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<title>src/HSE/Evaluate.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE ViewPatterns #-}</span>
<a name="line-2"></a>
<a name="line-3"></a><span class='hs-comment'>-- Evaluate a HSE Exp as much as possible</span>
<a name="line-4"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>HSE</span><span class='hs-varop'>.</span><span class='hs-conid'>Evaluate</span><span class='hs-layout'>(</span><span class='hs-varid'>evaluate</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
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<a name="line-6"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>HSE</span><span class='hs-varop'>.</span><span class='hs-conid'>Match</span>
<a name="line-7"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>HSE</span><span class='hs-varop'>.</span><span class='hs-conid'>Util</span>
<a name="line-8"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>HSE</span><span class='hs-varop'>.</span><span class='hs-conid'>Type</span>
<a name="line-9"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>HSE</span><span class='hs-varop'>.</span><span class='hs-conid'>Bracket</span>
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<a name="line-12"></a><a name="evaluate"></a><span class='hs-definition'>evaluate</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Exp_</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Exp_</span>
<a name="line-13"></a><span class='hs-definition'>evaluate</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fromParen</span> <span class='hs-varop'>.</span> <span class='hs-varid'>transform</span> <span class='hs-varid'>evaluate1</span>
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<a name="line-16"></a><a name="evaluate1"></a><span class='hs-definition'>evaluate1</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Exp_</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Exp_</span>
<a name="line-17"></a><span class='hs-definition'>evaluate1</span> <span class='hs-layout'>(</span><span class='hs-conid'>App</span> <span class='hs-varid'>s</span> <span class='hs-varid'>len</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-varid'>xs</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>len</span> <span class='hs-varop'>~=</span> <span class='hs-str'>"length"</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Lit</span> <span class='hs-varid'>s</span> <span class='hs-varop'>$</span> <span class='hs-conid'>Int</span> <span class='hs-varid'>s</span> <span class='hs-varid'>n</span> <span class='hs-layout'>(</span><span class='hs-varid'>show</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span>
<a name="line-18"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varop'>$</span> <span class='hs-varid'>length</span> <span class='hs-varid'>xs</span>
<a name="line-19"></a><span class='hs-definition'>evaluate1</span> <span class='hs-layout'>(</span><span class='hs-conid'>App</span> <span class='hs-varid'>s</span> <span class='hs-varid'>len</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-layout'>)</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>len</span> <span class='hs-varop'>~=</span> <span class='hs-str'>"length"</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Lit</span> <span class='hs-varid'>s</span> <span class='hs-varop'>$</span> <span class='hs-conid'>Int</span> <span class='hs-varid'>s</span> <span class='hs-varid'>n</span> <span class='hs-layout'>(</span><span class='hs-varid'>show</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span>
<a name="line-20"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varop'>$</span> <span class='hs-varid'>length</span> <span class='hs-varid'>xs</span>
<a name="line-21"></a><span class='hs-definition'>evaluate1</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-layout'>(</span><span class='hs-conid'>Lit</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Lit</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>y</span><span class='hs-layout'>)</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-keyglyph'>=</span> <span class='hs-varid'>toNamed</span> <span class='hs-varop'>$</span> <span class='hs-varid'>show</span> <span class='hs-varop'>$</span> <span class='hs-varid'>x</span> <span class='hs-varop'>=~=</span> <span class='hs-varid'>y</span>
<a name="line-22"></a><span class='hs-definition'>evaluate1</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>
<a name="line-23"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>op</span> <span class='hs-varop'>~=</span> <span class='hs-str'>"&&"</span> <span class='hs-varop'>&&</span> <span class='hs-varid'>x</span> <span class='hs-varop'>~=</span> <span class='hs-str'>"True"</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>y</span>
<a name="line-24"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>op</span> <span class='hs-varop'>~=</span> <span class='hs-str'>"&&"</span> <span class='hs-varop'>&&</span> <span class='hs-varid'>x</span> <span class='hs-varop'>~=</span> <span class='hs-str'>"False"</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>x</span>
<a name="line-25"></a><span class='hs-definition'>evaluate1</span> <span class='hs-layout'>(</span><span class='hs-conid'>Paren</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>isAtom</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>x</span>
<a name="line-26"></a><span class='hs-definition'>evaluate1</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>x</span>
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