Change parser

1 files changed, 15 insertions, 0 deletions

diff --git a/src/syntax/span.rs b/src/syntax/span.rs
index bfb9e755..ee7cba4c 100644
--- a/src/syntax/span.rs
+++ b/src/syntax/span.rs
@@ -109,6 +109,11 @@ impl Span {
         *self = self.join(other)
     }
 
+    /// Test whether a position is within the span.
+    pub fn contains_pos(&self, pos: Pos) -> bool {
+        self.start <= pos && self.end >= pos
+    }
+
     /// Test whether one span complete contains the other span.
     pub fn contains(self, other: Self) -> bool {
         self.source == other.source && self.start <= other.start && self.end >= other.end
@@ -118,6 +123,16 @@ impl Span {
     pub fn to_range(self) -> Range<usize> {
         self.start.to_usize() .. self.end.to_usize()
     }
+
+    /// A new span at the position of this span's start.
+    pub fn at_start(&self) -> Span {
+        Self::at(self.source, self.start)
+    }
+
+    /// A new span at the position of this span's end.
+    pub fn at_end(&self) -> Span {
+        Self::at(self.source, self.end)
+    }
 }
 
 impl Debug for Span {