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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 : Text.JSON.ReadP</span>
<a name="line-4"></a><span class='hs-comment'>-- Copyright : (c) Galois, Inc. 2007-2009</span>
<a name="line-5"></a><span class='hs-comment'>-- License : BSD3</span>
<a name="line-6"></a><span class='hs-comment'>--</span>
<a name="line-7"></a><span class='hs-comment'>-- Maintainer: Sigbjorn Finne <sof@galois.com></span>
<a name="line-8"></a><span class='hs-comment'>-- Stability : provisional</span>
<a name="line-9"></a><span class='hs-comment'>-- Portability: portable</span>
<a name="line-10"></a><span class='hs-comment'>--</span>
<a name="line-11"></a><span class='hs-comment'>-- Parse JSON values using the ReadP combinators.</span>
<a name="line-12"></a>
<a name="line-13"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Text</span><span class='hs-varop'>.</span><span class='hs-conid'>JSON</span><span class='hs-varop'>.</span><span class='hs-conid'>ReadP</span>
<a name="line-14"></a> <span class='hs-layout'>(</span> <span class='hs-varid'>p_value</span>
<a name="line-15"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>p_null</span>
<a name="line-16"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>p_boolean</span>
<a name="line-17"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>p_array</span>
<a name="line-18"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>p_string</span>
<a name="line-19"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>p_object</span>
<a name="line-20"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>p_number</span>
<a name="line-21"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>p_js_string</span>
<a name="line-22"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>p_js_object</span>
<a name="line-23"></a> <span class='hs-layout'>,</span> <span class='hs-keyword'>module</span> <span class='hs-conid'>Text</span><span class='hs-varop'>.</span><span class='hs-conid'>ParserCombinators</span><span class='hs-varop'>.</span><span class='hs-conid'>ReadP</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'>Text</span><span class='hs-varop'>.</span><span class='hs-conid'>JSON</span><span class='hs-varop'>.</span><span class='hs-conid'>Types</span>
<a name="line-27"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Text</span><span class='hs-varop'>.</span><span class='hs-conid'>ParserCombinators</span><span class='hs-varop'>.</span><span class='hs-conid'>ReadP</span>
<a name="line-28"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</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'>Char</span>
<a name="line-30"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Numeric</span>
<a name="line-31"></a>
<a name="line-32"></a><a name="token"></a><span class='hs-definition'>token</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>ReadP</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ReadP</span> <span class='hs-varid'>a</span>
<a name="line-33"></a><span class='hs-definition'>token</span> <span class='hs-varid'>p</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>skipSpaces</span> <span class='hs-varop'>*></span> <span class='hs-varid'>p</span>
<a name="line-34"></a>
<a name="line-35"></a><a name="p_value"></a><span class='hs-definition'>p_value</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>ReadP</span> <span class='hs-conid'>JSValue</span>
<a name="line-36"></a><span class='hs-definition'>p_value</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-conid'>JSNull</span> <span class='hs-varop'><$</span> <span class='hs-varid'>p_null</span><span class='hs-layout'>)</span>
<a name="line-37"></a> <span class='hs-varop'><|></span> <span class='hs-layout'>(</span><span class='hs-conid'>JSBool</span> <span class='hs-varop'><$></span> <span class='hs-varid'>p_boolean</span><span class='hs-layout'>)</span>
<a name="line-38"></a> <span class='hs-varop'><|></span> <span class='hs-layout'>(</span><span class='hs-conid'>JSArray</span> <span class='hs-varop'><$></span> <span class='hs-varid'>p_array</span><span class='hs-layout'>)</span>
<a name="line-39"></a> <span class='hs-varop'><|></span> <span class='hs-layout'>(</span><span class='hs-conid'>JSString</span> <span class='hs-varop'><$></span> <span class='hs-varid'>p_js_string</span><span class='hs-layout'>)</span>
<a name="line-40"></a> <span class='hs-varop'><|></span> <span class='hs-layout'>(</span><span class='hs-conid'>JSObject</span> <span class='hs-varop'><$></span> <span class='hs-varid'>p_js_object</span><span class='hs-layout'>)</span>
<a name="line-41"></a> <span class='hs-varop'><|></span> <span class='hs-layout'>(</span><span class='hs-conid'>JSRational</span> <span class='hs-conid'>False</span> <span class='hs-varop'><$></span> <span class='hs-varid'>p_number</span><span class='hs-layout'>)</span>
<a name="line-42"></a>
<a name="line-43"></a><a name="p_null"></a><span class='hs-definition'>p_null</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>ReadP</span> <span class='hs-conid'>()</span>
<a name="line-44"></a><span class='hs-definition'>p_null</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>token</span> <span class='hs-layout'>(</span><span class='hs-varid'>string</span> <span class='hs-str'>"null"</span><span class='hs-layout'>)</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-conid'>()</span>
<a name="line-45"></a>
<a name="line-46"></a><a name="p_boolean"></a><span class='hs-definition'>p_boolean</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>ReadP</span> <span class='hs-conid'>Bool</span>
<a name="line-47"></a><span class='hs-definition'>p_boolean</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>token</span>
<a name="line-48"></a> <span class='hs-layout'>(</span> <span class='hs-layout'>(</span><span class='hs-conid'>True</span> <span class='hs-varop'><$</span> <span class='hs-varid'>string</span> <span class='hs-str'>"true"</span><span class='hs-layout'>)</span>
<a name="line-49"></a> <span class='hs-varop'><|></span> <span class='hs-layout'>(</span><span class='hs-conid'>False</span> <span class='hs-varop'><$</span> <span class='hs-varid'>string</span> <span class='hs-str'>"false"</span><span class='hs-layout'>)</span>
<a name="line-50"></a> <span class='hs-layout'>)</span>
<a name="line-51"></a>
<a name="line-52"></a><a name="p_array"></a><span class='hs-definition'>p_array</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>ReadP</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>JSValue</span><span class='hs-keyglyph'>]</span>
<a name="line-53"></a><span class='hs-definition'>p_array</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>between</span> <span class='hs-layout'>(</span><span class='hs-varid'>token</span> <span class='hs-layout'>(</span><span class='hs-varid'>char</span> <span class='hs-chr'>'['</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>token</span> <span class='hs-layout'>(</span><span class='hs-varid'>char</span> <span class='hs-chr'>']'</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-54"></a> <span class='hs-varop'>$</span> <span class='hs-varid'>p_value</span> <span class='hs-varop'>`sepBy`</span> <span class='hs-varid'>token</span> <span class='hs-layout'>(</span><span class='hs-varid'>char</span> <span class='hs-chr'>','</span><span class='hs-layout'>)</span>
<a name="line-55"></a>
<a name="line-56"></a><a name="p_string"></a><span class='hs-definition'>p_string</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>ReadP</span> <span class='hs-conid'>String</span>
<a name="line-57"></a><span class='hs-definition'>p_string</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>between</span> <span class='hs-layout'>(</span><span class='hs-varid'>token</span> <span class='hs-layout'>(</span><span class='hs-varid'>char</span> <span class='hs-chr'>'"'</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>char</span> <span class='hs-chr'>'"'</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>many</span> <span class='hs-varid'>p_char</span><span class='hs-layout'>)</span>
<a name="line-58"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>p_char</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>char</span> <span class='hs-chr'>'\\'</span> <span class='hs-varop'>>></span> <span class='hs-varid'>p_esc</span><span class='hs-layout'>)</span>
<a name="line-59"></a> <span class='hs-varop'><|></span> <span class='hs-layout'>(</span><span class='hs-varid'>satisfy</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>x</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>x</span> <span class='hs-varop'>/=</span> <span class='hs-chr'>'"'</span> <span class='hs-varop'>&&</span> <span class='hs-varid'>x</span> <span class='hs-varop'>/=</span> <span class='hs-chr'>'\\'</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-60"></a>
<a name="line-61"></a> <span class='hs-varid'>p_esc</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-chr'>'"'</span> <span class='hs-varop'><$</span> <span class='hs-varid'>char</span> <span class='hs-chr'>'"'</span><span class='hs-layout'>)</span>
<a name="line-62"></a> <span class='hs-varop'><|></span> <span class='hs-layout'>(</span><span class='hs-chr'>'\\'</span> <span class='hs-varop'><$</span> <span class='hs-varid'>char</span> <span class='hs-chr'>'\\'</span><span class='hs-layout'>)</span>
<a name="line-63"></a> <span class='hs-varop'><|></span> <span class='hs-layout'>(</span><span class='hs-chr'>'/'</span> <span class='hs-varop'><$</span> <span class='hs-varid'>char</span> <span class='hs-chr'>'/'</span><span class='hs-layout'>)</span>
<a name="line-64"></a> <span class='hs-varop'><|></span> <span class='hs-layout'>(</span><span class='hs-chr'>'\b'</span> <span class='hs-varop'><$</span> <span class='hs-varid'>char</span> <span class='hs-chr'>'b'</span><span class='hs-layout'>)</span>
<a name="line-65"></a> <span class='hs-varop'><|></span> <span class='hs-layout'>(</span><span class='hs-chr'>'\f'</span> <span class='hs-varop'><$</span> <span class='hs-varid'>char</span> <span class='hs-chr'>'f'</span><span class='hs-layout'>)</span>
<a name="line-66"></a> <span class='hs-varop'><|></span> <span class='hs-layout'>(</span><span class='hs-chr'>'\n'</span> <span class='hs-varop'><$</span> <span class='hs-varid'>char</span> <span class='hs-chr'>'n'</span><span class='hs-layout'>)</span>
<a name="line-67"></a> <span class='hs-varop'><|></span> <span class='hs-layout'>(</span><span class='hs-chr'>'\r'</span> <span class='hs-varop'><$</span> <span class='hs-varid'>char</span> <span class='hs-chr'>'r'</span><span class='hs-layout'>)</span>
<a name="line-68"></a> <span class='hs-varop'><|></span> <span class='hs-layout'>(</span><span class='hs-chr'>'\t'</span> <span class='hs-varop'><$</span> <span class='hs-varid'>char</span> <span class='hs-chr'>'t'</span><span class='hs-layout'>)</span>
<a name="line-69"></a> <span class='hs-varop'><|></span> <span class='hs-layout'>(</span><span class='hs-varid'>char</span> <span class='hs-chr'>'u'</span> <span class='hs-varop'>*></span> <span class='hs-varid'>p_uni</span><span class='hs-layout'>)</span>
<a name="line-70"></a>
<a name="line-71"></a> <span class='hs-varid'>p_uni</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>check</span> <span class='hs-varop'>=<<</span> <span class='hs-varid'>count</span> <span class='hs-num'>4</span> <span class='hs-layout'>(</span><span class='hs-varid'>satisfy</span> <span class='hs-varid'>isHexDigit</span><span class='hs-layout'>)</span>
<a name="line-72"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>check</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>code</span> <span class='hs-varop'><=</span> <span class='hs-varid'>max_char</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>pure</span> <span class='hs-layout'>(</span><span class='hs-varid'>toEnum</span> <span class='hs-varid'>code</span><span class='hs-layout'>)</span>
<a name="line-73"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>empty</span>
<a name="line-74"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>code</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fst</span> <span class='hs-varop'>$</span> <span class='hs-varid'>head</span> <span class='hs-varop'>$</span> <span class='hs-varid'>readHex</span> <span class='hs-varid'>x</span>
<a name="line-75"></a> <span class='hs-varid'>max_char</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fromEnum</span> <span class='hs-layout'>(</span><span class='hs-varid'>maxBound</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Char</span><span class='hs-layout'>)</span>
<a name="line-76"></a>
<a name="line-77"></a><a name="p_object"></a><span class='hs-definition'>p_object</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>ReadP</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>String</span><span class='hs-layout'>,</span><span class='hs-conid'>JSValue</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-78"></a><span class='hs-definition'>p_object</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>between</span> <span class='hs-layout'>(</span><span class='hs-varid'>token</span> <span class='hs-layout'>(</span><span class='hs-varid'>char</span> <span class='hs-chr'>'{'</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>token</span> <span class='hs-layout'>(</span><span class='hs-varid'>char</span> <span class='hs-chr'>'}'</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-79"></a> <span class='hs-varop'>$</span> <span class='hs-varid'>p_field</span> <span class='hs-varop'>`sepBy`</span> <span class='hs-varid'>token</span> <span class='hs-layout'>(</span><span class='hs-varid'>char</span> <span class='hs-chr'>','</span><span class='hs-layout'>)</span>
<a name="line-80"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>p_field</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>(,)</span> <span class='hs-varop'><$></span> <span class='hs-layout'>(</span><span class='hs-varid'>p_string</span> <span class='hs-varop'><*</span> <span class='hs-varid'>token</span> <span class='hs-layout'>(</span><span class='hs-varid'>char</span> <span class='hs-chr'>':'</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varop'><*></span> <span class='hs-varid'>p_value</span>
<a name="line-81"></a>
<a name="line-82"></a><a name="p_number"></a><span class='hs-definition'>p_number</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>ReadP</span> <span class='hs-conid'>Rational</span>
<a name="line-83"></a><span class='hs-definition'>p_number</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>readS_to_P</span> <span class='hs-layout'>(</span><span class='hs-varid'>readSigned</span> <span class='hs-varid'>readFloat</span><span class='hs-layout'>)</span>
<a name="line-84"></a>
<a name="line-85"></a><a name="p_js_string"></a><span class='hs-definition'>p_js_string</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>ReadP</span> <span class='hs-conid'>JSString</span>
<a name="line-86"></a><span class='hs-definition'>p_js_string</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>toJSString</span> <span class='hs-varop'><$></span> <span class='hs-varid'>p_string</span>
<a name="line-87"></a>
<a name="line-88"></a><a name="p_js_object"></a><span class='hs-definition'>p_js_object</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>ReadP</span> <span class='hs-layout'>(</span><span class='hs-conid'>JSObject</span> <span class='hs-conid'>JSValue</span><span class='hs-layout'>)</span>
<a name="line-89"></a><span class='hs-definition'>p_js_object</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>toJSObject</span> <span class='hs-varop'><$></span> <span class='hs-varid'>p_object</span>
<a name="line-90"></a>
<a name="line-91"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span>
<a name="line-92"></a><span class='hs-comment'>-- XXX: Because ReadP is not Applicative yet...</span>
<a name="line-93"></a>
<a name="line-94"></a><a name="pure"></a><span class='hs-definition'>pure</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ReadP</span> <span class='hs-varid'>a</span>
<a name="line-95"></a><span class='hs-definition'>pure</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span>
<a name="line-96"></a>
<a name="line-97"></a><a name="<*>"></a><span class='hs-layout'>(</span><span class='hs-varop'><*></span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>ReadP</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-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ReadP</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ReadP</span> <span class='hs-varid'>b</span>
<a name="line-98"></a><span class='hs-layout'>(</span><span class='hs-varop'><*></span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>ap</span>
<a name="line-99"></a>
<a name="line-100"></a><a name="*>"></a><span class='hs-layout'>(</span><span class='hs-varop'>*></span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>ReadP</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ReadP</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ReadP</span> <span class='hs-varid'>b</span>
<a name="line-101"></a><span class='hs-layout'>(</span><span class='hs-varop'>*></span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varop'>>></span><span class='hs-layout'>)</span>
<a name="line-102"></a>
<a name="line-103"></a><a name="<*"></a><span class='hs-layout'>(</span><span class='hs-varop'><*</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>ReadP</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ReadP</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ReadP</span> <span class='hs-varid'>a</span>
<a name="line-104"></a><a name="m"></a><span class='hs-definition'>m</span> <span class='hs-varop'><*</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>m</span><span class='hs-layout'>;</span> <span class='hs-varid'>n</span><span class='hs-layout'>;</span> <span class='hs-varid'>return</span> <span class='hs-varid'>x</span>
<a name="line-105"></a>
<a name="line-106"></a><a name="empty"></a><span class='hs-definition'>empty</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>ReadP</span> <span class='hs-varid'>a</span>
<a name="line-107"></a><span class='hs-definition'>empty</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>pfail</span>
<a name="line-108"></a>
<a name="line-109"></a><a name="<|>"></a><span class='hs-layout'>(</span><span class='hs-varop'><|></span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>ReadP</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ReadP</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ReadP</span> <span class='hs-varid'>a</span>
<a name="line-110"></a><span class='hs-layout'>(</span><span class='hs-varop'><|></span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varop'>+++</span><span class='hs-layout'>)</span>
<a name="line-111"></a>
<a name="line-112"></a><a name="<$>"></a><span class='hs-layout'>(</span><span class='hs-varop'><$></span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ReadP</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ReadP</span> <span class='hs-varid'>b</span>
<a name="line-113"></a><span class='hs-layout'>(</span><span class='hs-varop'><$></span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fmap</span>
<a name="line-114"></a>
<a name="line-115"></a><a name="<$"></a><span class='hs-layout'>(</span><span class='hs-varop'><$</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ReadP</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ReadP</span> <span class='hs-varid'>a</span>
<a name="line-116"></a><a name="x"></a><span class='hs-definition'>x</span> <span class='hs-varop'><$</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>m</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-varid'>x</span>
<a name="line-117"></a>
</pre></body>
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