Moved XML-formatting functions to new unexported module Text.Pandoc.XML.

git-svn-id: https://pandoc.googlecode.com/svn/trunk@1253 788f1e2b-df1e-0410-8736-df70ead52e1b

3 files changed, 90 insertions, 116 deletions

diff --git a/Text/Pandoc/Writers/Docbook.hs b/Text/Pandoc/Writers/Docbook.hs
index 51a4497fa..d7ef5b8cc 100644
--- a/Text/Pandoc/Writers/Docbook.hs
+++ b/Text/Pandoc/Writers/Docbook.hs
@@ -29,71 +29,12 @@ Conversion of 'Pandoc' documents to Docbook XML.
 -}
 module Text.Pandoc.Writers.Docbook ( writeDocbook) where
 import Text.Pandoc.Definition
+import Text.Pandoc.XML
 import Text.Pandoc.Shared
 import Text.Pandoc.Readers.TeXMath
 import Data.List ( isPrefixOf, drop )
 import Text.PrettyPrint.HughesPJ hiding ( Str )
 
---
--- code to format XML
---
-
--- | Escape one character as needed for XML.
-escapeCharForXML :: Char -> String
-escapeCharForXML x = case x of
-                       '&'  -> "&"
-                       '<'  -> "&lt;"
-                       '>'  -> "&gt;"
-                       '"'  -> "&quot;"
-                       '\160' -> "&nbsp;"
-                       c    -> [c] 
-
--- | True if the character needs to be escaped.
-needsEscaping :: Char -> Bool
-needsEscaping c = c `elem` "&<>\"\160"
-
--- | Escape string as needed for XML.  Entity references are not preserved.
-escapeStringForXML :: String -> String
-escapeStringForXML ""  = ""
-escapeStringForXML str = 
-  case break needsEscaping str of
-    (okay, "")     -> okay
-    (okay, (c:cs)) -> okay ++ escapeCharForXML c ++ escapeStringForXML cs 
-
--- | Return a text object with a string of formatted XML attributes. 
-attributeList :: [(String, String)] -> Doc
-attributeList = text .  concatMap 
-  (\(a, b) -> " " ++ escapeStringForXML a ++ "=\"" ++ 
-  escapeStringForXML b ++ "\"") 
-
--- | Put the supplied contents between start and end tags of tagType,
---   with specified attributes and (if specified) indentation.
-inTags:: Bool -> String -> [(String, String)] -> Doc -> Doc
-inTags isIndented tagType attribs contents = 
-  let openTag = char '<' <> text tagType <> attributeList attribs <> 
-                char '>'
-      closeTag  = text "</" <> text tagType <> char '>'
-  in  if isIndented
-         then openTag $$ nest 2 contents $$ closeTag
-         else openTag <> contents <> closeTag
-
--- | Return a self-closing tag of tagType with specified attributes
-selfClosingTag :: String -> [(String, String)] -> Doc
-selfClosingTag tagType attribs = 
-  char '<' <> text tagType <> attributeList attribs <> text " />" 
- 
--- | Put the supplied contents between start and end tags of tagType.
-inTagsSimple :: String -> Doc -> Doc
-inTagsSimple tagType = inTags False tagType []
-
--- | Put the supplied contents in indented block btw start and end tags.
-inTagsIndented :: String -> Doc -> Doc
-inTagsIndented tagType = inTags True tagType []
-
---
--- Docbook writer
---
-
 -- | Convert list of authors to a docbook <author> section
 authorToDocbook :: [Char] -> Doc
 authorToDocbook name = inTagsIndented "author" $ 
diff --git a/Text/Pandoc/Writers/OpenDocument.hs b/Text/Pandoc/Writers/OpenDocument.hs
index 91aa4b966..b21871823 100644
--- a/Text/Pandoc/Writers/OpenDocument.hs
+++ b/Text/Pandoc/Writers/OpenDocument.hs
@@ -32,6 +32,7 @@ Conversion of 'Pandoc' documents to OpenDocument XML.
 module Text.Pandoc.Writers.OpenDocument ( writeOpenDocument ) where
 import Text.Pandoc.Definition
 import Text.Pandoc.Shared
+import Text.Pandoc.XML
 import Text.Pandoc.Readers.TeXMath
 import Text.PrettyPrint.HughesPJ hiding ( Str )
 
@@ -39,62 +40,6 @@ import Control.Applicative ((<$>))
 import Control.Monad.State
 import Data.Char (chr)
 
---
--- code to format XML
---
-
--- | Escape one character as needed for XML.
-escapeCharForXML :: Char -> String
-escapeCharForXML x = case x of
-                       '&'  -> "&amp;"
-                       '<'  -> "&lt;"
-                       '>'  -> "&gt;"
-                       '"'  -> "&quot;"
-                       '\160' -> "&nbsp;"
-                       c    -> [c]
-
--- | True if the character needs to be escaped.
-needsEscaping :: Char -> Bool
-needsEscaping c = c `elem` "&<>\"\160"
-
--- | Escape string as needed for XML.  Entity references are not preserved.
-escapeStringForXML :: String -> String
-escapeStringForXML ""  = ""
-escapeStringForXML str =
-  case break needsEscaping str of
-    (okay, "")     -> okay
-    (okay, (c:cs)) -> okay ++ escapeCharForXML c ++ escapeStringForXML cs
-
--- | Return a text object with a string of formatted XML attributes.
-attributeList :: [(String, String)] -> Doc
-attributeList = text .  concatMap
-  (\(a, b) -> " " ++ escapeStringForXML a ++ "=\"" ++
-  escapeStringForXML b ++ "\"")
-
--- | Put the supplied contents between start and end tags of tagType,
---   with specified attributes and (if specified) indentation.
-inTags:: Bool -> String -> [(String, String)] -> Doc -> Doc
-inTags isIndented tagType attribs contents =
-  let openTag = char '<' <> text tagType <> attributeList attribs <>
-                char '>'
-      closeTag  = text "</" <> text tagType <> char '>'
-  in  if isIndented
-         then openTag $$ nest 2 contents $$ closeTag
-         else openTag <> contents <> closeTag
-
--- | Return a self-closing tag of tagType with specified attributes
-selfClosingTag :: String -> [(String, String)] -> Doc
-selfClosingTag tagType attribs =
-  char '<' <> text tagType <> attributeList attribs <> text " />"
-
--- | Put the supplied contents between start and end tags of tagType.
-inTagsSimple :: String -> Doc -> Doc
-inTagsSimple tagType = inTags False tagType []
-
--- | Put the supplied contents in indented block btw start and end tags.
-inTagsIndented :: String -> Doc -> Doc
-inTagsIndented tagType = inTags True tagType []
-
 -- | Auxiliary function to convert Plain block to Para.
 plainToPara :: Block -> Block
 plainToPara (Plain x) = Para x
diff --git a/Text/Pandoc/XML.hs b/Text/Pandoc/XML.hs
new file mode 100644
index 000000000..a09a8c150
--- /dev/null
+++ b/Text/Pandoc/XML.hs
@@ -0,0 +1,88 @@
+{-
+Copyright (C) 2006-7 John MacFarlane <jgm@berkeley.edu>
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+-}
+
+{- |
+   Module      : Text.Pandoc.XML
+   Copyright   : Copyright (C) 2006-7 John MacFarlane
+   License     : GNU GPL, version 2 or above
+
+   Maintainer  : John MacFarlane <jgm@berkeley.edu>
+   Stability   : alpha
+   Portability : portable
+
+Functions for escaping and formatting XML.
+-}
+module Text.Pandoc.XML ( escapeCharForXML,
+                         escapeStringForXML,
+                         inTags,
+                         selfClosingTag,
+                         inTagsSimple,
+                         inTagsIndented  ) where
+import Text.PrettyPrint.HughesPJ
+
+-- | Escape one character as needed for XML.
+escapeCharForXML :: Char -> String
+escapeCharForXML x = case x of
+                       '&'  -> "&amp;"
+                       '<'  -> "&lt;"
+                       '>'  -> "&gt;"
+                       '"'  -> "&quot;"
+                       '\160' -> "&nbsp;"
+                       c    -> [c]
+
+-- | True if the character needs to be escaped.
+needsEscaping :: Char -> Bool
+needsEscaping c = c `elem` "&<>\"\160"
+
+-- | Escape string as needed for XML.  Entity references are not preserved.
+escapeStringForXML :: String -> String
+escapeStringForXML ""  = ""
+escapeStringForXML str =
+  case break needsEscaping str of
+    (okay, "")     -> okay
+    (okay, (c:cs)) -> okay ++ escapeCharForXML c ++ escapeStringForXML cs
+
+-- | Return a text object with a string of formatted XML attributes.
+attributeList :: [(String, String)] -> Doc
+attributeList = text .  concatMap
+  (\(a, b) -> " " ++ escapeStringForXML a ++ "=\"" ++
+  escapeStringForXML b ++ "\"")
+
+-- | Put the supplied contents between start and end tags of tagType,
+--   with specified attributes and (if specified) indentation.
+inTags:: Bool -> String -> [(String, String)] -> Doc -> Doc
+inTags isIndented tagType attribs contents =
+  let openTag = char '<' <> text tagType <> attributeList attribs <>
+                char '>'
+      closeTag  = text "</" <> text tagType <> char '>'
+  in  if isIndented
+         then openTag $$ nest 2 contents $$ closeTag
+         else openTag <> contents <> closeTag
+
+-- | Return a self-closing tag of tagType with specified attributes
+selfClosingTag :: String -> [(String, String)] -> Doc
+selfClosingTag tagType attribs =
+  char '<' <> text tagType <> attributeList attribs <> text " />"
+
+-- | Put the supplied contents between start and end tags of tagType.
+inTagsSimple :: String -> Doc -> Doc
+inTagsSimple tagType = inTags False tagType []
+
+-- | Put the supplied contents in indented block btw start and end tags.
+inTagsIndented :: String -> Doc -> Doc
+inTagsIndented tagType = inTags True tagType []