[go: up one dir, main page]

quote 0.3.11

Quasi-quoting macro quote!(...)
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
146
147
148
149
150

use super::ToTokens;
use std::fmt::{self, Display};
use std::str::FromStr;

/// Tokens produced by a `quote!(...)` invocation.
#[derive(Debug, Clone, Eq, PartialEq)]
pub struct Tokens(String);

impl Tokens {
    /// Empty tokens.
    pub fn new() -> Self {
        Tokens(String::new())
    }

    /// For use by `ToTokens` implementations.
    ///
    /// ```
    /// # #[macro_use] extern crate quote;
    /// # use quote::{Tokens, ToTokens};
    /// # fn main() {
    /// struct X;
    ///
    /// impl ToTokens for X {
    ///     fn to_tokens(&self, tokens: &mut Tokens) {
    ///         tokens.append("a");
    ///         tokens.append("b");
    ///         tokens.append("c");
    ///     }
    /// }
    ///
    /// let x = X;
    /// let tokens = quote!(#x);
    /// assert_eq!(tokens.as_str(), "a b c");
    /// # }
    /// ```
    pub fn append(&mut self, token: &str) {
        if !self.0.is_empty() && !token.is_empty() {
            self.0.push(' ');
        }
        self.0.push_str(token);
    }

    /// For use by `ToTokens` implementations.
    ///
    /// ```
    /// # #[macro_use] extern crate quote;
    /// # use quote::{Tokens, ToTokens};
    /// # fn main() {
    /// struct X;
    ///
    /// impl ToTokens for X {
    ///     fn to_tokens(&self, tokens: &mut Tokens) {
    ///         tokens.append_all(&[true, false]);
    ///     }
    /// }
    ///
    /// let x = X;
    /// let tokens = quote!(#x);
    /// assert_eq!(tokens.as_str(), "true false");
    /// # }
    /// ```
    pub fn append_all<T, I>(&mut self, iter: I)
        where T: ToTokens,
              I: IntoIterator<Item = T>
    {
        for token in iter {
            token.to_tokens(self);
        }
    }

    /// For use by `ToTokens` implementations.
    ///
    /// ```
    /// # #[macro_use] extern crate quote;
    /// # use quote::{Tokens, ToTokens};
    /// # fn main() {
    /// struct X;
    ///
    /// impl ToTokens for X {
    ///     fn to_tokens(&self, tokens: &mut Tokens) {
    ///         tokens.append_separated(&[true, false], ",");
    ///     }
    /// }
    ///
    /// let x = X;
    /// let tokens = quote!(#x);
    /// assert_eq!(tokens.as_str(), "true , false");
    /// # }
    /// ```
    pub fn append_separated<T, I>(&mut self, iter: I, sep: &str)
        where T: ToTokens,
              I: IntoIterator<Item = T>
    {
        for (i, token) in iter.into_iter().enumerate() {
            if i > 0 {
                self.append(sep);
            }
            token.to_tokens(self);
        }
    }

    /// For use by `ToTokens` implementations.
    ///
    /// ```
    /// # #[macro_use] extern crate quote;
    /// # use quote::{Tokens, ToTokens};
    /// # fn main() {
    /// struct X;
    ///
    /// impl ToTokens for X {
    ///     fn to_tokens(&self, tokens: &mut Tokens) {
    ///         tokens.append_terminated(&[true, false], ",");
    ///     }
    /// }
    ///
    /// let x = X;
    /// let tokens = quote!(#x);
    /// assert_eq!(tokens.as_str(), "true , false ,");
    /// # }
    /// ```
    pub fn append_terminated<T, I>(&mut self, iter: I, term: &str)
        where T: ToTokens,
              I: IntoIterator<Item = T>
    {
        for token in iter {
            token.to_tokens(self);
            self.append(term);
        }
    }

    pub fn as_str(&self) -> &str {
        &self.0
    }

    pub fn parse<T: FromStr>(&self) -> Result<T, T::Err> {
        FromStr::from_str(&self.0)
    }
}

impl Default for Tokens {
    fn default() -> Self {
        Tokens::new()
    }
}

impl Display for Tokens {
    fn fmt(&self, formatter: &mut fmt::Formatter) -> Result<(), fmt::Error> {
        self.0.fmt(formatter)
    }
}