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// @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;
},
});
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