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 let excerpt_id_cmp = self.excerpt_id.cmp(&other.excerpt_id, snapshot);
61 if excerpt_id_cmp.is_ne() {
62 return excerpt_id_cmp;
63 }
64 if self.excerpt_id == ExcerptId::min() || self.excerpt_id == ExcerptId::max() {
65 return Ordering::Equal;
66 }
67 if let Some(excerpt) = snapshot.excerpt(self.excerpt_id) {
68 let text_cmp = self.text_anchor.cmp(&other.text_anchor, &excerpt.buffer);
69 if text_cmp.is_ne() {
70 return text_cmp;
71 }
72 if self.diff_base_anchor.is_some() || other.diff_base_anchor.is_some() {
73 if let Some(base_text) = snapshot
74 .diffs
75 .get(&excerpt.buffer_id)
76 .map(|diff| diff.base_text())
77 {
78 let self_anchor = self.diff_base_anchor.filter(|a| base_text.can_resolve(a));
79 let other_anchor = other.diff_base_anchor.filter(|a| base_text.can_resolve(a));
80 return match (self_anchor, other_anchor) {
81 (Some(a), Some(b)) => a.cmp(&b, base_text),
82 (Some(_), None) => match other.text_anchor.bias {
83 Bias::Left => Ordering::Greater,
84 Bias::Right => Ordering::Less,
85 },
86 (None, Some(_)) => match self.text_anchor.bias {
87 Bias::Left => Ordering::Less,
88 Bias::Right => Ordering::Greater,
89 },
90 (None, None) => Ordering::Equal,
91 };
92 }
93 }
94 }
95 Ordering::Equal
96 }
97
98 pub fn bias(&self) -> Bias {
99 self.text_anchor.bias
100 }
101
102 pub fn bias_left(&self, snapshot: &MultiBufferSnapshot) -> Anchor {
103 if self.text_anchor.bias != Bias::Left {
104 if let Some(excerpt) = snapshot.excerpt(self.excerpt_id) {
105 return Self {
106 buffer_id: self.buffer_id,
107 excerpt_id: self.excerpt_id,
108 text_anchor: self.text_anchor.bias_left(&excerpt.buffer),
109 diff_base_anchor: self.diff_base_anchor.map(|a| {
110 if let Some(base_text) = snapshot
111 .diffs
112 .get(&excerpt.buffer_id)
113 .map(|diff| diff.base_text())
114 {
115 if a.buffer_id == Some(base_text.remote_id()) {
116 return a.bias_left(base_text);
117 }
118 }
119 a
120 }),
121 };
122 }
123 }
124 *self
125 }
126
127 pub fn bias_right(&self, snapshot: &MultiBufferSnapshot) -> Anchor {
128 if self.text_anchor.bias != Bias::Right {
129 if let Some(excerpt) = snapshot.excerpt(self.excerpt_id) {
130 return Self {
131 buffer_id: self.buffer_id,
132 excerpt_id: self.excerpt_id,
133 text_anchor: self.text_anchor.bias_right(&excerpt.buffer),
134 diff_base_anchor: self.diff_base_anchor.map(|a| {
135 if let Some(base_text) = snapshot
136 .diffs
137 .get(&excerpt.buffer_id)
138 .map(|diff| diff.base_text())
139 {
140 if a.buffer_id == Some(base_text.remote_id()) {
141 return a.bias_right(&base_text);
142 }
143 }
144 a
145 }),
146 };
147 }
148 }
149 *self
150 }
151
152 pub fn summary<D>(&self, snapshot: &MultiBufferSnapshot) -> D
153 where
154 D: TextDimension + Ord + Sub<D, Output = D>,
155 {
156 snapshot.summary_for_anchor(self)
157 }
158
159 pub fn is_valid(&self, snapshot: &MultiBufferSnapshot) -> bool {
160 if *self == Anchor::min() || *self == Anchor::max() {
161 true
162 } else if let Some(excerpt) = snapshot.excerpt(self.excerpt_id) {
163 excerpt.contains(self)
164 && (self.text_anchor == excerpt.range.context.start
165 || self.text_anchor == excerpt.range.context.end
166 || self.text_anchor.is_valid(&excerpt.buffer))
167 } else {
168 false
169 }
170 }
171}
172
173impl ToOffset for Anchor {
174 fn to_offset(&self, snapshot: &MultiBufferSnapshot) -> usize {
175 self.summary(snapshot)
176 }
177}
178
179impl ToOffsetUtf16 for Anchor {
180 fn to_offset_utf16(&self, snapshot: &MultiBufferSnapshot) -> OffsetUtf16 {
181 self.summary(snapshot)
182 }
183}
184
185impl ToPoint for Anchor {
186 fn to_point<'a>(&self, snapshot: &MultiBufferSnapshot) -> Point {
187 self.summary(snapshot)
188 }
189}
190
191pub trait AnchorRangeExt {
192 fn cmp(&self, other: &Range<Anchor>, buffer: &MultiBufferSnapshot) -> Ordering;
193 fn includes(&self, other: &Range<Anchor>, buffer: &MultiBufferSnapshot) -> bool;
194 fn overlaps(&self, other: &Range<Anchor>, buffer: &MultiBufferSnapshot) -> bool;
195 fn to_offset(&self, content: &MultiBufferSnapshot) -> Range<usize>;
196 fn to_point(&self, content: &MultiBufferSnapshot) -> Range<Point>;
197}
198
199impl AnchorRangeExt for Range<Anchor> {
200 fn cmp(&self, other: &Range<Anchor>, buffer: &MultiBufferSnapshot) -> Ordering {
201 match self.start.cmp(&other.start, buffer) {
202 Ordering::Equal => other.end.cmp(&self.end, buffer),
203 ord => ord,
204 }
205 }
206
207 fn includes(&self, other: &Range<Anchor>, buffer: &MultiBufferSnapshot) -> bool {
208 self.start.cmp(&other.start, &buffer).is_le() && other.end.cmp(&self.end, &buffer).is_le()
209 }
210
211 fn overlaps(&self, other: &Range<Anchor>, buffer: &MultiBufferSnapshot) -> bool {
212 self.end.cmp(&other.start, buffer).is_ge() && self.start.cmp(&other.end, buffer).is_le()
213 }
214
215 fn to_offset(&self, content: &MultiBufferSnapshot) -> Range<usize> {
216 self.start.to_offset(content)..self.end.to_offset(content)
217 }
218
219 fn to_point(&self, content: &MultiBufferSnapshot) -> Range<Point> {
220 self.start.to_point(content)..self.end.to_point(content)
221 }
222}
223
224#[derive(Clone, Copy, Eq, PartialEq, Debug, Hash, Ord, PartialOrd)]
225pub struct Offset(pub usize);