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<title>Language/Preprocessor/Cpphs/Position.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-2"></a><span class='hs-comment'>-- |</span>
<a name="line-3"></a><span class='hs-comment'>-- Module : Position</span>
<a name="line-4"></a><span class='hs-comment'>-- Copyright : 2000-2004 Malcolm Wallace</span>
<a name="line-5"></a><span class='hs-comment'>-- Licence : LGPL</span>
<a name="line-6"></a><span class='hs-comment'>--</span>
<a name="line-7"></a><span class='hs-comment'>-- Maintainer : Malcolm Wallace <Malcolm.Wallace@cs.york.ac.uk></span>
<a name="line-8"></a><span class='hs-comment'>-- Stability : experimental</span>
<a name="line-9"></a><span class='hs-comment'>-- Portability : All</span>
<a name="line-10"></a><span class='hs-comment'>--</span>
<a name="line-11"></a><span class='hs-comment'>-- Simple file position information, with recursive inclusion points.</span>
<a name="line-12"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-13"></a>
<a name="line-14"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Language</span><span class='hs-varop'>.</span><span class='hs-conid'>Preprocessor</span><span class='hs-varop'>.</span><span class='hs-conid'>Cpphs</span><span class='hs-varop'>.</span><span class='hs-conid'>Position</span>
<a name="line-15"></a> <span class='hs-layout'>(</span> <span class='hs-conid'>Posn</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-16"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>newfile</span>
<a name="line-17"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>addcol</span><span class='hs-layout'>,</span> <span class='hs-varid'>newline</span><span class='hs-layout'>,</span> <span class='hs-varid'>tab</span><span class='hs-layout'>,</span> <span class='hs-varid'>newlines</span><span class='hs-layout'>,</span> <span class='hs-varid'>newpos</span>
<a name="line-18"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>cppline</span><span class='hs-layout'>,</span> <span class='hs-varid'>haskline</span><span class='hs-layout'>,</span> <span class='hs-varid'>cpp2hask</span>
<a name="line-19"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>filename</span><span class='hs-layout'>,</span> <span class='hs-varid'>lineno</span><span class='hs-layout'>,</span> <span class='hs-varid'>directory</span>
<a name="line-20"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-21"></a>
<a name="line-22"></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'>isPrefixOf</span><span class='hs-layout'>)</span>
<a name="line-23"></a>
<a name="line-24"></a><a name="Posn"></a><span class='hs-comment'>-- | Source positions contain a filename, line, column, and an</span>
<a name="line-25"></a><a name="Posn"></a><span class='hs-comment'>-- inclusion point, which is itself another source position,</span>
<a name="line-26"></a><a name="Posn"></a><span class='hs-comment'>-- recursively.</span>
<a name="line-27"></a><a name="Posn"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>Posn</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Pn</span> <span class='hs-conid'>String</span> <span class='hs-varop'>!</span><span class='hs-conid'>Int</span> <span class='hs-varop'>!</span><span class='hs-conid'>Int</span> <span class='hs-layout'>(</span><span class='hs-conid'>Maybe</span> <span class='hs-conid'>Posn</span><span class='hs-layout'>)</span>
<a name="line-28"></a> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span><span class='hs-conid'>Eq</span><span class='hs-layout'>)</span>
<a name="line-29"></a>
<a name="line-30"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Show</span> <span class='hs-conid'>Posn</span> <span class='hs-keyword'>where</span>
<a name="line-31"></a> <span class='hs-varid'>showsPrec</span> <span class='hs-keyword'>_</span> <span class='hs-layout'>(</span><span class='hs-conid'>Pn</span> <span class='hs-varid'>f</span> <span class='hs-varid'>l</span> <span class='hs-varid'>c</span> <span class='hs-varid'>i</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>showString</span> <span class='hs-varid'>f</span> <span class='hs-varop'>.</span>
<a name="line-32"></a> <span class='hs-varid'>showString</span> <span class='hs-str'>" at line "</span> <span class='hs-varop'>.</span> <span class='hs-varid'>shows</span> <span class='hs-varid'>l</span> <span class='hs-varop'>.</span>
<a name="line-33"></a> <span class='hs-varid'>showString</span> <span class='hs-str'>" col "</span> <span class='hs-varop'>.</span> <span class='hs-varid'>shows</span> <span class='hs-varid'>c</span> <span class='hs-varop'>.</span>
<a name="line-34"></a> <span class='hs-layout'>(</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>i</span> <span class='hs-keyword'>of</span>
<a name="line-35"></a> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>id</span>
<a name="line-36"></a> <span class='hs-conid'>Just</span> <span class='hs-varid'>p</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>showString</span> <span class='hs-str'>"\n used by "</span> <span class='hs-varop'>.</span>
<a name="line-37"></a> <span class='hs-varid'>shows</span> <span class='hs-varid'>p</span> <span class='hs-layout'>)</span>
<a name="line-38"></a>
<a name="line-39"></a><a name="newfile"></a><span class='hs-comment'>-- | Constructor. Argument is filename.</span>
<a name="line-40"></a><span class='hs-definition'>newfile</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Posn</span>
<a name="line-41"></a><span class='hs-definition'>newfile</span> <span class='hs-varid'>name</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Pn</span> <span class='hs-varid'>name</span> <span class='hs-num'>1</span> <span class='hs-num'>1</span> <span class='hs-conid'>Nothing</span>
<a name="line-42"></a>
<a name="line-43"></a><a name="addcol"></a><span class='hs-comment'>-- | Increment column number by given quantity.</span>
<a name="line-44"></a><span class='hs-definition'>addcol</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Posn</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Posn</span>
<a name="line-45"></a><span class='hs-definition'>addcol</span> <span class='hs-varid'>n</span> <span class='hs-layout'>(</span><span class='hs-conid'>Pn</span> <span class='hs-varid'>f</span> <span class='hs-varid'>r</span> <span class='hs-varid'>c</span> <span class='hs-varid'>i</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Pn</span> <span class='hs-varid'>f</span> <span class='hs-varid'>r</span> <span class='hs-layout'>(</span><span class='hs-varid'>c</span><span class='hs-varop'>+</span><span class='hs-varid'>n</span><span class='hs-layout'>)</span> <span class='hs-varid'>i</span>
<a name="line-46"></a>
<a name="line-47"></a><a name="newline"></a><span class='hs-comment'>-- | Increment row number, reset column to 1.</span>
<a name="line-48"></a><span class='hs-definition'>newline</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Posn</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Posn</span>
<a name="line-49"></a><span class='hs-comment'>--newline (Pn f r _ i) = Pn f (r+1) 1 i</span>
<a name="line-50"></a><span class='hs-definition'>newline</span> <span class='hs-layout'>(</span><span class='hs-conid'>Pn</span> <span class='hs-varid'>f</span> <span class='hs-varid'>r</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>i</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>let</span> <span class='hs-varid'>r'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>r</span><span class='hs-varop'>+</span><span class='hs-num'>1</span> <span class='hs-keyword'>in</span> <span class='hs-varid'>r'</span> <span class='hs-varop'>`seq`</span> <span class='hs-conid'>Pn</span> <span class='hs-varid'>f</span> <span class='hs-varid'>r'</span> <span class='hs-num'>1</span> <span class='hs-varid'>i</span>
<a name="line-51"></a>
<a name="line-52"></a><a name="tab"></a><span class='hs-comment'>-- | Increment column number, tab stops are every 8 chars.</span>
<a name="line-53"></a><span class='hs-definition'>tab</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Posn</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Posn</span>
<a name="line-54"></a><span class='hs-definition'>tab</span> <span class='hs-layout'>(</span><span class='hs-conid'>Pn</span> <span class='hs-varid'>f</span> <span class='hs-varid'>r</span> <span class='hs-varid'>c</span> <span class='hs-varid'>i</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Pn</span> <span class='hs-varid'>f</span> <span class='hs-varid'>r</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varid'>c</span><span class='hs-varop'>`div`</span><span class='hs-num'>8</span><span class='hs-layout'>)</span><span class='hs-varop'>+</span><span class='hs-num'>1</span><span class='hs-layout'>)</span><span class='hs-varop'>*</span><span class='hs-num'>8</span><span class='hs-layout'>)</span> <span class='hs-varid'>i</span>
<a name="line-55"></a>
<a name="line-56"></a><a name="newlines"></a><span class='hs-comment'>-- | Increment row number by given quantity.</span>
<a name="line-57"></a><span class='hs-definition'>newlines</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Posn</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Posn</span>
<a name="line-58"></a><span class='hs-definition'>newlines</span> <span class='hs-varid'>n</span> <span class='hs-layout'>(</span><span class='hs-conid'>Pn</span> <span class='hs-varid'>f</span> <span class='hs-varid'>r</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>i</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Pn</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-varid'>r</span><span class='hs-varop'>+</span><span class='hs-varid'>n</span><span class='hs-layout'>)</span> <span class='hs-num'>1</span> <span class='hs-varid'>i</span>
<a name="line-59"></a>
<a name="line-60"></a><a name="newpos"></a><span class='hs-comment'>-- | Update position with a new row, and possible filename.</span>
<a name="line-61"></a><span class='hs-definition'>newpos</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Posn</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Posn</span>
<a name="line-62"></a><span class='hs-definition'>newpos</span> <span class='hs-varid'>r</span> <span class='hs-conid'>Nothing</span> <span class='hs-layout'>(</span><span class='hs-conid'>Pn</span> <span class='hs-varid'>f</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>c</span> <span class='hs-varid'>i</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Pn</span> <span class='hs-varid'>f</span> <span class='hs-varid'>r</span> <span class='hs-varid'>c</span> <span class='hs-varid'>i</span>
<a name="line-63"></a><span class='hs-definition'>newpos</span> <span class='hs-varid'>r</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-chr'>'"'</span><span class='hs-conop'>:</span><span class='hs-varid'>f</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Pn</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>c</span> <span class='hs-varid'>i</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Pn</span> <span class='hs-layout'>(</span><span class='hs-varid'>init</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span> <span class='hs-varid'>r</span> <span class='hs-varid'>c</span> <span class='hs-varid'>i</span>
<a name="line-64"></a><span class='hs-definition'>newpos</span> <span class='hs-varid'>r</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Pn</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>c</span> <span class='hs-varid'>i</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Pn</span> <span class='hs-varid'>f</span> <span class='hs-varid'>r</span> <span class='hs-varid'>c</span> <span class='hs-varid'>i</span>
<a name="line-65"></a>
<a name="line-66"></a><a name="lineno"></a><span class='hs-comment'>-- | Project the line number.</span>
<a name="line-67"></a><span class='hs-definition'>lineno</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Posn</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span>
<a name="line-68"></a><a name="filename"></a><span class='hs-comment'>-- | Project the filename.</span>
<a name="line-69"></a><span class='hs-definition'>filename</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Posn</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span>
<a name="line-70"></a><a name="directory"></a><span class='hs-comment'>-- | Project the directory of the filename.</span>
<a name="line-71"></a><span class='hs-definition'>directory</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Posn</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>FilePath</span>
<a name="line-72"></a>
<a name="line-73"></a><span class='hs-definition'>lineno</span> <span class='hs-layout'>(</span><span class='hs-conid'>Pn</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>r</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'>r</span>
<a name="line-74"></a><span class='hs-definition'>filename</span> <span class='hs-layout'>(</span><span class='hs-conid'>Pn</span> <span class='hs-varid'>f</span> <span class='hs-keyword'>_</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'>f</span>
<a name="line-75"></a><span class='hs-definition'>directory</span> <span class='hs-layout'>(</span><span class='hs-conid'>Pn</span> <span class='hs-varid'>f</span> <span class='hs-keyword'>_</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'>dirname</span> <span class='hs-varid'>f</span>
<a name="line-76"></a>
<a name="line-77"></a>
<a name="line-78"></a><a name="cppline"></a><span class='hs-comment'>-- | cpp-style printing of file position</span>
<a name="line-79"></a><span class='hs-definition'>cppline</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Posn</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span>
<a name="line-80"></a><span class='hs-definition'>cppline</span> <span class='hs-layout'>(</span><span class='hs-conid'>Pn</span> <span class='hs-varid'>f</span> <span class='hs-varid'>r</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"#line "</span><span class='hs-varop'>++</span><span class='hs-varid'>show</span> <span class='hs-varid'>r</span><span class='hs-varop'>++</span><span class='hs-str'>" "</span><span class='hs-varop'>++</span><span class='hs-varid'>show</span> <span class='hs-varid'>f</span>
<a name="line-81"></a>
<a name="line-82"></a><a name="haskline"></a><span class='hs-comment'>-- | haskell-style printing of file position</span>
<a name="line-83"></a><span class='hs-definition'>haskline</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Posn</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span>
<a name="line-84"></a><span class='hs-definition'>haskline</span> <span class='hs-layout'>(</span><span class='hs-conid'>Pn</span> <span class='hs-varid'>f</span> <span class='hs-varid'>r</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"{-# LINE "</span><span class='hs-varop'>++</span><span class='hs-varid'>show</span> <span class='hs-varid'>r</span><span class='hs-varop'>++</span><span class='hs-str'>" "</span><span class='hs-varop'>++</span><span class='hs-varid'>show</span> <span class='hs-varid'>f</span><span class='hs-varop'>++</span><span class='hs-str'>" #-}"</span>
<a name="line-85"></a>
<a name="line-86"></a><a name="cpp2hask"></a><span class='hs-comment'>-- | Conversion from a cpp-style "#line" to haskell-style pragma.</span>
<a name="line-87"></a><span class='hs-definition'>cpp2hask</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span>
<a name="line-88"></a><span class='hs-definition'>cpp2hask</span> <span class='hs-varid'>line</span> <span class='hs-keyglyph'>|</span> <span class='hs-str'>"#line"</span> <span class='hs-varop'>`isPrefixOf`</span> <span class='hs-varid'>line</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"{-# LINE "</span>
<a name="line-89"></a> <span class='hs-varop'>++</span><span class='hs-varid'>unwords</span> <span class='hs-layout'>(</span><span class='hs-varid'>tail</span> <span class='hs-layout'>(</span><span class='hs-varid'>words</span> <span class='hs-varid'>line</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-90"></a> <span class='hs-varop'>++</span><span class='hs-str'>" #-}"</span>
<a name="line-91"></a>
<a name="line-92"></a><a name="dirname"></a><span class='hs-comment'>-- | Strip non-directory suffix from file name (analogous to the shell</span>
<a name="line-93"></a><span class='hs-comment'>-- command of the same name).</span>
<a name="line-94"></a><span class='hs-definition'>dirname</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span>
<a name="line-95"></a><span class='hs-definition'>dirname</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>reverse</span> <span class='hs-varop'>.</span> <span class='hs-varid'>safetail</span> <span class='hs-varop'>.</span> <span class='hs-varid'>dropWhile</span> <span class='hs-layout'>(</span><span class='hs-varid'>not</span><span class='hs-varop'>.</span><span class='hs-layout'>(</span><span class='hs-varop'>`elem`</span><span class='hs-str'>"\\/"</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varop'>.</span> <span class='hs-varid'>reverse</span>
<a name="line-96"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>safetail</span> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>[]</span>
<a name="line-97"></a> <span class='hs-varid'>safetail</span> <span class='hs-layout'>(</span><span class='hs-keyword'>_</span><span class='hs-conop'>:</span><span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>x</span>
<a name="line-98"></a>
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