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authorNadrieril2020-03-31 20:25:02 +0100
committerGitHub2020-03-31 20:25:02 +0100
commit5a5aa49e64197899006751db72e404f4b2292d4e (patch)
tree0b62e961c1de99ce9a78c4775ce8eab047cdf768 /dhall/src/syntax/ast
parenteecd41fe5dd155752aaaa06af02bc32f8a416ba5 (diff)
parente12fb2928307d240461e749e5d371cef17cf520c (diff)
Merge pull request #156 from Nadrieril/fix-155
Fix #155
Diffstat (limited to 'dhall/src/syntax/ast')
-rw-r--r--dhall/src/syntax/ast/span.rs20
1 files changed, 8 insertions, 12 deletions
diff --git a/dhall/src/syntax/ast/span.rs b/dhall/src/syntax/ast/span.rs
index 153a624..2e09863 100644
--- a/dhall/src/syntax/ast/span.rs
+++ b/dhall/src/syntax/ast/span.rs
@@ -75,19 +75,15 @@ impl Span {
}
/// Convert a byte idx into a string into a char idx for consumption by annotate_snippets.
+/// The byte idx must be at a char boundary.
fn char_idx_from_byte_idx(input: &str, idx: usize) -> usize {
- let char_idx = input
+ use std::iter::once;
+ input
.char_indices()
+ .map(|(byte_i, _)| byte_i) // We don't care about the char
+ .chain(once(input.len())) // In case the idx points to the end of the string
.enumerate()
- .find(|(_, (i, _))| *i == idx)
- .map(|(i, (_, _))| i)
- // We should be able to unwrap() here, but somehow it panics on an example from
- // serde_dhall/lib.rs...
- .unwrap_or(0);
- // Unix-style newlines are counted as two chars (see
- // https://github.com/rust-lang/annotate-snippets-rs/issues/24).
- let nbr_newlines = input[..idx].chars().filter(|c| *c == '\n').count();
- let nbr_carriage_returns =
- input[..idx].chars().filter(|c| *c == '\r').count();
- char_idx + nbr_newlines - nbr_carriage_returns
+ .find(|(_, byte_i)| *byte_i == idx)
+ .map(|(char_i, _)| char_i)
+ .unwrap()
}