ical-rs 0.2.0

iCalendar parser, validator, editor and builder library for 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

//! # Codec
//!
//! The bytes-to-model bridge, in both directions and at both levels. The only
//! part of [`crate::tree`] that consults the calendar version.
//!
//! [`decode`] projects a raw syntax tree onto the decoded model and [`encode`]
//! projects it back; that is the structural level. Underneath, at the
//! value-string level, [`escape`] and [`unescape`] apply and resolve the RFC
//! 5545 3.3.11 value escapes, keyed by the [`mode`] `Escaper`, and every value
//! leaf the structural codecs touch runs through them. Content transfer
//! encodings (`QUOTED-PRINTABLE`, `BASE64`) and `CHARSET` are never resolved
//! here: the core transforms no content, leaving that to the opt-in feature
//! helpers.
//!
//! The per-value-type projection is the [`Codec`] trait, implemented once per
//! value type under [`crate::tree::value`], mirroring the model's `value/`; both
//! the structural dispatch and the per-property lenses go through it.

use crate::{
    tree::{codec::mode::Escaper, value::node::IcalValueNode},
    value::{IcalUnknownValue, IcalValue},
};

pub mod decode;
pub mod encode;
pub mod escape;
pub mod mode;
pub mod unescape;

/// How a decoded value type projects to and from a syntax node: `decode` reads
/// it from a node (its [`escaper`](IcalValueNode::escaper) carries the mode),
/// `encode` writes it back, escaping every leaf with the given [`Escaper`] and
/// stamping it on the node. The escaper is symmetric across the two directions:
/// decode reads it off the incoming node, encode receives the target mode and
/// applies it (the decoded value itself is escaper-agnostic clean text).
pub trait Codec<'v>: Sized {
    /// Decode the value from a syntax node.
    fn decode(node: &'v IcalValueNode<'_>) -> Self;

    /// Encode the value into a syntax node for the given escaping mode.
    fn encode(&self, escaper: Escaper) -> IcalValueNode<'static>;
}

impl<'v> Codec<'v> for IcalValue<'v> {
    /// Decode liberally as raw [`Unknown`](IcalValue::Unknown): no value kind
    /// is known at this level (that is the spec's job), so the
    /// version-divergent lenses whose target is `IcalValue` override the lens
    /// `decode` to resolve the real kind; this fallback is what the others
    /// inherit.
    fn decode(node: &'v IcalValueNode<'_>) -> Self {
        IcalValue::Unknown(IcalUnknownValue::decode(node))
    }

    /// Encode by dispatching to the held value's own codec.
    fn encode(&self, escaper: Escaper) -> IcalValueNode<'static> {
        match self {
            IcalValue::Binary(v) => v.encode(escaper),
            IcalValue::Boolean(v) => v.encode(escaper),
            IcalValue::CalAddress(v) => v.encode(escaper),
            IcalValue::Date(v) => v.encode(escaper),
            IcalValue::DateTime(v) => v.encode(escaper),
            IcalValue::DateTimeList(v) => v.encode(escaper),
            IcalValue::Duration(v) => v.encode(escaper),
            IcalValue::Float(v) => v.encode(escaper),
            IcalValue::Geo(v) => v.encode(escaper),
            IcalValue::Integer(v) => v.encode(escaper),
            IcalValue::Period(v) => v.encode(escaper),
            IcalValue::Recur(v) => v.encode(escaper),
            IcalValue::RequestStatus(v) => v.encode(escaper),
            IcalValue::Text(v) => v.encode(escaper),
            IcalValue::TextList(v) => v.encode(escaper),
            IcalValue::Time(v) => v.encode(escaper),
            IcalValue::Uri(v) => v.encode(escaper),
            IcalValue::UtcOffset(v) => v.encode(escaper),
            IcalValue::Unknown(v) => v.encode(escaper),
        }
    }
}