feat!: replace em-dash's current replacement with en-dash. add em-dash as --

Author: iamgio

quarkdown-core/src/main/kotlin/com/quarkdown/core/lexer/patterns/TextSymbolReplacement.kt

@@ -28,11 +28,16 @@ enum class TextSymbolReplacement(
     TRADEMARK('™', "\\(TM\\)".toRegex()),
 
     /**
-     * `-` -> `—`
+     * `--` -> `—`
+     */
+    EM_DASH('—', "--".toRegex()),
+
+    /**
+     * `-` -> `–`
      *
      * It must be surrounded by a word character and a space on both sides.
      */
-    EM_DASH('—', "(?<=\\w\\s)-(?=\\s\\w)".toRegex()),
+    EN_DASH('–', "(?<=\\w\\s)-(?=\\s\\w)".toRegex()),
 
     /**
      * `...` -> `…`

quarkdown-core/src/test/kotlin/com/quarkdown/core/LexerTest.kt

@@ -394,6 +394,8 @@ class LexerTest {
         assertIs<PlainTextToken>(tokens.next())
         assertSymbolEquals(TextSymbolReplacement.SINGLE_LEFT_ARROW)
         assertIs<PlainTextToken>(tokens.next())
+        assertSymbolEquals(TextSymbolReplacement.EN_DASH)
+        assertIs<PlainTextToken>(tokens.next())
         assertSymbolEquals(TextSymbolReplacement.ELLIPSIS)
         assertIs<PlainTextToken>(tokens.next()) // Soft line break
         assertSymbolEquals(TextSymbolReplacement.TYPOGRAPHIC_LEFT_APOSTROPHE)

quarkdown-core/src/test/resources/lexing/textreplacement.md

@@ -1,4 +1,4 @@
-Hi... this is some text lexed by the Quarkdown (C) flavor - the Turing complete Markdown - which is iamgio's project.
-3-1 is 2, which is not 4 => 2 != 4 -> also, 4 <= 8, and 8 >= 4 <- interesting...
+Hi... this is some text lexed by the Quarkdown (C) flavor--the Turing-complete Markdown -- which is iamgio's project.
+3-1 is 2, which is not 4 => 2 != 4 -> also, 4 <= 8, and 8 >= 4 <- interesting - I should do something about it...
 'Quarkdown's' source is available on 'GitHub'! "Stars" are much appreciated (TM)
 This is a "test".

quarkdown-test/src/test/kotlin/com/quarkdown/test/TextTest.kt

@@ -66,14 +66,15 @@ class TextTest {
         execute(
             """
             > This is a **"quote"** with 'text *replacement*'.  
-            > This is a feature of Quarkdown - the Turing complete Markdown - by iamgio (C) 2024.
+            > This is a feature of Quarkdown--the Turing complete Markdown--by iamgio (C) 2024 - all rights reserved.
             > => Quarkdown != other Markdown flavors... <-
             """.trimIndent(),
         ) {
             assertEquals(
                 "<blockquote><p>" +
                     "This is a <strong>&ldquo;quote&rdquo;</strong> with &lsquo;text <em>replacement</em>&rsquo;.<br />" +
-                    "This is a feature of Quarkdown &mdash; the Turing complete Markdown &mdash; by iamgio &copy; 2024.\n" +
+                    "This is a feature of Quarkdown&mdash;the Turing complete Markdown&mdash;by iamgio &copy; 2024 " +
+                    "&ndash; all rights reserved.\n" +
                     "&rArr; Quarkdown &ne; other Markdown flavors&hellip; &larr;" +
                     "</p></blockquote>",
                 it,