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<title>src/Hint/List.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE ViewPatterns, PatternGuards #-}</span>
<a name="line-2"></a>
<a name="line-3"></a><span class='hs-comment'>{-
<a name="line-4"></a> Find and match:
<a name="line-5"></a>
<a name="line-6"></a><TEST>
<a name="line-7"></a>yes = 1:2:[] -- [1,2]
<a name="line-8"></a>yes = ['h','e','l','l','o'] -- "hello"
<a name="line-9"></a>
<a name="line-10"></a>-- [a]++b -> a : b, but only if not in a chain of ++'s
<a name="line-11"></a>yes = [x] ++ xs -- x : xs
<a name="line-12"></a>yes = "x" ++ xs -- 'x' : xs
<a name="line-13"></a>no = [x] ++ xs ++ ys
<a name="line-14"></a>no = xs ++ [x] ++ ys
<a name="line-15"></a>yes = [if a then b else c] ++ xs -- (if a then b else c) : xs
<a name="line-16"></a>yes = [1] : [2] : [3] : [4] : [5] : [] -- [[1], [2], [3], [4], [5]]
<a name="line-17"></a>yes = if x == e then l2 ++ xs else [x] ++ check_elem xs -- x : check_elem xs
<a name="line-18"></a>data Yes = Yes (Maybe [Char]) -- Maybe String
<a name="line-19"></a>yes = y :: [Char] -> a -- String -> a
<a name="line-20"></a></TEST>
<a name="line-21"></a>-}</span>
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<a name="line-23"></a>
<a name="line-24"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Hint</span><span class='hs-varop'>.</span><span class='hs-conid'>List</span> <span class='hs-keyword'>where</span>
<a name="line-25"></a>
<a name="line-26"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Hint</span><span class='hs-varop'>.</span><span class='hs-conid'>Type</span>
<a name="line-27"></a>
<a name="line-28"></a>
<a name="line-29"></a><a name="listHint"></a><span class='hs-definition'>listHint</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>DeclHint</span>
<a name="line-30"></a><span class='hs-definition'>listHint</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>listDecl</span>
<a name="line-31"></a>
<a name="line-32"></a><a name="listDecl"></a><span class='hs-definition'>listDecl</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Decl_</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Idea</span><span class='hs-keyglyph'>]</span>
<a name="line-33"></a><span class='hs-definition'>listDecl</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>concatMap</span> <span class='hs-layout'>(</span><span class='hs-varid'>listExp</span> <span class='hs-conid'>False</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>childrenBi</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-varop'>++</span>
<a name="line-34"></a> <span class='hs-varid'>concatMap</span> <span class='hs-varid'>stringType</span> <span class='hs-layout'>(</span><span class='hs-varid'>childrenBi</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span>
<a name="line-35"></a>
<a name="line-36"></a><a name="listExp"></a><span class='hs-comment'>-- boolean = are you in a ++ chain</span>
<a name="line-37"></a><span class='hs-definition'>listExp</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Bool</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Exp_</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Idea</span><span class='hs-keyglyph'>]</span>
<a name="line-38"></a><span class='hs-definition'>listExp</span> <span class='hs-varid'>b</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromParen</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-39"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>null</span> <span class='hs-varid'>res</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>concatMap</span> <span class='hs-layout'>(</span><span class='hs-varid'>listExp</span> <span class='hs-varop'>$</span> <span class='hs-varid'>isAppend</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-varid'>children</span> <span class='hs-varid'>x</span> <span class='hs-keyword'>else</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>head</span> <span class='hs-varid'>res</span><span class='hs-keyglyph'>]</span>
<a name="line-40"></a> <span class='hs-keyword'>where</span>
<a name="line-41"></a> <span class='hs-varid'>res</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>warn</span> <span class='hs-varid'>name</span> <span class='hs-varid'>x</span> <span class='hs-varid'>x2</span> <span class='hs-keyglyph'>|</span> <span class='hs-layout'>(</span><span class='hs-varid'>name</span><span class='hs-layout'>,</span><span class='hs-varid'>f</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>checks</span><span class='hs-layout'>,</span> <span class='hs-conid'>Just</span> <span class='hs-varid'>x2</span> <span class='hs-keyglyph'><-</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>f</span> <span class='hs-varid'>b</span> <span class='hs-varid'>x</span><span class='hs-keyglyph'>]</span><span class='hs-keyglyph'>]</span>
<a name="line-42"></a>
<a name="line-43"></a>
<a name="line-44"></a><a name="isAppend"></a><span class='hs-definition'>isAppend</span> <span class='hs-layout'>(</span><span class='hs-varid'>view</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>App2</span> <span class='hs-varid'>op</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'>op</span> <span class='hs-varop'>~=</span> <span class='hs-str'>"++"</span>
<a name="line-45"></a><span class='hs-definition'>isAppend</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>False</span>
<a name="line-46"></a>
<a name="line-47"></a>
<a name="line-48"></a><a name="checks"></a><span class='hs-definition'>checks</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>let</span> <span class='hs-layout'>(</span><span class='hs-varop'>*</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>(,)</span> <span class='hs-keyword'>in</span>
<a name="line-49"></a> <span class='hs-keyglyph'>[</span><span class='hs-str'>"Use string literal"</span> <span class='hs-varop'>*</span> <span class='hs-varid'>useString</span>
<a name="line-50"></a> <span class='hs-layout'>,</span><span class='hs-str'>"Use list literal"</span> <span class='hs-varop'>*</span> <span class='hs-varid'>useList</span>
<a name="line-51"></a> <span class='hs-layout'>,</span><span class='hs-str'>"Use :"</span> <span class='hs-varop'>*</span> <span class='hs-varid'>useCons</span>
<a name="line-52"></a> <span class='hs-keyglyph'>]</span>
<a name="line-53"></a>
<a name="line-54"></a>
<a name="line-55"></a><a name="useString"></a><span class='hs-definition'>useString</span> <span class='hs-varid'>b</span> <span class='hs-layout'>(</span><span class='hs-conid'>List</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>xs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>xs</span> <span class='hs-varop'>/=</span> <span class='hs-conid'>[]</span> <span class='hs-varop'>&&</span> <span class='hs-varid'>all</span> <span class='hs-varid'>isChar</span> <span class='hs-varid'>xs</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-varop'>$</span> <span class='hs-conid'>Lit</span> <span class='hs-varid'>an</span> <span class='hs-varop'>$</span> <span class='hs-conid'>String</span> <span class='hs-varid'>an</span> <span class='hs-varid'>s</span> <span class='hs-layout'>(</span><span class='hs-varid'>show</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span>
<a name="line-56"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>map</span> <span class='hs-varid'>fromChar</span> <span class='hs-varid'>xs</span>
<a name="line-57"></a><span class='hs-definition'>useString</span> <span class='hs-varid'>b</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Nothing</span>
<a name="line-58"></a>
<a name="line-59"></a><a name="useList"></a><span class='hs-definition'>useList</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fmap</span> <span class='hs-layout'>(</span><span class='hs-conid'>List</span> <span class='hs-varid'>an</span><span class='hs-layout'>)</span> <span class='hs-varop'>.</span> <span class='hs-varid'>f</span> <span class='hs-conid'>True</span>
<a name="line-60"></a> <span class='hs-keyword'>where</span>
<a name="line-61"></a> <span class='hs-varid'>f</span> <span class='hs-varid'>first</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>x</span> <span class='hs-varop'>~=</span> <span class='hs-str'>"[]"</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>first</span> <span class='hs-keyword'>then</span> <span class='hs-conid'>Nothing</span> <span class='hs-keyword'>else</span> <span class='hs-conid'>Just</span> <span class='hs-conid'>[]</span>
<a name="line-62"></a> <span class='hs-varid'>f</span> <span class='hs-varid'>first</span> <span class='hs-layout'>(</span><span class='hs-varid'>view</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>App2</span> <span class='hs-varid'>c</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>c</span> <span class='hs-varop'>~=</span> <span class='hs-str'>":"</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fmap</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-conop'>:</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-varid'>f</span> <span class='hs-conid'>False</span> <span class='hs-varid'>b</span>
<a name="line-63"></a> <span class='hs-varid'>f</span> <span class='hs-varid'>first</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Nothing</span>
<a name="line-64"></a>
<a name="line-65"></a><a name="useCons"></a><span class='hs-definition'>useCons</span> <span class='hs-conid'>False</span> <span class='hs-layout'>(</span><span class='hs-varid'>view</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>App2</span> <span class='hs-varid'>op</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>op</span> <span class='hs-varop'>~=</span> <span class='hs-str'>"++"</span><span class='hs-layout'>,</span> <span class='hs-conid'>Just</span> <span class='hs-varid'>x2</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>f</span> <span class='hs-varid'>x</span><span class='hs-layout'>,</span> <span class='hs-varid'>not</span> <span class='hs-varop'>$</span> <span class='hs-varid'>isAppend</span> <span class='hs-varid'>y</span> <span class='hs-keyglyph'>=</span>
<a name="line-66"></a> <span class='hs-conid'>Just</span> <span class='hs-varop'>$</span> <span class='hs-conid'>InfixApp</span> <span class='hs-varid'>an</span> <span class='hs-varid'>x2</span> <span class='hs-layout'>(</span><span class='hs-conid'>QConOp</span> <span class='hs-varid'>an</span> <span class='hs-varop'>$</span> <span class='hs-varid'>list_cons_name</span> <span class='hs-varid'>an</span><span class='hs-layout'>)</span> <span class='hs-varid'>y</span>
<a name="line-67"></a> <span class='hs-keyword'>where</span>
<a name="line-68"></a> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-conid'>Lit</span> <span class='hs-keyword'>_</span> <span class='hs-layout'>(</span><span class='hs-conid'>String</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>x</span><span class='hs-keyglyph'>]</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-varop'>$</span> <span class='hs-conid'>Lit</span> <span class='hs-varid'>an</span> <span class='hs-varop'>$</span> <span class='hs-conid'>Char</span> <span class='hs-varid'>an</span> <span class='hs-varid'>x</span> <span class='hs-layout'>(</span><span class='hs-varid'>show</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span>
<a name="line-69"></a> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-conid'>List</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>x</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-varop'>$</span> <span class='hs-varid'>paren</span> <span class='hs-varid'>x</span>
<a name="line-70"></a> <span class='hs-varid'>f</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Nothing</span>
<a name="line-71"></a><span class='hs-definition'>useCons</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Nothing</span>
<a name="line-72"></a>
<a name="line-73"></a>
<a name="line-74"></a>
<a name="line-75"></a><a name="typeListChar"></a><span class='hs-definition'>typeListChar</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>TyList</span> <span class='hs-varid'>an</span> <span class='hs-layout'>(</span><span class='hs-conid'>TyCon</span> <span class='hs-varid'>an</span> <span class='hs-layout'>(</span><span class='hs-varid'>toNamed</span> <span class='hs-str'>"Char"</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-76"></a><a name="typeString"></a><span class='hs-definition'>typeString</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>TyCon</span> <span class='hs-varid'>an</span> <span class='hs-layout'>(</span><span class='hs-varid'>toNamed</span> <span class='hs-str'>"String"</span><span class='hs-layout'>)</span>
<a name="line-77"></a>
<a name="line-78"></a>
<a name="line-79"></a><a name="stringType"></a><span class='hs-definition'>stringType</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Type_</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Idea</span><span class='hs-keyglyph'>]</span>
<a name="line-80"></a><span class='hs-definition'>stringType</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromTyParen</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>warn</span> <span class='hs-str'>"Use String"</span> <span class='hs-varid'>x</span> <span class='hs-layout'>(</span><span class='hs-varid'>transform</span> <span class='hs-varid'>f</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>any</span> <span class='hs-layout'>(</span><span class='hs-varop'>=~=</span> <span class='hs-varid'>typeListChar</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-varid'>universe</span> <span class='hs-varid'>x</span><span class='hs-keyglyph'>]</span>
<a name="line-81"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>f</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>x</span> <span class='hs-varop'>=~=</span> <span class='hs-varid'>typeListChar</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>typeString</span> <span class='hs-keyword'>else</span> <span class='hs-varid'>x</span>
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