fontconfig_parser/
util.rs

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}