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<title>Language/Preprocessor/Unlit.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>-- | Part of this code is from "Report on the Programming Language Haskell",</span>
<a name="line-2"></a><span class='hs-comment'>-- version 1.2, appendix C.</span>
<a name="line-3"></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'>Unlit</span> <span class='hs-layout'>(</span><span class='hs-varid'>unlit</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-4"></a>
<a name="line-5"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Char</span>
<a name="line-6"></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-7"></a>
<a name="line-8"></a><a name="Classified"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>Classified</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Program</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Blank</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Comment</span>
<a name="line-9"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Include</span> <span class='hs-conid'>Int</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Pre</span> <span class='hs-conid'>String</span>
<a name="line-10"></a>
<a name="line-11"></a><a name="classify"></a><span class='hs-definition'>classify</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>String</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Classified</span><span class='hs-keyglyph'>]</span>
<a name="line-12"></a><span class='hs-definition'>classify</span> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>[]</span>
<a name="line-13"></a><span class='hs-definition'>classify</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-chr'>'\\'</span><span class='hs-conop'>:</span><span class='hs-varid'>x</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> <span class='hs-varid'>x</span> <span class='hs-varop'>==</span> <span class='hs-str'>"begin{code}"</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Blank</span> <span class='hs-conop'>:</span> <span class='hs-varid'>allProg</span> <span class='hs-varid'>xs</span>
<a name="line-14"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>allProg</span> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>[]</span> <span class='hs-comment'>-- Should give an error message,</span>
<a name="line-15"></a> <span class='hs-comment'>-- but I have no good position information.</span>
<a name="line-16"></a> <span class='hs-varid'>allProg</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-chr'>'\\'</span><span class='hs-conop'>:</span><span class='hs-varid'>x</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> <span class='hs-str'>"end{code}"</span><span class='hs-varop'>`isPrefixOf`</span><span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Blank</span> <span class='hs-conop'>:</span> <span class='hs-varid'>classify</span> <span class='hs-varid'>xs</span>
<a name="line-17"></a> <span class='hs-varid'>allProg</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-conop'>:</span><span class='hs-varid'>xs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Program</span> <span class='hs-varid'>x</span><span class='hs-conop'>:</span><span class='hs-varid'>allProg</span> <span class='hs-varid'>xs</span>
<a name="line-18"></a><span class='hs-definition'>classify</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-chr'>'>'</span><span class='hs-conop'>:</span><span class='hs-varid'>x</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> <span class='hs-conid'>Program</span> <span class='hs-layout'>(</span><span class='hs-chr'>' '</span><span class='hs-conop'>:</span><span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-conop'>:</span> <span class='hs-varid'>classify</span> <span class='hs-varid'>xs</span>
<a name="line-19"></a><span class='hs-definition'>classify</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-chr'>'#'</span><span class='hs-conop'>:</span><span class='hs-varid'>x</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> <span class='hs-layout'>(</span><span class='hs-keyword'>case</span> <span class='hs-varid'>words</span> <span class='hs-varid'>x</span> <span class='hs-keyword'>of</span>
<a name="line-20"></a> <span class='hs-layout'>(</span><span class='hs-varid'>line</span><span class='hs-conop'>:</span><span class='hs-varid'>rest</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>all</span> <span class='hs-varid'>isDigit</span> <span class='hs-varid'>line</span>
<a name="line-21"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Include</span> <span class='hs-layout'>(</span><span class='hs-varid'>read</span> <span class='hs-varid'>line</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>unwords</span> <span class='hs-varid'>rest</span><span class='hs-layout'>)</span>
<a name="line-22"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Pre</span> <span class='hs-varid'>x</span>
<a name="line-23"></a> <span class='hs-layout'>)</span> <span class='hs-conop'>:</span> <span class='hs-varid'>classify</span> <span class='hs-varid'>xs</span>
<a name="line-24"></a><span class='hs-definition'>classify</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-conop'>:</span><span class='hs-varid'>xs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>all</span> <span class='hs-varid'>isSpace</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Blank</span><span class='hs-conop'>:</span><span class='hs-varid'>classify</span> <span class='hs-varid'>xs</span>
<a name="line-25"></a><span class='hs-definition'>classify</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-conop'>:</span><span class='hs-varid'>xs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Comment</span><span class='hs-conop'>:</span><span class='hs-varid'>classify</span> <span class='hs-varid'>xs</span>
<a name="line-26"></a>
<a name="line-27"></a><a name="unclassify"></a><span class='hs-definition'>unclassify</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Classified</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span>
<a name="line-28"></a><span class='hs-definition'>unclassify</span> <span class='hs-layout'>(</span><span class='hs-conid'>Program</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>s</span>
<a name="line-29"></a><span class='hs-definition'>unclassify</span> <span class='hs-layout'>(</span><span class='hs-conid'>Pre</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-chr'>'#'</span><span class='hs-conop'>:</span><span class='hs-varid'>s</span>
<a name="line-30"></a><span class='hs-definition'>unclassify</span> <span class='hs-layout'>(</span><span class='hs-conid'>Include</span> <span class='hs-varid'>i</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-chr'>'#'</span><span class='hs-conop'>:</span><span class='hs-chr'>' '</span><span class='hs-conop'>:</span><span class='hs-varid'>show</span> <span class='hs-varid'>i</span> <span class='hs-varop'>++</span> <span class='hs-chr'>' '</span><span class='hs-conop'>:</span><span class='hs-varid'>f</span>
<a name="line-31"></a><span class='hs-definition'>unclassify</span> <span class='hs-conid'>Blank</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>""</span>
<a name="line-32"></a><span class='hs-definition'>unclassify</span> <span class='hs-conid'>Comment</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>""</span>
<a name="line-33"></a>
<a name="line-34"></a><a name="unlit"></a><span class='hs-comment'>-- | 'unlit' takes a filename (for error reports), and transforms the</span>
<a name="line-35"></a><span class='hs-comment'>-- given string, to eliminate the literate comments from the program text.</span>
<a name="line-36"></a><span class='hs-definition'>unlit</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>FilePath</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-37"></a><span class='hs-definition'>unlit</span> <span class='hs-varid'>file</span> <span class='hs-varid'>lhs</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>unlines</span>
<a name="line-38"></a> <span class='hs-varop'>.</span> <span class='hs-varid'>map</span> <span class='hs-varid'>unclassify</span>
<a name="line-39"></a> <span class='hs-varop'>.</span> <span class='hs-varid'>adjacent</span> <span class='hs-varid'>file</span> <span class='hs-layout'>(</span><span class='hs-num'>0</span><span class='hs-keyglyph'>::</span><span class='hs-conid'>Int</span><span class='hs-layout'>)</span> <span class='hs-conid'>Blank</span>
<a name="line-40"></a> <span class='hs-varop'>.</span> <span class='hs-varid'>classify</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>inlines</span> <span class='hs-varid'>lhs</span><span class='hs-layout'>)</span>
<a name="line-41"></a>
<a name="line-42"></a><a name="adjacent"></a><span class='hs-definition'>adjacent</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>FilePath</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Classified</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Classified</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Classified</span><span class='hs-keyglyph'>]</span>
<a name="line-43"></a><span class='hs-definition'>adjacent</span> <span class='hs-varid'>file</span> <span class='hs-num'>0</span> <span class='hs-keyword'>_</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span> <span class='hs-conop'>:</span><span class='hs-varid'>xs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>x</span> <span class='hs-conop'>:</span> <span class='hs-varid'>adjacent</span> <span class='hs-varid'>file</span> <span class='hs-num'>1</span> <span class='hs-varid'>x</span> <span class='hs-varid'>xs</span> <span class='hs-comment'>-- force evaluation of line number</span>
<a name="line-44"></a><span class='hs-definition'>adjacent</span> <span class='hs-varid'>file</span> <span class='hs-varid'>n</span> <span class='hs-varid'>y</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>Program</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-keyglyph'>@</span><span class='hs-conid'>Comment</span> <span class='hs-conop'>:</span><span class='hs-varid'>xs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>error</span> <span class='hs-layout'>(</span><span class='hs-varid'>message</span> <span class='hs-varid'>file</span> <span class='hs-varid'>n</span> <span class='hs-str'>"program"</span> <span class='hs-str'>"comment"</span><span class='hs-layout'>)</span>
<a name="line-45"></a><span class='hs-definition'>adjacent</span> <span class='hs-varid'>file</span> <span class='hs-varid'>n</span> <span class='hs-varid'>y</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>Program</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>Include</span> <span class='hs-varid'>i</span> <span class='hs-varid'>f</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> <span class='hs-varid'>x</span><span class='hs-conop'>:</span> <span class='hs-varid'>adjacent</span> <span class='hs-varid'>f</span> <span class='hs-varid'>i</span> <span class='hs-varid'>y</span> <span class='hs-varid'>xs</span>
<a name="line-46"></a><span class='hs-definition'>adjacent</span> <span class='hs-varid'>file</span> <span class='hs-varid'>n</span> <span class='hs-varid'>y</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>Program</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>Pre</span> <span class='hs-keyword'>_</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> <span class='hs-varid'>x</span><span class='hs-conop'>:</span> <span class='hs-varid'>adjacent</span> <span class='hs-varid'>file</span> <span class='hs-layout'>(</span><span class='hs-varid'>n</span><span class='hs-varop'>+</span><span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varid'>y</span> <span class='hs-varid'>xs</span>
<a name="line-47"></a><span class='hs-definition'>adjacent</span> <span class='hs-varid'>file</span> <span class='hs-varid'>n</span> <span class='hs-varid'>y</span><span class='hs-keyglyph'>@</span><span class='hs-conid'>Comment</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>Program</span> <span class='hs-keyword'>_</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> <span class='hs-varid'>error</span> <span class='hs-layout'>(</span><span class='hs-varid'>message</span> <span class='hs-varid'>file</span> <span class='hs-varid'>n</span> <span class='hs-str'>"comment"</span> <span class='hs-str'>"program"</span><span class='hs-layout'>)</span>
<a name="line-48"></a><span class='hs-definition'>adjacent</span> <span class='hs-varid'>file</span> <span class='hs-varid'>n</span> <span class='hs-varid'>y</span><span class='hs-keyglyph'>@</span><span class='hs-conid'>Comment</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>Include</span> <span class='hs-varid'>i</span> <span class='hs-varid'>f</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> <span class='hs-varid'>x</span><span class='hs-conop'>:</span> <span class='hs-varid'>adjacent</span> <span class='hs-varid'>f</span> <span class='hs-varid'>i</span> <span class='hs-varid'>y</span> <span class='hs-varid'>xs</span>
<a name="line-49"></a><span class='hs-definition'>adjacent</span> <span class='hs-varid'>file</span> <span class='hs-varid'>n</span> <span class='hs-varid'>y</span><span class='hs-keyglyph'>@</span><span class='hs-conid'>Comment</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>Pre</span> <span class='hs-keyword'>_</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> <span class='hs-varid'>x</span><span class='hs-conop'>:</span> <span class='hs-varid'>adjacent</span> <span class='hs-varid'>file</span> <span class='hs-layout'>(</span><span class='hs-varid'>n</span><span class='hs-varop'>+</span><span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varid'>y</span> <span class='hs-varid'>xs</span>
<a name="line-50"></a><span class='hs-definition'>adjacent</span> <span class='hs-varid'>file</span> <span class='hs-varid'>n</span> <span class='hs-varid'>y</span><span class='hs-keyglyph'>@</span><span class='hs-conid'>Blank</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>Include</span> <span class='hs-varid'>i</span> <span class='hs-varid'>f</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> <span class='hs-varid'>x</span><span class='hs-conop'>:</span> <span class='hs-varid'>adjacent</span> <span class='hs-varid'>f</span> <span class='hs-varid'>i</span> <span class='hs-varid'>y</span> <span class='hs-varid'>xs</span>
<a name="line-51"></a><span class='hs-definition'>adjacent</span> <span class='hs-varid'>file</span> <span class='hs-varid'>n</span> <span class='hs-varid'>y</span><span class='hs-keyglyph'>@</span><span class='hs-conid'>Blank</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>Pre</span> <span class='hs-keyword'>_</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> <span class='hs-varid'>x</span><span class='hs-conop'>:</span> <span class='hs-varid'>adjacent</span> <span class='hs-varid'>file</span> <span class='hs-layout'>(</span><span class='hs-varid'>n</span><span class='hs-varop'>+</span><span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varid'>y</span> <span class='hs-varid'>xs</span>
<a name="line-52"></a><span class='hs-definition'>adjacent</span> <span class='hs-varid'>file</span> <span class='hs-varid'>n</span> <span class='hs-keyword'>_</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-keyglyph'>@</span><span class='hs-varid'>next</span> <span class='hs-conop'>:</span><span class='hs-varid'>xs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>x</span><span class='hs-conop'>:</span> <span class='hs-varid'>adjacent</span> <span class='hs-varid'>file</span> <span class='hs-layout'>(</span><span class='hs-varid'>n</span><span class='hs-varop'>+</span><span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varid'>x</span> <span class='hs-varid'>xs</span>
<a name="line-53"></a><span class='hs-definition'>adjacent</span> <span class='hs-varid'>file</span> <span class='hs-varid'>n</span> <span class='hs-keyword'>_</span> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>[]</span>
<a name="line-54"></a>
<a name="line-55"></a><a name="message"></a><span class='hs-definition'>message</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</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-56"></a><span class='hs-definition'>message</span> <span class='hs-str'>"\"\""</span> <span class='hs-varid'>n</span> <span class='hs-varid'>p</span> <span class='hs-varid'>c</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'>n</span><span class='hs-varop'>++</span><span class='hs-str'>": "</span><span class='hs-varop'>++</span><span class='hs-varid'>p</span><span class='hs-varop'>++</span> <span class='hs-str'>" line before "</span><span class='hs-varop'>++</span><span class='hs-varid'>c</span><span class='hs-varop'>++</span><span class='hs-str'>" line.\n"</span>
<a name="line-57"></a><span class='hs-definition'>message</span> <span class='hs-conid'>[]</span> <span class='hs-varid'>n</span> <span class='hs-varid'>p</span> <span class='hs-varid'>c</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'>n</span><span class='hs-varop'>++</span><span class='hs-str'>": "</span><span class='hs-varop'>++</span><span class='hs-varid'>p</span><span class='hs-varop'>++</span> <span class='hs-str'>" line before "</span><span class='hs-varop'>++</span><span class='hs-varid'>c</span><span class='hs-varop'>++</span><span class='hs-str'>" line.\n"</span>
<a name="line-58"></a><span class='hs-definition'>message</span> <span class='hs-varid'>file</span> <span class='hs-varid'>n</span> <span class='hs-varid'>p</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"In file "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>file</span> <span class='hs-varop'>++</span> <span class='hs-str'>" at line "</span><span class='hs-varop'>++</span><span class='hs-varid'>show</span> <span class='hs-varid'>n</span><span class='hs-varop'>++</span><span class='hs-str'>": "</span><span class='hs-varop'>++</span><span class='hs-varid'>p</span><span class='hs-varop'>++</span> <span class='hs-str'>" line before "</span><span class='hs-varop'>++</span><span class='hs-varid'>c</span><span class='hs-varop'>++</span><span class='hs-str'>" line.\n"</span>
<a name="line-59"></a>
<a name="line-60"></a>
<a name="line-61"></a><a name="inlines"></a><span class='hs-comment'>-- Re-implementation of 'lines', for better efficiency (but decreased laziness).</span>
<a name="line-62"></a><span class='hs-comment'>-- Also, importantly, accepts non-standard DOS and Mac line ending characters.</span>
<a name="line-63"></a><span class='hs-definition'>inlines</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>String</span><span class='hs-keyglyph'>]</span>
<a name="line-64"></a><span class='hs-definition'>inlines</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>lines'</span> <span class='hs-varid'>s</span> <span class='hs-varid'>id</span>
<a name="line-65"></a> <span class='hs-keyword'>where</span>
<a name="line-66"></a> <span class='hs-varid'>lines'</span> <span class='hs-conid'>[]</span> <span class='hs-varid'>acc</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>acc</span> <span class='hs-conid'>[]</span><span class='hs-keyglyph'>]</span>
<a name="line-67"></a> <span class='hs-varid'>lines'</span> <span class='hs-layout'>(</span><span class='hs-chr'>'\^M'</span><span class='hs-conop'>:</span><span class='hs-chr'>'\n'</span><span class='hs-conop'>:</span><span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-varid'>acc</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>acc</span> <span class='hs-conid'>[]</span> <span class='hs-conop'>:</span> <span class='hs-varid'>lines'</span> <span class='hs-varid'>s</span> <span class='hs-varid'>id</span> <span class='hs-comment'>-- DOS</span>
<a name="line-68"></a> <span class='hs-varid'>lines'</span> <span class='hs-layout'>(</span><span class='hs-chr'>'\^M'</span><span class='hs-conop'>:</span><span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-varid'>acc</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>acc</span> <span class='hs-conid'>[]</span> <span class='hs-conop'>:</span> <span class='hs-varid'>lines'</span> <span class='hs-varid'>s</span> <span class='hs-varid'>id</span> <span class='hs-comment'>-- MacOS</span>
<a name="line-69"></a> <span class='hs-varid'>lines'</span> <span class='hs-layout'>(</span><span class='hs-chr'>'\n'</span><span class='hs-conop'>:</span><span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-varid'>acc</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>acc</span> <span class='hs-conid'>[]</span> <span class='hs-conop'>:</span> <span class='hs-varid'>lines'</span> <span class='hs-varid'>s</span> <span class='hs-varid'>id</span> <span class='hs-comment'>-- Unix</span>
<a name="line-70"></a> <span class='hs-varid'>lines'</span> <span class='hs-layout'>(</span><span class='hs-varid'>c</span><span class='hs-conop'>:</span><span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-varid'>acc</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>lines'</span> <span class='hs-varid'>s</span> <span class='hs-layout'>(</span><span class='hs-varid'>acc</span> <span class='hs-varop'>.</span> <span class='hs-layout'>(</span><span class='hs-varid'>c</span><span class='hs-conop'>:</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-71"></a>
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