From d45d78086934740645a1905ac9b8c56fd484383a Mon Sep 17 00:00:00 2001
From: Geoffrey Booth <webmaster@geoffreybooth.com>
Date: Sat, 3 Dec 2016 10:16:41 -0800
Subject: [PATCH] Improve tests and comments

---
 src/nodes.coffee                     | 4 ++--
 test/tagged_template_literals.coffee | 9 ++++++---
 2 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/src/nodes.coffee b/src/nodes.coffee
index 71e32a02..962b5803 100644
--- a/src/nodes.coffee
+++ b/src/nodes.coffee
@@ -2274,8 +2274,8 @@ exports.StringWithInterpolations = class StringWithInterpolations extends Parens
     fragments.push @makeCode '`'
     for element in elements
       if element instanceof StringLiteral
-        value = element.value.slice(1, -1)
-        # Backticks or `${` inside template literals must be escaped
+        value = element.value[1...-1]
+        # Backticks and `${` inside template literals must be escaped.
         value = value.replace /(\\*)(`|\$\{)/g, (match, backslashes, toBeEscaped) ->
           if backslashes.length % 2 is 0
             "#{backslashes}\\#{toBeEscaped}"
diff --git a/test/tagged_template_literals.coffee b/test/tagged_template_literals.coffee
index a5163f2a..92cccf5a 100644
--- a/test/tagged_template_literals.coffee
+++ b/test/tagged_template_literals.coffee
@@ -146,7 +146,7 @@ test "tagged template literal with escaped backticks", ->
   eq 'text: [ES template literals look like this: \\`foo bar\\`] expressions: []',
   func"ES template literals look like this: \\`foo bar\\`"
 
-test "tagged template literal with invalidly escaped backticks", ->
+test "tagged template literal with unnecessarily escaped backticks", ->
   eq 'text: [ES template literals look like this: `foo bar`] expressions: []',
   func"ES template literals look like this: \`foo bar\`"
 
@@ -162,7 +162,10 @@ test "tagged template literal with escaped ES interpolation", ->
   eq 'text: [ES template literals also look like this: `3 + 5 = \\${3+5}`] expressions: []',
   func"ES template literals also look like this: `3 + 5 = \\${3+5}`"
 
-test "tagged template literal with invalidly escaped ES interpolation", ->
-  eq 'text: [ES template literals also look like this: `3 + 5 = \${3+5}`] expressions: []',
+test "tagged template literal with unnecessarily escaped ES interpolation", ->
+  eq 'text: [ES template literals also look like this: `3 + 5 = ${3+5}`] expressions: []',
   func"ES template literals also look like this: `3 + 5 = \${3+5}`"
 
+test "tagged template literal special escaping", ->
+  eq 'text: [` ` \\` \\` \\\\` $ { ${ ${ \\${ \\${ \\\\${ | ` ${] expressions: [1]',
+  func"` \` \\` \\\` \\\\` $ { ${ \${ \\${ \\\${ \\\\${ #{1} ` ${"