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99 lines
3.5 KiB
JavaScript
99 lines
3.5 KiB
JavaScript
/* For the Racket manual style */
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AddOnLoad(function() {
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/* Look for header elements that have x-source-module and x-part tag.
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For those elements, add a hidden element that explains how to
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link to the section, and set the element's onclick() to display
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the explanation. */
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var tag_names = ["h1", "h2", "h3", "h4", "h5"];
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for (var j = 0; j < tag_names.length; j++) {
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elems = document.getElementsByTagName(tag_names[j]);
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for (var i = 0; i < elems.length; i++) {
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var elem = elems.item(i);
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AddPartTitleOnClick(elem);
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}
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}
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})
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function AddPartTitleOnClick(elem) {
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var mod_path = elem.getAttribute("x-source-module");
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var tag = elem.getAttribute("x-part-tag");
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if (mod_path && tag) {
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// Might not be present:
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var prefixes = elem.getAttribute("x-part-prefixes");
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var info = document.createElement("div");
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info.className = "RPartExplain";
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/* The "top" tag refers to a whole document: */
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var is_top = (tag == "\"top\"");
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info.appendChild(document.createTextNode("Link to this "
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+ (is_top ? "document" : "section")
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+ " with "));
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/* Break `secref` into two lines if the module path and tag
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are long enough: */
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var is_long = (is_top ? false : ((mod_path.length
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+ tag.length
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+ (prefixes ? (16 + prefixes.length) : 0))
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> 60));
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var line1 = document.createElement("div");
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var line1x = ((is_long && prefixes) ? document.createElement("div") : line1);
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var line2 = (is_long ? document.createElement("div") : line1);
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function add(dest, str, cn) {
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var s = document.createElement("span");
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s.className = cn;
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s.style.whiteSpace = "nowrap";
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s.appendChild(document.createTextNode(str));
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dest.appendChild(s);
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}
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/* Construct a `secref` call with suitable syntax coloring: */
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add(line1, "\xA0@", "RktRdr");
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add(line1, (is_top ? "other-doc" : "secref"), "RktSym");
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add(line1, "[", "RktPn");
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if (!is_top)
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add(line1, tag, "RktVal");
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if (is_long) {
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/* indent additional lines: */
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if (prefixes)
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add(line1x, "\xA0\xA0\xA0\xA0\xA0\xA0\xA0\xA0", "RktPn");
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add(line2, "\xA0\xA0\xA0\xA0\xA0\xA0\xA0\xA0", "RktPn");
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}
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if (prefixes) {
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add(line1x, " #:tag-prefixes ", "RktPn");
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add(line1x, "'", "RktVal");
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add(line1x, prefixes, "RktVal");
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}
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if (!is_top)
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add(line2, " #:doc ", "RktPn");
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add(line2, "'", "RktVal");
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add(line2, mod_path, "RktVal");
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add(line2, "]", "RktPn");
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info.appendChild(line1);
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if (is_long)
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info.appendChild(line1x);
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if (is_long)
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info.appendChild(line2);
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info.style.display = "none";
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/* Add the new element afterthe header: */
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var n = elem.nextSibling;
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if (n)
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elem.parentNode.insertBefore(info, n);
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else
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elem.parentNode.appendChild(info);
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/* Clicking the header shows the explanation element: */
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elem.onclick = function () {
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if (info.style.display == "none")
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info.style.display = "block";
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else
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info.style.display = "none";
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}
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}
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}
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