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185 lines
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185 lines
8.5 KiB
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</header>
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<div class="page-header">
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<h1>HTML/XML pretty printer and viewer</h1>
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</div>
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<div class="row">
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<div class="col-md-9">
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<p>This uses the <code>vkbeautify</code> and <code>highlight.js</code> javascript modules to format and
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"pretty print" HTML/XML documents, nodes, node sets and plain character
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HTML/XML in an <code>htmlwidget</code> pane.</p>
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<pre><span class='fu'>xml_view</span>(<span class='no'>doc</span>, <span class='kw'>style</span> <span class='kw'>=</span> <span class='st'>"default"</span>, <span class='kw'>scroll</span> <span class='kw'>=</span> <span class='fl'>FALSE</span>, <span class='kw'>add_filter</span> <span class='kw'>=</span> <span class='fl'>FALSE</span>,
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<span class='kw'>apply_xpath</span> <span class='kw'>=</span> <span class='kw'>NULL</span>, <span class='kw'>elementId</span> <span class='kw'>=</span> <span class='kw'>NULL</span>, <span class='kw'>width</span> <span class='kw'>=</span> <span class='st'>"100%"</span>, <span class='kw'>height</span> <span class='kw'>=</span> <span class='kw'>NULL</span>)
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<span class='fu'>html_view</span>(<span class='no'>doc</span>, <span class='kw'>style</span> <span class='kw'>=</span> <span class='st'>"default"</span>, <span class='kw'>scroll</span> <span class='kw'>=</span> <span class='fl'>FALSE</span>, <span class='kw'>add_filter</span> <span class='kw'>=</span> <span class='fl'>FALSE</span>,
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<span class='kw'>apply_xpath</span> <span class='kw'>=</span> <span class='kw'>NULL</span>, <span class='kw'>elementId</span> <span class='kw'>=</span> <span class='kw'>NULL</span>, <span class='kw'>width</span> <span class='kw'>=</span> <span class='st'>"100%"</span>, <span class='kw'>height</span> <span class='kw'>=</span> <span class='kw'>NULL</span>)</pre>
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<h2>Arguments</h2>
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<dl class="dl-horizontal">
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<dt>doc</dt>
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<dd><code>xml2</code> document/node/nodeset, an <code>HTMLInternalDocument</code>/
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<code>XMLInternalDocument</code> or atomic character vector of HTML/XML content</dd>
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<dt>style</dt>
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<dd>CSS stylesheet to use (see <code>higlight_styles()</code>)</dd>
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<dt>scroll</dt>
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<dd>should the <code><div></code> holding the HTML/XML content scroll
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(<code>TRUE</code>) or take up the full viewer/browser window (<code>FALSE</code>).
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Default is <code>FALSE</code> (take up the full viewer/browser window). If
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this is set to <code>TRUE</code>, <code>height</code> should be set to a value
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other than <code>NULL</code>.</dd>
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<dt>add_filter</dt>
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<dd>show an XPath input box to enable live filtering?
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(default: <code>FALSE</code>)</dd>
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<dt>apply_xpath</dt>
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<dd>Add and apply an XPath query string to the view. If
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<code>add_filter</code> is <code>TRUE</code> then this query string will
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appear in the filter box and be applied to the passed in document.</dd>
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<dt>elementId</dt>
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<dd>element id</dd>
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<dt>width</dt>
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<dd>widget width (best to keep it at 100%)</dd>
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<dt>height</dt>
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<dd>widget height (kinda only useful for knitting since this is
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meant to be an interactive tool).</dd>
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</dl>
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<div class="Note">
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<h2>Note</h2>
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<p>Large HTML or XML content may take some time to render properly. It is suggested
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that this function be used on as minimal of a subset of HTML/XML as possible
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or used in a browser context vs an IDE viewer context.</p>
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</div>
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<div class="References">
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<h2>References</h2>
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<p><a href = 'highlight.js'>https://highlightjs.org/</a>,
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<a href = 'vkbeautify'>http://www.eslinstructor.net/vkbeautify/</a></p>
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</div>
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<h2 id="examples">Examples</h2>
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<pre class="examples"><div class='input'><span class='co'>## Not run: ------------------------------------</span>
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<span class='co'># library(xml2)</span>
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<span class='co'># </span>
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<span class='co'># # plain text</span>
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<span class='co'># txt <- paste0("<note><to>Tove</to><from>Jani</from><heading>Reminder</heading>",</span>
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<span class='co'># "<body>Don't forget me this weekend!</body></note>")</span>
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<span class='co'># xml_view(txt)</span>
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<span class='co'># </span>
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<span class='co'># # xml object</span>
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<span class='co'># doc <- read_xml(txt)</span>
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<span class='co'># xml_view(doc, style="obsidian")</span>
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<span class='co'># </span>
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<span class='co'># # different style</span>
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<span class='co'># xml_view(xml_find_all(doc, ".//to"), style="github-gist")</span>
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<span class='co'># </span>
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<span class='co'># # some more complex daata</span>
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<span class='co'># xml_view(read_xml(system.file("extdata/dwml.xml", package="htmltidy")))</span>
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<span class='co'># xml_view(read_xml(system.file("extdata/getHistory.xml", package="htmltidy")),</span>
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<span class='co'># "androidstudio")</span>
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<span class='co'># xml_view(read_xml(system.file("extdata/input.xml", package="htmltidy")),</span>
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<span class='co'># "sunburst")</span>
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<span class='co'># </span>
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<span class='co'># # filter + apply an initial XPath query string</span>
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<span class='co'># xml_view(read_xml(system.file("extdata/dwml.xml", package="xmlview")),</span>
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<span class='co'># add_filter=TRUE, apply_xpath=".//temperature")</span>
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<span class='co'># </span>
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<span class='co'># doc <- read_xml("http://www.npr.org/rss/rss.php?id=1001")</span>
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<span class='co'># </span>
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<span class='co'># str(doc)</span>
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<span class='co'># </span>
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<span class='co'># xml_view(doc, add_filter=TRUE)</span>
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<span class='co'># xml2::xml_find_all(doc, './/dc:creator', ns=xml2::xml_ns(doc))</span>
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<span class='co'># </span>
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<span class='co'># xml_text(xml2::xml_find_all(doc, './/link[contains(., "soccer")]', ns=xml2::xml_ns(doc)))</span>
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<span class='co'>## ---------------------------------------------</span></div></pre>
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