457 lines
17 KiB
HTML
457 lines
17 KiB
HTML
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</head>
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<body>
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<h1 class="title toc-ignore">Printing a tibble: Tracking control
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flow</h1>
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<p>What happens when a tibble is printed? This vignette shows the actual
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control flow, powered by the <a href="https://github.com/r-lib/debugme#readme">debugme package</a>. See
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<code>vignette("printing")</code> for a detailed description of the
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control and data flows.</p>
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<p>To activate debugging, we need to set an environment variable before
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loading the pillar package. As a result, debug strings in pillar’s code
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are replaced with calls to a logging function.</p>
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<p>By default, debugme also shows timestamps. This is disabled to keep
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the output stable.</p>
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<div class="sourceCode" id="cb1"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb1-1"><a href="#cb1-1" tabindex="-1"></a><span class="fu">Sys.setenv</span>(<span class="at">DEBUGME =</span> <span class="st">"!!!!pillar"</span>)</span>
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<span id="cb1-2"><a href="#cb1-2" tabindex="-1"></a><span class="fu">Sys.setenv</span>(<span class="at">DEBUGME_SHOW_TIMESTAMP =</span> <span class="st">"no"</span>)</span>
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<span id="cb1-3"><a href="#cb1-3" tabindex="-1"></a></span>
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<span id="cb1-4"><a href="#cb1-4" tabindex="-1"></a><span class="fu">library</span>(pillar)</span>
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<span id="cb1-5"><a href="#cb1-5" tabindex="-1"></a></span>
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<span id="cb1-6"><a href="#cb1-6" tabindex="-1"></a>tbl <span class="ot"><-</span> tibble<span class="sc">::</span><span class="fu">tibble</span>(<span class="at">a =</span> <span class="dv">1</span><span class="sc">:</span><span class="dv">3</span>, <span class="at">b =</span> tibble<span class="sc">::</span><span class="fu">tibble</span>(<span class="at">c =</span> <span class="dv">4</span><span class="sc">:</span><span class="dv">6</span>, <span class="at">d =</span> <span class="dv">7</span><span class="sc">:</span><span class="dv">9</span>), <span class="at">e =</span> <span class="dv">10</span><span class="sc">:</span><span class="dv">12</span>)</span>
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<span id="cb1-7"><a href="#cb1-7" tabindex="-1"></a><span class="fu">print</span>(tbl, <span class="at">width =</span> <span class="dv">23</span>)</span></code></pre></div>
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<pre><code>#> #> pillar tbl_format_setup()
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#> #> pillar +-tbl_format_setup.tbl()
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#> #> pillar +-ctl_colonnade()
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#> #> pillar +-ctl_new_compound_pillar(width = 21, title = "a")
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#> #> pillar +-ctl_new_compound_pillar.tbl(width = 21, title = "a")
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#> #> pillar +-ctl_new_pillar(width = 21, title = "a")
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#> #> pillar +-ctl_new_pillar.tbl(width = 21, title = "a")
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#> #> pillar +-pillar(title = "a", width = 21)
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#> #> pillar +-new_pillar_title(x = "a")
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#> #> pillar +-new_pillar_type(class(x) = "integer")
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#> #> pillar +-pillar_shaft(class(x) = "integer")
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#> #> pillar +-new_pillar_component(x = <list: <pllr_sh_>>, width = 1L, min_width = 1L)
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#> #> pillar +-new_pillar(width = 21, class = NULL)
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#> #> pillar +-new_pillar_component(x = <list: <pllr_ttl>>, width = 1L, min_width = 1L)
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#> #> pillar +-new_pillar_component(x = <list: <pllr_typ>>, width = 5L, min_width = 5L)
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#> #> pillar +-ctl_new_compound_pillar(width = 15, title = "b")
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#> #> pillar +-ctl_new_compound_pillar.tbl(width = 15, title = "b")
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#> #> pillar +-ctl_new_compound_pillar(width = 15, title = <chr: "b$", "c">)
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#> #> pillar +-ctl_new_compound_pillar.tbl(width = 15, title = <chr: "b$", "c">)
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#> #> pillar +-ctl_new_pillar(width = 15, title = "b$c")
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#> #> pillar +-ctl_new_pillar.tbl(width = 15, title = "b$c")
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#> #> pillar +-pillar(title = "b$c", width = 15)
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#> #> pillar +-new_pillar_title(x = "b$c")
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#> #> pillar +-new_pillar_type(class(x) = "integer")
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#> #> pillar +-pillar_shaft(class(x) = "integer")
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#> #> pillar +-new_pillar_component(x = <list: <pllr_sh_>>, width = 1L, min_width = 1L)
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#> #> pillar +-new_pillar(width = 15, class = NULL)
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#> #> pillar +-new_pillar_component(x = <list: <pllr_ttl>>, width = 3L, min_width = 3L)
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#> #> pillar +-new_pillar_component(x = <list: <pllr_typ>>, width = 5L, min_width = 5L)
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#> #> pillar +-ctl_new_compound_pillar(width = 9, title = <chr: "$", "d">)
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#> #> pillar +-ctl_new_compound_pillar.tbl(width = 9, title = <chr: "$", "d">)
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#> #> pillar +-ctl_new_pillar(width = 9, title = "$d")
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#> #> pillar +-ctl_new_pillar.tbl(width = 9, title = "$d")
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#> #> pillar +-pillar(title = "$d", width = 9)
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#> #> pillar +-new_pillar_title(x = "$d")
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#> #> pillar +-new_pillar_type(class(x) = "integer")
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#> #> pillar +-pillar_shaft(class(x) = "integer")
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#> #> pillar +-new_pillar_component(x = <list: <pllr_sh_>>, width = 1L, min_width = 1L)
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#> #> pillar +-new_pillar(width = 9, class = NULL)
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#> #> pillar +-new_pillar_component(x = <list: <pllr_ttl>>, width = 2L, min_width = 2L)
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#> #> pillar +-new_pillar_component(x = <list: <pllr_typ>>, width = 5L, min_width = 5L)
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#> #> pillar +-new_pillar_component(x = <list: <pllr_ttl>, <pllr_ttl>>, width = <int: 3L, 2L>, min_width = <int: 3L, 2L>)
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#> #> pillar +-new_pillar_component(x = <list: <pllr_typ>, <pllr_typ>>, width = <int: 5L, 5L>, min_width = <int: 5L, 5L>)
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#> #> pillar +-new_pillar_component(x = <list: <pllr_sh_>, <pllr_sh_>>, width = <int: 1L, 1L>, min_width = <int: 1L, 1L>)
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#> #> pillar +-new_pillar(width = NULL, class = "compound_pillar")
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#> #> pillar +-ctl_new_compound_pillar(width = 3, title = "e")
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#> #> pillar +-ctl_new_compound_pillar.tbl(width = 3, title = "e")
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#> #> pillar +-ctl_new_pillar(width = 3, title = "e")
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#> #> pillar +-ctl_new_pillar.tbl(width = 3, title = "e")
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#> #> pillar +-pillar(title = "e", width = 3)
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#> #> pillar +-new_pillar_title(x = "e")
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#> #> pillar +-new_pillar_type(class(x) = "integer")
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#> #> pillar +-new_pillar_component(x = <list: <pllr_ttl>, <pllr_ttl>, <pllr_ttl>>, width = <int: 1L, 3L, 2L>, min_width = <int: 1L, 3L, 2L>)
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#> #> pillar +-new_pillar_component(x = <list: <pllr_typ>, <pllr_typ>, <pllr_typ>>, width = <int: 5L, 5L, 5L>, min_width = <int: 5L, 5L, 5L>)
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#> #> pillar +-new_pillar_component(x = <list: <pllr_sh_>, <pllr_sh_>, <pllr_sh_>>, width = <int: 1L, 1L, 1L>, min_width = <int: 1L, 1L, 1L>)
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#> #> pillar +-new_pillar(width = NULL, class = "compound_pillar")
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#> #> pillar +-new_pillar(width = NULL, class = NULL)
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#> #> pillar +-new_pillar_component(x = <list: <pllr_ttl>>, width = 1L, min_width = 1L)
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#> #> pillar +-new_pillar_component(x = <list: <pllr_typ>>, width = 5L, min_width = 5L)
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#> #> pillar +-new_pillar_component(x = <list: <pllr_sh_>>, width = 1L, min_width = 1L)
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#> #> pillar +-new_pillar(width = NULL, class = NULL)
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#> #> pillar +-new_pillar_component(x = <list: <pllr_ttl>>, width = 3L, min_width = 3L)
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#> #> pillar +-new_pillar_component(x = <list: <pllr_typ>>, width = 5L, min_width = 5L)
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#> #> pillar +-new_pillar_component(x = <list: <pllr_sh_>>, width = 1L, min_width = 1L)
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#> #> pillar +-new_pillar(width = NULL, class = NULL)
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#> #> pillar +-new_pillar_component(x = <list: <pllr_ttl>>, width = 2L, min_width = 2L)
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#> #> pillar +-new_pillar_component(x = <list: <pllr_typ>>, width = 5L, min_width = 5L)
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#> #> pillar +-new_pillar_component(x = <list: <pllr_sh_>>, width = 1L, min_width = 1L)
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#> #> pillar +-new_pillar_component(x = <list: <pllr_rf_>>, width = 1L, min_width = 1L)
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#> #> pillar +-new_pillar_component(x = <list: <pllr_rf_>>, width = 1L, min_width = 1L)
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#> #> pillar +-new_pillar(width = NULL, class = NULL)
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#> #> # A tibble: 3 x 3
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#> #> a b$c $d
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#> #> <int> <int> <int>
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#> #> 1 1 4 7
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#> #> 2 2 5 8
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||
#> #> 3 3 6 9
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#> #> # … with 1 more
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#> #> # variable: e <int></code></pre>
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