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<pre><a name="line-1"></a><span class='hs-comment'>-- | This module abstracts the differences between implementations of </span>
<a name="line-2"></a><span class='hs-comment'>-- Haskell (e.g., GHC, Hugs, and NHC).</span>
<a name="line-3"></a>
<a name="line-4"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Test</span><span class='hs-varop'>.</span><span class='hs-conid'>HUnit</span><span class='hs-varop'>.</span><span class='hs-conid'>Lang</span>
<a name="line-5"></a><span class='hs-layout'>(</span>
<a name="line-6"></a> <span class='hs-conid'>Assertion</span><span class='hs-layout'>,</span>
<a name="line-7"></a> <span class='hs-varid'>assertFailure</span><span class='hs-layout'>,</span>
<a name="line-8"></a> <span class='hs-varid'>performTestCase</span>
<a name="line-9"></a><span class='hs-layout'>)</span>
<a name="line-10"></a><span class='hs-keyword'>where</span>
<a name="line-11"></a>
<a name="line-12"></a>
<a name="line-13"></a><span class='hs-comment'>-- When adapting this module for other Haskell language systems, change</span>
<a name="line-14"></a><span class='hs-comment'>-- the imports and the implementations but not the interfaces.</span>
<a name="line-15"></a>
<a name="line-16"></a>
<a name="line-17"></a>
<a name="line-18"></a><span class='hs-comment'>-- Imports</span>
<a name="line-19"></a><span class='hs-comment'>-- -------</span>
<a name="line-20"></a>
<a name="line-21"></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-22"></a><span class='hs-cpp'>#if defined(__GLASGOW_HASKELL__) || defined(__HUGS__)</span>
<a name="line-23"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Dynamic</span>
<a name="line-24"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Exception</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>E</span>
<a name="line-25"></a><span class='hs-cpp'>#else</span>
<a name="line-26"></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'>Error</span> <span class='hs-layout'>(</span><span class='hs-varid'>ioeGetErrorString</span><span class='hs-layout'>,</span> <span class='hs-varid'>try</span><span class='hs-layout'>)</span>
<a name="line-27"></a><span class='hs-cpp'>#endif</span>
<a name="line-28"></a>
<a name="line-29"></a>
<a name="line-30"></a>
<a name="line-31"></a><span class='hs-comment'>-- Interfaces</span>
<a name="line-32"></a><span class='hs-comment'>-- ----------</span>
<a name="line-33"></a>
<a name="line-34"></a><span class='hs-comment'>-- | When an assertion is evaluated, it will output a message if and only if the</span>
<a name="line-35"></a><span class='hs-comment'>-- assertion fails. </span>
<a name="line-36"></a><span class='hs-comment'>--</span>
<a name="line-37"></a><span class='hs-comment'>-- Test cases are composed of a sequence of one or more assertions.</span>
<a name="line-38"></a>
<a name="line-39"></a><a name="Assertion"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>Assertion</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-40"></a>
<a name="line-41"></a><span class='hs-comment'>-- | Unconditionally signals that a failure has occured. All</span>
<a name="line-42"></a><span class='hs-comment'>-- other assertions can be expressed with the form:</span>
<a name="line-43"></a><span class='hs-comment'>--</span>
<a name="line-44"></a><span class='hs-comment'>-- @</span>
<a name="line-45"></a><span class='hs-comment'>-- if conditionIsMet </span>
<a name="line-46"></a><span class='hs-comment'>-- then IO () </span>
<a name="line-47"></a><span class='hs-comment'>-- else assertFailure msg</span>
<a name="line-48"></a><span class='hs-comment'>-- @ </span>
<a name="line-49"></a>
<a name="line-50"></a><a name="assertFailure"></a><span class='hs-definition'>assertFailure</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-comment'>-- ^ A message that is displayed with the assertion failure </span>
<a name="line-51"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Assertion</span>
<a name="line-52"></a>
<a name="line-53"></a><span class='hs-comment'>-- | Performs a single test case. The meaning of the result is as follows:</span>
<a name="line-54"></a><span class='hs-comment'>--</span>
<a name="line-55"></a><span class='hs-comment'>-- [@Nothing@] test case success</span>
<a name="line-56"></a><span class='hs-comment'>--</span>
<a name="line-57"></a><span class='hs-comment'>-- [@Just (True, msg)@] test case failure with the given message</span>
<a name="line-58"></a><span class='hs-comment'>--</span>
<a name="line-59"></a><span class='hs-comment'>-- [@Just (False, msg)@] test case error with the given message</span>
<a name="line-60"></a>
<a name="line-61"></a><a name="performTestCase"></a><span class='hs-definition'>performTestCase</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Assertion</span> <span class='hs-comment'>-- ^ an assertion to be made during the test case run </span>
<a name="line-62"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-layout'>(</span><span class='hs-conid'>Maybe</span> <span class='hs-layout'>(</span><span class='hs-conid'>Bool</span><span class='hs-layout'>,</span> <span class='hs-conid'>String</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-63"></a>
<a name="line-64"></a>
<a name="line-65"></a><span class='hs-comment'>-- Implementations</span>
<a name="line-66"></a><span class='hs-comment'>-- ---------------</span>
<a name="line-67"></a>
<a name="line-68"></a><span class='hs-cpp'>#if defined(__GLASGOW_HASKELL__) || defined(__HUGS__)</span>
<a name="line-69"></a><a name="HUnitFailure"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>HUnitFailure</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>HUnitFailure</span> <span class='hs-conid'>String</span>
<a name="line-70"></a> <span class='hs-keyword'>deriving</span> <span class='hs-conid'>Show</span>
<a name="line-71"></a>
<a name="line-72"></a><a name="hunitFailureTc"></a><span class='hs-definition'>hunitFailureTc</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>TyCon</span>
<a name="line-73"></a><span class='hs-definition'>hunitFailureTc</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mkTyCon</span> <span class='hs-str'>"HUnitFailure"</span>
<a name="line-74"></a><span class='hs-comment'>{-# NOINLINE hunitFailureTc #-}</span>
<a name="line-75"></a>
<a name="line-76"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Typeable</span> <span class='hs-conid'>HUnitFailure</span> <span class='hs-keyword'>where</span>
<a name="line-77"></a> <span class='hs-varid'>typeOf</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mkTyConApp</span> <span class='hs-varid'>hunitFailureTc</span> <span class='hs-conid'>[]</span>
<a name="line-78"></a><span class='hs-cpp'>#ifdef BASE4</span>
<a name="line-79"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Exception</span> <span class='hs-conid'>HUnitFailure</span>
<a name="line-80"></a>
<a name="line-81"></a><span class='hs-definition'>assertFailure</span> <span class='hs-varid'>msg</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>E</span><span class='hs-varop'>.</span><span class='hs-varid'>throw</span> <span class='hs-layout'>(</span><span class='hs-conid'>HUnitFailure</span> <span class='hs-varid'>msg</span><span class='hs-layout'>)</span>
<a name="line-82"></a>
<a name="line-83"></a><span class='hs-definition'>performTestCase</span> <span class='hs-varid'>action</span> <span class='hs-keyglyph'>=</span>
<a name="line-84"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>action</span>
<a name="line-85"></a> <span class='hs-varid'>return</span> <span class='hs-conid'>Nothing</span>
<a name="line-86"></a> <span class='hs-varop'>`</span><span class='hs-conid'>E</span><span class='hs-varop'>.</span><span class='hs-varid'>catches</span><span class='hs-varop'>`</span>
<a name="line-87"></a> <span class='hs-keyglyph'>[</span><span class='hs-conid'>E</span><span class='hs-varop'>.</span><span class='hs-conid'>Handler</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-layout'>(</span><span class='hs-conid'>HUnitFailure</span> <span class='hs-varid'>msg</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-conid'>True</span><span class='hs-layout'>,</span> <span class='hs-varid'>msg</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-88"></a> <span class='hs-conid'>E</span><span class='hs-varop'>.</span><span class='hs-conid'>Handler</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>e</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-conid'>False</span><span class='hs-layout'>,</span> <span class='hs-varid'>show</span> <span class='hs-layout'>(</span><span class='hs-varid'>e</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>E</span><span class='hs-varop'>.</span><span class='hs-conid'>SomeException</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-89"></a><span class='hs-cpp'>#else</span>
<a name="line-90"></a><span class='hs-definition'>assertFailure</span> <span class='hs-varid'>msg</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>E</span><span class='hs-varop'>.</span><span class='hs-varid'>throwDyn</span> <span class='hs-layout'>(</span><span class='hs-conid'>HUnitFailure</span> <span class='hs-varid'>msg</span><span class='hs-layout'>)</span>
<a name="line-91"></a>
<a name="line-92"></a><span class='hs-definition'>performTestCase</span> <span class='hs-varid'>action</span> <span class='hs-keyglyph'>=</span>
<a name="line-93"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'><-</span> <span class='hs-conid'>E</span><span class='hs-varop'>.</span><span class='hs-varid'>try</span> <span class='hs-varid'>action</span>
<a name="line-94"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>r</span> <span class='hs-keyword'>of</span>
<a name="line-95"></a> <span class='hs-conid'>Right</span> <span class='hs-conid'>()</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-conid'>Nothing</span>
<a name="line-96"></a> <span class='hs-conid'>Left</span> <span class='hs-varid'>e</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>E</span><span class='hs-varop'>.</span><span class='hs-conid'>DynException</span> <span class='hs-varid'>dyn</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span>
<a name="line-97"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>fromDynamic</span> <span class='hs-varid'>dyn</span> <span class='hs-keyword'>of</span>
<a name="line-98"></a> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-conid'>HUnitFailure</span> <span class='hs-varid'>msg</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-conid'>True</span><span class='hs-layout'>,</span> <span class='hs-varid'>msg</span><span class='hs-layout'>)</span>
<a name="line-99"></a> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-conid'>False</span><span class='hs-layout'>,</span> <span class='hs-varid'>show</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span>
<a name="line-100"></a> <span class='hs-conid'>Left</span> <span class='hs-varid'>e</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-conid'>False</span><span class='hs-layout'>,</span> <span class='hs-varid'>show</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span>
<a name="line-101"></a><span class='hs-cpp'>#endif</span>
<a name="line-102"></a><span class='hs-cpp'>#else</span>
<a name="line-103"></a><a name="hunitPrefix"></a><span class='hs-definition'>hunitPrefix</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"HUnit:"</span>
<a name="line-104"></a>
<a name="line-105"></a><a name="nhc98Prefix"></a><span class='hs-definition'>nhc98Prefix</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"I/O error (user-defined), call to function `userError':\n "</span>
<a name="line-106"></a>
<a name="line-107"></a><span class='hs-definition'>assertFailure</span> <span class='hs-varid'>msg</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>ioError</span> <span class='hs-layout'>(</span><span class='hs-varid'>userError</span> <span class='hs-layout'>(</span><span class='hs-varid'>hunitPrefix</span> <span class='hs-varop'>++</span> <span class='hs-varid'>msg</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-108"></a>
<a name="line-109"></a><span class='hs-definition'>performTestCase</span> <span class='hs-varid'>action</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>try</span> <span class='hs-varid'>action</span>
<a name="line-110"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>r</span> <span class='hs-keyword'>of</span> <span class='hs-conid'>Right</span> <span class='hs-conid'>()</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-conid'>Nothing</span>
<a name="line-111"></a> <span class='hs-conid'>Left</span> <span class='hs-varid'>e</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-varid'>decode</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-112"></a> <span class='hs-keyword'>where</span>
<a name="line-113"></a> <span class='hs-varid'>decode</span> <span class='hs-varid'>e</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>let</span> <span class='hs-varid'>s0</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>ioeGetErrorString</span> <span class='hs-varid'>e</span>
<a name="line-114"></a> <span class='hs-layout'>(</span><span class='hs-keyword'>_</span><span class='hs-layout'>,</span> <span class='hs-varid'>s1</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>dropPrefix</span> <span class='hs-varid'>nhc98Prefix</span> <span class='hs-varid'>s0</span>
<a name="line-115"></a> <span class='hs-keyword'>in</span> <span class='hs-varid'>dropPrefix</span> <span class='hs-varid'>hunitPrefix</span> <span class='hs-varid'>s1</span>
<a name="line-116"></a> <span class='hs-varid'>dropPrefix</span> <span class='hs-varid'>pref</span> <span class='hs-varid'>str</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>pref</span> <span class='hs-varop'>`isPrefixOf`</span> <span class='hs-varid'>str</span>
<a name="line-117"></a> <span class='hs-keyword'>then</span> <span class='hs-layout'>(</span><span class='hs-conid'>True</span><span class='hs-layout'>,</span> <span class='hs-varid'>drop</span> <span class='hs-layout'>(</span><span class='hs-varid'>length</span> <span class='hs-varid'>pref</span><span class='hs-layout'>)</span> <span class='hs-varid'>str</span><span class='hs-layout'>)</span>
<a name="line-118"></a> <span class='hs-keyword'>else</span> <span class='hs-layout'>(</span><span class='hs-conid'>False</span><span class='hs-layout'>,</span> <span class='hs-varid'>str</span><span class='hs-layout'>)</span>
<a name="line-119"></a><span class='hs-cpp'>#endif</span>
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