praetor 0.2.0

A small, strongly typed authorization library for Rust built around composable can and cannot rules.
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144

/* Praetor site — shared behavior
   - highlight.js syntax highlighting
   - copy-to-clipboard on code blocks
   - scrollspy + mobile drawer for the guide sidebar
*/
(function () {
  "use strict";

  // --- syntax highlighting --------------------------------------------------
  if (window.hljs) {
    document.querySelectorAll("pre code").forEach(function (block) {
      window.hljs.highlightElement(block);
    });
  }

  // --- copy to clipboard ----------------------------------------------------
  document.querySelectorAll(".copy-btn").forEach(function (btn) {
    btn.addEventListener("click", function () {
      var block = btn.closest(".codeblock");
      var code = block && block.querySelector("code");
      if (!code) return;
      var text = code.innerText;

      var done = function () {
        btn.textContent = "Copied!";
        btn.classList.add("copied");
        setTimeout(function () {
          btn.textContent = "Copy";
          btn.classList.remove("copied");
        }, 1500);
      };

      if (navigator.clipboard && navigator.clipboard.writeText) {
        navigator.clipboard.writeText(text).then(done).catch(fallback);
      } else {
        fallback();
      }

      function fallback() {
        var ta = document.createElement("textarea");
        ta.value = text;
        ta.style.position = "fixed";
        ta.style.opacity = "0";
        document.body.appendChild(ta);
        ta.select();
        try { document.execCommand("copy"); done(); } catch (e) { /* noop */ }
        document.body.removeChild(ta);
      }
    });
  });

  // --- guide sidebar: scrollspy + mobile drawer -----------------------------
  var toc = document.getElementById("toc");
  if (!toc) return;

  var links = Array.prototype.slice.call(toc.querySelectorAll("a"));
  var sidebar = document.getElementById("sidebar");
  var scrim = document.getElementById("scrim");
  var menuBtn = document.getElementById("menuBtn");

  var byId = {};
  links.forEach(function (a) {
    var id = a.getAttribute("href").slice(1);
    var target = document.getElementById(id);
    if (target) byId[id] = { link: a, section: target };
  });

  // mobile drawer open/close
  function setDrawer(open) {
    if (!sidebar) return;
    sidebar.classList.toggle("open", open);
    if (menuBtn) menuBtn.setAttribute("aria-expanded", open ? "true" : "false");
  }
  if (menuBtn) menuBtn.addEventListener("click", function () {
    setDrawer(!sidebar.classList.contains("open"));
  });
  if (scrim) scrim.addEventListener("click", function () { setDrawer(false); });

  // scrollspy: highlight the section currently in view
  var current = null;
  function setActive(id) {
    if (id === current || !byId[id]) return;
    current = id;
    links.forEach(function (a) { a.classList.remove("active"); });
    byId[id].link.classList.add("active");
  }

  var sections = Object.keys(byId).map(function (id) { return byId[id].section; });

  // the active section is the last one (in document order) whose top has
  // crossed the trigger line. Computing this directly from live layout, and
  // always taking the *last* qualifying section, means a section can't keep
  // winning just because it's tall enough for its tail to still poke past
  // the line while the next section has already started.
  var triggerLine = function () { return window.innerHeight * 0.35; };
  function computeActive() {
    // scrolled to the bottom: the last section may be too short for its top
    // to ever reach the trigger line, so just select it directly
    var doc = document.documentElement;
    if (window.innerHeight + window.scrollY >= doc.scrollHeight - 2) {
      return sections[sections.length - 1].id;
    }
    var line = triggerLine();
    var best = sections[0].id;
    for (var i = 0; i < sections.length; i++) {
      if (sections[i].getBoundingClientRect().top <= line) best = sections[i].id;
    }
    return best;
  }

  // clicking a link jumps straight to its section: select it immediately and
  // hold that choice until the smooth scroll settles, so the spy doesn't
  // read the still-mid-flight scroll position as some other section
  var lockUntil = 0;
  function spyActive() {
    if (Date.now() < lockUntil) return;
    setActive(computeActive());
  }
  links.forEach(function (a) {
    a.addEventListener("click", function () {
      var id = a.getAttribute("href").slice(1);
      if (byId[id]) { setActive(id); lockUntil = Date.now() + 1000; }
      if (window.matchMedia("(max-width: 900px)").matches) setDrawer(false);
    });
  });
  if ("onscrollend" in window) {
    window.addEventListener("scrollend", function () { lockUntil = 0; spyActive(); });
  }

  if ("IntersectionObserver" in window) {
    var observer = new IntersectionObserver(spyActive, { rootMargin: "0px 0px -65% 0px", threshold: [0, 1] });
    sections.forEach(function (s) { observer.observe(s); });
  } else {
    window.addEventListener("scroll", spyActive, { passive: true });
  }
  spyActive();

  // reflect the initial hash, if any
  if (location.hash && byId[location.hash.slice(1)]) {
    setActive(location.hash.slice(1));
  } else if (sections.length) {
    setActive(sections[0].id);
  }
})();