feat(single): Support for original markdown specification

2 files changed, 153 insertions, 35 deletions

diff --git a/demo/src/index.md b/demo/src/index.md
index 523a9c3..446763c 100644
--- a/demo/src/index.md
+++ b/demo/src/index.md
@@ -4,15 +4,44 @@ This is a demo webpage, made with [csg](https://gitlab.com/Syndamia/csg).
 
 This is a regular paragraph.
 
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit.
+Aliquam sed erat velit.
+Curabitur eu interdum libero, ac porttitor mi.
+Aliquam tempor sem at nunc pharetra euismod.
+In finibus euismod lacus, a gravida lectus egestas eu.
+Etiam molestie lacus sit amet elementum scelerisque.
+In id venenatis justo.
+Fusce feugiat vestibulum venenatis.
+Curabitur vitae lacinia enim.
+
+Nullam vel ultrices turpis.
+Suspendisse ut tempor ligula.
+Suspendisse eu orci mattis odio vulputate laoreet ac accumsan tortor.
+Vestibulum et tristique enim.
+Vestibulum aliquam elit at massa tristique maximus eu rutrum neque.
+<table>
+    <tr>
+        <td>Foo</td>
+    </tr>
+</table>
+Curabitur placerat, dui eu laoreet ultrices, ante massa consectetur erat, non lacinia est augue a justo.
+Sed euismod viverra turpis in auctor.
+
 <table>
     <tr>
         <td>Foo</td>
     </tr>
 </table>
 
+
+Curabitur placerat, dui eu <b>laoreet</b> ultrices, ante *massa* consectetur **erat**, non *<b>lacinia</b>* est augue a justo.
+
 This is another regular paragraph.
 
-&copy; AT&T 4 < 5
+&copy; AT&T 4 < 5 4 <5 4< 5
+
+    &copy; AT&T 4 < 5 4 <5 4< 5
 
 This is an H1
 =============
@@ -40,6 +69,8 @@ This is an H2
 
 > > a
 
+> >a
+
 > This is the first level of quoting.
 >
 > > This is nested blockquote.
@@ -62,6 +93,43 @@ id sem consectetuer libero luctus adipiscing.
 >
 >     return shell_exec("echo $input | $markdown_script");
 
+    ## Header
+
+    *Emphasis* line with **bold** text too.
+
+    * Item 1
+    * Item 2
+
+    > Quote here
+
+    Header 1
+    ========
+
+Text
+
+    ## Header
+text
+
+    <div class="footer">
+        &copy; 2004 Foo Corporation
+    </div>
+
+---
+
+- - -
+
+- - - -
+
+-- -
+
+***
+
+* * *
+
+___
+
+_ _ _
+
 *single asterisks*
 
 _single underscores_
@@ -88,24 +156,85 @@ un*frigging*believable
 
   **World**
 
++ One
+
+- Two
+  <div class="footer">
+    &copy; 2004 Foo Corporation
+  </div>
+
+* Three
+
+* Three1
+* Three 2
+
+* Three 3
+  A
+  B
+
+  C
+  D
+* Three 4
+
+Paragraph here
+
+* List item starts here
+and continues here
+  + sublist start
+  with continuation
+  + and second
+  addition
+
+101. Similarly starts here
+     and continues here
+    But stops here
+
+
++ List item
+
+    Code block is inside the list!
+
+  + Sublist
+    + Subsublist
+        Code block is inside the subsublist
+
+  * List item starts here
+    and continues here
+   and continues here
+  and continues here
+
+Stop lists
+
+1986. What a great season.
+
+1986\. What a great season.
+
 This is [an example](http://example.com/ "Title") inline link.
 
 [This link](http://example.net/) has no title attribute.
 
 See my [About](/about/) page for details.   
 
-This is __a__ itali__cised__ text
+This is __an__ itali__cised__ text
+Equation a * b * c _ d _ e * f * g _ h _ i
 
-x~2~^e^ = y^някоя си^~търсно то~
+x~2~^e^ = y^някоя си^~~търсно то~~
 : **Common** [programmer](https://wikipedia.org "Me") phrase
 
+some
+: def
+
 Lorem `ipsum` dolor tiada ad;l ``kfj `skigj`` jjsa
 
 ![](https://syndamia.com/favicon.ico) ![](https://syndamia.com/favicon.ico "Hello") ![World](https://syndamia.com/favicon.ico) ![Hello](https://syndamia.com/favicon.ico "World")
 
+- [ ] Standalone 1
+
 - [ ] *A*
 - [x] **B**
 
+- [ ] Standalone 2
+
 [me]: https://syndamia.com
 
 Some links: [Google][], [this is a page about me][me]
@@ -114,4 +243,16 @@ Some links: [Google][], [this is a page about me][me]
 
 ![Picture of me][mepic]
 
+    ![Picture of me][mepic]
+
 [mepic]: https://syndamia.com/img/face.jpeg (Photo of myself)
+
+[[a](/a)](/b)
+
+Escapes: \\ \` \* \_ \{ \} \[ \] \( \) \# \+ \- \. \!
+Normal text: \a \K \9 \, \@
+*em* \*nonem\* [Hello]\(world)
+
+Test <google.com> <http://example.com> <me@mail.com>
+
+Some esoteric mails: <"Hello World"@something.co.uk> <anything@[1.2.3.4]> <long.john@[2001:0db8:85a3:0000:0000:8a2e:0370:7334]>
diff --git a/single.awk b/single.awk
index 1e48ce7..7698bca 100644
--- a/single.awk
+++ b/single.awk
@@ -1,26 +1,10 @@
-# Status:
-# [.] Inline HTML
-# [x] Autoescape
-# [x] Block elements
-#     [x] Paragraph
-#     [x] Line break
-#     [x] Headers (atx and setex)
-#     [x] Blockquotes
-#     [x] Lists
-#     [x] Code blocks
-#     [x] Horizontal rules
-# [x] Span elements
-#     [x] Links
-#         [x] Inline
-#         [x] Reference
-#     [x] Emphasis
-#     [x] Code
-#     [x] Images
-#         [x] Inline
-#         [x] Reference
-# [x] Other
-#     [x] Autolinks
-#     [x] Escapes
+# Almost the entire canonical Markdown specification is supported
+# https://daringfireball.net/projects/markdown/syntax
+# Notable behavioural exceptions are:
+# - Block-level HTML elements needn't be separated with blank lines
+# - Lists are identation-aware. List items begin and continue after the same
+#   identation with which the list beginning (e.g. "* " or "5. ") was written.
+#   The benefit is that all Markdown is parsed as normal inside an item.
 #
 # [ ] Non-standard features
 #     [ ] Strikethrough ~~...~~
@@ -36,15 +20,8 @@
 #     [ ] Links
 #         [ ] Link destination (<link> inside anchors)
 #         [ ] Nested links
-# No character classes, since they aren't supported on every system
 #
-# Limitations:
-# - definition lists always contain one element, i.e. multiple definitions
-#   aren't merged into the same list
-# - emphasis which isn't surrounded by blanks is still treated as emphasis
-#   e.g. "some_text_here" will become "some<em>text</em>here"
-# - emphasis inside inline code block is still converted to HTML
-# - backticks inside `` emphasis blocks aren't escaped
+# No character classes have been used, since they aren't supported on every system
 
 function empty(value) {
 	return value == ""
@@ -108,7 +85,7 @@ BEGIN {
 }
 
 # Output is buffered on multiple lines, held in these variables:
-# P2 = previous non-empty line
+# P2 = last non-empty line before the previous line
 # P1 = previous line
 # $0 = current line
 # N1 = next new line (N1 is always set by the user)