1use super::{ExcerptId, MultiBufferSnapshot, ToOffset, ToOffsetUtf16, ToPoint};
2use language::{OffsetUtf16, Point, TextDimension};
3use std::{
4 cmp::Ordering,
5 ops::{Range, Sub},
6};
7use sum_tree::Bias;
8use text::BufferId;
9
10#[derive(Clone, Copy, Eq, PartialEq, Debug, Hash)]
11pub struct Anchor {
12 pub buffer_id: Option<BufferId>,
13 pub excerpt_id: ExcerptId,
14 pub text_anchor: text::Anchor,
15 pub diff_base_anchor: Option<text::Anchor>,
16}
17
18impl Anchor {
19 pub fn in_buffer(
20 excerpt_id: ExcerptId,
21 buffer_id: BufferId,
22 text_anchor: text::Anchor,
23 ) -> Self {
24 Self {
25 buffer_id: Some(buffer_id),
26 excerpt_id,
27 text_anchor,
28 diff_base_anchor: None,
29 }
30 }
31
32 pub fn range_in_buffer(
33 excerpt_id: ExcerptId,
34 buffer_id: BufferId,
35 range: Range<text::Anchor>,
36 ) -> Range<Self> {
37 Self::in_buffer(excerpt_id, buffer_id, range.start)
38 ..Self::in_buffer(excerpt_id, buffer_id, range.end)
39 }
40
41 pub fn min() -> Self {
42 Self {
43 buffer_id: None,
44 excerpt_id: ExcerptId::min(),
45 text_anchor: text::Anchor::MIN,
46 diff_base_anchor: None,
47 }
48 }
49
50 pub fn max() -> Self {
51 Self {
52 buffer_id: None,
53 excerpt_id: ExcerptId::max(),
54 text_anchor: text::Anchor::MAX,
55 diff_base_anchor: None,
56 }
57 }
58
59 pub fn cmp(&self, other: &Anchor, snapshot: &MultiBufferSnapshot) -> Ordering {
60 if self == other {
61 return Ordering::Equal;
62 }
63
64 let excerpt_id_cmp = self.excerpt_id.cmp(&other.excerpt_id, snapshot);
65 if excerpt_id_cmp.is_ne() {
66 return excerpt_id_cmp;
67 }
68 if self.excerpt_id == ExcerptId::min() || self.excerpt_id == ExcerptId::max() {
69 return Ordering::Equal;
70 }
71 if let Some(excerpt) = snapshot.excerpt(self.excerpt_id) {
72 let text_cmp = self.text_anchor.cmp(&other.text_anchor, &excerpt.buffer);
73 if text_cmp.is_ne() {
74 return text_cmp;
75 }
76 if self.diff_base_anchor.is_some() || other.diff_base_anchor.is_some() {
77 if let Some(base_text) = snapshot
78 .diffs
79 .get(&excerpt.buffer_id)
80 .map(|diff| diff.base_text())
81 {
82 let self_anchor = self.diff_base_anchor.filter(|a| base_text.can_resolve(a));
83 let other_anchor = other.diff_base_anchor.filter(|a| base_text.can_resolve(a));
84 return match (self_anchor, other_anchor) {
85 (Some(a), Some(b)) => a.cmp(&b, base_text),
86 (Some(_), None) => match other.text_anchor.bias {
87 Bias::Left => Ordering::Greater,
88 Bias::Right => Ordering::Less,
89 },
90 (None, Some(_)) => match self.text_anchor.bias {
91 Bias::Left => Ordering::Less,
92 Bias::Right => Ordering::Greater,
93 },
94 (None, None) => Ordering::Equal,
95 };
96 }
97 }
98 }
99 Ordering::Equal
100 }
101
102 pub fn bias(&self) -> Bias {
103 self.text_anchor.bias
104 }
105
106 pub fn bias_left(&self, snapshot: &MultiBufferSnapshot) -> Anchor {
107 if self.text_anchor.bias != Bias::Left {
108 if let Some(excerpt) = snapshot.excerpt(self.excerpt_id) {
109 return Self {
110 buffer_id: self.buffer_id,
111 excerpt_id: self.excerpt_id,
112 text_anchor: self.text_anchor.bias_left(&excerpt.buffer),
113 diff_base_anchor: self.diff_base_anchor.map(|a| {
114 if let Some(base_text) = snapshot
115 .diffs
116 .get(&excerpt.buffer_id)
117 .map(|diff| diff.base_text())
118 {
119 if a.buffer_id == Some(base_text.remote_id()) {
120 return a.bias_left(base_text);
121 }
122 }
123 a
124 }),
125 };
126 }
127 }
128 *self
129 }
130
131 pub fn bias_right(&self, snapshot: &MultiBufferSnapshot) -> Anchor {
132 if self.text_anchor.bias != Bias::Right {
133 if let Some(excerpt) = snapshot.excerpt(self.excerpt_id) {
134 return Self {
135 buffer_id: self.buffer_id,
136 excerpt_id: self.excerpt_id,
137 text_anchor: self.text_anchor.bias_right(&excerpt.buffer),
138 diff_base_anchor: self.diff_base_anchor.map(|a| {
139 if let Some(base_text) = snapshot
140 .diffs
141 .get(&excerpt.buffer_id)
142 .map(|diff| diff.base_text())
143 {
144 if a.buffer_id == Some(base_text.remote_id()) {
145 return a.bias_right(&base_text);
146 }
147 }
148 a
149 }),
150 };
151 }
152 }
153 *self
154 }
155
156 pub fn summary<D>(&self, snapshot: &MultiBufferSnapshot) -> D
157 where
158 D: TextDimension + Ord + Sub<D, Output = D>,
159 {
160 snapshot.summary_for_anchor(self)
161 }
162
163 pub fn is_valid(&self, snapshot: &MultiBufferSnapshot) -> bool {
164 if *self == Anchor::min() || *self == Anchor::max() {
165 true
166 } else if let Some(excerpt) = snapshot.excerpt(self.excerpt_id) {
167 excerpt.contains(self)
168 && (self.text_anchor == excerpt.range.context.start
169 || self.text_anchor == excerpt.range.context.end
170 || self.text_anchor.is_valid(&excerpt.buffer))
171 } else {
172 false
173 }
174 }
175}
176
177impl ToOffset for Anchor {
178 fn to_offset(&self, snapshot: &MultiBufferSnapshot) -> usize {
179 self.summary(snapshot)
180 }
181}
182
183impl ToOffsetUtf16 for Anchor {
184 fn to_offset_utf16(&self, snapshot: &MultiBufferSnapshot) -> OffsetUtf16 {
185 self.summary(snapshot)
186 }
187}
188
189impl ToPoint for Anchor {
190 fn to_point<'a>(&self, snapshot: &MultiBufferSnapshot) -> Point {
191 self.summary(snapshot)
192 }
193}
194
195pub trait AnchorRangeExt {
196 fn cmp(&self, other: &Range<Anchor>, buffer: &MultiBufferSnapshot) -> Ordering;
197 fn includes(&self, other: &Range<Anchor>, buffer: &MultiBufferSnapshot) -> bool;
198 fn overlaps(&self, other: &Range<Anchor>, buffer: &MultiBufferSnapshot) -> bool;
199 fn to_offset(&self, content: &MultiBufferSnapshot) -> Range<usize>;
200 fn to_point(&self, content: &MultiBufferSnapshot) -> Range<Point>;
201}
202
203impl AnchorRangeExt for Range<Anchor> {
204 fn cmp(&self, other: &Range<Anchor>, buffer: &MultiBufferSnapshot) -> Ordering {
205 match self.start.cmp(&other.start, buffer) {
206 Ordering::Equal => other.end.cmp(&self.end, buffer),
207 ord => ord,
208 }
209 }
210
211 fn includes(&self, other: &Range<Anchor>, buffer: &MultiBufferSnapshot) -> bool {
212 self.start.cmp(&other.start, &buffer).is_le() && other.end.cmp(&self.end, &buffer).is_le()
213 }
214
215 fn overlaps(&self, other: &Range<Anchor>, buffer: &MultiBufferSnapshot) -> bool {
216 self.end.cmp(&other.start, buffer).is_ge() && self.start.cmp(&other.end, buffer).is_le()
217 }
218
219 fn to_offset(&self, content: &MultiBufferSnapshot) -> Range<usize> {
220 self.start.to_offset(content)..self.end.to_offset(content)
221 }
222
223 fn to_point(&self, content: &MultiBufferSnapshot) -> Range<Point> {
224 self.start.to_point(content)..self.end.to_point(content)
225 }
226}
227
228#[derive(Clone, Copy, Eq, PartialEq, Debug, Hash, Ord, PartialOrd)]
229pub struct Offset(pub usize);