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<title>Language/Preprocessor/Cpphs/SymTab.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-2"></a><span class='hs-comment'>-- |</span>
<a name="line-3"></a><span class='hs-comment'>-- Module : SymTab</span>
<a name="line-4"></a><span class='hs-comment'>-- Copyright : 2000-2004 Malcolm Wallace</span>
<a name="line-5"></a><span class='hs-comment'>-- Licence : LGPL</span>
<a name="line-6"></a><span class='hs-comment'>-- </span>
<a name="line-7"></a><span class='hs-comment'>-- Maintainer : Malcolm Wallace <Malcolm.Wallace@cs.york.ac.uk></span>
<a name="line-8"></a><span class='hs-comment'>-- Stability : Stable</span>
<a name="line-9"></a><span class='hs-comment'>-- Portability : All</span>
<a name="line-10"></a><span class='hs-comment'>--</span>
<a name="line-11"></a><span class='hs-comment'>-- Symbol Table, based on index trees using a hash on the key.</span>
<a name="line-12"></a><span class='hs-comment'>-- Keys are always Strings. Stored values can be any type.</span>
<a name="line-13"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-14"></a>
<a name="line-15"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Language</span><span class='hs-varop'>.</span><span class='hs-conid'>Preprocessor</span><span class='hs-varop'>.</span><span class='hs-conid'>Cpphs</span><span class='hs-varop'>.</span><span class='hs-conid'>SymTab</span>
<a name="line-16"></a> <span class='hs-layout'>(</span> <span class='hs-conid'>SymTab</span>
<a name="line-17"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>emptyST</span>
<a name="line-18"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>insertST</span>
<a name="line-19"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>deleteST</span>
<a name="line-20"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>lookupST</span>
<a name="line-21"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>definedST</span>
<a name="line-22"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>IndTree</span>
<a name="line-23"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-24"></a>
<a name="line-25"></a><a name="SymTab"></a><span class='hs-comment'>-- | Symbol Table. Stored values are polymorphic, but the keys are</span>
<a name="line-26"></a><a name="SymTab"></a><span class='hs-comment'>-- always strings.</span>
<a name="line-27"></a><a name="SymTab"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>SymTab</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>IndTree</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>String</span><span class='hs-layout'>,</span><span class='hs-varid'>v</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-28"></a>
<a name="line-29"></a><a name="emptyST"></a><span class='hs-definition'>emptyST</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>SymTab</span> <span class='hs-varid'>v</span>
<a name="line-30"></a><a name="insertST"></a><span class='hs-definition'>insertST</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>String</span><span class='hs-layout'>,</span><span class='hs-varid'>v</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>SymTab</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>SymTab</span> <span class='hs-varid'>v</span>
<a name="line-31"></a><a name="deleteST"></a><span class='hs-definition'>deleteST</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>SymTab</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>SymTab</span> <span class='hs-varid'>v</span>
<a name="line-32"></a><a name="lookupST"></a><span class='hs-definition'>lookupST</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>SymTab</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-varid'>v</span>
<a name="line-33"></a><a name="definedST"></a><span class='hs-definition'>definedST</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>SymTab</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span>
<a name="line-34"></a>
<a name="line-35"></a><span class='hs-definition'>emptyST</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>itgen</span> <span class='hs-varid'>maxHash</span> <span class='hs-conid'>[]</span>
<a name="line-36"></a><span class='hs-definition'>insertST</span> <span class='hs-layout'>(</span><span class='hs-varid'>s</span><span class='hs-layout'>,</span><span class='hs-varid'>v</span><span class='hs-layout'>)</span> <span class='hs-varid'>ss</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>itiap</span> <span class='hs-layout'>(</span><span class='hs-varid'>hash</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varid'>s</span><span class='hs-layout'>,</span><span class='hs-varid'>v</span><span class='hs-layout'>)</span><span class='hs-conop'>:</span><span class='hs-layout'>)</span> <span class='hs-varid'>ss</span> <span class='hs-varid'>id</span>
<a name="line-37"></a><span class='hs-definition'>deleteST</span> <span class='hs-varid'>s</span> <span class='hs-varid'>ss</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>itiap</span> <span class='hs-layout'>(</span><span class='hs-varid'>hash</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>filter</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varop'>/=</span><span class='hs-varid'>s</span><span class='hs-layout'>)</span><span class='hs-varop'>.</span><span class='hs-varid'>fst</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varid'>ss</span> <span class='hs-varid'>id</span>
<a name="line-38"></a><span class='hs-definition'>lookupST</span> <span class='hs-varid'>s</span> <span class='hs-varid'>ss</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>let</span> <span class='hs-varid'>vs</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>filter</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varop'>==</span><span class='hs-varid'>s</span><span class='hs-layout'>)</span><span class='hs-varop'>.</span><span class='hs-varid'>fst</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varid'>itind</span> <span class='hs-layout'>(</span><span class='hs-varid'>hash</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varid'>ss</span><span class='hs-layout'>)</span>
<a name="line-39"></a> <span class='hs-keyword'>in</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>null</span> <span class='hs-varid'>vs</span> <span class='hs-keyword'>then</span> <span class='hs-conid'>Nothing</span>
<a name="line-40"></a> <span class='hs-keyword'>else</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varop'>.</span> <span class='hs-varid'>snd</span> <span class='hs-varop'>.</span> <span class='hs-varid'>head</span><span class='hs-layout'>)</span> <span class='hs-varid'>vs</span>
<a name="line-41"></a><span class='hs-definition'>definedST</span> <span class='hs-varid'>s</span> <span class='hs-varid'>ss</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>let</span> <span class='hs-varid'>vs</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>filter</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varop'>==</span><span class='hs-varid'>s</span><span class='hs-layout'>)</span><span class='hs-varop'>.</span><span class='hs-varid'>fst</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varid'>itind</span> <span class='hs-layout'>(</span><span class='hs-varid'>hash</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varid'>ss</span><span class='hs-layout'>)</span>
<a name="line-42"></a> <span class='hs-keyword'>in</span> <span class='hs-layout'>(</span><span class='hs-varid'>not</span> <span class='hs-varop'>.</span> <span class='hs-varid'>null</span><span class='hs-layout'>)</span> <span class='hs-varid'>vs</span>
<a name="line-43"></a>
<a name="line-44"></a>
<a name="line-45"></a><span class='hs-comment'>----</span>
<a name="line-46"></a><span class='hs-comment'>-- | Index Trees (storing indexes at nodes).</span>
<a name="line-47"></a>
<a name="line-48"></a><a name="IndTree"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>IndTree</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Leaf</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Fork</span> <span class='hs-conid'>Int</span> <span class='hs-layout'>(</span><span class='hs-conid'>IndTree</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>IndTree</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span>
<a name="line-49"></a> <span class='hs-keyword'>deriving</span> <span class='hs-conid'>Show</span>
<a name="line-50"></a>
<a name="line-51"></a><a name="itgen"></a><span class='hs-definition'>itgen</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IndTree</span> <span class='hs-varid'>a</span>
<a name="line-52"></a><span class='hs-definition'>itgen</span> <span class='hs-num'>1</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Leaf</span> <span class='hs-varid'>x</span>
<a name="line-53"></a><span class='hs-definition'>itgen</span> <span class='hs-varid'>n</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span>
<a name="line-54"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>n'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>n</span> <span class='hs-varop'>`div`</span> <span class='hs-num'>2</span>
<a name="line-55"></a> <span class='hs-keyword'>in</span> <span class='hs-conid'>Fork</span> <span class='hs-varid'>n'</span> <span class='hs-layout'>(</span><span class='hs-varid'>itgen</span> <span class='hs-varid'>n'</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>itgen</span> <span class='hs-layout'>(</span><span class='hs-varid'>n</span><span class='hs-comment'>-</span><span class='hs-varid'>n'</span><span class='hs-layout'>)</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span>
<a name="line-56"></a>
<a name="line-57"></a><a name="itiap"></a><span class='hs-definition'>itiap</span> <span class='hs-keyglyph'>::</span> <span class='hs-comment'>--Eval a =></span>
<a name="line-58"></a> <span class='hs-conid'>Int</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'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IndTree</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>IndTree</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>b</span>
<a name="line-59"></a><span class='hs-definition'>itiap</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-conid'>Leaf</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-varid'>k</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>let</span> <span class='hs-varid'>fx</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>f</span> <span class='hs-varid'>x</span> <span class='hs-keyword'>in</span> <span class='hs-comment'>{-seq fx-}</span> <span class='hs-layout'>(</span><span class='hs-varid'>k</span> <span class='hs-layout'>(</span><span class='hs-conid'>Leaf</span> <span class='hs-varid'>fx</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-60"></a><span class='hs-definition'>itiap</span> <span class='hs-varid'>i</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-conid'>Fork</span> <span class='hs-varid'>n</span> <span class='hs-varid'>lt</span> <span class='hs-varid'>rt</span><span class='hs-layout'>)</span> <span class='hs-varid'>k</span> <span class='hs-keyglyph'>=</span>
<a name="line-61"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>i</span><span class='hs-varop'><</span><span class='hs-varid'>n</span> <span class='hs-keyword'>then</span>
<a name="line-62"></a> <span class='hs-varid'>itiap</span> <span class='hs-varid'>i</span> <span class='hs-varid'>f</span> <span class='hs-varid'>lt</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>lt'</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>k</span> <span class='hs-layout'>(</span><span class='hs-conid'>Fork</span> <span class='hs-varid'>n</span> <span class='hs-varid'>lt'</span> <span class='hs-varid'>rt</span><span class='hs-layout'>)</span>
<a name="line-63"></a> <span class='hs-keyword'>else</span> <span class='hs-varid'>itiap</span> <span class='hs-layout'>(</span><span class='hs-varid'>i</span><span class='hs-comment'>-</span><span class='hs-varid'>n</span><span class='hs-layout'>)</span> <span class='hs-varid'>f</span> <span class='hs-varid'>rt</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>rt'</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>k</span> <span class='hs-layout'>(</span><span class='hs-conid'>Fork</span> <span class='hs-varid'>n</span> <span class='hs-varid'>lt</span> <span class='hs-varid'>rt'</span><span class='hs-layout'>)</span>
<a name="line-64"></a>
<a name="line-65"></a><a name="itind"></a><span class='hs-definition'>itind</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IndTree</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span>
<a name="line-66"></a><span class='hs-definition'>itind</span> <span class='hs-keyword'>_</span> <span class='hs-layout'>(</span><span class='hs-conid'>Leaf</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>x</span>
<a name="line-67"></a><span class='hs-definition'>itind</span> <span class='hs-varid'>i</span> <span class='hs-layout'>(</span><span class='hs-conid'>Fork</span> <span class='hs-varid'>n</span> <span class='hs-varid'>lt</span> <span class='hs-varid'>rt</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>i</span><span class='hs-varop'><</span><span class='hs-varid'>n</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>itind</span> <span class='hs-varid'>i</span> <span class='hs-varid'>lt</span> <span class='hs-keyword'>else</span> <span class='hs-varid'>itind</span> <span class='hs-layout'>(</span><span class='hs-varid'>i</span><span class='hs-comment'>-</span><span class='hs-varid'>n</span><span class='hs-layout'>)</span> <span class='hs-varid'>rt</span>
<a name="line-68"></a>
<a name="line-69"></a>
<a name="line-70"></a><span class='hs-comment'>----</span>
<a name="line-71"></a><span class='hs-comment'>-- Hash values</span>
<a name="line-72"></a>
<a name="line-73"></a><a name="maxHash"></a><span class='hs-definition'>maxHash</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-comment'>-- should be prime</span>
<a name="line-74"></a><span class='hs-definition'>maxHash</span> <span class='hs-keyglyph'>=</span> <span class='hs-num'>101</span>
<a name="line-75"></a>
<a name="line-76"></a><a name="Hashable"></a><span class='hs-keyword'>class</span> <span class='hs-conid'>Hashable</span> <span class='hs-varid'>a</span> <span class='hs-keyword'>where</span>
<a name="line-77"></a> <span class='hs-varid'>hashWithMax</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</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-78"></a> <span class='hs-varid'>hash</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-79"></a> <span class='hs-varid'>hash</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>hashWithMax</span> <span class='hs-varid'>maxHash</span>
<a name="line-80"></a>
<a name="line-81"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Enum</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Hashable</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span> <span class='hs-keyword'>where</span>
<a name="line-82"></a> <span class='hs-varid'>hashWithMax</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>h</span> <span class='hs-num'>0</span>
<a name="line-83"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>h</span> <span class='hs-varid'>a</span> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>a</span>
<a name="line-84"></a> <span class='hs-varid'>h</span> <span class='hs-varid'>a</span> <span class='hs-layout'>(</span><span class='hs-varid'>c</span><span class='hs-conop'>:</span><span class='hs-varid'>cs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>h</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-num'>17</span><span class='hs-varop'>*</span><span class='hs-layout'>(</span><span class='hs-varid'>fromEnum</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span><span class='hs-varop'>+</span><span class='hs-num'>19</span><span class='hs-varop'>*</span><span class='hs-varid'>a</span><span class='hs-layout'>)</span><span class='hs-varop'>`rem`</span><span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-varid'>cs</span>
<a name="line-85"></a>
<a name="line-86"></a><span class='hs-comment'>----</span>
</pre></body>
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