serde_encom 0.4.0

Official EnCom library
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
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145

use super::formatter::Formatter;
use crate::io;

/// This structure pretty prints an EnCom value to make it human readable.
#[derive(Clone, Debug)]
pub(crate) struct PrettyFormatter<'a> {
    current_indent: usize,
    has_value: bool,
    indent: &'a [u8],
}

impl<'a> PrettyFormatter<'a> {
    /// Construct a pretty printer formatter that defaults to using two spaces for indentation.
    pub fn new() -> Self {
        PrettyFormatter::with_indent(b"  ")
    }

    /// Construct a pretty printer formatter that uses the `indent` string for indentation.
    pub fn with_indent(indent: &'a [u8]) -> Self {
        PrettyFormatter {
            current_indent: 0,
            has_value: false,
            indent,
        }
    }
}

impl<'a> Default for PrettyFormatter<'a> {
    fn default() -> Self {
        PrettyFormatter::new()
    }
}

impl<'a> Formatter for PrettyFormatter<'a> {
    #[inline]
    fn begin_array<W>(&mut self, writer: &mut W) -> io::Result<()>
    where
        W: ?Sized + io::Write,
    {
        self.current_indent += 1;
        self.has_value = false;
        writer.write_all(b"[\n")?;
        indent(writer, self.current_indent, self.indent)
    }

    #[inline]
    fn end_array<W>(&mut self, writer: &mut W) -> io::Result<()>
    where
        W: ?Sized + io::Write,
    {
        self.current_indent -= 1;

        if self.has_value {
            writer.write_all(b"\n")?;
            indent(writer, self.current_indent, self.indent)?;
        }

        writer.write_all(b"]")
    }

    #[inline]
    fn begin_array_value<W>(&mut self, writer: &mut W) -> io::Result<()>
    where
        W: ?Sized + io::Write,
    {
        writer.write_all(b"\n")?;
        indent(writer, self.current_indent, self.indent)
    }

    #[inline]
    fn end_array_value<W>(&mut self, _writer: &mut W) -> io::Result<()>
    where
        W: ?Sized + io::Write,
    {
        self.has_value = true;
        Ok(())
    }

    #[inline]
    fn begin_object<W>(&mut self, writer: &mut W) -> io::Result<()>
    where
        W: ?Sized + io::Write,
    {
        self.current_indent += 1;
        self.has_value = false;
        writer.write_all(b"{\n")?;
        indent(writer, self.current_indent, self.indent)
    }

    #[inline]
    fn end_object<W>(&mut self, writer: &mut W) -> io::Result<()>
    where
        W: ?Sized + io::Write,
    {
        self.current_indent -= 1;

        if self.has_value {
            writer.write_all(b"\n")?;
            indent(writer, self.current_indent, self.indent)?;
        }

        writer.write_all(b"}")
    }

    #[inline]
    fn begin_data_key<W>(&mut self, writer: &mut W, first: bool) -> io::Result<()>
    where
        W: ?Sized + io::Write,
    {
        if first {
            Ok(())
        } else {
            writer.write_all(b"\n")?;
            indent(writer, self.current_indent, self.indent)
        }
    }

    #[inline]
    fn begin_data<W>(&mut self, writer: &mut W) -> io::Result<()>
    where
        W: ?Sized + io::Write,
    {
        writer.write_all(b":")
    }

    #[inline]
    fn end_data<W>(&mut self, _writer: &mut W) -> io::Result<()>
    where
        W: ?Sized + io::Write,
    {
        self.has_value = true;
        Ok(())
    }
}

fn indent<W>(wr: &mut W, n: usize, s: &[u8]) -> io::Result<()>
where
    W: ?Sized + io::Write,
{
    for _ in 0..n {
        wr.write_all(s)?;
    }

    Ok(())
}