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dist/assets/js/enum.js

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+// makes a table of contents
+// top level is h2, goes down from there
+
+let elt_toc   = document.getElementById("toc");
+let elts_enum = document.getElementsByClassName("enum");
+
+// top level is h2
+// if we see a bigger level
+let last_level = 2;
+
+let h2_idx = 0;
+let h3_idx = 0;
+let h4_idx = 0;
+let h5_idx = 0;
+
+// if we see an h2, reset the h3/h4/h5 indexes to 0
+// if we see an h3, reset the h4/h5 indexes to 0
+// so on
+function reset_below(level) {
+    switch(level) {
+        case 2:  h3_idx = 0;
+        case 3:  h4_idx = 0;
+        case 4:  h5_idx = 0;
+        default: break;
+    }
+}
+
+// str index; e.g. "1.3.4"
+function str_idx(level) {
+    // build up components in reverse
+    // so an h4 shouldn't have any h5 data
+    let components = [];
+    switch(level) {
+        case 5: components.push(h5_idx);
+        case 4: components.push(h4_idx);
+        case 3: components.push(h3_idx);
+        case 2: components.push(h2_idx);
+        default: break;
+    }
+    components.reverse();
+    return components.join(".");
+}
+
+// when we see a new element, increment the index
+function incr(level) {
+    switch(level) {
+        case 2:  h2_idx += 1; break;
+        case 3:  h3_idx += 1; break;
+        case 4:  h4_idx += 1; break;
+        case 5:  h5_idx += 1; break;
+        default: break;
+    }
+}
+
+for (let this_enum_elt of elts_enum)
+{
+    switch(this_enum_elt.tagName) {
+        case "H2": this_level = 2; break;
+        case "H3": this_level = 3; break;
+        case "H4": this_level = 4; break;
+        case "H5": this_level = 5; break;
+        default:   this_level = 0;
+    }
+
+    //console.log(this_enum_elt);
+
+    // increment index, reset those below
+    // so if we see an h2, bump up the h2 index, reset h3/h4/h5 to 0
+    reset_below(this_level);
+    incr(this_level);
+
+    // "Foo Bar" -> "1.3.4. Foo Bar"
+    let old_section_title = this_enum_elt.innerText;
+    let new_section_title = str_idx(this_level) + ". " + this_enum_elt.innerText;
+
+    this_enum_elt.innerText = new_section_title;
+
+    //console.log(new_section_title);
+    let entry_a = document.createElement('a');
+
+    // make an id for this entry if it doesn't exist
+    if (!this_enum_elt.id) {
+        // "Foo Bar" -> "foo-bar"
+        let words = old_section_title.split(" ");
+        let ident = words.map(function (s) { return s.toLowerCase(); }).join("-");
+        this_enum_elt.id = ident;
+    }
+
+    entry_a.href = "#" + this_enum_elt.id;
+    entry_a.innerText = new_section_title;
+    entry_a.classList += "toc" + this_level;
+
+    //console.log(entry_a);
+    let entry_br = document.createElement('br');
+
+    toc.appendChild(entry_a);
+    toc.appendChild(entry_br);
+}