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<title>Text/EditDistance/EditCosts.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>{-# OPTIONS_GHC -funbox-strict-fields #-}</span>
<a name="line-2"></a>
<a name="line-3"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Text</span><span class='hs-varop'>.</span><span class='hs-conid'>EditDistance</span><span class='hs-varop'>.</span><span class='hs-conid'>EditCosts</span> <span class='hs-layout'>(</span>
<a name="line-4"></a> <span class='hs-conid'>Costs</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-5"></a> <span class='hs-conid'>EditCosts</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>deletionCost</span><span class='hs-layout'>,</span> <span class='hs-varid'>insertionCost</span><span class='hs-layout'>,</span> <span class='hs-varid'>substitutionCost</span><span class='hs-layout'>,</span> <span class='hs-varid'>transpositionCost</span><span class='hs-layout'>,</span>
<a name="line-6"></a> <span class='hs-varid'>defaultEditCosts</span><span class='hs-layout'>,</span> <span class='hs-varid'>isDefaultEditCosts</span>
<a name="line-7"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-8"></a>
<a name="line-9"></a><a name="Costs"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>Costs</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ConstantCost</span> <span class='hs-varop'>!</span><span class='hs-conid'>Int</span>
<a name="line-10"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>VariableCost</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span><span class='hs-layout'>)</span>
<a name="line-11"></a>
<a name="line-12"></a><a name="cost"></a><span class='hs-comment'>{-# INLINE cost #-}</span>
<a name="line-13"></a><span class='hs-definition'>cost</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Costs</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'>Int</span>
<a name="line-14"></a><span class='hs-definition'>cost</span> <span class='hs-layout'>(</span><span class='hs-conid'>ConstantCost</span> <span class='hs-varid'>i</span><span class='hs-layout'>)</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>i</span>
<a name="line-15"></a><span class='hs-definition'>cost</span> <span class='hs-layout'>(</span><span class='hs-conid'>VariableCost</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>f</span> <span class='hs-varid'>x</span>
<a name="line-16"></a>
<a name="line-17"></a><a name="EditCosts"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>EditCosts</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>EditCosts</span> <span class='hs-layout'>{</span>
<a name="line-18"></a> <span class='hs-varid'>deletionCosts</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Costs</span> <span class='hs-conid'>Char</span><span class='hs-layout'>,</span> <span class='hs-comment'>-- ^ Cost of deleting the specified character from the left string</span>
<a name="line-19"></a> <span class='hs-varid'>insertionCosts</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Costs</span> <span class='hs-conid'>Char</span><span class='hs-layout'>,</span> <span class='hs-comment'>-- ^ Cost of inserting the specified characters into the right string</span>
<a name="line-20"></a> <span class='hs-varid'>substitutionCosts</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Costs</span> <span class='hs-layout'>(</span><span class='hs-conid'>Char</span><span class='hs-layout'>,</span> <span class='hs-conid'>Char</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-comment'>-- ^ Cost of substituting a character from the left string with one from the right string -- with arguments in that order.</span>
<a name="line-21"></a> <span class='hs-varid'>transpositionCosts</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Costs</span> <span class='hs-layout'>(</span><span class='hs-conid'>Char</span><span class='hs-layout'>,</span> <span class='hs-conid'>Char</span><span class='hs-layout'>)</span> <span class='hs-comment'>-- ^ Cost of moving one character backwards and the other forwards -- with arguments in that order.</span>
<a name="line-22"></a> <span class='hs-layout'>}</span>
<a name="line-23"></a>
<a name="line-24"></a><a name="deletionCost"></a><span class='hs-comment'>{-# INLINE deletionCost #-}</span>
<a name="line-25"></a><span class='hs-definition'>deletionCost</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>EditCosts</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span>
<a name="line-26"></a><span class='hs-definition'>deletionCost</span> <span class='hs-varid'>ec</span> <span class='hs-varid'>deleted</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>cost</span> <span class='hs-layout'>(</span><span class='hs-varid'>deletionCosts</span> <span class='hs-varid'>ec</span><span class='hs-layout'>)</span> <span class='hs-varid'>deleted</span>
<a name="line-27"></a>
<a name="line-28"></a><a name="insertionCost"></a><span class='hs-comment'>{-# INLINE insertionCost #-}</span>
<a name="line-29"></a><span class='hs-definition'>insertionCost</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>EditCosts</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span>
<a name="line-30"></a><span class='hs-definition'>insertionCost</span> <span class='hs-varid'>ec</span> <span class='hs-varid'>inserted</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>cost</span> <span class='hs-layout'>(</span><span class='hs-varid'>insertionCosts</span> <span class='hs-varid'>ec</span><span class='hs-layout'>)</span> <span class='hs-varid'>inserted</span>
<a name="line-31"></a>
<a name="line-32"></a><a name="substitutionCost"></a><span class='hs-comment'>{-# INLINE substitutionCost #-}</span>
<a name="line-33"></a><span class='hs-definition'>substitutionCost</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>EditCosts</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span>
<a name="line-34"></a><span class='hs-definition'>substitutionCost</span> <span class='hs-varid'>ec</span> <span class='hs-varid'>old</span> <span class='hs-varid'>new</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>cost</span> <span class='hs-layout'>(</span><span class='hs-varid'>substitutionCosts</span> <span class='hs-varid'>ec</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>old</span><span class='hs-layout'>,</span> <span class='hs-varid'>new</span><span class='hs-layout'>)</span>
<a name="line-35"></a>
<a name="line-36"></a><a name="transpositionCost"></a><span class='hs-comment'>{-# INLINE transpositionCost #-}</span>
<a name="line-37"></a><span class='hs-definition'>transpositionCost</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>EditCosts</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span>
<a name="line-38"></a><span class='hs-definition'>transpositionCost</span> <span class='hs-varid'>ec</span> <span class='hs-varid'>backwards</span> <span class='hs-varid'>forwards</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>cost</span> <span class='hs-layout'>(</span><span class='hs-varid'>transpositionCosts</span> <span class='hs-varid'>ec</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>backwards</span><span class='hs-layout'>,</span> <span class='hs-varid'>forwards</span><span class='hs-layout'>)</span>
<a name="line-39"></a>
<a name="line-40"></a><a name="defaultEditCosts"></a><span class='hs-definition'>defaultEditCosts</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>EditCosts</span>
<a name="line-41"></a><span class='hs-definition'>defaultEditCosts</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>EditCosts</span> <span class='hs-layout'>{</span>
<a name="line-42"></a> <span class='hs-varid'>deletionCosts</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ConstantCost</span> <span class='hs-num'>1</span><span class='hs-layout'>,</span>
<a name="line-43"></a> <span class='hs-varid'>insertionCosts</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ConstantCost</span> <span class='hs-num'>1</span><span class='hs-layout'>,</span>
<a name="line-44"></a> <span class='hs-varid'>substitutionCosts</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ConstantCost</span> <span class='hs-num'>1</span><span class='hs-layout'>,</span>
<a name="line-45"></a> <span class='hs-varid'>transpositionCosts</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ConstantCost</span> <span class='hs-num'>1</span>
<a name="line-46"></a><span class='hs-layout'>}</span>
<a name="line-47"></a>
<a name="line-48"></a><a name="isDefaultEditCosts"></a><span class='hs-definition'>isDefaultEditCosts</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>EditCosts</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span>
<a name="line-49"></a><span class='hs-definition'>isDefaultEditCosts</span> <span class='hs-layout'>(</span><span class='hs-conid'>EditCosts</span> <span class='hs-layout'>{</span> <span class='hs-varid'>deletionCosts</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ConstantCost</span> <span class='hs-num'>1</span><span class='hs-layout'>,</span> <span class='hs-varid'>insertionCosts</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ConstantCost</span> <span class='hs-num'>1</span><span class='hs-layout'>,</span> <span class='hs-varid'>substitutionCosts</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ConstantCost</span> <span class='hs-num'>1</span><span class='hs-layout'>,</span> <span class='hs-varid'>transpositionCosts</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ConstantCost</span> <span class='hs-num'>1</span> <span class='hs-layout'>}</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>True</span>
<a name="line-50"></a><span class='hs-definition'>isDefaultEditCosts</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>False</span>
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