aboutsummaryrefslogtreecommitdiff
path: root/crates/ra_hir/src/ty
diff options
context:
space:
mode:
Diffstat (limited to 'crates/ra_hir/src/ty')
-rw-r--r--crates/ra_hir/src/ty/display.rs43
1 files changed, 39 insertions, 4 deletions
diff --git a/crates/ra_hir/src/ty/display.rs b/crates/ra_hir/src/ty/display.rs
index 7910429d7..9bb3ece6c 100644
--- a/crates/ra_hir/src/ty/display.rs
+++ b/crates/ra_hir/src/ty/display.rs
@@ -7,15 +7,30 @@ use crate::db::HirDatabase;
7pub struct HirFormatter<'a, 'b, DB> { 7pub struct HirFormatter<'a, 'b, DB> {
8 pub db: &'a DB, 8 pub db: &'a DB,
9 fmt: &'a mut fmt::Formatter<'b>, 9 fmt: &'a mut fmt::Formatter<'b>,
10 buf: String,
11 curr_size: usize,
12 max_size: Option<usize>,
10} 13}
11 14
12pub trait HirDisplay { 15pub trait HirDisplay {
13 fn hir_fmt(&self, f: &mut HirFormatter<impl HirDatabase>) -> fmt::Result; 16 fn hir_fmt(&self, f: &mut HirFormatter<impl HirDatabase>) -> fmt::Result;
17
14 fn display<'a, DB>(&'a self, db: &'a DB) -> HirDisplayWrapper<'a, DB, Self> 18 fn display<'a, DB>(&'a self, db: &'a DB) -> HirDisplayWrapper<'a, DB, Self>
15 where 19 where
16 Self: Sized, 20 Self: Sized,
17 { 21 {
18 HirDisplayWrapper(db, self) 22 HirDisplayWrapper(db, self, None)
23 }
24
25 fn display_truncated<'a, DB>(
26 &'a self,
27 db: &'a DB,
28 max_size: Option<usize>,
29 ) -> HirDisplayWrapper<'a, DB, Self>
30 where
31 Self: Sized,
32 {
33 HirDisplayWrapper(db, self, max_size)
19 } 34 }
20} 35}
21 36
@@ -41,11 +56,25 @@ where
41 56
42 /// This allows using the `write!` macro directly with a `HirFormatter`. 57 /// This allows using the `write!` macro directly with a `HirFormatter`.
43 pub fn write_fmt(&mut self, args: fmt::Arguments) -> fmt::Result { 58 pub fn write_fmt(&mut self, args: fmt::Arguments) -> fmt::Result {
44 fmt::write(self.fmt, args) 59 // We write to a buffer first to track output size
60 self.buf.clear();
61 fmt::write(&mut self.buf, args)?;
62 self.curr_size += self.buf.len();
63
64 // Then we write to the internal formatter from the buffer
65 self.fmt.write_str(&self.buf)
66 }
67
68 pub fn should_truncate(&self) -> bool {
69 if let Some(max_size) = self.max_size {
70 self.curr_size >= max_size
71 } else {
72 false
73 }
45 } 74 }
46} 75}
47 76
48pub struct HirDisplayWrapper<'a, DB, T>(&'a DB, &'a T); 77pub struct HirDisplayWrapper<'a, DB, T>(&'a DB, &'a T, Option<usize>);
49 78
50impl<'a, DB, T> fmt::Display for HirDisplayWrapper<'a, DB, T> 79impl<'a, DB, T> fmt::Display for HirDisplayWrapper<'a, DB, T>
51where 80where
@@ -53,6 +82,12 @@ where
53 T: HirDisplay, 82 T: HirDisplay,
54{ 83{
55 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { 84 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
56 self.1.hir_fmt(&mut HirFormatter { db: self.0, fmt: f }) 85 self.1.hir_fmt(&mut HirFormatter {
86 db: self.0,
87 fmt: f,
88 buf: String::with_capacity(20),
89 curr_size: 0,
90 max_size: self.2,
91 })
57 } 92 }
58} 93}