8 files changed, 18 insertions, 153 deletions

diff --git a/Cargo.toml b/Cargo.toml
index 622abcc42..954f3e94b 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -9,6 +9,7 @@ members = [ "tools" ]
 
 [dependencies]
 unicode-xid = "0.1.0"
+text_unit = "0.1.1"
 
 [dev-dependencies]
 testutils = { path = "./tests/testutils" }
diff --git a/src/lexer/ptr.rs b/src/lexer/ptr.rs
index 99d55b283..d1391fd5f 100644
--- a/src/lexer/ptr.rs
+++ b/src/lexer/ptr.rs
@@ -11,7 +11,7 @@ impl<'s> Ptr<'s> {
     pub fn new(text: &'s str) -> Ptr<'s> {
         Ptr {
             text,
-            len: TextUnit::new(0),
+            len: 0.into(),
         }
     }
 
@@ -47,7 +47,7 @@ impl<'s> Ptr<'s> {
 
     pub fn bump(&mut self) -> Option<char> {
         let ch = self.chars().next()?;
-        self.len += TextUnit::len_of_char(ch);
+        self.len += TextUnit::of_char(ch);
         Some(ch)
     }
 
diff --git a/src/lib.rs b/src/lib.rs
index 153458644..b90b70c05 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -16,14 +16,14 @@
 //#![warn(unreachable_pub)] // rust-lang/rust#47816
 
 extern crate unicode_xid;
+extern crate text_unit;
 
-mod text;
 mod tree;
 mod lexer;
 mod parser;
 
 pub mod syntax_kinds;
-pub use text::{TextRange, TextUnit};
+pub use text_unit::{TextRange, TextUnit};
 pub use tree::{File, Node, SyntaxKind, Token};
 pub(crate) use tree::{ErrorMsg, FileBuilder, Sink};
 pub use lexer::{next_token, tokenize};
diff --git a/src/parser/event.rs b/src/parser/event.rs
index 1c0905a38..ac8a55de9 100644
--- a/src/parser/event.rs
+++ b/src/parser/event.rs
@@ -1,5 +1,7 @@
-use {ErrorMsg, File, FileBuilder, Sink, SyntaxKind, TextUnit, Token};
-use syntax_kinds::TOMBSTONE;
+use {
+    ErrorMsg, File, FileBuilder, Sink, SyntaxKind, Token,
+    syntax_kinds::TOMBSTONE,
+};
 use super::is_insignificant;
 
 /// `Parser` produces a flat list of `Event`s.
@@ -133,7 +135,7 @@ pub(super) fn to_file(text: String, tokens: &[Token], events: Vec<Event>) -> Fil
                     builder.leaf(token.kind, token.len);
                     idx += 1
                 }
-                let mut len = TextUnit::new(0);
+                let mut len = 0.into();
                 for _ in 0..n_raw_tokens {
                     len += tokens[idx].len;
                     idx += 1;
diff --git a/src/parser/input.rs b/src/parser/input.rs
index 13589467b..9b400b959 100644
--- a/src/parser/input.rs
+++ b/src/parser/input.rs
@@ -14,7 +14,7 @@ impl<'t> ParserInput<'t> {
     pub fn new(text: &'t str, raw_tokens: &'t [Token]) -> ParserInput<'t> {
         let mut tokens = Vec::new();
         let mut start_offsets = Vec::new();
-        let mut len = TextUnit::new(0);
+        let mut len = 0.into();
         for &token in raw_tokens.iter() {
             if !is_insignificant(token.kind) {
                 tokens.push(token);
@@ -44,7 +44,7 @@ impl<'t> ParserInput<'t> {
         if !(idx < self.tokens.len()) {
             return "";
         }
-        let range = TextRange::from_len(self.start_offsets[idx], self.tokens[idx].len);
+        let range = TextRange::offset_len(self.start_offsets[idx], self.tokens[idx].len);
         &self.text[range]
     }
 }
diff --git a/src/text.rs b/src/text.rs
deleted file mode 100644
index 4084bf44e..000000000
--- a/src/text.rs
+++ /dev/null
@@ -1,136 +0,0 @@
-use std::fmt;
-use std::ops;
-
-/// An text position in a source file
-#[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
-pub struct TextUnit(u32);
-
-impl TextUnit {
-    /// The positional offset required for one character
-    pub fn len_of_char(c: char) -> TextUnit {
-        TextUnit(c.len_utf8() as u32)
-    }
-
-    #[allow(missing_docs)]
-    pub fn new(val: u32) -> TextUnit {
-        TextUnit(val)
-    }
-}
-
-impl fmt::Debug for TextUnit {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        <Self as fmt::Display>::fmt(self, f)
-    }
-}
-
-impl fmt::Display for TextUnit {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        self.0.fmt(f)
-    }
-}
-
-impl From<TextUnit> for u32 {
-    fn from(tu: TextUnit) -> u32 {
-        tu.0
-    }
-}
-
-impl From<u32> for TextUnit {
-    fn from(tu: u32) -> TextUnit {
-        TextUnit::new(tu)
-    }
-}
-
-impl ops::Add<TextUnit> for TextUnit {
-    type Output = TextUnit;
-    fn add(self, rhs: TextUnit) -> TextUnit {
-        TextUnit(self.0 + rhs.0)
-    }
-}
-
-impl ops::AddAssign<TextUnit> for TextUnit {
-    fn add_assign(&mut self, rhs: TextUnit) {
-        self.0 += rhs.0
-    }
-}
-
-impl ops::Sub<TextUnit> for TextUnit {
-    type Output = TextUnit;
-    fn sub(self, rhs: TextUnit) -> TextUnit {
-        TextUnit(self.0 - rhs.0)
-    }
-}
-
-impl ops::SubAssign<TextUnit> for TextUnit {
-    fn sub_assign(&mut self, rhs: TextUnit) {
-        self.0 -= rhs.0
-    }
-}
-
-/// A range of text in a source file
-#[derive(Clone, Copy, PartialEq, Eq)]
-pub struct TextRange {
-    start: TextUnit,
-    end: TextUnit,
-}
-
-impl fmt::Debug for TextRange {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        <Self as fmt::Display>::fmt(self, f)
-    }
-}
-
-impl fmt::Display for TextRange {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        write!(f, "[{}; {})", self.start(), self.end())
-    }
-}
-
-impl TextRange {
-    /// An length-0 range of text
-    pub fn empty() -> TextRange {
-        TextRange::from_to(TextUnit::new(0), TextUnit::new(0))
-    }
-
-    /// The left-inclusive range (`[from..to)`) between to points in the text
-    pub fn from_to(from: TextUnit, to: TextUnit) -> TextRange {
-        assert!(from <= to, "Invalid text range [{}; {})", from, to);
-        TextRange {
-            start: from,
-            end: to,
-        }
-    }
-
-    /// The range from some point over some length
-    pub fn from_len(from: TextUnit, len: TextUnit) -> TextRange {
-        TextRange::from_to(from, from + len)
-    }
-
-    /// The starting position of this range
-    pub fn start(&self) -> TextUnit {
-        self.start
-    }
-
-    /// The end position of this range
-    pub fn end(&self) -> TextUnit {
-        self.end
-    }
-
-    /// The length of this range
-    pub fn len(&self) -> TextUnit {
-        self.end - self.start
-    }
-
-    /// Is this range empty of any content?
-    pub fn is_empty(&self) -> bool {
-        self.start() == self.end()
-    }
-}
-
-impl ops::Index<TextRange> for str {
-    type Output = str;
-
-    fn index(&self, index: TextRange) -> &str {
-        &self[index.start().0 as usize..index.end().0 as usize]
-    }
-}
diff --git a/src/tree/file_builder.rs b/src/tree/file_builder.rs
index f831676c7..712602168 100644
--- a/src/tree/file_builder.rs
+++ b/src/tree/file_builder.rs
@@ -31,7 +31,7 @@ impl Sink for FileBuilder {
     fn leaf(&mut self, kind: SyntaxKind, len: TextUnit) {
         let leaf = NodeData {
             kind,
-            range: TextRange::from_len(self.pos, len),
+            range: TextRange::offset_len(self.pos, len),
             parent: None,
             first_child: None,
             next_sibling: None,
@@ -44,7 +44,7 @@ impl Sink for FileBuilder {
     fn start_internal(&mut self, kind: SyntaxKind) {
         let node = NodeData {
             kind,
-            range: TextRange::from_len(self.pos, 0.into()),
+            range: TextRange::offset_len(self.pos, 0.into()),
             parent: None,
             first_child: None,
             next_sibling: None,
@@ -83,7 +83,7 @@ impl FileBuilder {
             nodes: Vec::new(),
             errors: Vec::new(),
             in_progress: Vec::new(),
-            pos: TextUnit::new(0),
+            pos: 0.into(),
         }
     }
 
diff --git a/src/tree/mod.rs b/src/tree/mod.rs
index ebf26777b..f7b16d7b5 100644
--- a/src/tree/mod.rs
+++ b/src/tree/mod.rs
@@ -1,9 +1,7 @@
-use text::{TextRange, TextUnit};
-
-use std::fmt;
-use std::cmp;
-
 mod file_builder;
+
+use ::{TextRange, TextUnit};
+use std::{fmt, cmp};
 pub(crate) use self::file_builder::{ErrorMsg, FileBuilder, Sink};
 
 pub use syntax_kinds::SyntaxKind;