Modify changes from budokans's PR to limit conversion of "--" to ' - …

…' to only occasions when the original character was an em dash.

CHANGELOG.md

@@ -1,5 +1,9 @@
 # Change Log
 
+## 1.0.3
+
+* Special handling for em dashes: In smart spacing mode, em dashes become " - " instead of "--" when found between words.
+
 ## 1.0.2
 
 * German mode now works with combining umlaut (diaeresis).

package.json

@@ -9,7 +9,7 @@
     "transliteration",
     "emoji"
   ],
-  "version": "1.0.2",
+  "version": "1.0.3",
   "dependencies": {},
   "repository": "https://github.com/kshetline/unidecode-plus.git",
   "author": "Kerry Shetline <kerry@shetline.com>",

test/unidecode.mocha.js

@@ -81,6 +81,13 @@ describe('Smart spacing', function() {
   it('should replace an em-dash straddled by word characters with " - " instead of "--"', function() {
     assert.equal(
       unidecode("No—I mean yes!", { smartSpacing: true }), "No - I mean yes!");
+    assert.equal(
+      unidecode("#—#", { smartSpacing: true }), "#--#");
+  });
+
+  it('should leave ASCII double dashes unchanged', function() {
+    assert.equal(
+      unidecode("No--I mean yes!", { smartSpacing: true }), "No--I mean yes!");
   });
 
   it('should handle deferred smart spacing', function() {

unidecode.js

@@ -69,6 +69,7 @@ function unidecode_internal_replace(ch) {
   var high = cp >> 8;
   var row = high + (high === 0 && german ? 0.5 : 0);
   var low = cp & 0xFF;
+  var emDash = cp === 0x2014;
   // This doesn't cover all emoji, just those currently defined.
   var emoji = (high === 0x1F4 || high === 0x1F6 || high === 0x1F9);
 
@@ -96,6 +97,8 @@ function unidecode_internal_replace(ch) {
 
   ch = tr[row][low];
 
+  if (smartSpacing && emDash)
+    return '\x80--\x80';
   if (!smartSpacing || ch === '[?]' || ch === '_' || /^\w+$/.test(ch))
     return ch;
   else if (emoji)
@@ -106,13 +109,13 @@ function unidecode_internal_replace(ch) {
 
 function resolveSpacing(str) {
   return str
+    .replace(/(\w)(\x80--\x80)(\w)/g, function(_, p1, _2, p3) { return p1 + ' - ' + p3; })
     .replace(/\x80(?!\w)/g, "")
     .replace(/\x80\x80|(\w)\x80/g, "$1\x81")
     .replace(/\x80/g, "")
     .replace(/^\x81+|\x81+$/g, "")
     .replace(/\x81 \x81/g, "  ")
-    .replace(/\s?\x81+/g, " ")
-    .replace(/(\w)(--)(\w)/g, (_, p1, _2, p3) => `${p1} - ${p3}`);
+    .replace(/\s?\x81+/g, " ");
 }
 
 module.exports.resolveSpacing = resolveSpacing;