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
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
use std::borrow::Cow;
use std::str::FromStr;

use crate::repr::{Decor, Repr};
use crate::InternalString;

/// Key as part of a Key/Value Pair or a table header.
///
/// # Examples
///
/// ```notrust
/// [dependencies."nom"]
/// version = "5.0"
/// 'literal key' = "nonsense"
/// "basic string key" = 42
/// ```
///
/// There are 3 types of keys:
///
/// 1. Bare keys (`version` and `dependencies`)
///
/// 2. Basic quoted keys (`"basic string key"` and `"nom"`)
///
/// 3. Literal quoted keys (`'literal key'`)
///
/// For details see [toml spec](https://github.com/toml-lang/toml/#keyvalue-pair).
///
/// To parse a key use `FromStr` trait implementation: `"string".parse::<Key>()`.
#[derive(Debug)]
pub struct Key {
    key: InternalString,
    pub(crate) repr: Option<Repr>,
    pub(crate) leaf_decor: Decor,
    pub(crate) dotted_decor: Decor,
}

impl Key {
    /// Create a new table key
    pub fn new(key: impl Into<InternalString>) -> Self {
        Self {
            key: key.into(),
            repr: None,
            leaf_decor: Default::default(),
            dotted_decor: Default::default(),
        }
    }

    /// Parse a TOML key expression
    ///
    /// Unlike `"".parse<Key>()`, this supports dotted keys.
    #[cfg(feature = "parse")]
    pub fn parse(repr: &str) -> Result<Vec<Self>, crate::TomlError> {
        Self::try_parse_path(repr)
    }

    pub(crate) fn with_repr_unchecked(mut self, repr: Repr) -> Self {
        self.repr = Some(repr);
        self
    }

    /// While creating the `Key`, add `Decor` to it
    #[deprecated(since = "0.21.1", note = "Replaced with `with_leaf_decor`")]
    pub fn with_decor(self, decor: Decor) -> Self {
        self.with_leaf_decor(decor)
    }

    /// While creating the `Key`, add `Decor` to it for the line entry
    pub fn with_leaf_decor(mut self, decor: Decor) -> Self {
        self.leaf_decor = decor;
        self
    }

    /// While creating the `Key`, add `Decor` to it for between dots
    pub fn with_dotted_decor(mut self, decor: Decor) -> Self {
        self.dotted_decor = decor;
        self
    }

    /// Access a mutable proxy for the `Key`.
    pub fn as_mut(&mut self) -> KeyMut<'_> {
        KeyMut { key: self }
    }

    /// Returns the parsed key value.
    pub fn get(&self) -> &str {
        &self.key
    }

    pub(crate) fn get_internal(&self) -> &InternalString {
        &self.key
    }

    /// Returns key raw representation, if available.
    pub fn as_repr(&self) -> Option<&Repr> {
        self.repr.as_ref()
    }

    /// Returns the default raw representation.
    #[cfg(feature = "display")]
    pub fn default_repr(&self) -> Repr {
        to_key_repr(&self.key)
    }

    /// Returns a raw representation.
    #[cfg(feature = "display")]
    pub fn display_repr(&self) -> Cow<'_, str> {
        self.as_repr()
            .and_then(|r| r.as_raw().as_str())
            .map(Cow::Borrowed)
            .unwrap_or_else(|| {
                Cow::Owned(self.default_repr().as_raw().as_str().unwrap().to_owned())
            })
    }

    /// Returns the surrounding whitespace
    #[deprecated(
        since = "0.21.1",
        note = "Replaced with `dotted_decor_mut`, `leaf_decor_mut"
    )]
    pub fn decor_mut(&mut self) -> &mut Decor {
        self.leaf_decor_mut()
    }

    /// Returns the surrounding whitespace for the line entry
    pub fn leaf_decor_mut(&mut self) -> &mut Decor {
        &mut self.leaf_decor
    }

    /// Returns the surrounding whitespace for between dots
    pub fn dotted_decor_mut(&mut self) -> &mut Decor {
        &mut self.dotted_decor
    }

    /// Returns the surrounding whitespace
    #[deprecated(since = "0.21.1", note = "Replaced with `dotted_decor`, `leaf_decor")]
    pub fn decor(&self) -> &Decor {
        self.leaf_decor()
    }

    /// Returns the surrounding whitespace for the line entry
    pub fn leaf_decor(&self) -> &Decor {
        &self.leaf_decor
    }

    /// Returns the surrounding whitespace for between dots
    pub fn dotted_decor(&self) -> &Decor {
        &self.dotted_decor
    }

    /// The location within the original document
    ///
    /// This generally requires an [`ImDocument`][crate::ImDocument].
    pub fn span(&self) -> Option<std::ops::Range<usize>> {
        self.repr.as_ref().and_then(|r| r.span())
    }

    pub(crate) fn despan(&mut self, input: &str) {
        self.leaf_decor.despan(input);
        self.dotted_decor.despan(input);
        if let Some(repr) = &mut self.repr {
            repr.despan(input);
        }
    }

    /// Auto formats the key.
    pub fn fmt(&mut self) {
        self.repr = None;
        self.leaf_decor.clear();
        self.dotted_decor.clear();
    }

    #[cfg(feature = "parse")]
    fn try_parse_simple(s: &str) -> Result<Key, crate::TomlError> {
        let mut key = crate::parser::parse_key(s)?;
        key.despan(s);
        Ok(key)
    }

    #[cfg(feature = "parse")]
    fn try_parse_path(s: &str) -> Result<Vec<Key>, crate::TomlError> {
        let mut keys = crate::parser::parse_key_path(s)?;
        for key in &mut keys {
            key.despan(s);
        }
        Ok(keys)
    }
}

impl Clone for Key {
    #[inline(never)]
    fn clone(&self) -> Self {
        Self {
            key: self.key.clone(),
            repr: self.repr.clone(),
            leaf_decor: self.leaf_decor.clone(),
            dotted_decor: self.dotted_decor.clone(),
        }
    }
}

impl std::ops::Deref for Key {
    type Target = str;

    fn deref(&self) -> &Self::Target {
        self.get()
    }
}

impl std::hash::Hash for Key {
    fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
        self.get().hash(state);
    }
}

impl Ord for Key {
    fn cmp(&self, other: &Self) -> std::cmp::Ordering {
        self.get().cmp(other.get())
    }
}

impl PartialOrd for Key {
    fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
        Some(self.cmp(other))
    }
}

impl Eq for Key {}

impl PartialEq for Key {
    #[inline]
    fn eq(&self, other: &Key) -> bool {
        PartialEq::eq(self.get(), other.get())
    }
}

impl PartialEq<str> for Key {
    #[inline]
    fn eq(&self, other: &str) -> bool {
        PartialEq::eq(self.get(), other)
    }
}

impl<'s> PartialEq<&'s str> for Key {
    #[inline]
    fn eq(&self, other: &&str) -> bool {
        PartialEq::eq(self.get(), *other)
    }
}

impl PartialEq<String> for Key {
    #[inline]
    fn eq(&self, other: &String) -> bool {
        PartialEq::eq(self.get(), other.as_str())
    }
}

#[cfg(feature = "display")]
impl std::fmt::Display for Key {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        crate::encode::encode_key(self, f, None)
    }
}

#[cfg(feature = "parse")]
impl FromStr for Key {
    type Err = crate::TomlError;

    /// Tries to parse a key from a &str,
    /// if fails, tries as basic quoted key (surrounds with "")
    /// and then literal quoted key (surrounds with '')
    fn from_str(s: &str) -> Result<Self, Self::Err> {
        Key::try_parse_simple(s)
    }
}

#[cfg(feature = "display")]
fn to_key_repr(key: &str) -> Repr {
    #[cfg(feature = "parse")]
    {
        if key
            .as_bytes()
            .iter()
            .copied()
            .all(crate::parser::key::is_unquoted_char)
            && !key.is_empty()
        {
            Repr::new_unchecked(key)
        } else {
            crate::encode::to_string_repr(
                key,
                Some(crate::encode::StringStyle::OnelineSingle),
                Some(false),
            )
        }
    }
    #[cfg(not(feature = "parse"))]
    {
        crate::encode::to_string_repr(
            key,
            Some(crate::encode::StringStyle::OnelineSingle),
            Some(false),
        )
    }
}

impl<'b> From<&'b str> for Key {
    fn from(s: &'b str) -> Self {
        Key::new(s)
    }
}

impl<'b> From<&'b String> for Key {
    fn from(s: &'b String) -> Self {
        Key::new(s)
    }
}

impl From<String> for Key {
    fn from(s: String) -> Self {
        Key::new(s)
    }
}

impl From<InternalString> for Key {
    fn from(s: InternalString) -> Self {
        Key::new(s)
    }
}

#[doc(hidden)]
impl From<Key> for InternalString {
    fn from(key: Key) -> InternalString {
        key.key
    }
}

/// A mutable reference to a `Key`'s formatting
#[derive(Debug, Eq, PartialEq, PartialOrd, Ord, Hash)]
pub struct KeyMut<'k> {
    key: &'k mut Key,
}

impl<'k> KeyMut<'k> {
    /// Returns the parsed key value.
    pub fn get(&self) -> &str {
        self.key.get()
    }

    /// Returns the raw representation, if available.
    pub fn as_repr(&self) -> Option<&Repr> {
        self.key.as_repr()
    }

    /// Returns the default raw representation.
    #[cfg(feature = "display")]
    pub fn default_repr(&self) -> Repr {
        self.key.default_repr()
    }

    /// Returns a raw representation.
    #[cfg(feature = "display")]
    pub fn display_repr(&self) -> Cow<'_, str> {
        self.key.display_repr()
    }

    /// Returns the surrounding whitespace
    #[deprecated(
        since = "0.21.1",
        note = "Replaced with `dotted_decor_mut`, `leaf_decor_mut"
    )]
    pub fn decor_mut(&mut self) -> &mut Decor {
        #![allow(deprecated)]
        self.key.decor_mut()
    }

    /// Returns the surrounding whitespace for the line entry
    pub fn leaf_decor_mut(&mut self) -> &mut Decor {
        self.key.leaf_decor_mut()
    }

    /// Returns the surrounding whitespace for between dots
    pub fn dotted_decor_mut(&mut self) -> &mut Decor {
        self.key.dotted_decor_mut()
    }

    /// Returns the surrounding whitespace
    #[deprecated(since = "0.21.1", note = "Replaced with `dotted_decor`, `leaf_decor")]
    pub fn decor(&self) -> &Decor {
        #![allow(deprecated)]
        self.key.decor()
    }

    /// Returns the surrounding whitespace for the line entry
    pub fn leaf_decor(&self) -> &Decor {
        self.key.leaf_decor()
    }

    /// Returns the surrounding whitespace for between dots
    pub fn dotted_decor(&self) -> &Decor {
        self.key.dotted_decor()
    }

    /// Auto formats the key.
    pub fn fmt(&mut self) {
        self.key.fmt();
    }
}

impl<'k> std::ops::Deref for KeyMut<'k> {
    type Target = str;

    fn deref(&self) -> &Self::Target {
        self.get()
    }
}

impl<'s> PartialEq<str> for KeyMut<'s> {
    #[inline]
    fn eq(&self, other: &str) -> bool {
        PartialEq::eq(self.get(), other)
    }
}

impl<'s> PartialEq<&'s str> for KeyMut<'s> {
    #[inline]
    fn eq(&self, other: &&str) -> bool {
        PartialEq::eq(self.get(), *other)
    }
}

impl<'s> PartialEq<String> for KeyMut<'s> {
    #[inline]
    fn eq(&self, other: &String) -> bool {
        PartialEq::eq(self.get(), other.as_str())
    }
}

#[cfg(feature = "display")]
impl<'k> std::fmt::Display for KeyMut<'k> {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        std::fmt::Display::fmt(&self.key, f)
    }
}

#[test]
#[cfg(feature = "parse")]
#[cfg(feature = "display")]
fn string_roundtrip() {
    Key::new("hello").to_string().parse::<Key>().unwrap();
}