stuff

node_modules/katex/src/functions/overline.ts

@@ -0,0 +1,58 @@
+import defineFunction from "../defineFunction";
+import {makeLineSpan, makeSpan, makeVList} from "../buildCommon";
+import {MathNode, TextNode} from "../mathMLTree";
+
+import * as html from "../buildHTML";
+import * as mml from "../buildMathML";
+
+defineFunction({
+    type: "overline",
+    names: ["\\overline"],
+    props: {
+        numArgs: 1,
+    },
+    handler({parser}, args) {
+        const body = args[0];
+        return {
+            type: "overline",
+            mode: parser.mode,
+            body,
+        };
+    },
+    htmlBuilder(group, options) {
+        // Overlines are handled in the TeXbook pg 443, Rule 9.
+
+        // Build the inner group in the cramped style.
+        const innerGroup = html.buildGroup(group.body,
+            options.havingCrampedStyle());
+
+        // Create the line above the body
+        const line = makeLineSpan("overline-line", options);
+
+        // Generate the vlist, with the appropriate kerns
+        const defaultRuleThickness = options.fontMetrics().defaultRuleThickness;
+        const vlist = makeVList({
+            positionType: "firstBaseline",
+            children: [
+                {type: "elem", elem: innerGroup},
+                {type: "kern", size: 3 * defaultRuleThickness},
+                {type: "elem", elem: line},
+                {type: "kern", size: defaultRuleThickness},
+            ],
+        }, options);
+
+        return makeSpan(["mord", "overline"], [vlist], options);
+    },
+    mathmlBuilder(group, options) {
+        const operator = new MathNode(
+            "mo", [new TextNode("\u203e")]);
+        operator.setAttribute("stretchy", "true");
+
+        const node = new MathNode(
+            "mover",
+            [mml.buildGroup(group.body, options), operator]);
+        node.setAttribute("accent", "true");
+
+        return node;
+    },
+});