From a8f711d49ad65ee08c96fae2a8b52873667bdf5c Mon Sep 17 00:00:00 2001
From: Laurenz <laurmaedje@gmail.com>
Date: Mon, 13 Jan 2020 11:26:42 +0100
Subject: =?UTF-8?q?Checkpoint=20=F0=9F=8F=81?=
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---
 src/syntax/span.rs | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

(limited to 'src/syntax/span.rs')

diff --git a/src/syntax/span.rs b/src/syntax/span.rs
index 9bf7cafb..10188ed4 100644
--- a/src/syntax/span.rs
+++ b/src/syntax/span.rs
@@ -19,7 +19,11 @@ impl<T> Spanned<T> {
         self.v
     }
 
-    pub fn map<V>(&self, new_v: V) -> Spanned<V> {
+    pub fn map<F, V>(self, f: F) -> Spanned<V> where F: FnOnce(T) -> V {
+        Spanned { v: f(self.v), span: self.span }
+    }
+
+    pub fn map_v<V>(&self, new_v: V) -> Spanned<V> {
         Spanned { v: new_v, span: self.span }
     }
 }
@@ -40,6 +44,8 @@ pub struct Span {
 }
 
 impl Span {
+    pub const ZERO: Span = Span { start: Position::ZERO, end: Position::ZERO };
+
     pub fn new(start: Position, end: Position) -> Span {
         Span { start, end }
     }
@@ -78,6 +84,8 @@ pub struct Position {
 }
 
 impl Position {
+    pub const ZERO: Position = Position { line: 0, column: 0 };
+
     pub fn new(line: usize, column: usize) -> Position {
         Position { line, column }
     }
-- 
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