typeface 0.5.0

The package provides a foundation for building and parsing fonts.
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
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

//! Types that can be read and written.

use crate::Result;

/// A type that can be read.
pub trait Read: Sized {
    /// Read a value.
    fn read<T: crate::tape::Read>(_: &mut T) -> Result<Self>;
}

/// A type that can be written.
pub trait Write {
    /// Write the value.
    fn write<T: crate::tape::Write>(&self, _: &mut T) -> Result<()>;
}

macro_rules! read {
    ($tape:ident, $size:expr) => {{
        let mut buffer: [u8; $size] = [0; $size];
        std::io::Read::read_exact($tape, &mut buffer)?;
        buffer
    }};
}

macro_rules! implement {
    ([i8; 4]) => {
        impl Read for [i8; 4] {
            #[inline]
            fn read<T: crate::tape::Read>(tape: &mut T) -> Result<Self> {
                let value = read!(tape, 4);
                Ok([
                    value[0] as i8,
                    value[1] as i8,
                    value[2] as i8,
                    value[3] as i8,
                ])
            }
        }

        impl Write for [i8; 4] {
            #[inline]
            fn write<T: crate::tape::Write>(&self, tape: &mut T) -> Result<()> {
                tape.give(&[self[0] as u8, self[1] as u8, self[2] as u8, self[3] as u8])
            }
        }
    };
    ([u8; $count:expr]) => {
        impl Read for [u8; $count] {
            #[inline]
            fn read<T: crate::tape::Read>(tape: &mut T) -> Result<Self> {
                Ok(read!(tape, $count))
            }
        }

        impl Write for [u8; $count] {
            #[inline]
            fn write<T: crate::tape::Write>(&self, tape: &mut T) -> Result<()> {
                tape.write_all(self)
            }
        }
    };
    ($type:ident, $size:expr) => {
        impl Read for $type {
            #[inline]
            fn read<T: crate::tape::Read>(tape: &mut T) -> Result<Self> {
                Ok($type::from_be_bytes(read!(tape, $size)))
            }
        }

        impl Write for $type {
            #[inline]
            fn write<T: crate::tape::Write>(&self, tape: &mut T) -> Result<()> {
                let value = self.to_be_bytes();
                tape.write_all(&value)
            }
        }
    };
}

implement!(i8, 1);
implement!(u8, 1);
implement!(i16, 2);
implement!(u16, 2);
implement!(i32, 4);
implement!(i64, 8);
implement!(u32, 4);
implement!([i8; 4]);
implement!([u8; 3]);
implement!([u8; 4]);
implement!([u8; 10]);

macro_rules! implement {
    ($($type:ident),*) => {
        impl<$($type),*> Read for ($($type),*)
        where
            $($type: Read,)*
        {
            #[inline]
            fn read<T: crate::tape::Read>(tape: &mut T) -> Result<Self> {
                Ok(($(tape.take::<$type>()?),*))
            }
        }
    };
}

implement!(U, V);

impl<U: Write> Write for [U] {
    fn write<T: crate::tape::Write>(&self, tape: &mut T) -> Result<()> {
        for value in self.iter() {
            tape.give(value)?;
        }
        Ok(())
    }
}