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
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
/// Define a type that supports parsing and printing a given identifier as if it
/// were a keyword.
///
/// # Usage
///
/// As a convention, it is recommended that this macro be invoked within a
/// module called `kw` or `keyword` and that the resulting parser be invoked
/// with a `kw::` or `keyword::` prefix.
///
/// ```
/// mod kw {
///     syn::custom_keyword!(whatever);
/// }
/// ```
///
/// The generated syntax tree node supports the following operations just like
/// any built-in keyword token.
///
/// - [Peeking] — `input.peek(kw::whatever)`
///
/// - [Parsing] — `input.parse::<kw::whatever>()?`
///
/// - [Printing] — `quote!( ... #whatever_token ... )`
///
/// - Construction from a [`Span`] — `let whatever_token = kw::whatever(sp)`
///
/// - Field access to its span — `let sp = whatever_token.span`
///
/// [Peeking]: crate::parse::ParseBuffer::peek
/// [Parsing]: crate::parse::ParseBuffer::parse
/// [Printing]: quote::ToTokens
/// [`Span`]: proc_macro2::Span
///
/// # Example
///
/// This example parses input that looks like `bool = true` or `str = "value"`.
/// The key must be either the identifier `bool` or the identifier `str`. If
/// `bool`, the value may be either `true` or `false`. If `str`, the value may
/// be any string literal.
///
/// The symbols `bool` and `str` are not reserved keywords in Rust so these are
/// not considered keywords in the `syn::token` module. Like any other
/// identifier that is not a keyword, these can be declared as custom keywords
/// by crates that need to use them as such.
///
/// ```
/// use syn::{LitBool, LitStr, Result, Token};
/// use syn::parse::{Parse, ParseStream};
///
/// mod kw {
///     syn::custom_keyword!(bool);
///     syn::custom_keyword!(str);
/// }
///
/// enum Argument {
///     Bool {
///         bool_token: kw::bool,
///         eq_token: Token![=],
///         value: LitBool,
///     },
///     Str {
///         str_token: kw::str,
///         eq_token: Token![=],
///         value: LitStr,
///     },
/// }
///
/// impl Parse for Argument {
///     fn parse(input: ParseStream) -> Result<Self> {
///         let lookahead = input.lookahead1();
///         if lookahead.peek(kw::bool) {
///             Ok(Argument::Bool {
///                 bool_token: input.parse::<kw::bool>()?,
///                 eq_token: input.parse()?,
///                 value: input.parse()?,
///             })
///         } else if lookahead.peek(kw::str) {
///             Ok(Argument::Str {
///                 str_token: input.parse::<kw::str>()?,
///                 eq_token: input.parse()?,
///                 value: input.parse()?,
///             })
///         } else {
///             Err(lookahead.error())
///         }
///     }
/// }
/// ```
#[macro_export]
macro_rules! custom_keyword {
    ($ident:ident) => {
        #[allow(non_camel_case_types)]
        pub struct $ident {
            pub span: $crate::__private::Span,
        }

        #[doc(hidden)]
        #[allow(dead_code, non_snake_case)]
        pub fn $ident<__S: $crate::__private::IntoSpans<[$crate::__private::Span; 1]>>(
            span: __S,
        ) -> $ident {
            $ident {
                span: $crate::__private::IntoSpans::into_spans(span)[0],
            }
        }

        impl $crate::__private::Default for $ident {
            fn default() -> Self {
                $ident {
                    span: $crate::__private::Span::call_site(),
                }
            }
        }

        $crate::impl_parse_for_custom_keyword!($ident);
        $crate::impl_to_tokens_for_custom_keyword!($ident);
        $crate::impl_clone_for_custom_keyword!($ident);
        $crate::impl_extra_traits_for_custom_keyword!($ident);
    };
}

// Not public API.
#[cfg(feature = "parsing")]
#[doc(hidden)]
#[macro_export]
macro_rules! impl_parse_for_custom_keyword {
    ($ident:ident) => {
        // For peek.
        impl $crate::token::CustomToken for $ident {
            fn peek(cursor: $crate::buffer::Cursor) -> $crate::__private::bool {
                if let Some((ident, _rest)) = cursor.ident() {
                    ident == stringify!($ident)
                } else {
                    false
                }
            }

            fn display() -> &'static $crate::__private::str {
                concat!("`", stringify!($ident), "`")
            }
        }

        impl $crate::parse::Parse for $ident {
            fn parse(input: $crate::parse::ParseStream) -> $crate::parse::Result<$ident> {
                input.step(|cursor| {
                    if let $crate::__private::Some((ident, rest)) = cursor.ident() {
                        if ident == stringify!($ident) {
                            return $crate::__private::Ok(($ident { span: ident.span() }, rest));
                        }
                    }
                    $crate::__private::Err(cursor.error(concat!(
                        "expected `",
                        stringify!($ident),
                        "`"
                    )))
                })
            }
        }
    };
}

// Not public API.
#[cfg(not(feature = "parsing"))]
#[doc(hidden)]
#[macro_export]
macro_rules! impl_parse_for_custom_keyword {
    ($ident:ident) => {};
}

// Not public API.
#[cfg(feature = "printing")]
#[doc(hidden)]
#[macro_export]
macro_rules! impl_to_tokens_for_custom_keyword {
    ($ident:ident) => {
        impl $crate::__private::ToTokens for $ident {
            fn to_tokens(&self, tokens: &mut $crate::__private::TokenStream2) {
                let ident = $crate::Ident::new(stringify!($ident), self.span);
                $crate::__private::TokenStreamExt::append(tokens, ident);
            }
        }
    };
}

// Not public API.
#[cfg(not(feature = "printing"))]
#[doc(hidden)]
#[macro_export]
macro_rules! impl_to_tokens_for_custom_keyword {
    ($ident:ident) => {};
}

// Not public API.
#[cfg(feature = "clone-impls")]
#[doc(hidden)]
#[macro_export]
macro_rules! impl_clone_for_custom_keyword {
    ($ident:ident) => {
        impl $crate::__private::Copy for $ident {}

        impl $crate::__private::Clone for $ident {
            fn clone(&self) -> Self {
                *self
            }
        }
    };
}

// Not public API.
#[cfg(not(feature = "clone-impls"))]
#[doc(hidden)]
#[macro_export]
macro_rules! impl_clone_for_custom_keyword {
    ($ident:ident) => {};
}

// Not public API.
#[cfg(feature = "extra-traits")]
#[doc(hidden)]
#[macro_export]
macro_rules! impl_extra_traits_for_custom_keyword {
    ($ident:ident) => {
        impl $crate::__private::Debug for $ident {
            fn fmt(&self, f: &mut $crate::__private::Formatter) -> $crate::__private::fmt::Result {
                $crate::__private::Formatter::write_str(
                    f,
                    concat!("Keyword [", stringify!($ident), "]"),
                )
            }
        }

        impl $crate::__private::Eq for $ident {}

        impl $crate::__private::PartialEq for $ident {
            fn eq(&self, _other: &Self) -> $crate::__private::bool {
                true
            }
        }

        impl $crate::__private::Hash for $ident {
            fn hash<__H: $crate::__private::Hasher>(&self, _state: &mut __H) {}
        }
    };
}

// Not public API.
#[cfg(not(feature = "extra-traits"))]
#[doc(hidden)]
#[macro_export]
macro_rules! impl_extra_traits_for_custom_keyword {
    ($ident:ident) => {};
}