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<pre><a name="line-1"></a><span class='hs-comment'>{-
<a name="line-2"></a>Copyright (C) 2007 John MacFarlane <jgm@berkeley.edu>
<a name="line-3"></a>
<a name="line-4"></a>This program is free software; you can redistribute it and/or modify
<a name="line-5"></a>it under the terms of the GNU General Public License as published by
<a name="line-6"></a>the Free Software Foundation; either version 2 of the License, or
<a name="line-7"></a>(at your option) any later version.
<a name="line-8"></a>
<a name="line-9"></a>This program is distributed in the hope that it will be useful,
<a name="line-10"></a>but WITHOUT ANY WARRANTY; without even the implied warranty of
<a name="line-11"></a>MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
<a name="line-12"></a>GNU General Public License for more details.
<a name="line-13"></a>
<a name="line-14"></a>You should have received a copy of the GNU General Public License
<a name="line-15"></a>along with this program; if not, write to the Free Software
<a name="line-16"></a>Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
<a name="line-17"></a>-}</span>
<a name="line-18"></a>
<a name="line-19"></a><span class='hs-comment'>{- |
<a name="line-20"></a> Module : Text.Pandoc.Blocks
<a name="line-21"></a> Copyright : Copyright (C) 2007 John MacFarlane
<a name="line-22"></a> License : GNU GPL, version 2 or above
<a name="line-23"></a>
<a name="line-24"></a> Maintainer : John MacFarlane <jgm@berkeley.edu>
<a name="line-25"></a> Stability : alpha
<a name="line-26"></a> Portability : portable
<a name="line-27"></a>
<a name="line-28"></a>Functions for the manipulation of fixed-width blocks of text.
<a name="line-29"></a>These are used in the construction of plain-text tables.
<a name="line-30"></a>-}</span>
<a name="line-31"></a>
<a name="line-32"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Text</span><span class='hs-varop'>.</span><span class='hs-conid'>Pandoc</span><span class='hs-varop'>.</span><span class='hs-conid'>Blocks</span>
<a name="line-33"></a> <span class='hs-layout'>(</span>
<a name="line-34"></a> <span class='hs-conid'>TextBlock</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-35"></a> <span class='hs-varid'>docToBlock</span><span class='hs-layout'>,</span>
<a name="line-36"></a> <span class='hs-varid'>blockToDoc</span><span class='hs-layout'>,</span>
<a name="line-37"></a> <span class='hs-varid'>widthOfBlock</span><span class='hs-layout'>,</span>
<a name="line-38"></a> <span class='hs-varid'>heightOfBlock</span><span class='hs-layout'>,</span>
<a name="line-39"></a> <span class='hs-varid'>hcatBlocks</span><span class='hs-layout'>,</span>
<a name="line-40"></a> <span class='hs-varid'>hsepBlocks</span><span class='hs-layout'>,</span>
<a name="line-41"></a> <span class='hs-varid'>centerAlignBlock</span><span class='hs-layout'>,</span>
<a name="line-42"></a> <span class='hs-varid'>leftAlignBlock</span><span class='hs-layout'>,</span>
<a name="line-43"></a> <span class='hs-varid'>rightAlignBlock</span>
<a name="line-44"></a> <span class='hs-layout'>)</span>
<a name="line-45"></a><span class='hs-keyword'>where</span>
<a name="line-46"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Text</span><span class='hs-varop'>.</span><span class='hs-conid'>PrettyPrint</span>
<a name="line-47"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>List</span> <span class='hs-layout'>(</span> <span class='hs-varid'>intersperse</span> <span class='hs-layout'>)</span>
<a name="line-48"></a>
<a name="line-49"></a><a name="TextBlock"></a><span class='hs-comment'>-- | A fixed-width block of text. Parameters are width of block,</span>
<a name="line-50"></a><a name="TextBlock"></a><span class='hs-comment'>-- height of block, and list of lines.</span>
<a name="line-51"></a><a name="TextBlock"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>TextBlock</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>TextBlock</span> <span class='hs-conid'>Int</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>String</span><span class='hs-keyglyph'>]</span>
<a name="line-52"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Show</span> <span class='hs-conid'>TextBlock</span> <span class='hs-keyword'>where</span>
<a name="line-53"></a> <span class='hs-varid'>show</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>show</span> <span class='hs-varop'>$</span> <span class='hs-varid'>blockToDoc</span> <span class='hs-varid'>x</span>
<a name="line-54"></a>
<a name="line-55"></a><a name="breakLines"></a><span class='hs-comment'>-- | Break lines in a list of lines so that none are greater than</span>
<a name="line-56"></a><span class='hs-comment'>-- a given width.</span>
<a name="line-57"></a><span class='hs-definition'>breakLines</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-comment'>-- ^ Maximum length of lines.</span>
<a name="line-58"></a> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>String</span><span class='hs-keyglyph'>]</span> <span class='hs-comment'>-- ^ List of lines.</span>
<a name="line-59"></a> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>String</span><span class='hs-keyglyph'>]</span>
<a name="line-60"></a><span class='hs-definition'>breakLines</span> <span class='hs-keyword'>_</span> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>[]</span>
<a name="line-61"></a><span class='hs-definition'>breakLines</span> <span class='hs-varid'>width</span> <span class='hs-layout'>(</span><span class='hs-varid'>l</span><span class='hs-conop'>:</span><span class='hs-varid'>ls</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-62"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>length</span> <span class='hs-varid'>l</span> <span class='hs-varop'>></span> <span class='hs-varid'>width</span>
<a name="line-63"></a> <span class='hs-keyword'>then</span> <span class='hs-layout'>(</span><span class='hs-varid'>take</span> <span class='hs-varid'>width</span> <span class='hs-varid'>l</span><span class='hs-layout'>)</span><span class='hs-conop'>:</span><span class='hs-layout'>(</span><span class='hs-varid'>breakLines</span> <span class='hs-varid'>width</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varid'>drop</span> <span class='hs-varid'>width</span> <span class='hs-varid'>l</span><span class='hs-layout'>)</span><span class='hs-conop'>:</span><span class='hs-varid'>ls</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-64"></a> <span class='hs-keyword'>else</span> <span class='hs-varid'>l</span><span class='hs-conop'>:</span><span class='hs-layout'>(</span><span class='hs-varid'>breakLines</span> <span class='hs-varid'>width</span> <span class='hs-varid'>ls</span><span class='hs-layout'>)</span>
<a name="line-65"></a>
<a name="line-66"></a><a name="docToBlock"></a><span class='hs-comment'>-- | Convert a @Doc@ element into a @TextBlock@ with a specified width. </span>
<a name="line-67"></a><span class='hs-definition'>docToBlock</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-comment'>-- ^ Width of text block.</span>
<a name="line-68"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Doc</span> <span class='hs-comment'>-- ^ @Doc@ to convert.</span>
<a name="line-69"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>TextBlock</span>
<a name="line-70"></a><span class='hs-definition'>docToBlock</span> <span class='hs-varid'>width</span> <span class='hs-varid'>doc</span> <span class='hs-keyglyph'>=</span>
<a name="line-71"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>rendered</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>renderStyle</span> <span class='hs-layout'>(</span><span class='hs-varid'>style</span> <span class='hs-layout'>{</span><span class='hs-varid'>lineLength</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>width</span><span class='hs-layout'>,</span>
<a name="line-72"></a> <span class='hs-varid'>ribbonsPerLine</span> <span class='hs-keyglyph'>=</span> <span class='hs-num'>1</span><span class='hs-layout'>}</span><span class='hs-layout'>)</span> <span class='hs-varid'>doc</span>
<a name="line-73"></a> <span class='hs-varid'>lns</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>breakLines</span> <span class='hs-varid'>width</span> <span class='hs-varop'>$</span> <span class='hs-varid'>lines</span> <span class='hs-varid'>rendered</span>
<a name="line-74"></a> <span class='hs-keyword'>in</span> <span class='hs-conid'>TextBlock</span> <span class='hs-varid'>width</span> <span class='hs-layout'>(</span><span class='hs-varid'>length</span> <span class='hs-varid'>lns</span><span class='hs-layout'>)</span> <span class='hs-varid'>lns</span>
<a name="line-75"></a>
<a name="line-76"></a><a name="blockToDoc"></a><span class='hs-comment'>-- | Convert a @TextBlock@ to a @Doc@ element.</span>
<a name="line-77"></a><span class='hs-definition'>blockToDoc</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>TextBlock</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Doc</span>
<a name="line-78"></a><span class='hs-definition'>blockToDoc</span> <span class='hs-layout'>(</span><span class='hs-conid'>TextBlock</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>lns</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-79"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>null</span> <span class='hs-varid'>lns</span>
<a name="line-80"></a> <span class='hs-keyword'>then</span> <span class='hs-varid'>empty</span>
<a name="line-81"></a> <span class='hs-keyword'>else</span> <span class='hs-varid'>vcat</span> <span class='hs-varop'>$</span> <span class='hs-varid'>map</span> <span class='hs-varid'>text</span> <span class='hs-varid'>lns</span>
<a name="line-82"></a>
<a name="line-83"></a><a name="widthOfBlock"></a><span class='hs-comment'>-- | Returns width of a @TextBlock@ (number of columns).</span>
<a name="line-84"></a><span class='hs-definition'>widthOfBlock</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>TextBlock</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span>
<a name="line-85"></a><span class='hs-definition'>widthOfBlock</span> <span class='hs-layout'>(</span><span class='hs-conid'>TextBlock</span> <span class='hs-varid'>width</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>width</span>
<a name="line-86"></a>
<a name="line-87"></a><a name="heightOfBlock"></a><span class='hs-comment'>-- | Returns height of a @TextBlock@ (number of rows).</span>
<a name="line-88"></a><span class='hs-definition'>heightOfBlock</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>TextBlock</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span>
<a name="line-89"></a><span class='hs-definition'>heightOfBlock</span> <span class='hs-layout'>(</span><span class='hs-conid'>TextBlock</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>height</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>height</span>
<a name="line-90"></a>
<a name="line-91"></a><a name="hPad"></a><span class='hs-comment'>-- | Pads a string out to a given width using spaces.</span>
<a name="line-92"></a><span class='hs-definition'>hPad</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-comment'>-- ^ Desired width.</span>
<a name="line-93"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span> <span class='hs-comment'>-- ^ String to pad.</span>
<a name="line-94"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span>
<a name="line-95"></a><span class='hs-definition'>hPad</span> <span class='hs-varid'>width</span> <span class='hs-varid'>line</span> <span class='hs-keyglyph'>=</span>
<a name="line-96"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>linelen</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>length</span> <span class='hs-varid'>line</span>
<a name="line-97"></a> <span class='hs-keyword'>in</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>linelen</span> <span class='hs-varop'><=</span> <span class='hs-varid'>width</span>
<a name="line-98"></a> <span class='hs-keyword'>then</span> <span class='hs-varid'>line</span> <span class='hs-varop'>++</span> <span class='hs-varid'>replicate</span> <span class='hs-layout'>(</span><span class='hs-varid'>width</span> <span class='hs-comment'>-</span> <span class='hs-varid'>linelen</span><span class='hs-layout'>)</span> <span class='hs-chr'>' '</span>
<a name="line-99"></a> <span class='hs-keyword'>else</span> <span class='hs-varid'>take</span> <span class='hs-varid'>width</span> <span class='hs-varid'>line</span>
<a name="line-100"></a>
<a name="line-101"></a><a name="hcatBlocks"></a><span class='hs-comment'>-- | Concatenates a list of @TextBlock@s into a new @TextBlock@ in</span>
<a name="line-102"></a><span class='hs-comment'>-- which they appear side by side.</span>
<a name="line-103"></a><span class='hs-definition'>hcatBlocks</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>TextBlock</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>TextBlock</span>
<a name="line-104"></a><span class='hs-definition'>hcatBlocks</span> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>TextBlock</span> <span class='hs-num'>0</span> <span class='hs-num'>0</span> <span class='hs-conid'>[]</span>
<a name="line-105"></a><span class='hs-definition'>hcatBlocks</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>x</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>x</span> <span class='hs-comment'>-- This is not redundant! We don't want last item hPad'd.</span>
<a name="line-106"></a><span class='hs-definition'>hcatBlocks</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-conid'>TextBlock</span> <span class='hs-varid'>width1</span> <span class='hs-varid'>height1</span> <span class='hs-varid'>lns1</span><span class='hs-layout'>)</span><span class='hs-conop'>:</span><span class='hs-varid'>xs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-107"></a> <span class='hs-keyword'>let</span> <span class='hs-layout'>(</span><span class='hs-conid'>TextBlock</span> <span class='hs-varid'>width2</span> <span class='hs-varid'>height2</span> <span class='hs-varid'>lns2</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>hcatBlocks</span> <span class='hs-varid'>xs</span>
<a name="line-108"></a> <span class='hs-varid'>height</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>max</span> <span class='hs-varid'>height1</span> <span class='hs-varid'>height2</span>
<a name="line-109"></a> <span class='hs-varid'>width</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>width1</span> <span class='hs-varop'>+</span> <span class='hs-varid'>width2</span>
<a name="line-110"></a> <span class='hs-varid'>lns1'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>map</span> <span class='hs-layout'>(</span><span class='hs-varid'>hPad</span> <span class='hs-varid'>width1</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-varid'>lns1</span> <span class='hs-varop'>++</span> <span class='hs-varid'>replicate</span> <span class='hs-layout'>(</span><span class='hs-varid'>height</span> <span class='hs-comment'>-</span> <span class='hs-varid'>height1</span><span class='hs-layout'>)</span> <span class='hs-str'>""</span>
<a name="line-111"></a> <span class='hs-varid'>lns2'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>lns2</span> <span class='hs-varop'>++</span> <span class='hs-varid'>replicate</span> <span class='hs-layout'>(</span><span class='hs-varid'>height</span> <span class='hs-comment'>-</span> <span class='hs-varid'>height2</span><span class='hs-layout'>)</span> <span class='hs-str'>""</span>
<a name="line-112"></a> <span class='hs-varid'>lns</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>zipWith</span> <span class='hs-layout'>(</span><span class='hs-varop'>++</span><span class='hs-layout'>)</span> <span class='hs-varid'>lns1'</span> <span class='hs-varid'>lns2'</span>
<a name="line-113"></a> <span class='hs-keyword'>in</span> <span class='hs-conid'>TextBlock</span> <span class='hs-varid'>width</span> <span class='hs-varid'>height</span> <span class='hs-varid'>lns</span>
<a name="line-114"></a>
<a name="line-115"></a><a name="hsepBlocks"></a><span class='hs-comment'>-- | Like @hcatBlocks@, but inserts space between the @TextBlock@s.</span>
<a name="line-116"></a><span class='hs-definition'>hsepBlocks</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>TextBlock</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>TextBlock</span>
<a name="line-117"></a><span class='hs-definition'>hsepBlocks</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>hcatBlocks</span> <span class='hs-varop'>.</span> <span class='hs-layout'>(</span><span class='hs-varid'>intersperse</span> <span class='hs-layout'>(</span><span class='hs-conid'>TextBlock</span> <span class='hs-num'>1</span> <span class='hs-num'>1</span> <span class='hs-keyglyph'>[</span><span class='hs-str'>" "</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-118"></a>
<a name="line-119"></a><a name="isWhitespace"></a><span class='hs-definition'>isWhitespace</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span>
<a name="line-120"></a><span class='hs-definition'>isWhitespace</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>x</span> <span class='hs-varop'>`elem`</span> <span class='hs-str'>" \t"</span>
<a name="line-121"></a>
<a name="line-122"></a><a name="leftAlignBlock"></a><span class='hs-comment'>-- | Left-aligns the contents of a @TextBlock@ within the block.</span>
<a name="line-123"></a><span class='hs-definition'>leftAlignBlock</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>TextBlock</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>TextBlock</span>
<a name="line-124"></a><span class='hs-definition'>leftAlignBlock</span> <span class='hs-layout'>(</span><span class='hs-conid'>TextBlock</span> <span class='hs-varid'>width</span> <span class='hs-varid'>height</span> <span class='hs-varid'>lns</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-125"></a> <span class='hs-conid'>TextBlock</span> <span class='hs-varid'>width</span> <span class='hs-varid'>height</span> <span class='hs-varop'>$</span> <span class='hs-varid'>map</span> <span class='hs-layout'>(</span><span class='hs-varid'>dropWhile</span> <span class='hs-varid'>isWhitespace</span><span class='hs-layout'>)</span> <span class='hs-varid'>lns</span>
<a name="line-126"></a>
<a name="line-127"></a><a name="rightAlignBlock"></a><span class='hs-comment'>-- | Right-aligns the contents of a @TextBlock@ within the block.</span>
<a name="line-128"></a><span class='hs-definition'>rightAlignBlock</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>TextBlock</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>TextBlock</span>
<a name="line-129"></a><span class='hs-definition'>rightAlignBlock</span> <span class='hs-layout'>(</span><span class='hs-conid'>TextBlock</span> <span class='hs-varid'>width</span> <span class='hs-varid'>height</span> <span class='hs-varid'>lns</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-130"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>rightAlignLine</span> <span class='hs-varid'>ln</span> <span class='hs-keyglyph'>=</span>
<a name="line-131"></a> <span class='hs-keyword'>let</span> <span class='hs-layout'>(</span><span class='hs-varid'>spaces</span><span class='hs-layout'>,</span> <span class='hs-varid'>rest</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>span</span> <span class='hs-varid'>isWhitespace</span> <span class='hs-varop'>$</span> <span class='hs-varid'>reverse</span> <span class='hs-varop'>$</span> <span class='hs-varid'>hPad</span> <span class='hs-varid'>width</span> <span class='hs-varid'>ln</span>
<a name="line-132"></a> <span class='hs-keyword'>in</span> <span class='hs-varid'>reverse</span> <span class='hs-layout'>(</span><span class='hs-varid'>rest</span> <span class='hs-varop'>++</span> <span class='hs-varid'>spaces</span><span class='hs-layout'>)</span>
<a name="line-133"></a> <span class='hs-keyword'>in</span> <span class='hs-conid'>TextBlock</span> <span class='hs-varid'>width</span> <span class='hs-varid'>height</span> <span class='hs-varop'>$</span> <span class='hs-varid'>map</span> <span class='hs-varid'>rightAlignLine</span> <span class='hs-varid'>lns</span>
<a name="line-134"></a>
<a name="line-135"></a><a name="centerAlignBlock"></a><span class='hs-comment'>-- | Centers the contents of a @TextBlock@ within the block.</span>
<a name="line-136"></a><span class='hs-definition'>centerAlignBlock</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>TextBlock</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>TextBlock</span>
<a name="line-137"></a><span class='hs-definition'>centerAlignBlock</span> <span class='hs-layout'>(</span><span class='hs-conid'>TextBlock</span> <span class='hs-varid'>width</span> <span class='hs-varid'>height</span> <span class='hs-varid'>lns</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-138"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>centerAlignLine</span> <span class='hs-varid'>ln</span> <span class='hs-keyglyph'>=</span>
<a name="line-139"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>ln'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>hPad</span> <span class='hs-varid'>width</span> <span class='hs-varid'>ln</span>
<a name="line-140"></a> <span class='hs-layout'>(</span><span class='hs-varid'>startSpaces</span><span class='hs-layout'>,</span> <span class='hs-varid'>rest</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>span</span> <span class='hs-varid'>isWhitespace</span> <span class='hs-varid'>ln'</span>
<a name="line-141"></a> <span class='hs-varid'>endSpaces</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>takeWhile</span> <span class='hs-varid'>isWhitespace</span> <span class='hs-layout'>(</span><span class='hs-varid'>reverse</span> <span class='hs-varid'>ln'</span><span class='hs-layout'>)</span>
<a name="line-142"></a> <span class='hs-varid'>numSpaces</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>length</span> <span class='hs-layout'>(</span><span class='hs-varid'>startSpaces</span> <span class='hs-varop'>++</span> <span class='hs-varid'>endSpaces</span><span class='hs-layout'>)</span>
<a name="line-143"></a> <span class='hs-varid'>startSpaces'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>replicate</span> <span class='hs-layout'>(</span><span class='hs-varid'>quot</span> <span class='hs-varid'>numSpaces</span> <span class='hs-num'>2</span><span class='hs-layout'>)</span> <span class='hs-chr'>' '</span>
<a name="line-144"></a> <span class='hs-keyword'>in</span> <span class='hs-varid'>startSpaces'</span> <span class='hs-varop'>++</span> <span class='hs-varid'>rest</span>
<a name="line-145"></a> <span class='hs-keyword'>in</span> <span class='hs-conid'>TextBlock</span> <span class='hs-varid'>width</span> <span class='hs-varid'>height</span> <span class='hs-varop'>$</span> <span class='hs-varid'>map</span> <span class='hs-varid'>centerAlignLine</span> <span class='hs-varid'>lns</span>
<a name="line-146"></a>
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