16        .collect()
17}
18
19/// A single event filter, `target[span{field=value}]=level`.
20#[derive(Debug, Clone, PartialEq, Eq)]
21pub struct Filter<'a> {
22    pub target: &'a str,
23    pub span: Option<Vec<SpanFilter<'a>>>,
24    pub level: Option<&'a str>,
25}
26
27impl<'a> TryFrom<crate::Filter<'a>> for Filter<'a> {
28    type Error = ParseError;
29
30    fn try_from(filter: crate::Filter<'a>) -> Result<Self, Self::Error> {
31        Ok(Filter {
32            target: filter.target,
33            span: filter
34                .span
35                .map(|filters| {
36                    filters
37                        .map(|filter| SpanFilter::try_from(filter?))
38                        .collect()
39                })
40                .transpose()?,
41            level: filter.level,
42        })
43    }
44}
45
46/// A single span filter, `[span{field=value}]`.
47#[derive(Debug, Clone, PartialEq, Eq)]
48pub struct SpanFilter<'a> {
49    pub name: &'a str,
50    pub fields: Option<Vec<FieldFilter<'a>>>,
51}
52
53impl<'a> TryFrom<crate::SpanFilter<'a>> for SpanFilter<'a> {
54    type Error = ParseError;
55
56    fn try_from(filter: crate::SpanFilter<'a>) -> Result<Self, Self::Error> {
57        Ok(SpanFilter {
58            name: filter.name,
59            fields: filter.fields.map(|filters| filters.collect()).transpose()?,
60        })
61    }
62}
parse_env_filter/eager.rs

parse_env_filter/
eager.rs
