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<title>Language/Preprocessor/Cpphs/MacroPass.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 : MacroPass</span>
<a name="line-4"></a><span class='hs-comment'>-- Copyright : 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'>-- Perform a cpp.second-pass, accumulating \#define's and \#undef's,</span>
<a name="line-12"></a><span class='hs-comment'>-- whilst doing symbol replacement and macro expansion.</span>
<a name="line-13"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-14"></a>
<a name="line-15"></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'>MacroPass</span>
<a name="line-16"></a> <span class='hs-layout'>(</span> <span class='hs-varid'>macroPass</span>
<a name="line-17"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>preDefine</span>
<a name="line-18"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>defineMacro</span>
<a name="line-19"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-20"></a>
<a name="line-21"></a><span class='hs-keyword'>import</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'>HashDefine</span> <span class='hs-layout'>(</span><span class='hs-conid'>HashDefine</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>expandMacro</span><span class='hs-layout'>)</span>
<a name="line-22"></a><span class='hs-keyword'>import</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'>Tokenise</span> <span class='hs-layout'>(</span><span class='hs-varid'>tokenise</span><span class='hs-layout'>,</span> <span class='hs-conid'>WordStyle</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-23"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>parseMacroCall</span><span class='hs-layout'>)</span>
<a name="line-24"></a><span class='hs-keyword'>import</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'>SymTab</span> <span class='hs-layout'>(</span><span class='hs-conid'>SymTab</span><span class='hs-layout'>,</span> <span class='hs-varid'>lookupST</span><span class='hs-layout'>,</span> <span class='hs-varid'>insertST</span>
<a name="line-25"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>emptyST</span><span class='hs-layout'>)</span>
<a name="line-26"></a><span class='hs-keyword'>import</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> <span class='hs-layout'>(</span><span class='hs-conid'>Posn</span><span class='hs-layout'>,</span> <span class='hs-varid'>newfile</span><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>
<a name="line-27"></a><span class='hs-keyword'>import</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'>Options</span> <span class='hs-layout'>(</span><span class='hs-conid'>BoolOptions</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-28"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>IO</span><span class='hs-varop'>.</span><span class='hs-conid'>Unsafe</span> <span class='hs-layout'>(</span><span class='hs-varid'>unsafeInterleaveIO</span><span class='hs-layout'>)</span>
<a name="line-29"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varop'>=<<</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-30"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>Time</span> <span class='hs-layout'>(</span><span class='hs-varid'>getClockTime</span><span class='hs-layout'>,</span> <span class='hs-varid'>toCalendarTime</span><span class='hs-layout'>,</span> <span class='hs-varid'>formatCalendarTime</span><span class='hs-layout'>)</span>
<a name="line-31"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>Locale</span> <span class='hs-layout'>(</span><span class='hs-varid'>defaultTimeLocale</span><span class='hs-layout'>)</span>
<a name="line-32"></a>
<a name="line-33"></a><a name="noPos"></a><span class='hs-definition'>noPos</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Posn</span>
<a name="line-34"></a><span class='hs-definition'>noPos</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>newfile</span> <span class='hs-str'>"preDefined"</span>
<a name="line-35"></a>
<a name="line-36"></a><a name="macroPass"></a><span class='hs-comment'>-- | Walk through the document, replacing calls of macros with the expanded RHS.</span>
<a name="line-37"></a><span class='hs-definition'>macroPass</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>String</span><span class='hs-layout'>,</span><span class='hs-conid'>String</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span> <span class='hs-comment'>-- ^ Pre-defined symbols and their values</span>
<a name="line-38"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>BoolOptions</span> <span class='hs-comment'>-- ^ Options that alter processing style</span>
<a name="line-39"></a> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>Posn</span><span class='hs-layout'>,</span><span class='hs-conid'>String</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span> <span class='hs-comment'>-- ^ The input file content</span>
<a name="line-40"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>String</span> <span class='hs-comment'>-- ^ The file after processing</span>
<a name="line-41"></a><span class='hs-definition'>macroPass</span> <span class='hs-varid'>syms</span> <span class='hs-varid'>options</span> <span class='hs-keyglyph'>=</span>
<a name="line-42"></a> <span class='hs-varid'>fmap</span> <span class='hs-layout'>(</span><span class='hs-varid'>safetail</span> <span class='hs-comment'>-- to remove extra "\n" inserted below</span>
<a name="line-43"></a> <span class='hs-varop'>.</span> <span class='hs-varid'>concat</span><span class='hs-layout'>)</span>
<a name="line-44"></a> <span class='hs-varop'>.</span> <span class='hs-varid'>macroProcess</span> <span class='hs-layout'>(</span><span class='hs-varid'>pragma</span> <span class='hs-varid'>options</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>layout</span> <span class='hs-varid'>options</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>lang</span> <span class='hs-varid'>options</span><span class='hs-layout'>)</span>
<a name="line-45"></a> <span class='hs-layout'>(</span><span class='hs-varid'>preDefine</span> <span class='hs-varid'>options</span> <span class='hs-varid'>syms</span><span class='hs-layout'>)</span>
<a name="line-46"></a> <span class='hs-varop'>.</span> <span class='hs-varid'>tokenise</span> <span class='hs-layout'>(</span><span class='hs-varid'>stripEol</span> <span class='hs-varid'>options</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>stripC89</span> <span class='hs-varid'>options</span><span class='hs-layout'>)</span>
<a name="line-47"></a> <span class='hs-layout'>(</span><span class='hs-varid'>ansi</span> <span class='hs-varid'>options</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>lang</span> <span class='hs-varid'>options</span><span class='hs-layout'>)</span>
<a name="line-48"></a> <span class='hs-varop'>.</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varid'>noPos</span><span class='hs-layout'>,</span><span class='hs-str'>""</span><span class='hs-layout'>)</span><span class='hs-conop'>:</span><span class='hs-layout'>)</span> <span class='hs-comment'>-- ensure recognition of "\n#" at start of file</span>
<a name="line-49"></a> <span class='hs-keyword'>where</span>
<a name="line-50"></a> <span class='hs-varid'>safetail</span> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>[]</span>
<a name="line-51"></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'>xs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>xs</span>
<a name="line-52"></a>
<a name="line-53"></a>
<a name="line-54"></a><a name="preDefine"></a><span class='hs-comment'>-- | Turn command-line definitions (from @-D@) into 'HashDefine's.</span>
<a name="line-55"></a><span class='hs-definition'>preDefine</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>BoolOptions</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>String</span><span class='hs-layout'>,</span><span class='hs-conid'>String</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>SymTab</span> <span class='hs-conid'>HashDefine</span>
<a name="line-56"></a><span class='hs-definition'>preDefine</span> <span class='hs-varid'>options</span> <span class='hs-varid'>defines</span> <span class='hs-keyglyph'>=</span>
<a name="line-57"></a> <span class='hs-varid'>foldr</span> <span class='hs-layout'>(</span><span class='hs-varid'>insertST</span> <span class='hs-varop'>.</span> <span class='hs-varid'>defineMacro</span> <span class='hs-varid'>options</span> <span class='hs-varop'>.</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span> <span class='hs-layout'>(</span><span class='hs-varid'>s</span><span class='hs-layout'>,</span><span class='hs-varid'>d</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>-></span> <span class='hs-varid'>s</span><span class='hs-varop'>++</span><span class='hs-str'>" "</span><span class='hs-varop'>++</span><span class='hs-varid'>d</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-58"></a> <span class='hs-varid'>emptyST</span> <span class='hs-varid'>defines</span>
<a name="line-59"></a>
<a name="line-60"></a><a name="defineMacro"></a><span class='hs-comment'>-- | Turn a string representing a macro definition into a 'HashDefine'.</span>
<a name="line-61"></a><span class='hs-definition'>defineMacro</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>BoolOptions</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>String</span><span class='hs-layout'>,</span><span class='hs-conid'>HashDefine</span><span class='hs-layout'>)</span>
<a name="line-62"></a><span class='hs-definition'>defineMacro</span> <span class='hs-varid'>opts</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span>
<a name="line-63"></a> <span class='hs-keyword'>let</span> <span class='hs-layout'>(</span><span class='hs-conid'>Cmd</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>hd</span><span class='hs-layout'>)</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>tokenise</span> <span class='hs-conid'>True</span> <span class='hs-conid'>True</span> <span class='hs-layout'>(</span><span class='hs-varid'>ansi</span> <span class='hs-varid'>opts</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>lang</span> <span class='hs-varid'>opts</span><span class='hs-layout'>)</span>
<a name="line-64"></a> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-varid'>noPos</span><span class='hs-layout'>,</span><span class='hs-str'>"\n#define "</span><span class='hs-varop'>++</span><span class='hs-varid'>s</span><span class='hs-varop'>++</span><span class='hs-str'>"\n"</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-65"></a> <span class='hs-keyword'>in</span> <span class='hs-layout'>(</span><span class='hs-varid'>name</span> <span class='hs-varid'>hd</span><span class='hs-layout'>,</span> <span class='hs-varid'>hd</span><span class='hs-layout'>)</span>
<a name="line-66"></a>
<a name="line-67"></a>
<a name="line-68"></a><a name="macroProcess"></a><span class='hs-comment'>-- | Trundle through the document, one word at a time, using the WordStyle</span>
<a name="line-69"></a><span class='hs-comment'>-- classification introduced by 'tokenise' to decide whether to expand a</span>
<a name="line-70"></a><span class='hs-comment'>-- word or macro. Encountering a \#define or \#undef causes that symbol to</span>
<a name="line-71"></a><span class='hs-comment'>-- be overwritten in the symbol table. Any other remaining cpp directives</span>
<a name="line-72"></a><span class='hs-comment'>-- are discarded and replaced with blanks, except for \#line markers.</span>
<a name="line-73"></a><span class='hs-comment'>-- All valid identifiers are checked for the presence of a definition</span>
<a name="line-74"></a><span class='hs-comment'>-- of that name in the symbol table, and if so, expanded appropriately.</span>
<a name="line-75"></a><span class='hs-comment'>-- (Bool arguments are: keep pragmas? retain layout? haskell language?)</span>
<a name="line-76"></a><span class='hs-definition'>macroProcess</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Bool</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>SymTab</span> <span class='hs-conid'>HashDefine</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>WordStyle</span><span class='hs-keyglyph'>]</span>
<a name="line-77"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>String</span><span class='hs-keyglyph'>]</span>
<a name="line-78"></a><span class='hs-definition'>macroProcess</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-conid'>[]</span>
<a name="line-79"></a><span class='hs-definition'>macroProcess</span> <span class='hs-varid'>p</span> <span class='hs-varid'>y</span> <span class='hs-varid'>l</span> <span class='hs-varid'>st</span> <span class='hs-layout'>(</span><span class='hs-conid'>Other</span> <span class='hs-varid'>x</span><span class='hs-conop'>:</span> <span class='hs-varid'>ws</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>emit</span> <span class='hs-varid'>x</span> <span class='hs-varop'>$</span> <span class='hs-varid'>macroProcess</span> <span class='hs-varid'>p</span> <span class='hs-varid'>y</span> <span class='hs-varid'>l</span> <span class='hs-varid'>st</span> <span class='hs-varid'>ws</span>
<a name="line-80"></a><span class='hs-definition'>macroProcess</span> <span class='hs-varid'>p</span> <span class='hs-varid'>y</span> <span class='hs-varid'>l</span> <span class='hs-varid'>st</span> <span class='hs-layout'>(</span><span class='hs-conid'>Cmd</span> <span class='hs-conid'>Nothing</span><span class='hs-conop'>:</span> <span class='hs-varid'>ws</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>emit</span> <span class='hs-str'>"\n"</span> <span class='hs-varop'>$</span> <span class='hs-varid'>macroProcess</span> <span class='hs-varid'>p</span> <span class='hs-varid'>y</span> <span class='hs-varid'>l</span> <span class='hs-varid'>st</span> <span class='hs-varid'>ws</span>
<a name="line-81"></a><span class='hs-definition'>macroProcess</span> <span class='hs-varid'>p</span> <span class='hs-varid'>y</span> <span class='hs-varid'>l</span> <span class='hs-varid'>st</span> <span class='hs-layout'>(</span><span class='hs-conid'>Cmd</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-conid'>LineDrop</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span><span class='hs-conop'>:</span> <span class='hs-varid'>ws</span><span class='hs-layout'>)</span>
<a name="line-82"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>emit</span> <span class='hs-str'>"\n"</span> <span class='hs-varop'>$</span>
<a name="line-83"></a> <span class='hs-varid'>emit</span> <span class='hs-varid'>x</span> <span class='hs-varop'>$</span> <span class='hs-varid'>macroProcess</span> <span class='hs-varid'>p</span> <span class='hs-varid'>y</span> <span class='hs-varid'>l</span> <span class='hs-varid'>st</span> <span class='hs-varid'>ws</span>
<a name="line-84"></a><span class='hs-definition'>macroProcess</span> <span class='hs-varid'>pragma</span> <span class='hs-varid'>y</span> <span class='hs-varid'>l</span> <span class='hs-varid'>st</span> <span class='hs-layout'>(</span><span class='hs-conid'>Cmd</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-conid'>Pragma</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span><span class='hs-conop'>:</span> <span class='hs-varid'>ws</span><span class='hs-layout'>)</span>
<a name="line-85"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>pragma</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>emit</span> <span class='hs-str'>"\n"</span> <span class='hs-varop'>$</span> <span class='hs-varid'>emit</span> <span class='hs-varid'>x</span> <span class='hs-varop'>$</span> <span class='hs-varid'>macroProcess</span> <span class='hs-varid'>pragma</span> <span class='hs-varid'>y</span> <span class='hs-varid'>l</span> <span class='hs-varid'>st</span> <span class='hs-varid'>ws</span>
<a name="line-86"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>emit</span> <span class='hs-str'>"\n"</span> <span class='hs-varop'>$</span> <span class='hs-varid'>macroProcess</span> <span class='hs-varid'>pragma</span> <span class='hs-varid'>y</span> <span class='hs-varid'>l</span> <span class='hs-varid'>st</span> <span class='hs-varid'>ws</span>
<a name="line-87"></a><span class='hs-definition'>macroProcess</span> <span class='hs-varid'>p</span> <span class='hs-varid'>layout</span> <span class='hs-varid'>lang</span> <span class='hs-varid'>st</span> <span class='hs-layout'>(</span><span class='hs-conid'>Cmd</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>hd</span><span class='hs-layout'>)</span><span class='hs-conop'>:</span> <span class='hs-varid'>ws</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-88"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-num'>1</span> <span class='hs-varop'>+</span> <span class='hs-varid'>linebreaks</span> <span class='hs-varid'>hd</span> <span class='hs-keyword'>in</span>
<a name="line-89"></a> <span class='hs-varid'>emit</span> <span class='hs-layout'>(</span><span class='hs-varid'>replicate</span> <span class='hs-varid'>n</span> <span class='hs-chr'>'\n'</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span>
<a name="line-90"></a> <span class='hs-varid'>macroProcess</span> <span class='hs-varid'>p</span> <span class='hs-varid'>layout</span> <span class='hs-varid'>lang</span> <span class='hs-layout'>(</span><span class='hs-varid'>insertST</span> <span class='hs-layout'>(</span><span class='hs-varid'>name</span> <span class='hs-varid'>hd</span><span class='hs-layout'>,</span> <span class='hs-varid'>hd</span><span class='hs-layout'>)</span> <span class='hs-varid'>st</span><span class='hs-layout'>)</span> <span class='hs-varid'>ws</span>
<a name="line-91"></a><span class='hs-definition'>macroProcess</span> <span class='hs-varid'>pr</span> <span class='hs-varid'>layout</span> <span class='hs-varid'>lang</span> <span class='hs-varid'>st</span> <span class='hs-layout'>(</span><span class='hs-conid'>Ident</span> <span class='hs-varid'>p</span> <span class='hs-varid'>x</span><span class='hs-conop'>:</span> <span class='hs-varid'>ws</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-92"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>x</span> <span class='hs-keyword'>of</span>
<a name="line-93"></a> <span class='hs-str'>"__FILE__"</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>emit</span> <span class='hs-layout'>(</span><span class='hs-varid'>show</span> <span class='hs-layout'>(</span><span class='hs-varid'>filename</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span><span class='hs-varop'>$</span> <span class='hs-varid'>macroProcess</span> <span class='hs-varid'>pr</span> <span class='hs-varid'>layout</span> <span class='hs-varid'>lang</span> <span class='hs-varid'>st</span> <span class='hs-varid'>ws</span>
<a name="line-94"></a> <span class='hs-str'>"__LINE__"</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>emit</span> <span class='hs-layout'>(</span><span class='hs-varid'>show</span> <span class='hs-layout'>(</span><span class='hs-varid'>lineno</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-varid'>macroProcess</span> <span class='hs-varid'>pr</span> <span class='hs-varid'>layout</span> <span class='hs-varid'>lang</span> <span class='hs-varid'>st</span> <span class='hs-varid'>ws</span>
<a name="line-95"></a> <span class='hs-str'>"__DATE__"</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span> <span class='hs-varid'>w</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>return</span> <span class='hs-varop'>.</span>
<a name="line-96"></a> <span class='hs-varid'>formatCalendarTime</span> <span class='hs-varid'>defaultTimeLocale</span> <span class='hs-str'>"\"%d %b %Y\""</span>
<a name="line-97"></a> <span class='hs-varop'>=<<</span> <span class='hs-varid'>toCalendarTime</span> <span class='hs-varop'>=<<</span> <span class='hs-varid'>getClockTime</span>
<a name="line-98"></a> <span class='hs-varid'>emit</span> <span class='hs-varid'>w</span> <span class='hs-varop'>$</span> <span class='hs-varid'>macroProcess</span> <span class='hs-varid'>pr</span> <span class='hs-varid'>layout</span> <span class='hs-varid'>lang</span> <span class='hs-varid'>st</span> <span class='hs-varid'>ws</span>
<a name="line-99"></a> <span class='hs-str'>"__TIME__"</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span> <span class='hs-varid'>w</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>return</span> <span class='hs-varop'>.</span>
<a name="line-100"></a> <span class='hs-varid'>formatCalendarTime</span> <span class='hs-varid'>defaultTimeLocale</span> <span class='hs-str'>"\"%H:%M:%S\""</span>
<a name="line-101"></a> <span class='hs-varop'>=<<</span> <span class='hs-varid'>toCalendarTime</span> <span class='hs-varop'>=<<</span> <span class='hs-varid'>getClockTime</span>
<a name="line-102"></a> <span class='hs-varid'>emit</span> <span class='hs-varid'>w</span> <span class='hs-varop'>$</span> <span class='hs-varid'>macroProcess</span> <span class='hs-varid'>pr</span> <span class='hs-varid'>layout</span> <span class='hs-varid'>lang</span> <span class='hs-varid'>st</span> <span class='hs-varid'>ws</span>
<a name="line-103"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span>
<a name="line-104"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>lookupST</span> <span class='hs-varid'>x</span> <span class='hs-varid'>st</span> <span class='hs-keyword'>of</span>
<a name="line-105"></a> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>emit</span> <span class='hs-varid'>x</span> <span class='hs-varop'>$</span> <span class='hs-varid'>macroProcess</span> <span class='hs-varid'>pr</span> <span class='hs-varid'>layout</span> <span class='hs-varid'>lang</span> <span class='hs-varid'>st</span> <span class='hs-varid'>ws</span>
<a name="line-106"></a> <span class='hs-conid'>Just</span> <span class='hs-varid'>hd</span> <span class='hs-keyglyph'>-></span>
<a name="line-107"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>hd</span> <span class='hs-keyword'>of</span>
<a name="line-108"></a> <span class='hs-conid'>AntiDefined</span> <span class='hs-layout'>{</span><span class='hs-varid'>name</span><span class='hs-keyglyph'>=</span><span class='hs-varid'>n</span><span class='hs-layout'>}</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>emit</span> <span class='hs-varid'>n</span> <span class='hs-varop'>$</span>
<a name="line-109"></a> <span class='hs-varid'>macroProcess</span> <span class='hs-varid'>pr</span> <span class='hs-varid'>layout</span> <span class='hs-varid'>lang</span> <span class='hs-varid'>st</span> <span class='hs-varid'>ws</span>
<a name="line-110"></a> <span class='hs-conid'>SymbolReplacement</span> <span class='hs-layout'>{</span><span class='hs-varid'>replacement</span><span class='hs-keyglyph'>=</span><span class='hs-varid'>r</span><span class='hs-layout'>}</span> <span class='hs-keyglyph'>-></span>
<a name="line-111"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>r'</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>layout</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>r</span> <span class='hs-keyword'>else</span> <span class='hs-varid'>filter</span> <span class='hs-layout'>(</span><span class='hs-varop'>/=</span><span class='hs-chr'>'\n'</span><span class='hs-layout'>)</span> <span class='hs-varid'>r</span> <span class='hs-keyword'>in</span>
<a name="line-112"></a> <span class='hs-comment'>-- one-level expansion only:</span>
<a name="line-113"></a> <span class='hs-comment'>-- emit r' $ macroProcess layout st ws</span>
<a name="line-114"></a> <span class='hs-comment'>-- multi-level expansion:</span>
<a name="line-115"></a> <span class='hs-varid'>macroProcess</span> <span class='hs-varid'>pr</span> <span class='hs-varid'>layout</span> <span class='hs-varid'>lang</span> <span class='hs-varid'>st</span>
<a name="line-116"></a> <span class='hs-layout'>(</span><span class='hs-varid'>tokenise</span> <span class='hs-conid'>True</span> <span class='hs-conid'>True</span> <span class='hs-conid'>False</span> <span class='hs-varid'>lang</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-varid'>p</span><span class='hs-layout'>,</span><span class='hs-varid'>r'</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-117"></a> <span class='hs-varop'>++</span> <span class='hs-varid'>ws</span><span class='hs-layout'>)</span>
<a name="line-118"></a> <span class='hs-conid'>MacroExpansion</span> <span class='hs-layout'>{</span><span class='hs-layout'>}</span> <span class='hs-keyglyph'>-></span>
<a name="line-119"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>parseMacroCall</span> <span class='hs-varid'>p</span> <span class='hs-varid'>ws</span> <span class='hs-keyword'>of</span>
<a name="line-120"></a> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>emit</span> <span class='hs-varid'>x</span> <span class='hs-varop'>$</span>
<a name="line-121"></a> <span class='hs-varid'>macroProcess</span> <span class='hs-varid'>pr</span> <span class='hs-varid'>layout</span> <span class='hs-varid'>lang</span> <span class='hs-varid'>st</span> <span class='hs-varid'>ws</span>
<a name="line-122"></a> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-varid'>args</span><span class='hs-layout'>,</span><span class='hs-varid'>ws'</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span>
<a name="line-123"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>length</span> <span class='hs-varid'>args</span> <span class='hs-varop'>/=</span> <span class='hs-varid'>length</span> <span class='hs-layout'>(</span><span class='hs-varid'>arguments</span> <span class='hs-varid'>hd</span><span class='hs-layout'>)</span> <span class='hs-keyword'>then</span>
<a name="line-124"></a> <span class='hs-varid'>emit</span> <span class='hs-varid'>x</span> <span class='hs-varop'>$</span> <span class='hs-varid'>macroProcess</span> <span class='hs-varid'>pr</span> <span class='hs-varid'>layout</span> <span class='hs-varid'>lang</span> <span class='hs-varid'>st</span> <span class='hs-varid'>ws</span>
<a name="line-125"></a> <span class='hs-keyword'>else</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>args'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>mapM</span> <span class='hs-layout'>(</span><span class='hs-varid'>fmap</span> <span class='hs-varid'>concat</span> <span class='hs-varop'>.</span>
<a name="line-126"></a> <span class='hs-varid'>macroProcess</span> <span class='hs-varid'>pr</span> <span class='hs-varid'>layout</span>
<a name="line-127"></a> <span class='hs-varid'>lang</span> <span class='hs-varid'>st</span><span class='hs-layout'>)</span>
<a name="line-128"></a> <span class='hs-varid'>args</span>
<a name="line-129"></a> <span class='hs-comment'>-- one-level expansion only:</span>
<a name="line-130"></a> <span class='hs-comment'>-- emit (expandMacro hd args' layout) $</span>
<a name="line-131"></a> <span class='hs-comment'>-- macroProcess layout st ws'</span>
<a name="line-132"></a> <span class='hs-comment'>-- multi-level expansion:</span>
<a name="line-133"></a> <span class='hs-varid'>macroProcess</span> <span class='hs-varid'>pr</span> <span class='hs-varid'>layout</span> <span class='hs-varid'>lang</span> <span class='hs-varid'>st</span>
<a name="line-134"></a> <span class='hs-layout'>(</span><span class='hs-varid'>tokenise</span> <span class='hs-conid'>True</span> <span class='hs-conid'>True</span> <span class='hs-conid'>False</span> <span class='hs-varid'>lang</span>
<a name="line-135"></a> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-varid'>p</span><span class='hs-layout'>,</span><span class='hs-varid'>expandMacro</span> <span class='hs-varid'>hd</span> <span class='hs-varid'>args'</span> <span class='hs-varid'>layout</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-136"></a> <span class='hs-varop'>++</span> <span class='hs-varid'>ws'</span><span class='hs-layout'>)</span>
<a name="line-137"></a>
<a name="line-138"></a><a name="emit"></a><span class='hs-comment'>-- | Useful helper function.</span>
<a name="line-139"></a><span class='hs-definition'>emit</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span>
<a name="line-140"></a><span class='hs-definition'>emit</span> <span class='hs-varid'>x</span> <span class='hs-varid'>io</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>xs</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>unsafeInterleaveIO</span> <span class='hs-varid'>io</span>
<a name="line-141"></a> <span class='hs-varid'>return</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>
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