<html devsite>
<head>
  <meta name="project_path" value="/_project.yaml">
  <meta name="book_path" value="/versions/7.1.0/_book.yaml">
</head>
<body>

<h1 class="page-title" id="modules.Label">Label</h1>

{% dynamic setvar source_file "src/main/java/com/google/devtools/build/lib/cmdline/Label.java" %}
{% dynamic setvar version "7.1.0" %}
{% dynamic setvar original_path "/rules/lib/builtins/Label" %}
{% include "_buttons.html" %}
<!-- {% raw %} -->

A BUILD target identifier.<p>For every <code>Label</code> instance <code>l</code>, the string representation <code>str(l)</code> has the property that <code>Label(str(l)) == l</code>, regardless of where the <code>Label()</code> call occurs.

<h2>Members</h2>
<ul>
    <li>
    <a href="#Label">Label</a>
  </li>
      <li>
    <a href="#name">name</a>
  </li>
      <li>
    <a href="#package">package</a>
  </li>
      <li>
    <a href="#relative">relative</a>
  </li>
      <li>
    <a href="#repo_name">repo_name</a>
  </li>
      <li>
    <a href="#same_package_label">same_package_label</a>
  </li>
      <li>
    <a href="#workspace_name">workspace_name</a>
  </li>
      <li>
    <a href="#workspace_root">workspace_root</a>
  </li>
  </ul>

      <h2 id="Label">Label</h2>
        <p><pre class="rule-signature"><a class="anchor" href="../builtins/Label.html">Label</a> Label(input)</pre></p>

    Converts a label string into a <code>Label</code> object, in the context of the package where the calling <code>.bzl</code> source file lives. If the given value is already a <code>Label</code>, it is returned unchanged.<p>For macros, a related function, <code><a href='../toplevel/native.html#package_relative_label'>native.package_relative_label()</a></code>, converts the input into a <code>Label</code> in the context of the package currently being constructed. Use that function to mimic the string-to-label conversion that is automatically done by label-valued rule attributes.

          <!-- hide-from-toc is a class used by DevSite for the public Bazel site
      (https://developers.google.com/devsite/reference/styles/headings#hide_headings_from_the_toc) -->
      <h3 class="hide-from-toc">Parameters</h3>
      <table class="table table-bordered table-condensed table-params">
        <colgroup>
          <col class="col-param">
          <col class="param-description">
        </colgroup>
        <thead>
          <tr>
            <th>Parameter</th>
            <th>Description</th>
          </tr>
        </thead>
        <tbody>
                  <tr>
            <td id="Label.input">
              <code>input</code>
            </td>
            <td>
                          <a class="anchor" href="../core/string.html">string</a>; or <a class="anchor" href="../builtins/Label.html">Label</a>;
                                     required<br/>
                          The input label string or Label object. If a Label object is passed, it's returned as is.
            </td>
          </tr>
                </tbody>
      </table>

        <h2 id="name">name</h2>
        <p><pre class="rule-signature"><a class="anchor" href="../core/string.html">string</a> Label.name</pre></p>

    The name of the target referred to by this label. For instance:<br><pre class=language-python>Label("@@foo//pkg/foo:abc").name == "abc"</pre>


        <h2 id="package">package</h2>
        <p><pre class="rule-signature"><a class="anchor" href="../core/string.html">string</a> Label.package</pre></p>

    The name of the package containing the target referred to by this label, without the repository name. For instance:<br><pre class=language-python>Label("@@repo//pkg/foo:abc").package == "pkg/foo"</pre>


        <h2 id="relative">relative</h2>
        <p><pre class="rule-signature"><a class="anchor" href="../builtins/Label.html">Label</a> Label.relative(relName)</pre></p>

    <b>Experimental</b>. This API is experimental and may change at any time. Please do not depend on it. It may be enabled on an experimental basis by setting <code>--+incompatible_enable_deprecated_label_apis</code> <br><strong>Deprecated.</strong> This method behaves surprisingly when used with an argument containing an apparent repo name. Prefer <a href="#local_target_label"><code>Label.same_package_label()</code></a>, <a href="../toplevel/native#package_relative_label"><code>native.package_relative_label()</code></a>, or <a href="#Label"><code>Label()</code></a> instead.<p>Resolves a label that is either absolute (starts with <code>//</code>) or relative to the current package. If this label is in a remote repository, the argument will be resolved relative to that repository. If the argument contains a repository name, the current label is ignored and the argument is returned as-is, except that the repository name is rewritten if it is in the current repository mapping. Reserved labels will also be returned as-is.<br>For example:<br><pre class=language-python>
Label("//foo/bar:baz").relative(":quux") == Label("//foo/bar:quux")
Label("//foo/bar:baz").relative("//wiz:quux") == Label("//wiz:quux")
Label("@repo//foo/bar:baz").relative("//wiz:quux") == Label("@repo//wiz:quux")
Label("@repo//foo/bar:baz").relative("//visibility:public") == Label("//visibility:public")
Label("@repo//foo/bar:baz").relative("@other//wiz:quux") == Label("@other//wiz:quux")
</pre><p>If the repository mapping passed in is <code>{'@other' : '@remapped'}</code>, then the following remapping will take place:<br><pre class=language-python>
Label("@repo//foo/bar:baz").relative("@other//wiz:quux") == Label("@remapped//wiz:quux")
</pre>

          <!-- hide-from-toc is a class used by DevSite for the public Bazel site
      (https://developers.google.com/devsite/reference/styles/headings#hide_headings_from_the_toc) -->
      <h3 class="hide-from-toc">Parameters</h3>
      <table class="table table-bordered table-condensed table-params">
        <colgroup>
          <col class="col-param">
          <col class="param-description">
        </colgroup>
        <thead>
          <tr>
            <th>Parameter</th>
            <th>Description</th>
          </tr>
        </thead>
        <tbody>
                  <tr>
            <td id="relative.relName">
              <code>relName</code>
            </td>
            <td>
                                     required<br/>
                          The label that will be resolved relative to this one.
            </td>
          </tr>
                </tbody>
      </table>

        <h2 id="repo_name">repo_name</h2>
        <p><pre class="rule-signature"><a class="anchor" href="../core/string.html">string</a> Label.repo_name</pre></p>

    The canonical name of the repository containing the target referred to by this label, without any leading at-signs (<code>@</code>). For instance, <pre class=language-python>Label("@@foo//bar:baz").repo_name == "foo"</pre>


        <h2 id="same_package_label">same_package_label</h2>
        <p><pre class="rule-signature"><a class="anchor" href="../builtins/Label.html">Label</a> Label.same_package_label(target_name)</pre></p>

    Creates a label in the same package as this label with the given target name.

          <!-- hide-from-toc is a class used by DevSite for the public Bazel site
      (https://developers.google.com/devsite/reference/styles/headings#hide_headings_from_the_toc) -->
      <h3 class="hide-from-toc">Parameters</h3>
      <table class="table table-bordered table-condensed table-params">
        <colgroup>
          <col class="col-param">
          <col class="param-description">
        </colgroup>
        <thead>
          <tr>
            <th>Parameter</th>
            <th>Description</th>
          </tr>
        </thead>
        <tbody>
                  <tr>
            <td id="same_package_label.target_name">
              <code>target_name</code>
            </td>
            <td>
                                     required<br/>
                          The target name of the new label.
            </td>
          </tr>
                </tbody>
      </table>

        <h2 id="workspace_name">workspace_name</h2>
        <p><pre class="rule-signature"><a class="anchor" href="../core/string.html">string</a> Label.workspace_name</pre></p>

    <b>Experimental</b>. This API is experimental and may change at any time. Please do not depend on it. It may be enabled on an experimental basis by setting <code>--+incompatible_enable_deprecated_label_apis</code> <br><strong>Deprecated.</strong> The field name "workspace name" is a misnomer here; use the identically-behaving <a href="#repo_name"><code>Label.repo_name</code></a> instead.<p>The canonical name of the repository containing the target referred to by this label, without any leading at-signs (<code>@</code>). For instance, <pre class=language-python>Label("@@foo//bar:baz").workspace_name == "foo"</pre>


        <h2 id="workspace_root">workspace_root</h2>
        <p><pre class="rule-signature"><a class="anchor" href="../core/string.html">string</a> Label.workspace_root</pre></p>

    Returns the execution root for the repository containing the target referred to by this label, relative to the execroot. For instance:<br><pre class=language-python>Label("@repo//pkg/foo:abc").workspace_root == "external/repo"</pre>



</body>
</html>

<!-- {% endraw %} -->
