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æternity Sophia Language
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aeso_aci
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aeso_aci
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<h1 id="aeso_aci">aeso_aci</h1>
<h3 id="module">Module</h3>
<h3 id="aeso_aci_1">aeso_aci</h3>
<p>The ACI interface encoder and decoder.</p>
<h3 id="description">Description</h3>
<p>This module provides an interface to generate and convert between
Sophia contracts and a suitable JSON encoding of contract
interface. As yet the interface is very basic.</p>
<p>Encoding this contract:</p>
<div class="highlight"><pre><span></span><code>contract Answers =
record state = { a : answers }
type answers() = map(string, int)
stateful function init() = { a = {} }
private function the_answer() = 42
function new_answer(q : string, a : int) : answers() = { [q] = a }
</code></pre></div>
<p>generates the following JSON structure representing the contract interface:</p>
<div class="highlight"><pre><span></span><code><span class="p">{</span><span class="w"></span>
<span class="w"> </span><span class="nt">&quot;contract&quot;</span><span class="p">:</span><span class="w"> </span><span class="p">{</span><span class="w"></span>
<span class="w"> </span><span class="nt">&quot;functions&quot;</span><span class="p">:</span><span class="w"> </span><span class="p">[</span><span class="w"></span>
<span class="w"> </span><span class="p">{</span><span class="w"></span>
<span class="w"> </span><span class="nt">&quot;arguments&quot;</span><span class="p">:</span><span class="w"> </span><span class="p">[],</span><span class="w"></span>
<span class="w"> </span><span class="nt">&quot;name&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;init&quot;</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="nt">&quot;returns&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;Answers.state&quot;</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="nt">&quot;stateful&quot;</span><span class="p">:</span><span class="w"> </span><span class="kc">true</span><span class="w"></span>
<span class="w"> </span><span class="p">},</span><span class="w"></span>
<span class="w"> </span><span class="p">{</span><span class="w"></span>
<span class="w"> </span><span class="nt">&quot;arguments&quot;</span><span class="p">:</span><span class="w"> </span><span class="p">[</span><span class="w"></span>
<span class="w"> </span><span class="p">{</span><span class="w"></span>
<span class="w"> </span><span class="nt">&quot;name&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;q&quot;</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="nt">&quot;type&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;string&quot;</span><span class="w"></span>
<span class="w"> </span><span class="p">},</span><span class="w"></span>
<span class="w"> </span><span class="p">{</span><span class="w"></span>
<span class="w"> </span><span class="nt">&quot;name&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;a&quot;</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="nt">&quot;type&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;int&quot;</span><span class="w"></span>
<span class="w"> </span><span class="p">}</span><span class="w"></span>
<span class="w"> </span><span class="p">],</span><span class="w"></span>
<span class="w"> </span><span class="nt">&quot;name&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;new_answer&quot;</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="nt">&quot;returns&quot;</span><span class="p">:</span><span class="w"> </span><span class="p">{</span><span class="w"></span>
<span class="w"> </span><span class="nt">&quot;map&quot;</span><span class="p">:</span><span class="w"> </span><span class="p">[</span><span class="w"></span>
<span class="w"> </span><span class="s2">&quot;string&quot;</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="s2">&quot;int&quot;</span><span class="w"></span>
<span class="w"> </span><span class="p">]</span><span class="w"></span>
<span class="w"> </span><span class="p">},</span><span class="w"></span>
<span class="w"> </span><span class="nt">&quot;stateful&quot;</span><span class="p">:</span><span class="w"> </span><span class="kc">false</span><span class="w"></span>
<span class="w"> </span><span class="p">}</span><span class="w"></span>
<span class="w"> </span><span class="p">],</span><span class="w"></span>
<span class="w"> </span><span class="nt">&quot;name&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;Answers&quot;</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="nt">&quot;state&quot;</span><span class="p">:</span><span class="w"> </span><span class="p">{</span><span class="w"></span>
<span class="w"> </span><span class="nt">&quot;record&quot;</span><span class="p">:</span><span class="w"> </span><span class="p">[</span><span class="w"></span>
<span class="w"> </span><span class="p">{</span><span class="w"></span>
<span class="w"> </span><span class="nt">&quot;name&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;a&quot;</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="nt">&quot;type&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;Answers.answers&quot;</span><span class="w"></span>
<span class="w"> </span><span class="p">}</span><span class="w"></span>
<span class="w"> </span><span class="p">]</span><span class="w"></span>
<span class="w"> </span><span class="p">},</span><span class="w"></span>
<span class="w"> </span><span class="nt">&quot;type_defs&quot;</span><span class="p">:</span><span class="w"> </span><span class="p">[</span><span class="w"></span>
<span class="w"> </span><span class="p">{</span><span class="w"></span>
<span class="w"> </span><span class="nt">&quot;name&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;answers&quot;</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="nt">&quot;typedef&quot;</span><span class="p">:</span><span class="w"> </span><span class="p">{</span><span class="w"></span>
<span class="w"> </span><span class="nt">&quot;map&quot;</span><span class="p">:</span><span class="w"> </span><span class="p">[</span><span class="w"></span>
<span class="w"> </span><span class="s2">&quot;string&quot;</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="s2">&quot;int&quot;</span><span class="w"></span>
<span class="w"> </span><span class="p">]</span><span class="w"></span>
<span class="w"> </span><span class="p">},</span><span class="w"></span>
<span class="w"> </span><span class="nt">&quot;vars&quot;</span><span class="p">:</span><span class="w"> </span><span class="p">[]</span><span class="w"></span>
<span class="w"> </span><span class="p">}</span><span class="w"></span>
<span class="w"> </span><span class="p">]</span><span class="w"></span>
<span class="w"> </span><span class="p">}</span><span class="w"></span>
<span class="p">}</span><span class="w"></span>
</code></pre></div>
<p>When that encoding is decoded the following include definition is generated:</p>
<div class="highlight"><pre><span></span><code>contract Answers =
record state = {a : Answers.answers}
type answers = map(string, int)
function init : () =&gt; Answers.state
function new_answer : (string, int) =&gt; map(string, int)
</code></pre></div>
<h3 id="types">Types</h3>
<div class="highlight"><pre><span></span><code><span class="p">-</span><span class="ni">type</span><span class="w"> </span><span class="n">aci_type</span><span class="p">()</span><span class="w"> </span><span class="p">::</span><span class="w"> </span><span class="n">json</span><span class="w"> </span><span class="p">|</span><span class="w"> </span><span class="n">string</span><span class="p">.</span><span class="w"></span>
<span class="p">-</span><span class="ni">type</span><span class="w"> </span><span class="n">json</span><span class="p">()</span><span class="w"> </span><span class="p">::</span><span class="w"> </span><span class="nn">jsx</span><span class="p">:</span><span class="nf">json_term</span><span class="p">().</span><span class="w"></span>
<span class="p">-</span><span class="ni">type</span><span class="w"> </span><span class="n">json_text</span><span class="p">()</span><span class="w"> </span><span class="p">::</span><span class="w"> </span><span class="n">binary</span><span class="p">().</span><span class="w"></span>
</code></pre></div>
<h3 id="exports">Exports</h3>
<h4 id="contract_interfaceaci_type-string-ok-json-string-error-term">contract_interface(aci_type(), string()) -&gt; {ok, json() | string()} | {error, term()}</h4>
<p>Generate the JSON encoding of the interface to a contract. The type definitions
and non-private functions are included in the JSON string.</p>
<h4 id="render_aci_jsonjson-json_text-string">render_aci_json(json() | json_text()) -&gt; string().</h4>
<p>Take a JSON encoding of a contract interface and generate a contract interface
that can be included in another contract.</p>
<h3 id="example-run">Example run</h3>
<p>This is an example of using the ACI generator from an Erlang shell. The file
called <code>aci_test.aes</code> contains the contract in the description from which we
want to generate files <code>aci_test.json</code> which is the JSON encoding of the
contract interface and <code>aci_test.include</code> which is the contract definition to
be included inside another contract.</p>
<div class="highlight"><pre><span></span><code><span class="mi">1</span><span class="o">&gt;</span><span class="w"> </span><span class="p">{</span><span class="n">ok</span><span class="p">,</span><span class="nv">Contract</span><span class="p">}</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nn">file</span><span class="p">:</span><span class="nf">read_file</span><span class="p">(</span><span class="s">&quot;aci_test.aes&quot;</span><span class="p">).</span><span class="w"></span>
<span class="p">{</span><span class="n">ok</span><span class="p">,</span><span class="o">&lt;&lt;</span><span class="s">&quot;contract Answers =</span><span class="se">\n</span><span class="s"> record state = { a : answers }</span><span class="se">\n</span><span class="s"> type answers() = map(string, int)</span><span class="se">\n\n</span><span class="s"> stateful function&quot;</span><span class="p">...</span><span class="o">&gt;&gt;</span><span class="p">}</span><span class="w"></span>
<span class="mi">2</span><span class="o">&gt;</span><span class="w"> </span><span class="p">{</span><span class="n">ok</span><span class="p">,</span><span class="nv">JsonACI</span><span class="p">}</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nn">aeso_aci</span><span class="p">:</span><span class="nf">contract_interface</span><span class="p">(</span><span class="n">json</span><span class="p">,</span><span class="w"> </span><span class="nv">Contract</span><span class="p">).</span><span class="w"></span>
<span class="p">{</span><span class="n">ok</span><span class="p">,[#{</span><span class="n">contract</span><span class="w"> </span><span class="o">=&gt;</span><span class="w"></span>
<span class="w"> </span><span class="p">#{</span><span class="n">functions</span><span class="w"> </span><span class="o">=&gt;</span><span class="w"></span>
<span class="w"> </span><span class="p">[#{</span><span class="n">arguments</span><span class="w"> </span><span class="o">=&gt;</span><span class="w"> </span><span class="p">[],</span><span class="n">name</span><span class="w"> </span><span class="o">=&gt;</span><span class="w"> </span><span class="o">&lt;&lt;</span><span class="s">&quot;init&quot;</span><span class="o">&gt;&gt;</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="n">returns</span><span class="w"> </span><span class="o">=&gt;</span><span class="w"> </span><span class="o">&lt;&lt;</span><span class="s">&quot;Answers.state&quot;</span><span class="o">&gt;&gt;</span><span class="p">,</span><span class="n">stateful</span><span class="w"> </span><span class="o">=&gt;</span><span class="w"> </span><span class="n">true</span><span class="p">},</span><span class="w"></span>
<span class="w"> </span><span class="p">#{</span><span class="n">arguments</span><span class="w"> </span><span class="o">=&gt;</span><span class="w"></span>
<span class="w"> </span><span class="p">[#{</span><span class="n">name</span><span class="w"> </span><span class="o">=&gt;</span><span class="w"> </span><span class="o">&lt;&lt;</span><span class="s">&quot;q&quot;</span><span class="o">&gt;&gt;</span><span class="p">,</span><span class="n">type</span><span class="w"> </span><span class="o">=&gt;</span><span class="w"> </span><span class="o">&lt;&lt;</span><span class="s">&quot;string&quot;</span><span class="o">&gt;&gt;</span><span class="p">},</span><span class="w"></span>
<span class="w"> </span><span class="p">#{</span><span class="n">name</span><span class="w"> </span><span class="o">=&gt;</span><span class="w"> </span><span class="o">&lt;&lt;</span><span class="s">&quot;a&quot;</span><span class="o">&gt;&gt;</span><span class="p">,</span><span class="n">type</span><span class="w"> </span><span class="o">=&gt;</span><span class="w"> </span><span class="o">&lt;&lt;</span><span class="s">&quot;int&quot;</span><span class="o">&gt;&gt;</span><span class="p">}],</span><span class="w"></span>
<span class="w"> </span><span class="n">name</span><span class="w"> </span><span class="o">=&gt;</span><span class="w"> </span><span class="o">&lt;&lt;</span><span class="s">&quot;new_answer&quot;</span><span class="o">&gt;&gt;</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="n">returns</span><span class="w"> </span><span class="o">=&gt;</span><span class="w"> </span><span class="p">#{</span><span class="o">&lt;&lt;</span><span class="s">&quot;map&quot;</span><span class="o">&gt;&gt;</span><span class="w"> </span><span class="o">=&gt;</span><span class="w"> </span><span class="p">[</span><span class="o">&lt;&lt;</span><span class="s">&quot;string&quot;</span><span class="o">&gt;&gt;</span><span class="p">,</span><span class="o">&lt;&lt;</span><span class="s">&quot;int&quot;</span><span class="o">&gt;&gt;</span><span class="p">]},</span><span class="w"></span>
<span class="w"> </span><span class="n">stateful</span><span class="w"> </span><span class="o">=&gt;</span><span class="w"> </span><span class="n">false</span><span class="p">}],</span><span class="w"></span>
<span class="w"> </span><span class="n">name</span><span class="w"> </span><span class="o">=&gt;</span><span class="w"> </span><span class="o">&lt;&lt;</span><span class="s">&quot;Answers&quot;</span><span class="o">&gt;&gt;</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="n">state</span><span class="w"> </span><span class="o">=&gt;</span><span class="w"></span>
<span class="w"> </span><span class="p">#{</span><span class="n">record</span><span class="w"> </span><span class="o">=&gt;</span><span class="w"></span>
<span class="w"> </span><span class="p">[#{</span><span class="n">name</span><span class="w"> </span><span class="o">=&gt;</span><span class="w"> </span><span class="o">&lt;&lt;</span><span class="s">&quot;a&quot;</span><span class="o">&gt;&gt;</span><span class="p">,</span><span class="n">type</span><span class="w"> </span><span class="o">=&gt;</span><span class="w"> </span><span class="o">&lt;&lt;</span><span class="s">&quot;Answers.answers&quot;</span><span class="o">&gt;&gt;</span><span class="p">}]},</span><span class="w"></span>
<span class="w"> </span><span class="n">type_defs</span><span class="w"> </span><span class="o">=&gt;</span><span class="w"></span>
<span class="w"> </span><span class="p">[#{</span><span class="n">name</span><span class="w"> </span><span class="o">=&gt;</span><span class="w"> </span><span class="o">&lt;&lt;</span><span class="s">&quot;answers&quot;</span><span class="o">&gt;&gt;</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="n">typedef</span><span class="w"> </span><span class="o">=&gt;</span><span class="w"> </span><span class="p">#{</span><span class="o">&lt;&lt;</span><span class="s">&quot;map&quot;</span><span class="o">&gt;&gt;</span><span class="w"> </span><span class="o">=&gt;</span><span class="w"> </span><span class="p">[</span><span class="o">&lt;&lt;</span><span class="s">&quot;string&quot;</span><span class="o">&gt;&gt;</span><span class="p">,</span><span class="o">&lt;&lt;</span><span class="s">&quot;int&quot;</span><span class="o">&gt;&gt;</span><span class="p">]},</span><span class="w"></span>
<span class="w"> </span><span class="n">vars</span><span class="w"> </span><span class="o">=&gt;</span><span class="w"> </span><span class="p">[]}]}}]}</span><span class="w"></span>
<span class="mi">3</span><span class="o">&gt;</span><span class="w"> </span><span class="nn">file</span><span class="p">:</span><span class="nf">write_file</span><span class="p">(</span><span class="s">&quot;aci_test.aci&quot;</span><span class="p">,</span><span class="w"> </span><span class="nn">jsx</span><span class="p">:</span><span class="nf">encode</span><span class="p">(</span><span class="nv">JsonACI</span><span class="p">)).</span><span class="w"></span>
<span class="n">ok</span><span class="w"></span>
<span class="mi">4</span><span class="o">&gt;</span><span class="w"> </span><span class="p">{</span><span class="n">ok</span><span class="p">,</span><span class="nv">InterfaceStub</span><span class="p">}</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nn">aeso_aci</span><span class="p">:</span><span class="nf">render_aci_json</span><span class="p">(</span><span class="nv">JsonACI</span><span class="p">).</span><span class="w"></span>
<span class="p">{</span><span class="n">ok</span><span class="p">,</span><span class="o">&lt;&lt;</span><span class="s">&quot;contract Answers =</span><span class="se">\n</span><span class="s"> record state = {a : Answers.answers}</span><span class="se">\n</span><span class="s"> type answers = map(string, int)</span><span class="se">\n</span><span class="s"> function init &quot;</span><span class="p">...</span><span class="o">&gt;&gt;</span><span class="p">}</span><span class="w"></span>
<span class="mi">5</span><span class="o">&gt;</span><span class="w"> </span><span class="nn">file</span><span class="p">:</span><span class="nf">write_file</span><span class="p">(</span><span class="s">&quot;aci_test.include&quot;</span><span class="p">,</span><span class="w"> </span><span class="nv">InterfaceStub</span><span class="p">).</span><span class="w"></span>
<span class="n">ok</span><span class="w"></span>
<span class="mi">6</span><span class="o">&gt;</span><span class="w"> </span><span class="nn">jsx</span><span class="p">:</span><span class="nf">prettify</span><span class="p">(</span><span class="nn">jsx</span><span class="p">:</span><span class="nf">encode</span><span class="p">(</span><span class="nv">JsonACI</span><span class="p">)).</span><span class="w"></span>
<span class="o">&lt;&lt;</span><span class="s">&quot;[</span><span class="se">\n</span><span class="s"> {</span><span class="se">\n</span><span class="s"> </span><span class="se">\&quot;</span><span class="s">contract</span><span class="se">\&quot;</span><span class="s">: {</span><span class="se">\n</span><span class="s"> </span><span class="se">\&quot;</span><span class="s">functions</span><span class="se">\&quot;</span><span class="s">: [</span><span class="se">\n</span><span class="s"> {</span><span class="se">\n</span><span class="s"> </span><span class="se">\&quot;</span><span class="s">arguments</span><span class="se">\&quot;</span><span class="s">: [],</span><span class="se">\n</span><span class="s"> </span><span class="se">\&quot;</span><span class="s">name</span><span class="se">\&quot;</span><span class="s">: </span><span class="se">\&quot;</span><span class="s">init</span><span class="se">\&quot;</span><span class="s">,</span><span class="se">\n</span><span class="s"> &quot;</span><span class="p">...</span><span class="o">&gt;&gt;</span><span class="w"></span>
</code></pre></div>
<p>The final call to <code>jsx:prettify(jsx:encode(JsonACI))</code> returns the encoding in a
more easily readable form. This is what is shown in the description above.</p>
</article>
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