From 8140e3c5e6d110dfed72b533bdf4e0b0be853ef0 Mon Sep 17 00:00:00 2001
From: Eryn Wells <eryn@erynwells.me>
Date: Sat, 24 Dec 2016 09:17:08 -0700
Subject: [PATCH] Pass over whitespace and count lines

---
 src/lexer/char.rs | 5 +++++
 src/lexer/mod.rs  | 8 ++++++++
 2 files changed, 13 insertions(+)

diff --git a/src/lexer/char.rs b/src/lexer/char.rs
index 3ef608f..42e5f7e 100644
--- a/src/lexer/char.rs
+++ b/src/lexer/char.rs
@@ -10,6 +10,7 @@ pub trait Lexable {
     fn is_identifier_initial(&self) -> bool;
     fn is_identifier_subsequent(&self) -> bool;
     fn is_identifier_single(&self) -> bool;
+    fn is_newline(&self) -> bool;
 }
 
 impl Lexable for char {
@@ -32,5 +33,9 @@ impl Lexable for char {
     fn is_identifier_single(&self) -> bool {
         charset::identifier_singles().contains(&self)
     }
+
+    fn is_newline(&self) -> bool {
+        *self == '\n'
+    }
 }
 
diff --git a/src/lexer/mod.rs b/src/lexer/mod.rs
index e64f5fa..793de3d 100644
--- a/src/lexer/mod.rs
+++ b/src/lexer/mod.rs
@@ -22,6 +22,7 @@ pub struct Lexer {
     input: String,
     begin: usize,
     forward: usize,
+    line: u32,
     state: State,
 }
 
@@ -31,6 +32,7 @@ impl Lexer {
             input: input,
             begin: 0,
             forward: 0,
+            line: 1,
             state: State::Initial,
         }
     }
@@ -83,6 +85,12 @@ impl Lexer {
             self.state = State::Identifier;
             self.advance();
         }
+        else if c.is_whitespace() {
+            if c.is_newline() {
+                self.line += 1;
+            }
+            self.advance();
+        }
     }
 
     /// Handle self.state == State::Identifier