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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE DeriveDataTypeable #-}</span>
<a name="line-2"></a><span class='hs-comment'>--------------------------------------------------------------------</span>
<a name="line-3"></a><span class='hs-comment'>-- |</span>
<a name="line-4"></a><span class='hs-comment'>-- Module : Text.JSON.Types</span>
<a name="line-5"></a><span class='hs-comment'>-- Copyright : (c) Galois, Inc. 2007-2009</span>
<a name="line-6"></a><span class='hs-comment'>-- License : BSD3</span>
<a name="line-7"></a><span class='hs-comment'>--</span>
<a name="line-8"></a><span class='hs-comment'>-- Maintainer: Sigbjorn Finne <sof@galois.com></span>
<a name="line-9"></a><span class='hs-comment'>-- Stability : provisional</span>
<a name="line-10"></a><span class='hs-comment'>-- Portability: portable</span>
<a name="line-11"></a><span class='hs-comment'>--</span>
<a name="line-12"></a><span class='hs-comment'>--------------------------------------------------------------------</span>
<a name="line-13"></a><span class='hs-comment'>--</span>
<a name="line-14"></a><span class='hs-comment'>-- Basic support for working with JSON values.</span>
<a name="line-15"></a><span class='hs-comment'>--</span>
<a name="line-16"></a>
<a name="line-17"></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'>Types</span> <span class='hs-layout'>(</span>
<a name="line-18"></a>
<a name="line-19"></a> <span class='hs-comment'>-- * JSON Types</span>
<a name="line-20"></a> <span class='hs-conid'>JSValue</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-21"></a>
<a name="line-22"></a> <span class='hs-comment'>-- * Wrapper Types</span>
<a name="line-23"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>JSString</span><span class='hs-layout'>(</span><span class='hs-comment'>{-fromJSString-}</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-24"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>toJSString</span>
<a name="line-25"></a>
<a name="line-26"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>JSObject</span><span class='hs-layout'>(</span><span class='hs-comment'>{-fromJSObject-}</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-27"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>toJSObject</span>
<a name="line-28"></a>
<a name="line-29"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>get_field</span>
<a name="line-30"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>set_field</span>
<a name="line-31"></a>
<a name="line-32"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-33"></a>
<a name="line-34"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Typeable</span> <span class='hs-layout'>(</span> <span class='hs-conid'>Typeable</span> <span class='hs-layout'>)</span>
<a name="line-35"></a>
<a name="line-36"></a><a name="JSValue"></a><span class='hs-comment'>--</span>
<a name="line-37"></a><a name="JSValue"></a><span class='hs-comment'>-- | JSON values</span>
<a name="line-38"></a><a name="JSValue"></a><span class='hs-comment'>--</span>
<a name="line-39"></a><a name="JSValue"></a><span class='hs-comment'>-- The type to which we encode Haskell values. There's a set</span>
<a name="line-40"></a><a name="JSValue"></a><span class='hs-comment'>-- of primitives, and a couple of heterogenous collection types.</span>
<a name="line-41"></a><a name="JSValue"></a><span class='hs-comment'>--</span>
<a name="line-42"></a><a name="JSValue"></a><span class='hs-comment'>-- Objects:</span>
<a name="line-43"></a><a name="JSValue"></a><span class='hs-comment'>--</span>
<a name="line-44"></a><a name="JSValue"></a><span class='hs-comment'>-- An object structure is represented as a pair of curly brackets</span>
<a name="line-45"></a><a name="JSValue"></a><span class='hs-comment'>-- surrounding zero or more name\/value pairs (or members). A name is a</span>
<a name="line-46"></a><a name="JSValue"></a><span class='hs-comment'>-- string. A single colon comes after each name, separating the name</span>
<a name="line-47"></a><a name="JSValue"></a><span class='hs-comment'>-- from the value. A single comma separates a value from a</span>
<a name="line-48"></a><a name="JSValue"></a><span class='hs-comment'>-- following name.</span>
<a name="line-49"></a><a name="JSValue"></a><span class='hs-comment'>--</span>
<a name="line-50"></a><a name="JSValue"></a><span class='hs-comment'>-- Arrays:</span>
<a name="line-51"></a><a name="JSValue"></a><span class='hs-comment'>--</span>
<a name="line-52"></a><a name="JSValue"></a><span class='hs-comment'>-- An array structure is represented as square brackets surrounding</span>
<a name="line-53"></a><a name="JSValue"></a><span class='hs-comment'>-- zero or more values (or elements). Elements are separated by commas.</span>
<a name="line-54"></a><a name="JSValue"></a><span class='hs-comment'>--</span>
<a name="line-55"></a><a name="JSValue"></a><span class='hs-comment'>-- Only valid JSON can be constructed this way</span>
<a name="line-56"></a><a name="JSValue"></a><span class='hs-comment'>--</span>
<a name="line-57"></a><a name="JSValue"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>JSValue</span>
<a name="line-58"></a> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>JSNull</span>
<a name="line-59"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>JSBool</span> <span class='hs-varop'>!</span><span class='hs-conid'>Bool</span>
<a name="line-60"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>JSRational</span> <span class='hs-conid'>Bool</span><span class='hs-comment'>{-as Float?-}</span> <span class='hs-varop'>!</span><span class='hs-conid'>Rational</span>
<a name="line-61"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>JSString</span> <span class='hs-conid'>JSString</span>
<a name="line-62"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>JSArray</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>JSValue</span><span class='hs-keyglyph'>]</span>
<a name="line-63"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>JSObject</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-64"></a> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span><span class='hs-conid'>Show</span><span class='hs-layout'>,</span> <span class='hs-conid'>Read</span><span class='hs-layout'>,</span> <span class='hs-conid'>Eq</span><span class='hs-layout'>,</span> <span class='hs-conid'>Ord</span><span class='hs-layout'>,</span> <span class='hs-conid'>Typeable</span><span class='hs-layout'>)</span>
<a name="line-65"></a>
<a name="line-66"></a><a name="JSString"></a><span class='hs-comment'>-- | Strings can be represented a little more efficiently in JSON</span>
<a name="line-67"></a><a name="JSString"></a><span class='hs-keyword'>newtype</span> <span class='hs-conid'>JSString</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>JSONString</span> <span class='hs-layout'>{</span> <span class='hs-varid'>fromJSString</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-layout'>}</span>
<a name="line-68"></a> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span><span class='hs-conid'>Eq</span><span class='hs-layout'>,</span> <span class='hs-conid'>Ord</span><span class='hs-layout'>,</span> <span class='hs-conid'>Show</span><span class='hs-layout'>,</span> <span class='hs-conid'>Read</span><span class='hs-layout'>,</span> <span class='hs-conid'>Typeable</span><span class='hs-layout'>)</span>
<a name="line-69"></a>
<a name="line-70"></a><a name="toJSString"></a><span class='hs-comment'>-- | Turn a Haskell string into a JSON string.</span>
<a name="line-71"></a><span class='hs-definition'>toJSString</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>JSString</span>
<a name="line-72"></a><span class='hs-definition'>toJSString</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>JSONString</span>
<a name="line-73"></a> <span class='hs-comment'>-- Note: we don't encode the string yet, that's done when serializing.</span>
<a name="line-74"></a>
<a name="line-75"></a><a name="JSObject"></a><span class='hs-comment'>-- | As can association lists</span>
<a name="line-76"></a><a name="JSObject"></a><span class='hs-keyword'>newtype</span> <span class='hs-conid'>JSObject</span> <span class='hs-varid'>e</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>JSONObject</span> <span class='hs-layout'>{</span> <span class='hs-varid'>fromJSObject</span> <span class='hs-keyglyph'>::</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'>e</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span> <span class='hs-layout'>}</span>
<a name="line-77"></a> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span><span class='hs-conid'>Eq</span><span class='hs-layout'>,</span> <span class='hs-conid'>Ord</span><span class='hs-layout'>,</span> <span class='hs-conid'>Show</span><span class='hs-layout'>,</span> <span class='hs-conid'>Read</span><span class='hs-layout'>,</span> <span class='hs-conid'>Typeable</span> <span class='hs-layout'>)</span>
<a name="line-78"></a>
<a name="line-79"></a><a name="toJSObject"></a><span class='hs-comment'>-- | Make JSON object out of an association list.</span>
<a name="line-80"></a><span class='hs-definition'>toJSObject</span> <span class='hs-keyglyph'>::</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'>a</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>JSObject</span> <span class='hs-varid'>a</span>
<a name="line-81"></a><span class='hs-definition'>toJSObject</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>JSONObject</span>
<a name="line-82"></a>
<a name="line-83"></a><a name="get_field"></a><span class='hs-comment'>-- | Get the value of a field, if it exist.</span>
<a name="line-84"></a><span class='hs-definition'>get_field</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>JSObject</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-varid'>a</span>
<a name="line-85"></a><span class='hs-definition'>get_field</span> <span class='hs-layout'>(</span><span class='hs-conid'>JSONObject</span> <span class='hs-varid'>xs</span><span class='hs-layout'>)</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>lookup</span> <span class='hs-varid'>x</span> <span class='hs-varid'>xs</span>
<a name="line-86"></a>
<a name="line-87"></a><a name="set_field"></a><span class='hs-comment'>-- | Set the value of a field. Previous values are overwritten.</span>
<a name="line-88"></a><span class='hs-definition'>set_field</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>JSObject</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>JSObject</span> <span class='hs-varid'>a</span>
<a name="line-89"></a><span class='hs-definition'>set_field</span> <span class='hs-layout'>(</span><span class='hs-conid'>JSONObject</span> <span class='hs-varid'>xs</span><span class='hs-layout'>)</span> <span class='hs-varid'>k</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>JSONObject</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varid'>k</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-varid'>filter</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varop'>/=</span> <span class='hs-varid'>k</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-varid'>xs</span><span class='hs-layout'>)</span>
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