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-rw-r--r--crates/libsyntax2/src/algo/mod.rs13
-rw-r--r--crates/libsyntax2/src/lib.rs1
-rw-r--r--crates/libsyntax2/src/text_utils.rs19
3 files changed, 24 insertions, 9 deletions
diff --git a/crates/libsyntax2/src/algo/mod.rs b/crates/libsyntax2/src/algo/mod.rs
index 6efdff12f..2640d60ea 100644
--- a/crates/libsyntax2/src/algo/mod.rs
+++ b/crates/libsyntax2/src/algo/mod.rs
@@ -1,7 +1,10 @@
1pub mod walk; 1pub mod walk;
2pub mod visit; 2pub mod visit;
3 3
4use {SyntaxNodeRef, TextUnit, TextRange}; 4use {
5 SyntaxNodeRef, TextUnit, TextRange,
6 text_utils::{contains_offset_nonstrict, is_subrange},
7};
5 8
6pub fn find_leaf_at_offset(node: SyntaxNodeRef, offset: TextUnit) -> LeafAtOffset { 9pub fn find_leaf_at_offset(node: SyntaxNodeRef, offset: TextUnit) -> LeafAtOffset {
7 let range = node.range(); 10 let range = node.range();
@@ -116,14 +119,6 @@ fn common_ancestor<'a>(n1: SyntaxNodeRef<'a>, n2: SyntaxNodeRef<'a>) -> SyntaxNo
116 panic!("Can't find common ancestor of {:?} and {:?}", n1, n2) 119 panic!("Can't find common ancestor of {:?} and {:?}", n1, n2)
117} 120}
118 121
119fn contains_offset_nonstrict(range: TextRange, offset: TextUnit) -> bool {
120 range.start() <= offset && offset <= range.end()
121}
122
123fn is_subrange(range: TextRange, subrange: TextRange) -> bool {
124 range.start() <= subrange.start() && subrange.end() <= range.end()
125}
126
127fn generate<T>(seed: Option<T>, step: impl Fn(&T) -> Option<T>) -> impl Iterator<Item=T> { 122fn generate<T>(seed: Option<T>, step: impl Fn(&T) -> Option<T>) -> impl Iterator<Item=T> {
128 ::itertools::unfold(seed, move |slot| { 123 ::itertools::unfold(seed, move |slot| {
129 slot.take().map(|curr| { 124 slot.take().map(|curr| {
diff --git a/crates/libsyntax2/src/lib.rs b/crates/libsyntax2/src/lib.rs
index c078baa3a..53ae18988 100644
--- a/crates/libsyntax2/src/lib.rs
+++ b/crates/libsyntax2/src/lib.rs
@@ -39,6 +39,7 @@ mod syntax_kinds;
39mod yellow; 39mod yellow;
40/// Utilities for simple uses of the parser. 40/// Utilities for simple uses of the parser.
41pub mod utils; 41pub mod utils;
42pub mod text_utils;
42 43
43pub use { 44pub use {
44 text_unit::{TextRange, TextUnit}, 45 text_unit::{TextRange, TextUnit},
diff --git a/crates/libsyntax2/src/text_utils.rs b/crates/libsyntax2/src/text_utils.rs
new file mode 100644
index 000000000..e3d73888f
--- /dev/null
+++ b/crates/libsyntax2/src/text_utils.rs
@@ -0,0 +1,19 @@
1use {TextRange, TextUnit};
2
3pub fn contains_offset_nonstrict(range: TextRange, offset: TextUnit) -> bool {
4 range.start() <= offset && offset <= range.end()
5}
6
7pub fn is_subrange(range: TextRange, subrange: TextRange) -> bool {
8 range.start() <= subrange.start() && subrange.end() <= range.end()
9}
10
11pub fn intersect(r1: TextRange, r2: TextRange) -> Option<TextRange> {
12 let start = r1.start().max(r2.start());
13 let end = r1.end().min(r2.end());
14 if start <= end {
15 Some(TextRange::from_to(start, end))
16 } else {
17 None
18 }
19}