1 files changed, 96 insertions, 0 deletions

diff --git a/src/position.rs b/src/position.rs
new file mode 100644
index 0000000..24f5309
--- /dev/null
+++ b/src/position.rs
@@ -0,0 +1,96 @@
+use std::fmt;
+use std::cmp::Ordering;
+
+#[derive(Copy,Clone)]
+pub struct Position {
+    pub line: u32,
+    pub column: u32,
+}
+
+impl Position {
+    pub fn new( line: u32, column: u32 ) -> Self {
+        Self {
+            line, column,
+        }
+    }
+
+    pub fn none() -> Self {
+        Self {
+            line: 0,
+            column: 0,
+        }
+    }
+
+    pub fn is_none(&self) -> bool {
+        self.line == 0 || self.column == 0
+    }
+}
+
+impl fmt::Debug for Position {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        if self.is_none() {
+            write!(f, "none")
+        } else {
+            write!(f, "{}:{}", self.line, self.column )
+        }
+    }
+}
+
+impl PartialOrd for Position {
+    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
+        let ord = self.line.partial_cmp( &other.line );
+        if Some(Ordering::Equal) == ord {
+            self.column.partial_cmp( &other.column )
+        } else {
+            ord
+        }
+    }
+}
+
+impl Ord for Position {
+    fn cmp(&self, other: &Self) -> Ordering {
+        let ord = self.line.cmp( &other.line );
+        if Ordering::Equal == ord {
+            self.column.cmp( &other.column )
+        } else {
+            ord
+        }
+    }
+}
+
+impl PartialEq for Position {
+    fn eq(&self, other: &Self) -> bool {
+        self.line == other.line && self.column == other.column
+    }
+}
+
+impl Eq for Position {}
+
+#[derive(Copy,Clone)]
+pub struct Range {
+    start: Position,
+    end: Position,
+}
+
+impl Range {
+    pub fn new( start: Position, end: Position ) -> Self {
+        Self {
+            start, end,
+        }
+    }
+
+    pub fn include(&mut self, pos: &Position ) {
+        if *pos < self.start {
+            self.start = pos.clone();
+        }
+        if *pos > self.end {
+            self.end = pos.clone();
+        }
+    }
+}
+
+impl fmt::Debug for Range {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "{:?}-{:?}", self.start, self.end )
+    }
+}