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<header class="md-header" data-md-component="header">
<header class="md-header" data-md-component="header">
<nav class="md-header__inner md-grid" aria-label="Header">
<a href=".." title="æternity Sophia Language" class="md-header__button md-logo" aria-label="æternity Sophia Language" data-md-component="logo">
@@ -134,14 +136,24 @@
<label class="md-search__overlay" for="__search"></label>
<div class="md-search__inner" role="search">
<form class="md-search__form" name="search">
<input type="text" class="md-search__input" name="query" aria-label="Search" placeholder="Search" autocapitalize="off" autocorrect="off" autocomplete="off" spellcheck="false" data-md-component="search-query" data-md-state="active" required>
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</div>
</nav>
</header>
<div class="md-container" data-md-component="container">
<main class="md-main" data-md-component="main">
<div class="md-main__inner md-grid">
@@ -257,6 +272,8 @@
</a>
<nav class="md-nav md-nav--secondary" aria-label="Table of contents">
@@ -440,6 +457,8 @@
<div class="md-sidebar__scrollwrap">
<div class="md-sidebar__inner">
<nav class="md-nav md-nav--secondary" aria-label="Table of contents">
@@ -562,8 +581,9 @@
<p>Single line comments start with <code>//</code> and block comments are enclosed in <code>/*</code>
and <code>*/</code> and can be nested.</p>
<h3 id="keywords">Keywords</h3>
<p><code>contract elif else entrypoint false function if import include let mod namespace
private payable stateful switch true type record datatype main interface</code></p>
<div class="highlight"><pre><span></span><code>contract elif else entrypoint false function if import include let mod namespace
private payable stateful switch true type record datatype main interface
</code></pre></div>
<h3 id="tokens">Tokens</h3>
<ul>
<li><code>Id = [a-z_][A-Za-z0-9_']*</code> identifiers start with a lower case letter.</li>
@@ -641,13 +661,13 @@ indented more than the currently enclosing layout block. Blocks with a single
element can be written on the same line as the previous token.</p>
<p>Each element of the block must share the same indentation and no part of an
element may be indented less than the indentation of the block. For instance</p>
<p><code>sophia
contract Layout =
function foo() = 0 // no layout
function bar() = // layout block starts on next line
let x = foo() // indented more than 2 spaces
x
+ 1 // the '+' is indented more than the 'x'</code></p>
<div class="highlight"><pre><span></span><code><span class="k">contract</span><span class="w"> </span><span class="nf">Layout</span><span class="w"> </span><span class="ow">=</span><span class="w"></span>
<span class="w"> </span><span class="k">function</span><span class="w"> </span><span class="n">foo</span><span class="p">()</span><span class="w"> </span><span class="ow">=</span><span class="w"> </span><span class="mi">0</span><span class="w"> </span><span class="c1">// no layout</span>
<span class="w"> </span><span class="k">function</span><span class="w"> </span><span class="n">bar</span><span class="p">()</span><span class="w"> </span><span class="ow">=</span><span class="w"> </span><span class="c1">// layout block starts on next line</span>
<span class="w"> </span><span class="k">let</span><span class="w"> </span><span class="n">x</span><span class="w"> </span><span class="ow">=</span><span class="w"> </span><span class="n">foo</span><span class="p">()</span><span class="w"> </span><span class="c1">// indented more than 2 spaces</span>
<span class="w"> </span><span class="n">x</span><span class="w"></span>
<span class="w"> </span><span class="ow">+</span><span class="w"> </span><span class="mi">1</span><span class="w"> </span><span class="c1">// the &#39;+&#39; is indented more than the &#39;x&#39;</span>
</code></pre></div>
<h2 id="notation">Notation</h2>
<p>In describing the syntax below, we use the following conventions:</p>
<ul>
@@ -666,122 +686,131 @@ contract Layout =
</ul>
<h2 id="declarations">Declarations</h2>
<p>A Sophia file consists of a sequence of <em>declarations</em> in a layout block.</p>
<p>```c
File ::= Block(TopDecl)</p>
<p>TopDecl ::= ['payable'] 'contract' Con '=' Block(Decl)
| 'namespace' Con '=' Block(Decl)
| '@compiler' PragmaOp Version
| 'include' String</p>
<p>Decl ::= 'type' Id ['(' TVar<em> ')'] '=' TypeAlias
| 'record' Id ['(' TVar</em> ')'] '=' RecordType
| 'datatype' Id ['(' TVar<em> ')'] '=' DataType
| (EModifier</em> 'entrypoint' | FModifier* 'function') Block(FunDecl)</p>
<p>FunDecl ::= Id ':' Type // Type signature
| Id Args [':' Type] '=' Block(Stmt) // Definition</p>
<p>PragmaOp ::= '&lt;' | '=&lt;' | '==' | '&gt;=' | '&gt;'
Version ::= Sep1(Int, '.')</p>
<p>EModifier ::= 'payable' | 'stateful'
FModifier ::= 'stateful' | 'private'</p>
<p>Args ::= '(' Sep(Pattern, ',') ')'
```</p>
<div class="highlight"><pre><span></span><code><span class="n">File</span><span class="w"> </span><span class="o">::=</span><span class="w"> </span><span class="n">Block</span><span class="p">(</span><span class="n">TopDecl</span><span class="p">)</span><span class="w"></span>
<span class="n">TopDecl</span><span class="w"> </span><span class="o">::=</span><span class="w"> </span><span class="p">[</span><span class="err">&#39;</span><span class="n">payable</span><span class="err">&#39;</span><span class="p">]</span><span class="w"> </span><span class="err">&#39;</span><span class="n">contract</span><span class="err">&#39;</span><span class="w"> </span><span class="n">Con</span><span class="w"> </span><span class="sc">&#39;=&#39;</span><span class="w"> </span><span class="n">Block</span><span class="p">(</span><span class="n">Decl</span><span class="p">)</span><span class="w"></span>
<span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="err">&#39;</span><span class="n">namespace</span><span class="err">&#39;</span><span class="w"> </span><span class="n">Con</span><span class="w"> </span><span class="sc">&#39;=&#39;</span><span class="w"> </span><span class="n">Block</span><span class="p">(</span><span class="n">Decl</span><span class="p">)</span><span class="w"></span>
<span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="err">&#39;@</span><span class="n">compiler</span><span class="err">&#39;</span><span class="w"> </span><span class="n">PragmaOp</span><span class="w"> </span><span class="n">Version</span><span class="w"></span>
<span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="err">&#39;</span><span class="n">include</span><span class="err">&#39;</span><span class="w"> </span><span class="n">String</span><span class="w"></span>
<span class="n">Decl</span><span class="w"> </span><span class="o">::=</span><span class="w"> </span><span class="err">&#39;</span><span class="n">type</span><span class="err">&#39;</span><span class="w"> </span><span class="n">Id</span><span class="w"> </span><span class="p">[</span><span class="sc">&#39;(&#39;</span><span class="w"> </span><span class="n">TVar</span><span class="o">*</span><span class="w"> </span><span class="sc">&#39;)&#39;</span><span class="p">]</span><span class="w"> </span><span class="sc">&#39;=&#39;</span><span class="w"> </span><span class="n">TypeAlias</span><span class="w"></span>
<span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="err">&#39;</span><span class="n">record</span><span class="err">&#39;</span><span class="w"> </span><span class="n">Id</span><span class="w"> </span><span class="p">[</span><span class="sc">&#39;(&#39;</span><span class="w"> </span><span class="n">TVar</span><span class="o">*</span><span class="w"> </span><span class="sc">&#39;)&#39;</span><span class="p">]</span><span class="w"> </span><span class="sc">&#39;=&#39;</span><span class="w"> </span><span class="n">RecordType</span><span class="w"></span>
<span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="err">&#39;</span><span class="n">datatype</span><span class="err">&#39;</span><span class="w"> </span><span class="n">Id</span><span class="w"> </span><span class="p">[</span><span class="sc">&#39;(&#39;</span><span class="w"> </span><span class="n">TVar</span><span class="o">*</span><span class="w"> </span><span class="sc">&#39;)&#39;</span><span class="p">]</span><span class="w"> </span><span class="sc">&#39;=&#39;</span><span class="w"> </span><span class="n">DataType</span><span class="w"></span>
<span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="p">(</span><span class="n">EModifier</span><span class="o">*</span><span class="w"> </span><span class="err">&#39;</span><span class="n">entrypoint</span><span class="err">&#39;</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">FModifier</span><span class="o">*</span><span class="w"> </span><span class="err">&#39;</span><span class="n">function</span><span class="err">&#39;</span><span class="p">)</span><span class="w"> </span><span class="n">Block</span><span class="p">(</span><span class="n">FunDecl</span><span class="p">)</span><span class="w"></span>
<span class="n">FunDecl</span><span class="w"> </span><span class="o">::=</span><span class="w"> </span><span class="n">Id</span><span class="w"> </span><span class="sc">&#39;:&#39;</span><span class="w"> </span><span class="n">Type</span><span class="w"> </span><span class="c1">// Type signature</span>
<span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">Id</span><span class="w"> </span><span class="n">Args</span><span class="w"> </span><span class="p">[</span><span class="sc">&#39;:&#39;</span><span class="w"> </span><span class="n">Type</span><span class="p">]</span><span class="w"> </span><span class="sc">&#39;=&#39;</span><span class="w"> </span><span class="n">Block</span><span class="p">(</span><span class="n">Stmt</span><span class="p">)</span><span class="w"> </span><span class="c1">// Definition</span>
<span class="n">PragmaOp</span><span class="w"> </span><span class="o">::=</span><span class="w"> </span><span class="sc">&#39;&lt;&#39;</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="err">&#39;</span><span class="o">=&lt;</span><span class="err">&#39;</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="err">&#39;</span><span class="o">==</span><span class="err">&#39;</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="err">&#39;</span><span class="o">&gt;=</span><span class="err">&#39;</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="sc">&#39;&gt;&#39;</span><span class="w"></span>
<span class="n">Version</span><span class="w"> </span><span class="o">::=</span><span class="w"> </span><span class="n">Sep1</span><span class="p">(</span><span class="n">Int</span><span class="p">,</span><span class="w"> </span><span class="sc">&#39;.&#39;</span><span class="p">)</span><span class="w"></span>
<span class="n">EModifier</span><span class="w"> </span><span class="o">::=</span><span class="w"> </span><span class="err">&#39;</span><span class="n">payable</span><span class="err">&#39;</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="err">&#39;</span><span class="n">stateful</span><span class="err">&#39;</span><span class="w"></span>
<span class="n">FModifier</span><span class="w"> </span><span class="o">::=</span><span class="w"> </span><span class="err">&#39;</span><span class="n">stateful</span><span class="err">&#39;</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="err">&#39;</span><span class="n">private</span><span class="err">&#39;</span><span class="w"></span>
<span class="n">Args</span><span class="w"> </span><span class="o">::=</span><span class="w"> </span><span class="sc">&#39;(&#39;</span><span class="w"> </span><span class="n">Sep</span><span class="p">(</span><span class="n">Pattern</span><span class="p">,</span><span class="w"> </span><span class="sc">&#39;,&#39;</span><span class="p">)</span><span class="w"> </span><span class="sc">&#39;)&#39;</span><span class="w"></span>
</code></pre></div>
<p>Contract declarations must appear at the top-level.</p>
<p>For example,
<code>sophia
contract Test =
type t = int
entrypoint add (x : t, y : t) = x + y</code></p>
<div class="highlight"><pre><span></span><code><span class="k">contract</span><span class="w"> </span><span class="nf">Test</span><span class="w"> </span><span class="ow">=</span><span class="w"></span>
<span class="w"> </span><span class="k">type</span><span class="w"> </span><span class="n">t</span><span class="w"> </span><span class="ow">=</span><span class="w"> </span><span class="kt">int</span><span class="w"></span>
<span class="w"> </span><span class="k">entrypoint</span><span class="w"> </span><span class="n">add</span><span class="w"> </span><span class="p">(</span><span class="n">x</span><span class="w"> </span><span class="ow">:</span><span class="w"> </span><span class="n">t</span><span class="p">,</span><span class="w"> </span><span class="n">y</span><span class="w"> </span><span class="ow">:</span><span class="w"> </span><span class="n">t</span><span class="p">)</span><span class="w"> </span><span class="ow">=</span><span class="w"> </span><span class="n">x</span><span class="w"> </span><span class="ow">+</span><span class="w"> </span><span class="n">y</span><span class="w"></span>
</code></pre></div></p>
<p>There are three forms of type declarations: type aliases (declared with the
<code>type</code> keyword), record type definitions (<code>record</code>) and data type definitions
(<code>datatype</code>):</p>
<p>```c
TypeAlias ::= Type
RecordType ::= '{' Sep(FieldType, ',') '}'
DataType ::= Sep1(ConDecl, '|')</p>
<p>FieldType ::= Id ':' Type
ConDecl ::= Con ['(' Sep1(Type, ',') ')']
```</p>
<div class="highlight"><pre><span></span><code><span class="n">TypeAlias</span><span class="w"> </span><span class="o">::=</span><span class="w"> </span><span class="n">Type</span><span class="w"></span>
<span class="n">RecordType</span><span class="w"> </span><span class="o">::=</span><span class="w"> </span><span class="sc">&#39;{&#39;</span><span class="w"> </span><span class="n">Sep</span><span class="p">(</span><span class="n">FieldType</span><span class="p">,</span><span class="w"> </span><span class="sc">&#39;,&#39;</span><span class="p">)</span><span class="w"> </span><span class="sc">&#39;}&#39;</span><span class="w"></span>
<span class="n">DataType</span><span class="w"> </span><span class="o">::=</span><span class="w"> </span><span class="n">Sep1</span><span class="p">(</span><span class="n">ConDecl</span><span class="p">,</span><span class="w"> </span><span class="sc">&#39;|&#39;</span><span class="p">)</span><span class="w"></span>
<span class="n">FieldType</span><span class="w"> </span><span class="o">::=</span><span class="w"> </span><span class="n">Id</span><span class="w"> </span><span class="sc">&#39;:&#39;</span><span class="w"> </span><span class="n">Type</span><span class="w"></span>
<span class="n">ConDecl</span><span class="w"> </span><span class="o">::=</span><span class="w"> </span><span class="n">Con</span><span class="w"> </span><span class="p">[</span><span class="sc">&#39;(&#39;</span><span class="w"> </span><span class="n">Sep1</span><span class="p">(</span><span class="n">Type</span><span class="p">,</span><span class="w"> </span><span class="sc">&#39;,&#39;</span><span class="p">)</span><span class="w"> </span><span class="sc">&#39;)&#39;</span><span class="p">]</span><span class="w"></span>
</code></pre></div>
<p>For example,
<code>sophia
record point('a) = {x : 'a, y : 'a}
datatype shape('a) = Circle(point('a), 'a) | Rect(point('a), point('a))
type int_shape = shape(int)</code></p>
<div class="highlight"><pre><span></span><code><span class="k">record</span><span class="w"> </span><span class="n">point</span><span class="p">(</span><span class="nv">&#39;a</span><span class="p">)</span><span class="w"> </span><span class="ow">=</span><span class="w"> </span><span class="p">{</span><span class="n">x</span><span class="w"> </span><span class="ow">:</span><span class="w"> </span><span class="nv">&#39;a</span><span class="p">,</span><span class="w"> </span><span class="n">y</span><span class="w"> </span><span class="ow">:</span><span class="w"> </span><span class="nv">&#39;a</span><span class="p">}</span><span class="w"></span>
<span class="k">datatype</span><span class="w"> </span><span class="n">shape</span><span class="p">(</span><span class="nv">&#39;a</span><span class="p">)</span><span class="w"> </span><span class="ow">=</span><span class="w"> </span><span class="nf">Circle</span><span class="p">(</span><span class="n">point</span><span class="p">(</span><span class="nv">&#39;a</span><span class="p">),</span><span class="w"> </span><span class="nv">&#39;a</span><span class="p">)</span><span class="w"> </span><span class="ow">|</span><span class="w"> </span><span class="nf">Rect</span><span class="p">(</span><span class="n">point</span><span class="p">(</span><span class="nv">&#39;a</span><span class="p">),</span><span class="w"> </span><span class="n">point</span><span class="p">(</span><span class="nv">&#39;a</span><span class="p">))</span><span class="w"></span>
<span class="k">type</span><span class="w"> </span><span class="n">int_shape</span><span class="w"> </span><span class="ow">=</span><span class="w"> </span><span class="n">shape</span><span class="p">(</span><span class="kt">int</span><span class="p">)</span><span class="w"></span>
</code></pre></div></p>
<h2 id="types">Types</h2>
<p>```c
Type ::= Domain '=&gt;' Type // Function type
| Type '(' Sep(Type, ',') ')' // Type application
| '(' Type ')' // Parens
| 'unit' | Sep(Type, '*') // Tuples
| Id | QId | TVar</p>
<p>Domain ::= Type // Single argument
| '(' Sep(Type, ',') ')' // Multiple arguments
```</p>
<div class="highlight"><pre><span></span><code><span class="n">Type</span><span class="w"> </span><span class="o">::=</span><span class="w"> </span><span class="n">Domain</span><span class="w"> </span><span class="err">&#39;</span><span class="o">=&gt;</span><span class="err">&#39;</span><span class="w"> </span><span class="n">Type</span><span class="w"> </span><span class="c1">// Function type</span>
<span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">Type</span><span class="w"> </span><span class="sc">&#39;(&#39;</span><span class="w"> </span><span class="n">Sep</span><span class="p">(</span><span class="n">Type</span><span class="p">,</span><span class="w"> </span><span class="sc">&#39;,&#39;</span><span class="p">)</span><span class="w"> </span><span class="sc">&#39;)&#39;</span><span class="w"> </span><span class="c1">// Type application</span>
<span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="sc">&#39;(&#39;</span><span class="w"> </span><span class="n">Type</span><span class="w"> </span><span class="sc">&#39;)&#39;</span><span class="w"> </span><span class="c1">// Parens</span>
<span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="err">&#39;</span><span class="n">unit</span><span class="err">&#39;</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">Sep</span><span class="p">(</span><span class="n">Type</span><span class="p">,</span><span class="w"> </span><span class="sc">&#39;*&#39;</span><span class="p">)</span><span class="w"> </span><span class="c1">// Tuples</span>
<span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">Id</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">QId</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">TVar</span><span class="w"></span>
<span class="n">Domain</span><span class="w"> </span><span class="o">::=</span><span class="w"> </span><span class="n">Type</span><span class="w"> </span><span class="c1">// Single argument</span>
<span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="sc">&#39;(&#39;</span><span class="w"> </span><span class="n">Sep</span><span class="p">(</span><span class="n">Type</span><span class="p">,</span><span class="w"> </span><span class="sc">&#39;,&#39;</span><span class="p">)</span><span class="w"> </span><span class="sc">&#39;)&#39;</span><span class="w"> </span><span class="c1">// Multiple arguments</span>
</code></pre></div>
<p>The function type arrow associates to the right.</p>
<p>Example,
<code>sophia
'a =&gt; list('a) =&gt; (int * list('a))</code></p>
<div class="highlight"><pre><span></span><code><span class="nv">&#39;a</span><span class="w"> </span><span class="ow">=&gt;</span><span class="w"> </span><span class="kt">list</span><span class="p">(</span><span class="nv">&#39;a</span><span class="p">)</span><span class="w"> </span><span class="ow">=&gt;</span><span class="w"> </span><span class="p">(</span><span class="kt">int</span><span class="w"> </span><span class="ow">*</span><span class="w"> </span><span class="kt">list</span><span class="p">(</span><span class="nv">&#39;a</span><span class="p">))</span><span class="w"></span>
</code></pre></div></p>
<h2 id="statements">Statements</h2>
<p>Function bodies are blocks of <em>statements</em>, where a statement is one of the following</p>
<p>```c
Stmt ::= 'switch' '(' Expr ')' Block(Case)
| 'if' '(' Expr ')' Block(Stmt)
| 'elif' '(' Expr ')' Block(Stmt)
| 'else' Block(Stmt)
| 'let' LetDef
| Expr</p>
<p>LetDef ::= Id Args [':' Type] '=' Block(Stmt) // Function definition
| Pattern '=' Block(Stmt) // Value definition</p>
<p>Case ::= Pattern '=&gt;' Block(Stmt)
Pattern ::= Expr
```</p>
<div class="highlight"><pre><span></span><code><span class="n">Stmt</span><span class="w"> </span><span class="o">::=</span><span class="w"> </span><span class="err">&#39;</span><span class="k">switch</span><span class="sc">&#39; &#39;</span><span class="p">(</span><span class="err">&#39;</span><span class="w"> </span><span class="n">Expr</span><span class="w"> </span><span class="sc">&#39;)&#39;</span><span class="w"> </span><span class="n">Block</span><span class="p">(</span><span class="n">Case</span><span class="p">)</span><span class="w"></span>
<span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="err">&#39;</span><span class="k">if</span><span class="sc">&#39; &#39;</span><span class="p">(</span><span class="err">&#39;</span><span class="w"> </span><span class="n">Expr</span><span class="w"> </span><span class="sc">&#39;)&#39;</span><span class="w"> </span><span class="n">Block</span><span class="p">(</span><span class="n">Stmt</span><span class="p">)</span><span class="w"></span>
<span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="err">&#39;</span><span class="n">elif</span><span class="sc">&#39; &#39;</span><span class="p">(</span><span class="err">&#39;</span><span class="w"> </span><span class="n">Expr</span><span class="w"> </span><span class="sc">&#39;)&#39;</span><span class="w"> </span><span class="n">Block</span><span class="p">(</span><span class="n">Stmt</span><span class="p">)</span><span class="w"></span>
<span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="err">&#39;</span><span class="k">else</span><span class="err">&#39;</span><span class="w"> </span><span class="n">Block</span><span class="p">(</span><span class="n">Stmt</span><span class="p">)</span><span class="w"></span>
<span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="err">&#39;</span><span class="n">let</span><span class="err">&#39;</span><span class="w"> </span><span class="n">LetDef</span><span class="w"></span>
<span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">Expr</span><span class="w"></span>
<span class="n">LetDef</span><span class="w"> </span><span class="o">::=</span><span class="w"> </span><span class="n">Id</span><span class="w"> </span><span class="n">Args</span><span class="w"> </span><span class="p">[</span><span class="sc">&#39;:&#39;</span><span class="w"> </span><span class="n">Type</span><span class="p">]</span><span class="w"> </span><span class="sc">&#39;=&#39;</span><span class="w"> </span><span class="n">Block</span><span class="p">(</span><span class="n">Stmt</span><span class="p">)</span><span class="w"> </span><span class="c1">// Function definition</span>
<span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">Pattern</span><span class="w"> </span><span class="sc">&#39;=&#39;</span><span class="w"> </span><span class="n">Block</span><span class="p">(</span><span class="n">Stmt</span><span class="p">)</span><span class="w"> </span><span class="c1">// Value definition</span>
<span class="n">Case</span><span class="w"> </span><span class="o">::=</span><span class="w"> </span><span class="n">Pattern</span><span class="w"> </span><span class="err">&#39;</span><span class="o">=&gt;</span><span class="err">&#39;</span><span class="w"> </span><span class="n">Block</span><span class="p">(</span><span class="n">Stmt</span><span class="p">)</span><span class="w"></span>
<span class="n">Pattern</span><span class="w"> </span><span class="o">::=</span><span class="w"> </span><span class="n">Expr</span><span class="w"></span>
</code></pre></div>
<p><code>if</code> statements can be followed by zero or more <code>elif</code> statements and an optional final <code>else</code> statement. For example,</p>
<p><code>sophia
let x : int = 4
switch(f(x))
None =&gt; 0
Some(y) =&gt;
if(y &gt; 10)
"too big"
elif(y &lt; 3)
"too small"
else
"just right"</code></p>
<div class="highlight"><pre><span></span><code><span class="k">let</span><span class="w"> </span><span class="n">x</span><span class="w"> </span><span class="ow">:</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="ow">=</span><span class="w"> </span><span class="mi">4</span><span class="w"></span>
<span class="k">switch</span><span class="p">(</span><span class="n">f</span><span class="p">(</span><span class="n">x</span><span class="p">))</span><span class="w"></span>
<span class="w"> </span><span class="nf">None</span><span class="w"> </span><span class="ow">=&gt;</span><span class="w"> </span><span class="mi">0</span><span class="w"></span>
<span class="w"> </span><span class="nf">Some</span><span class="p">(</span><span class="n">y</span><span class="p">)</span><span class="w"> </span><span class="ow">=&gt;</span><span class="w"></span>
<span class="w"> </span><span class="k">if</span><span class="p">(</span><span class="n">y</span><span class="w"> </span><span class="ow">&gt;</span><span class="w"> </span><span class="mi">10</span><span class="p">)</span><span class="w"></span>
<span class="w"> </span><span class="s2">&quot;too big&quot;</span><span class="w"></span>
<span class="w"> </span><span class="k">elif</span><span class="p">(</span><span class="n">y</span><span class="w"> </span><span class="ow">&lt;</span><span class="w"> </span><span class="mi">3</span><span class="p">)</span><span class="w"></span>
<span class="w"> </span><span class="s2">&quot;too small&quot;</span><span class="w"></span>
<span class="w"> </span><span class="k">else</span><span class="w"></span>
<span class="w"> </span><span class="s2">&quot;just right&quot;</span><span class="w"></span>
</code></pre></div>
<h2 id="expressions">Expressions</h2>
<p>```c
Expr ::= '(' LamArgs ')' '=&gt;' Block(Stmt) // Anonymous function (x) =&gt; x + 1
| '(' BinOp ')' // Operator lambda (+)
| 'if' '(' Expr ')' Expr 'else' Expr // If expression if(x &lt; y) y else x
| Expr ':' Type // Type annotation 5 : int
| Expr BinOp Expr // Binary operator x + y
| UnOp Expr // Unary operator ! b
| Expr '(' Sep(Expr, ',') ')' // Application f(x, y)
| Expr '.' Id // Projection state.x
| Expr '[' Expr ']' // Map lookup map[key]
| Expr '{' Sep(FieldUpdate, ',') '}' // Record or map update r{ fld[key].x = y }
| '[' Sep(Expr, ',') ']' // List [1, 2, 3]
| '[' Expr '|' Sep(Generator, ',') ']'
// List comprehension [k | x &lt;- [1], if (f(x)), let k = x+1]
| '[' Expr '..' Expr ']' // List range [1..n]
| '{' Sep(FieldUpdate, ',') '}' // Record or map value {x = 0, y = 1}, {[key] = val}
| '(' Expr ')' // Parens (1 + 2) * 3
| Id | Con | QId | QCon // Identifiers x, None, Map.member, AELib.Token
| Int | Bytes | String | Char // Literals 123, 0xff, #00abc123, "foo", '%'
| AccountAddress | ContractAddress // Chain identifiers
| OracleAddress | OracleQueryId // Chain identifiers</p>
<p>Generator ::= Pattern '&lt;-' Expr // Generator
| 'if' '(' Expr ')' // Guard
| LetDef // Definition</p>
<p>LamArgs ::= '(' Sep(LamArg, ',') ')'
LamArg ::= Id [':' Type]</p>
<p>FieldUpdate ::= Path '=' Expr
Path ::= Id // Record field
| '[' Expr ']' // Map key
| Path '.' Id // Nested record field
| Path '[' Expr ']' // Nested map key</p>
<p>BinOp ::= '||' | '&amp;&amp;' | '&lt;' | '&gt;' | '=&lt;' | '&gt;=' | '==' | '!='
| '::' | '++' | '+' | '-' | '*' | '/' | 'mod' | '^'
| '|&gt;'
UnOp ::= '-' | '!'
```</p>
<div class="highlight"><pre><span></span><code><span class="n">Expr</span><span class="w"> </span><span class="o">::=</span><span class="w"> </span><span class="sc">&#39;(&#39;</span><span class="w"> </span><span class="n">LamArgs</span><span class="w"> </span><span class="sc">&#39;)&#39;</span><span class="w"> </span><span class="err">&#39;</span><span class="o">=&gt;</span><span class="err">&#39;</span><span class="w"> </span><span class="n">Block</span><span class="p">(</span><span class="n">Stmt</span><span class="p">)</span><span class="w"> </span><span class="c1">// Anonymous function (x) =&gt; x + 1</span>
<span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="sc">&#39;(&#39;</span><span class="w"> </span><span class="n">BinOp</span><span class="w"> </span><span class="sc">&#39;)&#39;</span><span class="w"> </span><span class="c1">// Operator lambda (+)</span>
<span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="err">&#39;</span><span class="k">if</span><span class="sc">&#39; &#39;</span><span class="p">(</span><span class="err">&#39;</span><span class="w"> </span><span class="n">Expr</span><span class="w"> </span><span class="sc">&#39;)&#39;</span><span class="w"> </span><span class="n">Expr</span><span class="w"> </span><span class="err">&#39;</span><span class="k">else</span><span class="err">&#39;</span><span class="w"> </span><span class="n">Expr</span><span class="w"> </span><span class="c1">// If expression if(x &lt; y) y else x</span>
<span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">Expr</span><span class="w"> </span><span class="sc">&#39;:&#39;</span><span class="w"> </span><span class="n">Type</span><span class="w"> </span><span class="c1">// Type annotation 5 : int</span>
<span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">Expr</span><span class="w"> </span><span class="n">BinOp</span><span class="w"> </span><span class="n">Expr</span><span class="w"> </span><span class="c1">// Binary operator x + y</span>
<span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">UnOp</span><span class="w"> </span><span class="n">Expr</span><span class="w"> </span><span class="c1">// Unary operator ! b</span>
<span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">Expr</span><span class="w"> </span><span class="sc">&#39;(&#39;</span><span class="w"> </span><span class="n">Sep</span><span class="p">(</span><span class="n">Expr</span><span class="p">,</span><span class="w"> </span><span class="sc">&#39;,&#39;</span><span class="p">)</span><span class="w"> </span><span class="sc">&#39;)&#39;</span><span class="w"> </span><span class="c1">// Application f(x, y)</span>
<span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">Expr</span><span class="w"> </span><span class="sc">&#39;.&#39;</span><span class="w"> </span><span class="n">Id</span><span class="w"> </span><span class="c1">// Projection state.x</span>
<span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">Expr</span><span class="w"> </span><span class="sc">&#39;[&#39;</span><span class="w"> </span><span class="n">Expr</span><span class="w"> </span><span class="sc">&#39;]&#39;</span><span class="w"> </span><span class="c1">// Map lookup map[key]</span>
<span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">Expr</span><span class="w"> </span><span class="sc">&#39;{&#39;</span><span class="w"> </span><span class="n">Sep</span><span class="p">(</span><span class="n">FieldUpdate</span><span class="p">,</span><span class="w"> </span><span class="sc">&#39;,&#39;</span><span class="p">)</span><span class="w"> </span><span class="sc">&#39;}&#39;</span><span class="w"> </span><span class="c1">// Record or map update r{ fld[key].x = y }</span>
<span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="sc">&#39;[&#39;</span><span class="w"> </span><span class="n">Sep</span><span class="p">(</span><span class="n">Expr</span><span class="p">,</span><span class="w"> </span><span class="sc">&#39;,&#39;</span><span class="p">)</span><span class="w"> </span><span class="sc">&#39;]&#39;</span><span class="w"> </span><span class="c1">// List [1, 2, 3]</span>
<span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="sc">&#39;[&#39;</span><span class="w"> </span><span class="n">Expr</span><span class="w"> </span><span class="sc">&#39;|&#39;</span><span class="w"> </span><span class="n">Sep</span><span class="p">(</span><span class="n">Generator</span><span class="p">,</span><span class="w"> </span><span class="sc">&#39;,&#39;</span><span class="p">)</span><span class="w"> </span><span class="sc">&#39;]&#39;</span><span class="w"></span>
<span class="w"> </span><span class="c1">// List comprehension [k | x &lt;- [1], if (f(x)), let k = x+1]</span>
<span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="sc">&#39;[&#39;</span><span class="w"> </span><span class="n">Expr</span><span class="w"> </span><span class="err">&#39;</span><span class="p">..</span><span class="err">&#39;</span><span class="w"> </span><span class="n">Expr</span><span class="w"> </span><span class="sc">&#39;]&#39;</span><span class="w"> </span><span class="c1">// List range [1..n]</span>
<span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="sc">&#39;{&#39;</span><span class="w"> </span><span class="n">Sep</span><span class="p">(</span><span class="n">FieldUpdate</span><span class="p">,</span><span class="w"> </span><span class="sc">&#39;,&#39;</span><span class="p">)</span><span class="w"> </span><span class="sc">&#39;}&#39;</span><span class="w"> </span><span class="c1">// Record or map value {x = 0, y = 1}, {[key] = val}</span>
<span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="sc">&#39;(&#39;</span><span class="w"> </span><span class="n">Expr</span><span class="w"> </span><span class="sc">&#39;)&#39;</span><span class="w"> </span><span class="c1">// Parens (1 + 2) * 3</span>
<span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">Id</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">Con</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">QId</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">QCon</span><span class="w"> </span><span class="c1">// Identifiers x, None, Map.member, AELib.Token</span>
<span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">Int</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">Bytes</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">String</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">Char</span><span class="w"> </span><span class="c1">// Literals 123, 0xff, #00abc123, &quot;foo&quot;, &#39;%&#39;</span>
<span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">AccountAddress</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">ContractAddress</span><span class="w"> </span><span class="c1">// Chain identifiers</span>
<span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">OracleAddress</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">OracleQueryId</span><span class="w"> </span><span class="c1">// Chain identifiers</span>
<span class="n">Generator</span><span class="w"> </span><span class="o">::=</span><span class="w"> </span><span class="n">Pattern</span><span class="w"> </span><span class="err">&#39;</span><span class="o">&lt;-</span><span class="err">&#39;</span><span class="w"> </span><span class="n">Expr</span><span class="w"> </span><span class="c1">// Generator</span>
<span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="err">&#39;</span><span class="k">if</span><span class="sc">&#39; &#39;</span><span class="p">(</span><span class="err">&#39;</span><span class="w"> </span><span class="n">Expr</span><span class="w"> </span><span class="sc">&#39;)&#39;</span><span class="w"> </span><span class="c1">// Guard</span>
<span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">LetDef</span><span class="w"> </span><span class="c1">// Definition</span>
<span class="n">LamArgs</span><span class="w"> </span><span class="o">::=</span><span class="w"> </span><span class="sc">&#39;(&#39;</span><span class="w"> </span><span class="n">Sep</span><span class="p">(</span><span class="n">LamArg</span><span class="p">,</span><span class="w"> </span><span class="sc">&#39;,&#39;</span><span class="p">)</span><span class="w"> </span><span class="sc">&#39;)&#39;</span><span class="w"></span>
<span class="n">LamArg</span><span class="w"> </span><span class="o">::=</span><span class="w"> </span><span class="n">Id</span><span class="w"> </span><span class="p">[</span><span class="sc">&#39;:&#39;</span><span class="w"> </span><span class="n">Type</span><span class="p">]</span><span class="w"></span>
<span class="n">FieldUpdate</span><span class="w"> </span><span class="o">::=</span><span class="w"> </span><span class="n">Path</span><span class="w"> </span><span class="sc">&#39;=&#39;</span><span class="w"> </span><span class="n">Expr</span><span class="w"></span>
<span class="n">Path</span><span class="w"> </span><span class="o">::=</span><span class="w"> </span><span class="n">Id</span><span class="w"> </span><span class="c1">// Record field</span>
<span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="sc">&#39;[&#39;</span><span class="w"> </span><span class="n">Expr</span><span class="w"> </span><span class="sc">&#39;]&#39;</span><span class="w"> </span><span class="c1">// Map key</span>
<span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">Path</span><span class="w"> </span><span class="sc">&#39;.&#39;</span><span class="w"> </span><span class="n">Id</span><span class="w"> </span><span class="c1">// Nested record field</span>
<span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">Path</span><span class="w"> </span><span class="sc">&#39;[&#39;</span><span class="w"> </span><span class="n">Expr</span><span class="w"> </span><span class="sc">&#39;]&#39;</span><span class="w"> </span><span class="c1">// Nested map key</span>
<span class="n">BinOp</span><span class="w"> </span><span class="o">::=</span><span class="w"> </span><span class="err">&#39;</span><span class="o">||</span><span class="err">&#39;</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="err">&#39;</span><span class="o">&amp;&amp;</span><span class="err">&#39;</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="sc">&#39;&lt;&#39;</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="sc">&#39;&gt;&#39;</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="err">&#39;</span><span class="o">=&lt;</span><span class="err">&#39;</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="err">&#39;</span><span class="o">&gt;=</span><span class="err">&#39;</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="err">&#39;</span><span class="o">==</span><span class="err">&#39;</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="err">&#39;</span><span class="o">!=</span><span class="err">&#39;</span><span class="w"></span>
<span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="err">&#39;</span><span class="o">::</span><span class="err">&#39;</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="err">&#39;</span><span class="o">++</span><span class="err">&#39;</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="sc">&#39;+&#39;</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="sc">&#39;-&#39;</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="sc">&#39;*&#39;</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="sc">&#39;/&#39;</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="err">&#39;</span><span class="n">mod</span><span class="err">&#39;</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="sc">&#39;^&#39;</span><span class="w"></span>
<span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="err">&#39;</span><span class="o">|&gt;</span><span class="err">&#39;</span><span class="w"></span>
<span class="n">UnOp</span><span class="w"> </span><span class="o">::=</span><span class="w"> </span><span class="sc">&#39;-&#39;</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="sc">&#39;!&#39;</span><span class="w"></span>
</code></pre></div>
<h2 id="operators-types">Operators types</h2>
<table>
<thead>
@@ -920,10 +949,12 @@ UnOp ::= '-' | '!'
<div class="md-footer-meta__inner md-grid">
<div class="md-footer-copyright">
Made with
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@@ -935,10 +966,10 @@ UnOp ::= '-' | '!'
<div class="md-dialog" data-md-component="dialog">
<div class="md-dialog__inner md-typeset"></div>
</div>
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