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

// Copyright (c) 2013-2015 Sandstorm Development Group, Inc. and contributors
// Licensed under the MIT License:
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

//! UTF-8 encoded text.

use core::{convert, ops, str};

use crate::{Error, Result};

#[derive(Copy, Clone)]
pub struct Owned(());

impl crate::traits::Owned for Owned {
    type Reader<'a> = Reader<'a>;
    type Builder<'a> = Builder<'a>;
}

pub type Reader<'a> = &'a str;

pub fn new_reader(v: &[u8]) -> Result<Reader<'_>> {
    match str::from_utf8(v) {
        Ok(v) => Ok(v),
        Err(e) => Err(Error::failed(format!(
            "Text contains non-utf8 data: {:?}",
            e
        ))),
    }
}

impl<'a> crate::traits::FromPointerReader<'a> for Reader<'a> {
    fn get_from_pointer(
        reader: &crate::private::layout::PointerReader<'a>,
        default: Option<&'a [crate::Word]>,
    ) -> Result<Reader<'a>> {
        reader.get_text(default)
    }
}

pub struct Builder<'a> {
    bytes: &'a mut [u8],
    pos: usize,
}

impl<'a> Builder<'a> {
    pub fn new(bytes: &mut [u8], pos: u32) -> Result<Builder<'_>> {
        if pos != 0 {
            if let Err(e) = str::from_utf8(bytes) {
                return Err(Error::failed(format!(
                    "Text contains non-utf8 data: {:?}",
                    e
                )));
            }
        }
        Ok(Builder {
            bytes,
            pos: pos as usize,
        })
    }

    pub fn push_ascii(&mut self, ascii: u8) {
        assert!(ascii < 128);
        self.bytes[self.pos] = ascii;
        self.pos += 1;
    }

    pub fn push_str(&mut self, string: &str) {
        let bytes = string.as_bytes();
        self.bytes[self.pos..(self.pos + bytes.len())].copy_from_slice(bytes);
        self.pos += bytes.len();
    }

    pub fn clear(&mut self) {
        for b in &mut self.bytes[..self.pos] {
            *b = 0;
        }
        self.pos = 0;
    }
}

impl<'a> ops::Deref for Builder<'a> {
    type Target = str;
    fn deref(&self) -> &str {
        str::from_utf8(self.bytes)
            .expect("text::Builder contents are checked for utf8-validity upon construction")
    }
}

impl<'a> ops::DerefMut for Builder<'a> {
    fn deref_mut(&mut self) -> &mut str {
        str::from_utf8_mut(self.bytes)
            .expect("text::Builder contents are checked for utf8-validity upon construction")
    }
}

impl<'a> convert::AsRef<str> for Builder<'a> {
    fn as_ref(&self) -> &str {
        str::from_utf8(self.bytes)
            .expect("text::Builder contents are checked for utf8-validity upon construction")
    }
}

impl<'a> crate::traits::FromPointerBuilder<'a> for Builder<'a> {
    fn init_pointer(builder: crate::private::layout::PointerBuilder<'a>, size: u32) -> Builder<'a> {
        builder.init_text(size)
    }
    fn get_from_pointer(
        builder: crate::private::layout::PointerBuilder<'a>,
        default: Option<&'a [crate::Word]>,
    ) -> Result<Builder<'a>> {
        builder.get_text(default)
    }
}

impl<'a> crate::traits::SetPointerBuilder for Reader<'a> {
    fn set_pointer_builder<'b>(
        pointer: crate::private::layout::PointerBuilder<'b>,
        value: Reader<'a>,
        _canonicalize: bool,
    ) -> Result<()> {
        pointer.set_text(value);
        Ok(())
    }
}