1macro_rules! try_next {
2 ($iter:expr, $($tt:tt)*) => {
3 match $iter.next() {
4 Some(e) => e,
5 None => return Err(crate::Error::InvalidFormat(format!($($tt)*))),
6 }
7 }
8}
9
10macro_rules! try_text {
11 ($node:expr) => {
12 match $node.text() {
13 Some(t) => t,
14 None => return Err(crate::Error::InvalidFormat("Can't get text".into())),
15 }
16 };
17}
18
19macro_rules! parse_attrs_opt {
20 ($node:expr, { $($key:expr => $lvalue:expr,)+ } $(, { $($str_key:expr => $str_lvalue:expr,)+ } )?) => {
21 for attr in $node.attributes() {
22 match attr.name() {
23 $(
24 $key => $lvalue = attr.value().parse().ok()?,
25 )+
26 $(
27 $(
28 $str_key => $str_lvalue = attr.value().into(),
29 )+
30 )?
31 _ => {}
32 }
33 }
34 };
35}
36
37macro_rules! parse_attrs {
38 ($node:expr, { $($key:expr => $lvalue:expr,)+ } $(, { $($str_key:expr => $str_lvalue:expr,)+ } )?) => {
39 for attr in $node.attributes() {
40 match attr.name() {
41 $(
42 $key => $lvalue = attr.value().parse()?,
43 )+
44 $(
45 $(
46 $str_key => $str_lvalue = attr.value().into(),
47 )+
48 )?
49 _ => {}
50 }
51 }
52 };
53}
54
55macro_rules! parse_enum {
56 (
57 $ty:ty,
58 $(
59 ($variant:ident, $text:expr),
60 )+
61 |$arg:ident| $fallback:expr,
62 ) => {
63 impl core::str::FromStr for $ty {
64 type Err = crate::Error;
65
66 fn from_str($arg: &str) -> crate::Result<$ty> {
67 match $arg {
68 $(
69 $text => Ok(<$ty>::$variant),
70 )+
71 _ => {
72 $fallback
73 }
74 }
75 }
76 }
77 };
78 (
79 $ty:ty,
80 $(
81 ($variant:ident, $text:expr),
82 )+
83 ) => {
84 parse_enum! {
85 $ty,
86 $(
87 ($variant, $text),
88 )+
89 |s| Err(crate::Error::ParseEnumError(core::any::type_name::<$ty>(), s.into())),
90 }
91 };
92}
93