ConTeXt writer: Use xtables instead of Tables (#4223)

- Default to xtables for context output.
- Added `ntb` extension (affecting context writer only) to use Natural Tables instead.
- Added `Ext_ntb` constructor to `Extension` (API change).

4 files changed, 275 insertions, 155 deletions

diff --git a/test/Tests/Writers/ConTeXt.hs b/test/Tests/Writers/ConTeXt.hs
index 783b601a9..7145240e3 100644
--- a/test/Tests/Writers/ConTeXt.hs
+++ b/test/Tests/Writers/ConTeXt.hs
@@ -15,6 +15,9 @@ context = unpack . purely (writeConTeXt def) . toPandoc
 context' :: (ToPandoc a) => a -> String
 context' = unpack . purely (writeConTeXt def{ writerWrapText = WrapNone }) . toPandoc
 
+contextNtb :: (ToPandoc a) => a -> String
+contextNtb = unpack . purely (writeConTeXt def{ writerExtensions = enableExtension Ext_ntb pandocExtensions }) . toPandoc
+
 {-
   "my test" =: X =?> Y
 
@@ -68,5 +71,57 @@ tests = [ testGroup "inline code"
                 , "  \\stopitemize"
                 , "\\stopitemize" ]
           ]
+        , testGroup "natural tables"
+            [ test contextNtb "table with header and caption" $
+              let caption = text "Table 1"
+                  aligns = [(AlignRight, 0.0), (AlignLeft, 0.0), (AlignCenter, 0.0), (AlignDefault, 0.0)]
+                  headers = [plain $ text "Right",
+                             plain $ text "Left",
+                             plain $ text "Center",
+                             plain $ text "Default"]
+                  rows = [[plain $ text "1.1",
+                           plain $ text "1.2",
+                           plain $ text "1.3",
+                           plain $ text "1.4"]
+                         ,[plain $ text "2.1",
+                           plain $ text "2.2",
+                           plain $ text "2.3",
+                           plain $ text "2.4"]
+                         ,[plain $ text "3.1",
+                           plain $ text "3.2",
+                           plain $ text "3.3",
+                           plain $ text "3.4"]]
+              in table caption aligns headers rows
+              =?> unlines [ "\\startplacetable[caption={Table 1}]"
+                          , "\\startTABLE"
+                          , "\\startTABLEhead"
+                          , "\\NC[align=left] Right"
+                          , "\\NC[align=right] Left"
+                          , "\\NC[align=middle] Center"
+                          , "\\NC Default"
+                          , "\\NC\\NR"
+                          , "\\stopTABLEhead"
+                          , "\\startTABLEbody"
+                          , "\\NC[align=left] 1.1"
+                          , "\\NC[align=right] 1.2"
+                          , "\\NC[align=middle] 1.3"
+                          , "\\NC 1.4"
+                          , "\\NC\\NR"
+                          , "\\NC[align=left] 2.1"
+                          , "\\NC[align=right] 2.2"
+                          , "\\NC[align=middle] 2.3"
+                          , "\\NC 2.4"
+                          , "\\NC\\NR"
+                          , "\\stopTABLEbody"
+                          , "\\startTABLEfoot"
+                          , "\\NC[align=left] 3.1"
+                          , "\\NC[align=right] 3.2"
+                          , "\\NC[align=middle] 3.3"
+                          , "\\NC 3.4"
+                          , "\\NC\\NR"
+                          , "\\stopTABLEfoot"
+                          , "\\stopTABLE"
+                          , "\\stopplacetable" ]
+            ]
         ]
 
diff --git a/test/tables.context b/test/tables.context
index 371e559e5..89ff4a025 100644
--- a/test/tables.context
+++ b/test/tables.context
@@ -1,175 +1,230 @@
 Simple table with caption:
 
-\placetable{Demonstration of simple table syntax.}
-\starttable[|r|l|c|l|]
-\HL
-\NC Right
-\NC Left
-\NC Center
-\NC Default
-\NC\AR
-\HL
-\NC 12
-\NC 12
-\NC 12
-\NC 12
-\NC\AR
-\NC 123
-\NC 123
-\NC 123
-\NC 123
-\NC\AR
-\NC 1
-\NC 1
-\NC 1
-\NC 1
-\NC\AR
-\HL
-\stoptable
+\startplacetable[caption={Demonstration of simple table syntax.}]
+\startxtable
+\startxtablehead[head]
+\startxrow
+\startxcell[align=left] Right \stopxcell
+\startxcell[align=right] Left \stopxcell
+\startxcell[align=middle] Center \stopxcell
+\startxcell Default \stopxcell
+\stopxrow
+\stopxtablehead
+\startxtablebody[body]
+\startxrow
+\startxcell[align=left] 12 \stopxcell
+\startxcell[align=right] 12 \stopxcell
+\startxcell[align=middle] 12 \stopxcell
+\startxcell 12 \stopxcell
+\stopxrow
+\startxrow
+\startxcell[align=left] 123 \stopxcell
+\startxcell[align=right] 123 \stopxcell
+\startxcell[align=middle] 123 \stopxcell
+\startxcell 123 \stopxcell
+\stopxrow
+\stopxtablebody
+\startxtablefoot[foot]
+\startxrow
+\startxcell[align=left] 1 \stopxcell
+\startxcell[align=right] 1 \stopxcell
+\startxcell[align=middle] 1 \stopxcell
+\startxcell 1 \stopxcell
+\stopxrow
+\stopxtablefoot
+\stopxtable
+\stopplacetable
 
 Simple table without caption:
 
-\placetable[none]{}
-\starttable[|r|l|c|l|]
-\HL
-\NC Right
-\NC Left
-\NC Center
-\NC Default
-\NC\AR
-\HL
-\NC 12
-\NC 12
-\NC 12
-\NC 12
-\NC\AR
-\NC 123
-\NC 123
-\NC 123
-\NC 123
-\NC\AR
-\NC 1
-\NC 1
-\NC 1
-\NC 1
-\NC\AR
-\HL
-\stoptable
+\startplacetable[location=none]
+\startxtable
+\startxtablehead[head]
+\startxrow
+\startxcell[align=left] Right \stopxcell
+\startxcell[align=right] Left \stopxcell
+\startxcell[align=middle] Center \stopxcell
+\startxcell Default \stopxcell
+\stopxrow
+\stopxtablehead
+\startxtablebody[body]
+\startxrow
+\startxcell[align=left] 12 \stopxcell
+\startxcell[align=right] 12 \stopxcell
+\startxcell[align=middle] 12 \stopxcell
+\startxcell 12 \stopxcell
+\stopxrow
+\startxrow
+\startxcell[align=left] 123 \stopxcell
+\startxcell[align=right] 123 \stopxcell
+\startxcell[align=middle] 123 \stopxcell
+\startxcell 123 \stopxcell
+\stopxrow
+\stopxtablebody
+\startxtablefoot[foot]
+\startxrow
+\startxcell[align=left] 1 \stopxcell
+\startxcell[align=right] 1 \stopxcell
+\startxcell[align=middle] 1 \stopxcell
+\startxcell 1 \stopxcell
+\stopxrow
+\stopxtablefoot
+\stopxtable
+\stopplacetable
 
 Simple table indented two spaces:
 
-\placetable{Demonstration of simple table syntax.}
-\starttable[|r|l|c|l|]
-\HL
-\NC Right
-\NC Left
-\NC Center
-\NC Default
-\NC\AR
-\HL
-\NC 12
-\NC 12
-\NC 12
-\NC 12
-\NC\AR
-\NC 123
-\NC 123
-\NC 123
-\NC 123
-\NC\AR
-\NC 1
-\NC 1
-\NC 1
-\NC 1
-\NC\AR
-\HL
-\stoptable
+\startplacetable[caption={Demonstration of simple table syntax.}]
+\startxtable
+\startxtablehead[head]
+\startxrow
+\startxcell[align=left] Right \stopxcell
+\startxcell[align=right] Left \stopxcell
+\startxcell[align=middle] Center \stopxcell
+\startxcell Default \stopxcell
+\stopxrow
+\stopxtablehead
+\startxtablebody[body]
+\startxrow
+\startxcell[align=left] 12 \stopxcell
+\startxcell[align=right] 12 \stopxcell
+\startxcell[align=middle] 12 \stopxcell
+\startxcell 12 \stopxcell
+\stopxrow
+\startxrow
+\startxcell[align=left] 123 \stopxcell
+\startxcell[align=right] 123 \stopxcell
+\startxcell[align=middle] 123 \stopxcell
+\startxcell 123 \stopxcell
+\stopxrow
+\stopxtablebody
+\startxtablefoot[foot]
+\startxrow
+\startxcell[align=left] 1 \stopxcell
+\startxcell[align=right] 1 \stopxcell
+\startxcell[align=middle] 1 \stopxcell
+\startxcell 1 \stopxcell
+\stopxrow
+\stopxtablefoot
+\stopxtable
+\stopplacetable
 
 Multiline table with caption:
 
-\placetable{Here's the caption. It may span multiple lines.}
-\starttable[|cp(0.15\textwidth)|lp(0.14\textwidth)|rp(0.16\textwidth)|lp(0.34\textwidth)|]
-\HL
-\NC Centered Header
-\NC Left Aligned
-\NC Right Aligned
-\NC Default aligned
-\NC\AR
-\HL
-\NC First
-\NC row
-\NC 12.0
-\NC Example of a row that spans multiple lines.
-\NC\AR
-\NC Second
-\NC row
-\NC 5.0
-\NC Here's another one. Note the blank line between rows.
-\NC\AR
-\HL
-\stoptable
+\startplacetable[caption={Here's the caption. It may span multiple lines.}]
+\startxtable
+\startxtablehead[head]
+\startxrow
+\startxcell[align=middle,width={0.15\textwidth}] Centered Header \stopxcell
+\startxcell[align=right,width={0.14\textwidth}] Left Aligned \stopxcell
+\startxcell[align=left,width={0.16\textwidth}] Right Aligned \stopxcell
+\startxcell[align=right,width={0.34\textwidth}] Default aligned \stopxcell
+\stopxrow
+\stopxtablehead
+\startxtablebody[body]
+\startxrow
+\startxcell[align=middle,width={0.15\textwidth}] First \stopxcell
+\startxcell[align=right,width={0.14\textwidth}] row \stopxcell
+\startxcell[align=left,width={0.16\textwidth}] 12.0 \stopxcell
+\startxcell[align=right,width={0.34\textwidth}] Example of a row that spans
+multiple lines. \stopxcell
+\stopxrow
+\stopxtablebody
+\startxtablefoot[foot]
+\startxrow
+\startxcell[align=middle,width={0.15\textwidth}] Second \stopxcell
+\startxcell[align=right,width={0.14\textwidth}] row \stopxcell
+\startxcell[align=left,width={0.16\textwidth}] 5.0 \stopxcell
+\startxcell[align=right,width={0.34\textwidth}] Here's another one. Note the
+blank line between rows. \stopxcell
+\stopxrow
+\stopxtablefoot
+\stopxtable
+\stopplacetable
 
 Multiline table without caption:
 
-\placetable[none]{}
-\starttable[|cp(0.15\textwidth)|lp(0.14\textwidth)|rp(0.16\textwidth)|lp(0.34\textwidth)|]
-\HL
-\NC Centered Header
-\NC Left Aligned
-\NC Right Aligned
-\NC Default aligned
-\NC\AR
-\HL
-\NC First
-\NC row
-\NC 12.0
-\NC Example of a row that spans multiple lines.
-\NC\AR
-\NC Second
-\NC row
-\NC 5.0
-\NC Here's another one. Note the blank line between rows.
-\NC\AR
-\HL
-\stoptable
+\startplacetable[location=none]
+\startxtable
+\startxtablehead[head]
+\startxrow
+\startxcell[align=middle,width={0.15\textwidth}] Centered Header \stopxcell
+\startxcell[align=right,width={0.14\textwidth}] Left Aligned \stopxcell
+\startxcell[align=left,width={0.16\textwidth}] Right Aligned \stopxcell
+\startxcell[align=right,width={0.34\textwidth}] Default aligned \stopxcell
+\stopxrow
+\stopxtablehead
+\startxtablebody[body]
+\startxrow
+\startxcell[align=middle,width={0.15\textwidth}] First \stopxcell
+\startxcell[align=right,width={0.14\textwidth}] row \stopxcell
+\startxcell[align=left,width={0.16\textwidth}] 12.0 \stopxcell
+\startxcell[align=right,width={0.34\textwidth}] Example of a row that spans
+multiple lines. \stopxcell
+\stopxrow
+\stopxtablebody
+\startxtablefoot[foot]
+\startxrow
+\startxcell[align=middle,width={0.15\textwidth}] Second \stopxcell
+\startxcell[align=right,width={0.14\textwidth}] row \stopxcell
+\startxcell[align=left,width={0.16\textwidth}] 5.0 \stopxcell
+\startxcell[align=right,width={0.34\textwidth}] Here's another one. Note the
+blank line between rows. \stopxcell
+\stopxrow
+\stopxtablefoot
+\stopxtable
+\stopplacetable
 
 Table without column headers:
 
-\placetable[none]{}
-\starttable[|r|l|c|r|]
-\HL
-\NC 12
-\NC 12
-\NC 12
-\NC 12
-\NC\AR
-\NC 123
-\NC 123
-\NC 123
-\NC 123
-\NC\AR
-\NC 1
-\NC 1
-\NC 1
-\NC 1
-\NC\AR
-\HL
-\stoptable
+\startplacetable[location=none]
+\startxtable
+\startxtablebody[body]
+\startxrow
+\startxcell[align=left] 12 \stopxcell
+\startxcell[align=right] 12 \stopxcell
+\startxcell[align=middle] 12 \stopxcell
+\startxcell[align=left] 12 \stopxcell
+\stopxrow
+\startxrow
+\startxcell[align=left] 123 \stopxcell
+\startxcell[align=right] 123 \stopxcell
+\startxcell[align=middle] 123 \stopxcell
+\startxcell[align=left] 123 \stopxcell
+\stopxrow
+\stopxtablebody
+\startxtablefoot[foot]
+\startxrow
+\startxcell[align=left] 1 \stopxcell
+\startxcell[align=right] 1 \stopxcell
+\startxcell[align=middle] 1 \stopxcell
+\startxcell[align=left] 1 \stopxcell
+\stopxrow
+\stopxtablefoot
+\stopxtable
+\stopplacetable
 
 Multiline table without column headers:
 
-\placetable[none]{}
-\starttable[|cp(0.15\textwidth)|lp(0.14\textwidth)|rp(0.16\textwidth)|lp(0.34\textwidth)|]
-\HL
-\NC First
-\NC row
-\NC 12.0
-\NC Example of a row that spans multiple lines.
-\NC\AR
-\NC Second
-\NC row
-\NC 5.0
-\NC Here's another one. Note the blank line between rows.
-\NC\AR
-\HL
-\stoptable
+\startplacetable[location=none]
+\startxtable
+\startxtablebody[body]
+\startxrow
+\startxcell[align=middle,width={0.15\textwidth}] First \stopxcell
+\startxcell[align=right,width={0.14\textwidth}] row \stopxcell
+\startxcell[align=left,width={0.16\textwidth}] 12.0 \stopxcell
+\startxcell[width={0.34\textwidth}] Example of a row that spans multiple
+lines. \stopxcell
+\stopxrow
+\stopxtablebody
+\startxtablefoot[foot]
+\startxrow
+\startxcell[align=middle,width={0.15\textwidth}] Second \stopxcell
+\startxcell[align=right,width={0.14\textwidth}] row \stopxcell
+\startxcell[align=left,width={0.16\textwidth}] 5.0 \stopxcell
+\startxcell[width={0.34\textwidth}] Here's another one. Note the blank line
+between rows. \stopxcell
+\stopxrow
+\stopxtablefoot
+\stopxtable
+\stopplacetable
diff --git a/test/writer.context b/test/writer.context
index 9884c82c9..e7af684f8 100644
--- a/test/writer.context
+++ b/test/writer.context
@@ -51,6 +51,11 @@
 
 \setupthinrules[width=15em] % width of horizontal rules
 
+\setupxtable[frame=off]
+\setupxtable[head][topframe=on,bottomframe=on]
+\setupxtable[body][]
+\setupxtable[foot][bottomframe=on]
+
 
 \starttext
 \startalignment[middle]
diff --git a/test/writers-lang-and-dir.context b/test/writers-lang-and-dir.context
index 250ee8c59..19c45a4c9 100644
--- a/test/writers-lang-and-dir.context
+++ b/test/writers-lang-and-dir.context
@@ -49,6 +49,11 @@
 
 \setupthinrules[width=15em] % width of horizontal rules
 
+\setupxtable[frame=off]
+\setupxtable[head][topframe=on,bottomframe=on]
+\setupxtable[body][]
+\setupxtable[foot][bottomframe=on]
+
 
 \starttext