Commit node_modules

paige/node_modules/katex/src/functions/underline.js

@@ -0,0 +1,58 @@
+// @flow
+import defineFunction from "../defineFunction";
+import buildCommon from "../buildCommon";
+import mathMLTree from "../mathMLTree";
+
+import * as html from "../buildHTML";
+import * as mml from "../buildMathML";
+
+defineFunction({
+    type: "underline",
+    names: ["\\underline"],
+    props: {
+        numArgs: 1,
+        allowedInText: true,
+    },
+    handler({parser}, args) {
+        return {
+            type: "underline",
+            mode: parser.mode,
+            body: args[0],
+        };
+    },
+    htmlBuilder(group, options) {
+        // Underlines are handled in the TeXbook pg 443, Rule 10.
+        // Build the inner group.
+        const innerGroup = html.buildGroup(group.body, options);
+
+        // Create the line to go below the body
+        const line = buildCommon.makeLineSpan("underline-line", options);
+
+        // Generate the vlist, with the appropriate kerns
+        const defaultRuleThickness = options.fontMetrics().defaultRuleThickness;
+        const vlist = buildCommon.makeVList({
+            positionType: "top",
+            positionData: innerGroup.height,
+            children: [
+                {type: "kern", size: defaultRuleThickness},
+                {type: "elem", elem: line},
+                {type: "kern", size: 3 * defaultRuleThickness},
+                {type: "elem", elem: innerGroup},
+            ],
+        }, options);
+
+        return buildCommon.makeSpan(["mord", "underline"], [vlist], options);
+    },
+    mathmlBuilder(group, options) {
+        const operator = new mathMLTree.MathNode(
+            "mo", [new mathMLTree.TextNode("\u203e")]);
+        operator.setAttribute("stretchy", "true");
+
+        const node = new mathMLTree.MathNode(
+            "munder",
+            [mml.buildGroup(group.body, options), operator]);
+        node.setAttribute("accentunder", "true");
+
+        return node;
+    },
+});