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<pre><a name="line-1"></a><span class='hs-comment'>-- |</span>
<a name="line-2"></a><span class='hs-comment'>-- Module : Data.Double.Conversion.ByteString</span>
<a name="line-3"></a><span class='hs-comment'>-- Copyright : (c) 2011 MailRank, Inc.</span>
<a name="line-4"></a><span class='hs-comment'>--</span>
<a name="line-5"></a><span class='hs-comment'>-- License : BSD-style</span>
<a name="line-6"></a><span class='hs-comment'>-- Maintainer : bos@serpentine.com</span>
<a name="line-7"></a><span class='hs-comment'>-- Stability : experimental</span>
<a name="line-8"></a><span class='hs-comment'>-- Portability : GHC</span>
<a name="line-9"></a><span class='hs-comment'>--</span>
<a name="line-10"></a><span class='hs-comment'>-- Fast, efficient support for converting between double precision</span>
<a name="line-11"></a><span class='hs-comment'>-- floating point values and text.</span>
<a name="line-12"></a><span class='hs-comment'>--</span>
<a name="line-13"></a><span class='hs-comment'>-- Although about 15 times faster than plain 'show', these functions</span>
<a name="line-14"></a><span class='hs-comment'>-- are /slower/ than their 'Text' counterparts, at roughly half the</span>
<a name="line-15"></a><span class='hs-comment'>-- speed. (This seems to be due to the cost of allocating</span>
<a name="line-16"></a><span class='hs-comment'>-- 'ByteString' values via @malloc@.)</span>
<a name="line-17"></a>
<a name="line-18"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Double</span><span class='hs-varop'>.</span><span class='hs-conid'>Conversion</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span>
<a name="line-19"></a> <span class='hs-layout'>(</span>
<a name="line-20"></a> <span class='hs-varid'>toExponential</span>
<a name="line-21"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>toFixed</span>
<a name="line-22"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>toPrecision</span>
<a name="line-23"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>toShortest</span>
<a name="line-24"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-25"></a>
<a name="line-26"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span> <span class='hs-layout'>(</span><span class='hs-varid'>when</span><span class='hs-layout'>)</span>
<a name="line-27"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Foreign</span><span class='hs-varop'>.</span><span class='hs-conid'>ForeignPtr</span> <span class='hs-layout'>(</span><span class='hs-varid'>withForeignPtr</span><span class='hs-layout'>)</span>
<a name="line-28"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Double</span><span class='hs-varop'>.</span><span class='hs-conid'>Conversion</span><span class='hs-varop'>.</span><span class='hs-conid'>FFI</span>
<a name="line-29"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Word</span> <span class='hs-layout'>(</span><span class='hs-conid'>Word8</span><span class='hs-layout'>)</span>
<a name="line-30"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span><span class='hs-varop'>.</span><span class='hs-conid'>Internal</span> <span class='hs-layout'>(</span><span class='hs-conid'>ByteString</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'>mallocByteString</span><span class='hs-layout'>)</span>
<a name="line-31"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Foreign</span><span class='hs-varop'>.</span><span class='hs-conid'>C</span><span class='hs-varop'>.</span><span class='hs-conid'>Types</span> <span class='hs-layout'>(</span><span class='hs-conid'>CDouble</span><span class='hs-layout'>,</span> <span class='hs-conid'>CInt</span><span class='hs-layout'>)</span>
<a name="line-32"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Foreign</span><span class='hs-varop'>.</span><span class='hs-conid'>Ptr</span> <span class='hs-layout'>(</span><span class='hs-conid'>Ptr</span><span class='hs-layout'>)</span>
<a name="line-33"></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'>Unsafe</span> <span class='hs-layout'>(</span><span class='hs-varid'>unsafePerformIO</span><span class='hs-layout'>)</span>
<a name="line-34"></a>
<a name="line-35"></a><a name="toExponential"></a><span class='hs-comment'>-- | Compute a representation in exponential format with the requested</span>
<a name="line-36"></a><span class='hs-comment'>-- number of digits after the decimal point. The last emitted digit is</span>
<a name="line-37"></a><span class='hs-comment'>-- rounded. If -1 digits are requested, then the shortest exponential</span>
<a name="line-38"></a><span class='hs-comment'>-- representation is computed.</span>
<a name="line-39"></a><span class='hs-definition'>toExponential</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Double</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ByteString</span>
<a name="line-40"></a><span class='hs-definition'>toExponential</span> <span class='hs-varid'>ndigits</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>convert</span> <span class='hs-str'>"toExponential"</span> <span class='hs-varid'>len</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>val</span> <span class='hs-varid'>mba</span> <span class='hs-keyglyph'>-></span>
<a name="line-41"></a> <span class='hs-varid'>c_ToExponential</span> <span class='hs-varid'>val</span> <span class='hs-varid'>mba</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>ndigits</span><span class='hs-layout'>)</span>
<a name="line-42"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>len</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>c_ToExponentialLength</span>
<a name="line-43"></a> <span class='hs-comment'>{-# NOINLINE len #-}</span>
<a name="line-44"></a>
<a name="line-45"></a><a name="toFixed"></a><span class='hs-comment'>-- | Compute a decimal representation with a fixed number of digits</span>
<a name="line-46"></a><span class='hs-comment'>-- after the decimal point. The last emitted digit is rounded.</span>
<a name="line-47"></a><span class='hs-definition'>toFixed</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Double</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ByteString</span>
<a name="line-48"></a><span class='hs-definition'>toFixed</span> <span class='hs-varid'>ndigits</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>convert</span> <span class='hs-str'>"toFixed"</span> <span class='hs-varid'>len</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>val</span> <span class='hs-varid'>mba</span> <span class='hs-keyglyph'>-></span>
<a name="line-49"></a> <span class='hs-varid'>c_ToFixed</span> <span class='hs-varid'>val</span> <span class='hs-varid'>mba</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>ndigits</span><span class='hs-layout'>)</span>
<a name="line-50"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>len</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>c_ToFixedLength</span>
<a name="line-51"></a> <span class='hs-comment'>{-# NOINLINE len #-}</span>
<a name="line-52"></a>
<a name="line-53"></a><a name="toShortest"></a><span class='hs-comment'>-- | Compute the shortest string of digits that correctly represent</span>
<a name="line-54"></a><span class='hs-comment'>-- the input number.</span>
<a name="line-55"></a><span class='hs-definition'>toShortest</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Double</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ByteString</span>
<a name="line-56"></a><span class='hs-definition'>toShortest</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>convert</span> <span class='hs-str'>"toShortest"</span> <span class='hs-varid'>len</span> <span class='hs-varid'>c_ToShortest</span>
<a name="line-57"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>len</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>c_ToShortestLength</span>
<a name="line-58"></a> <span class='hs-comment'>{-# NOINLINE len #-}</span>
<a name="line-59"></a>
<a name="line-60"></a><a name="toPrecision"></a><span class='hs-comment'>-- | Compute @precision@ leading digits of the given value either in</span>
<a name="line-61"></a><span class='hs-comment'>-- exponential or decimal format. The last computed digit is rounded.</span>
<a name="line-62"></a><span class='hs-definition'>toPrecision</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Double</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ByteString</span>
<a name="line-63"></a><span class='hs-definition'>toPrecision</span> <span class='hs-varid'>ndigits</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>convert</span> <span class='hs-str'>"toPrecision"</span> <span class='hs-varid'>len</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>val</span> <span class='hs-varid'>mba</span> <span class='hs-keyglyph'>-></span>
<a name="line-64"></a> <span class='hs-varid'>c_ToPrecision</span> <span class='hs-varid'>val</span> <span class='hs-varid'>mba</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>ndigits</span><span class='hs-layout'>)</span>
<a name="line-65"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>len</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>c_ToPrecisionLength</span>
<a name="line-66"></a> <span class='hs-comment'>{-# NOINLINE len #-}</span>
<a name="line-67"></a>
<a name="line-68"></a><a name="convert"></a><span class='hs-definition'>convert</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CInt</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>CDouble</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Ptr</span> <span class='hs-conid'>Word8</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>CInt</span><span class='hs-layout'>)</span>
<a name="line-69"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Double</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ByteString</span>
<a name="line-70"></a><span class='hs-definition'>convert</span> <span class='hs-varid'>func</span> <span class='hs-varid'>len</span> <span class='hs-varid'>act</span> <span class='hs-varid'>val</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>unsafePerformIO</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span>
<a name="line-71"></a> <span class='hs-varid'>fp</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>mallocByteString</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>len</span><span class='hs-layout'>)</span>
<a name="line-72"></a> <span class='hs-varid'>size</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>withForeignPtr</span> <span class='hs-varid'>fp</span> <span class='hs-varop'>$</span> <span class='hs-varid'>act</span> <span class='hs-layout'>(</span><span class='hs-varid'>realToFrac</span> <span class='hs-varid'>val</span><span class='hs-layout'>)</span>
<a name="line-73"></a> <span class='hs-varid'>when</span> <span class='hs-layout'>(</span><span class='hs-varid'>size</span> <span class='hs-varop'>==</span> <span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varop'>.</span>
<a name="line-74"></a> <span class='hs-varid'>fail</span> <span class='hs-varop'>$</span> <span class='hs-str'>"Data.Double.Conversion.ByteString."</span> <span class='hs-varop'>++</span> <span class='hs-varid'>func</span> <span class='hs-varop'>++</span>
<a name="line-75"></a> <span class='hs-str'>": conversion failed (invalid precision requested)"</span>
<a name="line-76"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-conid'>PS</span> <span class='hs-varid'>fp</span> <span class='hs-num'>0</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>size</span><span class='hs-layout'>)</span>
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