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<pre><a name="line-1"></a><span class='hs-comment'>-- Tools.hs</span>
<a name="line-2"></a><span class='hs-comment'>--</span>
<a name="line-3"></a><span class='hs-comment'>-- Author: Yoshikuni Jujo <PAF01143@nifty.ne.jp></span>
<a name="line-4"></a><span class='hs-comment'>--</span>
<a name="line-5"></a>
<a name="line-6"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Hidden</span><span class='hs-varop'>.</span><span class='hs-conid'>Tools</span> <span class='hs-layout'>(</span>
<a name="line-7"></a> <span class='hs-varid'>isSymbol</span>
<a name="line-8"></a><span class='hs-layout'>,</span> <span class='hs-varid'>modifyFst</span>
<a name="line-9"></a><span class='hs-layout'>,</span> <span class='hs-varid'>modifySnd</span>
<a name="line-10"></a><span class='hs-layout'>,</span> <span class='hs-varid'>first</span>
<a name="line-11"></a><span class='hs-layout'>,</span> <span class='hs-varid'>second</span>
<a name="line-12"></a><span class='hs-layout'>,</span> <span class='hs-varid'>third</span>
<a name="line-13"></a><span class='hs-layout'>,</span> <span class='hs-varid'>modifyFirst</span>
<a name="line-14"></a><span class='hs-layout'>,</span> <span class='hs-varid'>modifySecond</span>
<a name="line-15"></a><span class='hs-layout'>,</span> <span class='hs-varid'>modifyThird</span>
<a name="line-16"></a><span class='hs-layout'>,</span> <span class='hs-varid'>guardEqual</span>
<a name="line-17"></a><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varop'>|||</span><span class='hs-layout'>)</span>
<a name="line-18"></a><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varop'>&&&</span><span class='hs-layout'>)</span>
<a name="line-19"></a><span class='hs-layout'>,</span> <span class='hs-varid'>isBit7On</span>
<a name="line-20"></a><span class='hs-comment'>-- , bifurcate</span>
<a name="line-21"></a><span class='hs-comment'>-- , cat2funcL</span>
<a name="line-22"></a><span class='hs-layout'>,</span> <span class='hs-varid'>skipRet</span>
<a name="line-23"></a><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varop'>>..></span><span class='hs-layout'>)</span>
<a name="line-24"></a><span class='hs-layout'>,</span> <span class='hs-varid'>ignoreCase</span>
<a name="line-25"></a><span class='hs-layout'>,</span> <span class='hs-varid'>ifM</span>
<a name="line-26"></a><span class='hs-layout'>,</span> <span class='hs-varid'>applyIf</span>
<a name="line-27"></a><span class='hs-layout'>,</span> <span class='hs-varid'>headOrErr</span>
<a name="line-28"></a><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-29"></a>
<a name="line-30"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Char</span> <span class='hs-layout'>(</span> <span class='hs-varid'>ord</span><span class='hs-layout'>,</span> <span class='hs-varid'>toUpper</span><span class='hs-layout'>,</span> <span class='hs-varid'>toLower</span> <span class='hs-layout'>)</span>
<a name="line-31"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Bits</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> <span class='hs-varid'>shiftL</span> <span class='hs-layout'>)</span>
<a name="line-32"></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-conid'>MonadPlus</span><span class='hs-layout'>,</span> <span class='hs-varid'>guard</span> <span class='hs-layout'>)</span>
<a name="line-33"></a>
<a name="line-34"></a><a name="isSymbol"></a><span class='hs-definition'>isSymbol</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-35"></a><span class='hs-definition'>isSymbol</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>flip</span> <span class='hs-varid'>elem</span> <span class='hs-str'>"!\"#$%&'()*+,-./:;<=>?@[\\]^_'{|}~"</span>
<a name="line-36"></a>
<a name="line-37"></a><a name="modifyFst"></a><span class='hs-definition'>modifyFst</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>c</span><span class='hs-layout'>,</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span>
<a name="line-38"></a><span class='hs-definition'>modifyFst</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>,</span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-varid'>x</span><span class='hs-layout'>,</span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span>
<a name="line-39"></a><a name="modifySnd"></a><span class='hs-definition'>modifySnd</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-varid'>b</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span>
<a name="line-40"></a><span class='hs-definition'>modifySnd</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>,</span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>,</span> <span class='hs-varid'>f</span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span>
<a name="line-41"></a>
<a name="line-42"></a><a name="guardEqual"></a><span class='hs-definition'>guardEqual</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>MonadPlus</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>Eq</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-conid'>()</span>
<a name="line-43"></a><span class='hs-definition'>guardEqual</span> <span class='hs-varid'>m1</span> <span class='hs-varid'>m2</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-layout'>{</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>m1</span><span class='hs-layout'>;</span> <span class='hs-varid'>y</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>m2</span><span class='hs-layout'>;</span> <span class='hs-varid'>guard</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span> <span class='hs-varop'>==</span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span> <span class='hs-layout'>}</span>
<a name="line-44"></a>
<a name="line-45"></a><a name="first"></a><span class='hs-definition'>first</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>b</span><span class='hs-layout'>,</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span>
<a name="line-46"></a><span class='hs-definition'>first</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>,</span> <span class='hs-keyword'>_</span><span class='hs-layout'>,</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>x</span>
<a name="line-47"></a><a name="second"></a><span class='hs-definition'>second</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>b</span><span class='hs-layout'>,</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>b</span>
<a name="line-48"></a><span class='hs-definition'>second</span> <span class='hs-layout'>(</span><span class='hs-keyword'>_</span><span class='hs-layout'>,</span> <span class='hs-varid'>y</span><span class='hs-layout'>,</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>y</span>
<a name="line-49"></a><a name="third"></a><span class='hs-definition'>third</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>b</span><span class='hs-layout'>,</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>c</span>
<a name="line-50"></a><span class='hs-definition'>third</span> <span class='hs-layout'>(</span><span class='hs-keyword'>_</span><span class='hs-layout'>,</span> <span class='hs-keyword'>_</span><span class='hs-layout'>,</span> <span class='hs-varid'>z</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>z</span>
<a name="line-51"></a>
<a name="line-52"></a><a name="modifyFirst"></a><span class='hs-definition'>modifyFirst</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>d</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>b</span><span class='hs-layout'>,</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>d</span><span class='hs-layout'>,</span> <span class='hs-varid'>b</span><span class='hs-layout'>,</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span>
<a name="line-53"></a><span class='hs-definition'>modifyFirst</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>,</span> <span class='hs-varid'>y</span><span class='hs-layout'>,</span> <span class='hs-varid'>z</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-varid'>x</span><span class='hs-layout'>,</span> <span class='hs-varid'>y</span><span class='hs-layout'>,</span> <span class='hs-varid'>z</span><span class='hs-layout'>)</span>
<a name="line-54"></a><a name="modifySecond"></a><span class='hs-definition'>modifySecond</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-varid'>b</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>d</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>b</span><span class='hs-layout'>,</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>d</span><span class='hs-layout'>,</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span>
<a name="line-55"></a><span class='hs-definition'>modifySecond</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>,</span> <span class='hs-varid'>y</span><span class='hs-layout'>,</span> <span class='hs-varid'>z</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>,</span> <span class='hs-varid'>f</span> <span class='hs-varid'>y</span><span class='hs-layout'>,</span> <span class='hs-varid'>z</span><span class='hs-layout'>)</span>
<a name="line-56"></a><a name="modifyThird"></a><span class='hs-definition'>modifyThird</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-varid'>c</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>d</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>b</span><span class='hs-layout'>,</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>b</span><span class='hs-layout'>,</span> <span class='hs-varid'>d</span><span class='hs-layout'>)</span>
<a name="line-57"></a><span class='hs-definition'>modifyThird</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>,</span> <span class='hs-varid'>y</span><span class='hs-layout'>,</span> <span class='hs-varid'>z</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>,</span> <span class='hs-varid'>y</span><span class='hs-layout'>,</span> <span class='hs-varid'>f</span> <span class='hs-varid'>z</span><span class='hs-layout'>)</span>
<a name="line-58"></a>
<a name="line-59"></a><a name="|||"></a><span class='hs-layout'>(</span><span class='hs-varop'>|||</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span><span class='hs-layout'>(</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'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span>
<a name="line-60"></a><span class='hs-layout'>(</span><span class='hs-varid'>p1</span> <span class='hs-varop'>|||</span> <span class='hs-varid'>p2</span><span class='hs-layout'>)</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>p1</span> <span class='hs-varid'>x</span> <span class='hs-varop'>||</span> <span class='hs-varid'>p2</span> <span class='hs-varid'>x</span>
<a name="line-61"></a><span class='hs-layout'>(</span><span class='hs-varid'>p1</span> <span class='hs-varop'>&&&</span> <span class='hs-varid'>p2</span><span class='hs-layout'>)</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>p1</span> <span class='hs-varid'>x</span> <span class='hs-varop'>&&</span> <span class='hs-varid'>p2</span> <span class='hs-varid'>x</span>
<a name="line-62"></a>
<a name="line-63"></a><a name="isBit7On"></a><span class='hs-definition'>isBit7On</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-64"></a><span class='hs-definition'>isBit7On</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>ord</span> <span class='hs-varid'>c</span> <span class='hs-varop'>.&.</span> <span class='hs-varid'>shiftL</span> <span class='hs-num'>1</span> <span class='hs-num'>7</span> <span class='hs-varop'>/=</span> <span class='hs-num'>0</span>
<a name="line-65"></a>
<a name="line-66"></a><span class='hs-comment'>{-
<a name="line-67"></a>bifurcate :: (a -> a -> b) -> a -> b
<a name="line-68"></a>bifurcate f x = f x x
<a name="line-69"></a>
<a name="line-70"></a>cat2funcL :: (a -> c) -> (b -> c) -> a -> b -> [c]
<a name="line-71"></a>cat2funcL f g x y = [f x, g y ]
<a name="line-72"></a>-}</span>
<a name="line-73"></a>
<a name="line-74"></a><a name="skipRet"></a><span class='hs-definition'>skipRet</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Monad</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>m</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span>
<a name="line-75"></a><span class='hs-definition'>skipRet</span> <span class='hs-varid'>p</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>p</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-varid'>x</span>
<a name="line-76"></a>
<a name="line-77"></a><a name=">..>"></a><span class='hs-layout'>(</span><span class='hs-varop'>>..></span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Monad</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span>
<a name="line-78"></a><a name="m1"></a><span class='hs-definition'>m1</span> <span class='hs-varop'>>..></span> <span class='hs-varid'>m2</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-layout'>{</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>m1</span><span class='hs-layout'>;</span> <span class='hs-varid'>y</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>m2</span><span class='hs-layout'>;</span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>,</span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span> <span class='hs-layout'>}</span>
<a name="line-79"></a>
<a name="line-80"></a><a name="ignoreCase"></a><span class='hs-definition'>ignoreCase</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span><span class='hs-layout'>)</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-81"></a><span class='hs-definition'>ignoreCase</span> <span class='hs-varid'>p</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>p</span> <span class='hs-layout'>(</span><span class='hs-varid'>toLower</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-varop'>||</span> <span class='hs-varid'>p</span> <span class='hs-layout'>(</span><span class='hs-varid'>toUpper</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span>
<a name="line-82"></a>
<a name="line-83"></a><a name="ifM"></a><span class='hs-definition'>ifM</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Monad</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>m</span> <span class='hs-conid'>Bool</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span>
<a name="line-84"></a><span class='hs-definition'>ifM</span> <span class='hs-varid'>p</span> <span class='hs-varid'>mt</span> <span class='hs-varid'>me</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>p</span>
<a name="line-85"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>b</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>mt</span>
<a name="line-86"></a> <span class='hs-keyword'>else</span> <span class='hs-varid'>me</span>
<a name="line-87"></a>
<a name="line-88"></a><a name="applyIf"></a><span class='hs-definition'>applyIf</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Bool</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span>
<a name="line-89"></a><span class='hs-definition'>applyIf</span> <span class='hs-conid'>True</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>f</span>
<a name="line-90"></a><span class='hs-definition'>applyIf</span> <span class='hs-conid'>False</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>id</span>
<a name="line-91"></a>
<a name="line-92"></a><a name="headOrErr"></a><span class='hs-definition'>headOrErr</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-varid'>a</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span>
<a name="line-93"></a><span class='hs-definition'>headOrErr</span> <span class='hs-varid'>err</span> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>error</span> <span class='hs-varid'>err</span>
<a name="line-94"></a><span class='hs-definition'>headOrErr</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-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>x</span>
</pre></body>
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