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Primitives
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String
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Number
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Path
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Boolean
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<h1 id="data-types">Data Types</h1>
<h2 id="primitives">Primitives</h2>
<h3 id="type-string">String</h3>
<p><em>Strings</em> can be written in three ways.</p>
<p>The most common way is to enclose the string between double quotes,
e.g., <code>"foo bar"</code>. Strings can span multiple lines. The special
characters <code>"</code> and <code>and the character sequence `${` must be
escaped by prefixing them with a backslash (</code>). Newlines, carriage
returns and tabs can be written as <code>n</code>, <code>r</code> and <code>t</code>,
respectively.</p>
<p>You can include the results of other expressions into a string by enclosing them in <code>${ }</code>, a feature known as <a href="../string-interpolation/">string interpolation</a>.</p>
<p>The second way to write string literals is as an <em>indented string</em>,
which is enclosed between pairs of <em>double single-quotes</em>, like so:</p>
<div class="highlight"><pre><span></span><code><span class="s s-Multiline">&#39;&#39;</span>
<span class="s s-Multiline"> This is the first line.</span>
<span class="s s-Multiline"> This is the second line.</span>
<span class="s s-Multiline"> This is the third line.</span>
<span class="s s-Multiline">&#39;&#39;</span>
</code></pre></div>
<p>This kind of string literal intelligently strips indentation from
the start of each line. To be precise, it strips from each line a
number of spaces equal to the minimal indentation of the string as a
whole (disregarding the indentation of empty lines). For instance,
the first and second line are indented two spaces, while the third
line is indented four spaces. Thus, two spaces are stripped from
each line, so the resulting string is</p>
<div class="highlight"><pre><span></span><code><span class="s2">&quot;This is the first line.nThis is the second line.n This is the third line.n&quot;</span>
</code></pre></div>
<p>Note that the whitespace and newline following the opening <code>''</code> is
ignored if there is no non-whitespace text on the initial line.</p>
<p>Indented strings support <a href="../string-interpolation/">string interpolation</a>.</p>
<p>Since <code>${</code> and <code>''</code> have special meaning in indented strings, you
need a way to quote them. <code>$</code> can be escaped by prefixing it with
<code>''</code> (that is, two single quotes), i.e., <code>''$</code>. <code>''</code> can be escaped
by prefixing it with <code>'</code>, i.e., <code>'''</code>. <code>$</code> removes any special
meaning from the following <code>$</code>. Linefeed, carriage-return and tab
characters can be written as <code>''n</code>, <code>''r</code>, <code>''t</code>, and <code>''</code>
escapes any other character.</p>
<p>Indented strings are primarily useful in that they allow multi-line
string literals to follow the indentation of the enclosing Nix
expression, and that less escaping is typically necessary for
strings representing languages such as shell scripts and
configuration files because <code>''</code> is much less common than <code>"</code>.
Example:</p>
<div class="highlight"><pre><span></span><code>stdenv<span class="o">.</span>mkDerivation <span class="p">{</span>
<span class="o">...</span>
<span class="ss">postInstall</span> <span class="o">=</span>
<span class="s s-Multiline">&#39;&#39;</span>
<span class="s s-Multiline"> mkdir $out/bin $out/etc</span>
<span class="s s-Multiline"> cp foo $out/bin</span>
<span class="s s-Multiline"> echo &quot;Hello World&quot; &gt; $out/etc/foo.conf</span>
<span class="s s-Multiline"> </span><span class="si">${</span><span class="k">if</span> enableBar <span class="k">then</span> <span class="s2">&quot;cp bar $out/bin&quot;</span> <span class="k">else</span> <span class="s2">&quot;&quot;</span><span class="si">}</span>
<span class="s s-Multiline"> &#39;&#39;</span><span class="p">;</span>
<span class="o">...</span>
<span class="p">}</span>
</code></pre></div>
<p>Finally, as a convenience, <em>URIs</em> as defined in appendix B of
<a href="http://www.ietf.org/rfc/rfc2396.txt">RFC 2396</a> can be written <em>as
is</em>, without quotes. For instance, the string
<code>"http://example.org/foo.tar.bz2"</code> can also be written as
<code>http://example.org/foo.tar.bz2</code>.</p>
<h3 id="type-number">Number</h3>
<p>Numbers, which can be <em>integers</em> (like <code>123</code>) or <em>floating point</em>
(like <code>123.43</code> or <code>.27e13</code>).</p>
<p>See <a href="../operators/#arithmetic">arithmetic</a> and <a href="../operators/#comparison">comparison</a> operators for semantics.</p>
<h3 id="type-path">Path</h3>
<p><em>Paths</em>, e.g., <code>/bin/sh</code> or <code>./builder.sh</code>. A path must contain at
least one slash to be recognised as such. For instance, <code>builder.sh</code>
is not a path: it's parsed as an expression that selects the
attribute <code>sh</code> from the variable <code>builder</code>. If the file name is
relative, i.e., if it does not begin with a slash, it is made
absolute at parse time relative to the directory of the Nix
expression that contained it. For instance, if a Nix expression in
<code>/foo/bar/bla.nix</code> refers to <code>../xyzzy/fnord.nix</code>, the absolute path
is <code>/foo/xyzzy/fnord.nix</code>.</p>
<p>If the first component of a path is a <code>~</code>, it is interpreted as if
the rest of the path were relative to the user's home directory.
e.g. <code>~/foo</code> would be equivalent to <code>/home/edolstra/foo</code> for a user
whose home directory is <code>/home/edolstra</code>.</p>
<p>Paths can also be specified between angle brackets, e.g.
<code>&lt;nixpkgs&gt;</code>. This means that the directories listed in the
environment variable <code>NIX_PATH</code> will be searched for the given file
or directory name.</p>
<p>When an <a href="../string-interpolation/">interpolated string</a> evaluates to a path, the path is first copied into the Nix store and the resulting string is the <a href="../../glossary/#gloss-store-path">store path</a> of the newly created <a href="../../glossary/#gloss-store-object">store object</a>.</p>
<p>For instance, evaluating <code>"${./foo.txt}"</code> will cause <code>foo.txt</code> in the current directory to be copied into the Nix store and result in the string <code>"/nix/store/&lt;hash&gt;-foo.txt"</code>.</p>
<p>Note that the Nix language assumes that all input files will remain <em>unchanged</em> while evaluating a Nix expression.
For example, assume you used a file path in an interpolated string during a <code>nix repl</code> session.
Later in the same session, after having changed the file contents, evaluating the interpolated string with the file path again might not return a new store path, since Nix might not re-read the file contents.</p>
<p>Paths themselves, except those in angle brackets (<code>&lt; &gt;</code>), support <a href="../string-interpolation/">string interpolation</a>.</p>
<p>At least one slash (<code>/</code>) must appear <em>before</em> any interpolated expression for the result to be recognized as a path.</p>
<p><code>a.${foo}/b.${bar}</code> is a syntactically valid division operation.
<code>./a.${foo}/b.${bar}</code> is a path.</p>
<h3 id="type-boolean">Boolean</h3>
<p><em>Booleans</em> with values <code>true</code> and <code>false</code>.</p>
<h3 id="type-null">Null</h3>
<p>The null value, denoted as <code>null</code>.</p>
<h2 id="list">List</h2>
<p>Lists are formed by enclosing a whitespace-separated list of values
between square brackets. For example,</p>
<div class="highlight"><pre><span></span><code><span class="p">[</span> <span class="mi">123</span> <span class="l">./foo.nix</span> <span class="s2">&quot;abc&quot;</span> <span class="p">(</span>f <span class="p">{</span> <span class="ss">x</span> <span class="o">=</span> y<span class="p">;</span> <span class="p">})</span> <span class="p">]</span>
</code></pre></div>
<p>defines a list of four elements, the last being the result of a call to
the function <code>f</code>. Note that function calls have to be enclosed in
parentheses. If they had been omitted, e.g.,</p>
<div class="highlight"><pre><span></span><code><span class="p">[</span> <span class="mi">123</span> <span class="l">./foo.nix</span> <span class="s2">&quot;abc&quot;</span> f <span class="p">{</span> <span class="ss">x</span> <span class="o">=</span> y<span class="p">;</span> <span class="p">}</span> <span class="p">]</span>
</code></pre></div>
<p>the result would be a list of five elements, the fourth one being a
function and the fifth being a set.</p>
<p>Note that lists are only lazy in values, and they are strict in length.</p>
<h2 id="attribute-set">Attribute Set</h2>
<p>An attribute set is a collection of name-value-pairs (called <em>attributes</em>) enclosed in curly brackets (<code>{ }</code>).</p>
<p>An attribute name can be an identifier or a <a href="#string">string</a>.
An identifier must start with a letter (<code>a-z</code>, <code>A-Z</code>) or underscore (<code>_</code>), and can otherwise contain letters (<code>a-z</code>, <code>A-Z</code>), numbers (<code>0-9</code>), underscores (<code>_</code>), apostrophes (<code>'</code>), or dashes (<code>-</code>).</p>
<blockquote>
<p><em>name</em> = <em>identifier</em> | <em>string</em>
<em>identifier</em> ~ <code>[a-zA-Z_][a-zA-Z0-9_'-]*</code></p>
</blockquote>
<p>Names and values are separated by an equal sign (<code>=</code>).
Each value is an arbitrary expression terminated by a semicolon (<code>;</code>).</p>
<blockquote>
<p><em>attrset</em> = <code>{</code> [ <em>name</em> <code>=</code> <em>expr</em> <code>;</code> <code>]</code>... <code>}</code></p>
</blockquote>
<p>Attributes can appear in any order.
An attribute name may only occur once.</p>
<p>Example:</p>
<div class="highlight"><pre><span></span><code><span class="p">{</span>
<span class="ss">x</span> <span class="o">=</span> <span class="mi">123</span><span class="p">;</span>
<span class="ss">text</span> <span class="o">=</span> <span class="s2">&quot;Hello&quot;</span><span class="p">;</span>
<span class="ss">y</span> <span class="o">=</span> f <span class="p">{</span> <span class="ss">bla</span> <span class="o">=</span> <span class="mi">456</span><span class="p">;</span> <span class="p">};</span>
<span class="p">}</span>
</code></pre></div>
<p>This defines a set with attributes named <code>x</code>, <code>text</code>, <code>y</code>.</p>
<p>Attributes can be accessed with the <a href="../operators/#attribute-selection"><code>.</code> operator</a>.</p>
<p>Example:</p>
<div class="highlight"><pre><span></span><code><span class="p">{</span> <span class="ss">a</span> <span class="o">=</span> <span class="s2">&quot;Foo&quot;</span><span class="p">;</span> <span class="ss">b</span> <span class="o">=</span> <span class="s2">&quot;Bar&quot;</span><span class="p">;</span> <span class="p">}</span><span class="o">.</span>a
</code></pre></div>
<p>This evaluates to <code>"Foo"</code>.</p>
<p>It is possible to provide a default value in an attribute selection using the <code>or</code> keyword.</p>
<p>Example:</p>
<div class="highlight"><pre><span></span><code><span class="p">{</span> <span class="ss">a</span> <span class="o">=</span> <span class="s2">&quot;Foo&quot;</span><span class="p">;</span> <span class="ss">b</span> <span class="o">=</span> <span class="s2">&quot;Bar&quot;</span><span class="p">;</span> <span class="p">}</span><span class="o">.</span>c <span class="ow">or</span> <span class="s2">&quot;Xyzzy&quot;</span>
</code></pre></div>
<div class="highlight"><pre><span></span><code><span class="p">{</span> <span class="ss">a</span> <span class="o">=</span> <span class="s2">&quot;Foo&quot;</span><span class="p">;</span> <span class="ss">b</span> <span class="o">=</span> <span class="s2">&quot;Bar&quot;</span><span class="p">;</span> <span class="p">}</span><span class="o">.</span>c<span class="o">.</span>d<span class="o">.</span>e<span class="o">.</span>f<span class="o">.</span>g <span class="ow">or</span> <span class="s2">&quot;Xyzzy&quot;</span>
</code></pre></div>
<p>will both evaluate to <code>"Xyzzy"</code> because there is no <code>c</code> attribute in the set.</p>
<p>You can use arbitrary double-quoted strings as attribute names:</p>
<div class="highlight"><pre><span></span><code><span class="p">{</span> <span class="s2">&quot;$!@#?&quot;</span> <span class="o">=</span> <span class="mi">123</span><span class="p">;</span> <span class="p">}</span><span class="o">.</span><span class="s2">&quot;$!@#?&quot;</span>
</code></pre></div>
<div class="highlight"><pre><span></span><code><span class="k">let</span> <span class="ss">bar</span> <span class="o">=</span> <span class="s2">&quot;bar&quot;</span><span class="p">;</span> <span class="k">in</span>
<span class="p">{</span> <span class="s2">&quot;foo </span><span class="si">${</span>bar<span class="si">}</span><span class="s2">&quot;</span> <span class="o">=</span> <span class="mi">123</span><span class="p">;</span> <span class="p">}</span><span class="o">.</span><span class="s2">&quot;foo </span><span class="si">${</span>bar<span class="si">}</span><span class="s2">&quot;</span>
</code></pre></div>
<p>Both will evaluate to <code>123</code>.</p>
<p>Attribute names support <a href="../string-interpolation/">string interpolation</a>:</p>
<div class="highlight"><pre><span></span><code><span class="k">let</span> <span class="ss">bar</span> <span class="o">=</span> <span class="s2">&quot;foo&quot;</span><span class="p">;</span> <span class="k">in</span>
<span class="p">{</span> <span class="ss">foo</span> <span class="o">=</span> <span class="mi">123</span><span class="p">;</span> <span class="p">}</span><span class="o">.</span><span class="si">${</span>bar<span class="si">}</span>
</code></pre></div>
<div class="highlight"><pre><span></span><code><span class="k">let</span> <span class="ss">bar</span> <span class="o">=</span> <span class="s2">&quot;foo&quot;</span><span class="p">;</span> <span class="k">in</span>
<span class="p">{</span> <span class="si">${</span>bar<span class="si">}</span> <span class="o">=</span> <span class="mi">123</span><span class="p">;</span> <span class="p">}</span><span class="o">.</span>foo
</code></pre></div>
<p>Both will evaluate to <code>123</code>.</p>
<p>In the special case where an attribute name inside of a set declaration
evaluates to <code>null</code> (which is normally an error, as <code>null</code> cannot be coerced to
a string), that attribute is simply not added to the set:</p>
<div class="highlight"><pre><span></span><code><span class="p">{</span> <span class="si">${</span><span class="k">if</span> foo <span class="k">then</span> <span class="s2">&quot;bar&quot;</span> <span class="k">else</span> <span class="no">null</span><span class="si">}</span> <span class="o">=</span> <span class="no">true</span><span class="p">;</span> <span class="p">}</span>
</code></pre></div>
<p>This will evaluate to <code>{}</code> if <code>foo</code> evaluates to <code>false</code>.</p>
<p>A set that has a <code>__functor</code> attribute whose value is callable (i.e. is
itself a function or a set with a <code>__functor</code> attribute whose value is
callable) can be applied as if it were a function, with the set itself
passed in first , e.g.,</p>
<div class="highlight"><pre><span></span><code><span class="k">let</span> <span class="ss">add</span> <span class="o">=</span> <span class="p">{</span> <span class="ss">__functor</span> <span class="o">=</span> self<span class="p">:</span> x<span class="p">:</span> x <span class="o">+</span> self<span class="o">.</span>x<span class="p">;</span> <span class="p">};</span>
<span class="ss">inc</span> <span class="o">=</span> add <span class="o">//</span> <span class="p">{</span> <span class="ss">x</span> <span class="o">=</span> <span class="mi">1</span><span class="p">;</span> <span class="p">};</span>
<span class="k">in</span> inc <span class="mi">1</span>
</code></pre></div>
<p>evaluates to <code>2</code>. This can be used to attach metadata to a function
without the caller needing to treat it specially, or to implement a form
of object-oriented programming, for example.</p>
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