all: implement cell formatting

One of the most hardest task to finished after inline markup. It take
three refactoring until we get the current implementation.

To make the cell formatting works, we breaking down all table contents
into cells.  When parsing a cells, we lookup the content before '|' and
after '\n'. If its a valid cell format, it will be set as cell format
for the next cell, otherwise it will considered as normal text.

1 files changed, 36 insertions, 1 deletions

diff --git a/testdata/test.adoc b/testdata/test.adoc
index c700e90..34cb642 100644
--- a/testdata/test.adoc
+++ b/testdata/test.adoc
@@ -542,7 +542,11 @@ With row columns less than header,
 
 | C
 
-| D | E
+D
+
+E
+
+| F | G
 |===
 
 With row columns greater than header,
@@ -588,6 +592,37 @@ With column styles,
 |Asciidoc | emphasis | header | literal | mono | default | strong | verse
 |===
 
+===  Cell formatting
+
+Cell duplicated across three columns,
+
+|===
+
+|A1 |B1 |C1
+
+3*|A2-B2-C2
+
+|A3
+|B3
+|C3
+
+|===
+
+
+Cell spanning three columns,
+
+|===
+
+|A1 |B1 |C1
+
+3+|A2...C2
+
+|A3
+|B3
+|C3
+
+|===
+
 
 ==  Horizontal rules