<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html> <head> <!-- Generated by HsColour, http://www.cs.york.ac.uk/fp/darcs/hscolour/ --> <title>cmm/CmmTx.hs</title> <link type='text/css' rel='stylesheet' href='hscolour.css' /> </head> <body> <pre><a name="line-1"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>CmmTx</span> <span class='hs-keyword'>where</span> <a name="line-2"></a> <a name="line-3"></a><a name="ChangeFlag"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>ChangeFlag</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>NoChange</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>SomeChange</span> <a name="line-4"></a> <a name="line-5"></a><a name="Tx"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>Tx</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>TxRes</span> <span class='hs-varid'>a</span> <a name="line-6"></a><a name="TxRes"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>TxRes</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>TxRes</span> <span class='hs-conid'>ChangeFlag</span> <span class='hs-varid'>a</span> <a name="line-7"></a> <a name="line-8"></a><a name="seqTx"></a><span class='hs-definition'>seqTx</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Tx</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Tx</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Tx</span> <span class='hs-varid'>a</span> <a name="line-9"></a><a name="iterateTx"></a><span class='hs-definition'>iterateTx</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Tx</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Tx</span> <span class='hs-varid'>a</span> <a name="line-10"></a><a name="runTx"></a><span class='hs-definition'>runTx</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Tx</span> <span class='hs-varid'>a</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-11"></a> <a name="line-12"></a><a name="noTx"></a><span class='hs-definition'>noTx</span><span class='hs-layout'>,</span> <span class='hs-varid'>aTx</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>TxRes</span> <span class='hs-varid'>a</span> <a name="line-13"></a><span class='hs-definition'>noTx</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>TxRes</span> <span class='hs-conid'>NoChange</span> <span class='hs-varid'>x</span> <a name="line-14"></a><a name="aTx"></a><span class='hs-definition'>aTx</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>TxRes</span> <span class='hs-conid'>SomeChange</span> <span class='hs-varid'>x</span> <a name="line-15"></a> <a name="line-16"></a><a name="replaceTx"></a><span class='hs-definition'>replaceTx</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>TxRes</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>TxRes</span> <span class='hs-varid'>a</span> <a name="line-17"></a><span class='hs-definition'>replaceTx</span> <span class='hs-varid'>a</span> <span class='hs-layout'>(</span><span class='hs-conid'>TxRes</span> <span class='hs-varid'>change</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>TxRes</span> <span class='hs-varid'>change</span> <span class='hs-varid'>a</span> <a name="line-18"></a> <a name="line-19"></a><a name="txVal"></a><span class='hs-definition'>txVal</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>TxRes</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span> <a name="line-20"></a><span class='hs-definition'>txVal</span> <span class='hs-layout'>(</span><span class='hs-conid'>TxRes</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>a</span> <a name="line-21"></a> <a name="line-22"></a><a name="txHasChanged"></a><span class='hs-definition'>txHasChanged</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>TxRes</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span> <a name="line-23"></a><span class='hs-definition'>txHasChanged</span> <span class='hs-layout'>(</span><span class='hs-conid'>TxRes</span> <span class='hs-conid'>NoChange</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>False</span> <a name="line-24"></a><span class='hs-definition'>txHasChanged</span> <span class='hs-layout'>(</span><span class='hs-conid'>TxRes</span> <span class='hs-conid'>SomeChange</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>True</span> <a name="line-25"></a> <a name="line-26"></a><a name="plusTx"></a><span class='hs-definition'>plusTx</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'>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-conid'>TxRes</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>TxRes</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>TxRes</span> <span class='hs-varid'>c</span> <a name="line-27"></a><span class='hs-definition'>plusTx</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-conid'>TxRes</span> <span class='hs-varid'>c1</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>TxRes</span> <span class='hs-varid'>c2</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>TxRes</span> <span class='hs-layout'>(</span><span class='hs-varid'>c1</span> <span class='hs-varop'>`orChange`</span> <span class='hs-varid'>c2</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <a name="line-28"></a> <a name="line-29"></a><a name="mapTx"></a><span class='hs-definition'>mapTx</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Tx</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Tx</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span> <a name="line-30"></a><span class='hs-definition'>mapTx</span> <span class='hs-keyword'>_</span> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>noTx</span> <span class='hs-conid'>[]</span> <a name="line-31"></a><span class='hs-definition'>mapTx</span> <span class='hs-varid'>f</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> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>plusTx</span> <span class='hs-layout'>(</span><span class='hs-conop'>:</span><span class='hs-layout'>)</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-layout'>(</span><span class='hs-varid'>mapTx</span> <span class='hs-varid'>f</span> <span class='hs-varid'>xs</span><span class='hs-layout'>)</span> <a name="line-32"></a> <a name="line-33"></a><span class='hs-definition'>runTx</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>txVal</span> <span class='hs-varop'>.</span> <span class='hs-varid'>f</span> <a name="line-34"></a> <a name="line-35"></a><span class='hs-definition'>seqTx</span> <span class='hs-varid'>f1</span> <span class='hs-varid'>f2</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <a name="line-36"></a> <span class='hs-keyword'>let</span> <span class='hs-conid'>TxRes</span> <span class='hs-varid'>c1</span> <span class='hs-varid'>a1</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>f1</span> <span class='hs-varid'>a</span> <a name="line-37"></a> <span class='hs-conid'>TxRes</span> <span class='hs-varid'>c2</span> <span class='hs-varid'>a2</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>f2</span> <span class='hs-varid'>a1</span> <a name="line-38"></a> <span class='hs-keyword'>in</span> <span class='hs-conid'>TxRes</span> <span class='hs-layout'>(</span><span class='hs-varid'>c1</span> <span class='hs-varop'>`orChange`</span> <span class='hs-varid'>c2</span><span class='hs-layout'>)</span> <span class='hs-varid'>a2</span> <a name="line-39"></a> <a name="line-40"></a><span class='hs-definition'>iterateTx</span> <span class='hs-varid'>f</span> <span class='hs-varid'>a</span> <a name="line-41"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>f</span> <span class='hs-varid'>a</span> <span class='hs-keyword'>of</span> <a name="line-42"></a> <span class='hs-conid'>TxRes</span> <span class='hs-conid'>NoChange</span> <span class='hs-varid'>a'</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>TxRes</span> <span class='hs-conid'>NoChange</span> <span class='hs-varid'>a'</span> <a name="line-43"></a> <span class='hs-conid'>TxRes</span> <span class='hs-conid'>SomeChange</span> <span class='hs-varid'>a'</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>let</span> <span class='hs-conid'>TxRes</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>a''</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>iterateTx</span> <span class='hs-varid'>f</span> <span class='hs-varid'>a'</span> <a name="line-44"></a> <span class='hs-keyword'>in</span> <span class='hs-conid'>TxRes</span> <span class='hs-conid'>SomeChange</span> <span class='hs-varid'>a''</span> <a name="line-45"></a> <a name="line-46"></a><a name="orChange"></a><span class='hs-definition'>orChange</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>ChangeFlag</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ChangeFlag</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ChangeFlag</span> <a name="line-47"></a><span class='hs-definition'>orChange</span> <span class='hs-conid'>NoChange</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>c</span> <a name="line-48"></a><span class='hs-definition'>orChange</span> <span class='hs-conid'>SomeChange</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>SomeChange</span> <a name="line-49"></a> <a name="line-50"></a> <a name="line-51"></a> <a name="line-52"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Functor</span> <span class='hs-conid'>TxRes</span> <span class='hs-keyword'>where</span> <a name="line-53"></a> <span class='hs-varid'>fmap</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-conid'>TxRes</span> <span class='hs-varid'>ch</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>TxRes</span> <span class='hs-varid'>ch</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <a name="line-54"></a> <a name="line-55"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Monad</span> <span class='hs-conid'>TxRes</span> <span class='hs-keyword'>where</span> <a name="line-56"></a> <span class='hs-varid'>return</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>TxRes</span> <span class='hs-conid'>NoChange</span> <a name="line-57"></a> <span class='hs-layout'>(</span><span class='hs-conid'>TxRes</span> <span class='hs-conid'>NoChange</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-varop'>>>=</span> <span class='hs-varid'>k</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>k</span> <span class='hs-varid'>a</span> <a name="line-58"></a> <span class='hs-layout'>(</span><span class='hs-conid'>TxRes</span> <span class='hs-conid'>SomeChange</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-varop'>>>=</span> <span class='hs-varid'>k</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>let</span> <span class='hs-layout'>(</span><span class='hs-conid'>TxRes</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>a'</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>k</span> <span class='hs-varid'>a</span> <span class='hs-keyword'>in</span> <span class='hs-conid'>TxRes</span> <span class='hs-conid'>SomeChange</span> <span class='hs-varid'>a'</span> </pre></body> </html>
